Radiation device, powder spreading device, 3D printing equipment and control method and device thereof

Abstract

The present application discloses a radiation device, a powder spreading device, a 3D printing device, and a control method and device thereof. Among them, the radiation device includes a moving mechanism and a plurality of arranged energy beam emitters. The moving mechanism is used to move along the printing surface of the 3D printing device; the plurality of arranged energy beam emitters are integrally arranged on the moving mechanism, and are used to selectively radiate the powder material spread in the gap between the component platform and the printing surface of the 3D printing device according to the acquired cross-sectional image during the movement along the printing surface, so as to form a cross-sectional layer corresponding to the cross-sectional image. The present application significantly improves the printing efficiency by means of multi-point scanning, line scanning or surface projection, and the powder spreading device in the present application can integrate powder spreading, preheating and energy radiation into one, and can complete the printing of a cross-sectional layer in the process of moving along the printing surface from one side to the other, thereby effectively improving the printing efficiency.

Description

Technical Field

[0001] The present application relates to 3D printing technology, and in particular to a radiation device, a powder spreading device, a 3D printing system, a 3D printing device, and a control device, method and storage medium thereof. Background Art

[0002] In some implementations, current SLS printing equipment uses a point laser method. According to the pre-planned scanning path, the galvanometer is adjusted to realize the laser from point to line and from line to surface in the focused radiation range, completing the scanning and forming of each layer of 3D printing graphics. After scanning one layer, a scraper is used to spread the powder, and then the powder is preheated by a heating device before scanning the next layer. However, this point-by-point scanning method has low scanning efficiency, which affects the efficiency of workpiece production. Secondly, the need to spread the powder and preheat each layer after scanning also increases the workpiece production time, affecting the efficiency of 3D printing. Summary of the invention

[0003] In view of the shortcomings of the above-mentioned related technologies, the purpose of the present application is to provide a radiation device, a powder spreading device, a 3D printing system, a 3D printing device and its control device, method and storage medium, which are used to solve the technical problems of long printing time and low efficiency of 3D printing equipment.

[0004] To achieve the above-mentioned purpose and other related purposes, the first aspect of the present application provides a radiation device for a 3D printing device, comprising: a moving mechanism for moving along a printing surface of the 3D printing device; a plurality of arranged energy beam emitters, which are integrally arranged on the moving mechanism, and are used to selectively radiate a powder material laid in a gap between a component platform and the printing surface of the 3D printing device according to an acquired cross-sectional image during movement along the printing surface, so as to form a cross-sectional layer corresponding to the cross-sectional image.

[0005] In certain embodiments of the first aspect of the present application, the energy beam emitters are arranged in a line or in a planar array.

[0006] In certain embodiments of the first aspect of the present application, the surface array includes: a dot matrix surface array formed according to the moving direction, or a dot matrix surface array formed according to the moving direction.

[0007] In certain embodiments of the first aspect of the present application, the first radiation range of the radiation device covers the printing width / printing length of the printing surface.

[0008] In certain embodiments of the first aspect of the present application, the energy beam emitter includes a laser emission terminal and a galvanometer; wherein, during movement, each galvanometer adjusts the angle of the energy beam emitted by the laser emission terminal according to the instantaneous position of the corresponding laser emission terminal.

[0009] In certain embodiments of the first aspect of the present application, the energy beam emitters are arranged at intervals according to their respective second radiation ranges.

[0010] In certain embodiments of the first aspect of the present application, the second radiation range includes: a range scanned by a corresponding energy beam emitter, or a range of an energy beam emitted by a corresponding energy beam emitter.

[0011] In certain embodiments of the first aspect of the present application, during movement, each of the energy beam emitters adjusts the irradiated angle to radiate energy according to the correspondence between the instantaneous position of the movement and the pixel position in the cross-sectional image.

[0012] In certain embodiments of the first aspect of the present application, a cross-sectional layer perpendicular to the moving direction is manufactured by adjusting the radiation angle of each energy beam emitter.

[0013] In certain embodiments of the first aspect of the present application, during the movement, each of the energy beam emitters selectively radiates energy based on the correspondence between the instantaneous position of the movement and the pixel position of the cross-sectional image.

[0014] In certain embodiments of the first aspect of the present application, a cross-sectional layer perpendicular to the moving direction is manufactured by selective energy radiation from each of the energy beam emitters.

[0015] In certain embodiments of the first aspect of the present application, the energy radiated by the energy beam emitter is light energy.

[0016] In certain embodiments of the first aspect of the present application, an energy source connected to each energy beam emitter is also included.

[0017] A second aspect of the present application provides a powder spreading device for a 3D printing device, the powder spreading device comprising: a radiation device as described in any one of the embodiments of the first aspect of the present application; and a scraper mechanism, which is arranged on a moving mechanism of the radiation device and moves as a whole with the arranged multiple energy beam emitters, and is used to spread powder material in the gap between the component platform and the printing surface of the 3D printing device.

[0018] In certain embodiments of the second aspect of the present application, a preheating device is further included, which is arranged on the moving mechanism of the radiation device and is used to preheat the laid powder material so that the multiple arranged energy beam emitters can radiate the preheated powder material in the gap.

[0019] In certain embodiments of the second aspect of the present application, the preheating device is symmetrically arranged on both sides of the scraper mechanism; during the movement, the preheating device following one side of the scraper mechanism performs the preheating operation.

[0020] In certain embodiments of the second aspect of the present application, the radiation device is symmetrically arranged on both sides of the scraper mechanism; during movement, a plurality of energy beam emitters arranged to follow one side of the scraper mechanism perform radiation operations.

[0021] The third aspect of the present application provides a 3D printing device for manufacturing a three-dimensional object using powder material, wherein the 3D printing device includes: a component platform for carrying the three-dimensional object manufactured layer by layer; a Z-axis moving mechanism for driving the component platform to move so that the gap between the component platform and the printing surface is filled with powder material; a feeding device, arranged on at least one side of the component platform, for providing powder material for manufacturing the cross-sectional layer of the three-dimensional object; and a powder spreading device as described in any one of the embodiments of the second aspect of the present application.

[0022] In certain embodiments of the third aspect of the present application, the feeding device is symmetrically arranged on both sides of the component platform.

[0023] In certain embodiments of the third aspect of the present application, a molding cavity is further included, wherein the component platform moves in the molding cavity.

[0024] A fourth aspect of the present application provides a control method for a 3D printing device, the 3D printing device comprising: a Z-axis moving mechanism equipped with a component platform, a feeding device, a scraper mechanism, and a radiation device, the control method comprising: controlling the Z-axis moving mechanism to move so that there is a gap between the component platform and the printing surface of the 3D printing device; controlling the feeding device to replenish powder material; controlling the moving mechanism in the radiation device to move the multiple energy beam emitters and the scraper mechanism arranged along the printing surface as a whole, so that during the movement, the scraper mechanism lays the replenished powder material in the gap; during the movement, controlling the multiple energy beam emitters arranged to selectively radiate the laid powder material according to the acquired cross-sectional image to form a cross-sectional layer corresponding to the cross-sectional image; sequentially acquiring the order of each cross-sectional image of the three-dimensional object model, and repeating the above steps to manufacture the corresponding three-dimensional object layer by layer.

[0025] In certain embodiments of the fourth aspect of the present application, the 3D printing device also includes a preheating device that moves as a whole with the scraper mechanism, and the control method also includes: controlling the preheating device to preheat the laid powder material for selective radiation treatment by the arranged multiple energy beam emitters.

[0026] In certain embodiments of the fourth aspect of the present application, the first radiation range of the radiation device covers the printing width / printing length of the printing surface.

[0027] In certain embodiments of the fourth aspect of the present application, the step of controlling the arranged multiple energy beam emitters to selectively irradiate the laid powder material according to the acquired cross-sectional image includes: each of the energy beam emitters adjusts the irradiated angle to perform energy radiation based on the correspondence between the instantaneous position of the movement and the pixel position in the cross-sectional image.

[0028] In certain embodiments of the fourth aspect of the present application, a cross-sectional layer perpendicular to the moving direction is manufactured by adjusting the radiation angle of each of the energy beam emitters.

[0029] In certain embodiments of the fourth aspect of the present application, the step of controlling the arranged multiple energy beam emitters to selectively irradiate the laid powder material according to the acquired cross-sectional image includes: during movement, each of the energy beam emitters selectively radiates energy based on the correspondence between the instantaneous position of the movement and the pixel position of the cross-sectional image.

[0030] In certain embodiments of the fourth aspect of the present application, a cross-sectional layer perpendicular to the moving direction is manufactured by selective energy radiation from each of the energy beam emitters.

[0031] In certain embodiments of the fourth aspect of the present application, the energy beam emitters are arranged at intervals according to their respective second radiation ranges.

[0032] In certain embodiments of the fourth aspect of the present application, the second radiation range includes: a range scanned by a corresponding energy beam emitter, or a range of an energy beam emitted by a corresponding energy beam emitter.

[0033] In a fifth aspect, the present application provides a control device for a 3D printing device, comprising: an interface unit for data connection with a Z-axis moving mechanism, a feeding device, a scraper mechanism, and a radiation device in the 3D printing device; a storage unit for storing at least one program; and a processing unit for calling the at least one program to coordinate the storage unit and the interface unit to implement a control method as described in any one of the embodiments of the fourth aspect of the present application.

[0034] A sixth aspect of the present application provides a 3D printing system, comprising: a 3D printing device as described in any one of the embodiments of the third aspect of the present application; and a control device as described in any one of the embodiments of the fifth aspect of the present application.

[0035] A seventh aspect of the present application provides a computer-readable storage medium storing at least one program, wherein the at least one program, when called, executes a control method as described in any one of the implementations of the fourth aspect of the present application.

[0036] In an eighth aspect of the present application, a control method for a radiation device is provided, which is used for a radiation device of a 3D printing device. The control method comprises: controlling the radiation device to move from one side of a printing surface to the other side; during the movement of the radiation device, adjusting the angle of at least one energy beam emitted by the radiation device according to the instantaneous position of the radiation device, so as to scan the printing surface according to the cross-sectional image.

[0037] In certain embodiments of the eighth aspect of the present application, the radiation device includes a plurality of arranged energy beam emitters; the step of adjusting the angle of at least one energy beam emitted by the radiation device according to the instantaneous position passed by the radiation device includes: determining each pixel position of the cross-sectional image within the range and its corresponding radiation position based on the range that each energy beam emitter can scan at the instantaneous position; adjusting the angle of the energy beam emitted by the energy beam emitter at the instantaneous position so that the energy beam is radiated to the determined radiation position.

[0038] In certain embodiments of the eighth aspect of the present application, a cross-sectional layer perpendicular to the moving direction is manufactured by adjusting the radiation angle of each of the energy beam emitters.

[0039] In certain embodiments of the eighth aspect of the present application, the instantaneous position is determined according to the initial position and moving speed of the radiation device; or is provided by a sensor arranged on the moving route of the radiation device.

[0040] In certain embodiments of the eighth aspect of the present application, the moving speed of the radiation device, the adjusted energy beam angle, and the emission speed of the energy beam satisfy that the product of the tangent value of the adjusted energy beam angle and the emission speed of the energy beam is equal to the moving speed of the radiation device.

[0041] In certain embodiments of the eighth aspect of the present application, the radiation device is fixed on the body side of the scraper mechanism of the 3D printing device; the step of controlling the radiation device to move from one side of the printing surface to the other side includes: controlling the scraper mechanism and the radiation device of the 3D printing device to move as a whole from one side of the printing surface to the other side.

[0042] In a ninth aspect of the present application, a control method for a radiation device is provided, which is used for a radiation device in a 3D printing device. The control method comprises: controlling the radiation device to move from one side of a printing surface to the other side; during the movement of the radiation device, selectively emitting at least one energy beam according to the correspondence between the instantaneous position of the radiation device and the pixel position of a cross-sectional image, so as to scan the printing surface according to the cross-sectional image.

[0043] In certain embodiments of the ninth aspect of the present application, the radiation device includes a plurality of arranged energy beam emitters; the step of selectively emitting at least one energy beam according to the correspondence between the instantaneous position of the radiation device and the pixel position of the cross-sectional image includes: controlling the corresponding energy beam emitter to emit the energy beam according to the correspondence between the instantaneous position of each of the energy beam emitters and the pixel position of the cross-sectional image.

[0044] In certain embodiments of the ninth aspect of the present application, a cross-sectional layer perpendicular to the moving direction is manufactured by selective energy radiation from each of the energy beam emitters.

[0045] In certain embodiments of the ninth aspect of the present application, the plurality of energy beam emitters form a matrix-arranged lattice-shaped surface array or a staggered lattice-shaped surface array according to the moving direction.

[0046] In certain embodiments of the ninth aspect of the present application, the radiation device is fixed on the body side of the scraper mechanism of the 3D printing device; the step of controlling the radiation device to move from one side of the printing surface to the other side includes: controlling the scraper mechanism and the radiation device of the 3D printing device to move as a whole from one side of the printing surface to the other side.

[0047] One of the above technical solutions has the following beneficial effects:

[0048] The radiation device in the present application can make multiple energy beam emitters radiate energy to each radiation position on the printing surface according to the cross-sectional image and their respective instantaneous positions during the process of moving along the printing surface, thereby selectively radiating the powder material laid in the gap between the component platform and the printing surface of the 3D printing device to form a cross-sectional layer corresponding to the cross-sectional image, thereby significantly improving the printing efficiency through multi-point scanning or line scanning or surface projection. Secondly, the powder spreading device in the present application can integrate powder spreading, preheating and energy radiation into one, and can complete the printing of a cross-sectional layer in the process of moving from one side to the other side along the printing surface, effectively improving the printing efficiency. In addition, the subsequent post-processing process and process of the three-dimensional object manufactured by the present application are simple, which effectively saves the use and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The specific features of the invention involved in this application are shown in the attached claims. The features and advantages of the invention involved in this application can be better understood by referring to the exemplary embodiments and drawings described in detail below. A brief description of the drawings is as follows:

[0050] Figure 1 Shown is a schematic diagram of an arrangement of the energy beam emitters in the present application in one embodiment.

[0051] Figure 2 Shown is a schematic diagram of another embodiment of the arrangement of the energy beam emitter in the present application.

[0052] Figure 3 Shown is a schematic diagram of another embodiment of the arrangement of the energy beam emitter in the present application.

[0053] Figure 4 Shown is a schematic diagram of an embodiment of a method for controlling a radiation device in the present application.

[0054] Figure 5 Shown is a schematic diagram of another embodiment of the control method of the radiation device in the present application.

[0055] Figure 6 Shown is a schematic structural diagram of a 3D printing device in the present application in one embodiment.

[0056] Figure 7 Shown is a schematic diagram of an implementation of a control method for a 3D printing device in the present application.

[0057] Figure 8 Shown is a schematic diagram of a control device for a 3D printing device in one embodiment of the present application. DETAILED DESCRIPTION

[0058] The following is an explanation of the implementation of the present application by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0059] In the following description, with reference to the accompanying drawings, several embodiments of the present application are described. It should be understood that other embodiments may also be used, and mechanical composition, structure, electrical and operational changes may be made without departing from the spirit and scope of the present disclosure. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present application is limited only by the claims of the published patents. The terms used here are only to describe specific embodiments and are not intended to limit the present application. Spatially related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0060] Although the terms first, second, etc. are used to describe various elements or parameters in this article in some instances, these elements or parameters should not be limited by these terms. These terms are only used to distinguish one element or parameter from another element or parameter. For example, the first radiation range can be referred to as the second radiation range, and similarly, the second radiation range can be referred to as the first radiation range without departing from the scope of the various described embodiments. The first radiation range and the second radiation range are both describing a radiation range, but unless the context clearly indicates otherwise, they are not the same radiation range.

[0061] Furthermore, as used in this article, the singular forms "one", "an" and "the" are intended to include plural forms as well, unless there is an indication to the contrary in the context. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way.

[0062] As described in the background technology, the current SLS printing equipment uses a point laser method. According to the pre-planned scanning path, the galvanometer is adjusted to realize the laser in the focused radiation range from point to line and from line to surface, completing the scanning and forming of each layer of 3D printing graphics. However, since the powder is formed by scanning point by point, the efficiency of the entire graphics scanning is not high, which affects the speed of making parts. In addition, after printing a layer of cross-section, the printing powder needs to be spread on the printing surface by a scraper, and the newly spread powder needs to be preheated by a heating device, which leads to further delays in the time of making parts, thereby affecting the efficiency of the entire 3D printing.

[0063] In some embodiments, although preheating is avoided by spraying different adhesives or other special liquids on powder through multi-nozzle spraying to make the powder bond and form, this method requires post-processing of the printed product, which on the one hand increases the post-processing process and also reduces the printing efficiency; on the other hand, the nozzle is prone to clogging and the equipment is costly to use.

[0064] In view of this, a radiation device for a 3D printing device is provided in an embodiment of the first aspect of the present application.

[0065] It should be understood that the 3D printing is a kind of rapid prototyping technology. It is a technology that uses a digital model file as the basis, uses powdered metal or plastic and other bondable powder materials, and constructs objects by printing layer by layer. When printing, the digital model file is first processed to realize the import of the 3D component model to be printed into the 3D printing device. Here, the 3D component model includes but is not limited to a 3D component model based on a CAD component, which is exemplified by an STL file, and the control device performs layout and layer processing on the imported STL file. The 3D component model can be imported into the control device through a data interface or a network interface. The entity part in the imported 3D component model can be of any shape, for example, the entity part includes a tooth shape, a sphere shape, a house shape, a tooth shape, or any shape with a preset structure. Among them, the preset structure includes but is not limited to at least one of the following: a cavity structure, a structure containing a sudden change in shape, and a structure with preset requirements for the contour accuracy in the entity part. The 3D printing device prints the 3D component by exposing and curing the photocurable material layer by layer and accumulating each cured layer.

[0066] Typically, the 3D printing device includes a radiation device, a container for holding powder materials, a component platform located in the container during printing, a Z-axis moving mechanism connected to the component platform, and a control device. The radiation device is arranged above the container to radiate energy during printing to shape the powder material in the container. The component platform is used to attach a solidified layer obtained after energy radiation so as to accumulate and form a printed component through the solidified layer. The Z-axis moving mechanism can adjust the position of the component platform in the Z-axis direction during printing so as to continue to accumulate the solidified layer on the component platform. The control device is electrically connected to the radiation device and the Z-axis moving mechanism, so as to control the radiation device and the Z-axis moving mechanism to work together to perform the printing task.

[0067] The radiation device in the present application is a device in the 3D printing device that provides radiation energy to shape the powder material. The location and type of the radiation device can be determined according to actual needs or the type of 3D printing device.

[0068] In the present application, the 3D printing device can be a selective laser forming 3D printing device, such as a 3D printing device using technologies such as selective laser sintering (SLS), selective laser melting (SLM), and electron beam melting (EBM). It can also be a top surface projection or exposure 3D printing device, such as a DLP (Digital Light Procession, DLP) device that performs surface exposure using a top surface projection optical machine, or an LCD (Liquid Crystal Display, LCD) device that performs top surface exposure. In some embodiments, the top surface exposure 3D printing device can also use LED as the light source of the optical machine to form the powder material.

[0069] Take selective laser sintering (SLS) as an example, which uses infrared laser to sinter powder. The computer converts the three-dimensional data of the object into 2D data of layers of cross-sections and transmits it to the printer. The printer controls the laser to selectively irradiate the powder above the laid powder. The laser energy is absorbed by the powder in the selected area and converted into heat energy. The contact interface between the powder particles heated to the sintering temperature is enlarged, the pores are reduced, and the degree of densification is improved. Then it is cooled and solidified into a dense and hard sintered body, which is processed into the current layer. Subsequently, a new layer of powder is spread on the sintered current layer, and the equipment calls in the data of the new layer of cross-section for processing, and it is bonded with the previous layer of cross-section. This process is repeated layer by layer until the entire object is formed.

[0070] Taking selective laser melting (SLM) as an example, it converts the energy of the laser into heat energy to shape the metal powder. During the manufacturing process, the metal powder is heated until it is completely melted before being formed. The computer converts the three-dimensional data of the object into 2D data of layers of cross sections and transmits it to the printer. The printer controls the laser to selectively irradiate the powder above the laid powder. The laser energy is absorbed by the powder and converted into heat energy. The metal powder in the selected area is heated until it is completely melted and then formed into the current layer. Subsequently, a new layer of powder is spread on the sintered current layer, and the equipment calls in the data of the new layer of cross sections for processing and bonding with the previous layer of cross sections. This process is repeated layer by layer until the entire object is formed.

[0071] Take electron beam melting (EBM) as an example, which uses a high-energy electron beam to melt metal powder. The computer converts the three-dimensional data of the object into 2D data of layers of cross-sections and transmits it to the printer. The printer selectively emits an electron beam to the metal powder above the laid metal powder. The kinetic energy of the electrons is converted into heat energy. The metal powder in the selected area is heated until it is completely melted and then formed into the current layer. Subsequently, a new layer of metal powder is spread on the sintered current layer, and the equipment calls in the data of the new layer of cross-section for processing and bonding with the previous layer of cross-section. This process is repeated layer by layer until the entire object is formed.

[0072] Taking the LCD surface light source curing as an example, in the LCD printing device, there is an LCD screen located above the container and a light source arranged above the LCD screen. The control chip in the radiation device projects the layered image of the slice to be printed onto the printing surface through the LCD screen, and uses the pattern radiation surface provided by the LCD screen to cure the powder material in the container into a corresponding pattern cured layer.

[0073] Taking digital light processing DLP as an example, in the DLP printing device, a DMD chip, a controller and a storage module are included. Among them, the storage module stores a layered image that layers the 3D component model. After receiving the control signal of the controller, the DMD chip irradiates the light source of each pixel on the corresponding layered image to the top surface of the container. Among them, the DMD chip looks like just a small mirror, which is encapsulated in a closed space composed of metal and glass. In fact, this mirror is composed of hundreds of thousands or even millions of micro mirrors, each of which represents a pixel, and the projected image is composed of these pixels. The DMD chip can be simply described as a semiconductor optical switch and micro lens corresponding to the pixel point. The controller allows / disables each micro chip to reflect light by controlling each optical switch in the DMD chip, thereby irradiating the corresponding layered image to the photocurable material through the transparent top of the container, so that the photocurable material corresponding to the image shape is cured to obtain a patterned cured layer.

[0074] For ease of description, the following embodiments will mainly be described by taking the 3D printing device as a selective laser sintering SLS as an example, but the invention is not limited thereto. In other embodiments, other applicable types of 3D printing devices may also be used. Correspondingly, the powder material in this embodiment may be a powder material commonly used in SLS printing, mixed with resin, plastic, etc.

[0075] In the SLS printing device, the container includes a feeding device and a molding cavity. In order to scrape the powder material in the feeding device into the molding cavity, the printing device also includes a working platform and a scraper. Since the cavity opening of the molding cavity and the discharge opening of the feeding device are both located on the working platform, the component platform is located in the molding cavity during the printing process. Therefore, through the lifting and lowering coordination of the molding cavity and the feeding device, the scraper can spread the powder material in the feeding device on the component platform in the molding cavity along the working platform. In the SLS printing device, the printing surface is located on the upper surface of the working platform.

[0076] Usually, the printing surface is also called the printing reference surface, which is located at a corresponding height in the container according to a radiation plane pre-calibrated by the radiation device, and powder material is laid in the gap between the printing surface and the component platform for selective radiation by the radiation device.

[0077] In an exemplary embodiment, the radiation device includes: a moving mechanism, and a plurality of energy beam emitters.

[0078] The moving mechanism can move along the printing surface of the 3D printing device, and the multiple energy beam emitters are arranged and integrally arranged on the moving mechanism. During the movement of the moving mechanism along the printing surface of the 3D printing device, the multiple energy beam emitters selectively radiate the powder material laid in the gap between the component platform and the printing surface of the 3D printing device according to the acquired cross-sectional image, thereby forming a cross-sectional layer corresponding to the cross-sectional image.

[0079] The moving mechanism is arranged outside the container of the 3D printing device and has a crossbeam across the printing surface, and a plurality of energy beam emitters are arranged and integrally arranged on the crossbeam. The moving mechanism also includes: a driving component, which includes, for example, a guide rail and a slider arranged on the guide rail, and the guide rail and the slider arranged on the guide rail can be arranged on one side or both sides of the container. The crossbeam is fixed on the slider, thereby driving the plurality of energy beam emitters to move in the process of the slider moving along the guide rail.

[0080] Since the multiple energy beam emitters perform radiation work during the movement of the moving mechanism, in order to shape the powder material in the gap between the component platform and the printing surface, the movement mode and movement speed of the moving mechanism can be configured according to the working speed of the multiple energy beam emitters. For example, when the working speed of the multiple energy beam emitters is fast (that is, the powder material in the format can be shaped according to the acquired cross-sectional image in a short time), the moving mechanism can be configured to move continuously at a faster speed; for another example, when the working speed of the multiple energy beam emitters is slow, the moving mechanism can be configured to move continuously or intermittently at a slower speed, so as to give the multiple energy beam emitters sufficient time to shape the powder material in the gap between the component platform and the printing surface of the 3D printing device.

[0081] The cross-sectional image is a slice image in the 3D model corresponding to the 3D printing device when the 3D printing device selectively solidifies a cross-sectional layer. In one embodiment, the radiation device is connected to the control device of the 3D printing device, so that the cross-sectional image corresponding to the printing task of each layer is sent to the radiation device, so that the radiation device selectively radiates the powder material laid in the gap between the component platform and the printing surface of the 3D printing device according to the cross-sectional image, thereby forming a cross-sectional layer (i.e., a pattern solidified layer) corresponding to the cross-sectional image.

[0082] It should be understood that the selective radiation refers to selecting a corresponding energy beam emitter to emit an energy beam according to the correspondence between each pixel position to be printed in the cross-sectional image and the radiation position on the printing surface, thereby forming a cross-sectional layer corresponding to the cross-sectional image.

[0083] The energy beam emitter is a device that can emit energy to shape powder materials. The type of energy beam emitter can be determined according to the type of 3D printing equipment. For example, when the 3D printing equipment is an SLS or SLM equipment, the energy beam emitter can be a laser emitting device; when the 3D printing equipment is an EBM equipment, the energy beam emitter can be a high-energy electron beam; when the 3D printing equipment is an LCD equipment, the energy beam emitter can be an LED light source.

[0084] In view of this, it can be understood that the energy radiated by the energy beam emitter can be light energy in some embodiments, such as laser, LED light source, etc. Alternatively, each energy beam emitter can also be connected to an energy source to receive energy provided by the energy source, for example, the energy source is a laser, and the laser is connected to each energy beam emitter through a laser optical fiber to provide energy to each energy beam emitter. In this embodiment, the 3D printing device is an SLS device, and the energy beam emitter is a laser emitting device.

[0085] In an exemplary embodiment, the energy beam emitters are arranged in a line.

[0086] See also Figure 1 , which is a schematic diagram showing the arrangement of the energy beam emitter in the present application in one embodiment.

[0087] In this embodiment, the energy beam emitter includes a laser emission terminal and a galvanometer located on the optical path emitted by each laser emission terminal. The galvanometer includes a reflective mirror surface and a rotation mechanism for adjusting the optical path to change the angle of the energy beam emitted by the laser emission terminal. The reflective mirror surface is exemplified by a prism or a single-sided reflective mirror.

[0088] The laser emission terminals in the energy beam emitter are arranged at intervals according to the angle range of the energy beam that the corresponding galvanometer can adjust (also known as the second radiation range), so that the radiation device can radiate energy without gaps within the width / length of the entire printing format. Figure 1 As shown, each of the energy beam emitters 101 is located on the same straight line and thus arranged in a line, the laser emitted by the laser emission terminal is in a point shape, and each laser emission terminal is controlled to adjust the energy of the output laser beam, for example, the laser emission terminal is controlled to emit a laser beam of preset power and stop emitting the laser beam, and for another example, the laser emission terminal is controlled to increase the power of the laser beam and reduce the power of the laser beam. The laser emitted by the laser emission terminal adjusts the radiation angle of the laser beam through the galvanometer to project the laser beam to the ideal position, so as to shape the powder material in the gap between the component platform and the printing surface.

[0089] During the movement of the mobile mechanism of the radiation device, each galvanometer adjusts the angle of the energy beam emitted by the laser emission terminal according to the instantaneous position of the corresponding laser emission terminal, so that the powder material laid in the gap between the component platform and the printing surface is selectively radiated during the movement of the energy beam emitter with the mobile mechanism and point-by-point scanning, forming a cross-sectional layer corresponding to the cross-sectional image. In this process, since there are multiple energy beam emitters, each energy emitter performs a scanning operation at the same time, thereby improving printing efficiency.

[0090] In a possible implementation, during the movement of the moving mechanism, each of the energy beam emitters adjusts the irradiated angle according to the correspondence between the instantaneous position of the movement and the pixel position in the cross-sectional image to perform energy radiation.

[0091] It should be understood that there is a corresponding relationship between each position point on the printing surface and each pixel point in the cross-sectional image. During printing, each energy beam emitter selectively radiates the powder material according to the cross-sectional image and the corresponding relationship to form a cross-sectional layer corresponding to the cross-sectional image. Here, since the energy beam emitter can adjust the emission angle of its energy beam by adjusting the galvanometer, when the energy beam emitter moves to the corresponding instantaneous position, the radiation angle of the energy beam emitter can be adjusted to radiate on the printing surface according to the pixel position of each pixel point in the cross-sectional image.

[0092] In an exemplary embodiment, see Figure 4 , which is a schematic diagram of a control method for a radiation device in the present application in one embodiment.

[0093] As shown in the figure, in step S410, the radiation device is controlled to move from one side of the printing surface to the other side.

[0094] Here, the arranged energy beam emitters are driven by the moving mechanism of the radiation device to move as a whole from one side of the printing surface to the other side. During the movement, the radiation range of each energy beam emitter of the radiation device can cover the entire printing surface. Among them, one side of the printing surface and the other side of the printing surface are based on the printing length / printing width of the printing surface. Taking the printing surface as a rectangle as an example, if the radiation device moves along the printing length direction, it moves from one side of the short side of the printing surface to the other side of the short side of the printing surface; if the radiation device moves along the printing width direction, it moves from one side of the long side of the printing surface to the other side of the long side of the printing surface.

[0095] In an exemplary embodiment, for a 3D printing device including a scraper mechanism, the radiation device may also be configured to be arranged in linkage with the scraper mechanism of the 3D printing device, so that when the radiation device moves from one side of the printing surface to the other side, the scraper mechanism and the radiation device move from one side of the printing surface to the other side as a whole. For example, the radiation device may be arranged on the scraper mechanism, or the scraper mechanism may be arranged on the radiation device (for example, on the moving mechanism of the radiation device) to achieve overall movement; for another example, the radiation device and the scraper mechanism may be arranged together on a carrying device or the two may be connected side by side to achieve overall movement.

[0096] Please continue reading Figure 4 In step S420, during the movement of the radiation device, the angle of at least one energy beam emitted by the radiation device is adjusted according to the instantaneous position of the radiation device so as to scan the printing surface according to the cross-sectional image.

[0097] The instantaneous position is the position of the radiation device at a certain moment during the movement.

[0098] In one embodiment, the instantaneous position is determined according to the initial position and moving speed of the radiation device. For example, taking the continuous movement of the radiation device as an example, after the moving mechanism of the radiation device starts working, the time difference from the current time to the start time of the work is known, and the instantaneous position of the radiation device can be determined by the initial position and moving speed of the radiation device. In order to ensure that the radiation device selectively radiates energy while continuously moving, the moving speed v satisfies v=tanθ·d with the adjustment of the energy beam angle θ, where d represents the emission speed of the energy beam, so that the contour accuracy of the cross-section obtained by radiation meets the design requirements. In another embodiment, the instantaneous position can also be provided by a sensor arranged on the moving route of the radiation device. For example, taking the intermittent movement or continuous movement of the radiation device as an example, a displacement sensor is arranged on the moving route of the radiation device, and when the radiation device reaches the position of a certain sensor, the induction is triggered to determine the instantaneous position of the radiation device. In another embodiment, the instantaneous position can also be provided by a sensor arranged on the radiation device. For example, a displacement sensor is arranged on the radiation device, and the radiation device can determine the instantaneous position of the radiation device according to the data provided by the displacement sensor.

[0099] Here, the moving mechanism of the radiation device moves from one side of the printing surface to the other side, and the multiple energy beam emitters arranged on the moving mechanism move along the printing surface from one side to the other side with the moving mechanism and radiate energy to the printing surface during the movement. During the movement, each time the moving mechanism moves to a position, each energy beam emitter can scan the printing surface within the range that its energy can radiate at this position. Based on this, during the movement of the moving mechanism, each energy beam emitter adjusts the angle of the emitted energy beam according to the instantaneous position it passes through, thereby scanning the range that can be radiated at the instantaneous position. Among them, the method of adjusting the angle of the emitted energy beam can be achieved by adjusting the galvanometer in the energy beam emitter.

[0100] Since the present application requires the mobile mechanism and the energy beam emitter to work together to complete the printing task, if the mobile mechanism moves too fast, the energy beam emitter cannot complete the scanning task during the movement; if the mobile mechanism moves too slowly, the printing efficiency is affected. Therefore, the mobile mechanism and the energy beam emitter should be configured so that the energy beam emitter can just print the entire cross-sectional image to form a cross-sectional layer during the movement of the mobile mechanism. To this end, on the one hand, it is necessary to reasonably control the moving speed of the mobile mechanism so that its moving speed meets the printing speed of each energy beam emitter; on the other hand, it is also necessary to determine the radiation position corresponding to each pixel position in the cross-sectional image at each instantaneous position within the range that can be scanned by each energy beam emitter, so as to reasonably plan the printing strategy.

[0101] In a possible implementation, first, the pixel positions of the cross-sectional image within the range that can be scanned by each energy beam emitter at the instantaneous position and their corresponding radiation positions are determined, and then the angle of the energy beam emitted by the energy beam emitter at the instantaneous position is adjusted so that the energy beam radiates to the determined radiation position.

[0102] Specifically, since each pixel in the cross-sectional image corresponds to each position in the printing surface, firstly, according to the radiation range (i.e., the scannable range) of each energy beam emitter at the instantaneous position, the pixel positions included in the corresponding range in the cross-sectional image and the radiation positions corresponding to the range in the printing surface are determined, and then each energy beam reflector is set at the instantaneous position to emit energy to the radiation positions according to the pixel positions in the cross-sectional image. Assuming that the pixel points that need to be scanned in the cross-sectional image are black points and the pixel points that do not need to be scanned are white points, each energy beam emitter adjusts the galvanometer according to the black point pixel positions in the range so that the laser beam projects energy to the radiation positions of these black point pixel positions corresponding to the printing surface, so as to form the powder material in the gap between the component platform and the printing surface into a cross-sectional layer corresponding to the cross-sectional image.

[0103] The printing process of the radiation device in this embodiment at a certain instantaneous position will be described below by using an example.

[0104] Please continue reading Figure 1 ,exist Figure 1 In the example shown, the direction of the arrow is perpendicular to the direction of travel of the moving mechanism, and the maximum swing amplitude of the galvanometer of each energy beam emitter 101 is angle θ (the size of angle θ matches the moving speed of the moving mechanism), and the scanning range of each energy beam emitter can be determined by angle θ.

[0105] Here, the energy beam emitters can adjust the radiation angle to produce a cross-section layer perpendicular to the moving direction. Figure 1 A straight line in the direction of the arrow in the middle (i.e., the cross-sectional image includes the straight line), firstly, the corresponding pixel range of each scanning range mapped in the cross-sectional image is determined according to the scanning range of each energy beam emitter at each instantaneous position during the movement process, so as to determine the pixel position of the straight line to be printed in each pixel range, and the radiation position of each pixel position of the straight line corresponding to the printing surface. During the movement of the moving mechanism, when the corresponding instantaneous position is reached, each energy beam emitter is controlled to emit a laser beam to the radiation position corresponding to the instantaneous position, so that the powder material in the gap between the component platform and the printing surface is formed to form the straight line.

[0106] In one embodiment, the straight line can be divided into a number of line segments according to the radiation range of each of the energy beam emitters, each line segment is configured to be printed by a different energy beam emitter, and each line segment is further divided into a number of printing points, so that each energy beam emitter is controlled to radiate energy to part of the printing points in the corresponding line segment at different instantaneous positions, thereby completing the printing of the entire straight line after passing through multiple instantaneous positions.

[0107] In an exemplary embodiment, to further improve printing efficiency, the energy radiated by the radiation device may be linear or planar. For example, each of the energy beam emitters may be arranged in a planar array. The planar array includes: a matrix-arranged dot-array planar array formed according to the moving direction, or a staggered dot-array planar array formed according to the moving direction.

[0108] In one embodiment, see Figure 2 , which is a schematic diagram of the arrangement of the energy beam emitters in the present application in another embodiment. As shown in the figure, multiple energy beam emitters are arranged according to the moving direction of the moving mechanism (i.e. Figure 2 The surface array 201 is formed into a matrix-arranged dot matrix surface array 201 (in the direction of arrow a in the figure), and each energy beam emitter in the surface array 201 is controlled to adjust the energy and switch of the output energy beam, so that the surface array 201 adjusts its projection format according to the cross-sectional image. During the movement of the moving mechanism, the surface array 201 shapes the powder material in the gap between the component platform and the printing surface in a surface exposure manner to form a cross-sectional layer corresponding to the cross-sectional image. In some cases, since the format of the surface array 201 cannot cover the entire area to be printed in one projection process, the surface array 201 and the moving mechanism can be configured as follows: when the moving mechanism moves a preset distance, the surface array 201 radiates energy to the gap between the component platform and the printing surface to selectively radiate the powder material in the area, and after the surface array 201 completes the printing task of the area, the moving mechanism continues to move the preset distance so that the surface array 201 completes the printing task of the next area. The size of the preset distance can be determined according to the size of the surface array 201 and the energy of each energy beam emitter, so that the printing of the cross-sectional layer is complete and the degree of curing of each area is even.

[0109] In another embodiment, see Figure 3 , which is a schematic diagram showing the arrangement of the energy beam emitters in the present application in another embodiment. As shown in the figure, multiple energy beam emitters are arranged according to the moving direction of the moving mechanism (i.e. Figure 3The laser beams radiated by the radiation device are linear, and each linear laser beam is composed of point lasers emitted by a plurality of energy beam emitters arranged along a straight line. The energy beam emitters arranged along the same straight line are defined as an energy beam emission group, and each energy beam emitter in the energy beam emission group is controlled to adjust the switch and energy of the output laser beam, and the powder material scanned by the laser beam of the energy beam emission group is solidified into a corresponding cross-sectional layer.

[0110] It should be understood that since the energy beam emitter is relatively large, staggering multiple energy beam emitters can take into account the problem of installation space and radiation surface. The specific form of the staggered arrangement can be determined according to actual needs, for example, Figure 3 The surface array shown in ( Figure 3 Each point in the array is an energy beam emitter), or it can be a parallelogram dot matrix surface array, or a hexagonal dot matrix surface array with protruding sides, or a hexagonal dot matrix surface array with concave sides, etc.

[0111] Here, in order to ensure the printing efficiency, the arrangement of the surface array formed by the energy beam emitters or the arrangement of the surface array formed by the energy beam emitters should be set according to the moving direction of the moving mechanism. For example, in order to avoid repeated movement of the moving device, the surface array is configured to cover at least the vertical direction of the moving direction of the moving mechanism (i.e. Figure 2 , Figure 3 The printing process of one cross-section layer can be completed in one stroke of the moving mechanism.

[0112] In an exemplary embodiment, see Figure 5 , which is a schematic diagram of another embodiment of the control method of the radiation device in the present application.

[0113] As shown in the figure, in step S510, the radiation device is controlled to move from one side of the printing surface to the other side.

[0114] Here, the energy beam emitters are driven to move from one side of the printing surface to the other side by the control mechanism of the radiation device. During the movement, the radiation range of each energy beam emitter of the radiation device can cover the entire printing surface.

[0115] In an exemplary embodiment, for a 3D printing device including a scraper mechanism, the radiation device may also be configured to be arranged in linkage with the scraper mechanism of the 3D printing device, so that when the radiation device moves from one side of the printing surface to the other side, the scraper mechanism and the radiation device move from one side of the printing surface to the other side as a whole. For example, the radiation device may be arranged on the scraper mechanism, or the scraper mechanism may be arranged on the radiation device to achieve overall movement; for another example, the radiation device and the scraper mechanism may be arranged together on a carrying device or the two may be connected side by side to achieve overall movement.

[0116] Please continue reading Figure 5 In step S520, during the movement of the radiation device, at least one energy beam is selectively emitted according to the correspondence between the instantaneous position of the radiation device and the pixel position of the cross-sectional image, so as to scan the printing surface according to the cross-sectional image, that is, each energy beam emitter selectively radiates energy according to the correspondence between the instantaneous position of the movement and the pixel position of the cross-sectional image.

[0117] It should be understood that the radiation position of the energy emitted by each energy beam emitter on the printing surface is determined according to the position of each energy beam emitter on the printing surface, and each radiation position on the printing surface corresponds to a pixel position in the cross-sectional image.

[0118] Therefore, in one embodiment, for example, when the surface array formed by the arrangement of energy beam emitters is used to form the powder material in the gap between the component platform and the printing surface by surface exposure, during the movement of the radiation device, the instantaneous position of the surface array formed by multiple energy beam emitters and the radiation position of each energy beam emitter in the surface array can be mapped to the pixel position in the cross-sectional image, and the surface array can be controlled to project onto the printing surface according to the cross-sectional image.

[0119] In another embodiment, for example, when multiple energy beam emitters of the radiation device are staggered to form a dot matrix array, the corresponding energy beam emitters can be controlled to emit energy beams based on the correspondence between the instantaneous position of each energy beam emitter and the pixel position of the cross-sectional image.

[0120] Here, during the movement of the radiation device, each energy beam emitter selectively emits an energy beam according to each instantaneous position it passes through during the movement, the radiation position corresponding to each energy beam emitter at the instantaneous position, and the pixel position mapped to each radiation position in the cross-sectional image. Assuming that the pixel points that need to be scanned in the cross-sectional image are black points, and the pixel points that do not need to be scanned are white points, when the radiation position corresponding to an energy beam emitter at a certain instantaneous position is mapped to a black point in the cross-sectional image, the energy beam emitter is controlled to emit an energy beam to the printing surface, thereby scanning on the printing surface according to the cross-sectional image.

[0121] The printing process of the radiation device in this embodiment at a certain instantaneous position will be described below by using an example.

[0122] Please continue reading Figure 3 ,exist Figure 3 In the example shown, the arrow b direction is a direction perpendicular to the travel direction of the moving mechanism. The angle between each laser beam and the b direction is angle θ, and the size of the angle θ is configured to match the moving speed of the moving mechanism.

[0123] Here, each of the energy beam emitters can selectively radiate energy to produce a cross-section layer perpendicular to the moving direction. Figure 3 A straight line in the direction of arrow b in the middle (i.e., the cross-sectional image includes the straight line), firstly, according to each instantaneous position of each energy beam emitter during the movement process, the radiation position of each energy beam emitter at each instantaneous position is determined, and the radiation position of the pixel position to be printed on the printing surface is determined through the mapping relationship between the radiation position and the pixel position in the cross-sectional image. In the process of the moving mechanism moving along the working surface, when it moves to the corresponding instantaneous position, the corresponding energy beam emitter is controlled to emit energy to the radiation position.

[0124] In one embodiment, the straight line can be divided into a number of line segments according to the radiation range of each energy beam emission group, each line segment is configured to be printed by a different energy beam emission group, and each line segment is further divided into a number of printing points, so as to control each energy beam emitter in the energy beam emission group to emit energy to the corresponding printing point when reaching the corresponding instantaneous position.

[0125] In an exemplary embodiment, the radiation range of the radiation device within the travel range of the moving mechanism is defined as the first radiation range, and the range scanned by the corresponding energy beam emitter or the range of the energy beam emitted by the corresponding energy beam emitter is defined as the second radiation range, that is, the second radiation range is the range that the energy of a single energy beam emitter can reach. Then the first radiation range should cover the printing width and printing length of the entire printing surface, so as to completely print the cross-sectional layer corresponding to the cross-sectional image based on the acquired cross-sectional image. Each of the energy beam emitters is arranged at intervals according to its own second radiation range, so that the sum of the second radiation ranges of each energy beam emitter can cover the printing width and printing length of the entire printing surface.

[0126] In summary, the radiation device in the present application can enable multiple energy beam emitters to radiate energy to each radiation position on the printing surface according to the cross-sectional image and their respective instantaneous positions during the process of moving along the printing surface, thereby selectively radiating the powder material laid in the gap between the component platform of the 3D printing device and the printing surface to form a cross-sectional layer corresponding to the cross-sectional image, thereby significantly improving the printing efficiency through multi-point scanning, line scanning or surface projection.

[0127] Based on the technical framework reflected by the various examples described in the above-mentioned control method of the radiation device, this application discloses the following technical solutions:

[0128] 1. A control method for a radiation device, characterized in that the radiation device is used for a 3D printing device, and the control method comprises:

[0129] Controlling the radiation device to move from one side of the printing surface to the other side;

[0130] During the movement of the radiation device, the angle of at least one energy beam emitted by the radiation device is adjusted according to the instantaneous position of the radiation device so as to scan the printing surface according to the cross-sectional image.

[0131] 2. The control method of the radiation device according to embodiment 1 is characterized in that the radiation device comprises a plurality of energy beam emitters arranged in an arranged manner; and the step of adjusting the angle of at least one energy beam emitted by the radiation device according to the instantaneous position of the radiation device comprises:

[0132] Determine the positions of each pixel of the cross-sectional image and its corresponding radiation position within the range that can be scanned by each energy beam emitter at the instantaneous position;

[0133] The angle of the energy beam emitted by the energy beam emitter at the instantaneous position is adjusted so that the energy beam radiates to the determined radiation position.

[0134] 3. The control method of the radiation device according to embodiment 2 is characterized in that a cross-sectional layer perpendicular to the moving direction is produced by adjusting the radiation angle of each energy beam emitter.

[0135] 4. The control method of the radiation device according to embodiment 1 is characterized in that the instantaneous position is determined according to the initial position and moving speed of the radiation device; or is provided by a sensor arranged on the moving route of the radiation device.

[0136] 5. The control method of the radiation device according to embodiment 1 is characterized in that the moving speed of the radiation device, the adjusted energy beam angle, and the emission speed of the energy beam satisfy that the product of the tangent value of the adjusted energy beam angle and the emission speed of the energy beam is equal to the moving speed of the radiation device.

[0137] 6. The control method of the radiation device according to embodiment 1 is characterized in that the radiation device is fixed on the body side of the scraper mechanism of the 3D printing device; the step of controlling the radiation device to move from one side of the printing surface to the other side includes: controlling the scraper mechanism and the radiation device of the 3D printing device to move as a whole from one side of the printing surface to the other side.

[0138] 7. A control method for a radiation device, characterized in that the radiation device is used in a 3D printing device, and the control method comprises:

[0139] Controlling the radiation device to move from one side of the printing surface to the other side;

[0140] During the movement of the radiation device, at least one energy beam is selectively emitted according to the correspondence between the instantaneous position of the radiation device and the pixel position of the cross-sectional image, so as to scan the printing surface according to the cross-sectional image.

[0141] 8. The control method of the radiation device according to embodiment 7 is characterized in that the radiation device comprises a plurality of energy beam emitters arranged in an arranged manner; and the step of selectively emitting at least one energy beam according to the correspondence between the instantaneous position of the radiation device and the pixel position of the cross-sectional image comprises:

[0142] According to the correspondence between the instantaneous position of each energy beam emitter and the pixel position of the cross-sectional image, the corresponding energy beam emitter is controlled to emit the energy beam.

[0143] 9. The control method of the radiation device according to embodiment 8 is characterized in that a cross-sectional layer perpendicular to the moving direction is manufactured by selective energy radiation of each of the energy beam emitters.

[0144] 10. The control method of the radiation device according to embodiment 7 or 8 is characterized in that the multiple energy beam emitters form a matrix-arranged dot matrix surface array or a staggered dot matrix surface array according to the moving direction.

[0145] 11. The control method of the radiation device according to embodiment 7 is characterized in that the radiation device is fixed on the body side of the scraper mechanism of the 3D printing device; the step of controlling the radiation device to move from one side of the printing surface to the other side includes: controlling the scraper mechanism and the radiation device of the 3D printing device to move as a whole from one side of the printing surface to the other side.

[0146] A powder spreading device is provided in an embodiment of the second aspect of the present application.

[0147] In an exemplary embodiment, the powder spreading device includes: a radiation device and a scraper mechanism.

[0148] The scraper mechanism is arranged on the moving mechanism of the radiation device and moves integrally with the plurality of arranged energy beam emitters, that is, when the energy beam emitters move with the moving mechanism, the scraper mechanism also moves therewith.

[0149] When the feeding device of the 3D printing equipment rises and the molding cavity drops by a cross-sectional layer thickness, the scraper mechanism can scrape the powder material in the feeding device into the molding cavity during movement and lay it in the gap between the component platform and the printing surface.

[0150] In a possible implementation manner, the scraper mechanism includes a scraper and a scraper connecting member for connecting the scraper to the moving mechanism, and the scraper is used to scrape and lay the powder material during the movement of the moving mechanism.

[0151] The specific structure of the radiation device is similar to that of the embodiment of the first aspect of the present application (i.e. Figure 1 to Figure 5 The radiation device structure in the corresponding implementation method) is the same, so it will not be repeated here.

[0152] In one embodiment, the multiple energy beam emitters arranged in the radiation device are disposed on the moving mechanism and are all located on one side of the scraper mechanism. During the movement of the moving mechanism, the multiple energy beam emitters of the radiation device move together with the scraper mechanism. After the scraper mechanism scrapes the powder material in the feeding device into the molding cavity and lays it in the gap between the component platform and the printing surface, the radiation device can selectively radiate the powder material to form a cross-sectional layer corresponding to the cross-sectional image, thereby accelerating the printing efficiency.

[0153] Since the above embodiment only arranges a plurality of energy beam emitters on one side of the scraper, during the printing process, only when the moving direction of the moving mechanism is opposite to the direction of the plurality of energy beam emitters relative to the scraper, the powder spreading and radiation forming operations of the cross-section layer can be completed during the movement of the scraper mechanism from one side of the printing surface to the other side. After completing the operation of a cross-section layer, it is necessary to control the moving mechanism to drive the scraper mechanism and the plurality of energy beam emitters to return to the starting side, and then print the next layer.

[0154] In another embodiment, in order to further improve the printing efficiency, the radiation device is symmetrically arranged on both sides of the scraper mechanism; during the movement, a plurality of energy beam emitters arranged to follow one side of the scraper mechanism perform the radiation operation.

[0155] Specifically, the multiple energy beam emitters in the radiation device constitute two symmetrical radiation modules, and the two symmetrical radiation modules are respectively located on both sides of the scraper mechanism. During the movement of the moving mechanism, the multiple energy beam emitters in the radiation module on the opposite side of the moving direction of the moving mechanism selectively radiate the powder material after the scraper mechanism scrapes the powder material in the feeding device into the molding cavity and lays it in the gap between the component platform and the printing surface, so as to form a cross-sectional layer corresponding to the cross-sectional image. For example, when the starting position of the moving mechanism is on the right side of the printing surface, in the process of the moving mechanism moving from the right side of the printing surface to the left side of the printing surface (that is, the moving direction of the moving mechanism is to move to the left), the scraper mechanism scrapes the powder material in the feeding device into the molding cavity and lays it in the gap between the component platform and the printing surface, and the multiple arranged energy beam radiators located on the right side of the scraper mechanism selectively radiate the powder material laid in the gap between the component platform and the printing surface, thereby forming a cross-sectional layer corresponding to the cross-sectional image. On the contrary, when the starting position of the moving mechanism is on the left side of the printing surface, in the process of the moving mechanism moving from the left side of the printing surface to the right side of the printing surface (that is, the moving direction of the moving mechanism is to the right), the scraper mechanism scrapes the powder material in the feeding device into the molding cavity and lays it in the gap between the component platform and the printing surface, and a plurality of arranged energy beam radiators located on the left side of the scraper mechanism selectively radiate the powder material laid in the gap between the component platform and the printing surface, thereby forming a cross-sectional layer corresponding to the cross-sectional image.

[0156] In a possible implementation, the component platform can be configured as a substrate with high thermal conductivity, such as a sandblasted aluminum alloy plate, etc. Thus, during printing, a heat source (such as a resistance heating element, etc.) provides heat to the substrate to preheat the powder material laid in the gap between the component platform and the printing surface, so as to facilitate its molding after being irradiated by the energy beam radiator.

[0157] In an exemplary embodiment, the radiation device further includes a preheating device for preheating the laid powder material so that the multiple arranged energy beam emitters can radiate the preheated powder material in the gap.

[0158] It should be understood that preheating the powder material to a temperature slightly lower than its melting point can help improve the molding efficiency and quality of the powder material during printing. The preheated powder material is selectively irradiated by each energy beam emitter according to the cross-sectional image to obtain a cross-sectional layer, and bonded to the formed part. After one layer is printed, the next layer is preheated and printed. After all printing is completed, the excess powder is removed to obtain a 3D printed component.

[0159] In a possible embodiment, the preheating device includes a heating element, which is used to preheat the powder material so as to facilitate its molding after being irradiated by the energy beam radiator. For example, the heating element can be a light source with a controllable range, and examples of the light source include but are not limited to infrared, semiconductor laser, and other light sources that can heat a partial area.

[0160] In an exemplary embodiment, for a radiation device in which a plurality of energy beam emitters are arranged on a moving mechanism and are all located on one side of a scraper mechanism, the preheating device may be arranged between the scraper mechanism and the plurality of energy beam emitters. During the movement of the moving mechanism, the scraper mechanism, the preheating device, and the plurality of energy beam emitters arranged on the moving mechanism move with the moving mechanism. After the scraper mechanism scrapes the powder material in the feeding device into the molding cavity and lays it in the gap between the component platform and the printing surface, the preheating device can preheat the powder material. The preheated powder material is selectively irradiated by the radiation device to form a cross-sectional layer corresponding to the cross-sectional image, thereby completing the powder laying, preheating, and printing of a cross-sectional layer in one movement process.

[0161] Since the above embodiment is only provided with a preheating device and a plurality of energy beam emitters on one side of the scraper, during the printing process, only when the moving direction of the moving mechanism is opposite to the direction of the preheating device and the plurality of energy beam emitters relative to the scraper, the powder spreading, preheating and radiation forming operations of the cross-section layer can be completed during the movement of the scraper mechanism from one side of the printing surface to the other side. After completing the operation of a cross-section layer, it is necessary to control the moving mechanism to drive the scraper mechanism, the preheating device and the plurality of energy beam emitters to return to the starting side, and then print the next layer.

[0162] In another embodiment, in order to further improve the printing efficiency, the preheating device is symmetrically arranged on both sides of the scraper mechanism; during the movement, the preheating device following one side of the scraper mechanism performs the preheating operation.

[0163] Specifically, the multiple energy beam emitters in the radiation device constitute two symmetrical radiation modules, and the two symmetrical radiation modules are respectively located on both sides of the scraper mechanism; the preheating device includes two heating modules, and the two heating modules are respectively located between the two radiation modules and the scraper mechanism. During the movement of the moving mechanism, the heating module on the side opposite to the moving direction of the moving mechanism preheats the powder material after the scraper mechanism scrapes the powder material in the feeding device into the molding cavity and lays it in the gap between the component platform and the printing surface. After preheating, the multiple energy beam emitters in the radiation module on the side opposite to the moving direction of the moving mechanism selectively radiate the powder material to form a cross-sectional layer corresponding to the cross-sectional image. For example, when the starting position of the moving mechanism is on the right side of the printing surface, in the process of the moving mechanism moving from the right side of the printing surface to the left side of the printing surface (that is, the moving direction of the moving mechanism is to the left), the scraper mechanism scrapes the powder material in the feeding device into the molding cavity and lays it in the gap between the component platform and the printing surface, and the heating module located on the right side of the scraper mechanism preheats the powder material laid in the gap between the component platform and the printing surface. After preheating, a plurality of arranged energy beam radiators located on the right side of the scraper mechanism selectively radiate the powder material laid in the gap between the component platform and the printing surface, thereby forming a cross-sectional layer corresponding to the cross-sectional image. On the contrary, when the starting position of the moving mechanism is on the left side of the printing surface, in the process of the moving mechanism moving from the left side of the printing surface to the right side of the printing surface (that is, the moving direction of the moving mechanism is to move to the right), the scraper mechanism scrapes the powder material in the feeding device into the molding cavity and lays it in the gap between the component platform and the printing surface, and the heating module located on the left side of the scraper mechanism preheats the powder material laid in the gap between the component platform and the printing surface. After preheating, a plurality of arranged energy beam radiators located on the left side of the scraper mechanism selectively radiate the powder material laid in the gap between the component platform and the printing surface, thereby forming a cross-sectional layer corresponding to the cross-sectional image.

[0164] In summary, the powder spreading device in the present application can integrate powder spreading, preheating and energy radiation into one, and can complete the printing of a cross-sectional layer in the process of moving from one side to the other along the printing surface, thereby effectively improving the printing efficiency.

[0165] A 3D printing device is provided in an embodiment of the third aspect of the present application.

[0166] Among them, the powder material used in the 3D printing device is a powder material, and the powder material can be determined according to the type of printing device. For example, when the 3D printing device is an SLS device, the powder material includes but is not limited to nylon powder, nylon carbon fiber powder, nylon aluminum powder, polystyrene powder, glass fiber reinforced nylon powder, etc.; when the 3D printing device is an SLM device or an EBM device, the powder material can be a metal powder, etc., and the metal powder can be a metal powder of a single material or a mixed metal powder containing two or more metal powders.

[0167] In an exemplary embodiment, see Figure 6 , which is a schematic diagram of the structure of a 3D printing device in one embodiment of the present application. As shown in the figure, the 3D printing device includes: a component platform (not shown), a Z-axis moving mechanism (not shown), a feeding device (61, 61'), and a powder spreading device 62.

[0168] In an exemplary embodiment, the Z-axis moving mechanism is also referred to as a platform lifting mechanism. Figure 6 In the illustrated embodiment, the Z-axis moving mechanism is connected to the component platform and is used to drive the component platform to move in the Z-axis direction. When the 3D printing device completes printing of a cross-sectional layer, the Z-axis moving mechanism drives the component platform to descend a preset height as the thickness of the next cross-sectional layer so that the gap between the component platform and the printing surface is filled with powder material. For example, the preset height to which the component platform descends can be set to 0.05 mm to 0.15 mm, etc. according to the thickness of the cross-sectional layer. Usually, the printing surface is preset at the interface between the powder material and the air. After a layer of solidification is completed, the Z-axis moving mechanism drives the component platform and the solidified layer attached thereto to descend to fill and form a new pre-printed layer. By analogy, after multiple fillings and irradiations, each solidified layer accumulates on the component platform to obtain a three-dimensional object (i.e., a 3D printed component).

[0169] In a possible implementation, the Z-axis moving mechanism includes a driving unit and a vertical moving unit, and the driving unit is used to drive the vertical moving unit so that the vertical moving unit drives the component platform to move up and down. For example, the driving unit is a driving motor. The driving unit is controlled by a control instruction. Among them, the control instruction includes: a directional instruction for indicating that the component platform rises, falls or stops, and may even include parameters such as rotation speed / speed acceleration, or torque / torque. This is conducive to accurately controlling the rising distance of the vertical moving unit to achieve precise adjustment of the Z axis. Here, the vertical moving unit includes, for example, a fixed rod fixed at one end on the component platform, and an interlocking moving component fixed to the other end of the fixed rod, wherein the interlocking moving component is driven by the driving unit to drive the fixed rod to move vertically, and the interlocking moving component is exemplified by a limit moving component engaged by a toothed structure, such as a rack. For another example, the vertical moving unit includes: a screw and a positioning moving structure screwed to the screw, wherein both ends of the screw are screwed to the driving unit, and the outer end of the positioning moving structure is fixedly connected to the component platform, and the positioning moving structure can be a ball screw. It should be understood that the Z axis is usually a vertical direction, that is, a direction perpendicular to the horizontal direction.

[0170] The powder spreading device is used to spread the powder material in the gap between the component platform and the printing surface on the one hand, and to radiate the laid powder material on the other hand. In one embodiment, the preheating device in the powder spreading device can preheat the laid powder material to facilitate the rapid molding and molding quality of the powder material. The powder spreading device can be a powder spreading device as described in the embodiment of the second aspect of the present application, so it will not be repeated here.

[0171] In an exemplary embodiment, the component platform is used to attach and carry the formed cross-sectional layers, and the cross-sectional layers on the component platform are accumulated layer by layer to form a three-dimensional object. In some embodiments, the component platform is also called a component plate.

[0172] In one embodiment, please continue to refer to Figure 6 The 3D printing device also includes a molding cavity 63, and the component platform is located in the molding cavity 63 and can be controlled by the Z-axis moving mechanism to move up and down in the molding cavity 63.

[0173] In summary, the 3D printing equipment of the present application can integrate powder laying, preheating and energy radiation into one, and can complete the printing of a cross-sectional layer in the process of its moving mechanism moving along the printing surface from one side to the other side. The printing efficiency can be further improved by arranging preheating devices and multiple energy beam emitters on both sides of the scraper mechanism to avoid the scraper "running empty".

[0174] The feeding device is arranged on at least one side of the component platform to provide powder material for manufacturing the cross-sectional layer of the three-dimensional object. In other words, the powder material of the 3D printing equipment is stored in the feeding device.

[0175] The feeding device includes but is not limited to a container for containing the powder material. In one embodiment, the feeding device has a lifting device at the bottom, and the lifting device can raise or lower the position of the powder material in the feeding device, so that when the position of the powder material in the feeding device rises, the powder material is scraped and spread between the component platform and the printing surface by using the scraper mechanism in the powder spreading device.

[0176] In a possible embodiment, the feeding device may include a cylinder and a bottom plate as the bottom surface of the cylinder, and the bottom of the bottom plate is connected to a vertical driving mechanism so that it can rise or fall along the inner wall of the cylinder under the drive of the vertical driving mechanism. The cylinder and the bottom plate constitute a space for accommodating the powder material, and when the bottom plate rises or falls, the position of the powder material in the cylinder rises or falls accordingly. Among them, the vertical driving mechanism may include a driving motor, a ball screw, etc., so that the bottom plate is driven to rise or fall through the ball screw under the drive of the driving motor.

[0177] In an exemplary embodiment, the feeding device is disposed on one side of the component platform. Specifically, the feeding device is located on the same side of the component platform as the side where the multiple energy beam emitters in the powder spreading device are disposed relative to the scraper mechanism. That is, when the multiple energy beam emitters in the powder spreading device are disposed on the left side of the scraper mechanism, the feeding device is located on the left side of the component platform; when the multiple energy beam emitters in the powder spreading device are disposed on the right side of the scraper mechanism, the feeding device is located on the right side of the component platform.

[0178] In the printing state, the position of the powder material in the feeding device is raised to a certain height, and the position of the component platform is adjusted to leave the printing thickness of the current cross-sectional layer between the component platform and the printing surface. When the moving mechanism in the powder spreading device moves along the printing surface, the scraper mechanism first spreads the powder material in the gap between the component platform and the printing surface, and the preheating device arranged on one side of the scraper mechanism immediately heats the laid powder material, and then the powder material in the gap between the component platform and the printing surface is selectively irradiated by multiple energy beam emitters to form a cross-sectional layer corresponding to the cross-sectional image. After processing a cross-sectional layer, the moving mechanism is controlled to return to the starting position to carry out the printing task of the next cross-sectional layer. Repeating this operation until the printing tasks of all cross-sectional layers are completed, the printing of the entire three-dimensional object can be completed.

[0179] In another exemplary embodiment, please continue to refer to Figure 6 , the feeding devices (61, 61') are symmetrically arranged on both sides of the component platform. In order to make full use of the feeding devices (61, 61') located on both sides of the component platform, the radiation devices (624, 624') in the powder spreading device 62 are symmetrically arranged on both sides of the scraper mechanism 622, and during the movement, the multiple energy beam emitters arranged on one side of the scraper mechanism perform the radiation operation.

[0180] Here, assuming that the initial position of the moving mechanism is on the right side of the printing surface, in the printing state, the position of the powder material in the right feeding container 61' rises, and the component platform descends to reserve a cross-sectional layer thickness between it and the printing surface. In the process of the moving mechanism 621 moving from the right side of the printing surface to the left side of the printing surface, the scraper mechanism 622 first spreads the powder material in the feeding container 61' on the surface of the component platform, and the preheating device 623' arranged on the right side of the scraper mechanism immediately heats the laid powder material. Subsequently, the multiple energy beam emitters 624' located on the right side of the scraper mechanism selectively scan the powder material located between the printing surface and the component platform according to the cross-sectional image, thereby completing the pattern radiation from right to left (of the printing surface), that is, completing the cross-sectional layer of the current layer. When printing the next cross-sectional layer, the powder material in the left feeding container 61 is raised, and the component platform is lowered to reserve a cross-sectional layer thickness between it and the printing surface. The powder material in the right feeding container 61' is lowered. In the process of the moving mechanism moving from the left side of the printing surface to the right side of the printing surface, the scraper mechanism 622 first spreads the powder material in the feeding container 61 on the surface of the component platform, and the preheating device 623 arranged on the left side of the scraper mechanism immediately heats the laid powder material. Subsequently, the multiple energy beam emitters 624 located on the left side of the scraper mechanism selectively scan the powder material between the printing surface and the component platform according to the cross-sectional image, thereby completing the pattern radiation from left to right (of the printing surface), that is, completing the cross-sectional layer of the current layer. This is repeated many times until the printing of all cross-sectional images is completed, and finally the printing and forming of the entire three-dimensional object is completed.

[0181] In an embodiment of a fourth aspect of the present application, a method for controlling a 3D printing device is provided.

[0182] The 3D printing device includes a Z-axis moving mechanism, a material feeding device, a scraper mechanism, and a radiation device.

[0183] Wherein, the feeding device is arranged on at least one side of the component platform, and is used to provide powder material for manufacturing the cross-sectional layer of the three-dimensional object. The scraper mechanism is used to lay the powder material in the gap between the component platform and the printing surface of the 3D printing device. The Z-axis moving mechanism is connected to the component platform to control the position of the component platform on the Z-axis mechanism, so that the gap between the component platform and the printing surface is filled with powder material. The radiation device is used to selectively radiate the powder material laid in the gap between the component platform and the printing surface of the 3D printing device according to the acquired cross-sectional image to form a cross-sectional layer corresponding to the cross-sectional image. The specific structure of the radiation device can refer to the radiation device structure in the embodiment of the first aspect of the present application, which will not be repeated here.

[0184] In one embodiment, the control method can be performed by a control system connected to the 3D device. The control system includes software and hardware installed in a computer device. The computer device includes any electronic device capable of performing numerical, data and logic processing. For example, the computer device includes but is not limited to: a desktop computer, a handheld computer, or an intelligent terminal based on an embedded operating system. The computer device is connected to the Z-axis moving system, the feeding device, the scraper mechanism and the radiation device of the 3D printing device, so as to control the Z-axis moving system, the feeding device, the scraper mechanism and the radiation device to work together to print a three-dimensional object.

[0185] See also Figure 7 , which is a schematic diagram of a control method for a 3D printing device in the present application in one embodiment.

[0186] As shown in the figure, in step S710, the Z-axis moving mechanism is controlled to move so that there is a gap between the component platform and the printing surface of the 3D printing device.

[0187] Here, the Z-axis driving mechanism is controlled to rise and fall so that a gap of a cross-section layer is maintained between the building platform connected to the Z-axis driving mechanism and the printing surface of the 3D printing device, so that the powder material can be filled in the gap.

[0188] In step S720, the feeding device is controlled to replenish powder material.

[0189] The feeding device includes but is not limited to a container for containing the powder material. In one embodiment, the feeding device has a lifting device at the bottom, and the lifting device can raise or lower the position of the powder material in the feeding device, so that when the position of the powder material in the feeding device rises, the powder material can be scraped and spread between the component platform and the printing surface by using the scraper mechanism in the powder spreading device.

[0190] In one embodiment, the feeding device is arranged on one side of the component platform. Specifically, the feeding device is located on the same side of the component platform as the setting position of the multiple energy beam emitters in the powder spreading device relative to the scraper mechanism. That is, when the multiple energy beam emitters in the powder spreading device are all arranged on the left side of the scraper mechanism, the feeding device is located on the left side of the component platform; when the multiple energy beam emitters in the powder spreading device are all arranged on the right side of the scraper mechanism, the feeding device is located on the right side of the component platform. Here, the position of the powder material in the feeding device is raised to replenish the powder material.

[0191] In another embodiment, the feeding device is symmetrically arranged on both sides of the component platform. When executing step S720, the feeding device close to the scraper mechanism before the moving mechanism moves is replenished with powder material. It should be understood that in the embodiment where the feeding device is arranged on both sides of the component platform, the printing of a cross-sectional layer can be completed in the process of the scraper mechanism, the preheating device, and the multiple energy beam emitters moving from one side of the printing surface to the other side, that is, the printing of two cross-sectional layers can be completed in the process of the scraper mechanism, the preheating device, and the multiple energy beam emitters going back and forth once. Therefore, during the printing process, it can be determined which feeding device is needed to replenish the powder material based on the starting position of the scraper mechanism, the preheating device, and the multiple energy beam emitters before printing the current cross-sectional layer. In order to make the powder material replenished by the feeding device be scraped and laid between the component platform and the printing surface, the feeding device close to the scraper mechanism before printing the current cross-sectional layer among the feeding devices on both sides of the component platform is replenished with powder material.

[0192] Please continue reading Figure 7 In step S730, the moving mechanism in the radiation device is controlled to move the multiple energy beam emitters and the scraper mechanism arranged along the printing surface as a whole, so that during the movement, the scraper mechanism lays the supplemented powder material in the gap.

[0193] Here, the moving mechanism is moved from one side of the printing surface to the other side. Since the scraper mechanism and the multiple energy beam emitters are both arranged on the moving mechanism, the scraper mechanism and the multiple energy beam emitters are driven to move from one side of the printing surface to the other side during the movement of the moving mechanism. During the movement, the scraper mechanism lays the powder material supplemented by the feeding device in the gap between the printing surface and the component platform.

[0194] In step S740, during the movement, the arranged multiple energy beam emitters are controlled to selectively irradiate the laid powder material according to the acquired cross-sectional image to form a cross-sectional layer corresponding to the cross-sectional image.

[0195] Here, in the process that the moving mechanism drives the scraper mechanism and the multiple energy beam emitters to move from one side of the printing surface to the other side, the multiple arranged energy beam emitters selectively radiate the powder material laid by the scraper mechanism in the gap between the printing surface and the component platform according to the acquired cross-sectional image, thereby obtaining a cross-sectional layer corresponding to the cross-sectional image.

[0196] It should be understood that the selective radiation refers to selecting a corresponding energy beam emitter to emit an energy beam according to the correspondence between each pixel position to be printed in the cross-sectional image and the radiation position on the printing surface, thereby forming a cross-sectional layer corresponding to the cross-sectional image.

[0197] In an exemplary embodiment, the energy beam emitters are arranged in a line.

[0198] In this embodiment, the energy beam emitter includes a laser emission terminal and a galvanometer located on the light path emitted by each laser emission terminal. The galvanometer includes a reflective mirror surface and a rotation mechanism for adjusting the light path to change the angle of the energy beam emitted by the laser emission terminal. The reflective mirror surface is exemplified by a prism or a single-sided reflective mirror.

[0199] Each laser emission terminal in the energy beam emitter is arranged at intervals according to the angle range of the energy beam that the corresponding galvanometer can adjust (also known as the second radiation range), so that the energy radiation device can radiate energy without gaps within the width / length of the entire printing format. Each of the energy beam emitters is located on the same straight line and is arranged in a linear shape. The laser emitted by the laser emission terminal is point-shaped. Each laser emission terminal is controlled to adjust the energy of the output laser beam. For example, the laser emission terminal is controlled to emit a laser beam of preset power and stop emitting the laser beam. For another example, the laser emission terminal is controlled to increase the power of the laser beam and reduce the power of the laser beam. The laser emitted by the laser emission terminal adjusts the radiation angle of the laser beam through the galvanometer to project the laser beam to the ideal position, thereby forming the powder material in the gap between the component platform and the printing surface.

[0200] During the movement of the mobile mechanism of the radiation device, each galvanometer adjusts the angle of the energy beam emitted by the laser emission terminal according to the instantaneous position of the corresponding laser emission terminal, so that the powder material laid in the gap between the component platform and the printing surface is selectively radiated during the movement of the energy beam emitter with the mobile mechanism and point-by-point scanning, forming a cross-sectional layer corresponding to the cross-sectional image. In this process, since there are multiple energy beam emitters, each energy emitter performs a scanning operation at the same time, thereby improving printing efficiency.

[0201] In a possible implementation, during the movement of the moving mechanism, each of the energy beam emitters adjusts the irradiated angle according to the correspondence between the instantaneous position of the movement and the pixel position in the cross-sectional image to perform energy radiation.

[0202] It should be understood that there is a corresponding relationship between each position point on the printing surface and each pixel point in the cross-sectional image. During printing, each energy beam emitter selectively radiates the powder material according to the cross-sectional image and the corresponding relationship to form a cross-sectional layer corresponding to the cross-sectional image. Here, since the energy beam emitter can adjust the emission angle of its energy beam by adjusting the galvanometer, when the energy beam emitter moves to the corresponding instantaneous position, the radiation angle of the energy beam emitter can be adjusted to radiate on the printing surface according to the pixel position of each pixel point in the cross-sectional image.

[0203] In an exemplary embodiment, the radiation device is controlled to move from one side of the printing surface to the other side. During the movement of the radiation device, the angle of at least one energy beam emitted by the radiation device is adjusted according to the instantaneous position of the radiation device so as to scan the printing surface according to the cross-sectional image.

[0204] Here, the arranged energy beam emitters are driven by the moving mechanism of the radiation device to move as a whole from one side of the printing surface to the other side. During the movement, the radiation range of each energy beam emitter of the radiation device can cover the entire printing surface. Among them, one side of the printing surface and the other side of the printing surface are based on the printing length / printing width of the printing surface. Taking the printing surface as a rectangle as an example, if the radiation device moves along the printing length direction, it moves from one side of the short side of the printing surface to the other side of the short side of the printing surface; if the radiation device moves along the printing width direction, it moves from one side of the long side of the printing surface to the other side of the long side of the printing surface.

[0205] The instantaneous position is the position of the radiation device at a certain moment during the movement. In one embodiment, the instantaneous position is determined according to the initial position and moving speed of the radiation device. For example, taking the continuous movement of the radiation device as an example, after the moving mechanism of the radiation device starts working, the time difference from the current time to the start time of the work is known, and the instantaneous position of the radiation device can be determined by the initial position and moving speed of the radiation device. In order to ensure that the radiation device selectively radiates energy while continuously moving, the moving speed v and the adjustment of the energy beam angle θ satisfy v=tanθ·d, where d represents the emission speed of the energy beam, so that the contour accuracy of the cross-section obtained by radiation meets the design requirements. In another embodiment, the instantaneous position can also be provided by a sensor arranged on the moving route of the radiation device. For example, taking the intermittent movement or continuous movement of the radiation device as an example, a displacement sensor is arranged on the moving route of the radiation device, and when the radiation device reaches the position of a certain sensor, the induction is triggered to determine the instantaneous position of the radiation device. In another embodiment, the instantaneous position can also be provided by a sensor arranged on the radiation device. For example, a displacement sensor is provided on the radiation device, and the radiation device can determine the instantaneous position of the radiation device according to data provided by the displacement sensor.

[0206] Here, the moving mechanism of the radiation device moves from one side of the printing surface to the other side, and the multiple energy beam emitters arranged on the moving mechanism move along the printing surface from one side to the other side with the moving mechanism and radiate energy to the printing surface during the movement. During the movement, each time the moving mechanism moves to a position, each energy beam emitter can scan the printing surface within the range that its energy can radiate at this position. Based on this, during the movement of the moving mechanism, each energy beam emitter adjusts the angle of the emitted energy beam according to the instantaneous position it passes through, thereby scanning the range that can be radiated at the instantaneous position. Among them, the method of adjusting the angle of the emitted energy beam can be achieved by adjusting the galvanometer in the energy beam emitter.

[0207] Since the present application requires the mobile mechanism and the energy beam emitter to work together to complete the printing task, if the mobile mechanism moves too fast, the energy beam emitter cannot complete the scanning task during the movement; if the mobile mechanism moves too slowly, the printing efficiency is affected. Therefore, the mobile mechanism and the energy beam emitter should be configured so that the energy beam emitter can just print the entire cross-sectional image to form a cross-sectional layer during the movement of the mobile mechanism. To this end, on the one hand, it is necessary to reasonably control the moving speed of the mobile mechanism so that its moving speed meets the printing speed of each energy beam emitter; on the other hand, it is also necessary to determine the radiation position corresponding to each pixel position in the cross-sectional image at each instantaneous position within the range that can be scanned by each energy beam emitter, so as to reasonably plan the printing strategy.

[0208] In a possible implementation, first, the pixel positions of the cross-sectional image within the range that can be scanned by each energy beam emitter at the instantaneous position and their corresponding radiation positions are determined, and then the angle of the energy beam emitted by the energy beam emitter at the instantaneous position is adjusted so that the energy beam radiates to the determined radiation position.

[0209] Specifically, since each pixel in the cross-sectional image corresponds to each position in the printing surface, firstly, according to the radiation range (i.e., the scannable range) of each energy beam emitter at the instantaneous position, the pixel positions included in the corresponding range in the cross-sectional image and the radiation positions corresponding to the range in the printing surface are determined, and then each energy beam reflector is set at the instantaneous position to emit energy to the radiation positions according to the pixel positions in the cross-sectional image. Assuming that the pixel points that need to be scanned in the cross-sectional image are black points and the pixel points that do not need to be scanned are white points, each energy beam emitter adjusts the galvanometer according to the black point pixel positions in the range so that the laser beam projects energy to the radiation positions of these black point pixel positions corresponding to the printing surface, so as to form the powder material in the gap between the component platform and the printing surface into a cross-sectional layer corresponding to the cross-sectional image.

[0210] The printing process of the radiation device in this embodiment at a certain instantaneous position will be described below by using an example.

[0211] In this embodiment, the energy beam emitters can adjust the radiation angle to produce a cross-sectional layer perpendicular to the moving direction. Assuming that a straight line perpendicular to the moving direction of the moving mechanism needs to be printed in a cross-sectional layer (i.e., the cross-sectional image includes the straight line), firstly, the corresponding pixel range of each scanning range mapped in the cross-sectional image is determined according to the scanning range of each energy beam emitter at each instantaneous position during the movement process, so as to determine the pixel position of the straight line to be printed in each pixel range, and the radiation position of each pixel position of the straight line corresponding to the printing surface. During the movement of the moving mechanism, when the corresponding instantaneous position is reached, each energy beam emitter is controlled to emit a laser beam to the radiation position corresponding to the instantaneous position, so that the powder material in the gap between the component platform and the printing surface is formed to form the straight line.

[0212] In one embodiment, the straight line can be divided into a number of line segments according to the radiation range of each of the energy beam emitters, each line segment is configured to be printed by a different energy beam emitter, and each line segment is further divided into a number of printing points, so that each energy beam emitter is controlled to radiate energy to part of the printing points in the corresponding line segment at different instantaneous positions, thereby completing the printing of the entire straight line after passing through multiple instantaneous positions.

[0213] In an exemplary embodiment, to further improve printing efficiency, the energy radiated by the radiation device may be linear or planar. For example, each of the energy beam emitters may be arranged in a planar array. The planar array includes: a matrix-arranged dot-array planar array formed according to the moving direction, or a staggered dot-array planar array formed according to the moving direction.

[0214] In one embodiment, a plurality of energy beam emitters form a matrix-arranged dot-matrix surface array according to the moving direction of the moving mechanism, and each energy beam emitter in the surface array adjusts the energy and switch of the output energy beam in a controlled manner, so that the surface array adjusts its projection format according to the cross-sectional image. During the movement of the moving mechanism, the surface array shapes the powder material in the gap between the component platform and the printing surface in a surface exposure manner to form a cross-sectional layer corresponding to the cross-sectional image. In some cases, since the format of the surface array cannot cover the entire area to be printed in one projection process, the surface array and the moving mechanism can be configured as follows: when the moving mechanism moves a preset distance, the surface array radiates energy to the gap between the component platform and the printing surface to selectively radiate the powder material in the area, and after the surface array completes the printing task of the area, the moving mechanism continues to move a preset distance so that the surface array completes the printing task of the next area. The size of the preset distance can be determined according to the size of the surface array and the energy of each energy beam emitter, so that the printing of the cross-sectional layer is complete and the degree of curing of each area is even.

[0215] In another embodiment, a plurality of energy beam emitters are staggered and arranged into a dot matrix array according to the moving direction of the moving mechanism. The laser beam radiated by the radiating device is linear, and each linear laser beam is composed of point lasers emitted by a plurality of energy beam emitters arranged along a straight line. The energy beam emitters arranged along the same straight line are defined as an energy beam emission group, and each energy beam emitter in the energy beam emission group is controlled to adjust the switch and energy size of the output laser beam, and the powder material scanned by the laser beam of the energy beam emission group is solidified into a corresponding cross-sectional layer.

[0216] It should be understood that since the energy beam emitter is relatively large, staggering multiple energy beam emitters can take into account both the installation space and the radiation surface. The specific form of the staggered arrangement can be determined according to actual needs, for example, it can be a parallelogram lattice array, or a hexagonal lattice array with protruding sides, or a hexagonal lattice array with concave sides, etc.

[0217] Here, in order to ensure the printing efficiency, the arrangement of the surface array formed by the energy beam emitters or the arrangement of the surface array formed by the energy beam emitters should be set according to the moving direction of the moving mechanism. For example, in order to avoid repeated movement of the moving device, the surface array is configured to have a format that can at least cover the vertical direction of the moving direction of the moving mechanism, so that the printing of a cross-section layer can be completed in one stroke of the moving mechanism.

[0218] In an exemplary embodiment, the radiation device is controlled to move from one side of the printing surface to the other side.

[0219] Here, the energy beam emitters are driven to move from one side of the printing surface to the other side by the control mechanism of the radiation device. During the movement, the radiation range of each energy beam emitter of the radiation device can cover the entire printing surface.

[0220] During the movement of the radiation device, at least one energy beam is selectively emitted according to the correspondence between the instantaneous position of the radiation device and the pixel position of the cross-sectional image, so as to scan the printing surface according to the cross-sectional image, that is, each energy beam emitter selectively radiates energy according to the correspondence between the instantaneous position of the movement and the pixel position of the cross-sectional image.

[0221] It should be understood that the radiation position of the energy emitted by each energy beam emitter on the printing surface is determined according to the position of each energy beam emitter on the printing surface, and each radiation position on the printing surface corresponds to a pixel position in the cross-sectional image.

[0222] Therefore, in one embodiment, for example, when the surface array formed by the arrangement of energy beam emitters is used to form the powder material in the gap between the component platform and the printing surface by surface exposure, during the movement of the radiation device, the instantaneous position of the surface array formed by multiple energy beam emitters and the radiation position of each energy beam emitter in the surface array can be mapped to the pixel position in the cross-sectional image, and the surface array can be controlled to project onto the printing surface according to the cross-sectional image.

[0223] In another embodiment, for example, when a plurality of energy beam emitters of the radiation device are staggered to form a dot matrix array, during movement, each of the energy beam emitters selectively radiates energy according to the correspondence between the instantaneous position of the movement and the pixel position of the cross-sectional image.

[0224] Here, during the movement of the radiation device, each energy beam emitter selectively emits an energy beam according to each instantaneous position it passes through during the movement, the radiation position corresponding to each energy beam emitter at the instantaneous position, and the pixel position mapped to each radiation position in the cross-sectional image. Assuming that the pixel points that need to be scanned in the cross-sectional image are black points, and the pixel points that do not need to be scanned are white points, when the radiation position corresponding to an energy beam emitter at a certain instantaneous position is mapped to a black point in the cross-sectional image, the energy beam emitter is controlled to emit an energy beam to the printing surface, thereby scanning on the printing surface according to the cross-sectional image.

[0225] The printing process of the radiation device in this embodiment at a certain instantaneous position will be described below by using an example.

[0226] Here, a cross-sectional layer perpendicular to the moving direction can be manufactured by selective energy radiation of each of the energy beam emitters. Assuming that a straight line perpendicular to the moving direction of the moving mechanism needs to be printed in a cross-sectional layer (i.e., the cross-sectional image includes the straight line), first, according to each instantaneous position of each energy beam emitter during the movement process, the radiation position of each energy beam emitter at each instantaneous position is determined, and the radiation position of the pixel position to be printed on the printing surface is determined through the mapping relationship between the radiation position and the pixel position in the cross-sectional image. In the process of the moving mechanism moving along the working surface, when it moves to the corresponding instantaneous position, the corresponding energy beam emitter is controlled to emit energy to the radiation position.

[0227] In one embodiment, the straight line can be divided into a number of line segments according to the radiation range of each energy beam emission group, each line segment is configured to be printed by a different energy beam emission group, and each line segment is further divided into a number of printing points, so as to control each energy beam emitter in the energy beam emission group to emit energy to the corresponding printing point when reaching the corresponding instantaneous position.

[0228] In an exemplary embodiment, the radiation range of the radiation device within the travel range of the moving mechanism is defined as the first radiation range, and the range scanned by the corresponding energy beam emitter or the range of the energy beam emitted by the corresponding energy beam emitter is defined as the second radiation range, that is, the second radiation range is the range that the energy of a single energy beam emitter can reach. Then the first radiation range should cover the printing width and printing length of the entire printing surface, so as to completely print the cross-sectional layer corresponding to the cross-sectional image based on the acquired cross-sectional image. Each of the energy beam emitters is arranged at intervals according to its own second radiation range, so that the sum of the second radiation ranges of each energy beam emitter can cover the printing width and printing length of the entire printing surface.

[0229] In an exemplary embodiment, the 3D printing device further includes a preheating device that moves as a whole with the scraper mechanism, and the control method further includes: controlling the preheating device to preheat the laid powder material for selective radiation treatment by the arranged multiple energy beam emitters.

[0230] It should be understood that preheating the powder material to a temperature slightly lower than its melting point can help improve the molding efficiency and quality of the powder material during printing. The preheated powder material is selectively irradiated by each energy beam emitter according to the cross-sectional image to obtain a cross-sectional layer, and bonded to the formed part. After one layer is printed, the next layer is preheated and printed. After all printing is completed, the excess powder is removed to obtain a 3D printed component.

[0231] In a possible embodiment, the preheating device includes a heating element, which is used to preheat the powder material so as to facilitate its molding after being irradiated by the energy beam radiator. For example, the heating element can be a light source with a controllable range, and examples of the light source include but are not limited to infrared, semiconductor laser, and other light sources that can heat a partial area.

[0232] In an exemplary embodiment, for a radiation device in which a plurality of energy beam emitters are arranged on a moving mechanism and are all located on one side of a scraper mechanism, the preheating device may be arranged between the scraper mechanism and the plurality of energy beam emitters. During the movement of the moving mechanism, the scraper mechanism, the preheating device, and the plurality of energy beam emitters arranged on the moving mechanism move with the moving mechanism. After the scraper mechanism scrapes the powder material in the feeding device into the molding cavity and lays it in the gap between the component platform and the printing surface, the preheating device can preheat the powder material. The preheated powder material is selectively irradiated by the radiation device to form a cross-sectional layer corresponding to the cross-sectional image, thereby completing the powder laying, preheating, and printing of a cross-sectional layer in one movement process.

[0233] Since the above embodiment is only provided with a preheating device and a plurality of energy beam emitters on one side of the scraper, during the printing process, only when the moving direction of the moving mechanism is opposite to the direction of the preheating device and the plurality of energy beam emitters relative to the scraper, the powder spreading, preheating and radiation forming operations of the cross-section layer can be completed during the movement of the scraper mechanism from one side of the printing surface to the other side. After completing the operation of a cross-section layer, it is necessary to control the moving mechanism to drive the scraper mechanism, the preheating device and the plurality of energy beam emitters to return to the starting side, and then print the next layer.

[0234] In another embodiment, in order to further improve the printing efficiency, the preheating device is symmetrically arranged on both sides of the scraper mechanism; during the movement, the preheating device following one side of the scraper mechanism performs the preheating operation.

[0235] Specifically, the multiple energy beam emitters in the radiation device constitute two symmetrical radiation modules, and the two symmetrical radiation modules are respectively located on both sides of the scraper mechanism; the preheating device includes two heating modules, and the two heating modules are respectively located between the two radiation modules and the scraper mechanism. During the movement of the moving mechanism, the heating module on the side opposite to the moving direction of the moving mechanism preheats the powder material after the scraper mechanism scrapes the powder material in the feeding device into the molding cavity and lays it in the gap between the component platform and the printing surface. After preheating, the multiple energy beam emitters in the radiation module on the side opposite to the moving direction of the moving mechanism selectively radiate the powder material to form a cross-sectional layer corresponding to the cross-sectional image. For example, when the starting position of the moving mechanism is on the right side of the printing surface, in the process of the moving mechanism moving from the right side of the printing surface to the left side of the printing surface (that is, the moving direction of the moving mechanism is to the left), the scraper mechanism scrapes the powder material in the feeding device into the molding cavity and lays it in the gap between the component platform and the printing surface, and the heating module located on the right side of the scraper mechanism preheats the powder material laid in the gap between the component platform and the printing surface. After preheating, a plurality of arranged energy beam radiators located on the right side of the scraper mechanism selectively radiate the powder material laid in the gap between the component platform and the printing surface, thereby forming a cross-sectional layer corresponding to the cross-sectional image. On the contrary, when the starting position of the moving mechanism is on the left side of the printing surface, in the process of the moving mechanism moving from the left side of the printing surface to the right side of the printing surface (that is, the moving direction of the moving mechanism is to move to the right), the scraper mechanism scrapes the powder material in the feeding device into the molding cavity and lays it in the gap between the component platform and the printing surface, and the heating module located on the left side of the scraper mechanism preheats the powder material laid in the gap between the component platform and the printing surface. After preheating, a plurality of arranged energy beam radiators located on the left side of the scraper mechanism selectively radiate the powder material laid in the gap between the component platform and the printing surface, thereby forming a cross-sectional layer corresponding to the cross-sectional image.

[0236] In step S750, the order of each cross-sectional image of the three-dimensional object model is obtained in sequence, and steps S710 to S740 are repeated to manufacture the corresponding three-dimensional object layer by layer.

[0237] Here, according to the printing order of each cross-sectional image of the three-dimensional object model, steps S710 to S740 are repeated to print the cross-sectional layers corresponding to each cross-sectional image one by one, so that each cross-sectional layer is accumulated on the component platform to obtain a three-dimensional object.

[0238] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0239] In an exemplary embodiment, the control method in the embodiment of the fourth aspect of the present application can also be executed by a control device of a 3D printing device. To this end, an embodiment of the fifth aspect of the present application also provides a control device of a 3D printing device.

[0240] See also Figure 8 , which is a schematic diagram of a control device of a 3D printing device in one embodiment of the present application. Figure 8 As shown, the control device 8 includes an interface unit 81, a storage unit 82, and a processing unit 83. The storage unit 82 includes a non-volatile memory, a volatile memory, etc. The non-volatile memory is exemplified by a solid state drive or a USB flash drive. The storage server is used to store at least one program. The interface unit 81 includes a network interface, a data line interface, a circuit interface, etc. The network interface includes but is not limited to: an Ethernet network interface device, a network interface device based on a mobile network (3G, 4G, 5G, etc.), a network interface device based on short-range communication (WiFi, Bluetooth, etc.). The data line interface includes but is not limited to: a USB interface, RS232, etc. The interface unit is connected to the Z-axis moving system, the feeding device, the scraper mechanism, the radiation device, and other 3D printing devices that are independently packaged and transmit data or drive work through the interface. The processing unit 83 connects the interface unit 81 and the storage unit 82, and includes: at least one of a CPU or a chip integrated with a CPU, a programmable logic device (FPGA), and a multi-core processor. The processing unit 83 also includes a memory, a register, and other memories for temporarily storing data.

[0241] The interface unit 81 is used to communicate data with the radiation device in the 3D printing device, and is electrically connected to the Z-axis movement system, the material feeding device, and the scraper mechanism to control the operation of the Z-axis movement system, the material feeding device, and the scraper mechanism.

[0242] The storage unit 82 is used to store at least one program. Here, the storage unit 82 includes, for example, a solid state drive and stores the at least one program.

[0243] The processing unit 83 is used to call the at least one program to coordinate the interface unit and the storage unit to execute the control method of the 3D printing device mentioned in the embodiment of the fourth aspect. Figure 7 As shown in the corresponding description, it will not be repeated here.

[0244] It should be understood that the control device may be provided independently of the 3D printing device and connected to various devices in the 3D printing device through various interfaces of the interface unit, or may be integrated in the 3D printing device.

[0245] Based on this understanding, a 3D printing system is provided in an embodiment of the sixth aspect of the present application.

[0246] The 3D printing system includes the 3D printing device as mentioned in the third aspect of the present application, and the control device as mentioned in the fifth aspect of the present application. Figure 6 As shown in the corresponding description, the control device is as follows Figure 8 As shown in the corresponding description, it will not be repeated here.

[0247] The control device is connected to each device in the 3D printing device through its interface unit, thereby providing the radiation device with a cross-sectional image of each layer printed, and driving the Z-axis movement system, the feeding device, the scraper mechanism, and the radiation device to work together so that the 3D printing device selectively radiates the powder material laid in the gap between the component platform and the printing surface of the 3D printing device according to the acquired cross-sectional image to form a cross-sectional layer corresponding to the cross-sectional image.

[0248] It should be noted that, through the description of the above implementation methods, those skilled in the art can clearly understand that part or all of the present application can be implemented with the help of software and in combination with the necessary general hardware platform. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product, based on which, the present application further provides a computer-readable and writable storage medium on which a computer program of a control method of a radiation device is stored, and when the computer program storing the control method of the radiation device is executed by a processor, the steps of the control method of the radiation device are implemented.

[0249] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the various embodiments of the present application.

[0250] In the embodiments provided in the present application, the computer readable and writable storage medium may include a read-only memory (ROM), a random access memory (RAM), an EEPROM, a CD-ROM or other optical disk storage device, a magnetic disk storage device or other magnetic storage device, a flash memory, a USB flash drive, a mobile hard disk, or any other medium that can be used to store the desired program code in the form of an instruction or data structure and can be accessed by a computer. In addition, any connection can be appropriately referred to as a computer-readable medium. For example, if the instruction is sent from a website, a server or other remote source using a coaxial cable, an optical fiber cable, a twisted pair, a digital subscriber line (DSL), or wireless technologies such as infrared, radio and microwaves, the coaxial cable, optical fiber cable, twisted pair, DSL, or wireless technologies such as infrared, radio and microwaves are included in the definition of the medium. However, it should be understood that computer readable and writable storage media and data storage media do not include connections, carriers, signals or other temporary media, but are intended to be non-temporary, tangible storage media. Disk and disc, as used in this application, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers.

[0251] The present application can be used in many general or special computing system environments or configurations, such as personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronic devices, network PCs, minicomputers, mainframe computers, and distributed computing environments including any of the above systems or devices.

[0252] The present application may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer-readable storage media, including storage devices.

[0253] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A radiation device for 3D printing equipment, characterized in that: include: A moving mechanism, used for moving along a printing surface of the 3D printing device; A plurality of energy beam emitters are arranged and disposed as a whole on the moving mechanism, and are used to selectively radiate the powder material laid in the gap between the component platform and the printing surface of the 3D printing device according to the acquired cross-sectional image during the movement along the printing surface, so as to form a cross-sectional layer corresponding to the cross-sectional image; During the movement of the mobile mechanism, each of the energy beam emitters adjusts the irradiated angle according to the correspondence between the instantaneous position of the movement and the pixel position in the cross-sectional image to radiate energy; the instantaneous position is determined according to the initial position and moving speed of the radiation device or is provided by a sensor arranged on the moving route of the radiation device.

2. The radiation device according to claim 1, characterized in that The energy beam emitters are arranged in a line or in a planar array.

3. The radiation device according to claim 2, characterized in that: The surface array includes: a dot-matrix surface array formed in a matrix arrangement according to a moving direction, or a dot-matrix surface array formed in a staggered arrangement according to a moving direction.

4. The radiation device according to claim 1, characterized in that: The first radiation range of the radiation device covers the printing width or printing length of the printing surface.

5. The radiation device according to claim 1, characterized in that: The energy beam emitter comprises a laser emission terminal and a galvanometer; wherein, during movement, each galvanometer adjusts the angle of the energy beam emitted by the laser emission terminal according to the instantaneous position of the corresponding laser emission terminal.

6. The radiation device according to claim 1, characterized in that: The energy beam emitters are arranged at intervals according to their respective second radiation ranges.

7. The radiation device according to claim 6, characterized in that The second radiation range includes: a range scanned by a corresponding energy beam transmitter or a range of an energy beam emitted by a corresponding energy beam transmitter.

8. The radiation device according to claim 1, characterized in that: The energy beam emitters adjust the radiation angle to produce a cross-section layer perpendicular to the moving direction.

9. The radiation device according to claim 1, characterized in that: During the movement, each of the energy beam emitters selectively radiates energy according to the correspondence between the instantaneous position of the movement and the pixel position of the cross-sectional image.

10. The radiation device according to claim 9, characterized in that The energy beam emitters selectively irradiate energy to produce a cross-section layer perpendicular to the moving direction.

11. The radiation device according to claim 1, characterized in that The energy radiated by the energy beam emitter is light energy.

12. The radiation device according to claim 1, characterized in that Also included is an energy source connected to each energy beam emitter.

13. A powder spreading device for 3D printing equipment, characterized in that: The powder spreading device comprises: The radiation device according to any one of claims 1 to 12; and The scraper mechanism is arranged on the moving mechanism of the radiation device and moves integrally with the arranged multiple energy beam emitters to lay the powder material in the gap between the component platform and the printing surface of the 3D printing device.

14. The powder spreading device according to claim 13, characterized in that: It also includes a preheating device, which is arranged on the moving mechanism of the radiation device and is used to preheat the laid powder material so that the multiple arranged energy beam emitters can radiate the preheated powder material in the gap.

15. The powder spreading device according to claim 14, characterized in that: The preheating devices are symmetrically arranged on both sides of the scraper mechanism; during the movement, the preheating device following one side of the scraper mechanism performs a preheating operation.

16. The powder spreading device according to claim 13, characterized in that: The radiation device is symmetrically arranged on both sides of the scraper mechanism; during movement, a plurality of energy beam emitters arranged to follow one side of the scraper mechanism perform radiation operations.

17. A 3D printing device, characterized in that: Used to manufacture a three-dimensional object using powder material, wherein the 3D printing device comprises: A component platform, used to carry three-dimensional objects manufactured layer by layer; A Z-axis moving mechanism, used for driving the component platform to move so that the gap between the component platform and the printing surface is filled with powder material; A feeding device, disposed on at least one side of the component platform, for providing powder material for manufacturing a cross-sectional layer of the three-dimensional object; A powder spreading device as described in any one of claims 13-16.

18. The 3D printing device according to claim 17, characterized in that: The feeding devices are symmetrically arranged on both sides of the component platform.

19. The 3D printing device according to claim 17, characterized in that: A molding cavity is also included, wherein the component platform moves in the molding cavity.

20. A control method for a 3D printing device as claimed in any one of claims 17 to 19, characterized in that: The 3D printing device comprises: a Z-axis moving mechanism equipped with a component platform, a feeding device, a scraper mechanism and a radiation device, and the control method comprises: Controlling the Z-axis moving mechanism to move so that there is a gap between the component platform and the printing surface of the 3D printing device; Controlling the feeding device to replenish powder material; Controlling the moving mechanism in the radiation device to move the multiple energy beam emitters and the scraper mechanism arranged along the printing surface as a whole, so that during the movement, the scraper mechanism lays the supplemented powder material in the gap; During the movement, the multiple energy beam emitters arranged are controlled to selectively radiate the laid powder material according to the acquired cross-sectional image to form a cross-sectional layer corresponding to the cross-sectional image, and each of the energy beam emitters adjusts the radiated angle to radiate energy according to the correspondence between the instantaneous position of the movement and the pixel position in the cross-sectional image, wherein the instantaneous position is determined according to the initial position and the moving speed of the radiation device or is provided by a sensor arranged on the moving route of the radiation device; The order of obtaining each cross-sectional image of the three-dimensional object model is sequentially repeated, and the above steps are repeated to manufacture the corresponding three-dimensional object layer by layer.

21. The control method of the 3D printing device according to claim 20, characterized in that: The 3D printing device also includes a preheating device that moves as a whole with the scraper mechanism, and the control method also includes: controlling the preheating device to preheat the laid powder material for selective radiation treatment by the arranged multiple energy beam emitters.

22. The control method of the 3D printing device according to claim 20, characterized in that: The first radiation range of the radiation device covers the printing width or printing length of the printing surface.

23. The control method of the 3D printing device according to claim 20, characterized in that: The energy beam emitters adjust the radiation angle to produce a cross-section layer perpendicular to the moving direction.

24. The control method of the 3D printing device according to claim 20, characterized in that: The step of controlling the arranged multiple energy beam emitters to selectively irradiate the laid powder material according to the acquired cross-sectional image includes: during movement, each of the energy beam emitters selectively radiates energy according to the correspondence between the instantaneous position of the movement and the pixel position of the cross-sectional image.

25. The control method of the 3D printing device according to claim 24, characterized in that: The energy beam emitters selectively irradiate energy to produce a cross-section layer perpendicular to the moving direction.

26. The control method of the 3D printing device according to claim 20, characterized in that: The energy beam emitters are arranged at intervals according to their respective second radiation ranges.

27. The control method of the 3D printing device according to claim 26, characterized in that: The second radiation range includes: a range scanned by a corresponding energy beam transmitter or a range of an energy beam emitted by a corresponding energy beam transmitter.

28. A control device for a 3D printing device, characterized in that: include: An interface unit, used for data connection with the Z-axis moving mechanism, the feeding device, the scraper mechanism and the radiation device in the 3D printing device; A storage unit, used to store at least one program; A processing unit, used to call the at least one program to coordinate the storage unit and the interface unit to implement the control method as described in any one of claims 20-27.

29. A 3D printing system, characterized in that: include: The 3D printing device as described in any one of claims 17 to 19; as well as A control device as claimed in claim 28.

30. A computer-readable storage medium, characterized in that: At least one program is stored, and when the at least one program is called, the control method according to any one of claims 20-27 is executed.

31. A method for controlling a radiation device according to any one of claims 1 to 12, characterized in that: A radiation device for a 3D printing device, the control method comprising: Controlling the radiation device to move from one side of the printing surface to the other side; During the movement of the radiation device, the angle of at least one energy beam emitted by the radiation device is adjusted according to the instantaneous position of the radiation device so as to scan the printing surface according to the cross-sectional image; the instantaneous position is determined according to the initial position and moving speed of the radiation device or is provided by a sensor arranged on the moving route of the radiation device.

32. The control method of the radiation device according to claim 31, characterized in that: The radiation device comprises a plurality of energy beam emitters arranged; The step of adjusting the angle of at least one energy beam emitted by the radiation device according to the instantaneous position of the radiation device comprises: Determine the positions of each pixel of the cross-sectional image and its corresponding radiation position within the range that can be scanned by each energy beam emitter at the instantaneous position; The angle of the energy beam emitted by the energy beam emitter at the instantaneous position is adjusted so that the energy beam radiates to the determined radiation position.

33. The control method of the radiation device according to claim 32, characterized in that: The energy beam emitters adjust the radiation angle to produce a cross-section layer perpendicular to the moving direction.

34. The control method of the radiation device according to claim 31, characterized in that: The moving speed of the radiation device, the adjusted energy beam angle and the emission speed of the energy beam satisfy that the product of the tangent value of the adjusted energy beam angle and the emission speed of the energy beam is equal to the moving speed of the radiation device.

35. The control method of the radiation device according to claim 31, characterized in that: The radiation device is fixed on the body side of the scraper mechanism of the 3D printing device; the step of controlling the radiation device to move from one side of the printing surface to the other side includes: controlling the scraper mechanism and the radiation device of the 3D printing device to move as a whole from one side of the printing surface to the other side.

36. A method for controlling a radiation device according to any one of claims 1 to 12, characterized in that: A radiation device used in a 3D printing device, the control method comprising: Controlling the radiation device to move from one side of the printing surface to the other side; During the movement of the radiation device, at least one energy beam is selectively emitted based on the correspondence between the instantaneous position of the radiation device and the pixel position of the cross-sectional image, so as to scan the printing surface according to the cross-sectional image; the instantaneous position is determined according to the initial position and moving speed of the radiation device or is provided by a sensor arranged on the moving route of the radiation device.

37. The control method of the radiation device according to claim 36, characterized in that: The radiation device comprises a plurality of energy beam emitters arranged; The step of selectively emitting at least one energy beam according to the correspondence between the instantaneous position of the radiation device and the pixel position of the cross-sectional image comprises: According to the correspondence between the instantaneous position of each energy beam emitter and the pixel position of the cross-sectional image, the corresponding energy beam emitter is controlled to emit the energy beam.

38. The control method of the radiation device according to claim 37, characterized in that: The energy beam emitters selectively irradiate energy to produce a cross-section layer perpendicular to the moving direction.

39. The control method of the radiation device according to claim 36 or 37, characterized in that: The plurality of energy beam emitters form a matrix-arranged dot-matrix surface array or a staggered-arranged dot-matrix surface array according to the moving direction.

40. The control method of the radiation device according to claim 36, characterized in that: The radiation device is fixed on the body side of the scraper mechanism of the 3D printing device; the step of controlling the radiation device to move from one side of the printing surface to the other side includes: controlling the scraper mechanism and the radiation device of the 3D printing device to move as a whole from one side of the printing surface to the other side.

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