Powder bed coating quality detection device and additive manufacturing equipment with same

Abstract

The utility model provides a powder bed coating quality detection device and additive manufacturing equipment with the same, and the powder bed coating quality detection device comprises a mounting part (30) which is mounted in the additive manufacturing equipment; the one or more measuring units (31) are arranged in the preset direction of the mounting part (30) and used for emitting the generated detection beam to a three-dimensional object forming area (21) and capturing the detection beam reflected by the surface of the forming area (21) before and / or after the powder spreading device moves, and distance information mapped by the forming area (21) is obtained; wherein a detection range formed by the one or more measuring units (31) at least partially covers the forming area (21). Each measuring unit (31) can cover different areas of the forming area (21), so that the powder bed thickness and uniformity of the whole forming area (21) can be comprehensively detected, a blind area or a detection error caused by a single view angle is avoided, and the detection accuracy is improved.

Description

Technical Field

[0001] The present application relates to the technical field of additive manufacturing equipment, and more specifically to a powder bed coating quality detection device and an additive manufacturing equipment equipped with the detection device. Background Art

[0002] Additive manufacturing, also known as 3D printing, is a key step in achieving high-precision forming in the development of additive manufacturing technology. The powder bed coating process involves evenly applying powder material to the forming area to facilitate subsequent layer-by-layer curing by laser or other energy sources. The quality of the powder layer during the coating process has a significant impact on the forming effect, especially in high-precision applications. Any minor coating defects or unevenness may lead to performance degradation or failure of the finished product. Therefore, real-time detection of powder bed coating quality is particularly important.

[0003] However, during the additive manufacturing process, various factors, such as debris splashing, uneven accumulation, external environmental changes, and equipment wear, often lead to abnormalities in the coating quality of the building materials. These abnormalities include but are not limited to uneven layer thickness, the appearance of pores or voids, which bring quality risks to the final printing results.

[0004] Currently, the existing methods for evaluating powder bed coating quality usually rely on visual inspection, that is, using high-speed cameras to monitor the material coating quality. However, this technology has some limitations in application, such as being overly sensitive to tiny impurities, limited monitoring accuracy, and poor adaptability to different materials. In addition, the detection effect is sometimes poor, especially when the coating speed is fast or the material layer is thick.

[0005] Therefore, there is an urgent need for a more reliable and accurate powder bed coating quality detection device. Utility Model Content

[0006] The present application provides a powder bed coating quality detection device and an additive manufacturing device equipped with the detection device, which can improve the detection effect of powder bed coating quality and can also provide flatness detection for the forming platform.

[0007] In a first aspect, the present application provides a powder bed coating quality detection device, comprising:

[0008] An installation portion, which is installed in the additive manufacturing equipment;

[0009] One or more measuring units are arranged along a preset direction of the mounting portion, and are used to emit a generated detection beam to a forming area of ​​the three-dimensional object before and / or after the powder spreading device moves, and capture the detection beam reflected by the surface of the forming area to obtain distance information mapped by the forming area;

[0010] The detection range formed by the one or more measurement units at least partially covers the forming area.

[0011] In an optional solution of the first aspect, the mounting portion is horizontally or obliquely arranged on a powder spreading device of the additive manufacturing equipment and is located on at least one side of a movement direction of the powder spreading device.

[0012] In an optional solution of the first aspect, the measuring unit includes one or more laser sensors, and the one or more sensors are used to measure distance information from the detection light beam to multiple positions of the forming area.

[0013] In an optional scheme of the first aspect, a single measuring unit includes a laser sensor, which is arranged on a mounting portion through a linear drive. The laser sensor moves in a first direction following the powder spreading device and moves in a second direction through the linear drive, and is used to sequentially measure the distance information from the detection light beam to multiple positions in the forming area.

[0014] In an optional solution of the first aspect, the mounting portion is provided with a plurality of stepped mounting grooves, and the plurality of stepped mounting grooves are arranged along a preset direction of the mounting portion.

[0015] In an optional solution of the first aspect, the plurality of stepped mounting grooves are arranged in a partially overlapping manner along a preset direction of the mounting portion.

[0016] In an optional solution of the first aspect, a plurality of measurement units are arranged on the mounting portion in a partially overlapping manner along the first direction, and detection ranges of the plurality of measurement units are set to partially overlap.

[0017] In an optional solution of the first aspect, a plurality of measurement units are arranged on the mounting portion in a partially overlapping manner along the second direction, and detection ranges between the plurality of measurement units are set to partially overlap.

[0018] In an optional solution of the first aspect, a plurality of measuring units are arranged on the mounting portion along the first direction and / or the second direction and at preset intervals, and the plurality of measuring units are set to different mounting angles, so that the detection ranges of the plurality of measuring units partially overlap.

[0019] In an optional solution of the first aspect, the mounting portion is provided with a plurality of mounting grooves with different angles, and the plurality of mounting grooves are arranged along a second preset direction of the mounting portion.

[0020] In an optional solution of the first aspect, a plurality of measuring units are arranged on the mounting portion along a second preset direction and at different angles, and detection ranges of the plurality of measuring units are set to partially overlap.

[0021] In an optional solution of the first aspect, a plurality of measuring units are arranged on the mounting portion along a second preset direction and at different angles, and the plurality of measuring units are configured to partially overlap, so that the detection ranges of the plurality of measuring units partially overlap.

[0022] In a second aspect, the present application provides an additive manufacturing device equipped with the powder bed coating quality detection device.

[0023] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate one or more embodiments of the present application and, together with the description, serve to explain the principles of the present application and to enable one of ordinary skill in the relevant art to make and use the present application.

[0025] Figure 1 This is a schematic diagram of a first direction setting of an exemplary measurement unit according to some embodiments of the present application.

[0026] Figure 2 This is a schematic diagram of a second direction setting of an exemplary measurement unit according to some embodiments of the present application.

[0027] Figure 3 is a schematic diagram of a first double-sided setting of an exemplary measurement unit according to some embodiments of the present application.

[0028] Figure 4 3 is a schematic diagram of a second double-sided setting of an exemplary measurement unit according to some embodiments of the present application.

[0029] Figure 5 This is a schematic diagram of a first-direction installation of an exemplary measuring unit according to some embodiments of the present application.

[0030] Figure 6 This is a schematic diagram of a second-direction installation of an exemplary measuring unit according to some embodiments of the present application.

[0031] Figure 7 This is a schematic diagram of a first direction angle adjustment setting of an exemplary measurement unit according to some embodiments of the present application.

[0032] Figure 8 This is a schematic diagram of a first direction angle adjustment installation of an exemplary measuring unit according to some embodiments of the present application.

[0033] Figure 9This is a schematic diagram of a second direction angle adjustment setting of an exemplary measuring unit according to some embodiments of the present application.

[0034] Figure 10 This is a schematic diagram of the second direction angle adjustment installation of an exemplary measuring unit according to some embodiments of the present application.

[0035] Figure 11 This is a schematic diagram of a first double-sided angle adjustment setting of an exemplary measuring unit according to some embodiments of the present application.

[0036] Figure 12 This is a schematic diagram of a second double-sided angle adjustment installation of an exemplary measuring unit according to some embodiments of the present application.

[0037] Figure 13 This is a schematic diagram of the first direction angle adjustment installation of the Z-axis direction of an exemplary measuring unit according to some embodiments of the present application.

[0038] Figure 14 This is a schematic diagram of the second direction angle adjustment installation of the Z-axis direction of an exemplary measuring unit according to some embodiments of the present application.

[0039] Figure 15 This is a schematic diagram of an exemplary Z-axis direction double-sided angle adjustment installation of a measuring unit according to some embodiments of the present application.

[0040] Figure 16 is a schematic diagram of the installation of an exemplary single laser measurement device according to some embodiments of the present application. DETAILED DESCRIPTION

[0041] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of the embodiments of this application.

[0042] "At least one item" or similar expressions in the embodiments of the present application refers to any combination of these items, including any combination of single items or multiple items, and refers to one or more, and multiple refers to two or more.

[0043] In order to make the purpose, technical solutions and advantages of this application more clear, the following will further describe the embodiments of this application in detail with reference to the accompanying drawings. In the accompanying drawings, the same reference numerals represent the same or functionally similar elements.

[0044] To facilitate understanding, a brief introduction is first given to the powder spreading device and the forming platform 20 of the additive manufacturing equipment.

[0045] The powder spreading device evenly spreads the powder material on the forming platform 20 to form a powder bed with uniform thickness and density, providing an ideal material base for subsequent layered additive forming; the powder spreading device usually includes a powder feeding system, a powder dispenser, a powder spreading head 10 and a corresponding control system; the powder spreading head 10 is a component that is in direct contact with the forming platform 20, and is responsible for spreading the powder material evenly on the platform according to a preset thickness. The powder spreading head 10 usually has an adjustment mechanism that can adjust the powder spreading speed and powder spreading thickness according to different process requirements. The types of powder spreading heads 10 include rollers, scrapers and knife-edge powder spreading heads 10, etc.

[0046] The working principle of the powder spreading device is: powder is obtained from the powder feeding system, the powder flow is adjusted by the powder distributor and sent to the powder spreading head 10, and the powder spreading head 10 spreads the powder material evenly on the forming platform 20 to form a flat powder layer. The thickness of this layer is usually between tens and hundreds of microns, depending on the equipment and process requirements; during the powder spreading process, the control system accurately controls the moving speed and height of the powder spreading head 10 through a closed-loop feedback mechanism to ensure the uniformity of the powder layer.

[0047] The forming platform 20 is typically made of a highly rigid material to ensure it does not significantly deform under prolonged, high-temperature heating. Common forming platform 20 materials include aluminum alloy, stainless steel, and ceramics. It is often designed with an internal heating or cooling system to help maintain a stable platform temperature. The forming platform 20 remains stationary during the powder laying process and moves downward a set distance based on the preset layer thickness after each layer of powder is laid to make room for the next layer. The movement of the forming platform 20 is typically highly precise to ensure parallelism and consistent thickness between layers.

[0048] Therefore, in order to achieve the purpose of the present application of "providing a more reliable and accurate powder bed coating quality detection device", the embodiment of the present application provides a powder bed coating quality detection device for use in additive manufacturing equipment, which uses optical measurement technology to detect the flatness of the powder bed coating in the additive manufacturing equipment. For example, the detection device can be constructed as a part of the additive manufacturing equipment, or used in conjunction with the additive manufacturing equipment. In the former case, the detection device is regarded as a part of the additive manufacturing equipment, and the components it covers are also components of the additive manufacturing equipment. Similarly, some components covered by the additive manufacturing equipment can also be used by the detection device of the present application.

[0049] Figure 1 Schematic diagram of the first direction setting measurement unit of the powder bed coating quality detection device of the present application. Figure 1 As shown, in some embodiments of the present application, the detection device of the present application includes a mounting portion 30, one or more measuring units 31 and a control unit.

[0050] The mounting portion 30 can be installed anywhere in the additive manufacturing equipment, including but not limited to the forming bin, powder laying head 10 and other locations, as long as it can install one or more measuring units 31 for the measuring unit 31 to detect the information of the forming area 21 of the forming platform 20, and can be installed and fixed by the operator according to actual needs.

[0051] For example, in this application, the reference mounting portion 30 is mounted on the powder spreading head 10 of the powder spreading device, that is, the mounting portion 30 is horizontally or tiltedly arranged on the powder spreading head 10 of the powder spreading device of the additive manufacturing equipment, and the mounting portion 30 is located on at least one side of the movement direction of the powder spreading head 10; in the actual implementation process, the reference mounting portion 30 is mounted on the powder spreading head 10 of the powder spreading device of the additive manufacturing equipment. Figure 2 As shown, Figure 2 A schematic diagram of the second direction setting measurement unit of the powder bed coating quality detection device of the present application is shown. If it is necessary to detect the forming area 21 before the powder laying head 10 moves, it is installed on the same side of the movement direction of the powder laying head 10; Figure 1 As shown, if it is necessary to detect the forming area 21 after the powder spreading head 10 moves, it is installed on the opposite side of the movement direction of the powder spreading head 10; Figure 3 and Figure 4 As shown, Figure 3 Schematic diagram showing the first double-sided measurement unit of the powder bed coating quality detection device of the present application, Figure 4 A schematic diagram of the second double-sided measuring unit of the powder bed coating quality detection device of the present application is shown. If it is necessary to detect the forming area 21 before and after the movement of the powder laying head 10, it is installed on the same side and opposite side of the movement direction of the powder laying head 10.

[0052] One or more measuring units 31 are arranged along a preset direction of the mounting portion 30 and are used to emit the generated detection beam to the three-dimensional object forming area 21 and capture the detection beam reflected by the surface of the forming area 21 before and / or after the powder spreading device moves, so as to obtain the distance information mapped by the forming area 21; wherein the detection range formed by the one or more measuring units 31 at least partially covers the forming area 21.

[0053] refer to Figure 1 In some embodiments, a plurality of measuring units 31 are provided, and the plurality of measuring units 31 are arranged in an array along a first direction of the mounting portion 30 , and the measuring units 31 include one or more laser sensors, and the one or more laser sensors are used to measure distance information from a detection light beam to multiple positions of the forming area 21 .

[0054] refer to Figure 2In some embodiments, a plurality of measuring units 31 are provided, and the plurality of measuring units 31 are arranged in an array along the second direction of the mounting portion 30 , and the measuring units 31 include one or more laser sensors, and the one or more laser sensors are used to measure the distance information from the detection light beam to multiple positions of the forming area 21 .

[0055] Specifically, the measuring unit 31 can be any form of detection sensor as long as it can detect the distance information of the forming area 21. In this application, reference is made to existing laser sensors and the working principles of existing laser sensors are adopted; and the number of the laser sensors is selected by the operator according to actual needs, with the detection range of the laser sensor at least partially covering the forming area 21 as a setting requirement.

[0056] In actual implementation, before and / or after the powder spreading device moves, the laser sensor emits a series of detection beams to the forming area 21. These detection beams will scan different positions of the forming area 21 in sequence. When the laser beam reaches the powder surface of the forming area 21, part of the laser will be reflected by the surface. The receiving unit on the laser sensor will capture the reflected laser. The laser sensor calculates the distance information of each detection point by accurately measuring the flight time or reflection angle change of the reflected beam. The laser sensor generates a set of distance data points. After these distance data points are received by the central control system of the additive manufacturing equipment, they constitute the total distance data of the entire forming area 21 to accurately reflect the surface flatness of the forming area 21. Therefore, the existing principle of the laser sensor is as follows:

[0057] The laser sensor measures distance by emitting a laser beam toward the target area and receiving the laser reflected from the target surface. Specifically, the detection beam generated by the laser sensor is irradiated on the surface of the forming area 21. The time it takes for the laser beam reflected from surfaces at different distances to reach the sensor will be different. Through existing principles such as "Time of Flight" (ToF), triangulation or phase shift method, the laser sensor can accurately calculate the distance between the detection beam and the surface. The transmitting and receiving modules of the laser sensor are connected to the central control system of the additive manufacturing equipment. The receiving module of the laser sensor will collect the reflected laser data in real time, and then the signal processing module integrated in the laser sensor or the central control system of the additive manufacturing equipment will convert the collected analog signal into distance data.

[0058] Specifically, the hardware connection and processing process between the laser sensor of the present application and the central control system of the additive manufacturing equipment can be implemented by the operator using any existing technology as long as the detection of the forming area 21 can be completed. The embodiment of the present application is briefly described, and the operator can perform adaptive settings or adjustments specifically:

[0059] Laser sensors are usually connected to the central control system through an interface circuit to achieve signal transmission and electrical control. Typical hardware interfaces include: a power supply interface, which provides a stable power supply for the laser sensor. Common voltages are 5V, 12V, or 24V. The power supply line passes through a filter and voltage regulator module to reduce the impact of voltage fluctuations on the laser sensor. A data interface is used to transmit the distance information measured by the laser sensor to the central control system. Common data interfaces include RS-485, RS-232, Ethernet, and CAN bus. These interfaces provide high anti-interference capabilities and support long-distance stable transmission. A control signal interface is used for the central control system to turn on, off, and set parameters for the laser sensor. It usually uses a digital I / O interface or a serial communication protocol (such as MODBUS, EtherCAT, etc.).

[0060] Before being transmitted to the central control system, the laser sensor's distance measurement data undergoes preprocessing within the sensor. The detailed process is as follows: Internal signal conversion: The laser sensor converts the optical signal into an electrical signal. After the laser beam reflects off the measurement area and returns to the sensor's receiver, the resulting electrical signal is converted to a digital signal via an internal analog-to-digital converter (ADC) for subsequent data processing. Preliminary data processing: The microcontroller (MCU) within the laser sensor performs preliminary filtering and correction on the measurement data to remove noise and jitter. The processed data is then transmitted to the central control system via an interface circuit for further analysis and use.

[0061] To achieve real-time data transmission, real-time industrial communication protocols are usually used between laser sensors and central control systems. These protocols ensure stable data transmission in complex electromagnetic environments. Common communication protocols include: CAN bus, which is suitable for multi-sensor environments and can achieve synchronous data transmission of multiple laser sensors through ID identifiers, ensuring that sensor data is processed synchronously in the central control system. EtherCAT provides a high-real-time Ethernet protocol that supports synchronous control and data acquisition of multiple sensors and can efficiently transmit large amounts of data to the central control system. MODBUS / RS-485 is more commonly used in low-speed environments. It achieves unidirectional or bidirectional data transmission of sensors through serial bus connections and supports serial connections of multiple sensors.

[0062] After the data is transmitted to the central control system, the system further processes the measurement data to achieve real-time detection and feedback control. The specific implementation process is as follows: The control system's built-in data acquisition module reads the measurement data transmitted by the laser sensor. If using the CAN bus or EtherCAT, the bus controller simultaneously obtains data from multiple laser sensors and synchronizes them using timestamp information. The data acquisition module decodes the signals from the sensors and converts the transmitted distance data into a data format that meets the system standard (such as floating-point format). To eliminate errors caused by powder surface roughness or other interfering factors, the system performs low-pass filtering or median filtering on the data to obtain a smooth distance measurement curve. Based on the distance information provided by multiple laser sensors, the central control system calculates the powder layer thickness and uniformity in the forming area 21. By interpolating and fitting the multi-point distance measurement data, it generates a three-dimensional surface image of the powder bed, ensuring uniform thickness information at each location. The central control system typically stores the laser sensor data in internal memory to facilitate subsequent data analysis and traceability. During the quality control process, this data can also be saved as a test log for subsequent tracking of product quality.

[0063] Through the existing basic principles of the above laser sensors, the connection and data processing process between the laser sensor and the central control system of the additive manufacturing equipment can be realized. Figure 5 and Figure 6 As shown, Figure 5 It shows a schematic diagram of the first direction installation of the measuring unit of the present application, Figure 6 A schematic diagram of the second orientation installation of the measuring unit of the present application is shown. In some embodiments, the mounting portion 30 of the present application is provided with a plurality of stepped mounting slots 300, which are arranged along the X-axis of the mounting portion 30, and the plurality of stepped mounting slots 300 are arranged in a non-overlapping or partially overlapping manner along the X-axis of the mounting portion 30, and one or more measuring units 31 are mounted in the stepped mounting slots 300.

[0064] Specifically, the mounting groove 300 in the mounting portion 30 has a layered structure, and each stepped groove has a certain height difference relative to the upper or lower layer, so that the measuring unit 31 can measure the forming area 21 at different heights, ensuring multi-directional coverage of the detection range; one or more laser sensors are installed in the stepped mounting groove 300, and the installation position of the laser sensor is set according to the height of the groove, and after the laser sensor is installed, the laser sensor is fixed to avoid looseness and deviation.

[0065] After the stepped mounting grooves 300 are arranged in a partially overlapping manner along the X-axis direction of the mounting portion 30, due to the partial overlap of the stepped mounting grooves 300, the detection areas between the laser sensors after normal installation also partially overlap, thereby obtaining richer detection data, cross-verifying boundary areas and complex shape areas, and improving the overall detection accuracy.

[0066] After the stepped mounting grooves 300 are arranged in a non-overlapping manner along the X-axis direction of the mounting portion 30 , the detection areas of the laser sensors need to be adjusted so that the detection areas of the laser sensors are sequentially adjusted to partially overlap.

[0067] Through the stepped arrangement, the mounting portion 30 realizes partitioned coverage of the sensor detection range. Each laser sensor can cover different areas of the forming area 21, so that the powder bed thickness and uniformity of the entire forming area 21 can be fully detected, avoiding blind spots or detection errors caused by a single perspective; and the stepped mounting slot 300 can be compatible with different models of measuring units 31 to meet different detection accuracy requirements. Through flexible slot height, the configuration of the measuring unit 31 can be flexibly adjusted according to the complexity of the forming area 21 and the properties of the powder material.

[0068] Exemplary, reference Figure 6 As shown, several measuring units are set on the same side of the movement direction of the powder laying head, which are respectively referred to as measuring unit 31a, measuring unit 31b, measuring unit 31c and measuring unit 31d. Measuring unit 31a is close to the powder laying head, measuring unit 31b is located on the side of measuring unit 31a away from the powder laying head, measuring unit 31c is located on the side of measuring unit 31b away from measuring unit 31a, and measuring unit 31d is located on the side of measuring unit 31c away from measuring unit 31b, and so on. The forming area is covered by the detection range of measuring unit 31a, measuring unit 31b, measuring unit 31c and measuring unit 31d.

[0069] Therefore, according to the above content, in some embodiments, a plurality of measuring units 31 are arranged on the mounting portion 30 in a partially overlapping manner along the first direction and / or the second direction, and the detection ranges of the plurality of measuring units 31 are set to partially overlap.

[0070] Specifically, if it is necessary to detect the forming area 21 before the powder laying head 10 moves, the mounting part 30 is installed on the same side of the movement direction of the powder laying head 10, and several laser sensors are installed in the mounting part 30; if it is necessary to detect the forming area 21 after the powder laying head 10 moves, the mounting part 30 is installed on the opposite side of the movement direction of the powder laying head 10, and several laser sensors are installed in the mounting part 30; if it is necessary to detect the forming area 21 before and after the movement of the powder laying head 10, the mounting part 30 is installed on the same side and opposite side of the movement direction of the powder laying head 10, and several laser sensors are installed in the mounting part 30.

[0071] refer to Figure 7 and Figure 8 As shown, Figure 7 A schematic diagram of the first direction angle adjustment setting of the measurement unit of the present application is shown. Figure 8 A schematic diagram of the first direction angle adjustment installation of the measuring unit of the present application is shown; in some embodiments, several measuring units 31 are arranged on the installation portion 30 along the first direction at intervals set by the operator, and several measuring units 31 are set to different installation angles, so that the detection ranges of the several measuring units 31 partially overlap.

[0072] refer to Figure 9 and Figure 10 As shown, Figure 9 A schematic diagram of the second direction angle adjustment setting of the measurement unit of the present application is shown. Figure 9 A schematic diagram of the second direction angle adjustment installation of the measuring unit of the present application is shown; in some embodiments, several measuring units 31 are arranged on the installation portion 30 along the first direction at intervals set by the operator, and several measuring units 31 are set to different installation angles, so that the detection ranges between the several measuring units 31 partially overlap.

[0073] Figure 11 and Figure 12 As shown, Figure 11 shows a schematic diagram of the first double-sided angle adjustment setting of the measurement unit of the present application, Figure 12 A schematic diagram of the second bilateral angle adjustment setting of the measuring unit of the present application is shown; in some embodiments, a plurality of measuring units 31 are arranged on the mounting portion 30 along the first direction and the second direction at intervals set by the operator, and the plurality of measuring units 31 are set to different mounting angles, so that the detection ranges between the plurality of measuring units 31 partially overlap.

[0074] Specifically, the mounting portion 30 is installed on the same side and / or opposite side of the movement direction of the powder laying head 10 according to the actual needs of detection, and then several laser sensors are installed in the mounting portion 30, and the angles of the laser sensors are adjusted. Since the laser sensor has a certain angle adjustment relative to the upper or lower layer, it can measure the forming area 21 at different angles, ensuring multi-angle coverage of the detection range.

[0075] refer to Figure 13 and Figure 14 As shown, Figure 13 The diagram shows the first direction angle adjustment installation diagram of the Z-axis direction of the measuring unit of the present application. Figure 14 A schematic diagram of the second direction angle adjustment installation of the Z-axis direction of the measuring unit of the present application is shown; in some embodiments, the mounting portion 30 is provided with a plurality of mounting slots 300 with different angles, and the plurality of mounting slots 300 with different angles are arranged along the Z-axis direction of the mounting portion 30, and the plurality of mounting slots 300 with different angles are arranged in a non-overlapping or partially overlapping manner along the Z-axis direction of the mounting portion 30, and one or more measuring units 31 are respectively installed in the mounting slots 300.

[0076] Specifically, the mounting portion 30 is provided with a plurality of mounting grooves 300 arranged along the Z-axis direction. Each mounting groove 300 is arranged according to a preset angle, and some mounting grooves 300 are arranged in a non-overlapping or partially overlapping manner. Each laser sensor is installed in a mounting groove 300 at a different angle, so that the laser sensor can cover the forming area 21 at different detection angles after installation, and avoid mutual interference between the light beams of the laser sensors, thereby ensuring the overlapping coverage of the detection area; after the laser sensor is installed, the laser sensor is fixed to avoid looseness and deviation.

[0077] After the mounting grooves 300 are arranged in a partially overlapping manner along the Z-axis direction of the mounting portion 30, due to the partial overlap of the mounting grooves 300, the detection areas between the laser sensors after normal installation also partially overlap, thereby obtaining richer detection data, cross-verifying boundary areas and complex shape areas, and improving the overall detection accuracy.

[0078] After the mounting grooves 300 are arranged in a non-overlapping manner along the Z-axis direction of the mounting portion 30 , it is necessary to adjust the angles of the laser sensors so as to adjust the detection areas of the laser sensors to partially overlap in sequence.

[0079] The arrangement of the mounting slots 300 at different angles enables the laser sensor to detect the forming area 21 from multiple angles, covering the reflected light beams at multiple angles on the surface of the forming area 21, making the detection data more comprehensive and detailed, and is especially suitable for forming areas 21 with complex shapes and details.

[0080] Thus according to the above, in some embodiments, reference Figure 14 As shown, if it is necessary to detect the forming area 21 before the powder spreading head 10 moves, the mounting portion 30 is installed on the same side of the movement direction of the powder spreading head 10, and several laser sensors are installed in the mounting portion 30 along the Z-axis direction; Figure 13 As shown, if it is necessary to detect the forming area 21 after the powder spreading head 10 moves, the mounting portion 30 is installed on the opposite side of the movement direction of the powder spreading head 10, and several laser sensors are installed in the mounting portion 30 along the Z-axis direction; Figure 15 As shown, Figure 15 A schematic diagram of the double-sided angle adjustment setting of the measuring unit of the present application is shown. If it is necessary to detect the forming area 21 before and after the movement of the powder laying head 10, the mounting part 30 is installed on the same side and the opposite side of the movement direction of the powder laying head 10, and at the same time, several laser sensors are installed in the mounting part 30 along the Z-axis direction.

[0081] In some embodiments, a single measuring unit 31 is provided. The single measuring unit 31 is provided on the mounting portion 30 , and the measuring unit 31 includes a laser sensor for measuring distance information from the detection light beam to the position of the forming area 21 .

[0082] Specifically, the laser sensor is arranged on the mounting portion 30 through a linear driver 32, and the linear driver 32 is used to drive the laser sensor to move along the Y-axis direction. As long as the linear driver 32 can drive the laser sensor to move linearly back and forth, it can be any form of linear drive structure, including but not limited to hydraulic structure, pneumatic structure, electric (reciprocating motion is provided by driving screw, cam, etc.) structure, etc. to provide reciprocating linear motion power structure, and in this application, reference is made to the existing electric push rod. In the actual implementation process, when the forming area 21 is detected, the laser sensor reciprocates along the Y-axis direction to scan the distance information from the detection light beam to the forming area 21 within the detection range, and the laser sensor follows the powder spreading head 10 of the additive manufacturing equipment to scan the distance information from the detection light beam to the forming area 21 before and / or after the powder spreading in the forming area 21.

[0083] refer to Figure 16As shown, for example, the forming area 21 is divided into a detection area A21a, a detection area B21b and a detection area C21c, the detection area A21a is divided into a detection point a21I and a detection point b21II, the detection area B21b is divided into a detection point c21III and a detection point d21IV, and the detection area C21c is divided into a detection point e21V and a detection point f21VI. When the powder laying head 10 moves to the detection area A21a, the laser sensor scans the detection point a21I of the detection area A21a and moves to the detection point b21II area through the linear drive 32 to scan the detection point b21II; when the powder laying head 10 moves Before moving to the detection area B21b, the laser sensor scans the detection point c21IV of the detection area B21b and moves to the detection point d21III area through the linear driver 32, scanning the detection point d21III; when the powder laying head 10 moves to the detection area C21c, the laser sensor scans the detection point e21V of the detection area C21c and moves to the detection point f21VI area through the linear driver 32, scanning the detection point f21VI, and so on, and the movement speed of the linear driver 32 is greater than the movement speed of the powder laying head 10, to ensure that when moving to the detection area, the detection points of the detection area can be covered and scanned.

[0084] In some embodiments, the present application also relates to an additive manufacturing device equipped with the above-mentioned powder bed coating quality detection device.

[0085] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0086] Description of reference numerals:

[0087] 10. Spread the powder head

[0088] 20 Forming platform

[0089] 21 Forming area

[0090] 30 Installation

[0091] 31 measurement units

[0092] 32 linear drives

[0093] 31a Measurement Unit I

[0094] 31b Measurement Unit II

[0095] 31c Measurement Unit III

[0096] 31d Measurement Unit IV

[0097] 31e Measurement unit set in the first direction

[0098] 31f Measurement unit set in the second direction

[0099] 21a Detection area A

[0100] 21b Detection area B

[0101] 21c Detection Area C

[0102] 21I detection point a

[0103] 21II Checkpoint b

[0104] 21III Checkpoint c

[0105] 21IV detection point d

[0106] 21V detection point e

[0107] 21VI detection point f

[0108] 300 mounting slot

Claims

1. A powder bed coating quality detection device, characterized in that: include: a mounting portion (30) mounted in the additive manufacturing device; One or more measuring units (31) are arranged along a preset direction of the mounting portion (30), and are used to emit a generated detection beam to a three-dimensional object forming area (21) before and / or after the powder spreading device moves, and to capture the detection beam reflected by the surface of the forming area (21), thereby obtaining distance information mapped by the forming area (21); The detection range formed by the one or more measuring units (31) at least partially covers the forming area (21).

2. The detection device according to claim 1, characterized in that The mounting portion (30) is horizontally or obliquely arranged on a powder spreading device of an additive manufacturing device and is located on at least one side of a movement direction of the powder spreading device.

3. The detection device according to claim 2, characterized in that The measuring unit (31) includes one or more laser sensors, and the one or more laser sensors are used to measure distance information from a detection light beam to multiple positions of the forming area (21).

4. The detection device according to claim 3, characterized in that A single measuring unit (31) includes a laser sensor, which is arranged on a mounting portion (30) via a linear drive. The laser sensor moves in a first direction following the powder spreading device and moves in a second direction via the linear drive, and is used to sequentially measure distance information from a detection light beam to multiple positions of the forming area (21).

5. The detection device according to claim 3, characterized in that The mounting portion (30) is provided with a plurality of stepped mounting grooves (300), and the plurality of stepped mounting grooves (300) are arranged along a preset direction of the mounting portion (30).

6. The detection device according to claim 5, characterized in that The plurality of stepped mounting grooves (300) are arranged in a partially overlapping manner along a preset direction of the mounting portion (30).

7. The detection device according to claim 1 or 6, characterized in that: A plurality of measuring units (31) are arranged on the mounting portion (30) in a partially overlapping manner along a first direction, and detection ranges between the plurality of measuring units (31) are set to partially overlap.

8. The detection device according to claim 1 or 6, characterized in that: A plurality of measuring units (31) are arranged on the mounting portion (30) in a partially overlapping manner along the second direction, and the detection ranges of the plurality of measuring units (31) are set to partially overlap.

9. The detection device according to claim 1 or 6, characterized in that: A plurality of measuring units (31) are arranged on the mounting portion (30) along a first direction and / or a second direction at preset intervals, and the plurality of measuring units (31) are arranged at different mounting angles so that the detection ranges of the plurality of measuring units (31) partially overlap.

10. The detection device according to claim 3, characterized in that: The mounting portion (30) is provided with a plurality of mounting grooves (300) with different angles, and the plurality of mounting grooves (300) are arranged along a second preset direction of the mounting portion (30).

11. The detection device according to claim 1 or 10, characterized in that: A plurality of measuring units (31) are arranged on the mounting portion (30) along a second preset direction and at different angles, and the detection ranges of the plurality of measuring units (31) are set to partially overlap.

12. The detection device according to claim 1 or 10, characterized in that: A plurality of measuring units (31) are arranged on the mounting portion (30) along a second preset direction and at different angles, and the plurality of measuring units (31) are arranged to partially overlap, so that the detection ranges of the plurality of measuring units (31) partially overlap.

13. An additive manufacturing device comprising the detection device according to any one of claims 1 to 12.

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