Laser printing method, device and equipment based on annular light spot laser and medium

Abstract

The invention discloses a laser printing method, device and equipment based on an annular light spot laser and a medium, and the method comprises the steps that in response to a printing starting instruction, a control module obtains printing parameters of a to-be-printed part; the control module controls the printing module to perform powder laying treatment based on the printing parameters to obtain a powder laying contour; the monitoring module sends a first printing signal to the control module after detecting that the printing module completes powder laying treatment; the control module controls the annular light spot laser to conduct laser printing on the powder laying contour based on the first printing signal and the printing parameters to obtain a first printing part. According to the embodiment of the invention, the control module controls the printing module to perform powder laying treatment by using the printing parameters to obtain the powder laying contour, and the first printing signal sent by the monitoring module is combined with the printing parameters to control the annular light spot laser to perform laser printing on the powder laying contour to obtain the first printing part, so that the printing efficiency is improved. And the stability of the construction process is improved, so that the printing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of laser printing technology, and in particular to a laser printing method, device, equipment and medium based on an annular spot laser. Background Art

[0002] Laser powder bed fusion has become the preferred process for additive manufacturing of complex and fine-structured metal parts, and is widely used in a variety of commercial fields including aerospace, medical, automotive and machinery. Although additive manufacturing has greatly improved the design freedom for industrial manufacturing, the cost of manufacturing parts through laser powder bed fusion technology is still considered too high. The main reason is that the point laser line scanning method has the pain point of low efficiency.

[0003] In order to print very fine structures such as lattices or thin walls, laser powder bed fusion 3D printing equipment uses a single-mode laser with a Gaussian intensity distribution, but when printing large solid sections, the beam diameter is small, resulting in a low regional scanning speed. The line scanning speed is closely related to the laser power. Increasing the laser power can increase the scanning speed, but the peak intensity of the Gaussian distribution of a higher-power laser will lead to excessive center temperature, overheating of the molten pool, increased volatilization of the powder material components, and excessive spatter and soot, which will lead to an unstable construction process, defects such as inclusions, pores, and unfused parts, affecting the quality of the formed parts. Therefore, the current laser printing technology has the problem of low printing efficiency. Summary of the invention

[0004] The embodiments of the present invention provide a laser printing method, device, equipment and medium based on an annular spot laser, aiming to solve the problem in the prior art that the laser printing technology based on annular spot laser has an unstable construction process, produces defects such as inclusions, pores, and unfused parts, affects the quality of the formed parts, and thus leads to low printing efficiency.

[0005] In order to solve the above problems, in the first aspect, an embodiment of the present invention provides a laser printing method based on an annular spot laser, which is applied to a control module of a laser printing system, wherein the control module is communicatively connected with a monitoring module and a printing module in the laser printing system; the printing module includes an annular spot laser; and the laser printing method based on annular spot laser includes:

[0006] In response to the start printing instruction, the control module obtains printing parameters of the part to be printed;

[0007] The control module controls the printing module to perform powder spreading processing based on the printing parameters to obtain a powder spreading contour;

[0008] After the monitoring module detects that the printing module has completed the powder spreading process, the monitoring module sends a first printing signal to the control module;

[0009] The control module controls the annular spot laser to perform laser printing on the powder spreading contour to obtain a first printed part based on the first printing signal and the printing parameters.

[0010] In a second aspect, an embodiment of the present application provides a laser printing device based on an annular spot laser, which is applied to a control module of a laser printing system, wherein the control module is communicatively connected with a monitoring module and a printing module in the laser printing system; the printing module includes an annular spot laser; the laser printing device based on annular spot laser includes:

[0011] An acquisition unit, in response to a start printing instruction, controls the module to acquire printing parameters of the part to be printed;

[0012] A powder spreading unit, wherein the control module controls the printing module to perform powder spreading processing based on the printing parameters to obtain a powder spreading contour;

[0013] A detection unit, wherein after the monitoring module detects that the printing module has completed the powder spreading process, the monitoring module sends a first printing signal to the control module;

[0014] The printing unit, the control module controls the annular spot laser to perform laser printing on the powder spreading contour to obtain a first printed part based on the first printing signal and the printing parameters.

[0015] In a third aspect, an embodiment of the present application provides a computer device, comprising a memory and a processor connected to the memory; the memory is used to store a computer program, and the processor is used to run the computer program stored in the memory to execute the method described in the first aspect above.

[0016] In a fourth aspect, an embodiment of the present application provides a storage medium, wherein the storage medium stores a computer program, wherein the computer program includes program instructions, and when the program instructions are executed by a processor, the method described in the first aspect above is implemented.

[0017] The embodiment of the present invention provides a laser printing method, device, equipment and medium based on an annular spot laser, which is applied to a control module of a laser printing system, wherein the control module is in communication connection with a monitoring module and a printing module in the laser printing system; the printing module includes an annular spot laser; the laser printing method based on annular spot laser includes: in response to a start printing instruction, the control module obtains printing parameters of a part to be printed; the control module controls the printing module to perform powder spreading processing based on the printing parameters to obtain a powder spreading contour; after the monitoring module detects that the printing module has completed the powder spreading processing, it sends a first printing signal to the control module; the control module controls the annular spot laser to perform laser printing on the powder spreading contour to obtain a first printed part based on the first printing signal and the printing parameters. It can be seen that by implementing the embodiment of the present invention, the control module controls the printing module to perform powder spreading processing using the acquired printing parameters to obtain a powder spreading contour, and uses the first printing signal sent by the monitoring module in combination with the printing parameters to control the annular spot laser to perform laser printing on the powder spreading contour to obtain the first printed part, thereby improving the stability of the construction process and thus improving the printing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0019] Figure 1 A schematic flow chart of a laser printing method based on an annular spot laser provided in an embodiment of the present invention;

[0020] Figure 2 A schematic block diagram of a laser printing device based on an annular spot laser provided in an embodiment of the present invention;

[0021] Figure 3 A schematic block diagram of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0024] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0025] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0026] See also Figure 1 , Figure 1 The following is a flow chart of a laser printing method based on an annular spot laser provided in an embodiment of the present invention. Figure 1 As shown, an embodiment of the present invention provides a laser printing method based on an annular spot laser, which is applied to a control module of a laser printing system, wherein the control module is communicatively connected with a monitoring module and a printing module in the laser printing system; the printing module includes an annular spot laser.

[0027] The laser printing method based on annular spot laser includes the following steps S110-S140.

[0028] S110, in response to the start printing instruction, the control module obtains printing parameters of the part to be printed.

[0029] In this embodiment, the start printing instruction can be sent to the control module by a start printing button, or an instruction generated by the monitoring module when it detects that a print file is sent to the laser printing system and sent to the control module; specifically, it can be set according to the actual situation of the laser printing system.

[0030] The laser printing system includes a control module, a monitoring module and a printing module, and the control module is in communication connection with the monitoring module and the printing module; the printing module includes an annular spot laser, and the control module is also in communication connection with the annular spot laser. The printing module may also include a scraper, a material bin, a forming bin, a collimator expander, a scanner, an isolation glass and a single-mode enhanced laser, and the control module may directly control the operation of the scraper, the material bin, the forming bin, the collimator expander, the scanner and the single-mode enhanced laser.

[0031] In one embodiment, the control module obtains the printing parameters of the part to be printed, including:

[0032] Analyze the part size, part outline and part material based on the printing file;

[0033] Determining the number of powder spreading layers based on the part size and a preset powder spreading thickness;

[0034] The printing parameters are composed based on the powder thickness, the number of powder layers, the part contour and the part material.

[0035] In this embodiment, the print file is a file sent to the control module in the laser printing system for printing the part to be printed; the type of the print file may be DOC, DOCX, PDF or WPS; the part size is the size parameter of the part to be printed, which may include diameter, width, height, depth, thickness and center distance, etc., and may also include nominal size and limit size, etc.; the part contour refers to the part shape of the part to be printed within a certain length corresponding to the preset powder laying thickness; the part material refers to the material used for printing the part to be printed, such as metal material, etc.; the preset powder laying thickness refers to the thickness of the material powder during each powder laying process, which can be pre-set according to actual conditions; at the same time, one powder laying process corresponds to one powder laying thickness, that is, the powder laying thickness of each powder laying process may be different.

[0036] Specifically, the control module performs text analysis and image analysis according to the printing file to obtain the part size, the part outline and the part material; wherein the text analysis and image analysis can be operated and processed by a preset analysis strategy; the control module performs calculation according to the part size and the powder thickness to obtain the number of powder layers; wherein the calculation can be a division calculation, and when there is a remainder, the remainder can be used as the powder thickness of the last layer. In this way, the powder thickness, the number of powder layers, the part outline and the part material constitute the printing parameters.

[0037] Through the above embodiments, it can be known that the part size, part contour and part material can be obtained by analyzing the printing file; the number of powder layers can be determined using the part size and the preset powder thickness; in this way, the powder thickness, the number of powder layers, the part contour and the part material constitute the printing parameters, so that the printing parameters can be used for subsequent targeted processing, thereby improving the printing accuracy and printing efficiency.

[0038] S120, the control module controls the printing module to perform powder spreading processing based on the printing parameters to obtain a powder spreading contour.

[0039] In this embodiment, the printing module, under the control of the control module, performs powder spreading processing according to the printing parameters to obtain the powder spreading contour, that is, the printing module uses the powder spreading thickness, the number of powder spreading layers, the part contour and the part material to perform powder spreading processing to obtain the powder spreading contour.

[0040] In one embodiment, the printing module further includes a scraper, a silo and a forming silo; the control module controls the printing module to perform powder spreading processing based on the printing parameters to obtain a powder spreading profile, including:

[0041] Obtaining corresponding material powder from the silo based on the part material;

[0042] Determine a plurality of part sub-contours using the part contour and the number of powder layers;

[0043] Obtain a part sub-contour as the current part sub-contour based on a preset sequence to determine the powder spreading size;

[0044] Controlling the scraper to start, the scraper sets the size of the material powder to the powder spreading size and sets the thickness of the material powder to the corresponding powder spreading thickness on the working surface of the forming bin, so as to determine the powder spreading sub-contour corresponding to the current part sub-contour;

[0045] Control the scraper to retract.

[0046] In this embodiment, the scraper can be arranged on one side or above the forming bin; the material bin is arranged above the forming bin, and can be lifted and lowered when obtaining the corresponding material powder; the forming bin is a plane, which may include a working surface (or powder bed) and a forming cylinder; wherein the working surface is a part of the forming bin; the forming cylinder is arranged within the range of the working surface, and can be lifted and lowered, which is equivalent to a lifting platform.

[0047] The silo stores powders formed after various part materials are crushed; the material powder refers to the powder corresponding to the part material obtained from the silo.

[0048] Specifically, the control module obtains the corresponding material powder from the silo according to the part material, and uses the part contour and the number of powder layers to determine multiple part sub-contours, that is, each number of powder layers corresponds to a part sub-contour; at the same time, the control module obtains a part sub-contour as the current part sub-contour based on the preset order to determine the powder spreading size, including: obtaining a part sub-contour from multiple part sub-contours as the current part sub-contour in the preset order, and obtaining the length and width of the current part sub-contour, and taking the length and the width as the powder spreading size; wherein the length refers to the highest point and the lowest point of the current part sub-contour. The distance between them; the width refers to the distance between the leftmost point to the rightmost point of the current part sub-contour; the preset order can be a bottom-to-top order; the control module controls the scraper to start, and controls the scraper to unfold; the control module controls the scraper to perform powder spreading on the forming cylinder in the working surface, gathers the material powder to spread the size of the material powder as the powder spreading size, and spreads the thickness of the material powder as the powder spreading thickness, that is, the size of the material powder is equal to the powder spreading size, and the thickness of the material powder is equal to the powder spreading thickness; in this way, the powder spreading sub-contour corresponding to the current part sub-contour is determined; the control module controls the scraper to be retracted.

[0049] Through the above embodiments, it can be known that the material powder is obtained by combining the part material with the material bin, and multiple part sub-contours are determined by using the part contour and the number of powder spreading layers. A part sub-contour obtained based on a preset sequence is used as the current part sub-contour to determine the powder spreading size; the scraper is controlled to start, and the scraper spreads the size of the material powder as the powder spreading size on the working surface of the forming bin, and spreads the thickness of the material powder as the corresponding powder spreading thickness, so as to determine the powder spreading sub-contour corresponding to the current part sub-contour. Therefore, the automatic determination of the powder spreading sub-contour corresponding to the current part sub-contour is achieved, and the printing efficiency is improved, so that the powder spreading sub-contour can be used for subsequent targeted processing.

[0050] S130: After the monitoring module detects that the printing module has completed the powder spreading process, the monitoring module sends a first printing signal to the control module.

[0051] In this embodiment, the monitoring module detects the working status of the printing module in real time, generates the first printing signal after detecting that the printing module has completed the powder spreading process, and sends the first printing signal to the control module.

[0052] S140. The control module controls the annular spot laser to perform laser printing on the powder spreading contour based on the first printing signal and the printing parameters to obtain a first printed part.

[0053] In one embodiment, the printing module further includes a scanner; the control module controls the annular spot laser to perform laser printing on the powder spreading contour to obtain a first printed part based on the first printing signal and the printing parameters, including:

[0054] In response to the first printing signal, controlling the scanner to determine a printing path based on the current part sub-contour;

[0055] Based on the printing path, the first beam power and the second beam power of the annular spot laser are correspondingly allocated, and the annular spot laser is turned on to emit the first beam and the second beam, the first beam is at the first beam power and the second beam is at the second beam power, so as to perform laser melting processing on the material powder within the range of the printing path in the powder laying contour to obtain the first printed part;

[0056] Turn off the annular spot laser.

[0057] In this embodiment, the annular spot laser can emit two light beams, namely the first light beam and the second light beam; the first light beam is emitted according to the first beam power, and the second light beam is emitted according to the second beam power; and the first beam power and the second beam power can be equal or unequal, that is, the first beam power can be equal to or unequal to the second beam power. It should be noted that the power of the first beam can be equal to 0 watts (W) or the power of the second beam can be equal to 0 watts (W); in this way, the two beams that can be emitted by the annular spot laser have three situations; the first situation is that the power of the first beam is equal to 0 watts (W) and the power of the second beam is greater than 0 watts (W), that is, the first beam is not emitted, and only the second beam emits a point-shaped beam according to the power of the second beam; the second situation is that the power of the first beam is greater than 0 watts (W) and the power of the second beam is equal to 0 watts (W), that is, the second beam is not emitted, and only the first beam emits an annular beam according to the power of the first beam; the third situation is that the power of the first beam is greater than 0 watts (W) and the power of the second beam is greater than 0 watts (W), that is, the first beam emits an annular beam according to the first beam power, and the second beam emits a point-shaped beam according to the second beam power. At this time, the annular beam combined with the point-shaped beam can form a saddle-shaped beam, that is, the first beam is an annular beam, the second beam is a point-shaped beam, and the first beam surrounds the second beam. Therefore, the first beam power and the second beam power can be intelligently allocated in real time according to the printing path at different positions to perform laser melting processing more quickly. Moreover, laser light sources play a key role in the development of additive manufacturing. Usually, the output power of the laser can be adjusted in time with high frequency, but its spatial intensity distribution is fixed. In order to improve productivity, the beam profile must be adjusted immediately to match the required structural size; while laser printing combined with annular spot laser uses annular spot laser to quickly switch the size (i.e., beam power) and shape (i.e., point shape, ring shape, saddle shape) of the output beam, so that the beam profile can be adjusted between single mode (i.e., point shape) and ring shape to obtain various shapes between the two. When interacting with the material powder, the soot and splash generated are significantly reduced. In contrast, annular beams and saddle beams (i.e., annular beams with a certain intensity in the center) can produce uniform lateral temperature distribution and wide and flat track cross-sections in the material powder during laser melting processing, and soot and splash are also greatly reduced, so that higher laser power, faster scanning speed, and larger process window can be used to effectively improve the printing speed.

[0058] The two types of beams that can be emitted by the annular spot laser change the Gaussian intensity distribution characteristics of the laser, increase the spot diameter, and make the energy distribution more uniform, which can effectively reduce spatter and defects, thereby improving printing efficiency; at the same time, in order to maintain the accuracy of the lattice, thin wall and contour, a small beam diameter laser is still required. Therefore, a laser powder bed beam shaping printing technology solution combined with an annular spot laser is proposed. Moreover, laser light sources play a key role in the development of additive manufacturing. Usually, the output power of the laser can be adjusted in time with high frequency, but its spatial intensity distribution is fixed. In order to improve productivity, the beam profile must be adjusted in real time to match the required structural size. The technical solution for laser printing combined with the annular spot laser is to use the annular spot laser to quickly switch the size and shape of the output beam, so that the beam profile can be adjusted between single mode and annular, and various shapes between the two can be obtained. When interacting with the material powder, the soot and spatter generated are significantly reduced, which improves the stability of the construction process and thus improves the printing efficiency.

[0059] Specifically, after receiving the first printing signal, the control module controls the galvanometer in the scanner to scan the printing path according to the current sub-contour; at the same time, the control module automatically allocates the first beam power and the second beam power of the annular spot laser based on the printing path, that is, for different positions in the printing path, the magnitude of the first beam power may be different, and the magnitude of the second beam power may also be the same, which can be specifically set according to the position of the printing path; the annular spot laser is turned on to emit the first beam and the second beam, and the first beam is according to the first beam power and the second beam is according to the second beam power through the transmission collimator and beam expander in the collimator expander and the galvanometer and field lens in the scanner to perform laser melting processing on the material powder within the range of the printing path in the powder-laying sub-contour to obtain the first printed part; the control module turns off the annular spot laser. It should be noted that the point laser (i.e., the second beam) at the center of the formed annular beam can maintain high-precision printing of the contour and the inner flow channel. When scanning the outer edge contour of the material powder within the range of the printing path in the powder-laying contour, only the center point laser (i.e., the second beam) is retained to reduce the spot diameter and the point spot power, and the single-mode Gaussian beam (i.e., the second beam) in the center is used to achieve high-precision printing and fine features of the inner and outer surface contours. In addition, the annular beam (i.e., the first beam) generated by the annular spot laser can realize local regulation of microstructure and material properties, and specifically regulate the organizational characteristics of the key parts of the parts to be printed, and improve the mechanical properties of the key structural parts; since the shape of the point ring beam (i.e., the first beam and the second beam) can be changed in real time, by configuring the working mode of the internal and external laser spots, the thermal gradient and solidification dynamics in the molten pool (i.e., the material powder that needs to be melted or has been melted within the range of the printing path in the powder-laying contour) are controlled, and the microstructure of the material is further designed and adjusted, thereby giving new functions and optimized characteristics to the entire part, and improving the ultimate tensile strength or ultimate strain of the key parts of the part. Therefore, during the printing process, the annular spot profiles formed by the first and second beams can be adjusted instantly to change the geometry and temperature regulation of the melting track, and by selecting a specific beam profile to strategically control grain growth, the properties of the formed component can be fine-tuned to make specific parts of the component particularly hard or flexible without any subsequent processing work.

[0060] Through the above embodiments, it can be known that after receiving the first printing instruction, the control module controls the scanner in the printing module to scan the printing path according to the current part sub-contour, and automatically allocates the first beam power and the second beam power of the annular spot laser based on the printing path, and the first beam is laser-melted according to the first beam power and the second beam is laser-melted according to the second beam power through the collimator expander and the scanner to obtain the formed first printed part. Therefore, the first beam power and the second beam power are automatically allocated according to the determined printing path, so that the material powder within the range of the printing path in the powder sub-contour is laser-melted according to the first beam power and the second beam power to obtain the formed first printed part, which improves the stability of the construction process, thereby improving the printing efficiency, so as to use the first printed part for subsequent targeted processing.

[0061] In one embodiment, after the control module controls the annular spot laser to perform laser printing on the powder spreading contour based on the first printing signal and the printing parameters to obtain a first printed part, the method further includes:

[0062] The monitoring module detects that the annular spot laser turns off the first light beam and the second light beam, and sends a second printing signal to the control module.

[0063] In this embodiment, the monitoring module detects the working status of the annular spot laser in real time; when the control module controls the annular spot laser to turn off, that is, the annular spot laser turns off the first light beam and the second light beam; at this time, the monitoring module detects that the annular spot laser turns off the first light beam and the second light beam, generates the second printing signal, and sends the second printing signal to the control module.

[0064] Through the above embodiments, it can be known that the monitoring module detects that the annular spot laser turns off the first light beam and the second light beam, and sends the second printing signal to the control module. Therefore, automatic monitoring and sending of the second printing signal are realized, and the printing efficiency and printing accuracy are improved, so that the second printing signal can be used for subsequent targeted processing.

[0065] In one embodiment, the printing module further includes a single-mode enhanced laser; after the monitoring module detects that the annular spot laser turns off the first light beam and the second light beam and sends a second printing signal to the control module, the method further includes:

[0066] The control module turns on the single-mode enhanced laser in response to the second printing signal;

[0067] The control module controls the single-mode strengthening laser to perform laser strengthening processing on the first printed part according to a preset strengthening power to obtain a target sub-part corresponding to the current part sub-contour;

[0068] The control module turns off the single-mode enhanced laser.

[0069] In this embodiment, after receiving the second printing signal, the control module controls the single-mode strengthening laser to turn on; the control module controls the single-mode strengthening laser to emit a point-shaped beam to the first printed part according to the preset strengthening power to perform laser strengthening processing to obtain the target sub-part corresponding to the sub-contour of the current part; the control module turns off the single-mode strengthening laser. The preset strengthening power can be set according to the specific actual situation.

[0070] The single-mode strengthening laser emits a point-shaped beam to the first printed part according to the strengthening power to perform laser strengthening treatment to obtain the target sub-part corresponding to the current part sub-contour. The single-mode strengthening laser emits a point-shaped beam to the first printed part according to the strengthening power to perform laser strengthening treatment on the first printed part. In this way, the extremely high peak power density of the ultrafast laser emitted by the single-mode strengthening laser can generate a strong plasma on the surface of the formed first printed part. The shock wave formed by the rapid expansion of the plasma can generate a large pressure on the surface of the first printed part, introduce residual compressive stress, and improve the surface properties of the material. That is, the single-mode strengthening laser uses the physical process of the interaction between the ultrafast laser and the material of the first printed part to generate the plasma shock wave mechanical effect for surface modification treatment. When the shock wave pressure is greater than the elastic limit of the material, permanent plastic deformation will occur, thereby improving the mechanical properties of the material surface.

[0071] In one embodiment, after shutting down the single-mode enhanced laser, the method further comprises:

[0072] After the control module turns off the single-mode enhanced laser, the method further includes:

[0073] The monitoring module detects that the single-mode enhanced laser is turned off and sends a third printing signal to the control module;

[0074] The control module lowers the forming cylinder in the working surface to a height of the powder spreading thickness based on the third printing signal;

[0075] The control module obtains the next part sub-contour as the current part sub-contour based on the preset sequence, and controls the printing module to perform powder spreading processing on the target sub-part based on the printing parameters to obtain a powder spreading sub-contour corresponding to the current part sub-contour;

[0076] After the monitoring module detects that the printing module has completed the powder spreading process, the monitoring module sends the first printing signal to the control module;

[0077] The control module controls the printing module to perform laser printing on the powder-laying sub-contour based on the first printing signal and the printing parameters to obtain a target sub-part corresponding to the current part sub-contour;

[0078] Until each part sub-contour is powdered and laser printed to obtain the target part.

[0079] In this embodiment, the monitoring module detects the working state of the single-mode enhanced laser in real time; the control module controls the single-mode enhanced laser to be turned off. At this time, the monitoring module detects that the single-mode enhanced laser is turned off, generates the third printing signal, and sends the third printing signal to the control module; after receiving the third printing signal, the control module lowers the forming cylinder in the working surface to the height of the powder thickness corresponding to the current part sub-contour; at the same time, the control module obtains the next part sub-contour among the multiple part sub-contours as the current part sub-contour based on the preset sequence, and controls the printing module to perform powder spreading processing on the basis of the target sub-part based on the printing parameters to obtain the powder spreading sub-contour corresponding to the current part sub-contour; after the monitoring module detects that the printing module completes the powder spreading processing, it sends the first printing signal to the control module; the control module controls the printing module to perform laser printing on the powder spreading sub-contour based on the first printing signal and the printing parameters to obtain the target sub-part corresponding to the current part sub-contour; the above steps are looped until each part sub-contour is subjected to powder spreading processing and laser printing to obtain the target part.

[0080] Through the above embodiments, it can be known that the control module controls the scanner to determine the printing path of the current part sub-contour based on the first printing instruction, and automatically allocates the first beam power and the second beam power of the annular spot laser based on the printing path, and the first beam is laser-melted according to the first beam power and the second beam is laser-melted according to the second beam power through the collimator expander and the scanner on the material powder within the range of the printing path in the powder-laying sub-contour to obtain the formed first printed part; and the control module controls the opening of the single-mode strengthening laser based on the first printing instruction to perform laser strengthening processing on the first printed part according to the preset strengthening power to obtain the target sub-part corresponding to the current part sub-contour; When the control module lowers the forming cylinder in the working surface to the height of the powder-spreading thickness based on the third printing signal, and the control module obtains the next part sub-contour as the current part sub-contour based on the preset order, and controls the printing module to perform powder-spreading processing on the basis of the target sub-part based on the printing parameters to obtain the powder-spreading sub-contour corresponding to the current part sub-contour; after the monitoring module detects that the printing module has completed the powder-spreading processing, it sends the first printing signal to the control module; the control module controls the printing module to perform laser printing on the powder-spreading sub-contour based on the first printing signal and the printing parameters to obtain the target sub-part corresponding to the current part sub-contour; until each part sub-contour is subjected to powder-spreading processing and laser printing to obtain the target part. The processing of automated scanning, distribution, laser melting, descending, powder-spreading, laser printing, etc. is realized to obtain the target part of the part to be printed, thereby improving the printing efficiency.

[0081] See also Figure 2 , Figure 2 Schematic block diagram of a laser printing device 100 based on an annular spot laser provided in an embodiment of the present invention. Figure 2 As shown, an embodiment of the present invention provides a laser printing device 100 based on an annular spot laser for implementing the above method, which is applied to a control module of a laser printing system, wherein the control module is communicatively connected with a monitoring module and a printing module in the laser printing system; the printing module includes an annular spot laser; the laser printing device 100 based on annular spot laser includes:

[0082] The acquisition unit 110 is used for, in response to the start printing instruction, the control module to acquire the printing parameters of the part to be printed.

[0083] In this embodiment, the start printing instruction can be sent to the control module by a start printing button, or an instruction generated by the monitoring module when it detects that a print file is sent to the laser printing system and sent to the control module; specifically, it can be set according to the actual situation of the laser printing system.

[0084] The laser printing system includes a control module, a monitoring module and a printing module, and the control module is in communication connection with the monitoring module and the printing module; the printing module includes an annular spot laser, and the control module is also in communication connection with the annular spot laser. The printing module may also include a scraper, a material bin, a forming bin, a collimator expander, a scanner, an isolation glass and a single-mode enhanced laser, and the control module may directly control the operation of the scraper, the material bin, the forming bin, the collimator expander, the scanner and the single-mode enhanced laser.

[0085] In one embodiment, the control module obtains the printing parameters of the part to be printed, including:

[0086] Analyze the part size, part outline and part material based on the printing file;

[0087] Determining the number of powder spreading layers based on the part size and a preset powder spreading thickness;

[0088] The printing parameters are composed based on the powder coating thickness, the number of powder coating layers, the part contour and the part material.

[0089] In this embodiment, the print file is a file sent to the control module in the laser printing system for printing the part to be printed; the type of the print file may be DOC, DOCX, PDF or WPS; the part size is the size parameter of the part to be printed, which may include diameter, width, height, depth, thickness and center distance, etc., and may also include nominal size and limit size, etc.; the part contour refers to the part shape of the part to be printed within a certain length corresponding to the preset powder laying thickness; the part material refers to the material used for printing the part to be printed, such as metal material, etc.; the preset powder laying thickness refers to the thickness of the material powder during each powder laying process, which can be pre-set according to actual conditions; at the same time, one powder laying process corresponds to one powder laying thickness, that is, the powder laying thickness of each powder laying process may be different.

[0090] Specifically, the control module performs text analysis and image analysis according to the printing file to obtain the part size, the part outline and the part material; wherein the text analysis and image analysis can be operated and processed by a preset analysis strategy; the control module performs calculation according to the part size and the powder thickness to obtain the number of powder layers; wherein the calculation can be a division calculation, and when there is a remainder, the remainder can be used as the powder thickness of the last layer. In this way, the powder thickness, the number of powder layers, the part outline and the part material constitute the printing parameters.

[0091] Through the above embodiments, it can be known that the part size, part contour and part material can be obtained by analyzing the printing file; the number of powder layers can be determined using the part size and the preset powder thickness; in this way, the powder thickness, the number of powder layers, the part contour and the part material constitute the printing parameters, so that the printing parameters can be used for subsequent targeted processing, thereby improving the printing accuracy and printing efficiency.

[0092] The powder spreading unit 120 is used for the control module to control the printing module to perform powder spreading processing based on the printing parameters to obtain a powder spreading contour.

[0093] In this embodiment, the printing module, under the control of the control module, performs powder spreading processing according to the printing parameters to obtain the powder spreading contour, that is, the printing module uses the powder spreading thickness, the number of powder spreading layers, the part contour and the part material to perform powder spreading processing to obtain the powder spreading contour.

[0094] In one embodiment, the printing module further includes a scraper, a silo and a forming silo; the control module controls the printing module to perform powder spreading processing based on the printing parameters to obtain a powder spreading profile, including:

[0095] Obtaining corresponding material powder from the silo based on the part material;

[0096] Determine a plurality of part sub-contours using the part contour and the number of powder layers;

[0097] Obtain a part sub-contour as the current part sub-contour based on a preset sequence to determine the powder spreading size;

[0098] Controlling the scraper to start, the scraper sets the size of the material powder to the powder spreading size and sets the thickness of the material powder to the corresponding powder spreading thickness on the working surface of the forming bin, so as to determine the powder spreading sub-contour corresponding to the current part sub-contour;

[0099] Control the scraper to retract.

[0100] In this embodiment, the scraper can be arranged on one side or above the forming bin; the material bin is arranged above the forming bin, and can be lifted and lowered when obtaining the corresponding material powder; the forming bin is a plane, which may include a working surface (or powder bed) and a forming cylinder; wherein the working surface is a part of the forming bin; the forming cylinder is arranged within the range of the working surface, and can be lifted and lowered, which is equivalent to a lifting platform.

[0101] The silo stores powders formed after various part materials are crushed; the material powder refers to the powder corresponding to the part material obtained from the silo.

[0102] Specifically, the control module obtains the corresponding material powder from the silo according to the part material, and uses the part contour and the number of powder layers to determine multiple part sub-contours, that is, each number of powder layers corresponds to a part sub-contour; at the same time, the control module obtains a part sub-contour as the current part sub-contour based on the preset order to determine the powder spreading size, including: obtaining a part sub-contour from multiple part sub-contours as the current part sub-contour in the preset order, and obtaining the length and width of the current part sub-contour, and taking the length and the width as the powder spreading size; wherein the length refers to the highest point and the lowest point of the current part sub-contour. The distance between them; the width refers to the distance between the leftmost point to the rightmost point of the current part sub-contour; the preset order can be a bottom-to-top order; the control module controls the scraper to start, and controls the scraper to unfold; the control module controls the scraper to perform powder spreading on the forming cylinder in the working surface, gathers the material powder to spread the size of the material powder as the powder spreading size, and spreads the thickness of the material powder as the powder spreading thickness, that is, the size of the material powder is equal to the powder spreading size, and the thickness of the material powder is equal to the powder spreading thickness; in this way, the powder spreading sub-contour corresponding to the current part sub-contour is determined; the control module controls the scraper to be retracted.

[0103] Through the above embodiments, it can be known that the material powder is obtained by combining the part material with the material bin, and multiple part sub-contours are determined by using the part contour and the number of powder spreading layers. A part sub-contour obtained based on a preset sequence is used as the current part sub-contour to determine the powder spreading size; the scraper is controlled to start, and the scraper spreads the size of the material powder as the powder spreading size on the working surface of the forming bin, and spreads the thickness of the material powder as the corresponding powder spreading thickness, so as to determine the powder spreading sub-contour corresponding to the current part sub-contour. Therefore, the automatic determination of the powder spreading sub-contour corresponding to the current part sub-contour is achieved, and the printing efficiency is improved, so that the powder spreading sub-contour can be used for subsequent targeted processing.

[0104] The detection unit 130 is used to send a first printing signal to the control module after the monitoring module detects that the printing module has completed the powder spreading process.

[0105] In this embodiment, the monitoring module detects the working status of the printing module in real time, generates the first printing signal after detecting that the printing module has completed the powder spreading process, and sends the first printing signal to the control module.

[0106] The printing unit 140 is used for the control module to control the annular spot laser to perform laser printing on the powder spreading contour to obtain a first printed part based on the first printing signal and the printing parameters.

[0107] In one embodiment, the printing module further includes a scanner; the control module controls the annular spot laser to perform laser printing on the powder spreading contour to obtain a first printed part based on the first printing signal and the printing parameters, including:

[0108] In response to the first printing signal, controlling the scanner to determine a printing path based on the current part sub-contour;

[0109] Based on the printing path, the first beam power and the second beam power of the annular spot laser are correspondingly allocated, and the annular spot laser is turned on to emit the first beam and the second beam, the first beam is at the first beam power and the second beam is at the second beam power, so as to perform laser melting processing on the material powder within the range of the printing path in the powder laying contour to obtain the first printed part;

[0110] Turn off the annular spot laser.

[0111] In this embodiment, the annular spot laser can emit two light beams, namely the first light beam and the second light beam; the first light beam is emitted according to the first beam power, and the second light beam is emitted according to the second beam power; and the first beam power and the second beam power can be equal or unequal, that is, the first beam power can be equal to or unequal to the second beam power. It should be noted that the power of the first beam can be equal to 0 watts (W) or the power of the second beam can be equal to 0 watts (W); in this way, the two beams that can be emitted by the annular spot laser have three situations; the first situation is that the power of the first beam is equal to 0 watts (W) and the power of the second beam is greater than 0 watts (W), that is, the first beam is not emitted, and only the second beam emits a point-shaped beam according to the power of the second beam; the second situation is that the power of the first beam is greater than 0 watts (W) and the power of the second beam is equal to 0 watts (W), that is, the second beam is not emitted, and only the first beam emits an annular beam according to the power of the first beam; the third situation is that the power of the first beam is greater than 0 watts (W) and the power of the second beam is greater than 0 watts (W), that is, the first beam emits an annular beam according to the first beam power, and the second beam emits a point-shaped beam according to the second beam power. At this time, the annular beam combined with the point-shaped beam can form a saddle-shaped beam, that is, the first beam is an annular beam, the second beam is a point-shaped beam, and the first beam surrounds the second beam. Therefore, the first beam power and the second beam power can be intelligently allocated in real time according to the printing path at different positions to perform laser melting processing more quickly. Moreover, laser light sources play a key role in the development of additive manufacturing. Usually, the output power of the laser can be adjusted in time with high frequency, but its spatial intensity distribution is fixed. In order to improve productivity, the beam profile must be adjusted immediately to match the required structural size; while laser printing combined with annular spot laser uses annular spot laser to quickly switch the size (i.e., beam power) and shape (i.e., point shape, ring shape, saddle shape) of the output beam, so that the beam profile can be adjusted between single mode (i.e., point shape) and ring shape to obtain various shapes between the two. When interacting with the material powder, the soot and splash generated are significantly reduced. In contrast, annular beams and saddle beams (i.e., annular beams with a certain intensity in the center) can produce uniform lateral temperature distribution and wide and flat track cross-sections in the material powder during laser melting processing, and soot and splash are also greatly reduced, so that higher laser power, faster scanning speed, and larger process window can be used to effectively improve the printing speed.

[0112] The two types of beams that can be emitted by the annular spot laser change the Gaussian intensity distribution characteristics of the laser, increase the spot diameter, and make the energy distribution more uniform, which can effectively reduce spatter and defects, thereby improving printing efficiency; at the same time, in order to maintain the accuracy of the lattice, thin wall and contour, a small beam diameter laser is still required. Therefore, a laser powder bed beam shaping printing technology solution combined with an annular spot laser is proposed. Moreover, laser light sources play a key role in the development of additive manufacturing. Usually, the output power of the laser can be adjusted in time with high frequency, but its spatial intensity distribution is fixed. In order to improve productivity, the beam profile must be adjusted in real time to match the required structural size. The technical solution for laser printing combined with the annular spot laser is to use the annular spot laser to quickly switch the size and shape of the output beam, so that the beam profile can be adjusted between single mode and annular, and various shapes between the two can be obtained. When interacting with the material powder, the soot and spatter generated are significantly reduced.

[0113] Specifically, after receiving the first printing signal, the control module controls the galvanometer in the scanner to scan the printing path according to the current sub-contour; at the same time, the control module automatically allocates the first beam power and the second beam power of the annular spot laser based on the printing path, that is, for different positions in the printing path, the magnitude of the first beam power may be different, and the magnitude of the second beam power may also be the same, which can be specifically set according to the position of the printing path; the annular spot laser is turned on to emit the first beam and the second beam, and the first beam is according to the first beam power and the second beam is according to the second beam power through the transmission collimator and beam expander in the collimator expander and the galvanometer and field lens in the scanner to perform laser melting processing on the material powder within the range of the printing path in the powder-laying sub-contour to obtain the first printed part; the control module turns off the annular spot laser. It should be noted that the point laser (i.e., the second beam) at the center of the formed annular beam can maintain high-precision printing of the contour and the inner flow channel. When scanning the outer edge contour of the material powder within the range of the printing path in the powder-laying contour, only the center point laser (i.e., the second beam) is retained to reduce the spot diameter and the point spot power, and the single-mode Gaussian beam (i.e., the second beam) in the center is used to achieve high-precision printing and fine features of the inner and outer surface contours. In addition, the annular beam (i.e., the first beam) generated by the annular spot laser can realize local regulation of microstructure and material properties, and specifically regulate the organizational characteristics of the key parts of the parts to be printed, and improve the mechanical properties of the key structural parts; since the shape of the point ring beam (i.e., the first beam and the second beam) can be changed in real time, by configuring the working mode of the internal and external laser spots, the thermal gradient and solidification dynamics in the molten pool (i.e., the material powder that needs to be melted or has been melted within the range of the printing path in the powder-laying contour) are controlled, and the microstructure of the material is further designed and adjusted, thereby giving new functions and optimized characteristics to the entire part, and improving the ultimate tensile strength or ultimate strain of the key parts of the part. Therefore, during the printing process, the annular spot profiles formed by the first and second beams can be adjusted instantly to change the geometry and temperature regulation of the melting track, and by selecting a specific beam profile to strategically control grain growth, the properties of the formed component can be fine-tuned to make specific parts of the component particularly hard or flexible without any subsequent processing work.

[0114] Through the above embodiments, it can be known that after receiving the first printing instruction, the control module controls the scanner in the printing module to scan the printing path according to the current part sub-contour, and automatically allocates the first beam power and the second beam power of the annular spot laser based on the printing path, and the first beam is laser-melted according to the first beam power and the second beam is laser-melted according to the second beam power through the collimator expander and the scanner to obtain the formed first printed part. Therefore, the first beam power and the second beam power are automatically allocated according to the determined printing path, so that the material powder within the range of the printing path in the powder sub-contour is laser-melted according to the first beam power and the second beam power to obtain the formed first printed part, thereby improving the printing efficiency, so that the first printed part can be used for subsequent targeted processing.

[0115] In one embodiment, after the control module controls the annular spot laser to perform laser printing on the powder spreading contour to obtain a first printed part based on the first printing signal and the printing parameters, the device further includes:

[0116] The monitoring module detects that the annular spot laser turns off the first light beam and the second light beam, and sends a second printing signal to the control module.

[0117] In this embodiment, the monitoring module detects the working status of the annular spot laser in real time; when the control module controls the annular spot laser to turn off, that is, the annular spot laser turns off the first light beam and the second light beam; at this time, the monitoring module detects that the annular spot laser turns off the first light beam and the second light beam, generates the second printing signal, and sends the second printing signal to the control module.

[0118] Through the above embodiments, it can be known that the monitoring module detects that the annular spot laser turns off the first light beam and the second light beam, and sends the second printing signal to the control module. Therefore, automatic monitoring and sending of the second printing signal are realized, and the printing efficiency and printing accuracy are improved, so that the second printing signal can be used for subsequent targeted processing.

[0119] In one embodiment, the printing module further includes a single-mode enhanced laser; after the monitoring module detects that the annular spot laser turns off the first light beam and the second light beam and sends a second printing signal to the control module, the device further includes:

[0120] The control module turns on the single-mode enhanced laser in response to the second printing signal;

[0121] The control module controls the single-mode strengthening laser to perform laser strengthening processing on the first printed part according to a preset strengthening power to obtain a target sub-part corresponding to the current part sub-contour;

[0122] The control module turns off the single-mode enhanced laser.

[0123] In this embodiment, after receiving the second printing signal, the control module controls the single-mode strengthening laser to turn on; the control module controls the single-mode strengthening laser to emit a point-shaped beam to the first printed part according to the preset strengthening power to perform laser strengthening processing to obtain the target sub-part corresponding to the sub-contour of the current part; the control module turns off the single-mode strengthening laser. The preset strengthening power can be set according to the specific actual situation.

[0124] The single-mode strengthening laser emits a point-shaped beam to the first printed part according to the strengthening power to perform laser strengthening treatment to obtain the target sub-part corresponding to the current part sub-contour. The single-mode strengthening laser emits a point-shaped beam to the first printed part according to the strengthening power to perform laser strengthening treatment on the first printed part. In this way, the extremely high peak power density of the ultrafast laser emitted by the single-mode strengthening laser can generate a strong plasma on the surface of the formed first printed part. The shock wave formed by the rapid expansion of the plasma can generate a large pressure on the surface of the first printed part, introduce residual compressive stress, and improve the surface properties of the material. That is, the single-mode strengthening laser uses the physical process of the interaction between the ultrafast laser and the material of the first printed part to generate the plasma shock wave mechanical effect for surface modification treatment. When the shock wave pressure is greater than the elastic limit of the material, permanent plastic deformation will occur, thereby improving the mechanical properties of the material surface.

[0125] In one embodiment, after shutting down the single-mode enhanced laser, the device further comprises:

[0126] After the control module turns off the single-mode enhanced laser, the device further includes:

[0127] The monitoring module detects that the single-mode enhanced laser is turned off and sends a third printing signal to the control module;

[0128] The control module lowers the forming cylinder in the working surface to a height of the powder spreading thickness based on the third printing signal;

[0129] The control module obtains the next part sub-contour as the current part sub-contour based on the preset sequence, and controls the printing module to perform powder spreading processing on the target sub-part based on the printing parameters to obtain a powder spreading sub-contour corresponding to the current part sub-contour;

[0130] After the monitoring module detects that the printing module has completed the powder spreading process, the monitoring module sends the first printing signal to the control module;

[0131] The control module controls the printing module to perform laser printing on the powder-laying sub-contour based on the first printing signal and the printing parameters to obtain a target sub-part corresponding to the current part sub-contour;

[0132] Until each part sub-contour is powder-coated and laser-printed to obtain the target part.

[0133] In this embodiment, the monitoring module detects the working state of the single-mode enhanced laser in real time; the control module controls the single-mode enhanced laser to be turned off. At this time, the monitoring module detects that the single-mode enhanced laser is turned off, generates the third printing signal, and sends the third printing signal to the control module; after receiving the third printing signal, the control module lowers the forming cylinder in the working surface to the height of the powder thickness corresponding to the current part sub-contour; at the same time, the control module obtains the next part sub-contour among the multiple part sub-contours as the current part sub-contour based on the preset sequence, and controls the printing module to perform powder spreading processing on the basis of the target sub-part based on the printing parameters to obtain the powder spreading sub-contour corresponding to the current part sub-contour; after the monitoring module detects that the printing module completes the powder spreading processing, it sends the first printing signal to the control module; the control module controls the printing module to perform laser printing on the powder spreading sub-contour based on the first printing signal and the printing parameters to obtain the target sub-part corresponding to the current part sub-contour; the above steps are looped until each part sub-contour is subjected to powder spreading processing and laser printing to obtain the target part.

[0134] Through the above embodiments, it can be known that the control module controls the scanner to determine the printing path of the current part sub-contour based on the first printing instruction, and automatically allocates the first beam power and the second beam power of the annular spot laser based on the printing path, and the first beam is laser-melted according to the first beam power and the second beam is laser-melted according to the second beam power through the collimator expander and the scanner on the material powder within the range of the printing path in the powder-laying sub-contour to obtain the formed first printed part; and the control module controls the opening of the single-mode strengthening laser based on the first printing instruction to perform laser strengthening processing on the first printed part according to the preset strengthening power to obtain the target sub-part corresponding to the current part sub-contour; When the control module lowers the forming cylinder in the working surface to the height of the powder-spreading thickness based on the third printing signal, and the control module obtains the next part sub-contour as the current part sub-contour based on the preset order, and controls the printing module to perform powder-spreading processing on the basis of the target sub-part based on the printing parameters to obtain the powder-spreading sub-contour corresponding to the current part sub-contour; after the monitoring module detects that the printing module has completed the powder-spreading processing, it sends the first printing signal to the control module; the control module controls the printing module to perform laser printing on the powder-spreading sub-contour based on the first printing signal and the printing parameters to obtain the target sub-part corresponding to the current part sub-contour; until each part sub-contour is subjected to powder-spreading processing and laser printing to obtain the target part. The processing of automated scanning, distribution, laser melting, descending, powder-spreading, laser printing, etc. is realized to obtain the target part of the part to be printed, thereby improving the printing efficiency.

[0135] It should be noted that those skilled in the art can clearly understand that the specific implementation process of the above-mentioned device and each user can refer to the corresponding description in the aforementioned method embodiment, and for the convenience and brevity of description, it will not be repeated here.

[0136] The above device can be implemented in the form of a computer program. The computer program can be Figure 3 Runs on the computer device shown.

[0137] See also Figure 3 , Figure 3 1 is a schematic block diagram of a computer device 500 provided in an embodiment of the present application. The computer device 500 includes terminal devices such as computers and servers. Figure 3 As shown, the computer device 500 includes a processor 502 , a memory, and a network interface 505 connected via a system bus 501 , wherein the memory may include a non-volatile storage medium 503 and an internal memory 504 .

[0138] The non-volatile storage medium 503 can store an operating system 5031 and a computer program 5032. When the computer program 5032 stored in the non-volatile storage medium is executed by the processor 502, the laser printing method based on the annular spot laser described above can be implemented. The processor 502 is used to provide computing and control capabilities to support the operation of the entire computer device 500. The internal memory 504 provides an environment for the operation of the computer program in the non-volatile storage medium. When the computer program is executed by the processor 502, the processor 502 can execute the laser printing method based on the annular spot laser described above. The network interface 505 is used for network communication. It can be understood by those skilled in the art that the structure shown in the figure is only a block diagram of a part of the structure related to the scheme of the present invention, and does not constitute a limitation on the device to which the scheme of the present invention is applied. The specific device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0139] The processor 502 is used to run the computer program stored in the memory to implement the following steps:

[0140] In response to the start printing instruction, the control module obtains printing parameters of the part to be printed;

[0141] The control module controls the printing module to perform powder spreading processing based on the printing parameters to obtain a powder spreading contour;

[0142] After the monitoring module detects that the printing module has completed the powder spreading process, the monitoring module sends a first printing signal to the control module;

[0143] The control module controls the annular spot laser to perform laser printing on the powder spreading contour to obtain a first printed part based on the first printing signal and the printing parameters.

[0144] It should be understood that in the embodiment of the present application, the processor 502 may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0145] It can be understood by those skilled in the art that all or part of the processes in the method for implementing the above embodiment can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a storage medium, which can be a computer-readable storage medium. The computer program is executed by at least one processor in the computer system to implement the process steps of the embodiment of the above method.

[0146] Therefore, an embodiment of the present application further provides a storage medium. The storage medium may be a computer-readable storage medium, and the computer-readable storage medium includes a non-volatile computer-readable storage medium. The storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0147] In response to the start printing instruction, the control module obtains printing parameters of the part to be printed;

[0148] The control module controls the printing module to perform powder spreading processing based on the printing parameters to obtain a powder spreading contour;

[0149] After the monitoring module detects that the printing module has completed the powder spreading process, the monitoring module sends a first printing signal to the control module;

[0150] The control module controls the annular spot laser to perform laser printing on the powder spreading contour to obtain a first printed part based on the first printing signal and the printing parameters.

[0151] The storage medium may be a USB flash drive, a mobile hard disk, a read-only memory (ROM), a magnetic disk, or an optical disk, etc., which are computer-readable storage media that can store program codes.

[0152] In the several embodiments provided in this application, it should be understood that the disclosed devices, equipment and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, and the division of the units is only a logical function division, and there may be other division methods in actual implementation. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the devices, equipment and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0153] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A laser printing method based on an annular spot laser, characterized in that: A control module applied to a laser printing system, wherein the control module is in communication connection with a monitoring module and a printing module in the laser printing system; the printing module comprises an annular spot laser; The laser printing method based on the annular spot laser comprises: In response to the start printing instruction, the control module obtains printing parameters of the part to be printed; The control module controls the printing module to perform powder spreading processing based on the printing parameters to obtain a powder spreading contour; After the monitoring module detects that the printing module has completed the powder spreading process, the monitoring module sends a first printing signal to the control module; The control module controls the annular spot laser to perform laser printing on the powder spreading contour to obtain a first printed part based on the first printing signal and the printing parameters.

2. The method according to claim 1, characterized in that: The control module obtains printing parameters of the part to be printed, including: Analyze the part size, part outline and part material based on the printing file; Determining the number of powder spreading layers based on the part size and a preset powder spreading thickness; The printing parameters are composed based on the powder thickness, the number of powder layers, the part contour and the part material.

3. The method according to claim 2, characterized in that The printing module further includes a scraper, a silo and a forming silo; the control module controls the printing module to perform powder spreading processing based on the printing parameters to obtain a powder spreading profile, including: Obtaining corresponding material powder from the silo based on the part material; Determine a plurality of part sub-contours using the part contour and the number of powder layers; Obtain a part sub-contour as the current part sub-contour based on a preset sequence to determine the powder spreading size; Controlling the scraper to start, the scraper sets the size of the material powder to the powder spreading size and sets the thickness of the material powder to the corresponding powder spreading thickness on the working surface of the forming bin, so as to determine the powder spreading sub-contour corresponding to the current part sub-contour; Control the scraper to retract.

4. The method according to claim 3, characterized in that The printing module further includes a scanner; the control module controls the annular spot laser to perform laser printing on the powder spreading contour to obtain a first printed part based on the first printing signal and the printing parameters, including: In response to the first printing signal, controlling the scanner to determine a printing path based on the current part sub-contour; Based on the printing path, the first beam power and the second beam power of the annular spot laser are correspondingly allocated, and the annular spot laser is turned on to emit the first beam and the second beam, the first beam is at the first beam power and the second beam is at the second beam power, so as to perform laser melting processing on the material powder within the range of the printing path in the powder laying contour to obtain the first printed part; Turn off the annular spot laser.

5. The method according to claim 4, characterized in that After the control module controls the annular spot laser to perform laser printing on the powder spreading contour based on the first printing signal and the printing parameters to obtain a first printed part, the method further includes: The monitoring module detects that the annular spot laser turns off the first light beam and the second light beam, and sends a second printing signal to the control module.

6. The method according to claim 5, characterized in that The printing module further includes a single-mode enhanced laser; after the monitoring module detects that the annular spot laser turns off the first light beam and the second light beam and sends a second printing signal to the control module, the method further includes: The control module turns on the single-mode enhanced laser in response to the second printing signal; The control module controls the single-mode strengthening laser to perform laser strengthening processing on the first printed part according to a preset strengthening power to obtain a target sub-part corresponding to the current part sub-contour; The control module turns off the single-mode enhanced laser.

7. The method according to claim 6, characterized in that After the control module turns off the single-mode enhanced laser, the method further includes: The monitoring module detects that the single-mode enhanced laser is turned off and sends a third printing signal to the control module; The control module lowers the forming cylinder in the working surface to a height of the powder spreading thickness based on the third printing signal; The control module obtains the next part sub-contour as the current part sub-contour based on the preset sequence, and controls the printing module to perform powder spreading processing on the target sub-part based on the printing parameters to obtain a powder spreading sub-contour corresponding to the current part sub-contour; After the monitoring module detects that the printing module has completed the powder spreading process, the monitoring module sends the first printing signal to the control module; The control module controls the printing module to perform laser printing on the powder-laying sub-contour based on the first printing signal and the printing parameters to obtain a target sub-part corresponding to the current part sub-contour; Until each part sub-contour is powder-coated and laser-printed to obtain the target part.

8. A laser printing device based on an annular spot laser, characterized in that: A control module applied to a laser printing system, wherein the control module is in communication connection with a monitoring module and a printing module in the laser printing system; the printing module comprises an annular spot laser; The laser printing device based on the annular spot laser comprises: An acquisition unit, in response to a start printing instruction, controls the module to acquire printing parameters of the part to be printed; A powder spreading unit, wherein the control module controls the printing module to perform powder spreading processing based on the printing parameters to obtain a powder spreading contour; A detection unit, wherein after the monitoring module detects that the printing module has completed the powder spreading process, the monitoring module sends a first printing signal to the control module; The printing unit, the control module controls the annular spot laser to perform laser printing on the powder spreading contour to obtain a first printed part based on the first printing signal and the printing parameters.

9. A computer device, characterized in that: The computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the method according to any one of claims 1 to 7 when executing the computer program.

10. A storage medium, characterized in that: The storage medium stores a computer program, wherein the computer program includes program instructions, and when the program instructions are executed by a processor, the method according to any one of claims 1 to 7 can be implemented.

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