Powder bed additive manufacturing system based on surface printing

Abstract

The invention discloses a powder bed additive manufacturing system based on surface printing, and belongs to the technical field of additive manufacturing, the powder bed additive manufacturing system comprises a sealed chamber and an engineering preparation module, and the top of the inner side of the sealed chamber is provided with a three-dimensional movement mechanism; according to the invention, the powder spreading monitoring device is arranged on the powder spreading printing mechanism, so that the states of the powder cylinder and the forming cylinder can be monitored in real time, a user can intuitively know the printing and powder spreading process and find out the problems of equipment in time, and the scraper blade monitoring device can be used for monitoring the scraper blade and detecting whether the scraper blade is abraded or not; the situation that the abraded scraping plate continues to be used and influences flatness of powder laying is avoided, measures can be taken in time for maintenance and adjustment, it can be guaranteed that the laser head is in a normal working range through the laser monitoring device and the laser debugging module, and normal output of the laser head is guaranteed; printing failure caused by laser head faults or incorrect parameters is prevented, printing reliability and stability are improved, and printing failure caused by laser head problems is avoided.

Description

Technical Field

[0001] This invention belongs to the field of additive manufacturing technology, specifically relating to a powder bed additive manufacturing system based on surface printing. Background Technology

[0002] In recent years, 3D printing technology has developed rapidly as an emerging manufacturing technology. Based on digital models, it manufactures three-dimensional objects by layering materials. Compared with traditional subtractive manufacturing methods, it has advantages such as being able to manufacture complex-shaped parts, reducing material waste, and shortening product development cycles.

[0003] Traditional powder bed additive manufacturing systems often focus only on some key parameters during printing, while ignoring the status of equipment such as powder cylinders, forming cylinders, and doctor blades, as well as basic information parameters of circulation and chamber systems. This results in insufficient monitoring of the printing process, making it impossible to comprehensively monitor key information such as equipment status and printing environment. Furthermore, it lacks effective storage and traceability functions for key equipment parameters and processes, making it difficult to accurately find the cause when quality problems occur.

[0004] To avoid the aforementioned technical problems, it is indeed necessary to provide a powder bed additive manufacturing system based on surface printing to overcome the deficiencies in the prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a powder bed additive manufacturing system based on surface printing to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a powder bed additive manufacturing system based on surface printing, comprising a sealed chamber and an engineering preparation module. A three-dimensional motion mechanism is provided on the top inner side of the sealed chamber. A powder-laying printing mechanism is provided inside the sealed chamber. A movable plate is provided on one side of the sealed chamber. The powder-laying printing mechanism includes a motor, with a lead screw at the output end of the motor. A movable block is threadedly connected to the outer side of the lead screw. A connecting plate is provided on the top of the movable block. Storage boxes are provided at both ends of the top of the connecting plate. A powder cylinder is provided on one side of the storage box. A forming cylinder is provided on one side of the powder cylinder. A forming platform is provided inside the forming cylinder. A second hydraulic telescopic rod is provided at the bottom of the forming platform. A powder-laying monitoring device is provided on one side of the connecting plate. A limit rod is connected to the outer side of the connecting plate via the movable block. A push plate is provided inside the powder cylinder. A first hydraulic telescopic rod is provided at the bottom of the push plate. The output end of the engineering preparation module is connected to the input end of the processing module. The output end of the processing module is connected to the input end of the powder preparation system module. The output end of the powder preparation system module is connected to the input end of the system setting module.

[0007] As a preferred embodiment, the engineering preparation module includes a file import and format conversion module, a multi-part multi-process setting module, and a part position preview module. The file import and format conversion module is used to receive part engineering file models generated by path planning software and identify the file format. The multi-part multi-process setting module is used to set process parameters for each part according to different requirements of the parts. The part position preview module is used to generate a position preview image of the part on the printing platform according to the set process parameters and part information, and mark each part with a different color.

[0008] As a preferred embodiment, the processing module includes a manual printing module and an automatic printing module. The manual printing module is used to manually control the powder spreading equipment, set the powder spreading thickness and speed, and observe the uniformity and flatness of the powder spreading. The bottom of the three-dimensional motion mechanism is equipped with a laser head, and the top of the three-dimensional motion mechanism is equipped with a laser monitoring device.

[0009] As a preferred embodiment, the automatic printing module is used to set the preheating time and power of the laser head according to the material and process requirements of the part, start the laser head preheating program, monitor the temperature and power changes of the laser head, ensure that the laser head reaches a stable working state, and automatically control the powder spreading equipment to perform powder spreading operation according to the preset powder spreading parameters.

[0010] As a preferred embodiment, the powder preparation system module includes a parameter configuration module, a position adjustment module, and a status monitoring module. The parameter configuration module is used to set the step distance of the powder spreading device and select an appropriate step distance according to the characteristics of the powder and printing requirements. The position adjustment module is used to adjust the position of the powder spreading device by manually operating the control buttons, and can move it in the up-down, left-right, left-right, and forward-backward directions. The status monitoring module is used to monitor the height and remaining amount of powder in the powder cylinder in real time, and at the same time, monitor environmental factors such as the temperature and humidity of the powder in the powder cylinder, and monitor the height and shape information of the printed part in the forming cylinder.

[0011] As a preferred embodiment, the system setting module includes a motion board initialization module, a system parameter setting module, a powder bed motion parameter setting module, a laser debugging module, and a valve body airflow debugging module. The motion board initialization module is used to specify the motion position of the moving equipment according to the structure and working principle of the equipment. The system parameter setting module is used to identify the global variable parameters that need to be set in the system. The powder bed motion parameter setting module is used to configure the stepping distance of the powder cylinder and the stepping distance of the forming cylinder according to the characteristics of the powder and printing requirements. The laser debugging module is used to control the switching of the laser head. The valve body airflow debugging module is used for basic information parameter monitoring, monitoring the real-time values ​​of basic information parameters in the circulation system and the chamber system.

[0012] As a preferred embodiment, the bottom sides of the movable plate are respectively provided with pressure rollers and scrapers, the inside side of the sealed chamber is provided with a slide rail, the slide rail is connected to the movable plate, and the inside sides of the sealed chamber are provided with scraper monitoring devices.

[0013] As a preferred embodiment, the upper part of the sealed chamber is provided with a first sealing door on one side, and the lower part of the sealed chamber is provided with a second sealing door.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] This invention, by installing a powder-spreading monitoring device on the powder-spreading printing mechanism, can monitor the status of the powder cylinder and forming cylinder in real time, allowing users to intuitively understand the powder-spreading process and promptly identify potential equipment problems. The installed scraper monitoring device can monitor the scraper to detect wear, preventing worn scrapers from affecting the evenness of powder spread and facilitating timely maintenance and adjustment to ensure smooth printing. The installed laser monitoring device and laser debugging module ensure the laser head is within its normal operating range, guaranteeing normal laser head output and preventing printing failures due to laser head malfunction or incorrect parameters, thus improving printing reliability and stability and avoiding printing failures caused by laser head problems.

[0016] This invention, through its file import and format conversion module, ensures that the system can handle part engineering files from various sources, improving system compatibility and versatility. This allows files generated by different design software to be used within the system. Furthermore, it enables monitoring of file sources, allowing for timely identification of the cause of printing problems. The multi-part, multi-process setting module allows for printing different parts within the same batch using different processes, improving equipment utilization and production flexibility. It can produce parts with different structural and performance requirements. The part position preview module allows users to intuitively understand the layout of parts on the printing platform, identifying potential layout problems in advance, improving printing accuracy and efficiency, and preventing printing failures caused by collisions between parts.

[0017] This invention allows for the reasonable configuration of parameters through a parameter configuration module, enabling the equipment to be adjusted to its optimal state to prepare for processing and printing. This ensures the accuracy and stability of the powder spreading process, improves print quality, and ensures the accurate positioning of the powder spreading equipment through a position adjustment module. This provides a guarantee for the powder spreading operation, ensuring that the powder spreading process can proceed smoothly and avoiding uneven powder spreading or missed areas due to inaccurate positioning.

[0018] This invention, through a motion board initialization module, ensures that the motion equipment is in a ready and normal state, providing a basic guarantee for motion control of the equipment, preventing printing errors caused by motion equipment malfunction or inaccurate positioning, and ensuring normal operation of the equipment. The system parameter setting module calibrates system parameters according to different equipment conditions, ensuring accurate positioning during printing, improving the system's adaptability to different equipment, ensuring printing accuracy and stability, and avoiding printing failures due to improper parameter settings. The toner bed motion parameter setting module allows the toner bed's movement to reach a suitable state with the environment, ensuring normal operation of the toner bed and toner spreading quality, improving printing quality and efficiency, and avoiding printing failures due to improper toner bed parameter settings. The airflow adjustment module ensures a stable printing environment, providing stable environmental conditions for the printing process, which is beneficial for improving printing quality and avoiding printing failures due to environmental instability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention from the front view;

[0020] Figure 2 This is a schematic diagram of the three-dimensional cross-section structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the powder-spreading printing mechanism of the present invention;

[0022] Figure 4 This is a schematic diagram of the powder bed additive manufacturing system of the present invention;

[0023] Figure 5 A schematic diagram of the engineering preparation module for this invention;

[0024] Figure 6 This is a schematic diagram of the processing module of the present invention;

[0025] Figure 7 This is a schematic diagram of the powder preparation system module of the present invention;

[0026] Figure 8 This is a schematic diagram of the system setup module of the present invention.

[0027] In the diagram: 1. Sealed chamber; 2. Three-dimensional motion mechanism; 3. Powder spreading and printing mechanism; 4. Movable plate; 5. Engineering preparation module; 6. Processing module; 7. Powder mixing system module; 8. System setting module; 9. Laser monitoring device; 10. Laser head; 11. Slide rail; 12. First sealing door; 13. Pressure roller; 14. Scraper; 15. Second sealing door; 16. Scraper monitoring device; 301. Motor; 302. Lead screw; 303. Movable block; 304. Connecting plate; 305. Storage box; 306. Powder cylinder; 307. Forming table; 308. Powder spreading monitoring device; 30 9. Limiting rod; 310. Push plate; 311. First hydraulic telescopic rod; 312. Second hydraulic telescopic rod; 313. Forming cylinder; 51. File import and format conversion module; 52. Multi-part multi-process setting module; 53. Part position preview module; 61. Manual printing module; 62. Automatic printing module; 71. Parameter configuration module; 72. Position adjustment module; 73. Status monitoring module; 81. Motion board initialization module; 82. System parameter setting module; 83. Powder bed motion parameter setting module; 84. Laser debugging module; 85. Valve body air field debugging module. Detailed Implementation

[0028] The present invention will be further described below with reference to embodiments.

[0029] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0030] Please see Figure 1-8This invention provides a powder bed additive manufacturing system based on surface printing, including a sealed chamber 1 and an engineering preparation module 5. A three-dimensional motion mechanism 2 is provided on the top inner side of the sealed chamber 1. A powder-laying printing mechanism 3 is provided inside the sealed chamber 1. A movable plate 4 is provided on one side of the interior of the sealed chamber 1. The powder-laying printing mechanism 3 includes a motor 301. A lead screw 302 is provided at the output end of the motor 301. A movable block 303 is threadedly connected to the outer side of the lead screw 302. A connecting plate 304 is provided on the top of the movable block 303. Storage boxes 305 are provided at both ends of the top of the connecting plate 304. A powder cylinder 306 is provided on one side of the storage box 305. A forming cylinder 313 is provided on one side of the forming cylinder 313. A forming platform 307 is provided inside the forming cylinder 313. A second hydraulic telescopic rod 312 is provided at the bottom of the forming platform 307. A powder spreading monitoring device 308 is provided on one side of the connecting plate 304. A limit rod 309 is connected to the outside of the connecting plate 304 through a movable block 303. A push plate 310 is provided inside the powder mixing cylinder 306. A first hydraulic telescopic rod 311 is provided at the bottom of the push plate 310. The output end of the engineering preparation module 5 is connected to the input end of the processing module 6. The output end of the processing module 6 is connected to the input end of the powder mixing system module 7. The output end of the powder mixing system module 7 is connected to the input end of the system setting module 8.

[0031] The engineering preparation module 5 can process the part engineering file model generated by the path planning software into a format supported by the host computer, while also supporting multi-part and multi-process settings. It can also generate part position previews, and parts to be printed can be marked with different colors and boxes in the preview area. The processing module 6 can be divided into manual printing and automatic printing. Manual printing can adjust the powder spreading and scanning functions; automatic printing can print the complete part model, including laser preheating, powder spreading, scanning and other processes. The powder spreading process interacts with the online monitoring software in real time. After scanning, the process is saved to the database. There is also a preview function. The powder spreading system module 7 can quickly complete the configuration of parameters such as step distance and movement speed, manually adjust the position and return to zero with one key, and monitor the status of powder cylinder 306, forming cylinder 313 and scraper 14 in real time.

[0032] like Figure 5As shown, this invention provides an embodiment in which the engineering preparation module 5 includes a file import and format conversion module 51, a multi-part multi-process setting module 52, and a part position preview module 53. The file import and format conversion module 51 is used to receive part engineering file models generated by path planning software, identify the file format, and if the file format is not supported by the host computer, start the format conversion program to convert the file into a format that the host computer can recognize. The multi-part multi-process setting module 52 is used to set process parameters for each part according to different requirements of the parts, such as printing material, layer thickness, fill rate, and support structure, and assign a unique identifier to each part for differentiation and management in subsequent operations. The part position preview module 53 is used to generate a position preview image of the parts on the printing platform according to the set process parameters and part information, mark each part with a different color, mark the selected parts with a box in the preview area, and calculate the spacing and relative position relationship between the parts.

[0033] The file import and format conversion module 51 ensures that the system can handle part engineering files from various sources, improving the system's compatibility and versatility. This allows files generated by different design software to be used in the system. Furthermore, the file source can be monitored. The part position preview module allows users to intuitively understand the layout of the parts on the printing platform, identify potential layout problems in advance, improve printing accuracy and efficiency, and avoid printing failures caused by collisions between parts.

[0034] This invention provides an embodiment in which the processing module 6 includes a manual printing module 61 and an automatic printing module 62. The manual printing module 61 is used to manually control the powder spreading equipment, set the powder spreading thickness and speed, observe the uniformity and flatness of the powder spreading, adjust the parameters according to the actual situation until a satisfactory powder spreading effect is achieved, start the scanning equipment, set the scanning resolution, scanning range and other parameters, observe the scanning results, and check whether the contour and features of the parts can be accurately identified. If the scanning effect is not ideal, adjust the parameters and rescan. Manually adjust the opening and closing angle and projection intensity of the light valve, observe the effect of the light valve projection on the powder bed, and ensure the accuracy and clarity of the projection. The bottom of the three-dimensional motion mechanism 2 is equipped with a laser head 10, and the top of the three-dimensional motion mechanism 2 is equipped with a laser monitoring device 9.

[0035] This invention provides an embodiment in which the automatic printing module 62 is used to set the preheating time and power of the laser head 10 according to the material and process requirements of the part, start the preheating program of the laser head 10, monitor the temperature and power changes of the laser head 10 to ensure that the laser head 10 reaches a stable working state, automatically control the powder spreading equipment to perform powder spreading operation according to the preset powder spreading parameters, and interact with the laser monitoring device 9 in real time during the powder spreading process, feeding back the actual situation of powder spreading to the laser monitoring device 9. The laser monitoring device 9 judges whether the powder spreading quality meets the requirements based on the feedback information. If it does not meet the requirements, it automatically adjusts the powder spreading parameters. According to the contour and features of the part, it automatically sets the scanning parameters, starts the scanning equipment to perform scanning operation, and compares the scanning result with the preset part model. If the scanning result is inconsistent with the model, it automatically adjusts the scanning parameters and rescans. Throughout the printing process, the printing progress and quality of the part are monitored in real time.

[0036] The manual printing module 61 allows for manual adjustments to each step before actual printing, accurately assessing the quality of toner application, printing, and light valve projection. This provides accurate parameters and quality assurance for automatic printing, ensuring that the automatic printing accurately outputs the part model. The automatic printing module efficiently and accurately prints the part model completely onto the work platform, ensuring the quality of each toner layer. It also allows users to monitor the printing progress and quality in real time, improving production efficiency and the controllability of product quality.

[0037] This invention provides an embodiment in which the powder preparation system module 7 includes a parameter configuration module 71, a position adjustment module 72, and a status monitoring module 73. The parameter configuration module 71 is used to set the step distance of the powder spreading device according to the characteristics of the powder and printing requirements, selecting an appropriate step distance to ensure the uniformity and continuity of powder spreading, and setting the moving speed of the powder spreading device. Based on the thickness and area of ​​the powder spread, as well as the flow characteristics of the powder, the moving speed is reasonably adjusted to achieve the best powder spreading effect. The position adjustment module 72 is used to adjust the position of the powder spreading device by manually operating control buttons, allowing for up / down, left / right, and forward / backward movements. The device moves in the same direction to ensure accurate positioning of the powder spreading equipment and coverage of the entire printing area. In case of printing errors, pressing the one-key return-to-zero button will return the powder spreading equipment to its initial position. The status monitoring module 73 is used to monitor the height and remaining amount of powder in the powder cylinder 306 in real time. When the powder height is lower than the set value, an alarm will be issued to prompt the user to add powder. At the same time, the temperature, humidity and other environmental factors of the powder in the powder cylinder 306 will be monitored to ensure that the powder quality meets the requirements. The height and shape information of the printed part in the forming cylinder 313 will be monitored. If an abnormality is found by comparing it with the preset high-quality model, an alarm will be issued in time.

[0038] The parameter configuration module 71 allows for reasonable parameter configuration, bringing the equipment to its optimal state to prepare for printing and ensuring the accuracy and stability of the powder spreading process, thereby improving print quality. The position adjustment module 72 ensures the accurate positioning of the powder spreading equipment, providing a guarantee for the powder spreading operation and ensuring a smooth process. It also prevents uneven powder spreading or missed areas due to inaccurate positioning. The status monitoring module 73 can monitor the status of the powder cylinder 306 and the forming cylinder 313 in real time, allowing users to intuitively understand the printing and powder spreading process, promptly identify potential equipment problems, and detect whether the scraper is worn. This prevents worn scrapers from continuing to be used and affecting the flatness of the powder spreading, facilitating timely maintenance and adjustment measures to ensure the smooth progress of the printing process.

[0039] This invention provides an embodiment in which the system setting module 8 includes a motion board initialization module 81, a system parameter setting module 82, a powder bed motion parameter setting module 83, a laser debugging module 84, and a valve body airflow debugging module 85. The motion board initialization module 81 is used to specify the motion position of the moving equipment according to the structure and working principle of the equipment, ensuring accurate control of the movement of related equipment. When the moving equipment malfunctions or operates abnormally, it executes a board reset function to reinitialize the state of the moving equipment, enabling it to operate normally. The system parameter setting module 82 is used to identify global variable parameters that need to be set in the system. These parameters include the equipment size, accuracy requirements, and printing speed. Based on different equipment conditions, it determines which parameters need to be adjusted. The actual operating conditions are monitored, and the identified parameters are calibrated to find the most suitable parameter values ​​for the equipment. The powder bed motion parameter setting module 83 is used to configure the stepping distance of the powder cylinder 306 and the stepping distance of the forming cylinder 313 according to the characteristics of the powder and printing requirements, ensuring that the movement of the forming cylinder 313 is parallel to that of the powder cylinder 306. The appropriate running speed is selected according to the characteristics of the scraper and the powder spreading requirements. The temperature of the floor is configured according to the characteristics of the powder and the printing requirements. The laser debugging module 84 is used to control the switching of the laser head 10. The valve body air field debugging module 85 is used for basic information parameter monitoring, monitoring the real-time values ​​of basic information parameters in the circulation system and the chamber system, and achieving environmental stability by controlling the switching and parameter settings of cylinders and valves in the two systems.

[0040] The motion board initialization module 81 ensures that the motion equipment is in a ready and normal state, providing a basic guarantee for motion control and ensuring normal operation. The system parameter setting module 82 can calibrate system parameters according to different equipment conditions, ensuring accurate positioning during printing, improving the system's adaptability to different equipment, and ensuring printing accuracy and stability. The toner bed motion parameter setting module 83 can make the toner bed motion and environment reach a suitable state, ensuring normal operation of the toner bed and toner spreading quality, improving printing quality and efficiency. The air field adjustment module 85 can ensure the stability of the printing environment, providing stable environmental conditions for the printing process, which is conducive to improving printing quality. The laser head adjustment module 84 can ensure that the laser head is within the normal working range, ensuring normal laser head output, improving printing reliability and stability, and avoiding printing failures caused by laser head problems.

[0041] The present invention provides an embodiment in which pressure rollers 13 and scrapers 14 are respectively provided on both sides of the bottom of the movable plate 4, a slide rail 11 is provided on one side of the interior of the sealed chamber 1, the slide rail 11 is connected to the movable plate 4, and scraper monitoring devices 16 are provided on both sides of the interior of the sealed chamber 1.

[0042] The present invention provides an embodiment in which a first sealing door 12 is provided on one side of the upper part of the sealed chamber 1, and a second sealing door 15 is provided on the lower part of the sealed chamber 1.

[0043] The working principle and usage process of this invention are as follows: First, the file import and format conversion module 51 receives the part engineering file model generated by the path planning software, identifies the file format, and if the file format is not supported by the host computer, starts the format conversion program to convert the file into a format that the host computer can recognize. Then, the multi-part multi-process setting module 52 sets process parameters for each part according to different requirements, such as printing material, layer thickness, fill rate, and support structure, and assigns a unique identifier to each part for differentiation and management in subsequent operations. Based on the set process parameters and part information, the position of the part on the printing platform is generated. The preview image is generated, with each part marked with a different color. Selected parts are marked with a box in the preview area. The spacing and relative positions between parts are calculated. Then, the manual printing module 61 manually controls the powder spreading equipment, setting the powder thickness and speed, observing the uniformity and smoothness of the powder spreading, and adjusting parameters as needed until a satisfactory powder spreading effect is achieved. Next, the scanning equipment is started, setting parameters such as scanning resolution and scanning range, and observing the scanning results to check if the outline and features of the parts can be accurately identified. If the scanning effect is unsatisfactory, the parameters are adjusted and the scan is repeated. Finally, the automatic printing module 62 sets the laser... The preheating time and power of the laser head 10 are automatically controlled according to preset powder spreading parameters to perform powder spreading operations. Throughout the printing process, the printing progress and quality of the parts are monitored in real time. The parameter configuration module 71 sets the step distance of the powder spreading equipment based on powder characteristics, bit depth, and printing requirements, ensuring uniform and continuous powder spreading. The position adjustment module 72 allows manual adjustment of the powder spreading equipment's position via control buttons, enabling movement in up / down, left / right, and forward / backward directions to ensure accurate positioning and coverage of the entire printing area. The status monitoring module 73 monitors the powder cylinder in real time. Information such as powder height and remaining amount is displayed. When the powder height falls below a set value, an alarm is triggered, prompting the user to add powder. Finally, the motion board initialization module 81 specifies the movement position of the motion equipment based on the equipment's structure and working principle, ensuring accurate control of the relevant equipment's movement. The system parameter setting module 82 identifies the global variable parameters that need to be set in the system, including equipment dimensions, accuracy requirements, and printing speed. The powder bed motion parameter setting module 83 configures the stepping distance of the powder cylinder 306 and the stepping distance of the forming cylinder 313 based on the powder characteristics and printing requirements. This ensures that the action of the forming cylinder 313 is parallel to that of the powder cylinder 306. The appropriate operating speed is selected based on the characteristics of the scraper 14 and powder spreading requirements. The floor temperature is configured based on the powder characteristics and printing requirements. The laser head 10 is switched on and off via the laser adjustment module 84 to perform 3D printing.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A powder bed additive manufacturing system based on surface printing, comprising a sealed chamber (1) and an engineering preparation module (5), characterized in that: The sealed chamber (1) has a three-dimensional motion mechanism (2) on its inner top. The sealed chamber (1) has a powder-spreading printing mechanism (3) inside. A movable plate (4) is located on one side of the sealed chamber (1). The powder-spreading printing mechanism (3) includes a motor (301). A lead screw (302) is located at the output end of the motor (301). A movable block (303) is threaded onto the outer side of the lead screw (302). A connecting plate (304) is located on the top of the movable block (303). Storage boxes (305) are located at both ends of the top of the connecting plate (304). A powder cylinder (306) is located on one side of the storage box (305). A forming cylinder (313) is located on one side of the powder cylinder (306). The interior of the 313) is provided with a forming platform (307), the bottom of the forming platform (307) is provided with a second hydraulic telescopic rod (312), one side of the connecting plate (304) is provided with a powder spreading monitoring device (308), the outer side of the connecting plate (304) is connected to a limit rod (309) through a movable block (303), the interior of the powder cylinder (306) is provided with a push plate (310), the bottom of the push plate (310) is provided with a first hydraulic telescopic rod (311), the output end of the engineering preparation module (5) is connected to the input end of the processing module (6), the output end of the processing module (6) is connected to the input end of the powder mixing system module (7), and the output end of the powder mixing system module (7) is connected to the input end of the system setting module (8).

2. The powder bed additive manufacturing system based on surface printing according to claim 1, characterized in that: The engineering preparation module (5) includes a file import and format conversion module (51), a multi-part multi-process setting module (52), and a part position preview module (53). The file import and format conversion module (51) is used to receive the part engineering file model generated by the path planning software and identify the file format. The multi-part multi-process setting module (52) is used to set process parameters for each part according to different requirements of the part. The part position preview module (53) is used to generate a position preview image of the part on the printing platform according to the set process parameters and part information, and mark each part with a different color.

3. The powder bed additive manufacturing system based on surface printing according to claim 1, characterized in that: The processing module (6) includes a manual printing module (61) and an automatic printing module (62). The manual printing module (61) is used to manually control the powder spreading equipment, set the thickness and speed of powder spreading, and observe the uniformity and flatness of powder spreading. The bottom of the three-dimensional motion mechanism (2) is equipped with a laser head (10), and the top of the three-dimensional motion mechanism (2) is equipped with a laser monitoring device (9).

4. The powder bed additive manufacturing system based on surface printing according to claim 3, characterized in that: The automatic printing module (62) is used to set the preheating time and power of the laser head (10) according to the material and process requirements of the parts, start the preheating program of the laser head (10), monitor the temperature and power changes of the laser head (10), ensure that the laser head (10) reaches a stable working state, and automatically control the powder spreading equipment to perform powder spreading operation according to the preset powder spreading parameters.

5. The powder bed additive manufacturing system based on surface printing according to claim 1, characterized in that: The powder preparation system module (7) includes a parameter configuration module (71), a position adjustment module (72), and a status monitoring module (73). The parameter configuration module (71) is used to set the step distance of the powder spreading device according to the characteristics of the powder and the printing requirements, and to select an appropriate step distance. The position adjustment module (72) is used to adjust the position of the powder spreading device by manually operating the control button, and can move in the up and down, left and right, left and right, and forward and backward directions. The status monitoring module (73) is used to monitor the height and remaining amount of powder in the powder cylinder (306) in real time, and at the same time, monitor the temperature, humidity and other environmental factors of the powder in the powder cylinder (305), and monitor the height and shape information of the printed part in the forming cylinder (313).

6. The powder bed additive manufacturing system based on surface printing according to claim 1, characterized in that: The system setting module (8) includes a motion board initialization module (81), a system parameter setting module (82), a powder bed motion parameter setting module (83), a laser debugging module (84), and a valve body air field debugging module (85). The motion board initialization module (81) is used to specify the motion position of the motion device according to the structure and working principle of the equipment. The system parameter setting module (82) is used to identify the global variable parameters that need to be set in the system. The powder bed motion parameter setting module (83) is used to configure the step distance of the powder cylinder (306) and the step distance of the forming cylinder (313) according to the characteristics of the powder and the printing requirements. The laser debugging module (84) is used to control the switching of the laser head (10). The valve body air field debugging module (85) is used to monitor basic information parameters and monitor the real-time values ​​of basic information parameters in the circulation system and the chamber system.

7. The powder bed additive manufacturing system based on surface printing according to claim 1, characterized in that: The bottom sides of the movable plate (4) are respectively provided with pressure rollers (13) and scrapers (14). The inside side of the sealed chamber (1) is provided with a slide rail (11), which is connected to the movable plate (4). The inside sides of the sealed chamber (1) are provided with scraper monitoring devices (16).

8. The powder bed additive manufacturing system based on surface printing according to claim 1, characterized in that: The upper part of the sealed chamber (1) is provided with a first sealing door (12) on one side, and the lower part of the sealed chamber (1) is provided with a second sealing door (15).

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