Laser powder laying synchronization method and system based on dynamic cooperative control

Abstract

The invention provides a laser powder laying synchronization method and system based on dynamic cooperative control. The laser powder laying synchronization method comprises the steps that the safety scanning range of this time is determined according to infrared monitoring data, and an object to be printed in a scanning area is scanned within the safety scanning range of this time, and setting a corresponding printing priority for the corresponding powder laying area according to the powder laying progress corresponding to each powder laying area, selecting a target powder laying area for the to-be-printed object to carry out laser printing, respectively obtaining a powder use amount corresponding to each target powder laying area, and carrying out powder laying supplement on the target powder laying area after printing is completed. During printing, the powder spreading area with short waiting time is preferentially selected, and synchronous powder spreading work is performed after printing is completed, so that the stability of a molten pool is ensured, and the powder spreading efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser printing, and particularly to a laser powder spreading synchronization method and system based on dynamic cooperative control. Background Art

[0002] The working method of a laser 3D printer is mainly as follows: a layer of powder is spread on the workbench. After sintering or curing, the workbench descends by a certain distance, and then the powder spreading device spreads powder again, followed by sintering or curing again. The above process is repeated until the sintering and curing of the entire three-dimensional part are completed. After completion, the excess powder is removed, and the part is polished, dried, etc. to complete the processing and manufacturing of the entire part. It can be seen from this that powder spreading is an important link in the 3D printing process, and the quality of powder spreading plays a key role in the forming speed, printing accuracy, and product quality of the entire 3D printing. With the development of 3D printing technology, many enterprises have begun to improve the printer to improve the printing efficiency. In fact, the printing speed of the printer is very fast, but it is the powder spreading work that consumes a large amount of time, mainly manifested as: powder spreading is carried out after printing is completed, or the amount of powder to be spread this time is determined according to the actual situation after printing is completed. It is these reasons that have led to the delay of printing efficiency. That is to say, traditional powder spreading calculation requires a large amount of time for preparatory work. At present, how to improve the powder spreading efficiency and how to reduce the powder spreading waiting time have become an urgent problem to be solved.

[0003] Therefore, the present invention provides a laser powder spreading synchronization method and system based on dynamic cooperative control. Summary of the Invention

[0004] The laser powder spreading synchronization method and system based on dynamic cooperative control of the present invention preferentially select the powder spreading area with a short waiting time during printing, and perform synchronous powder spreading work after printing is completed, which not only ensures the stability of the molten pool but also improves the powder spreading efficiency.

[0005] The present invention provides a laser powder spreading synchronization method based on dynamic cooperative control, including: Step 1: Determine the current safety scanning range according to the infrared monitoring data, and scan the object to be printed in the scanning area within the current safety scanning range; Step 2: Set corresponding printing priorities for each powder spreading area according to the powder spreading progress corresponding to each powder spreading area, and select a target powder spreading area for the object to be printed for laser printing; Step 3: Obtain the powder usage amount corresponding to each target powder spreading area respectively, and replenish the powder in the target powder spreading area after printing is completed.

[0006] In an implementable manner, further includes: Obtain the item specifications of the object to be printed, and determine the printing execution range of the target powder spreading area according to the item specifications; Before printing, move the powder spreading device out of the printing execution range; After printing is completed, identify the powder usage range within the printing execution range, and move the powder spreading device into the powder usage range to wait for powder replenishment.

[0007] In an implementable manner, Step 1 includes: Step 11: Collect infrared monitoring data within the specified range of the molten pool to determine the working heat transformation characteristics of the molten pool, combine the heat radiation range to determine the interference information of the molten pool on the scanning area, and construct the current safe scanning range of the scanning area; Step 12: Transfer each object to be printed into the current safe scanning range respectively and perform positioning to obtain several positions to be scanned in the scanning area; Step 13: Control the laser scanning device to scan each position to be scanned respectively to obtain the scanning information corresponding to each object to be printed.

[0008] In an implementable manner, Step 13 includes: Step 131: Deduce the range edge transformation information of the current safe scanning range according to the working heat transformation characteristics, determine the current scanning limit edge corresponding to the laser scanning device at the current moment, establish a first distance vector between each position to be scanned and the current scanning limit edge, and establish a second distance vector between different positions to be scanned; Step 132: Combine the second distance vectors according to the principle of the shortest distance to generate the preliminary current scanning path of the laser scanning device, map each first distance vector onto the preliminary current scanning path respectively, screen the target first distance vectors with the scanning direction opposite to the scanning direction of the preliminary current scanning path and perform path positioning, and use the target first distance vectors to adjust the scanning direction of the preliminary current scanning path; Step 133: If the laser scanning device reaches the path positioning at the current moment, adjust the scanning direction of the laser scanning device, collect the real-time scanning path of the laser scanning device, and when the real-time total length of the path corresponding to the real-time scanning path is consistent with the specified total length of the preliminary current scanning path, determine that the laser scanning device has completed this scan; Step 134: Restore the real-time acquisition information of the laser scanning device according to the real-time scanning path, and divide the restored information according to the positions to be scanned corresponding to each object to be printed to obtain the scanning information corresponding to each object to be printed.

[0009] In an implementable manner, Step 2 includes: Step 21: Obtain the historical working data corresponding to each powder spreading area respectively, construct and run the working model corresponding to each powder spreading area to determine the powder spreading progress corresponding to each powder spreading area, and estimate the powder spreading completion time corresponding to each powder spreading area; Step 22: Set the corresponding printing priority for each powder spreading area according to the sequence of the powder spreading completion times, combine the item outlines corresponding to different objects to be printed, obtain an outline combination without overlapping contour features, set a synchronous printing label for the combined printed object corresponding to the outline combination, and set an independent printing label for the remaining objects to be printed; Step 23: Estimate the powder consumption and powder spreading duration corresponding to each printing label respectively, sort the printing labels in combination with the powder spreading efficiency of the powder spreading device, and generate the item printing order for this printing work; Step 24: Use the printing priority to match each printing label with the corresponding target powder spreading area, generate a printing task to control the laser printing device for laser printing.

[0010] In an implementable manner, Step 3 includes: Step 31: Obtain the real-time printing data corresponding to each target powder spreading area, estimate the printing completion time corresponding to the target powder spreading area, and set the corresponding working schedule for the powder spreading device; Step 32: Collect the real-time powder information corresponding to each target powder spreading area, and determine the powder usage amount when performing printing work in each target powder spreading area; Step 33: Control the powder spreading device to perform powder spreading replenishment for each target powder spreading area according to the working schedule.

[0011] In an implementable manner, It further includes: Collect the first real-time working direction of the laser printing device and the second real-time working direction of the powder spreading device; When the first real-time working direction conflicts with the second real-time working direction, adjust the next working direction of the powder spreading device.

[0012] In an implementable manner, It further includes: Use the infrared monitoring data to construct a working scatter plot of the molten pool, construct several working states when the molten pool performs this printing work, and construct the working heating and melting law of the molten pool; When the error of the working heating and melting law is less than the specified error, perform periodic training on the working heating and melting law to obtain the range transformation law of the current safety scanning range, and construct the preliminary current scanning path of the laser scanning device.

[0013] The present invention provides a laser powder spreading synchronization system based on dynamic cooperative control, including: A safety scanning module, configured to determine the current safety scanning range according to infrared monitoring data, and scan the object to be printed in the scanning area within the current safety scanning range; A printing preparation module, configured to set corresponding printing priorities for the corresponding powder spreading areas according to the powder spreading progress corresponding to each powder spreading area, and select a target powder spreading area for the object to be printed for laser printing; A synchronous powder spreading module, configured to respectively obtain the powder usage amounts corresponding to each target powder spreading area, and perform powder spreading supplementation on the target powder spreading areas after printing is completed.

[0014] In an implementable manner, The safety scanning module includes: A range determination unit, configured to collect infrared monitoring data within a specified range of the molten pool to determine the working heat transformation characteristics of the molten pool, combine the heat radiation range to determine the interference information of the molten pool on the scanning area, and construct the current safety scanning range of the scanning area; A scanning positioning unit, configured to respectively transfer each object to be printed into the current safety scanning range and perform positioning to obtain a plurality of positions to be scanned in the scanning area; A scanning execution unit, configured to control the laser scanning device to scan each position to be scanned respectively to obtain scanning information corresponding to each object to be printed.

[0015] The achievable beneficial effects of the above technical solution are as follows: In order to improve the printing efficiency, it is necessary to both increase the powder spreading speed and reduce the printing waiting time. First, to ensure the safety of each device, the current safety scanning range of the current printing work is determined by processing the infrared monitoring data, and then the object to be printed is scanned within this range. At the same time, according to the powder spreading progress of different powder spreading areas, a suitable powder spreading area is selected for the object to be printed to wait for printing. After the printing work is completed, powder spreading supplementation is performed on the powder spreading areas. In this way, the progress of the printing work and the powder spreading work can be coordinately adjusted, and multiple printers can be controlled simultaneously, improving the efficiency of batch printing, reducing the waiting time during printing, and realizing high-quality and high-speed printing work.

[0016] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the written description and the drawings.

[0017] The technical solution of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0018] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the drawings: Figure 1 It is a schematic diagram of the working process of the laser powder spreading synchronization method based on dynamic cooperative control in the embodiment of the present invention; Figure 2 It is a schematic diagram of the composition of the laser powder spreading synchronization system based on dynamic cooperative control in the embodiment of the present invention. Detailed Embodiments

[0019] The following describes the preferred embodiments of the present invention with reference to the drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustration and explanation of the present invention, and are not intended to limit the present invention.

[0020] Embodiment 1 This embodiment provides a laser powder spreading synchronization method based on dynamic cooperative control, as Figure 1 shown, including: Step 1: Determine the current safety scanning range according to the infrared monitoring data, and scan the object to be printed in the scanning area within the current safety scanning range; Step 2: Set the corresponding printing priority for each powder spreading area according to the powder spreading progress corresponding to each powder spreading area, and select a target powder spreading area for the object to be printed for laser printing; Step 3: Obtain the powder usage amount corresponding to each target powder spreading area respectively, and replenish the powder in the target powder spreading area after printing is completed.

[0021] In this example, the safety scanning range represents the range that will not be interfered by the heat of the molten pool; In this example, the infrared detection data represents the data reflected by the heat generated during the melting of the molten pool; In this example, the object to be printed is scanned by a laser scanning device, printed by a laser printing device, and the powder spreading area is spread with powder by a powder spreading device. Generally, the powder spreading device is composed of a powder spreading blade and a robotic arm; In this example, after printing is completed, powder spreading is performed on the corresponding target powder spreading area. After powder spreading on the powder spreading area is completed, printing is performed on this powder spreading area, that is, the powder spreading device first performs powder spreading on the powder spreading area, and then the laser printing device performs printing on the powder spreading area; In this example, each powder spreading area corresponds to a powder spreading layer, that is, the powder thickness at each place in the powder spreading area with qualified powder spreading is the same, and there will be no phenomenon of skipping powder spreading or uneven powder spreading.

[0022] The working principle and beneficial effects of the above technical solution: In order to improve the printing efficiency, it is necessary to increase the powder spreading speed and reduce the printing waiting time. First, to ensure the safety of each device, the infrared monitoring data is processed to determine the safe scanning range of this printing work, and then the object to be printed is scanned within this range. At the same time, according to the powder spreading progress of different powder spreading areas, a suitable powder spreading area is selected for the object to be printed to wait for printing. After the printing work is completed, powder spreading supplement is performed on the powder spreading area. In this way, the progress of the printing work and the powder spreading work can be coordinated and adjusted, and multiple printers can be controlled simultaneously, improving the efficiency of batch printing, reducing the waiting time during printing, and achieving high-quality and high-speed printing work.

[0023] Example 2 Based on Example 1, the laser powder spreading synchronization method based on dynamic collaborative control further includes: Obtain the item specifications of the object to be printed, and determine the printing execution range of the target powder spreading area according to the item specifications; Before printing, move the powder spreading device out of the printing execution range; After printing is completed, identify the powder usage range within the printing execution range, and move the powder spreading device into the powder usage range to wait for powder spreading supplement.

[0024] In this example, the item specifications represent the external specifications of the object to be printed, including its length, width, and height; In this example, the printing execution range represents the range required when performing the printing work.

[0025] The working principle and beneficial effects of the above technical solution: Before printing, first determine the printing execution range according to the item specifications, so as to move the powder spreading device out of the printing execution range before printing, avoiding damage to the powder spreading device. Furthermore, after printing is completed, powder spreading supplement is performed according to the amount of powder used in this printing, improving the powder spreading efficiency of the printer, achieving directional powder spreading, and reducing the waiting time.

[0026] Example 3 Based on Example 1, for the laser powder spreading synchronization method based on dynamic collaborative control, step 1 includes: Step 11: Collect infrared monitoring data within the specified range of the molten pool to determine the working heat transformation characteristics of the molten pool, combine the heat radiation range to determine the interference information of the molten pool on the scanning area, and construct the current safe scanning range of the scanning area; Step 12: Transfer each of the objects to be printed into the current safe scanning range respectively and perform positioning to obtain several positions to be scanned in the scanning area; Step 13: Control the laser scanning device to scan each of the positions to be scanned to obtain the scanning information corresponding to each object to be printed.

[0027] In this example, the specified range of the molten pool represents the range occupied by the size of the molten pool; In this example, the working heat transformation characteristics represent the characteristics presented when the heat generated during the heating process of the molten pool changes; In this example, at different laser scanning speeds of the laser scanning device, the powder spreading blade of the powder spreading device is controlled to perform powder spreading work at different powder spreading speeds, and according to the different printing and scanning areas of the laser scanning device, the powder spreading blade of the powder spreading device preferentially powders the area where the next printing work will be performed.

[0028] The working principle and beneficial effects of the above technical solution: In order to ensure the smooth progress of the printing work and avoid damage to the powder spreading device, the current safe scanning range is determined based on the infrared monitoring data of the molten pool, so as to position and scan the objects to be printed within this range, and obtain the scanning information of the objects to be printed. In this way, both the scanning quality can be guaranteed and the device failures can be reduced.

[0029] Example 4 Based on Example 3, for the laser powder spreading synchronization method based on dynamic collaborative control, Step 13 includes: Step 131: Deduce the range edge transformation information of the current safe scanning range according to the working heat transformation characteristics, determine the current scanning limit edge corresponding to the laser scanning device at the current moment, establish a first distance vector between each position to be scanned and the current scanning limit edge, and establish a second distance vector between different positions to be scanned; Step 132: Combine the second distance vectors according to the principle of the shortest distance to generate the preliminary current scanning path of the laser scanning device, map each of the first distance vectors onto the preliminary current scanning path respectively, screen the target first distance vectors with the scanning direction opposite to that of the preliminary current scanning path and perform path positioning, and use the target first distance vectors to adjust the scanning direction of the preliminary current scanning path; Step 133: When the laser scanning device reaches the path positioning at the current moment, adjust the scanning direction of the laser scanning device, collect the real-time scanning path of the laser scanning device, and when the total real-time length of the path corresponding to the real-time scanning path is consistent with the specified total length of the preliminary current scanning path, determine that the laser scanning device has completed this scan; Step 134: Restore the real-time acquisition information of the laser scanning device on-site according to the real-time scanning path, and divide the restored information according to the position to be scanned corresponding to each object to be printed, so as to obtain the scanning information corresponding to each object to be printed.

[0030] In this example, the range edge transformation information represents the information presented when the range edge of the current safety scanning range changes with the working heat of the molten pool; In this example, the current scanning limit edge represents the edge where the laser scanning device can perform scanning; In this example, the first distance vector represents the distance and direction between the position to be scanned and the current scanning limit edge; In this example, the second distance vector represents the distance and direction between two positions to be scanned; In this example, the preliminary current scanning path represents the path executed when guiding the laser scanning device to perform scanning.

[0031] The working principle and beneficial effects of the above technical solution: In order to ensure the smooth progress of the scanning work and perform a full-range scan of the object to be printed in a short time, first, the range edge transformation information of the current safety scanning range is deduced according to the working heat transformation characteristics, and the current scanning limit edge of the laser scanning device at different moments is determined. Then, a preliminary current scanning path is set for the laser scanning device first, and then the actual scanning path is adjusted according to the actual situation to guide the laser scanning device to perform the scanning work. Finally, the real-time acquisition information of the laser scanning device is restored on-site and the information is divided to obtain the scanning information of each object to be printed. In this way, not only can the intelligence of the scanning work be improved, but also the quality of the scanning work can be guaranteed, and there will be no missed scanning phenomenon, ensuring the integrity of the printed product and realizing intelligent scanning.

[0032] Embodiment 5 On the basis of Embodiment 1, for the laser powder spreading synchronization method based on dynamic collaborative control, Step 2 includes: Step 21: Obtain the historical working data corresponding to each powder spreading area respectively, construct and run the working model corresponding to each powder spreading area to determine the powder spreading progress corresponding to each powder spreading area, and estimate the powder spreading completion moment corresponding to each powder spreading area; Step 22: Set corresponding printing priorities for each of the powder spreading areas according to the sequence of the completion times of powder spreading. Combine the item outlines corresponding to different items to be printed to obtain an outline combination without overlapping outline features. Set a synchronous printing label for the combined printed object corresponding to the outline combination, and set an independent printing label for the remaining objects to be printed; Step 23: Estimate the powder consumption and powder spreading duration corresponding to each printing label respectively. Combine with the powder spreading efficiency of the powder spreading device to sort the printing labels, and generate the item printing sequence for this printing job; Step 24: Use the printing priority to match each printing label with a corresponding target powder spreading area, and generate a printing task to control the laser printing device to perform laser printing.

[0033] In this example, the overlapping outline feature refers to the feature presented when two or more different item outlines overlap; In this example, the synchronous printing label refers to the label set for a group of combined objects to be printed, and the independent printing label refers to the label set for the objects to be printed that need to be printed separately; In this example, the powder consumption is directly proportional to the specification of the finished product. For example, printing a large item requires more powder.

[0034] The working principle and beneficial effects of the above technical solution: By analyzing the historical working data of the powder spreading area to deduce the powder spreading progress of the powder spreading area and determine its powder spreading completion time, and then by combining the item outlines of the objects to be printed to judge whether the objects to be printed can be printed in combination, so as to set relevant printing labels for each object to be printed according to the actual situation. Further, according to the powder consumption, powder spreading duration of each printing label and the powder spreading efficiency of the powder spreading device, sort the printing labels, determine the item printing sequence of this printing job, and match the powder spreading area for each printing label to perform the printing job. In this way, not only can the powder spreading area suitable for the current printing job be selected, but also the objects to be printed with different appearances can be printed simultaneously, improving the printing efficiency, and the printing work can be carried out after the powder spreading is completed, reducing the printing waiting time and ensuring the smoothness of the printing process.

[0035] Embodiment 6 Based on the Embodiment 1, in the laser powder spreading synchronization method based on dynamic cooperative control, Step 3 includes: Step 31: Obtain the real-time printing data corresponding to each target powder spreading area, estimate the printing completion time corresponding to the target powder spreading area, and set a corresponding work schedule for the powder spreading device; Step 32: Collect the real-time powder information corresponding to each target powder spreading area, and determine the powder usage amount when performing printing work in each target powder spreading area; Step 33: Control the powder spreading device to perform powder spreading supplementation on each of the target powder spreading areas according to the work schedule.

[0036] In this example, when controlling the powder spreading device to perform powder spreading supplementation on each of the target powder spreading areas, it is necessary to consider the printing and scanning area of the target powder spreading area, the laser scanning speed, the powder spreading blade speed variable, the layer thickness variable, and the laser power variable; The specific operation is as follows: Determine the range where the powder spreading device needs to perform powder spreading according to the printing and scanning area, adjust the powder spreading blade speed variable of the powder spreading device according to the laser scanning speed, and adjust the powder spreading thickness of the powder spreading device on the target powder spreading area according to the laser power variable, that is, determine the layer thickness variable.

[0037] The working principle and beneficial effects of the above technical solution: Estimate the completion printing time of the target powder spreading area according to the real-time printing data of the target powder spreading area, so as to set a work schedule for the powder spreading device, and determine the powder spreading amount in combination with the real-time powder information of each powder spreading area, thereby guiding the powder spreading device to perform powder spreading work. Since the work schedule is determined in advance, the waiting reaction time of the powder spreading device can be reduced, and powder spreading supplementation can be carried out in time after printing is completed, realizing a closed loop of printing - powder spreading and enabling synchronous cyclic work.

[0038] Embodiment 7 Based on Embodiment 1, the laser powder spreading synchronization method based on dynamic cooperative control further includes: Collect the first real-time working direction of the laser printing device and the second real-time working direction of the powder spreading device; When the first real-time working direction conflicts with the second real-time working direction, adjust the next working direction of the powder spreading device.

[0039] The working principle and beneficial effects of the above technical solution: Further, in order to avoid accidents, when a conflict occurs between the laser printing device and the powder spreading device, the working direction of the powder spreading device is adjusted in time to avoid collision.

[0040] Embodiment 8 Based on Embodiment 3, the laser powder spreading synchronization method based on dynamic cooperative control further includes: Use the infrared monitoring data to construct a working scatter plot of the molten pool, construct several working states when the molten pool performs this printing work, and construct the working heating and melting law of the molten pool; When the error of the working heating and melting law is less than the specified error, perform periodic training on the working heating and melting law to obtain the range transformation law of the current safe scanning range, and construct the preliminary current scanning path of the laser scanning device.

[0041] In this example, the working scatter plot represents the result of expressing the infrared monitoring data in the form of scatter points; In this example, the working heating and melting law represents the law generated during the heating operation of the molten pool.

[0042] The working principle and beneficial effects of the above technical solution: When performing similar printing work for a long time, the melting furnace will operate regularly. Therefore, according to the working heating law, the transformation law of the safety scanning range is determined, and thus the preliminary current scanning path of the laser scanning device is constructed, reducing the previous analysis process, achieving intelligent control, and improving the user's favorable impression.

[0043] Example 9 This example provides a laser powder spreading synchronization system based on dynamic cooperative control, as Figure 2 shown, including: A safety scanning module, used to determine the current safety scanning range according to the infrared monitoring data, and scan the object to be printed in the scanning area within the current safety scanning range; A printing preparation module, used to set the corresponding printing priority for each powder spreading area according to the powder spreading progress corresponding to each powder spreading area, and select the target powder spreading area for the object to be printed for laser printing; A synchronous powder spreading module, used to respectively obtain the powder usage amount corresponding to each target powder spreading area, and perform powder spreading supplementation on the target powder spreading area after printing is completed.

[0044] In this example, the safety scanning range represents the range that will not be interfered by the heat of the molten pool; In this example, the infrared detection data represents the data reflected by the heat generated during the melting of the molten pool; In this example, the object to be printed is scanned by the laser scanning device, the object to be printed is printed by the laser printing device, and the powder spreading area is powder spread by the powder spreading device; In this example, the object to be printed is scanned by the laser scanning device, the object to be printed is printed by the laser printing device, and the powder spreading area is powder spread by the powder spreading device. Generally speaking, the powder spreading device consists of a powder spreading blade and a robotic arm; In this example, after printing is completed, powder spreading work is performed on the corresponding target powder spreading area. After the powder spreading area is completed with powder spreading, printing work is performed in this powder spreading area, that is, the powder spreading device first performs powder spreading work on the powder spreading area, and then the laser printing device performs printing work on the powder spreading area; In this example, each powder spreading area corresponds to a powder spreading layer, that is, the powder thickness at each place in the powder spreading area with qualified powder spreading is the same, and there will be no phenomenon of skipping powder spreading or uneven powder spreading.

[0045] Working principle and beneficial effects of the above technical solution: In order to improve the printing efficiency, both the powder spreading speed and the printing waiting time need to be reduced. First, to ensure the safety of each device, the infrared monitoring data is processed to determine the safe scanning range of the current printing work. Then, within this range, the object to be printed is scanned. At the same time, according to the powder spreading progress of different powder spreading areas, a suitable powder spreading area is selected for the object to be printed to wait for printing. After the printing work is completed, the powder spreading area is replenished with powder. In this way, the progress of the printing work and the powder spreading work can be coordinated and adjusted, and multiple printers can be controlled simultaneously, improving the efficiency of batch printing, reducing the waiting time during printing, and achieving high-quality and high-speed printing work.

[0046] Example 10 Based on the laser powder spreading synchronization system with dynamic collaborative control in Example 9, the safety scanning module includes: Range determination unit, configured to collect infrared monitoring data within the specified range of the molten pool to determine the working heat transformation characteristics of the molten pool, combine the heat radiation range to determine the interference information of the molten pool on the scanning area, and construct the current safe scanning range of the scanning area; Scanning positioning unit, configured to transfer each object to be printed into the current safe scanning range respectively and perform positioning to obtain several positions to be scanned in the scanning area; Scanning execution unit, configured to control the laser scanning device to scan each position to be scanned respectively to obtain the scanning information corresponding to each object to be printed.

[0047] In this example, the specified range of the molten pool represents the range occupied by the size of the molten pool; In this example, the working heat transformation characteristics represent the characteristics presented when the heat generated during the heating process of the molten pool changes.

[0048] Working principle and beneficial effects of the above technical solution: To ensure the smooth progress of the printing work and avoid damage to the powder spreading device, the current safe scanning range is determined according to the infrared monitoring data of the molten pool, so as to position and scan the object to be printed within this range, and obtain the scanning information of the object to be printed. In this way, both the scanning quality can be ensured and the device failure can be reduced.

[0049] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A laser powder bed fusion synchronization method based on dynamic cooperative control, characterized in that Including: Step 1: Determine the current safety scanning range based on the infrared monitoring data, and scan the object to be printed in the scanning area within the current safety scanning range; Step 2: Set the corresponding printing priority for each powder spreading area according to the powder spreading progress corresponding to each powder spreading area, and select a target powder spreading area for the object to be printed for laser printing; Step 3: Obtain the powder usage amount corresponding to each target powder spreading area respectively, and perform powder replenishment on the target powder spreading area after printing is completed.

2. The laser powder spreading synchronization method based on dynamic cooperative control according to claim 1, wherein Also including: Obtain the item specifications of the object to be printed, and determine the printing execution range of the target powder spreading area according to the item specifications; Before printing, move the powder spreading device out of the printing execution range; After printing is completed, identify the powder usage range within the printing execution range, and move the powder spreading device into the powder usage range to wait for powder replenishment.

3. The laser powder feeding synchronization method based on dynamic cooperative control according to claim 1, characterized in that, The said Step 1 includes: Step 11: Collect the infrared monitoring data within the specified range of the molten pool to determine the working heat transformation characteristics of the molten pool, combine the heat radiation range to determine the interference information of the molten pool on the scanning area, and construct the current safety scanning range of the scanning area; Step 12: Transmit each object to be printed into the current safety scanning range respectively and perform positioning to obtain several positions to be scanned in the scanning area; Step 13: Control the laser scanning device to scan each position to be scanned respectively to obtain the scanning information corresponding to each object to be printed.

4. The laser powder spreading synchronization method based on dynamic cooperative control according to claim 3, characterized in that The said Step 13 includes: Step 131: Deduce the range edge transformation information of the current safety scanning range according to the working heat transformation characteristics, determine the current scanning limit edge corresponding to the laser scanning device at the current moment, establish the first distance vector between each position to be scanned and the current scanning limit edge, and establish the second distance vector between different positions to be scanned; Step 132: Combine the second distance vectors according to the principle of the shortest distance to generate the preliminary current scanning path of the laser scanning device, map each first distance vector onto the preliminary current scanning path respectively, screen the target first distance vectors with the scanning direction opposite to the preliminary current scanning path and perform path positioning, and use the target first distance vectors to adjust the scanning direction of the preliminary current scanning path; Step 133: If the laser scanning device reaches the path positioning at the current moment, adjust the scanning direction of the laser scanning device, collect the real-time scanning path of the laser scanning device, and when the real-time total length of the path corresponding to the real-time scanning path is consistent with the specified total length of the preliminary current scanning path, determine that the laser scanning device has completed this scan; Step 134: Restore the real-time acquisition information of the laser scanning device on-site according to the real-time scanning path, and divide the restored information according to the positions to be scanned corresponding to each object to be printed to obtain the scanning information corresponding to each object to be printed.

5. The laser powder spreading synchronization method based on dynamic cooperative control according to claim 1, characterized in that The said Step 2 includes: Step 21: Obtain the historical working data corresponding to each powder spreading area respectively, construct and run the working model corresponding to each powder spreading area to determine the powder spreading progress corresponding to each powder spreading area, and estimate the powder spreading completion time corresponding to each powder spreading area; Step 22: Set the corresponding printing priority for each powder spreading area according to the sequence of the powder spreading completion times, combine the item outlines corresponding to different objects to be printed, obtain an outline combination without overlapping contour features, set a synchronous printing label for the combined printed object corresponding to the outline combination, and set an independent printing label for the remaining objects to be printed; Step 23: Estimate the powder consumption and powder spreading duration corresponding to each printing label respectively, sort the printing labels in combination with the powder spreading efficiency of the powder spreading device, and generate the item printing order for this printing work; Step 24: Use the printing priority to match each printing label with the corresponding target powder spreading area, generate a printing task to control the laser printing device to perform laser printing.

6. The laser powder spreading synchronization method based on dynamic cooperative control according to claim 1, characterized in that The said Step 3 includes: Step 31: Obtain the real-time printing data corresponding to each target powder spreading area, estimate the printing completion time corresponding to the target powder spreading area, and set a corresponding working schedule for the powder spreading device; Step 32: Collect the real-time powder information corresponding to each target powder spreading area, and determine the powder usage amount when performing printing work in each target powder spreading area; Step 33: Control the powder spreading device to perform powder spreading replenishment for each target powder spreading area according to the working schedule.

7. The laser powder spreading synchronization method based on dynamic cooperative control according to claim 1, wherein, It further includes: Collect the first real-time working direction of the laser printing device and the second real-time working direction of the powder spreading device; When the first real-time working direction conflicts with the second real-time working direction, adjust the next working direction of the powder spreading device.

8. The laser powder spreading synchronization method based on dynamic cooperative control according to claim 3, characterized in that It further includes: Construct a working scatter plot of the molten pool using the infrared monitoring data, construct several working states when the molten pool performs this printing work, and construct the working heating and melting law of the molten pool; When the error of the working heating and melting law is less than the specified error, perform periodic training on the working heating and melting law to obtain the range transformation law of the current safety scanning range for this time, and construct the preliminary current scanning path of the laser scanning device.

9. Laser powder spreading synchronization system based on dynamic collaborative control, characterized in that It includes: A safety scanning module, which is used to determine the current safety scanning range according to the infrared monitoring data, and scan the object to be printed in the scanning area within the current safety scanning range; A printing preparation module, which is used to set the corresponding printing priority for the corresponding powder spreading area according to the powder spreading progress corresponding to each powder spreading area, and select a target powder spreading area for the object to be printed to perform laser printing; A synchronous powder spreading module, which is used to obtain the powder usage amount corresponding to each target powder spreading area respectively, and perform powder spreading replenishment on the target powder spreading area after printing is completed.

10. The laser powder spreading synchronization system based on dynamic cooperative control according to claim 9, characterized in that, The said safety scanning module includes: A range determination unit, which is used to collect the infrared monitoring data within the specified range of the molten pool to determine the working heat transformation characteristics of the molten pool, combine the heat radiation range to determine the interference information of the molten pool on the scanning area, and construct the current safety scanning range of the scanning area; A scanning and positioning unit is configured to separately transfer each of the objects to be printed into the current security scanning range for separate positioning, so as to obtain a plurality of positions to be scanned in the scanning area. A scanning execution unit is configured to control a laser scanning device to scan each of the positions to be scanned, so as to obtain scanning information corresponding to each of the objects to be printed.

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