Multi-pulse laser beam surface area printing method

Abstract

The invention discloses a multi-pulse laser beam surface area printing method. The method comprises the steps that a three-dimensional model of a to-be-printed part is obtained; according to the three-dimensional model of the to-be-printed part, the specification type of the to-be-printed part is obtained; slicing and processing the three-dimensional model of the to-be-printed part according to the specification type of the to-be-printed part to obtain a printing path of each slicing layer of the to-be-printed part; and the multi-pulse laser beam surface area printing device is used for printing layer by layer according to the printing path of each slice layer of the to-be-printed part. Energy input of the pulse laser at each time is accurately adjusted, so that excessive heat accumulation is avoided, thermal deformation and overlarge molten pool are reduced, and the size precision and the surface quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a multi-pulse laser beam surface area printing method. Background Art

[0002] Laser selective melting technology is widely used in the field of micron-scale structure manufacturing. Among them, the choice of laser light source affects the manufacturing quality of nano-scale structures. Because too much heat input will not only cause excessive melting of the material, but also may cause dimensional deviation and surface roughness problems. Although traditional continuous laser light sources are stable in conventional applications, they often face problems such as large heat-affected zones, difficult to control dimensional accuracy, thermal stress and deformation in microstructure manufacturing, and cannot meet the manufacturing needs of high-precision micron structures. Summary of the invention

[0003] In order to solve the technical problems existing in the background technology, the present invention proposes a multi-pulse laser beam surface area printing method.

[0004] A multi-pulse laser beam surface area printing method proposed in the present invention is applied to a multi-pulse laser beam surface area printing device, the multi-pulse laser beam surface area printing device comprising: a multi-pulse laser output mechanism and a molding mechanism, the molding surface of the molding substrate of the molding mechanism has an area of ​​300×300 mm;

[0005] The multi-pulse laser output mechanism includes 6 pulse laser output units. The scanning galvanometers of the 6 pulse laser output units are arranged in 3×2 rows and columns. The distance between any two adjacent rows is 100 mm, and the distance between adjacent columns is 150 mm. The coverage area of ​​each scanning galvanometer is 300 mm×300 mm.

[0006] Among them, the pulse laser output units corresponding to the two scanning galvanometers in the second row in the vertical direction are multi-mode pulse laser output units, which are used to output flat-top pulse lasers or Gaussian pulse lasers, and the remaining four pulse laser output units are Gaussian pulse laser units;

[0007] The printing method comprises:

[0008] Obtain a three-dimensional model of the part to be printed;

[0009] According to the three-dimensional model of the part to be printed, the specification type of the part to be printed is obtained;

[0010] Slicing and processing the three-dimensional model of the part to be printed according to the specification type of the part to be printed, and obtaining the printing path of each slice layer of the part to be printed;

[0011] A multi-pulse laser beam surface area printing device is used to perform layer-by-layer printing according to the printing path of each slice layer of the part to be printed.

[0012] Preferably, the specification type of the part to be printed includes small size, and the size of the small size is less than 150mm×100mm.

[0013] Preferably, the three-dimensional model of the part to be printed is sliced ​​and processed according to the specification type of the part to be printed to obtain the printing path of each slice layer of the part to be printed, which specifically includes:

[0014] When the specification type of the part to be printed is small, the molding surface of the imaging substrate is divided into 6 first areas arranged in 3×2 rows and columns along its length direction and width direction; wherein each first area is used to print a corresponding part to be printed;

[0015] Slice the 3D model of the part to be printed layer by layer to obtain the outline of each slice layer;

[0016] Gaussian pulse laser is used to fill the outline of each slice layer to obtain the printing path of each slice layer of the part to be printed.

[0017] Preferably, the multi-pulse laser beam surface area printing device is used to perform layer-by-layer printing according to the printing path of each slice layer of the part to be printed, specifically including:

[0018] Six pulse laser output units are used to output six Gaussian pulse lasers respectively, so that the six Gaussian pulse lasers are printed layer by layer in the six first areas respectively according to the printing paths of the slice layers of the part to be printed.

[0019] Preferably, the specification types of the parts to be printed include medium-sized ones, and the size of the medium-sized ones is greater than or equal to 150 mm×100 mm and less than 150 mm×300 mm.

[0020] Preferably, the three-dimensional model of the part to be printed is sliced ​​and processed according to the specification type of the part to be printed to obtain the printing path of each slice layer of the part to be printed, which specifically includes:

[0021] When the specification type of the part to be printed is medium, the molding surface of the imaging substrate is divided into eight second areas arranged in 2×4 rows and columns along its length direction and width direction;

[0022] The four second areas located in the second column and the third column are combined to form a pre-printing area; wherein the pre-printing area is used to print a corresponding part to be printed, and the outline of each slice layer is simultaneously distributed in the four second areas in the pre-printing area;

[0023] Slice the 3D model of the part to be printed layer by layer to obtain multiple slice layers and the outline of each slice layer;

[0024] Two multi-mode pulse lasers are combined to output a double flat-top pulse laser of a predetermined shape to fill and print the contour of each slice layer, and four Gaussian pulse laser units are used to print the remaining area of ​​the contour in each second area in the pre-printing area, respectively, to obtain the printing path of each slice layer of the printed part.

[0025] Preferably, the double flat-top pulse laser of predetermined shape is a pulse laser spot of ∞ shape.

[0026] Preferably, during the printing process of each layer, two multi-mode pulse lasers are combined to output a double flat-top pulse laser of a predetermined shape to fill and print the contour in the pre-printed area, and four Gaussian pulse laser units are used to print the remaining areas of the contour in each second area in the pre-printed area.

[0027] Preferably, the specification type of the part to be printed includes large size, and the size of the large size is greater than or equal to 150mm×300mm and less than 300mm×300mm.

[0028] Preferably, the three-dimensional model of the part to be printed is sliced ​​and processed according to the specification type of the part to be printed to obtain the printing path of each slice layer of the part to be printed, which specifically includes:

[0029] When the specification type of the part to be printed is large, the molding surface of the imaging substrate is divided into four third areas arranged in 2×2 rows and columns along its length direction and width direction;

[0030] The three-dimensional model of the part to be printed is sliced ​​layer by layer to obtain the contour of each slice layer; wherein the molding surface is used to print a corresponding part to be printed, and the contour of each slice layer is distributed in the four third areas at the same time;

[0031] Using the flat-top pulse laser output unit located in the first column to output the flat-top pulse laser to fill the contours of the two third areas located in the first column, and using the flat-top pulse laser output unit located in the second column to output the flat-top laser to fill and print the contours of the two third areas located in the second column;

[0032] Then, the Gaussian pulse laser output unit located in the first row and the first column is used to output Gaussian pulse laser to print the remaining part of the contour of the third area located in the first row and the first column; at the same time, the Gaussian pulse laser output unit located in the first row and the second column is used to output Gaussian pulse laser to print the remaining part of the contour of the third area located in the first row and the second column; at the same time, the Gaussian pulse laser output unit located in the second row and the first column is used to output Gaussian pulse laser to print the remaining part of the contour of the third area located in the second row and the first column; at the same time, the Gaussian pulse laser output unit located in the second row and the second column is used to output Gaussian pulse laser to print the remaining part of the contour of the third area located in the second row and the second column, thereby obtaining the printing path of each slice layer of each third area;

[0033] The printing paths of each slice layer of each third area are combined to form the printing paths of each slice layer of the part to be printed.

[0034] In the present invention, a multi-pulse laser beam surface area printing method is proposed, which first obtains the specification type of the part to be printed according to the three-dimensional model of the part to be printed, slices and processes the three-dimensional model of the part to be printed according to the specification type of the part to be printed, and obtains the printing path of each slice layer of the part to be printed; and uses a multi-pulse laser beam surface area printing device to perform printing layer by layer according to the printing path of each slice layer of the part to be printed.

[0035] The present invention outputs pulsed lasers through a multi-pulse laser beam surface area printing device, and can accurately adjust each energy input of the pulsed laser by controlling the pulse duration and peak power, thereby avoiding excessive heat accumulation, reducing thermal deformation and excessive molten pool, and thus improving dimensional accuracy and surface quality. During the printing process, the Gaussian beam can accurately melt small areas, while the flat-top beam ensures that the energy is evenly distributed in a larger area, avoiding overheating, reducing the heat-affected zone, and thus optimizing the surface quality and structural accuracy. The present invention can achieve the synergistic effect of the flat-top pulse laser and the Gaussian pulse laser through a multi-pulse laser output mechanism, so that additive manufacturing can not only achieve high-precision micron-level structures, but also improve surface finish and ensure the overall quality of parts. In addition, the setting of the multi-pulse laser output mechanism can also process multiple areas at the same time, effectively improving the efficiency of additive manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the arrangement of the scanning galvanometer of the multi-pulse laser output mechanism in one embodiment of the present invention.

[0037] Figure 2 This is a schematic structural diagram of a part to be printed in an embodiment of the present invention.

[0038] Figure 3A schematic diagram of the irradiation range of the laser output by the multi-pulse laser output mechanism in one embodiment of the present invention.

[0039] Figure 4 It is a schematic diagram of the irradiation range of the laser output by the multi-pulse laser output mechanism in another embodiment of the present invention.

[0040] Figure 5 This is a schematic diagram of the irradiation range of the laser output by the multi-pulse laser output mechanism in another embodiment of the present invention.

[0041] Figure 6 This is a schematic diagram of printing on a certain slice layer by a multi-pulse laser output mechanism in one embodiment of the present invention.

[0042] Figure 7 This is a schematic diagram of printing on a certain slice layer by a multi-pulse laser output mechanism in another embodiment of the present invention.

[0043] Figure 8 This is a schematic diagram of printing on a certain slice layer by a multi-pulse laser output mechanism in another embodiment of the present invention. DETAILED DESCRIPTION

[0044] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] A multi-pulse laser beam surface area printing method proposed in the present invention is applied to a multi-pulse laser beam surface area printing device, the multi-pulse laser beam surface area printing device comprising: a multi-pulse laser output mechanism and a molding mechanism, the molding surface of the molding substrate of the molding mechanism has an area of ​​300×300 mm;

[0046] The multi-pulse laser output mechanism includes 6 pulse laser output units, and the scanning galvanometers of the 6 pulse laser output units are arranged in 3×2 rows and columns. Figure 1 As shown; the distance between any two adjacent rows is 100 mm, the distance between adjacent columns is 150 mm, and the coverage area of ​​each scanning galvanometer is 300 mm × 300 mm;

[0047] Among them, the pulse laser output units corresponding to the two scanning galvanometers in the second row in the vertical direction are multi-mode pulse laser output units, which are used to output flat-top pulse lasers or Gaussian pulse lasers, and the remaining four pulse laser output units are Gaussian pulse laser units;

[0048] The printing method comprises:

[0049] Obtain a three-dimensional model of the part to be printed;

[0050] According to the three-dimensional model of the part to be printed, the specification type of the part to be printed is obtained;

[0051] Slicing and processing the three-dimensional model of the part to be printed according to the specification type of the part to be printed, and obtaining the printing path of each slice layer of the part to be printed;

[0052] A multi-pulse laser beam surface area printing device is used to perform layer-by-layer printing according to the printing path of each slice layer of the part to be printed.

[0053] The present invention first obtains the specification type of the part to be printed according to the three-dimensional model of the part to be printed, slices and processes the three-dimensional model of the part to be printed according to the specification type of the part to be printed, and obtains the printing path of each slice layer of the part to be printed; and uses a multi-pulse laser beam surface area printing device to print layer by layer according to the printing path of each slice layer of the part to be printed. The present invention outputs pulsed lasers through a multi-pulse laser beam surface area printing device, and can accurately adjust the energy input of each pulsed laser by controlling the pulse duration and peak power, thereby avoiding excessive heat accumulation, reducing thermal deformation and excessive molten pool, and thus improving dimensional accuracy and surface quality.

[0054] During the printing process, the Gaussian beam can accurately melt a small area, while the flat-top beam ensures that the energy is evenly distributed in a larger area, avoiding overheating and reducing the heat-affected zone, thereby optimizing the surface quality and structural accuracy. The present invention can achieve the synergistic effect of the flat-top pulse laser and the Gaussian pulse laser through a multi-pulse laser output mechanism, so that additive manufacturing can not only achieve high-precision micron-level structures, but also improve surface finish and ensure the overall quality of parts.

[0055] In addition, the setting of the multi-pulse laser output mechanism can also process multiple areas at the same time, effectively improving the efficiency of additive manufacturing.

[0056] Among them, the specifications of the parts to be printed include small.

[0057] Among them, when the size of the part to be printed is less than 150mm×100mm, the specification type of the part to be printed is small.

[0058] Among them, the three-dimensional model of the part to be printed is sliced ​​and processed according to the specification type of the part to be printed, and the printing path of each slice layer of the part to be printed is obtained, which specifically includes:

[0059] When the specification type of the part to be printed is small, the molding surface of the imaging substrate is divided into 6 first areas arranged in 3×2 rows and columns along its length direction and width direction; wherein each first area is used to print a corresponding part to be printed;

[0060] Slice the 3D model of the part to be printed layer by layer to obtain the outline of each slice layer;

[0061] Gaussian pulse laser is used to fill the outline of each slice layer to obtain the printing path of each slice layer of the part to be printed.

[0062] The area of ​​each first region is 100 mm×150 mm.

[0063] In a further embodiment, a multi-pulse laser beam surface area printing device is used to perform layer-by-layer printing according to the printing path of each slice layer of the part to be printed, specifically including:

[0064] Six pulse laser output units are used to output six Gaussian pulse lasers respectively, so that the six Gaussian pulse lasers are printed layer by layer in the six first areas respectively according to the printing paths of the slice layers of the part to be printed.

[0065] Among them, the specifications of the parts to be printed include medium size.

[0066] Among them, when the size of the part to be printed is greater than or equal to 150mm×100mm and less than 150mm×300mm, the specification type of the part to be printed is medium.

[0067] Among them, the three-dimensional model of the part to be printed is sliced ​​and processed according to the specification type of the part to be printed, and the printing path of each slice layer of the part to be printed is obtained, which specifically includes:

[0068] When the specification type of the part to be printed is medium, the molding surface of the imaging substrate is divided into 8 second areas arranged in 2×4 rows and columns along its length direction and width direction;

[0069] The four second areas located in the second column and the third column are combined to form a pre-printing area; wherein the pre-printing area is used to print a corresponding part to be printed, and the outline of each slice layer is simultaneously distributed in the four second areas in the pre-printing area;

[0070] Slice the 3D model of the part to be printed layer by layer to obtain the outline of each slice layer;

[0071] Two multi-mode pulse lasers are combined to output a double flat-top pulse laser of a predetermined shape to fill and print the contour of each slice layer, and four Gaussian pulse laser units are used to print the remaining area of ​​the contour in each second area in the pre-printing area, respectively, to obtain the printing path of each slice layer of the part to be printed.

[0072] The area of ​​each second region is 150 mm×75 mm.

[0073] Specifically, the predetermined shape of the double flat-top pulse laser is an ∞-shaped pulse laser spot. The pre-printing area is the overlapping area of ​​the coverage area of ​​the scanning galvanometers of the two multi-mode pulse laser output units, and the area of ​​the overlapping area is 300×150 mm, which is the working area of ​​the double flat-top pulse laser.

[0074] In this embodiment, two multi-mode pulse lasers are combined to output a double flat-top pulse laser of a predetermined shape to fill and print the contour of each slice layer in the pre-printed area, which is equivalent to a new light spot of a predetermined shape performing pulse printing. There is no overlapping boundary of double light irradiation, which reduces the overlapping area of ​​double flat-top light irradiation, reduces the temperature gradient, and reduces stress. Moreover, the double flat-top pulse laser of the predetermined shape has a large light spot, which increases the working area of ​​a single laser printing and improves the overall manufacturing efficiency. Then, four Gaussian pulse laser units are used to print the remaining area of ​​the contour at the same time, which greatly improves the overall manufacturing efficiency.

[0075] In a further embodiment, a multi-pulse laser beam surface area printing device is used to perform layer-by-layer printing according to the printing path of each slice layer of the part to be printed, specifically including:

[0076] During the printing process of each layer, two multi-mode pulse lasers are combined to output a double flat-top pulse laser of a predetermined shape to fill and print the contour in the pre-printing area, and four Gaussian pulse laser units are used to print the remaining areas of the contour in each second area in the pre-printing area.

[0077] Among them, the specification type of the part to be printed includes large size. When the size of the part to be printed is greater than or equal to 150 mm×300 mm and less than 300 mm×300 mm, the specification type of the part to be printed is large size.

[0078] Among them, the three-dimensional model of the part to be printed is sliced ​​and processed according to the specification type of the part to be printed, and the printing path of each slice layer of the part to be printed is obtained, which specifically includes:

[0079] When the specification type of the part to be printed is large, the molding surface of the imaging substrate is divided into four third areas arranged in 2X2 rows and columns along its length direction and width direction; wherein the molding surface is used to print a corresponding part to be printed, and the contour of each slice layer is distributed in the four third areas at the same time;

[0080] Slice the 3D model of the part to be printed layer by layer to obtain the outline of each slice layer;

[0081] The flat-top pulse laser output unit located in the first column is used to output a flat-top pulse laser to fill the contours of the two third areas located in the first column, and the flat-top pulse laser output unit located in the second column is used to output a flat-top laser to fill and print the contours of the two third areas located in the second column; then, the Gaussian pulse laser output unit located in the first row and the first column is used to output a Gaussian pulse laser to print the remaining part of the contour of the third area located in the first row and the first column; at the same time, the Gaussian pulse laser output unit located in the first row and the second column is used to output a Gaussian pulse laser to print the remaining part of the contour of the third area located in the first row and the second column; at the same time, the Gaussian pulse laser output unit located in the second row and the first column is used to output a Gaussian pulse laser to print the remaining part of the contour of the third area located in the second row and the first column; at the same time, the Gaussian pulse laser output unit located in the second row and the second column is used to output a Gaussian pulse laser to print the remaining part of the contour of the third area located in the second row and the second column, thereby obtaining the printing path of each slice layer of the part to be printed.

[0082] This embodiment first uses two flat-top pulse lasers to perform filling printing at the same time, and then uses four Gaussian pulse lasers to perform filling printing at the same time, which can effectively improve the efficiency of additive manufacturing.

[0083] Therefore, in the printing process of each layer, first, the flat-top pulse laser output unit located in the first column is used to output a flat-top pulse laser to fill the contours of the two third areas located in the first column, and at the same time, the flat-top pulse laser output unit located in the second column is used to output a flat-top laser to fill and print the contours of the two third areas located in the second column; then, the Gaussian pulse laser output unit located in the first row and the first column is used to output a Gaussian pulse laser to print the remaining part of the contour of the third area located in the first row and the first column; at the same time, the Gaussian pulse laser output unit located in the first row and the second column is used to output a Gaussian pulse laser to print the remaining part of the contour of the third area located in the first row and the second column; at the same time, the Gaussian pulse laser output unit located in the second row and the first column is used to output a Gaussian pulse laser to print the remaining part of the contour of the third area located in the second row and the first column; at the same time, the Gaussian pulse laser output unit located in the second row and the second column is used to output a Gaussian pulse laser to print the remaining part of the contour of the third area located in the second row and the second column.

[0084] In one specific embodiment, the part to be printed is a spur gear, such as Figure 2 shown.

[0085] When the specification type of the spur gear is small, the coverage range of the Gaussian pulse laser output by the multi-pulse laser output mechanism is as follows Figure 3 The schematic diagram of the printing of a certain slice layer by a multi-pulse laser output mechanism is shown in Figure 6 As shown. Among them, Figure 3 and Figure 5 The Gaussian beams in the figure are all Gaussian pulse lasers.

[0086] When the specification type of the spur gear is medium, the coverage of the predetermined shape of the double flat-top pulse laser output by the multi-pulse laser output mechanism is as follows: Figure 4 As shown. Among them, Figure 4 The flat top light in the image is a double flat top pulse laser with a predetermined shape. The schematic diagram of the printing of a certain slice layer by a multi-pulse laser output mechanism is shown in the figure. Figure 7 shown.

[0087] When the specification type of the spur gear is large, the range of the flat-top pulse laser and Gaussian pulse laser output by the multi-pulse laser output mechanism is as follows: Figure 5 The schematic diagram of the printing of a certain slice layer by a multi-pulse laser output mechanism is shown in Figure 8 shown.

[0088] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-pulse laser beam surface area printing method, applied to a multi-pulse laser beam surface area printing device, characterized in that: The multi-pulse laser beam surface area printing device comprises: a multi-pulse laser output mechanism and a molding mechanism, wherein the molding surface of the molding substrate of the molding mechanism has an area of ​​300 mm×300 mm; The multi-pulse laser output mechanism includes 6 pulse laser output units. The scanning galvanometers of the 6 pulse laser output units are arranged in 3×2 rows and columns. The distance between any two adjacent rows is 100 mm, and the distance between adjacent columns is 150 mm. The coverage area of ​​each scanning galvanometer is 300 mm×300 mm. Among them, the pulse laser output units corresponding to the two scanning galvanometers in the second row in the vertical direction are multi-mode pulse laser output units, which are used to output flat-top pulse lasers or Gaussian pulse lasers, and the remaining four pulse laser output units are Gaussian pulse laser units; The printing method comprises: Obtain a three-dimensional model of the part to be printed; According to the three-dimensional model of the part to be printed, the specification type of the part to be printed is obtained; Slicing and processing the three-dimensional model of the part to be printed according to the specification type of the part to be printed, and obtaining the printing path of each slice layer of the part to be printed; A multi-pulse laser beam surface area printing device is used to perform layer-by-layer printing according to the printing path of each slice layer of the part to be printed.

2. The multi-pulse laser beam surface area printing method according to claim 1, characterized in that: The specifications of the parts to be printed include small, with the size of the small being less than 150mm×100mm.

3. The multi-pulse laser beam surface area printing method according to claim 2, characterized in that: The 3D model of the part to be printed is sliced ​​and processed according to the specification type of the part to be printed, and the printing path of each slice layer of the part to be printed is obtained, which specifically includes: When the specification type of the part to be printed is small, the molding surface of the imaging substrate is divided into 6 first areas arranged in 3×2 rows and columns along its length direction and width direction; wherein each first area is used to print a corresponding part to be printed; Slice the 3D model of the part to be printed layer by layer to obtain the outline of each slice layer; Gaussian pulse laser is used to fill the outline of each slice layer to obtain the printing path of each slice layer of the part to be printed.

4. The multi-pulse laser beam surface area printing method according to claim 3, characterized in that: The multi-pulse laser beam surface area printing device is used to print layer by layer according to the printing path of each slice layer of the part to be printed, specifically including: Six pulse laser output units are used to output six Gaussian pulse lasers respectively, so that the six Gaussian pulse lasers are printed layer by layer in the six first areas respectively according to the printing paths of the slice layers of the part to be printed.

5. The multi-pulse laser beam surface area printing method according to claim 1, characterized in that: The specifications of the parts to be printed include medium-sized ones, the size of which is greater than or equal to 150 mm × 100 mm and less than 150 mm × 300 mm.

6. The multi-pulse laser beam surface area printing method according to claim 5, characterized in that: The 3D model of the part to be printed is sliced ​​and processed according to the specification type of the part to be printed, and the printing path of each slice layer of the part to be printed is obtained, which specifically includes: When the specification type of the part to be printed is medium, the molding surface of the imaging substrate is divided into eight second areas arranged in 2×4 rows and columns along its length direction and width direction; The four second areas located in the second column and the third column are combined to form a pre-printing area; wherein the pre-printing area is used to print a corresponding part to be printed, and the contour of each slice layer is simultaneously distributed in the four second areas in the pre-printing area; Slice the 3D model of the part to be printed layer by layer to obtain multiple slice layers and the outline of each slice layer; Two multi-mode pulse lasers are combined to output a double flat-top pulse laser of a predetermined shape to fill and print the contour of each slice layer, and four Gaussian pulse laser units are used to print the remaining area of ​​the contour in each second area in the pre-printing area, respectively, to obtain the printing path of each slice layer of the printed part.

7. The multi-pulse laser beam surface area printing method according to claim 6, characterized in that: The double flat-top pulse laser of predetermined shape is an ∞-shaped pulse laser spot.

8. The multi-pulse laser beam surface area printing method according to claim 6, characterized in that: During the printing process of each layer, two multi-mode pulse lasers are combined to output a double flat-top pulse laser of a predetermined shape to fill and print the contour in the pre-printing area, and four Gaussian pulse laser units are used to print the remaining areas of the contour in each second area in the pre-printing area.

9. The multi-pulse laser beam surface area printing method according to claim 1, characterized in that: The specification types of the parts to be printed include large, and the size of the large is greater than or equal to 150mm×300mm and less than 300mm×300mm.

10. The multi-pulse laser beam surface area printing method according to claim 8, characterized in that: The 3D model of the part to be printed is sliced ​​and processed according to the specification type of the part to be printed, and the printing path of each slice layer of the part to be printed is obtained, which specifically includes: When the specification type of the part to be printed is large, the molding surface of the imaging substrate is divided into four third areas arranged in 2×2 rows and columns along its length direction and width direction; The three-dimensional model of the part to be printed is sliced ​​layer by layer to obtain the contour of each slice layer; wherein the molding surface is used to print a corresponding part to be printed, and the contour of each slice layer is distributed in four third areas at the same time; Using the flat-top pulse laser output unit located in the first column to output the flat-top pulse laser to fill the contours of the two third areas located in the first column, and using the flat-top pulse laser output unit located in the second column to output the flat-top laser to fill and print the contours of the two third areas located in the second column; Then, the Gaussian pulse laser output unit located in the first row and the first column is used to output Gaussian pulse laser to print the remaining part of the contour of the third area located in the first row and the first column; at the same time, the Gaussian pulse laser output unit located in the first row and the second column is used to output Gaussian pulse laser to print the remaining part of the contour of the third area located in the first row and the second column; at the same time, the Gaussian pulse laser output unit located in the second row and the first column is used to output Gaussian pulse laser to print the remaining part of the contour of the third area located in the second row and the first column; at the same time, the Gaussian pulse laser output unit located in the second row and the second column is used to output Gaussian pulse laser to print the remaining part of the contour of the third area located in the second row and the second column, thereby obtaining the printing path of each slice layer of each third area; The printing paths of each slice layer of each third area are combined to form the printing paths of each slice layer of the part to be printed.

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