CN112517931A

CN112517931A - Metal 3D printing composite processing method and device thereof

Info

Publication number: CN112517931A
Application number: CN202011576589.1A
Authority: CN
Inventors: 卢昶帅
Original assignee: Nanjing Feijie Robot Co ltd
Current assignee: Nanjing Feijie Robot Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-03-19

Abstract

The invention relates to the technical field of metal 3D printing, and discloses a metal 3D printing composite processing method and a device thereof, wherein the method comprises the following steps: laying metal powder on the platform and the metal bottom plate; scraping the metal powder on the platform and the metal bottom plate by using a scraper; in the laser area, sintering metal powder into a structural layer in a preset shape; reducing the height of the metal bottom plate relative to the platform, wherein the height value is the thickness of a structural layer; scanning the sintered product by the image recognition component; comparing the structural data formed by scanning the product to be processed with preset product data, and cutting and finishing the product to be processed; repeating the steps to obtain a molded product; snatch metal soleplate and fashioned product to the machining station beside the platform, have milling cutter on the machining station and carry out finish machining on the degree of depth size to the product according to predetermined degree of depth processing data, until the finish machining of product is accomplished.

Description

Metal 3D printing composite processing method and device thereof

Technical Field

The invention relates to the technical field of metal 3D printing, in particular to a metal 3D printing composite processing method and a device thereof.

Background

The metal 3D printing equipment is used for molding and printing metal powder by laser to manufacture various metal parts without die sinking or designing a plurality of machining steps, and is widely applied to the field of manufacturing of special-shaped parts and complex parts.

In the injection molding die-casting industry, some templates and some new products are printed in small batches, and if the templates and the new products are manufactured by using die steel, the time consumption and the cost are high, but in order to mass-produce the products corresponding to the templates and the new products in the later period, the die steel has to be used for manufacturing the templates and the new products in small batches generally.

In view of the above-mentioned related technologies, a process and an apparatus for rapidly manufacturing templates or new products in small batches are needed.

Disclosure of Invention

In view of the related technical problems, an object of the present invention is to provide a metal 3D printing composite processing method, which has the advantage of being able to quickly manufacture templates or new products in small batches. The invention also aims to provide a metal 3D printing composite processing device which has the advantage of being capable of quickly manufacturing templates or new products in small batches.

In order to achieve the first purpose, the invention provides the following technical scheme:

a metal 3D printing composite processing method is based on a platform, a metal bottom plate and a milling cutter, wherein the metal bottom plate is located in the middle of the platform and used for lifting and bearing a printed product, the milling cutter is located corresponding to the printed product, a manipulator and an image recognition assembly used for scanning a printed structure are arranged beside the platform, and the method comprises the following steps:

s1: laying metal powder on the platform and the metal bottom plate;

s2: using a scraper to scrape metal powder on the platform and the metal bottom plate;

s3: in the laser area, one or more laser lasers are used for irradiating metal powder according to a preset at least two-dimensional path, so that the metal powder is sintered to form a structural layer in a preset shape;

s4: reducing the height of the metal bottom plate relative to the platform, wherein the height value is the thickness of one structural layer;

s5: the image recognition component scans the sintered product;

s6: comparing the structural data formed by scanning the product to be processed with preset product data to obtain processing data of the product to be processed, and cutting and finishing the product to be processed according to the processing data;

s7: repeating the step S1 to the step S6 to obtain a molded product; and grabbing the metal bottom plate and the formed product to a machining station beside the platform by using a manipulator, wherein the machining station is provided with a milling cutter and performs finish machining on the product in depth dimension according to preset depth machining data until finish machining of the product is completed.

By adopting the technical scheme, the method is used for producing the 3D printed product with the precise appearance, the special-shaped water path required by the injection molding die-casting die is conveniently formed in the 3D printed product, the die with the special-shaped water path can be cooled more reasonably, the quality of the product obtained by injection molding and die-casting can be better, the cost of the 3D special-shaped water path used on the die is low, and the cooling efficiency is improved by more than 30%; meanwhile, the exhaust effect is achieved by utilizing the characteristic that metal powder is particles to form a die and parts, and the exhaust effect is different from that of common die steel, and any local position can be selected as the exhaust position.

The present invention further provides that, in step S6, the method further includes:

the milling cutter and the structural layer to be cut and trimmed or cut and trimmed keep the relative height position difference smaller than a set range;

and after the structural layer is cut and trimmed, the milling cutter moves to a position corresponding to the next structural layer.

Through adopting above-mentioned technical scheme, the structural layer is at the in-process that constantly forms, and the upper and lower position of milling cutter is adjusted according to the height of structural layer or product, prints one deck processing one deck, perhaps under the condition that milling cutter position and radium-shine laser head position do not conflict, and the milling cutter processing has printed the structural layer, and radium-shine laser head prints the one deck that next needs to print, realizes printing while processing, also does benefit to simultaneously and reduces the process time between processing and printing influence each other.

The present invention further provides that before step S1, the method further comprises:

s0: and arranging a closed space around the platform, and filling inert protective gas in the closed space, wherein the inert protective gas surrounds the structural layer.

By adopting the technical scheme, the whole working environment is sealed, the processing is carried out under the protection state of the protective gas, and no environmental pollution is caused to the outside. If vacuum pumping is carried out, the quantity of cavities in the metal powder can be reduced, particularly the quantity of cavities containing air bubbles is reduced, the number of air holes in the structural layer is reduced, and the structural strength is improved.

The metal powder scraping device is characterized in that a raw material box for receiving scraped metal powder is arranged beside the platform, the raw material box is provided with a vibration screening assembly for screening metal powder meeting preset conditions, the raw material box is provided with a powder feeding and absorbing assembly for conveying the metal powder meeting the preset conditions to the scraping plate, a powder storage groove is formed in the scraping plate, and the metal powder meeting the preset conditions is conveyed into the powder storage groove.

Through adopting above-mentioned technical scheme, the raw material tank has the vibration screening subassembly, screens the metal powder that falls from the scraper blade, then inhales the powder subassembly through the material loading and is sent to the storage powder inslot used repeatedly on the scraper blade.

The automatic powder suction device is further provided with an automatic powder suction assembly which is connected with the scraper and is used for sucking metal powder on the platform and the metal bottom plate, and the automatic powder suction assembly is used for sucking the metal powder near the scraper and conveying the metal powder into the raw material box;

and a metal scrap recovery assembly is arranged beside the machining position.

Through adopting above-mentioned technical scheme, after printing, the scraper blade continues to be scraped, and the automatic powder subassembly of inhaling can suck the near metal powder of scraper blade, avoids the discarded object in disorder, can reuse, environmental protection.

The invention is further arranged in that at least two sets of tool changer tool magazines are arranged beside the platform, wherein one set is positioned in the laser area, and the other set is positioned in the machining position.

By adopting the technical scheme, cutters with different shapes and sizes can be conveniently selected according to different product processes in the cutting process.

The present invention further provides that, in step S7, the method further includes:

and performing finish machining on the product in a five-axis linkage mode, wherein a milling cutter of the machining station has three-dimensional motion, and the metal bottom plate in the machining station and the product perform two-dimensional motion.

By adopting the technical scheme, the processing of complex curved surfaces is facilitated, so that products are prevented from being smoother, and the processing precision is improved; if vacuum exists, the vibration screening assembly can vibrate out air bubbles among the metal powder during screening.

In order to achieve the second purpose, the invention provides the following technical scheme:

a metal 3D printing composite processing device comprises a platform with a laser area, a metal base plate and a milling cutter, wherein the metal base plate is located in the middle of the platform and used for lifting and bearing a printed product, the milling cutter is located corresponding to the printed product, a laser head used for 3D printing is correspondingly arranged on the metal base plate, the laser head is connected with a first moving assembly used for at least two-dimensional movement, and the metal base plate is connected with a second moving assembly used for lifting; a light beam of the laser head is focused on the metal bottom plate;

a manipulator and an image recognition component for scanning the printing structure are arranged beside the platform,

the platform is connected with a scraper for laying metal powder in a sliding manner, and the scraper is provided with a powder storage groove for storing the metal powder;

the other manipulator that is equipped with of platform and the machining station that has another milling cutter, two milling cutter all is connected with the third motion subassembly, the drive of third motion subassembly milling cutter carries out three-dimensional motion, the machining station is equipped with and bears the weight of metal soleplate's processing platform, the processing platform is connected with the fourth motion subassembly that is used for carrying out at least two-dimensional motion, sets up airtight space around the platform the airtight space intussuseption is filled with inert shielding gas, inert shielding gas surrounds the structural layer.

Through adopting above-mentioned technical scheme, this device is used for producing to have the accurate product of outward appearance, and the platform is used for bearing a plurality of motion subassemblies and metal bottom plate. The printed product is formed on the metal base plate layer by layer, the device can realize printing and milling cutter processing at the same time, so that a special-shaped water path required by an injection molding die-casting die is conveniently formed in the product, the die with the special-shaped water path can be cooled more reasonably, the quality of the product obtained by injection molding and die-casting can be better, the cost of using the 3D special-shaped water path on the die is low, and the cooling efficiency is improved by more than 30%; meanwhile, the exhaust effect is achieved by utilizing the characteristic that metal powder is particles to form a die and parts, and the exhaust effect is different from that of common die steel, and any local position can be selected as the exhaust position.

The metal powder scraping device is further provided with a raw material box for receiving scraped metal powder, a vibration screening assembly is arranged on the raw material box and used for screening metal powder meeting preset conditions, a feeding powder absorbing assembly is arranged on the raw material box and used for conveying the metal powder meeting the preset conditions to a scraping plate, a powder storage groove is formed in the scraping plate, and the metal powder meeting the preset conditions is conveyed into the powder storage groove;

the automatic powder suction assembly is connected to the scraper and used for sucking metal powder on the platform and the metal bottom plate, and the automatic powder suction assembly is used for sucking out the metal powder near the scraper and conveying the metal powder into the raw material box;

and a metal scrap recovery assembly used for collecting scrap is arranged beside the machining position.

Through adopting above-mentioned technical scheme, the raw material tank has the vibration screening subassembly, screens the metal powder that falls from the scraper blade, then inhales the powder subassembly through the material loading and is sent to the storage powder inslot used repeatedly on the scraper blade. After printing, the scraper blade continues to scrape, and the automatic powder suction assembly can suck out metal powder near the scraper blade, so that waste scattering is avoided, and the automatic powder suction assembly is reusable and environment-friendly.

The invention is further arranged in that at least two sets of tool magazines are arranged beside the platform, wherein one set is positioned in the laser area, and the other set is positioned in the machining position.

The application has at least the following beneficial effects:

1. in the process that the structural layer is continuously formed, the upper position and the lower position of the milling cutter are adjusted according to the height of the structural layer or a product, a layer is printed and processed, or the milling cutter processes the printed structural layer under the condition that the position of the milling cutter is not in conflict with the position of the laser head, the laser head prints the next layer to be printed, the printing and the processing are realized, and the finish machining is carried out by using a five-axis linkage mode after the printing.

2. The whole working environment is sealed, and the processing is carried out under the protection of protective gas, so that no environmental pollution is caused to the outside. If vacuum pumping is carried out, the quantity of cavities in the metal powder can be reduced, particularly the quantity of cavities containing air bubbles is reduced, the number of air holes in the structural layer is reduced, and the structural strength is improved.

Drawings

FIG. 1 is a schematic flow chart of a method according to a first embodiment of the present invention;

FIG. 2 is a schematic view of the overall structure of the present invention after the enclosed space is opened;

fig. 3 is a schematic view of the internal structure of the enclosed space according to the present invention.

Reference numerals: 1. laser area; 2. a platform; 3. a metal base plate; 4. milling cutters; 5. a lifting groove; 6. a side wall; 7. a partition plate; 8. laser head; 9. a first motion assembly; 10. a second motion assembly; 11. a third motion assembly; 12. an image recognition component; 13. a squeegee; 14. a powder storage tank; 15. a feeding and powder sucking assembly; 16. a raw material tank; 17. a discharge port; 18. vibrating the screening assembly; 19. a powder suction port; 20. an automatic powder suction assembly; 21. machining stations; 22. a manipulator; 23. a fourth motion assembly; 24. a workpiece stage; 25. a rotating base; 26. and a metal scrap recovery assembly.

Detailed Description

The invention is described in detail below with reference to the figures and examples.

The first embodiment is as follows:

a metal 3D printing composite processing method is disclosed, as shown in fig. 2 and fig. 3, based on a platform 2, a metal base plate 3 and a milling cutter 4, wherein the metal base plate 3 is located in the middle of the platform 2 and used for lifting and bearing a printed product, the milling cutter 4 is located at a position corresponding to the printed product, and a manipulator 22 and an image recognition component 12 for scanning the printed structure are arranged beside the platform 2. The platform 2 is horizontally placed, a lifting groove 5 for accommodating the lifting of the metal base plate 3 is arranged in the middle, and the lifting groove 5 is matched with the metal base plate 3 in shape. The lifting groove 5 is provided with a plurality of downwardly extending side walls 6, and the side walls 6 surround the metal base plate 3 to keep the metal powder on the stage 2 from leaking.

As shown in fig. 1, the method comprises the steps of:

s0: an enclosed space is arranged around the platform 2, and inert protective gas is filled in the enclosed space and surrounds the structural layer. The closed space consists of a partition 7, which can withstand the pressure of the internal evacuation. The interior of the container may be filled with nitrogen gas in general. The closed space enables the 3D printing environment to be sealed, and no environmental pollution is caused to the outside. In other cases, if the vacuum is pumped, the amount of cavities in the metal powder, especially the amount of cavities containing air bubbles, can be reduced, the number of air holes in the structural layer can be reduced, and the structural strength can be improved.

S1: metal powder is laid on the platform 2 and the metal base plate 3.

S2: the metal powder is scraped off the surface plate 2 and the metal base plate 3 by a scraper 13. The scraper 13 slides above the platform 2 and is provided with a component for laying metal powder, which can be laid and scraped.

S3: in the laser area 1, one or more laser lasers are used for irradiating metal powder according to a preset at least two-dimensional path, so that the metal powder is sintered into a structural layer with a preset shape. Laser is launched by laser head, and laser head vertical is to metal soleplate 3 transmission, can leave the metal caking of sintering on metal soleplate 3 after laser head removes, according to the path picture of leading-in advance, laser head can carry out the level and print.

S4: the height of the metal bottom plate 3 relative to the platform 2 is reduced, and the height value is the thickness of one structural layer. After one layer and the preliminary printing shaping of structural layer, need let metal soleplate 3 descend one deck height, the height on every layer all is the same, and is relevant with the printing precision of 3D printer.

S5: the image recognition component 12 scans the sintered product. The image recognition component 12 includes a camera for shooting the product, and the camera may be a CCD linear camera, a depth camera, and/or an infrared camera, etc., or may be an existing scanning device, and can generate a 3D model drawing or structural data with the content being a size after scanning.

S6: and comparing the structural data formed by scanning the product to be processed with preset product data to obtain the processing data of the product to be processed, and cutting and finishing the product to be processed according to the processing data.

S7: repeating the step S1 to the step S6 to obtain a molded product; and (3) grabbing the metal bottom plate 3 and the formed product to a machining position 21 beside the platform 2 by using a manipulator 22, wherein the machining position 21 is provided with a milling cutter 4, and the product is subjected to finish machining in depth dimension according to preset depth machining data until the finish machining of the product is finished.

The method can produce 3D printed products with precise appearance, the special-shaped water path required by the injection molding die-casting die is conveniently formed in the 3D printed products, the die with the special-shaped water path can be cooled more reasonably, the quality of the products obtained by injection molding and die-casting can be better, the cost of the 3D special-shaped water path used on the die is low, and the cooling efficiency is improved by more than 30%; meanwhile, the exhaust effect is achieved by utilizing the characteristic that metal powder is particles to form a die and parts, and the exhaust effect is different from that of common die steel, and any local position can be selected as the exhaust position.

Example two:

a metal 3D printing composite processing device for implementing the method according to the embodiment, as shown in fig. 2 and 3, includes a platform 2 having a laser area 1, a metal base plate 3 and a milling cutter 4, wherein the metal base plate 3 is located at a middle portion of the platform 2 and is used for lifting and carrying a printed product. The platform 2 is horizontally placed, a lifting groove 5 for accommodating the metal base plate 3 to lift is arranged in the middle of the platform, the lifting groove 5 is matched with the shape of the metal base plate 3, and the lifting groove 5 is square in the embodiment. The lifting groove 5 is provided with a plurality of downwardly extending side walls 6, and the side walls 6 surround the metal base plate 3 to keep the metal powder on the stage 2 from leaking.

A frame-based enclosed space is provided around the platform 2, consisting of partitions 7, which can withstand the pressure of the internal evacuation. And filling inert protective gas in the closed space, wherein the inert protective gas surrounds the structural layer. The interior of the container may be filled with nitrogen gas in general. The closed space enables the 3D printing environment to be sealed, and no environmental pollution is caused to the outside. In other cases, if the vacuum is pumped, the amount of cavities in the metal powder, especially the amount of cavities containing air bubbles, can be reduced, the number of air holes in the structural layer can be reduced, and the structural strength can be improved.

The metal base plate 3 corresponds and is provided with the laser radium-shine head 8 that is used for 3D to print, metal base plate 3 is aimed at to laser radium-shine head 8, laser radium-shine head 8 is connected with the first motion subassembly 9 that is used for at least two-dimensional motion, first motion subassembly 9 is including the moving system who installs the at least biaxial on the frame, the biaxial includes X axle and Y axle, the X axle carries out horizontal migration, the Y axle is installed and is carried out vertical horizontal migration on the X axle, laser radium-shine head 8 can install and carry out two-dimensional motion on the Y axle, laser radium-shine head 8's light beam focuses on metal base plate 3. The metal base plate 3 is connected with a second moving assembly 10 for lifting, and the second moving assembly 10 can adopt an electric cylinder, a ball screw or a hydraulic cylinder for carrying out numerical lifting action.

A second Y-axis is provided on the first moving assembly 9 and a Z-axis is provided on the second Y-axis to form a third moving assembly 11, or the third moving assembly 11 is provided separately and not in common with the first moving assembly 9. The third motion subassembly 11 that sets up alone is including installing the triaxial moving system on the frame, and the triaxial includes X axle, Y axle and Z axle, and the X axle carries out horizontal migration, and the Y axle is installed and is carried out vertical horizontal migration on the X axle, and the Z axle is installed and is carried out vertical migration on the Y axle, and laser head 8 can install and carry out two-dimensional motion on the Y axle, and laser head 8's light beam focuses on metal soleplate 3. The milling cutter 4 can be installed on the Z axis, the position of the milling cutter 4 corresponds to a printed product, and the milling cutter 4 is provided with a driving device to carry out cutting finishing processing on the product.

The manipulator 22 and the image recognition component 12 for scanning the printing structure are arranged beside the platform 2, the image recognition component 12 comprises a camera for shooting a product, the camera can be a CCD linear camera, a depth camera, an infrared camera and/or the like, or an existing scanning device is adopted, and a 3D model drawing or structural data with the content as the size can be generated after scanning.

A scraper 13 for laying metal powder is connected to the platform 2 in a sliding manner, and the scraper 13 can be driven by a horizontally transverse air cylinder. The scraper 13 is provided with a powder storage tank 14 for storing metal powder, and the powder storage tank 14 can be provided with an opening with an upward opening or can be in a closed design. Store up powder groove 14 and be connected with the material loading that is used for carrying metal powder and inhale powder subassembly 15, the powder subassembly 15 is inhaled including providing power pump and pipeline to the material loading, and the export of pump passes through the pipeline and stores up powder groove 14 intercommunication, and the entry of pump passes through the pipeline intercommunication and has former feed tank 16, and the junction is located the bottom of former feed tank 16. The platform 2 is provided with a discharge port 17 for flowing out metal powder, and an inlet of the raw material box 16 is aligned to the discharge port 17 or is connected with the discharge port 17 through a pipeline, so that metal dust diffusion during discharging is avoided. Raw materials case 16 is used for receiving the metal powder of being scraped discharge gate 17 by scraper blade 13, is equipped with vibration screening subassembly 18 in the raw materials case 16, and vibration screening subassembly 18 can adopt shale shaker and drive shale shaker to carry out the drive arrangement that the vibration screened, and vibration screening subassembly 18 is used for sieving the metal powder that accords with the preset condition. The feeding powder-sucking assembly 15 conveys the screened metal powder meeting the preset conditions to the powder storage tank 14.

The scraper 13 is provided with a powder suction port 19, the powder suction port 19 faces the metal powder, and the powder suction port 19 is connected with an automatic powder suction assembly 20 for sucking the metal powder on the platform 2 and the metal base plate 3. The automatic powder suction assembly 20 can be a vacuum cleaner or a pump for sucking dust, an air inlet of the automatic powder suction assembly is connected with the powder suction port 19 through a pipeline, and an air outlet of the automatic powder suction assembly is connected with the raw material tank 16. The automatic powder suction assembly 20 is used for sucking out the metal powder near the scraper 13 and conveying the metal powder into the raw material box 16. The air outlet of the automatic powder suction assembly 20 is located above the vibrating screening assembly 18, the inlet of the feeding powder suction assembly 15 is located below the vibrating screening assembly 18, and metal powder meeting the requirements after screening is received. The channel and the pipeline are made of soft materials.

A manipulator 22 and a machining station 21 with another milling cutter 4 are arranged beside the platform 2, at least two sets of tool magazines are arranged beside the platform 2, one set is positioned in the laser area 1, and the other set is positioned in the machining station 21. The robot 22 is located between the platform 2 and the machining station 21. The robot 22 may employ a sliding gripper or a multi-axis rotary gripper. If a sliding mechanical claw is adopted, the mechanical claw is arranged on a truss. The two milling cutters 4 are identical in structure, and are respectively connected with third moving assemblies 11 which are identical in structure. The third motion assembly 11 drives the milling cutter 4 to move in three dimensions, the machining station 21 is provided with a machining table for bearing the metal base plate 3, the machining table is connected with a fourth motion assembly 23 for performing at least two-dimensional motion, the fourth motion assembly 23 comprises a workpiece table 24 rotating along a horizontal shaft, a rotating seat 25 is rotatably connected on the workpiece table 24, and the rotating axis of the rotating seat 25 is perpendicular to the plane of the workpiece table 24. The fourth motion assembly 23 and the third motion assembly 11 form five-axis linkage machining. A metal scrap recovery assembly 26 is arranged beside or below the machining position 21, and the metal scrap recovery assembly 26 can adopt a recovery box or a recovery box with a dust collection function.

The device is directly made into a product with precise appearance, a special-shaped water path required by the injection molding die-casting die is conveniently formed in the device, the die with the special-shaped water path can be cooled more reasonably, the quality of the product obtained by injection molding and die-casting can be better, the cost of the 3D special-shaped water path used on the die is low, and the cooling efficiency is improved by more than 30%; meanwhile, the exhaust effect is achieved by utilizing the characteristic that metal powder is particles to form a die and parts, and the exhaust effect is different from that of common die steel, and any local position can be selected as the exhaust position.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. A metal 3D printing composite processing method is based on a platform (2), a metal base plate (3) and a milling cutter (4), wherein the metal base plate (3) is located in the middle of the platform (2) and used for lifting and bearing a printed product, the milling cutter (4) is located at a position corresponding to the printed product, a manipulator (22) and an image recognition assembly (12) used for scanning a printed structure are arranged beside the platform (2), and the method is characterized by comprising the following steps:

s1: laying metal powder on the platform (2) and the metal bottom plate (3);

s2: using a scraper (13) to scrape metal powder on the platform (2) and the metal bottom plate (3);

s3: in the laser area (1), one or more laser lasers are used for irradiating metal powder according to a preset at least two-dimensional path, so that the metal powder is sintered into a structural layer with a preset shape;

s4: reducing the height of the metal bottom plate (3) relative to the platform (2), wherein the height is the thickness of one structural layer;

s5: the image recognition component (12) scans the sintered product;

s7: repeating the step S1 to the step S6 to obtain a molded product; and (3) grabbing the metal bottom plate (3) and the formed product to a machining station (21) beside the platform (2) by using a manipulator (22), wherein the machining station (21) is provided with a milling cutter (4) and carries out finish machining on the product in depth dimension according to preset depth machining data until the finish machining of the product is finished.

2. The metal 3D printing composite processing method according to claim 1, wherein the step S6 further comprises:

the milling cutter (4) and the structural layer to be cut and trimmed or cut and trimmed are kept in a relative height position difference smaller than a set range;

and after the structural layer is cut and trimmed, the milling cutter (4) moves to a position corresponding to the next structural layer.

3. The metal 3D printing composite processing method according to claim 1, wherein the method further comprises, before step S1:

s0: and arranging a closed space around the platform (2), and filling inert protective gas in the closed space, wherein the inert protective gas surrounds the structural layer.

4. The metal 3D printing composite processing method according to claim 1, wherein a raw material box (16) for receiving the scraped metal powder is arranged beside the platform (2), the raw material box (16) is provided with a vibration screening component (18), the vibration screening component (18) is used for screening the metal powder meeting preset conditions, the raw material box (16) is provided with a feeding and powder sucking component (15) for conveying the metal powder meeting the preset conditions to the scraper (13), a powder storage groove (14) is formed in the scraper (13), and the metal powder meeting the preset conditions is conveyed into the powder storage groove (14).

5. The metal 3D printing composite processing method according to claim 4, characterized in that an automatic powder suction assembly (20) for sucking the metal powder on the platform (2) and the metal bottom plate (3) is connected to the scraper (13), and the automatic powder suction assembly (20) is used for sucking the metal powder near the scraper (13) and conveying the metal powder into the raw material box (16);

and a metal scrap recovery assembly (26) is arranged beside the machining station (21).

6. The metal 3D printing composite processing method according to claim 1, characterized in that at least two sets of tool magazines are arranged beside the platform (2), wherein one set is located in the laser area (1) and the other set is located in the machining position (21).

7. The metal 3D printing composite processing method according to claim 3, wherein the step S7 further comprises:

and (2) performing finish machining on the product in a five-axis linkage mode, wherein the milling cutter (4) of the machining station (21) has three-dimensional motion, and the metal bottom plate (3) in the machining station (21) and the product perform two-dimensional motion.

8. A metal 3D printing composite processing device comprises a platform (2) with a laser area (1), a metal base plate (3) and a milling cutter (4), wherein the metal base plate (3) is located in the middle of the platform (2) and used for lifting and bearing a printed product, the metal base plate is characterized in that the milling cutter (4) is located corresponding to the printed product, a laser head (8) used for 3D printing is correspondingly arranged on the metal base plate (3), the laser head (8) is connected with a first moving assembly (9) used for at least two-dimensional movement, and the metal base plate (3) is connected with a second moving assembly (10) used for lifting; the light beam of the laser head (8) is focused on the metal bottom plate (3);

a manipulator (22) and an image recognition component (12) for scanning the printing structure are arranged beside the platform (2),

the platform (2) is connected with a scraper (13) used for laying metal powder in a sliding manner, and the scraper (13) is provided with a powder storage groove (14) used for storing the metal powder;

platform (2) other machine that is equipped with manipulator (22) and has another milling cutter (4) adds station (21), two milling cutter (4) all are connected with third motion subassembly (11), third motion subassembly (11) drive milling cutter (4) carry out three-dimensional motion, machine adds station (21) and is equipped with and bears the weight of the processing platform of metal soleplate (3), the processing platform is connected with fourth motion subassembly (23) that are used for carrying out at least two-dimensional motion, sets up airtight space around platform (2) the airtight space intussuseption is filled with inert shielding gas, inert shielding gas surrounds the structural layer.

9. The metal 3D printing and composite processing device according to claim 8, wherein a raw material box (16) for receiving the scraped metal powder is arranged beside the platform (2), the raw material box (16) is provided with a vibration screening component (18), the vibration screening component (18) is used for screening out the metal powder meeting preset conditions, the raw material box (16) is provided with a feeding and powder absorbing component (15) for conveying the metal powder meeting the preset conditions to the scraper (13), a powder storage groove (14) is formed in the scraper (13), and the metal powder meeting the preset conditions is conveyed into the powder storage groove (14);

the scraper (13) is connected with an automatic powder suction assembly (20) for sucking metal powder on the platform (2) and the metal bottom plate (3), and the automatic powder suction assembly (20) is used for sucking the metal powder near the scraper (13) and conveying the metal powder into the raw material box (16);

and a metal scrap recovery assembly (26) for collecting waste scraps is arranged beside the machining station (21).

10. The metal 3D printing and composite processing device according to claim 8, wherein at least two sets of tool magazines are arranged beside the platform (2), one set is located in the laser area (1) and the other set is located in the machining position (21).