CN114193763A

CN114193763A - 3D printing method and device for multi-material selective area powder laying selective area sintering

Info

Publication number: CN114193763A
Application number: CN202111455708.2A
Authority: CN
Inventors: 李发发; 侯雅青; 刘和平; 苏航
Original assignee: China Iron and Steel Research Institute Group
Current assignee: China Iron and Steel Research Institute Group
Priority date: 2021-12-01
Filing date: 2021-12-01
Publication date: 2022-03-18

Abstract

The application relates to the technical field of material increase manufacturing by selective laser sintering, in particular to a 3D printing method and a device for selective powder spreading and selective sintering of multiple material selective areas, comprising the following steps: spraying a resin layer with one layer thickness on the substrate; milling a first groove on the cured resin layer according to the configuration of the prefabricated first material; laying powder of the first material in the first groove; sintering and solidifying the powder of the first material in the first groove; milling a second groove on the cured resin layer according to the configuration of a prefabricated second material; laying powder of the second material in the second groove; the powder of the second material in the second groove is sintered and solidified, so that the problems of the existing additive manufacturing technology in multi-material multi-scale 3D printing can be solved, and heterogeneous multi-material, macro/micro/nano multi-scale integrated manufacturing and material/structure/device integrated manufacturing are realized.

Description

3D printing method and device for multi-material selective area powder laying selective area sintering

Technical Field

The application relates to the technical field of material increase manufacturing through selective laser sintering, in particular to a 3D printing method and device for selective sintering of multiple material selective areas and powder laying selective areas.

Background

With the rapid development of many high-end technical fields such as aerospace, tissue engineering, biomedical, flexible electronics, robots and the like, the functional requirements on parts and materials are higher and higher. Parts made from a single material or homogeneous materials have become increasingly difficult to meet product-to-part performance requirements. The part should be designed and manufactured for its optimal performance or functional requirements to meet the requirements of its product in use. In the 21 st century, functionally graded material parts which realize perfect combination of material organization structures, product performance and functions become a hot problem for scientific research.

The 3D printing technology realizes the manufacture of objects with almost any geometric shapes, is applied to the fields of aerospace, organizational projects, biological medical treatment, automobiles, household appliances, flexible electronics, cultural originality, new materials, new energy, robots, buildings and the like at present, shows that the 3D printing technology with wide application prospect is developing from the traditional shape control to the controllability, from single materials to multi-materials, from the macro-scale to the micro-scale and the macro/micro/nano cross-scale, aims to realize the integrated manufacture of 'materials-structures-devices' driven by functions, realizes the multifunction and light weight of products, and finally realizes 'creation materials', 'creation objects' and 'creation' through multi-material multi-scale material increase manufacture.

Multi-material 3D printers such as the Stratasys Objet500Connex33D and J750 printer, the Voxel8 multi-material 3D electronic printer, the 3DSystems multi-material composite 3D printer, PROJET5500X, and the like, have been developed with the following disadvantages and limitations:

(1) the printing resolution is also low, and the printing of micro-scale feature structures is difficult to realize, especially macro/micro/nano multi-scale and cross-scale manufacturing cannot be realized;

(2) the existing multi-material 3D printing technology basically adopts multi-spray heads or a mechanical premixing method to print layer by layer in an overlapping way, and has the problems of uneven mixing of multiple materials, uncontrollable printing in selected areas and the like.

In 2015, researchers at Harvard university propose an active mixing multi-material printing head, and a rotary propeller is arranged in a micro-nozzle to realize efficient and uniform mixing of multiple materials. So far, relevant researches such as theories and experiments related to multi-material 3D printing at home and abroad are rarely reported.

Therefore, how to solve the problems of the existing additive manufacturing technology in multi-material multi-scale 3D printing is a key technical problem to be solved by those skilled in the art, and how to realize heterogeneous multi-material selective area manufacturing, macro/micro/nano multi-scale integrated manufacturing, and material/structure/device integrated manufacturing.

Disclosure of Invention

In order to overcome the problems in the related art at least to a certain extent, the application aims to provide a multi-material selective area powder spreading selective area sintering 3D printing method and device, which can solve the problems of the existing additive manufacturing technology in multi-material multi-scale 3D printing, and realize heterogeneous multi-material selective area manufacturing, macro/micro/nano multi-scale integrated manufacturing and material/structure/device integrated manufacturing. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the application are described in detail in the following.

The application provides a 3D printing method for powder laying and selective area sintering in a multi-material selective area, which comprises the following steps:

spraying a resin layer with one layer thickness on the substrate;

milling a first groove on the cured resin layer according to the configuration of the prefabricated first material;

laying powder of the first material in the first groove;

sintering and solidifying the powder of the first material in the first groove;

milling a second groove on the cured resin layer according to the configuration of a prefabricated second material;

laying powder of the second material in the second groove;

sintering and solidifying the powder of the second material in the second groove.

Preferably, the method further comprises the following steps:

delivering powder of the first material to the first recess by an inert gas;

alternatively, the powder of the second material is delivered to the second recess by an inert gas.

The application provides 3D printing device of many materials election district shop powder election district sintering, based on as above 3D printing method of many materials election district shop powder election district sintering, include:

a resin spraying module for spraying a resin layer one layer thick on the substrate;

the milling module is used for milling a first groove on the cured resin layer according to the configuration of the prefabricated first material; milling a second groove on the cured resin layer according to the configuration of a prefabricated second material;

a powder laying module for laying powder of the first material in the first groove; for laying down powder of the second material in the second groove;

the laser module is used for sintering and solidifying the powder of the first material in the first groove; for sintering and solidifying the powder of the second material in the second groove.

Preferably, the method further comprises the following steps:

the powder recovery module is used for cleaning and recovering the scattered powder of the first material; for cleaning and recovering the scattered powder of the second material.

Preferably, the method further comprises the following steps:

the forming platform is provided with a through hole, and the substrate is arranged in the through hole in a lifting manner through a lifting drive.

Preferably, the resin injection module is provided with:

a resin injection groove for injecting resin;

a resin delivery pipe for communicating with the resin storage tank;

and a resin curing lamp for curing the resin layer.

Preferably, the powder lay-up module is provided with:

the powder dropping groove is used for outputting powder;

the powder conveying pipe is used for being communicated with the powder storage tank;

and the scraper is used for scraping the powder.

Preferably, the milling module is provided with a dust collector and a dust recovery pipe, and the dust collector is communicated with the dust recovery tank through the dust recovery pipe.

Preferably, the powder recovery module is provided with a powder cleaning brush, a powder cleaning dust collector and a powder recovery pipe, and the powder cleaning dust collector is communicated with the powder recovery tank through the powder recovery pipe.

Preferably, the resin ejection module, the powder placement module, and the powder recovery module are driven to displace relative to the base plate by a first guide rail; the milling module is driven to displace relative to the substrate by a second guide rail.

The technical scheme provided by the application can comprise the following beneficial effects:

the powder of every kind of material mills, shop's powder, sintering in proper order on the resin layer, can realize printing the powder of multiple different kind of materials in the optional position of base plate, and the successive layer superposes, can realize finally that the 3D of multiple material prints in xyz orientation optional position, and final 3D prints the piece and is lived by resin parcel, also is favorable to reducing because the deformation that thermal stress produced to because the support operation of resin, can carry out unsupported printing, further improve the precision.

By the arrangement, the 3D printing method can realize free laying of multiple materials for single-layer selection and interlayer switching at the same time, and can solve the following problems:

1. the printable material variety number is not limited, the metal/nonmetal powder used for additive manufacturing can be molded at one time, and an innovative solution is provided for manufacturing the structure-function integrated composite material.

2. The raw material adopts nano/micron-sized powder, the printing resolution is high, different materials can be accurately positioned at specific positions, the scale precision of each material can be controlled at a nanometer level according to the precision of the raw material, and the macro/micro/nano cross-scale manufacturing can be realized by layer-by-layer superposition.

3. The material system is not limited, and is suitable for metal-metal powder, nonmetal-nonmetal powder and metal-nonmetal powder. The sintering process is regulated, and an unlimited material system and additive manufacturing can be realized.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic illustration of a structural distribution of the present multi-material selective area powder laying selective area sintered 3D printing device, according to some exemplary embodiments;

FIG. 2 is a schematic rail drive diagram of the present multi-material selective area powder selective area sintered 3D printing device, according to some exemplary embodiments;

FIG. 3 is a block diagram of the present multi-material selective area powder selective area sintered 3D printing device, according to some exemplary embodiments;

FIG. 4 is a schematic diagram of a milling module according to some exemplary embodiments;

FIG. 5 is an integrated schematic diagram of a resin injection module, a powder dusting module, and a powder recovery module, shown in accordance with some example embodiments.

In the figure: 1. a substrate; 2. a milling module; 3. a resin injection module; 4. powder paving module; 5. a powder recovery module; 6. a laser module; 7. a forming platform; 8. a molding cabin; 11. a forming cylinder; 12. a z-axis motor; 21. a dust collector; 22. a dust recovery pipe; 23. milling a motor; 24. milling a cutter head; 25. an x-axis guide rail; 26. an x-axis motor; 27. a second y-axis motor; 28. a second y-axis guide rail; 31. a resin injection groove; 32. a resin delivery pipe; 33. a resin curing lamp; 34. a connecting rod; 35. a first y-axis guide rail; 36. a first y-axis motor; 41. a powder falling groove; 42. a powder delivery pipe; 43. a scraper; 44. a powder storage tank; 51. cleaning the hairbrush with powder; 52. a powder cleaning dust collector; 53. a powder recovery tube; 71. a recovery tank.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus or methods consistent with aspects of the present application.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the contents of the invention described in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.

Referring to fig. 1 to 5, the present embodiment provides a 3D printing method for multi-material selective area powder laying selective area sintering, including:

spraying a resin layer one layer thick on the substrate 1;

it should be noted that 3D printing is printing layer by layer to form a three-dimensional configuration to be printed. Here, before printing one layer at a time, the resin is filled one layer thick with the resin to form a resin layer. Wherein the one layer has a thickness of 0.025 to 0.04mm, preferably 0.03 mm; and the resin is preferably a photosensitive resin so as to be cured by irradiation of the resin curing lamp 33.

wherein the first groove has a groove depth of one layer thickness such that the first groove can penetrate the resin layer to enable the configuration of the first material between the layers to be joined together.

Laying powder of a first material in the first groove;

sintering and solidifying the powder of the first material in the first groove;

here, when sintering and solidifying the powder of the first material, it is to be ensured that the powder is uniformly distributed in the first groove and is flush with the upper edge of the first groove, specifically, the laser energy can be automatically controlled by a program, a printing area where the first groove is sintered is scanned, the powder in the first groove is sintered and solidified into a block by the powder, and the printing of the layer of the first material is completed.

Milling a second groove on the cured resin layer according to the configuration of the prefabricated second material;

wherein the second groove has a groove depth of one layer thickness such that the second groove can penetrate the resin layer to enable the configuration of the second material between the layers to be joined together.

Laying powder of a second material in the second groove;

Here, when sintering and solidifying the powder of the second material, it is to be ensured that the powder is uniformly distributed in the second groove and is flush with the upper edge of the second groove, specifically, the laser energy can be automatically controlled by a program, a printing area where the second groove is sintered is scanned, the powder in the second groove is sintered and solidified into a block by the powder, and the printing of the layer of the second material is completed.

The above steps are circulated, the powder of each material is milled, spread and sintered on the resin layer in sequence, the powder of various different materials can be printed at any position of the substrate 1, the materials are overlapped layer by layer, the 3D printing of various materials at any position of the xyz direction can be finally realized, the final 3D printing part is wrapped by the resin, the deformation caused by thermal stress can be reduced, and the precision is further improved.

It should be noted that when the first groove and the second groove are milled in the resin layer, the milling may be performed simultaneously or sequentially, and the milling may be designed according to the distribution of each material in the actual configuration.

2. The printing resolution is high, different materials can be accurately positioned to specific positions, the scale precision of each material is controlled at the nanometer level, and macro/micro/nano cross-scale manufacturing can be realized.

Further, the 3D printing method for sintering in the powder laying and selecting area of the multi-material selecting area further comprises the following steps:

delivering powder of a first material to the first recess by an inert gas;

The powder of the first material or the second material is conveyed by the inert gas in order to ensure the stability of material conveying, and the stability of the inert gas can avoid the chemical reaction of the material and the surrounding gas in the conveying process, so that the purity of the material is ensured.

The application also provides a 3D printing device for multi-material selective area powder laying selective area sintering, and a 3D printing method based on multi-material selective area powder laying selective area sintering comprises a resin spraying module 3, a milling module 2, a powder laying module 4 and a laser module 6.

Wherein, the resin spraying module 3 is used for spraying a resin layer with one layer thickness on the substrate 1; specifically, the layer thickness of the resin layer can be accurately controlled according to the ejection time, the ejection rate, and the ejection amount of the resin ejection module 3, thereby facilitating control of the layer thickness, and the accuracy of 3D printing.

The milling module 2 is used for milling a first groove on the cured resin layer according to the configuration of the prefabricated first material; for milling a second groove in the cured resin layer according to the configuration of the prefabricated second material. When the first groove and the second groove are milled on the resin layer, the milling can be performed simultaneously or sequentially, and the design can be performed according to the distribution of each material in the actual configuration.

The powder paving module 4 is used for paving powder of a first material in the first groove; for laying down powder of the second material in the second recess. For the laying of various materials, the powder laying module 4 may be correspondingly provided in plurality so as to correspond one-to-one to the various materials, avoiding contamination between the materials. Of course, various materials can be paved through one powder paving module 4, and only the pipeline residual powder is needed to be avoided.

The laser module 6 is used for sintering and solidifying the powder of the first material in the first groove; for sintering and solidifying the powder of the second material in the second recess.

Here, when printing each material, the processes of milling the groove, laying the powder, and sintering and curing may be sequentially performed on the resin layer, ensuring independence between each material.

Through this 3D printing device of powder election district sintering is spread in many material election district, the powder that can make every kind of material mills in proper order on the resin layer, shop's powder, sintering, can realize printing the powder of multiple different kind of materials in the optional position of base plate 1, the successive layer stack, finally can realize printing in the 3D of the multiple material of xyz orientation optional position, final 3D prints the piece and is lived by resin coating, also be favorable to reducing because the deformation that thermal stress produced, further improve the precision.

So set up, this 3D printing device can realize the many materials of individual layer election district and switching between the layer simultaneously and freely lay, through this 3D printing device, can solve following problem:

2. The printing resolution is high, different materials can be accurately positioned to specific positions, the dimension precision of each material is controlled at the micron level, and macro/micro/nano cross-scale manufacturing can be realized.

Further, the 3D printing device for sintering in the powder paving and selecting areas in the multi-material selecting area further comprises a powder recycling module 5, wherein the powder recycling module is used for cleaning and recycling the powder of the scattered first material; for cleaning and recovering the scattered powder of the second material.

In the 3D printing process, after the powder of each material is milled, laid and sintered on the resin layer in sequence, the scattered powder is required to be cleaned and recovered through the powder recovery module 5, so that the laying and sintering of different material powders in different molding areas can be realized, and the different material powders cannot be polluted each other.

Thus, the powder recovery module 5 can realize the primary powder laying, sintering and primary powder recovery. Therefore, the powder of different materials can not be scattered on the base plate 1 and the forming platform 7 in disorder, and the scattered powder can be cleaned up. Thereby solving the problems of mutual mixing and mutual pollution between different materials.

The 3D printing device for the multi-material selective area powder laying selective area sintering further comprises a forming platform 7, wherein the forming platform 7 is provided with a through hole, and the through hole is located in the middle of the forming platform 7 and used for embedding the substrate 1; the substrate 1 is set in the through hole in a liftable manner by lifting drive, so that the upper surface of the substrate 1 is parallel to the upper surface of the forming table 7 and can be superposed.

When 3D prints, at first keep the upper surface of base plate 1 and the upper surface coincidence of shaping platform 7, accomplish the printing of first layer thickness on base plate 1, drive base plate 1 through the lift drive and descend a layer thickness for shaping platform 7 to make the upper surface of first layer thickness and the upper surface coincidence of shaping platform 7, and then accomplish the printing of second layer thickness. So, need not to carry out the ascending displacement of vertical side to other structures, can realize the successive layer of 3D configuration and print.

Specifically, as shown in fig. 3, the lifting drive includes a forming cylinder 11 and a z-axis motor 12, and the z-axis motor 12 is in transmission connection with the substrate 1 to drive the substrate 1 to lift.

Of course, a molding bay 8 is formed on the molding platform 7 to protect the 3D printing.

In some preferred embodiments, the resin ejection module 3 is provided with a resin ejection slot 31, a resin delivery pipe 32, and a resin curing lamp 33. Wherein the resin delivery pipe 32 is adapted to communicate with the resin storage tank so that the resin ejection module 3 communicates with the resin storage tank, and the resin in the resin storage tank can be delivered to the inside of the resin ejection module 3 by the inert gas; the resin injection groove 31 is used for injecting resin, and can inject the resin inside the resin injection module 3 onto the substrate 1 to form a resin layer; the resin curing lamp 33 is used for curing the resin layer, and specifically, the resin curing lamp 33 is disposed at a rear position of the resin injection groove 31, that is, the resin injection groove 31 outputs the resin before the resin is irradiated and cured by the resin curing lamp 33. Therefore, the resin can be ensured to be cured and shaped in time, and the stability of the resin is ensured.

As shown in fig. 5, the powder placement module 4 is provided with a powder dropping groove 41, a powder conveying pipe 42, and a scraper 43. Wherein, the powder conveying pipe 42 communicates the powder paving module 4 with the powder storage tank 44, and can convey the powder to the powder paving module 4, so as to output the powder through the powder dropping groove 41, and finish the output and laying of the powder.

In order to ensure a smooth and even powder application, the powder is scraped off by means of a scraper 43.

Wherein, since the powder paving module 4 is used for powder paving of a plurality of materials, a plurality of powder storage tanks 44 need to be connected through the powder conveying pipe 42, and correspondingly, the powder conveying pipe 42 is provided with a plurality of branches.

As shown in fig. 4, the milling module 2 is provided with a dust collector 21 and a dust recovery pipe 22, and the dust collector 21 communicates with the dust recovery tank through the dust recovery pipe 22. Thus, when the resin layer is milled, the milled dust can be recycled, and the 3D processing is prevented from being influenced.

Of course, the milling module 2 is also provided with a milling cutter head 24 and a milling motor 23.

The powder recovery module 5 is provided with a powder cleaning brush 51, a powder cleaning dust collector 52 and a powder recovery pipe 53, and the powder cleaning dust collector 52 communicates with the powder recovery tank through the powder recovery pipe 53. Therefore, after the powder is solidified, the redundant powder can be recycled, and the mixed pollution of various powders is avoided.

In order to keep the forming platform 7 clean, two recovery grooves 71 are provided on the forming platform 7, and the two recovery grooves 71 are respectively located at two sides of the substrate 1, so that the excess powder can be disposed through the recovery grooves 71.

In some embodiments, the resin spray module 3, the powder placement module 4, and the powder recovery module 5 are displaced relative to the base plate 1 by a first rail drive;

wherein the resin ejection module 3, the powder placement module 4, and the powder recovery module 5 are integrated and can be simultaneously displaced with respect to the substrate 1. Specifically, the first guide rail drive comprises a first y-axis guide rail 35 and a first y-axis motor 36, the whole of the resin injection module 3, the powder paving module 4 and the powder recovery module 5 can be slidably arranged on the first y-axis guide rail 35, and displacement is driven through the first y-axis motor 36, so that the operation is stable, accurate and reliable.

Wherein, the whole of resin spraying module 3, powder shop powder module 4 and powder recovery module 5 sets up on connecting rod 34, and first y axle guide rail 35 is provided with two, sets up respectively in base plate 1 both sides, and the both ends of connecting rod 34 respectively with first y axle guide rail 35 sliding connection.

The milling module 2 is driven by a second guide rail to move relative to the substrate 1, specifically, the second guide rail drive comprises an x-axis guide rail 25, an x-axis motor 26, a second y-axis guide rail 28 and a second y-axis motor 27, the milling module 2 is slidably arranged on the x-axis guide rail 25 and is driven by the x-axis motor 26 to move, the x-axis guide rail 25 is slidably arranged on the second y-axis guide rail 28 and is driven by the second y-axis motor 27 to move, and the operation is stable, accurate and reliable.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below.

Case (2): a 100mm diameter 304 stainless steel insert 50mm diameter copper alloy workpiece was printed.

Step 1: the resin spraying module 3 sprays a resin layer with the layer thickness of 30 microns on the forming platform 7 and irradiates and cures.

Step 2: the milling module 2 mills a groove with the diameter of 50mm and the layer thickness of 30 microns on the resin layer solidified and formed in the last step, and the dust collector 21 on the milling module 2 sucks and cleans the milled dust.

And step 3: conveying a certain amount of copper alloy powder to the powder paving module 4 through the powder conveying pipe 42 under the control of a computer, and paving the powder through the powder paving module 4 to enable the copper alloy powder to fill the groove area milled in the step 2; and controlling the laser module 6 to selectively sinter, and sintering and molding the copper alloy powder in the area with the diameter of 50 mm.

And 4, step 4: the powder cleaning dust collector 52 at the rear side of the powder paving module 4 cleans and recovers the copper alloy powder scattered on the forming platform 7.

And 5: the milling module 2 mills a circular ring area of 304 stainless steel powder with the diameter of 100mm, the inner diameter of 50mm and the layer thickness of 30 microns according to the planned path, and the dust collector 21 on the milling module 2 sucks the milled dust away and cleans the dust.

Step 6: conveying a certain amount of 304 stainless steel powder to the powder paving module 4 through the powder conveying pipe 42 under the control of a computer, and paving the powder through the powder paving module 4 to enable the 304 stainless steel powder to fill the groove area milled in the step 5; and (4) selectively sintering the laser module 6, and sintering and molding 304 stainless steel powder.

And 7: the powder cleaning dust collector 52 at the rear side of the powder laying module 4 cleans and recovers the 304 stainless steel powder scattered on the forming platform 7.

The substrate 1 is descended by one layer thickness, and then the steps 1 to 7 are repeated, so that the laser sintering forming of different positions of different materials of the copper alloy and the 304 stainless steel powder can be realized.

It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like as used herein, are intended to indicate an orientation or positional relationship relative to that shown in the drawings, but are merely used to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description herein, it is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments. The multiple schemes provided by the application comprise basic schemes of the schemes, are independent of each other and are not restricted to each other, but can be combined with each other under the condition of no conflict, so that multiple effects are achieved together.

While embodiments of the present application have been shown and described above, it is to be understood that the above embodiments are exemplary and not to be construed as limiting the present application, and that changes, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. A3D printing method for multi-material selective area powder laying selective area sintering is characterized by comprising the following steps:

spraying a resin layer with one layer thickness on the substrate (1);

laying powder of the first material in the first groove;

sintering and solidifying the powder of the first material in the first groove;

laying powder of the second material in the second groove;

2. The method for 3D printing of multi-material selective area powder laying selective area sintering of claim 1, further comprising:

delivering powder of the first material to the first recess by an inert gas;

3. A 3D printing apparatus for multi-material selective area powder laying selective area sintering based on the 3D printing method for multi-material selective area powder laying selective area sintering as claimed in claims 1-2, comprising:

a resin spraying module (3) for spraying a resin layer one layer thick on the substrate (1);

a milling module (2) for milling a first groove on the cured resin layer according to the configuration of the prefabricated first material; milling a second groove on the cured resin layer according to the configuration of a prefabricated second material;

a powder laying module (4) for laying a powder of the first material in the first recess; for laying down powder of the second material in the second groove;

a laser module (6) for sintering and solidifying the powder of the first material in the first groove; for sintering and solidifying the powder of the second material in the second groove.

4. The multi-material selective area powder laying selective area sintering 3D printing device according to claim 3, further comprising:

a powder recovery module (5) for cleaning and recovering the scattered powder of the first material; for cleaning and recovering the scattered powder of the second material.

5. The multi-material selective area powder laying selective area sintering 3D printing device according to claim 3, further comprising:

the forming platform (7), the forming platform (7) is provided with the through-hole, base plate (1) through lift drive set up liftably in the through-hole.

6. A multi-material selective area powder laying selective area sintering 3D printing device according to claim 3, characterized in that the resin injection module (3) is provided with:

a resin injection groove (31) for injecting resin;

a resin delivery pipe (32) for communicating with the resin storage tank;

and a resin curing lamp (33) for curing the resin layer.

7. A multi-material selective area powder selective area sintered 3D printing device according to claim 3, characterized in that the powder spreading module (4) is provided with:

a powder dropping groove (41) for outputting powder;

a powder delivery tube (42) for communicating with a powder storage tank (44);

a scraper (43) for scraping the powder.

8. 3D printing device for multi-material selective area powder laying selective area sintering according to claim 3, characterized in that the milling module (2) is provided with a dust collector (21) and a dust recovery pipe (22), the dust collector (21) being in communication with a dust recovery tank through the dust recovery pipe (22).

9. A multi-material selective area powder-spreading selective area sintering 3D printing device according to claim 4, characterized in that the powder recovery module (5) is provided with a powder cleaning brush (51), a powder cleaning dust collector (52) and a powder recovery pipe (53), the powder cleaning dust collector (52) being in communication with a powder recovery tank through the powder recovery pipe (53).

10. A multi-material selective powder-selective sintered 3D printing device according to claim 4, characterized in that the resin injection module (3), the powder-placement module (4) and the powder recovery module (5) are displaced relative to the base plate (1) by a first guide drive; the milling module (2) is displaced relative to the base plate (1) by means of a second guide drive.