CN112387984B

CN112387984B - Post-treatment device and method for residual powder of 3D printing porous structure

Info

Publication number: CN112387984B
Application number: CN202011181248.4A
Authority: CN
Inventors: 王宏卫; 万熠; 于明志; 张晓�; 林贵梅
Original assignee: Shandong University
Current assignee: Shandong University
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2022-04-08
Anticipated expiration: 2040-10-29
Also published as: CN112387984A

Abstract

The invention discloses a device and a method for post-processing residual powder with a 3D printing porous structure, wherein the technical scheme is as follows: comprises at least one pipe channel, the pipe channel is arranged above the fixing device through a clamping device, and the clamping device can rotate relative to the fixing device; the inner side of the tube channel is provided with a flexible fixing piece for fixing the porous structure. According to the invention, the porous structure is subjected to post-treatment by adopting a directional flow acid etching method, and the residual powder on the surface of the porous structure can be uniformly removed while the original mechanical property of the porous structure is kept.

Description

Post-treatment device and method for residual powder of 3D printing porous structure

Technical Field

The invention relates to the field of post-processing of 3D printing structures, in particular to a post-processing device and a post-processing method for residual powder of a 3D printing porous structure.

Background

The 3D printing technology is a manufacturing method for obtaining a final structure by dividing a three-dimensional entity into two-dimensional sheets and stacking the sheets layer by layer, and has the advantages of personalized customization, rapid forming, complex shape processing and the like. The printing materials commonly used in the market at present mainly comprise inorganic non-metallic materials, high polymer materials and metal materials, particularly 3D printing of metal materials, and because the printing materials can provide good mechanical properties, the printing materials have been applied to the fields of aerospace, medical treatment and the like at present and have wide application prospects in the future.

For example, titanium alloy has good mechanical properties, corrosion resistance and biocompatibility, and is widely applied to the fields of aerospace and biomedical science at present. The titanium alloy 3D printing technology can realize the processing of a complex porous structure, the lightweight manufacturing of the structure and the integrated molding of the complex structure in the aerospace field, and can provide a better heat dissipation effect; in the field of biological medical treatment, the artificial prosthesis can be manufactured by 3D printing of the titanium alloy, and the manufactured prosthesis has the advantages of low rigidity, individuation, good connectivity and the like.

At present, a 3D printing method of a porous titanium alloy mainly includes Selective laser cladding (SLM) and electron Beam Melting deposition (EBM), and mainly includes a material additive manufacturing technology for constructing a three-dimensional structure by Melting metal powder layer by layer with a high-energy laser Beam or an electron Beam, and both the two technologies can construct a porous titanium alloy structure with high mechanical strength, but meanwhile, a large amount of unmelted residual powder and titanium powder particles partially melted and adhered to the surface exist on the surface of the porous structure processed by the two technologies, the residual powder and the partially adhered titanium powder are very easy to fall off in the long-term service process of the titanium alloy structure, serious accidents are easily caused in the aerospace and medical fields, and in the aspect of 3D printing of the clinical application of the porous prosthesis, the fallen titanium powder particles cause complications such as inflammation, and the like, so that the operation fails. The titanium alloy with the large pores and the simple structure can remove titanium powder particles on the surface through traditional sand blasting, acid etching and the like, but in a part of titanium alloy with small pores and a complex porous structure, the traditional ultrasonic cleaning, sand blasting and the like are difficult to clean residual powder and adhesion titanium powder inside the porous structure, the common acid etching is difficult to realize uniform acid etching operation inside and outside the porous structure, the phenomenon that the external acid etching is excessive and the internal acid etching is too light is easy to occur, and the mechanical property of the whole structure is influenced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a device and a method for post-treating residual powder in a 3D printing porous structure.

In order to achieve the purpose, the invention is realized by the following technical scheme:

in a first aspect, embodiments of the present invention provide a 3D printing porous structure residual powder post-processing device, comprising at least one tube channel, the tube channel being mounted above a fixture by a clamping device, and the clamping device being rotatable relative to the fixture; the inner side of the tube channel is provided with a flexible fixing piece for fixing the porous structure.

As a further realisation, where the tube passage is one, the flexible fixing is fixed inside the tube passage; when the tube channels are plural, flexible fixtures are connected between adjacent tube channels.

As a further implementation mode, a through hole is formed in the center of the flexible fixing piece, and the outer side of the flexible fixing piece is attached to the inner wall of the pipe channel.

As a further implementation, a first tube channel and a second tube channel are included, the first tube channel and the second tube channel being disposed opposite each other, the first tube channel being connected to a first flexible fixture and the second tube channel being connected to a second flexible fixture; the first flexible fixing piece and the second flexible fixing piece are spaced by a set distance and used for installing a local porous structure; the first and second tube lanes are mounted above a fixture by a clamping device.

As a further implementation mode, through holes are respectively formed in the centers of the first flexible fixing piece and the second flexible fixing piece, the outer side of the first flexible fixing piece is attached to the inner wall of the first pipe channel, and the outer side of the second flexible fixing piece is attached to the inner wall of the second pipe channel.

As a further implementation mode, the fixing device comprises a fixing table and a supporting rod vertically fixed with the fixing table, and the fixing table is used for placing the container.

As a further implementation manner, the clamping device comprises a connecting rod group and a clamping piece, one end of the connecting rod group is connected with the supporting rod, and the other end of the connecting rod group is connected with the clamping piece.

In a third aspect, an embodiment of the present invention further provides a post-processing method for residual powder in a 3D printing porous structure, where the post-processing method is adopted, and the post-processing method includes:

preparing an acid etching solution and manufacturing a flexible fixing piece;

placing the porous structure in a flexible fixture and securing the flexible fixture to the tube passage, securing the tube passage with a clamping device; placing a container on the fixture;

adding an acid solution into the tube channel for a set time of acid etching;

and carrying out ultrasonic cleaning on the porous structure.

In a fourth aspect, an embodiment of the present invention further provides a post-processing method for residual powder in a 3D printing porous structure, where the post-processing method is adopted, and the post-processing method includes:

preparing an acid etching solution, and manufacturing a first flexible fixing piece and a second flexible fixing piece;

placing the partially porous structure between the first flexible fixture and the second flexible fixture, connecting the first flexible fixture to the first tube pathway, and connecting the second flexible fixture to the second tube pathway;

fixing the first tube passage and the second tube passage by using a clamping device, and placing a container on the fixing device;

adding an acid solution from above the first tube channel, and acid etching for a set time;

and carrying out ultrasonic cleaning on the local porous structure.

As a further implementation, after the acid etching is set for a set time, the clamping device may be turned over by 180 ° and the acid etching is continued for the set time.

The beneficial effects of the above-mentioned embodiment of the present invention are as follows:

(1) according to one or more embodiments of the invention, directional flow acid etching is realized through the pipe channel, so that residual powder inside and outside the porous structure can be uniformly removed while the original mechanical property of the 3D printing porous structure is ensured, and the danger of powder falling off in the later use of the porous structure is avoided;

(2) one or more embodiments of the device of the invention have simple structure, low cost and easy installation, and can be customized according to different porous structures and local porous structure shapes so as to realize the post-treatment of different porous structures.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is a schematic view of a flexible mount assembly according to a first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 4(a) is a schematic view of a tube channel configuration of hourglass shape;

FIG. 4(b) is a schematic diagram of a four-way structure;

FIG. 5 is a schematic diagram of a flexible fastener mold construction according to one or more embodiments of the invention;

FIG. 6(a) is a schematic top mold structure according to one or more embodiments of the present invention;

FIG. 6(b) is a schematic view of a lower mold structure according to one or more embodiments of the present invention;

FIG. 7 is a schematic view of a porous structure test piece according to one or more embodiments of the present disclosure;

FIG. 8 is a schematic structural diagram of a fourth embodiment of the present invention;

FIG. 9(a) is a schematic view of a first flexible fastener construction according to a fourth embodiment of the invention;

FIG. 9(b) is a schematic view of a second flexible fastener construction according to a fourth embodiment of the invention;

FIG. 10 is a schematic view of a partial porous structure test piece according to one or more embodiments of the present disclosure;

FIG. 11 is an SEM picture of a 3D printed porous titanium alloy test piece and after being processed by a post-processing method;

the device comprises a fixing table 1, a fixing table 2, a clamping piece 3, a pipe passage 4, a container 5, a flexible fixing piece 6, a porous structure 7, an upper die 8, a lower die 9, a first pipe passage 10, a second pipe passage 11, a first flexible fixing piece 12, a second flexible fixing piece 13, a local porous structure 14, a connecting rod 15, a supporting rod 16, a third pipe passage 17, a fourth pipe passage 18 and a connecting rod group.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

for convenience of description, the words "up", "down", "left" and "right" in this application, if any, merely indicate correspondence with the directions of up, down, left and right of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, and do not 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 construed as limiting the application. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The terms "mounted", "connected", "fixed", and the like in the present application should be understood broadly, and for example, the terms "mounted", "connected", and "fixed" may be fixedly connected, detachably connected, or integrated; the two components can be connected directly or indirectly through an intermediate medium, or the two components can be connected internally or in an interaction relationship, and the terms can be understood by those skilled in the art according to specific situations.

The first embodiment is as follows:

the embodiment provides a 3D prints remaining powder aftertreatment device of porous structure, as shown in fig. 1, including fixing device, clamping device, pipeline passageway 3, flexible mounting 5, pipeline passageway 3 passes through clamping device to be installed in the fixing device top, and flexible mounting 5 sets up inside pipeline passageway 3.

Specifically, the fixing device comprises a fixing table 1 and a support rod 15, wherein the fixing table 1 is used for placing a container 4, and the container 4 is used for receiving the acid etching solution flowing through the upper porous structure 6. The porous structure 6 can be a 3D printing porous artificial prosthesis, such as an intervertebral fusion device, a bone prosthesis, a tibia titanium alloy structure and the like, and can also be a porous component processed in aerospace or other fields.

The support rod 15 is vertically fixed above the fixed table 1, and in order to ensure that the fixed table 1 has a larger placing space, the support rod 15 is installed at one end of the fixed table 1. The clamping device is vertically fixed with the support rod 15 and is parallel to the fixed platform 1.

Further, the clamping device comprises a clamping piece 2 and a connecting rod 14, one end of the connecting rod 14 is connected with the top end of the supporting rod 15, and the other end of the connecting rod is connected with the clamping piece 2; the clamping member 2 is used to fix the pipe passage 3. The connecting rod 14 can rotate relative to the supporting rod 15 to realize the turning of the pipe channel 3, and the pipe channel 3 realizes the acid etching in the positive and negative directions through the turning.

In this embodiment, the top end of the support rod 15 is provided with a hole for the connection rod 14 to pass through, the connection rod 14 passes through the hole, and the connection rod 14 and the hole can adopt clearance fit. In order to ensure a stable support of the clamping device and the pipe channel 3 by the support bar 15, the connecting bar 14 can be fastened to the support bar 15 after passing through the hole by means of fastening elements, such as clips, bolts, etc.

The shape of the clamping piece 2 is adapted to the pipe channel 3, and when the pipe channel 3 is a circular pipe, the clamping piece 2 is a circular ring; when the tube passage 3 is a square tube, the inner surface of the holder 2 is square. Of course, the tube channel 3 can also have other shapes, and the structure of the clamping element 2 can be adapted accordingly.

The pipe channel 3 is clamped by the clamping piece 2 and has a certain distance with the upper surface of the fixed table 1; and the axis of the tube lane 3 is perpendicular to the stationary table 1. As shown in fig. 2, the flexible fixing member 5 is fixed inside the tube passage 3, the outer wall of the flexible fixing member 5 is fitted to the inner wall of the tube passage 3, and the shape of the outer edge thereof is adapted to the shape of the inner wall of the tube passage 3; the center of the flexible fixing part 5 is provided with a through hole which is matched with the porous structure 6 in shape.

The flexible fixing member 5 is made of a flexible material through a mold, and in the embodiment, the flexible fixing member 5 is made of a silica gel material; it will be appreciated that in other embodiments, the flexible mount 5 may be other flexible materials that do not react with the acid.

As shown in fig. 5, the mold for manufacturing the flexible fixing member 5 includes an upper mold 7 and a lower mold 8, and the upper mold 7 and the lower mold 8 may be obtained by Fused Deposition Modeling (FDM) or light curing technology; as shown in fig. 6(b), the lower mold 8 has a protrusion in the middle, and the shape of the protrusion is consistent with the shape of the through hole in the center of the flexible fixing member 5; as shown in fig. 6(a), the upper die 7 has a shape conforming to the shape of the tube passage 3; the space between the upper mold 7 and the lower mold 8 is filled with a flexible material to make the flexible fixing member 5.

The tube channel 3 may be cylindrical, hourglass shaped with narrow middle portions and wide ends as shown in fig. 4(a), three-way, four-way as shown in fig. 4(b), or other shaped structures, which may be selected according to the shape of the porous structure. The acid solution flows in a single direction when the pipe channel 3 is cylindrical and hourglass-shaped; when the pipe passage 3 is a tee joint or a cross joint, the acid solution flows in multiple directions. When different tube passage 3 structures are selected, the corresponding flexible fixing member 5 is also adapted, and the flexible fixing member 5 ensures that the porous structure 6 is communicated with the passage opening of the tube passage 3, thereby ensuring the flow of the etching solution.

The tube passage 3 may be one or more, and the tube passage 3 of this embodiment is of an integral structure. The tube channel 3 is made of a hard material, in this embodiment the tube channel 3 is made of silicon dioxide, but in other embodiments the tube channel 3 may be made of other hard materials which do not react with acid.

When the embodiment is used, firstly, an acid etching solution with a proper concentration volume is prepared, and the acid solution comprises one or more of nitric acid, hydrochloric acid, hydrofluoric acid and the like; manufacturing a flexible fixing piece 5 according to the shape of a porous structure (such as a porous titanium alloy structure) and the diameter of the used pipe channel 3, and fixing the relative position of the porous titanium alloy structure and the pipe channel 3 by using the flexible fixing piece 5; fixing the tube channel 3 and the porous titanium alloy structure above the fixing table 1 through a clamping device, adding an acid solution into the tube channel 3 and flowing through the flexible fixing piece 5 to acid-etch the porous titanium alloy structure, and finishing the post-treatment process.

Example two:

the embodiment provides a 3D prints remaining powder post processing apparatus of porous structure, as shown in fig. 3, including fixing device, clamping device, third pipe passageway 16, fourth pipe passageway 17, flexible mounting 5, third pipe passageway 16, fourth pipe passageway 17 pass through clamping device and install in the fixing device top, and flexible mounting 5 sets up between third pipe passageway 16, fourth pipe passageway 17.

This embodiment uses two tube channels, a third tube channel 16 and a fourth tube channel 17, with the flexible fixture 5 being snapped into engagement with the third tube channel 16 at one end and the fourth tube channel 17 at the other end.

The clamping device comprises a connecting rod group 18 and two clamping pieces 2, and the two clamping pieces 2 are respectively sleeved outside the third pipe channel 16 and the fourth pipe channel 17 in order to respectively clamp the third pipe channel 16 and the fourth pipe channel 17. Connecting rod group 18 rotates with bracing piece 15 to be connected, and connecting rod group 18 includes the first horizontal pole of being connected with bracing piece 15, and first horizontal pole passes through the montant and links to each other with the second horizontal pole that two intervals set up, and holder 2 is connected to the second horizontal pole.

Other structures are the same as those of the first embodiment, and are not described herein again.

Example three:

the embodiment provides a 3D printing porous structure residual powder post-treatment device, which is suitable for a local porous structure 13 shown in figure 10 and comprises a fixing device, a clamping device, a first pipe channel 9, a second pipe channel 10, a first flexible fixing part 11 and a second flexible fixing part 12, wherein the first pipe channel 9 and the second pipe channel 10 are arranged above the fixing device through the clamping device as shown in figure 8; the first tube passage 9 is secured to a first flexible fixture 11 and the second tube passage 10 is secured to a first flexible fixture 12; the first flexible fixing member 11 and the first flexible fixing member 12 are spaced apart by a set distance for placing the partially porous structure 13.

As shown in fig. 9(a) and 9(b), the centers of the first flexible fixing member 11 and the first flexible fixing member 12 are provided with through holes, and the shapes of the through holes are adapted to the local porous structure 13. The outer edge of the first flexible fixing member 11 is shaped to conform to the shape of the inner wall of the first tube passage 9, and the outer edge of the first flexible fixing member 12 is shaped to conform to the shape of the inner wall of the second tube passage 10.

Other structures are the same as those of the embodiment and are not described herein again.

Example four:

the embodiment provides a post-treatment method for residual powder of a 3D printing porous structure, which comprises the following steps:

(1) preparing acid etching solution, wherein the acid etching solution can be single solution or mixture of multiple solutions of inorganic acid solutions such as nitric acid, hydrochloric acid, hydrofluoric acid and the like. Preferably, the acid etching solution is a mixed solution of nitric acid, hydrofluoric acid and water, and the volume ratio of the nitric acid to the hydrofluoric acid to the water is 20: 2: 78.

(2) the flexible fixing piece is manufactured according to the porous structure and the size of the tube channel, further, the mould of the flexible fixing piece is manufactured according to the diameter of the tube channel and the shape of the porous structure, the mould can be obtained by utilizing FDM or light curing technology, and the flexible fixing piece used for post-processing of the porous structure is obtained by utilizing the mould.

The flexible fixing member can be designed into one or more than one, and all porous structure parts can be ensured to be flowed through by the acid etching solution.

(3) Fixing the relative position of the porous structure and the tube channel by using a flexible fixing piece, fixing the tube channel above a fixing table by using a clamping device, adding an acid solution into the tube channel and flowing through the flexible fixing piece, acid-etching the porous structure, controlling the acid-etching time by controlling the time for the acid-etching solution to flow through the porous structure, and placing a container at the lower part of the tube channel to receive the acid-etching solution left at the upper part.

The acid solution can be used for one time or multiple times, the acid etching time is adjusted according to the proportion of the acid etching solution, and preferably, the acid etching time is 0.5-10 min.

(4) And after the acid etching is finished, carrying out ultrasonic cleaning on the porous structure.

Example five:

in this embodiment, the porous titanium alloy structure shown in fig. 7 is printed by using the SLM technique, the diameter of the titanium powder is 10 to 60 μm, and the 3D printing process parameters are as follows: the laser power is 145W, the spot diameter is 60 μm, the scanning speed is 1000mm/s, the scanning layer thickness is 30 μm, the scanning interval is 75 μm, the oxygen content of the working chamber is less than 0.1 wt%, and argon gas is used as protective gas.

In this embodiment, the surface morphology of the 3D printed porous titanium alloy structure is observed with a scanning electron microscope.

The post-processing method for the 3D printing porous titanium alloy structure comprises the following specific steps:

(1) a cubic porous titanium alloy structure with dimensions of 10 × 10 × 12mm and a unit cell size of 1 × 1 × 1mm was 3D printed, and the test piece was cut from the substrate and subjected to ultrasonic cleaning.

(2) Preparing 1000ml of hydrofluoric acid and nitric acid mixed solution as an acid etching solution, wherein the ratio of nitric acid: hydrofluoric acid: 20 parts of water: 2: 78.

(3) the flexible fixing piece is made of mold silica gel, an upper mold and a lower mold of the flexible fixing piece are manufactured by utilizing a photocuring technology, liquid mold silica gel is added into the upper mold and the lower mold, and the flexible fixing piece is taken out after 12 hours.

(4) The porous titanium alloy structure is fixed in a pipe channel by using a flexible fixing piece, the pipe channel is vertically fixed on a fixing table, acid etching solution is poured into the upper part of the pipe channel, a container is placed at the lower part of the pipe channel to receive the acid etching solution left by the upper part, and the acid etching time is controlled to be 60 s.

(5) And after the acid etching is finished, replacing the lower container, pouring deionized water into the upper part of the pipe passage to preliminarily clean the test piece, and then taking down the porous titanium alloy structure for ultrasonic cleaning.

(6) And observing the internal surface appearance of the porous titanium alloy structure by using a scanning electron microscope.

As shown in fig. 11, compared with an untreated test piece, after the post-treatment is completed, residual titanium powder particles outside and inside the porous titanium alloy structure are uniformly and completely removed, and the printing structure is closer to the design structure.

Example six:

in this embodiment, the post-processing method described in the fourth embodiment is used to process a 3D printed porous titanium alloy structure, and the specific steps are as follows:

(1)3D printing a cubic porous titanium alloy structure with the size of 10 multiplied by 12mm and the unit cell size of 1 multiplied by 1mm, cutting the porous titanium alloy structure from a substrate and carrying out ultrasonic cleaning.

(3) the flexible fixing piece is made of mold silica gel, an upper mold and a lower mold of the flexible fixing piece are manufactured by utilizing a photocuring technology, liquid medical mold silica gel is added into the upper mold and the lower mold, and the flexible fixing piece is taken out after 12 hours.

(4) The porous titanium alloy structure is fixed in a pipe channel by using a flexible fixing piece, the pipe channel is vertically fixed on a fixing table, acid etching solution is poured into the upper part of the pipe channel, a container for placing the lower part of the pipe channel receives the acid etching solution left on the upper part, the container for placing the lower part of the pipe channel receives the acid etching solution left on the upper part, after the acid etching time reaches 30S, the pipe channel is turned over by 180 degrees, the acid etching solution is added from the lower part of the original pipe channel, the acid etching solution flows out from the upper part of the original pipe channel, and the acid etching is continued for 30S.

(5) After the acid etching is finished, the lower container is replaced, deionized water is poured into the upper part of the pipe passage to preliminarily clean the test piece, and then the test piece is taken down to be subjected to ultrasonic cleaning.

Example seven:

in this embodiment, the post-processing method described in the fourth embodiment is used to process a 3D printed porous structure test piece, and the post-processing device described in the third embodiment is used, and the specific steps are as follows:

(1) and 3D printing a local porous titanium alloy structure, cutting the local porous titanium alloy structure from the substrate and carrying out ultrasonic cleaning.

(3) the flexible fixing piece is made of mold silica gel, the mold of the flexible fixing piece is manufactured by utilizing a photocuring technology, the liquid medical mold silica gel is led into the mold, and after 12 hours, the flexible fixing piece is taken out.

(4) Tightly connecting the upper part of a first flexible fixing piece with a first pipe channel, tightly fixing the lower part of the first flexible fixing piece above a local porous titanium alloy structure, tightly connecting the lower part of the local porous titanium alloy structure with the upper part of a second flexible fixing piece, connecting the lower part of the second flexible fixing piece with a second pipe channel, and vertically fixing the first pipe channel and the second pipe channel above a fixing table;

pouring the acid etching solution into the first pipe passage, placing a container below the second pipe passage to receive the acid etching solution left on the upper part, turning the first pipe passage, the first flexible fixing piece and the local porous titanium alloy structure by 180 degrees after the acid etching time reaches 30 seconds, turning the second flexible fixing piece and the second pipe passage by 180 degrees together, and continuing the acid etching for 30 seconds.

(5) After the acid etching is finished, the lower container is replaced, deionized water is poured into the first pipe passage to preliminarily clean the test piece, and then the test piece is taken down to be subjected to ultrasonic cleaning.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A3D printing porous structure residual powder post-treatment device is characterized by comprising at least one pipe channel, wherein the pipe channel is arranged above a fixing device through a clamping device, the clamping device can rotate relative to the fixing device to realize the overturning of the pipe channel, and the pipe channel realizes the acid etching in the positive and negative directions through the overturning; the pipe passageway inboard is equipped with the flexible mounting that is used for fixed porous structure, the through-hole has been seted up at the center of flexible mounting, the outside and the laminating of pipe passageway inner wall of flexible mounting.

2. The 3D printing porous structure residual powder post-processing device according to claim 1, characterized in that when the tube channel is one, the flexible fixing piece is fixed inside the tube channel; when the tube channels are plural, flexible fixtures are connected between adjacent tube channels.

3. The device for post-processing the residual powder in the porous structure by 3D printing is characterized by comprising a first pipe channel and a second pipe channel which are oppositely arranged, wherein the first pipe channel is connected with a first flexible fixing piece, and the second pipe channel is connected with a second flexible fixing piece; the first flexible fixing piece and the second flexible fixing piece are spaced by a set distance and used for installing a local porous structure; first pipe passageway and second pipe passageway pass through clamping device and install in fixing device top, and clamping device can be rotatory relatively fixing device to realize the upset of first pipe passageway and second pipe passageway, first pipe passageway and second pipe passageway realize the acid etching of two positive and negative directions through the upset, the through-hole is seted up respectively to the center of first flexible mounting, second flexible mounting, the laminating of first pipe passageway inner wall in the outside and the flexible mounting of second, the laminating of second pipe passageway inner wall in the second flexible mounting outside.

4. The 3D printing porous structure residual powder post-processing device according to claim 1 or 3, wherein the fixing device comprises a fixing table and a support rod vertically fixed with the fixing table, and the fixing table is used for placing a container.

5. The 3D printing porous structure residual powder post-processing device according to claim 4, wherein the clamping device comprises a connecting rod group and a clamping piece, one end of the connecting rod group is connected with the supporting rod, and the other end of the connecting rod group is connected with the clamping piece.

6. A 3D printing porous structure residual powder post-processing method, characterized in that the post-processing device according to claim 1 is used, comprising:

preparing an acid etching solution and manufacturing a flexible fixing piece;

adding an acid solution into the tube channel for a set time of acid etching;

and carrying out ultrasonic cleaning on the porous structure.

7. A3D printing porous structure residual powder post-processing method is characterized in that the post-processing device according to claim 3 is adopted, and the method comprises the following steps:

and carrying out ultrasonic cleaning on the local porous structure.

8. The 3D printing porous structure residual powder post-processing method according to claim 6 or 7, characterized in that after the acid etching is set for a time, the clamping device is turned over by 180 degrees.