Device for reducing preparation defects of 3D printing technology through follow-up micro rolling

Abstract

The invention discloses a device for reducing 3D printing technology preparation defects through follow-up micro rolling, and belongs to the technical field of 3D printing, the device comprises a laser, the laser is connected with an electronic telescopic rod through a fastener, the right side of the end of the electronic telescopic rod is provided with a pressing tool through an obliquely arranged connecting frame, and the pressing tool is provided with a main roller; a liquid pipe support is arranged on the left side of the end of the electronic telescopic rod through a support, a cooling liquid pipe which is obliquely distributed is arranged on the liquid pipe support, a liquid outlet of the cooling liquid pipe is located behind the main roller, and a pipe connector of the cooling liquid pipe is connected with an external refrigerating liquid pipe. According to the device for reducing the preparation defects of the 3D printing technology through follow-up micro rolling, the microstructure of a deposition layer can be refined, the surface defects are reduced, and the forming quality and performance are improved.

Description

Technical Field

[0001] The present invention relates to the field of 3D printing technology, and in particular to a device for reducing preparation defects of 3D printing technology by follow-up micro-rolling. Background Art

[0002] Laser energy directional deposition can also be called laser 3D printing technology. It uses a laser beam to melt and solidify metal powder and accumulate it layer by layer to finally prepare three-dimensional parts. In this process, the energy of the laser beam is accurately controlled and directed to achieve precise manufacturing, so it has a wide range of applications in aerospace, medical health, national defense and military fields. However, when preparing high-performance materials, a large number of voids, cracks and columnar crystal coarsening will be generated during the laser 3D printing process, which ultimately reduces the performance of the material. In response to the defects of laser cladding preparation, various scholars have studied various methods and functions of auxiliary laser cladding preparation, such as ultrasonic vibration assisted laser cladding to reduce the generation of pores, steady-state magnetic field assisted laser cladding to inhibit the generation of cracks, and liquid nitrogen cooling to reduce the size of microstructures. The existing auxiliary laser cladding technology has a single effect on reducing the defects of laser cladding preparation, and cannot solve the problems of pores, cracks, and coarse grains at the same time. Based on this, the present invention proposes a device for reducing the preparation defects of 3D printing technology by follow-up micro-rolling. Summary of the invention

[0003] The purpose of the present invention is to provide a device for reducing the preparation defects of 3D printing technology by follow-up micro-rolling, so as to solve the above-mentioned problems.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention discloses a device for reducing preparation defects of 3D printing technology by follow-up micro-rolling, comprising a laser, wherein the laser is connected to an electronic telescopic rod through a fastener, a pressing tool is provided at the right side of the end of the electronic telescopic rod through an inclined connecting frame, and a main roller is provided on the pressing tool; a liquid pipe bracket is provided at the left side of the end of the electronic telescopic rod through a bracket, and an inclined cooling liquid pipe is provided on the liquid pipe bracket, the liquid outlet of the cooling liquid pipe is located behind the main roller, and the pipe joint of the cooling liquid pipe is connected to an external freezing liquid pipe.

[0006] Furthermore, the press has a U-shaped structure, and the main roller is rotatably arranged at an opening of the U-shaped structure of the press by means of stud bolts.

[0007] Furthermore, a first auxiliary wheel and a second auxiliary wheel are symmetrically arranged below the U-shaped structure of the press.

[0008] Furthermore, the auxiliary wheel one and the auxiliary wheel two are respectively arranged on the bottom of the pressing tool by means of a captive bolt one and a captive bolt two.

[0009] Furthermore, the press is fixed to the connecting frame by means of a press screw and a press nut matched therewith, and a gasket is arranged between the press and the connecting frame.

[0010] Furthermore, the projection of the main roller is tangent to the diameter of the laser spot.

[0011] Furthermore, the fastener and the bracket are both connected to the electronic telescopic rod via connecting bolts.

[0012] Furthermore, the bracket and the liquid pipe bracket are connected together through a liquid nitrogen screw.

[0013] Furthermore, the coolant pipe is provided with a liquid pipe nut 1 and a liquid pipe nut 2 which are symmetrically distributed on both sides of the liquid pipe bracket.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are:

[0015] The invention simultaneously micro-rolls and cools the deposited layer while it is in a molten state. It does not target a single defect, but can reduce all defects. On the one hand, it can reduce the generation of voids and thermal stress in the deposited layer, refine the columnar crystals, and prevent the deposited layer from deforming or cracking. On the other hand, due to the reduction in the shrinkage of the material during the cooling process and the micro-rolling of the roller, a smoother and tighter surface effect can be obtained, which can further reduce the generation of surface defects and reduce the surface roughness of the deposited layer. In short, the device for reducing defects in 3D printing preparation technology by follow-up micro-rolling of the present invention can refine the microstructure of the deposited layer, reduce surface defects, and improve forming quality and performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Figure 1 This is a front view of the device for reducing defects in 3D printing technology by follow-up micro-rolling according to the present invention;

[0018] Figure 2 It is the structural diagram of the press installation;

[0019] Figure 3 Installation diagram of the coolant pipe;

[0020] Figure 4 This is a schematic diagram of the press explosion structure;

[0021] Figure 5 This is the exploded diagram of the coolant pipe;

[0022] Figure 6 This is a schematic diagram of the electronic telescopic rod installation structure;

[0023] Figure 7 The projection of the main roller is tangent to the diameter of the light spot;

[0024] Explanation of the reference numerals in the accompanying drawings: 1. electronic telescopic rod; 2. fastener; 3. connecting frame; 4. press; 5. main roller; 6. auxiliary wheel one; 7. auxiliary wheel two; 8. coolant pipe; 9. bracket; 10. liquid pipe bracket; 11. laser; 12. press screw; 13. gasket; 14. press nut; 15. stud bolt; 16. pipe joint; 17. liquid pipe nut one; 18. liquid pipe nut two; 19. liquid nitrogen screw; 20. captive bolt one; 21. captive bolt two; 22. base plate; 23. connecting bolt. DETAILED DESCRIPTION

[0025] like Figure 1-7 As shown, a device for reducing defects in 3D printing technology preparation by follow-up micro-rolling includes a laser 11, and the laser 11 is connected to an electronic telescopic rod 1 through a fastener 2. In this embodiment, the electronic telescopic rod is purchased from the Lida push rod manufacturing factory. This rod contains a silent pure copper motor with a stroke of 10mm-1500mm. The lifting and lowering of the push rod can be controlled by a remote control and can be stopped at any time. A press 4 is installed at the right position of the end of the electronic telescopic rod 1 through an inclined connecting frame 3. A main roller 5 is installed on the press 4. The distance between the main roller 5 and the substrate 22 is adjusted by the thickness of the deposited layer. In this embodiment, the electronic telescopic rod 1 adjusts the distance between the surface of the main roller 5 and the substrate 22 to 3mm-4mm, ensuring that the deposited layer is in a molten state during micro-rolling.

[0026] The press 4 is a U-shaped structure, and the main roller 5 is rotatably installed at the opening of the U-shaped structure of the press 4 through a stud bolt 15. Auxiliary wheel 1 6 and auxiliary wheel 2 7 are symmetrically installed below the U-shaped structure of the press 4. Auxiliary wheel 1 6 and auxiliary wheel 2 7 can respectively perform micro-rolling on the two sides of the deposited layer, which can make the side smoother on one hand, and prevent the molten pool from overflowing to both sides due to the pressure of the main roller 5 on the other hand, thereby affecting the density of the deposited layer. The auxiliary wheel 1 6 and auxiliary wheel 2 7 are respectively installed at the bottom of the press 4 through a captive bolt 1 20 and a captive bolt 21.

[0027] The press 4 is fixed to the connecting frame 3 by means of a press screw 12 and a press nut 14 matched therewith, and a gasket 13 is installed between the press 4 and the connecting frame 3. Specifically, the installation position of the press 4 on the connecting frame 3 is adjusted by means of the press nut 14, so that the projection of the main roller 5 is tangent to the spot diameter of the laser 11.

[0028] A liquid pipe bracket 10 is installed at the left end of the electronic telescopic rod 1 through a bracket 9, and an inclined cooling liquid pipe 8 is installed on the liquid pipe bracket 10. The liquid outlet of the cooling liquid pipe 8 is located behind the main roller 5, and the pipe joint 16 of the cooling liquid pipe 8 is connected to an external freezing liquid pipe. The cooling liquid pipe 8 is installed with a liquid pipe nut 17 and a liquid pipe nut 2 18 symmetrically distributed on both sides of the liquid pipe bracket 10. By adjusting the installation position of the liquid pipe nut 17 and the liquid pipe nut 2 18, the distance between the cooling liquid pipe 8 and the main roller 5 can be adjusted, so that the cooling liquid pipe 8 can follow the roller to cool the roller and indirectly cool the deposited layer.

[0029] The fastener 2 and the bracket 9 are both connected to the electronic telescopic rod 1 via connecting bolts 23 .

[0030] The bracket 9 and the liquid pipe bracket 10 are connected together via a liquid nitrogen screw 19 .

[0031] The method of use of the present invention is as follows:

[0032] Step 1: The electronic telescopic rod 1 adjusts the distance between the surface of the main roller 5 and the substrate 22 to 3mm-4mm to ensure that the deposited layer is in a molten state during micro-rolling;

[0033] Step 2: Adjust the installation position of the press 4 on the connecting frame 3 by using the press nut 14 until the projection of the main roller 5 is tangent to the spot diameter of the laser 11 (such as Figure 7 shown);

[0034] Step 3: Adjust the distance between the cooling liquid pipe 8 and the main roller 5 by adjusting the liquid pipe nut 1 17 and the liquid pipe nut 2 18 so that the cooling liquid pipe 8 closely follows the roller to cool the roller and indirectly cool the deposited layer;

[0035] Step 4: Select appropriate process parameters, such as laser power, scanning speed, spot diameter, etc. for printing;

[0036] Step five, when the deposited layer is in a molten state, the main roller 5, the auxiliary wheel 1 6, and the auxiliary wheel 2 7 perform micro-rolling on three sides (i.e., the upper surface and two side surfaces of the deposited layer), which can reduce the appearance of pores and improve the density of the material. At the same time, the growth direction of the columnar crystals in each deposited layer can be changed during the micro-rolling process to improve the overall performance of the material.

[0037] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for reducing defects in 3D printing technology by follow-up micro-rolling, characterized in that: The invention comprises a laser (11), wherein the laser (11) is connected to an electronic telescopic rod (1) via a fastener (2); a presser (4) is provided at the right side of the end of the electronic telescopic rod (1) via an inclined connecting frame (3); a main roller (5) is provided on the presser (4); a liquid pipe bracket (10) is provided at the left side of the end of the electronic telescopic rod (1) via a bracket (9); a cooling liquid pipe (8) is provided on the liquid pipe bracket (10); a liquid outlet of the cooling liquid pipe (8) is located behind the main roller (5); and a pipe joint (16) of the cooling liquid pipe (8) is connected to an external freezing liquid pipe.

2. The device for reducing 3D printing technology preparation defects by follow-up micro-rolling according to claim 1 is characterized in that: The pressing tool (4) is in a U-shaped structure, and the main roller (5) is rotatably arranged at the opening of the U-shaped structure of the pressing tool (4) via a stud bolt (15).

3. The device for reducing 3D printing technology preparation defects by follow-up micro-rolling according to claim 2 is characterized in that: Auxiliary wheel 1 (6) and auxiliary wheel 2 (7) are symmetrically arranged below the U-shaped structure of the pressing tool (4).

4. The device for reducing 3D printing technology preparation defects by follow-up micro-rolling according to claim 3 is characterized in that: The auxiliary wheel one (6) and the auxiliary wheel two (7) are respectively arranged on the bottom of the pressing tool (4) by means of a captive bolt one (20) and a captive bolt two (21).

5. The device for reducing 3D printing technology preparation defects by follow-up micro-rolling according to claim 1 is characterized in that: The press (4) is fixed on the connecting frame (3) via a press screw (12) and a press nut (14) matched therewith, and a gasket (13) is arranged between the press (4) and the connecting frame (3).

6. The device for reducing 3D printing technology preparation defects by follow-up micro-rolling according to claim 1 is characterized in that: The projection of the main roller (5) is tangent to the spot diameter of the laser (11).

7. The device for reducing 3D printing technology preparation defects by follow-up micro-rolling according to claim 1 is characterized in that: The fastener (2) and the bracket (9) are both connected to the electronic telescopic rod (1) via connecting bolts (23).

8. The device for reducing 3D printing technology preparation defects by follow-up micro-rolling according to claim 1 is characterized in that: The support (9) and the liquid pipe support (10) are connected together via a liquid nitrogen screw (19).

9. The device for reducing 3D printing technology production defects by follow-up micro-rolling according to claim 1 is characterized in that: The cooling liquid pipe (8) is provided with a liquid pipe nut 1 (17) and a liquid pipe nut 2 (18) which are symmetrically distributed on both sides of the liquid pipe bracket (10).

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