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A post-treatment process for the surface of sls parts

A technology of parts and processes, which is applied in the field of SLS parts surface post-treatment technology, can solve the problems of surface roughness, smoothness and coloring that cannot meet the requirements of use, and achieve the effect of improving the optimization rate

Active Publication Date: 2015-12-02
SHENZHEN SUNSHINE LASER & ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a post-treatment process for the surface of SLS parts, which has solved the problem in the prior art that the surface roughness, smoothness and coloring cannot meet the requirements of use after the SLS parts are formed.

Method used

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  • A post-treatment process for the surface of sls parts
  • A post-treatment process for the surface of sls parts
  • A post-treatment process for the surface of sls parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Select the flat plate workpiece P1 obtained by sintering with the SLS rapid prototyping system, and process it according to the following steps:

[0034] S1. Sandblasting: Spray glass sand with a size of 150 mesh (equivalent to 106μm) through a sandblasting machine, and perform sandblasting treatment on the surface of P1 to clean off the powder attached to the surface, and at the same time, impact and grind the burrs on the surface , making it slightly deformed, eliminating the residual stress after processing, and obtaining a workpiece with a roughness of Ra11.39, the effect diagram is as follows figure 2 shown;

[0035] S2. Grinding: For the flat processed part P1 after sandblasting, first use No. 180 sandpaper to polish, and then use No. 360 sandpaper to polish until the surface of the flat processed part P1 feels smooth;

[0036] S3. Spraying resin mixture: mix epoxy resin, EP curing agent, and absolute alcohol in a ratio of 1:1:1, let it stand for 10 minutes, and...

Embodiment 2

[0043] Select the flat plate workpiece P2 sintered by the SLS rapid prototyping system, and process it according to the following steps: Compared with Example 1, steps S1 and S2 are the same, and the initial roughness of P2 is also Ra11.39. The difference in processing is:

[0044] S3. Spraying resin mixture: mix epoxy resin, EP curing agent, and absolute alcohol in a ratio of 1:1:2, let it stand for 15 minutes, and spray the flat plate P2 in a cross method, first along a certain After spraying in the X direction alone, spray in the Y direction perpendicular to the X direction, and then surface dry for 10 minutes. The thickness of the sprayed surface resin layer is 50 μm;

[0045] S4. Grinding: After the plate processing part P2 is dry, polish its surface with No. 360 sandpaper, polish the burrs not covered by the resin layer, and polish the thickness of the surface resin layer to 40 μm. The surface roughness at this time is Ra1.48 , its effect is as follows Figure 4 shown; ...

Embodiment 3

[0050] The difference between the present embodiment and the embodiment 1 is only that the size of the sandblasting material in step S1 is 75 μm. It is proved by experiments that the present embodiment can also obtain substantially the same effect as the embodiment 1.

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Abstract

The invention discloses a post-processing technology for an SLS workpiece surface. The post-processing technology comprises S1, surface abrasive blasting, wherein spraying materials of the size of 75-115 microns are adopted to carry out abrasive blasting processing on the surface of a workpiece; S2, polishing, wherein abrasive paper is used for polishing the surface of the workpiece; S3, resin blending agent spraying, wherein epoxy resin, EP curing agents and anhydrous alcohol are blended according to a ratio of 1:1:1-2, spraying is carried out on the surface of the workpiece, and the thickness of a sprayed resin layer is 50-70 microns; S4, polishing, wherein after the workpiece is dried, the surface of the workpiece is polished through the abrasive paper, and the resin layer is polished to be 35-50 microns thick; S5, polyester paint mixed liquor spraying, wherein after polyester main color paint, curing agents and diluents are blended according to a ratio of 1:0.5-1:1-1.5, spraying is carried out on the workpiece to form a finishing coat layer with a thickness of 40-60 microns. The post-processing technology is adopted to process the nylon SLS workpiece, the surface roughness, surface finish degree and coloring condition of the workpiece can be greatly improved, the strength of the surface of the workpiece is strengthened, and the workpiece is made to meet actual using needs.

Description

technical field [0001] The invention relates to the field of surface treatment, in particular to a surface post-treatment process for SLS parts. Background technique [0002] The selective laser sintering rapid prototyping system - SLS (Selected Laser Sintering), first converts the CAD three-dimensional model into an STL file, slices according to a certain thickness, and obtains the interface profile of the slice. Then control the laser beam to scan the powder of the solid part of the model, so that the powder particles are melted and bonded to each other, and the outline of the layer is gradually obtained. After the scanning of one layer is completed, the workbench is lowered to the cross-sectional height of one layer, and then the next layer is powdered and sintered to finally form a three-dimensional model. [0003] After the SLS parts are formed, there are many pores on the surface, and the surface roughness is about Ra12.5. The roughness, smoothness and coloring of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/24B22F3/105
CPCY02P10/25
Inventor 蔡志祥侯若洪王浩南威
Owner SHENZHEN SUNSHINE LASER & ELECTRONICS TECH CO LTD
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