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Sintering process capable of reducing surface discoloration of metal injection molding product

An injection molding and product technology that is used in metal processing equipment, transportation and packaging to solve problems such as surface discoloration

Pending Publication Date: 2021-05-18
SHENZHEN SHINDY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main material of MIM is stainless steel, and the product is prone to surface discoloration due to oxidation, pollution and other reasons during the sintering process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The following technical solutions provided by the invention:

[0026] A sintering process capable of improving surface discoloration of metal injection molding products, comprising the following steps:

[0027] S1. The raw materials are fully mixed and kneaded;

[0028] S2. Extrude, pelletize, and cool the block mixture obtained by mixing in S1 to prepare 316L feed pellets;

[0029] S3, making the feed granules prepared in S2 into a sample blank through an injection molding process;

[0030] S4, carrying out nitric acid catalytic degreasing treatment to the sample blank prepared in S3;

[0031] S5, heat up and heat-insulate the degreased sample base in S4;

[0032] S6. Carry out vacuum sintering treatment on the sample body after heat preservation in S5, then perform partial pressure cleaning treatment, then perform partial pressure sintering treatment, and finally cool down to room temperature and finally complete product sintering.

[0033] As the preferred techni...

Embodiment 2

[0042] The following technical solutions provided by the invention:

[0043] A sintering process capable of improving surface discoloration of metal injection molding products, comprising the following steps:

[0044] S1. The raw materials are fully mixed and kneaded;

[0045] S2. Extrude, pelletize, and cool the block mixture obtained by mixing in S1 to prepare 316L feed pellets;

[0046] S3, making the feed granules prepared in S2 into a sample blank through an injection molding process;

[0047] S4, carrying out nitric acid catalytic degreasing treatment to the sample blank prepared in S3;

[0048] S5, heat up and heat-insulate the degreased sample base in S4;

[0049] S6. Carry out vacuum sintering treatment on the sample body after heat preservation in S5, then perform partial pressure cleaning treatment, then perform partial pressure sintering treatment, and finally cool down to room temperature and finally complete product sintering.

[0050] As the preferred techni...

Embodiment 3

[0059] The following technical solutions provided by the invention:

[0060] A sintering process capable of improving surface discoloration of metal injection molding products, comprising the following steps:

[0061] S1. The raw materials are fully mixed and kneaded;

[0062] S2. Extrude, pelletize, and cool the block mixture obtained by mixing in S1 to prepare 316L feed pellets;

[0063] S3, making the feed granules prepared in S2 into a sample blank through an injection molding process;

[0064] S4, carrying out nitric acid catalytic degreasing treatment to the sample blank prepared in S3;

[0065] S5, heat up and heat-insulate the degreased sample base in S4;

[0066] S6. Carry out vacuum sintering treatment on the sample body after heat preservation in S5, then perform partial pressure cleaning treatment, then perform partial pressure sintering treatment, and finally cool down to room temperature and finally complete product sintering.

[0067] As the preferred techni...

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PUM

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Abstract

The invention relates to the technical field of stainless steel sintering, in particular to a sintering process capable of reducing surface discoloration of a metal injection molding product. The sintering process comprises the following steps: S1, fully blending and mixing raw materials; S2, extruding, pelletizing and cooling a blocky mixture prepared by mixing in the S1, so as to prepare 316L feeding particles; S3, preparing the feeding particles prepared in the S2 into a sample blank through an injection molding process; S4, performing nitric acid catalytic degreasing treatment on the sample blank prepared in S3; S5, subjecting the degreased sample blank in the step S4 to heating and heat preservation treatment; and S6, carrying out vacuum sintering treatment on the sample blank subjected to heat preservation in S5, then carrying out partial pressure cleaning treatment, then carrying out partial pressure sintering treatment, finally cooling to room temperature, and finally completing product sintering. According to the process, the fluidity of powder can be enhanced, so that the powder can be mixed more uniformly; and in the sintering negative pressure degreasing stage, a binder can be effectively removed by adopting the heating rate of 1 DEG C / min.

Description

technical field [0001] The invention relates to the technical field of stainless steel sintering, in particular to a sintering process capable of improving surface discoloration of metal injection molding products. Background technique [0002] Metal Injection Molding (MIM for short) is a new type of powder metallurgy near-net forming technology derived from the plastic injection molding industry. The basic process steps of metal injection molding are: first, select the metal powder that meets the requirements of MIM and Binder, and then use appropriate method to mix the powder and binder at a certain temperature to form a uniform feed, after granulation, injection molding, the obtained formed body is sintered and densified after degreasing treatment to become the final product. At present, the main material of MIM is stainless steel, and the product is prone to surface discoloration due to oxidation, pollution and other reasons during the sintering process. In view of this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/22B22F3/10
CPCB22F3/225B22F3/10B22F1/102
Inventor 李继坪
Owner SHENZHEN SHINDY TECH
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