Preparation method of high-precision stainless steel product

A stainless steel, high-precision technology, applied in the field of stainless steel manufacturing, can solve problems such as large shrinkage rate and imperfect design of binder system, and achieve the effects of reducing adhesion, excellent shape retention performance, and improving compatibility

Inactive Publication Date: 2018-03-13
WUHE HUANGHUAI GRAIN & OIL MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, MIM technology still has the technical problems of imperfect design of the binder system and large shrinkage during the sintering process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for preparing high-precision stainless steel products, comprising the following steps:

[0018] S1: Stainless steel powder treatment

[0019] After mixing stainless steel powder and tungsten carbide powder according to the ratio of 100:1, use a ball mill to mix for 30 minutes to prepare stainless steel mixed powder;

[0020] S2: Binder Preparation

[0021] In parts by weight, mix 90 parts of acrylate monomer, 7 parts of polyethylene glycol, and 1 part of tributyl borate evenly, then heat to 70°C in a water bath, and then add 40 parts of vinyl fluoride and 4 parts of initiator , after stirring evenly, after insulated for 2 hours, it was lowered to room temperature, and 14 parts of hydrogenated polydecene were added thereto to obtain a binding agent;

[0022] S3: injection molding

[0023] The stainless steel mixed powder and binder prepared above are mixed according to the weight ratio of 3:1, injection molding is carried out by powder injection machine, afte...

Embodiment 2

[0028] A method for preparing high-precision stainless steel products, comprising the following steps:

[0029] S1: Stainless steel powder treatment

[0030] After mixing stainless steel powder and tungsten carbide powder according to the ratio of 110:1, use a ball mill to mix for 35 minutes to prepare stainless steel mixed powder;

[0031] S2: Binder preparation

[0032] In parts by weight, mix 110 parts of acrylate monomer, 8 parts of polyethylene glycol, and 2 parts of tributyl borate evenly, then heat to 75°C in a water bath, and then add 45 parts of vinyl fluoride and 6 parts of initiator , after stirring evenly, after insulated for 2.5 hours, it was lowered to room temperature, and 16 parts of hydrogenated polydecene were added thereto to obtain a binder;

[0033] S3: injection molding

[0034] The stainless steel mixed powder and binder prepared above are mixed according to the weight ratio of 4:1, and injection molding is carried out by using a powder injection mach...

Embodiment 3

[0039] A method for preparing high-precision stainless steel products, comprising the following steps:

[0040] S1: Stainless steel powder treatment

[0041] After mixing stainless steel powder and tungsten carbide powder according to the ratio of 120:1, use a ball mill to mix for 40 minutes to prepare stainless steel mixed powder;

[0042] S2: Binder preparation

[0043] In parts by weight, mix 120 parts of acrylate monomer, 9 parts of polyethylene glycol, and 4 parts of tributyl borate evenly, heat to 80°C in a water bath, and then add 50 parts of vinyl fluoride and 7 parts of initiator , after stirring evenly, after insulated for 3 hours, it was lowered to room temperature, and 20 parts of hydrogenated polydecene were added thereto to obtain a binder;

[0044] S3: injection molding

[0045] The stainless steel mixed powder and binder prepared above are mixed according to the weight ratio of 5:1, injection molding is carried out by powder injection machine, after degreasi...

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PUM

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Abstract

The invention discloses a preparation method of high-precision stainless steel products, which comprises the following steps: after mixing stainless steel powder and tungsten carbide powder according to the ratio of 100-120:1, the mixture is mixed by a ball mill for 30-40 minutes to prepare stainless steel mixed powder; Binder preparation: mix the stainless steel mixed powder and binder prepared above according to the weight ratio of 3-5:1, use powder injection machine for injection molding, after degreasing treatment with warm water at 40-50°C, carry out High temperature sintering to produce finished products. The stainless high-quality products prepared by the invention not only have high precision and good integrity, but also have excellent mechanical properties, which greatly improves the quality of stainless steel products.

Description

technical field [0001] The invention belongs to the technical field of stainless steel manufacturing, and in particular relates to a preparation method of high-precision stainless steel products. Background technique [0002] Metal Injection Molding (MIM) is a high-tech produced by combining traditional powder metallurgy technology and plastic injection molding technology. This technology has the following advantages: parts with very complex shapes can be produced; the degree of densification of sintering is high, and the performance is comparable to that of forged materials; High-quality machining; high material utilization rate, suitable for mass production; small investment in equipment, and can automatically control the entire process, high production efficiency. The general metal injection process is as follows: the first step is at the beginning of injection molding, the mold is in the mold opening state, wipe the inside of the mold with a clean cloth, and clean the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22
CPCB22F3/225
Inventor 武献东
Owner WUHE HUANGHUAI GRAIN & OIL MACHINERY CO LTD
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