Method for preparing miniature mold by powder micro injection forming method

A technology of micro-injection and powder, which is applied in the field of powder metallurgy, can solve the problems of carbon control of high-hardness materials and the difficulty of controlling sintering dimensional accuracy, and achieve the effects of good size adaptability, good wear resistance, and many varieties

Inactive Publication Date: 2012-10-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that high-hardness material powder is used in the powder micro-injection molding process...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] (1) Weigh the mass of each binder component according to the mass percentage ratio (take 100g binder as an example):

[0024] component paraffin High-density polyethylene stearic acid mass (g) 63 27 10

[0025] Mix the three components evenly to make a binder;

[0026] (2) Weigh 1000g of WC-8Co cemented carbide powder and 56.68g of binder according to the powder loading (such as 54%), and mix the powder and binder on the mixer for 1 hour to obtain a uniformly mixed feed;

[0027] (3) Inject the feed material on the injection agent to produce a micro-mold injection blank with the shape of a micro-part. The injection parameters are: injection pressure 90MPa, injection temperature 160°C, holding pressure 60MPa, holding time 1s, mold temperature 60°C;

[0028] (4) Degreasing the micro-mold injection blank in trichlorethylene, the degreasing temperature is 25°C, and the degreasing time is 6-10h;

[0029] (5) Thermally degrease and pre-sinter th...

example 2

[0032] (1) Weigh the mass of each binder component according to the mass percentage ratio (take 100g binder as an example):

[0033] component paraffin High-density polyethylene stearic acid mass (g) 60 30 10

[0034] Mix the three components evenly to make a binder;

[0035] (2) Weigh 500g ZrO according to the powder loading (such as 46%) 2 -3mol%Y 2 o 3 Ceramic powder and 89.29g binding agent are mixed on a mixer for 1.5h to obtain a uniformly mixed feeding material;

[0036] (3) Inject the feed material on the injection agent to produce a micro-mold injection blank with the shape of a micro-part. The injection parameters are: injection pressure 100MPa, injection temperature 150°C, holding pressure 60MPa, holding time 1s, mold temperature 80°C;

[0037] (4) Degreasing the micro-mold injection blank in trichlorethylene, the degreasing temperature is 25°C, and the degreasing time is 4h;

[0038] (5) Thermal degreasing and pre-sintering are...

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Abstract

The invention relates to a method for preparing a miniature mold by a powder micro injection forming method. According to the method, high-hardness material powder and ceryl multi-ingredient bonding agents are adopted and mixed to be prepared into uniform feed, the feed is injected on an injection forming machine to obtain an injection blank of the miniature mold with the shape of a miniature part, the injection blank is subjected to hot degreasing and pre-sintering in a degreasing furnace after the solvent degreasing, finally, a test specimen subjected to the pre-sintering is subjected to high-temperature sintering, and the miniature mold with the good shape maintenance effect is obtained. The method provided by the invention can be used for making the miniature mold with complicated shapes in the micrometer dimension, the mold has the characteristics of high hardness, high wear resistance, low thermal conductivity coefficient and the like, an the mass production requirement of the miniature parts can be perfectly met.

Description

[0001] technical field [0002] The invention relates to the field of powder metallurgy, in particular to a method for preparing micro-molds with complex micron-scale shapes using powder micro-injection molding technology. [0003] Background technique [0004] In the fields of microelectromechanical, communication, optics, chemistry, microfluidics, etc., the demand for micro components is increasing year by year. At present, mainstream micro-manufacturing processes include bulk micromachining, surface micromachining and LIGA technology. In addition, electron sputtering machining (EDM) and substrate-bonded lithography technology are also widely used in the manufacture of MEMS. None of these technologies can meet the size requirements, large-scale production and low-cost requirements at the same time, and powder micro-injection molding provides this possibility. Powder micro-injection molding technology can easily achieve low-cost mass production with the advantages of preci...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F1/00
Inventor 尹海清许慧曲选辉刘烨童锦燕易善杰
Owner UNIV OF SCI & TECH BEIJING
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