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Formula system for low-shrinkage-rate stainless steel powder injection molding feedstock and formula system for molding agent thereof

A powder injection molding, low shrinkage technology, used in metal processing equipment, transportation and packaging, etc., can solve problems such as narrow tolerance precision control range, and achieve the effects of improved degreasing efficiency, high melt index, and low expansion coefficient

Inactive Publication Date: 2017-02-22
DONGGUAN HUAJING POWDER METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to increase the stainless steel powder loading of stainless steel powder injection molding feed to ensure excellent product forming ability and solve the narrower control range of powder injection molding products from the size of the formed blank to the size of the sintered blank is the core of powder injection molding technology problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Feed formulation system A includes: 9320.58g stainless steel powder and 679.42g forming agent, wherein the forming agent includes 6.79g stearic acid, 6.79g antioxidant, 33.97g paraffin wax, 47.56g high-density polyethylene, 20.38g polyethylene- Acetate, 33.97g polyethylene wax and 529.96g polyoxymethylene.

example 2

[0028] Feed formulation system B includes 9328.03g stainless steel powder and 671.97g forming agent, wherein forming agent includes 10g stearic acid, 6.72g antioxidant, 26.88g paraffin wax, 33.60g high density polyethylene, 20.16g polyethylene-acetic acid ester, 16.80g polyethylene wax and 557.81g polyoxymethylene.

example 3

[0030] Feed formulation system C includes 9315.78g stainless steel powder and 684.22g forming agent, wherein forming agent includes 8.21g stearic acid, 5.47 antioxidant, 20.53g paraffin wax, 27.37g high density polyethylene, 13.68g polyethylene-acetic acid ester, 13.68g polyethylene wax and 595.28g polyoxymethylene.

[0031] The formula systems A, B, and C of the above-mentioned feed materials were subjected to the following steps: (1) Banburying at 160°C to 200°C for 30min to 90min, extrusion and granulation; (2) Injection molding: at 160°C to 200°C Injection molding at ℃; (3) Degreasing the sample for 3-5 hours in an acidic medium environment at 110-130°C; (4) Keeping warm for 90-180 minutes at 1350-1380°C.

[0032] A standard sample of L100mm*W10mm*δ1~3mm was prepared through the above process conditions, and the shrinkage rate of the material was measured η<︱-11.3475%︱, the shrinkage coefficient of the feed was in the range of 1.125~1.130, and the typical value was 1.1275±...

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Abstract

The invention discloses a formula system for low-shrinkage-rate stainless steel powder injection molding feedstock and a formula system for a molding agent thereof. The formula system for the molding agent of the low-shrinkage-rate stainless steel powder injection molding feedstock comprises stearic acid, an antioxidant, paraffin, high-density polyethylene, polyethylene-acetate, high molecular polymer wax and polyformaldehyde, wherein mass percentage of polyformaldehyde is not greater than 90%. The invention further discloses a formula system for low-shrinkage-rate stainless steel powder injection molding feedstock comprises stainless steel powder and the formula system of the molding agent. The formula system for low-shrinkage-rate stainless steel powder injection molding feedstock and the formula system for the molding agent thereof disclosed by the invention realize relatively high powder loading amount and relatively high shrinkage rate, have relatively high melt index as well as excellent blank strength and molding property, and are especially suitable for manufacturing and molding large-specification thin-wall products.

Description

technical field [0001] The invention relates to the field of powder metallurgy production, in particular to a formulation system of a low-shrinkage stainless steel powder injection molding feedstock and a forming agent thereof. Background technique [0002] With the upgrading of the consumer goods market and the development and progress of the manufacturing industry, the market demand for powder metallurgy products, especially metal powder injection molding products, is increasing. Among them, the demand for large-scale thin-walled and complex-structure powder injection molding products is increasing. bigger and bigger. Due to the system characteristics of powder injection molding technology, a series of complex processing processes are required in the production process of the product, especially in the series of processing processes such as product forming-degreasing-high temperature sintering heat, the product is subjected to heat in the process Factors such as stress, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/22
CPCB22F3/225B22F1/10
Inventor 庞前列吕凝磊张柯
Owner DONGGUAN HUAJING POWDER METALLURGY
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