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1.4435 stainless steel injection molded feedstock and preparation method thereof

An injection molding, stainless steel technology, applied in the field of powder metallurgy, can solve problems affecting product consistency, production processing time, and poor fluidity

Active Publication Date: 2018-11-16
DONGGUAN HUAJING POWDER METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing 1.4435 stainless steel feed has poor fluidity, which affects product consistency and production processing time

Method used

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  • 1.4435 stainless steel injection molded feedstock and preparation method thereof
  • 1.4435 stainless steel injection molded feedstock and preparation method thereof
  • 1.4435 stainless steel injection molded feedstock and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Put 5 kg of 1.4435 stainless steel powder into the mixing chamber of the kneader and preheat it to 180°C-190°C. The specification of the 1.4435 stainless steel powder is 9 microns, and start the kneader to rotate slowly from 4r / min to 6r / min. After the temperature of 1.4435 stainless steel powder is ≥170°C, add 0.5 kg of molding agent (the mass ratio of 1.4435 stainless steel powder to molding agent is about 91:9): 40 grams (8%) of white beeswax, 15 grams of zinc stearate (3 %), 30 grams (6%) of high-density polyethylene, 20 grams (4%) of polypropylene wax, 30 grams (6%) of ethylene-vinyl acetate copolymer, 365 grams (73%) of polyformaldehyde.

Embodiment 2

[0057] Put 4.6 kg of 1.4435 stainless steel powder into the mixing chamber of the kneader and preheat it to 180°C-190°C. The specification of the 1.4435 stainless steel powder is 9 microns. Start the kneader and rotate slowly from 4r / min to 6r / min. After the temperature of 1.4435 stainless steel powder is ≥170°C, add 0.4 kg of molding agent (the mass ratio of 1.4435 stainless steel powder to molding agent is about 92:8): 32 grams (8%) of white beeswax, 12 grams of zinc stearate (3 %), 24 grams (6%) of high-density polyethylene, 16 grams (4%) of polypropylene wax, 24 grams (6%) of ethylene-vinyl acetate copolymer, 292 grams (73%) of polyformaldehyde.

Embodiment 3

[0059] Put 4.6 kg of 1.4435 stainless steel powder into the mixing chamber of the kneader and preheat it to 180°C-190°C. The specification of the 1.4435 stainless steel powder is 9 microns. Start the kneader and rotate slowly from 4r / min to 6r / min. After the temperature of 1.4435 stainless steel powder is ≥170°C, add 0.4 kg of molding agent (the mass ratio of 1.4435 stainless steel powder to molding agent is 92:8): 28 grams (7%) of white beeswax, 8 grams (2% of zinc stearate) ), 20 grams (5%) of high-density polyethylene, 20 grams (5%) of polypropylene wax, 28 grams (7%) of ethylene-vinyl acetate copolymer, 296 grams (74%) of polyoxymethylene.

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Abstract

The invention provides a kind of 1.4435 stainless steel injection molded feedstock and a preparation method thereof. The feedstock comprises a forming agent and 1.4435 stainless steel powder. The massratio of the 1.4435 stainless steel powder to the forming agent is 92:8-90:10. The forming agent comprises, by mass, 7%-9% of high-polymer lubricant, 2%-4% of photo-thermal stabilizing agent, 5%-7% of high-density polyethylene with the molecular weight of 100000-500000, 3%-5% of injection-molding-stage polypropylene wax, 5%-7% of thin-film-grade ethylene-vinyl acetate copolymer and 72%-74% of copolyoxymethylene. The preparation method comprises the steps of feeding the 1.4435 stainless steel powder into a mixing cavity of kneading machine to be preheated; adding the forming agent at the massratio to conduct mixing; and extruding feed. Through the preparation method, the fluidity can be improved by 30% or more, the consistency of products can be ensured, and the production and processingtime can be saved.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to 1.4435 stainless steel injection molding feedstock and a preparation method thereof. Background technique [0002] With the continuous advancement of social science and technology and the vigorous development of global industrialization, the powder metallurgy injection molding process has developed rapidly due to its many advantages, and its technology has been widely used in military, transportation, machinery, electronics, aerospace, aviation, etc. field. [0003] MIM (Metal injection Molding, metal injection molding) feeding is the core process of metal injection molding product preparation. It is to mix metal powder and molding agent in a certain proportion at a certain temperature, and then cut and granulate to cool into granules. feeding process. [0004] Stainless steel is one of the most widely used raw materials in the powder metallurgy industry. Among them,...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F3/10B22F1/00
CPCB22F3/1025B22F3/225B22F1/10
Inventor 张伟明黄煜庞前列
Owner DONGGUAN HUAJING POWDER METALLURGY
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