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A stainless steel-based feed material for injection molding and its preparation method

An injection molding, stainless steel technology, applied in the field of powder metallurgy, can solve problems such as large price differences, and achieve the effects of reducing underfill, simple and reliable preparation method, and narrowing of the variation range.

Active Publication Date: 2018-04-13
YUXI DAHONGSHAN MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to solve the problems of the quality, stability and price of injection molding feeds due to the wide variety of metal powder, plastic base, and wax-based raw materials and the large difference in quality and price.

Method used

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  • A stainless steel-based feed material for injection molding and its preparation method
  • A stainless steel-based feed material for injection molding and its preparation method
  • A stainless steel-based feed material for injection molding and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A preparation method of stainless steel-based feed for injection molding, comprising the steps of:

[0049] Step A: Prepare the following components according to the weight percentage: 90.0% of water-gas joint atomized stainless steel powder, 8.0% of polyoxymethylene, 1.0% of high-density polyethylene, 0.5% of ethylene-vinyl acetate copolymer, 0.25% of paraffin wax, hard Fatty acid 0.12%, plasticizer 0.13%, total 100%;

[0050] Step B: After starting the power supply of the banburying device, add the water-air combined atomized stainless steel powder and paraffin wax prepared in step A into the mixing chamber of the banburying device, and then heat up at a heating rate of 60°C / h;

[0051] Step C: When the temperature in the mixing bin in step B rises to 190~220°C, keep the temperature, and stir with the forward-rotating stirring screw and the reverse-rotating extrusion screw at the same time, and stir for 25 minutes to make the water-air joint atomized stainless steel p...

Embodiment 2

[0059] A preparation method of stainless steel-based feed for injection molding, comprising the steps of:

[0060] Step A: Prepare the following components according to the weight percentage: 94.6% of water-gas combined atomized stainless steel powder, 5.0% of polyoxymethylene, 0.2% of high-density polyethylene, 0.0% of ethylene-vinyl acetate copolymer, 0.2% of paraffin, hard Fatty acid 0.0%, plasticizer 0.0%, total 100%;

[0061] Step B: After starting the power supply of the banburying device, add the water-air combined atomized stainless steel powder and paraffin wax prepared in step A into the mixing chamber of the banburying device, and then heat up at a heating rate of 60°C / h;

[0062] Step C: When the temperature in the mixing chamber in step B rises to 190~220°C, keep the temperature, and stir with the forward-rotating stirring screw and the reverse-rotating extrusion screw at the same time, and stir for 35 minutes to make the water-air joint atomized stainless steel p...

Embodiment 3

[0070] A preparation method of stainless steel-based feed for injection molding, comprising the steps of:

[0071] Step A: Prepare the following components according to the weight percentage: 92% of water-air joint atomized stainless steel powder, 6.2% of polyoxymethylene, 0.6% of high-density polyethylene, 0.3% of ethylene-vinyl acetate copolymer, 0.5% of paraffin, hard Fatty acid 0.2%, plasticizer 0.2%, total 100%;

[0072] Step B: After starting the power supply of the banburying device, add the water-air combined atomized stainless steel powder and paraffin wax prepared in step A into the mixing chamber of the banburying device, and then heat up at a heating rate of 60°C / h;

[0073] Step C: When the temperature in the mixing chamber in step B rises to 190~220°C, keep the temperature, and stir with the forward-rotating stirring screw and the reverse-rotating extrusion screw at the same time, and stir for 30 minutes to make the water-gas joint atomized stainless steel powder...

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Abstract

The invention relates to a stainless steel-based feed material for injection molding and a preparation method thereof, belonging to the technical field of powder metallurgy. The invention is formed by adding water-air combined atomized stainless steel powder, polyoxymethylene, high-density polyethylene, ethylene-vinyl acetate copolymer, paraffin, stearic acid and plasticizer into a banburying device according to different time points. The addition of paraffin wax, stearic acid and plasticizers can not only eliminate the phenomenon of bonding equipment during the banburying process, but also strengthen the skeleton of weak parts. The invention can effectively improve the flow performance of parts during injection molding, improve the filling efficiency of feeding materials in the mould, reduce the phenomenon of incompleteness, faults, flow lines and the like of the injected green body, and keep the stable shrinkage rate of the injected green body after sintering. The production process and the use mode of the obtained product of the present invention are relatively simple, and existing equipment does not need to be changed; the ingredients of the components are all conventional, and the raw materials are easy to obtain, which can greatly reduce the feeding cost of injection molding and improve the performance of powder metallurgy products.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a stainless steel-based feed material for injection molding and a preparation method thereof. Background technique [0002] The feed used in the injection molding process is an important factor that determines the preparation cost of powder metallurgy parts, the process parameters of the subsequent degreasing and sintering of injection molding, and the quality and stability of the final product. Because powder metallurgy products have extremely strict requirements on quality and stability, the dimensional tolerance accuracy including length, width, height, thickness, angle, amplitude, diameter, aperture, and distance between holes is often required to be controlled within ±0.03mm or 0.5° , and even have higher requirements for indicators such as hardness and strength. The parts produced by injection molding process often have the characteristics of complex ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22B22F1/00
CPCB22F3/225B22F1/108
Inventor 杨雪峰林安川王涛刘晓红马燕鸿吕福艳吴继云李秋苹张浩泽高顺超
Owner YUXI DAHONGSHAN MINING