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Feed for metal injection molding and preparation method of feed

An injection molding and feeding technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve problems such as constraints, and achieve the effects of guaranteed use effect, high degreasing rate and enhanced strength

Inactive Publication Date: 2017-01-04
JIANGXI YUEAN SUPERFINE METAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commercially available feed materials for metal injection molding are in the hands of large foreign companies, which restricts the rapid development of the domestic industry. It is necessary to research and develop feed materials for metal injection molding.

Method used

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  • Feed for metal injection molding and preparation method of feed
  • Feed for metal injection molding and preparation method of feed

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preparation example Construction

[0019] A method for preparing the feed material for metal injection molding, comprising: uniformly mixing polyoxymethylene, high molecular polymer, compatibilizer, plasticizer, surfactant and lubricant at 150-200°C to obtain a viscous Binder; then mix the binder and metal powder to make feed.

[0020] Further, in other preferred embodiments of the present invention, polyoxymethylene, high molecular polymer, and compatibilizer are uniformly mixed in a vacuum environment of 195-200°C to obtain a mixture, and the temperature is lowered to 150-160°C, and the mixture is Add plasticizer, surface active agent and lubricant to the mixture and mix uniformly to obtain binder. First mix at 195-200°C to ensure that the mixing temperature is above the melting point of each polymer component, so that the polymer components can be fully melted and mixed evenly, and then lowered to 150-160°C to add small molecule components, which can Try to avoid the destruction of small molecular component...

Embodiment 1

[0025] This embodiment provides a feedstock for metal injection molding, which is prepared by the following steps:

[0026] Add 75kg of homopolyoxymethylene, 8kg of polyethylene, and 3kg of ethylene acrylic acid copolymer into a vacuum mixer, mix evenly in a vacuum environment of 200°C to obtain a mixture, cool down to 160°C, and add 5kg of phthalic acid di Octyl esters, 0.5kg zinc stearate, and 4kg paraffin wax were mixed uniformly to obtain the binding agent.

[0027] Put 943kg of metal powder into the kneader and preheat to 160°C, add the above binder to the preheated metal powder, keep kneading at 160°C for 2 hours, extrude into strips with an extruder, and break into granules, get fed.

Embodiment 2

[0029] This embodiment provides a feedstock for metal injection molding, which is prepared by the following steps:

[0030] Add 78kg of homopolyoxymethylene, 10kg of polyethylene, and 2kg of ethylene-vinyl acetate copolymer into a vacuum mixer, mix evenly in a vacuum environment of 200°C to obtain a mixture, cool down to 160°C, and add 6kg of phthalate to the mixture Dioctyl formate, 1 kg of zinc stearate, and 1 kg of paraffin were mixed uniformly to obtain the binder.

[0031] Put 934kg of metal powder into the kneader and preheat to 160°C, add the above binder to the preheated metal powder, keep kneading at 160°C for 2 hours, extrude into strips with an extruder, and break into granules, get fed.

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Abstract

The invention provides feed for metal injection molding and belongs to the field of metal molding. The feed is prepared by mixing 9.2-10.5 wt% of binder with 89.5-90.8 wt% of metal powder. The metal powder laser grain size distribution D90 ranges from 18 micrometers to 30 micrometers. The binder comprises polyformaldehyde, a high-molecular polymer, a plasticizer, a surfactant, a compatilizer and lubricant. A preparation method of the feed includes the steps that the binder is obtained after polyformaldehyde, the high-molecular polymer, the compatilizer, the plasticizer, the surfactant and the lubricant are mixed to be uniform at the temperature of 150-200 DEG C; the feed is prepared after the binder and the metal powder are mixed. The feed is high in fluidity, the binder is easy to remove, and the obtained product is high in dimensional precision and small in impurity content. The preparation method of the feed is easy and convenient to operate, the uniform feed can be efficiently obtained, various ingredients in the feed are not damaged, and the use effect of the feed is well guaranteed.

Description

technical field [0001] The invention relates to the field of metal forming, in particular to a feed material for metal injection molding and a preparation method thereof. Background technique [0002] Metal injection molding (Metal Injection Molding, referred to as MIM) is derived from plastic injection molding. Metal injection molding technology and plastic injection molding technology also have the ability to form complex-shaped products at one time, with high dimensional accuracy and no need for machining or only minimal processing. Etc. At the same time, metal injection molding technology also overcomes the shortcomings of low product strength in traditional plastic molding technology. [0003] Metal injection molding usually includes the steps of preparation of feedstock, injection molding, debinding and sintering. The preparation of feed is a very important part. The feed is usually kneaded by metal powder and binder. The composition of the binder is particularly cri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F1/00
CPCB22F3/225B22F1/103B22F1/10
Inventor 李上奎王兵李博曾杰邹海平
Owner JIANGXI YUEAN SUPERFINE METAL
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