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Preparation method for hard alloy products by injection molding

A cemented carbide and injection molding technology, applied in the field of cemented carbide preparation, can solve the problems of product size and shape limitation, out-of-tolerance, easy-to-deform size, etc., achieve high raw material utilization rate, improve product performance, and eliminate internal holes Effect

Inactive Publication Date: 2016-02-03
洛阳暖盈电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional compression molding method cannot produce products with complex shapes, and the size and shape of the products are limited to a certain extent, and are prone to deformation and dimensional tolerance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: The preparation method of the injection molding cemented carbide product of YG8 brand:

[0025] (1) Mixing: Weigh 75% cemented carbide powder and 25% binder according to the weight ratio, and add them into the mixing machine. Wherein, the composition of the binder is 75% paraffin, 5% high-density polyethylene, 5% polypropylene and 15% stearic acid. Heat to 140°C in the mixing machine, and the mixing time is 6h;

[0026] (2) Granulation: Extrude the feed material into strips and strips three times each with an extrusion device, and then granulate through a pulverizer;

[0027] (3) Injection molding: the granulated feed is injected into cemented carbide injection blanks of various shapes by an injection machine. The injection temperature is 160°C, the injection pressure is 60MPa, and the mold temperature is about 30°C;

[0028] (4) Degreasing: remove part of the binder in a trichlorethylene solvent, the degreasing temperature is 50°C, and the degreasing t...

Embodiment 2

[0031] Embodiment 2: the preparation method of the injection molding cemented carbide product of YG13 brand:

[0032] (1) Mixing: Weigh 75% cemented carbide powder and 25% binder according to the weight ratio, and add them into the mixing machine. Wherein, the composition of the binder is 70% paraffin, 5% high-density polyethylene, 5% polypropylene and 20% stearic acid. Heat to 140°C in the mixing machine, and the mixing time is 6h;

[0033] (2) Granulation: Extrude the feed material into strips and strips three times each with an extrusion device, and then granulate through a pulverizer;

[0034] (3) Injection molding: the granulated feed is injected into cemented carbide injection blanks of various shapes by an injection machine. The injection temperature is 160°C, the injection pressure is 60MPa, and the mold temperature is about 30°C;

[0035] (4) Degreasing: remove part of the binder in a trichlorethylene solvent, the degreasing temperature is 50°C, and the degreasing ...

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PUM

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Abstract

The invention provides a preparation method for hard alloy products by injection molding. The preparation method mainly comprises the following steps: (1) mixing: hard alloy powder is mixed with adhesive to prepare an injection filler; (2) injection molding: the filler is in injection molding through an injector; (3) degreasing: solvent is degreased to remove part adhesive; (4) dewaxing and sintering: the dewaxing and the pre-sintering are performed in a sintering furnace; and (5) hot isostatic pressure sintering: the high-temperature and high-pressure sintering is performed in a hot isostatic pressure sintering furnace to obtain a compact product. The preparation method can be used for preparing the hard alloy products with various complex shapes through the injection molding process, holes can be eliminated through hot isostatic pressure sintering, and the bending strength and the fracture toughness are improved.

Description

technical field [0001] The invention relates to the technical field of hard alloy preparation, in particular to a method for preparing an injection molded hard alloy product. Background technique [0002] Cemented carbide has high hardness, high wear resistance, good chemical stability and thermal stability, and is widely used in modern tool materials, wear-resistant materials, high-temperature-resistant materials, corrosion-resistant materials, etc. The traditional compression molding method cannot produce products with complex shapes, and the size and shape of the products are limited to a certain extent, and are prone to deformation and dimensional tolerance. Injection molding technology can manufacture products with complex shapes, high dimensional accuracy requirements, and mass production, with uniform density, the same shrinkage in each direction, similar to precision casting, and good precision and surface roughness, without subsequent processing. [0003] Cemented ...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F3/15
Inventor 贾留宽张玲李伟
Owner 洛阳暖盈电子技术有限公司
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