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Method for extruding and molding metal powder gelatin

A technology of metal powder and extrusion forming, which is applied in the field of metal powder gel extrusion forming, can solve the problems of low production efficiency, tedious time-consuming, high production energy consumption, etc., and achieve the goals of reduced production cost, excellent comprehensive performance and improved strength Effect

Inactive Publication Date: 2009-09-02
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems of tedious and time-consuming traditional powder injection molding degreasing process, easy formation of green body defects, high production energy consumption and low production efficiency due to high molding pressure

Method used

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  • Method for extruding and molding metal powder gelatin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the gel extrusion molding of YG6 cemented carbide rod

[0021] 1. Weigh 1.5kg of YG6 cemented carbide powder, add 56ml of hydroxyethyl methacrylate and 56ml of toluene into the organic solution, mix and stir evenly;

[0022] 2. Weigh 4g of Solsperse-6000 hyperdispersant and add it to the slurry in the first step, and stir evenly to make a high-concentration suspension slurry;

[0023] 3. Measure 0.4g of catalyst benzoyl peroxide and 3.6ml of initiator dimethylaniline into the high-concentration suspension slurry in the second step, stir evenly and degas under vacuum for 3 minutes;

[0024] 4. Inject the vacuum-degassed slurry in step 3 into the extrusion die, close the extrusion port of the extrusion die, apply a pressure of 1.2 MPa under vacuum to pre-press the billet, and use pressure to induce solidification and densification to make it densified and Preform;

[0025] 5. Open the extrusion port of the extrusion equipment, set the pressure of 3MPa and ...

Embodiment 2

[0028] Example 2: Gel extrusion of titanium-cobalt alloy parts

[0029] 1. Weigh 1.6kg of titanium powder and 50g of cobalt powder, and mix the powder in a planetary ball mill for 2 hours to make a mixed powder;

[0030] 2. Dissolve 135g of monomeric acrylamide and 0.1g of cross-linking agent N,N'-methylenebisacrylamide in 750ml of deionized water, add the mixed powder in step 1, and stir evenly;

[0031] 3. Measure 3.5ml of dispersant oleic acid and add it to the solution in the second step, stir evenly to make a slurry;

[0032] 4. Exhaust the slurry in step 3 for 15 minutes under high vacuum;

[0033] 5. Measure 3.5ml of catalyst N, N, N', N'-tetramethylethylenediamine and 4ml of initiator ammonium persulfate (to ensure sufficient injection molding time), add to the slurry in step 4, stir evenly, Simultaneously vacuum degassing.

[0034] 6. Inject the slurry into the extrusion die under vacuum, close the extrusion port of the extrusion die, apply 0.8MPa pressure under va...

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Abstract

The invention relates to a method for extruding and molding metal powder gelatin, which belongs to the field of metal part preparation in powder metallurgic production technology. The method is characterized by comprising the steps: firstly, premixed liquid with finite concentration is prepared; then, metal powder is added into the premixed liquid to prepare a stable gelatin system; the stable gelatin system is extruded and molded to prepare a blank body; and finally, the blank body is sintered into a part. The invention breaks through the traditional molding technology and can prepare metal products with large sizes and complicated shapes. Compared with the pressure molding, the invention solves the problems of complicated shape limitation and energy consumption caused by overlarge pressure needed by molding, and greatly improves the molding condition. Compared with the injection molding and the hot pressure casting molding which need to be added with a lot of organic binding agents, the method does not need a special degreasing step, has simple technology and can greatly reduce the production cost.

Description

technical field [0001] The invention relates to a metal powder gel extrusion forming method, which belongs to the field of metal parts preparation in the powder metallurgy production process, and in particular provides a metal powder gel- Extrusion method. Background technique [0002] Compression molding is one of the main methods for forming metal and alloy powders. Powder injection molding combines the advantages of traditional powder metallurgy and plastic injection molding technology, and breaks through the limitations of traditional metal powder compression molding technology on product shape. But large-sized products are always limited due to factors such as mold cost, manufacturing defects, equipment capacity and processing time. In the 1980s, the emergence of powder plasticized body extrusion forming technology enriched the forming process of metal and ceramic powder, making the metal parts prepared by powder metallurgy develop towards miniaturization and precisio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/20B22F9/16B22F9/06
Inventor 邵慧萍杨栋华郭志猛林涛罗骥郝俊杰
Owner UNIV OF SCI & TECH BEIJING
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