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Injection molding process of metal powder metallurgical workpiece

An injection molding process and powder metallurgy technology, applied in the field of metal powder metallurgy, can solve problems such as poor hardness

Inactive Publication Date: 2015-12-16
ZHONGSHAN YAOWEI POWDER UNIT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the workpiece after injection molding is degreased, and there is a problem of poor hardness after firing

Method used

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  • Injection molding process of metal powder metallurgical workpiece
  • Injection molding process of metal powder metallurgical workpiece
  • Injection molding process of metal powder metallurgical workpiece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: Injection molding, the mixture of metal powder and organic binder is injection molded into an injection base through an injection molding machine; wherein, the metal powder is composed of iron, nickel, carbon, and in every 100 parts by weight of metal, nickel: 7.75 parts, 0.3 parts of carbon, and the balance of iron, the organic binder is specifically a polymer material, and the weight ratio of the metal powder and the organic binder is 80:20.

[0030] Step 2: remove the organic binder, and remove the organic binder in the injection mold by thermal decomposition;

[0031] The degreasing temperature is 110±10°C, the time is 660min, the speed of the nitric acid pump is 70 rpm; the degreasing nitrogen flow rate is 2.5-3.0m3 / h, the blowing nitrogen flow rate is 2.5-3.0m3 / h, and the nitric acid concentration is 98% mole percent;

[0032] Specifically, the product is neatly placed into the furnace with carbon plates, and the adhesive inside the blank is removed by usi...

Embodiment 2

[0042] Step 1: Injection molding, the mixture of metal powder and organic binder is injection-molded into an injection base through an injection molding machine; wherein, the metal powder is composed of iron, nickel, carbon, and in every 100 parts by weight of metal, nickel: 8.25 parts, 0.3 parts of carbon, and the balance of iron, the organic binder is specifically a polymer material, and the weight ratio of the metal powder and the organic binder is 89:11.

[0043] Step 2: remove the organic binder, and remove the organic binder in the injection mold by thermal decomposition; the specific method is as in Example 1;

[0044] Step 3: Sintering, sintering the injection blank, the sintering temperature is as follows.

[0045]

[0046] Step 4: Quenching, at 900-1000°C, in CO 2 Quenching in an atmosphere for 2.5 hours;

[0047] Step 5: Tempering, at 150-250°C, tempering for 1 hour. to get the finished product.

Embodiment 3

[0049] Step 1: Injection molding, the mixture of metal powder and organic binder is injection molded into an injection blank through an injection molding machine; wherein, the metal powder is composed of iron, nickel, carbon, and in every 100 parts by weight of metal, nickel: 8 parts, 0.35 parts of carbon, and the balance of iron, the organic binder is specifically a polymer material, and the weight ratio of the metal powder and the organic binder is 85:15.

[0050] Step 2: remove the organic binder, and remove the organic binder in the injection mold by thermal decomposition; the specific method is as in Example 1.

[0051] Step 3: Sintering, sintering the injection blank, the sintering temperature is as follows.

[0052]

[0053] Step 4: Quenching, at 900-1000°C, in CO 2 Quenching in an atmosphere for 1.5 hours;

[0054] Step 5: Tempering, at 150-250°C, tempering for 2 hours. to get the finished product.

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Abstract

The invention discloses an injection molding process of a metal powder metallurgical workpiece. The injection molding process comprises the following steps that 1, injection molding is performed, namely injection molding is conducted on a mixture of metal powder and an organic binding agent by means of an injection molding machine to obtain an injection blank; 2, the organic binding agent is removed, namely the organic binding agent in the injection blank is removed by adopting a chemical or thermal decomposition method; 3, sintering is performed, namely the injection blank is sintered; 4, quenching is performed, namely quenching is performed in the CO2 atmosphere at the temperature of 900-1000 DEG C for 1.5-2.5 hours; 5, tempering is performed, namely tempering is performed at the temperature of 150-250 DEG C for 1-2 hours. The injection molding process is used for manufacturing the metal powder metallurgical workpiece high in surface hardness.

Description

technical field [0001] The invention relates to the field of metal powder metallurgy, in particular to an injection molding process of metal powder metallurgy workpieces. Background technique [0002] Powder metallurgy is an industrial technology for producing metal powder or using metal powder (or a mixture of metal powder and non-metal powder) as raw material, forming and sintering to produce metal materials, composite materials and various types of products. At present, powder metallurgy technology has been widely used in transportation, machinery, electronics, aerospace, weapons, biology, new energy, information and nuclear industries, and has become one of the most dynamic branches of new material science. Powder metallurgy technology has a series of advantages such as significant energy saving, material saving, excellent performance, high product precision and good stability, and is very suitable for mass production. In addition, some materials and complex parts that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/115
Inventor 杨云霖
Owner ZHONGSHAN YAOWEI POWDER UNIT CO LTD
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