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Powder metallurgy prescription and technique

A technology of powder metallurgy and formula, applied in the field of powder metallurgy formula and process, can solve the problems of poor adaptability and achieve the effect of reliable finished product performance, low cost and optimized process steps

Inactive Publication Date: 2008-08-27
ZHEJIANG ZHONGPING POWDER METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its formula and manufacturing process are still limited, and its adaptability to special process requirements is poor

Method used

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  • Powder metallurgy prescription and technique

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Embodiment

[0019] figure 1 Shown is a schematic representation of the process flow of the embodiment of the present invention, including:

[0020] Mixing step: mix raw and auxiliary materials according to parts by weight, graphite powder is 0.05% to 5%, zinc stearate is 0.08% to 7%, copper powder is 0.1% to 10%, and the rest is iron powder Than mix evenly.

[0021] Pressing step: Send the mixed iron powder into the upper part of the press, and put it into the cavity of the mold through the powder filling box for automatic pressing. The pressing speed is 8 pieces per minute, and then send it to the turntable with a manipulator.

[0022] Sintering steps: sintering in the mesh belt sintering furnace, conveying from the inlet with a stainless steel mesh belt, and discharging from the outlet takes 4 hours, the preheating temperature is 730°C with electric heating, and the sintering temperature is 1100°C. with H 2 and N 2 As a protective atmosphere, its purpose is H 2 Reduction of oxygen ...

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Abstract

The invention discloses a metallurgic powder formulation and a process thereof. The metallurgic powder comprises graphite powder 0.05% to 5%, zinc stearate 0.08% to 7%, copper powder 0.1% to 10%, and iron powder in balance. The process comprises the following steps of: mixing, pressing, sintering, soaking in oil, finishing, treating by steaming, and deburring. Compared with prior art, the metallurgic powder has low cost and reliable product performance by adopting the formulation: graphite powder 0.05% to 5%, zinc stearate 0.08% to 7%, copper powder 0.1% to 10%, and iron powder in balance. Moreover, the process is properly optimized and simplified, and the steam treatment step can form a dense protection film on the product surface to improve the rustproof performance.

Description

technical field [0001] The invention relates to a metallurgical process, in particular to a powder metallurgy formula and process. Background technique [0002] Generally, the powder metallurgy process used in the society usually goes through the processes of mixing-stirring-forming-sintering-shaping-secondary sintering-mechanical processing-heat treatment-oscillating grinding-vacuum oil immersion and other processes. As the country pays more and more attention to environmental protection, in the machinery industry, simplifying the process steps will save a lot of energy. However, in order to improve the efficiency of batch production, if the method of simplifying the formula and reducing the process steps is adopted, the efficiency of its manufacture can be greatly improved, such as the application number 200610051686.2 "Weldable Powder Metallurgy Bearing and Production Technology" (Notice No. CN1851280A) is exactly this type of design. In order to achieve the above-mentio...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F3/16B22F3/26
Inventor 郑平龙朱飞高
Owner ZHEJIANG ZHONGPING POWDER METALLURGY
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