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Formula and process for powder metallurgy

A metallurgical powder and formula technology, which is applied in the field of metallurgical powder formula and technology, can solve problems such as poor adaptability, and achieve the effects of high production efficiency, low wear rate, and wide application range

Inactive Publication Date: 2012-07-11
王萍
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the wear resistance of the bearing and improve its weldability, the carbon content in the finished bearing is 0.4%, and the product is produced by a press molding method. However, its formula and manufacturing process have limitations, and special processes are required. Poor adaptability

Method used

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specific Embodiment

[0012] Mixing steps: Ratio of raw materials, measured by weight, copper powder (Cu) 10%, molybdenum powder (Mo) 5%, nickel powder (Ni) 2%, aluminum powder (Pb) 57%, graphite (C) 12% %, molybdenum disulfide (MoS2) 3.5%, cast stone 2.5%, silicon carbide (SiC) 3%, mullite (3AL2O3 2SiO2) 6%, and the rest are iron powder, free lubricant and cutting performance improving powder.

[0013] Pressing step: Send the mixed raw materials into the upper part of the press, and put them into the cavity of the mold through the extra box for automatic pressing. The pressing speed is 8 pieces per minute, and then sent to the turntable by the robot.

[0014] Sintering steps: sintering in the mesh belt sintering furnace, from the feed inlet to the stainless steel mesh belt, and from the outlet to the outlet, it takes 4 hours, the preheating temperature is 750°C by electric heating, and the sintering temperature is 1100°C. Hydrogen and nitrogen are used as the protective atmosphere, the purpose of ...

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Abstract

The invention provides a formula and a process for powder metallurgy. The formula comprises Fe-based powder, machinability improving powder and a free lubricant; the Fe-based powder comprises, by weight, 7 to 14% of copper powder (Cu), 2 to 8% of molybdenum powder (Mo), 0.5 to 3.5% of nickel powder (Ni), 1 to 7% of aluminum powder (Pb), 8 to 16% of graphite (C), 1 to 5.5% of molybdenum disulfide (MoS2), 1.5 to 5% of cast stone, 0.5 to 5% of silicon carbide (SiC) and 4 to 9% of mullite (3Al2O3.2SiO2), with the balance being iron powder, the machinability improving powder is composed of calcium phosphate compounds, and the free lubricant contains at least one selected from the group consisting of thermoplastic resin powder, zinc stearate and lithium stearate.

Description

technical field [0001] The invention relates to a metallurgical process, in particular to a metallurgical powder 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 mass production, if the method of simplifying the formula and reducing the process steps is adopted, the manufacturing efficiency will be greatly improved. The material composition includes 100 parts of iron powder, 0.35 to 1.2 parts of graphite powder, 0.4 to 0.5 parts of aluminum disulfide, and 0.5 to 3 parts of copper powder. 0.08 part of machine oil is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C30/02C22C33/02C22C1/05
Inventor 王平
Owner 王萍
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