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Mixed powder for electric tool and preparation method thereof

A power tool and powder mixing technology, applied in the field of powder metallurgy, can solve the problems of agglomeration, alloy element powder particle bulge, insufficient compression density, etc., and achieve the effect of reducing bulge or agglomeration, uniform microstructure and improving mechanical properties.

Active Publication Date: 2013-04-03
ANGANG (ANSHAN) METALLURGY POWDER MATERIAL CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By selecting appropriate alloying elements, the hardenability of the material can be effectively improved, so that the product undergoes a martensitic transformation during a series of heat treatments, and at the same time has a certain degree of toughness. Water atomized alloy powder can effectively improve the quality of powder metallurgy. The comprehensive mechanical properties of the products, especially the impact-resistant products such as electric tools, have good comprehensive performance, and can ensure the dimensional tolerance of powder metallurgy products. If the direct mixing method of alloy raw materials is used, the disadvantage is that the compression density is not high enough, only up to 7 g / cm 3 Below; alloying elements cannot be further fully alloyed during the sintering process of the product; segregation of alloying element components will occur during transportation and mixing; fine alloying element powder particles will cause swelling or agglomeration, which will affect the mechanical properties of sintered parts

Method used

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preparation example Construction

[0018] A preparation method of mixed powder for electric tools of the present invention is formed by mixing and bonding diffusion alloy powder, water atomized pure iron powder, graphite powder, copper powder and lubricant in a non-segregation manner, including water atomized pure iron powder Powder preparation step, diffusion alloy powder preparation step and non-segregation mixing and bonding step, the specific implementation steps are as follows:

[0019] 1) The preparation of water-atomized pure iron powder includes smelting, atomization, and reduction processes. The specific description is as follows:

[0020] 1) Smelting: With scrap steel and pig iron as the main raw materials, molten steel with uniform and stable composition and less impurities is obtained through smelting in an electric furnace. The tapping temperature is 1600-1800°C. The chemical composition is as follows in weight percentage:

[0021] C≤0.60%, Si≤0.50%, Mn≤0.50%, P≤0.050%, S≤0.050%, the balance is Fe;...

Embodiment 1

[0036] 50% water atomized diffusion alloy powder, 0.5% graphite powder, 0.35% copper powder, 0.7% lubricant, and the balance is water atomized pure iron powder. The proportion of its chemical composition by weight percentage is: C 0.52%, Si 0.032%, Mn 0.15%, P 0.014%, Ni 0.91%, Mo 0.24%, Cu 1.11%, S 0.023%, Fe is the balance.

Embodiment 2

[0038] 52% water atomized diffusion alloy powder, 0.45% graphite powder, 0.33% copper powder, 0.75% lubricant, and the balance is water atomized pure iron powder. The proportion of its chemical composition by weight percentage is: C 0.47%, Si 0.032%, Mn 0.15%, P 0.014%, Ni 0.93%, Mo 0.25%, Cu 1.10%, S 0.023%, Fe is the balance.

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Abstract

The invention belongs to the field of powder metallurgy, and particularly relates to mixed powder for an electric tool and a preparation method thereof. The mixed powder is characterized by being prepared by mixing and bonding water-atomized diffused alloy powder with water-atomized pure iron powder, graphite powder, copper powder and a lubricating agent in a segregation-free way, wherein the ratio of components by weight percentage as follows: 50-55 percent of water-atomized diffused alloy powder, 0.4-0.5 percent of graphite powder, 0.3-0.35 percent of copper powder, 0.7-0.8 percent of lubricating agent and the rest of water-atomized pure iron powder. The preferable ratio is as follows: 50 percent of water-atomized diffused alloy powder, 0.5 percent of graphite powder, 0.35 percent of copper powder, 0.7 percent of lubricating agent and the rest of water-atomized pure iron powder. Compared with the prior art, the mixed powder has the advantages that 1) the mix powder has over 7.05g / cm3 of compressed density; 2) alloy elements cannot be segregated in the transport and mixing treatment process; and 3) the mechanical performance of sintering parts is effectively improved.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and in particular relates to a mixed powder for electric tools and a preparation method thereof. Background technique [0002] In order to improve the strength, toughness and apparent hardness of powder metallurgy products, the sintering-quenching-tempering production process is currently used. By selecting appropriate alloying elements, the hardenability of the material can be effectively improved, so that the product undergoes a martensitic transformation during a series of heat treatments, and at the same time has a certain degree of toughness. Water atomized alloy powder can effectively improve the quality of powder metallurgy. The comprehensive mechanical properties of the products, especially the impact-resistant products such as electric tools, have good comprehensive performance, and can ensure the dimensional tolerance of powder metallurgy products. If the direct mixing method of alloy r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C38/60C22C38/16
Inventor 卜福昌周振龙纪向军高扬
Owner ANGANG (ANSHAN) METALLURGY POWDER MATERIAL CO LTD
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