Method for preparing high-hardness wear-resistant powder metallurgical rolling sleeve

Abstract

The invention relates to a method for preparing a high-hardness abrasion-resistant powder metallurgic roller sleeve, which is characterized in that the method adopts powder metallurgic technology for manufacture, and comprises the following steps: firstly, powder mixing, namely mixing iron powder, carbon powder, chromium powder or ferrochrome powder and a lubricant, and guaranteeing that the total composition comprises the following components in percentage by weight: 0.3 to 2 percent of carbon, 0.3 to 4 percent of chromium, not more than 2 percent of unavoidable impurities, and the balance being iron; secondly, forming, wherein the density after forming is more than 6.8g / cm; thirdly, sintering; fourthly, machine processing; fifthly, quenching; sixthly, cold treatment; and seventhly, tempering. Compared with the prior art, the method has the advantages that the product mainly comprises the iron, the carbon and the chromium and does not comprise noble metal element such as nickel, molybdenum and tungsten, so that the cost is low; the mechanical properties such as the tensile strength, the hardness and the microhardness of the product are superior to those of products obtained by casting technology; and both the thermal diffusivity and the thermal conductivity of the product are lower than those of the products obtained by the casting technology.

Description

technical field [0001] The invention relates to a method for preparing a high-hardness and wear-resistant powder metallurgy roller sleeve, which can also be applied to the field of shaft sleeves. Background technique [0002] Roller sleeves or shaft sleeves are widely used in compressors, pumps, machine tools, electric tools, automobiles and other fields, which require high strength, high hardness, and high wear resistance. Roller sleeves or shaft sleeves can be made of cast alloys, but the alloy elements contain precious metal elements such as nickel and molybdenum. See Chinese invention patent: ZL200410090214.9, which discloses an "iron-based self-lubricating wear-resistant alloy" (authorized announcement No.: CN1276116C), the alloy material obtained by this patent has high wear resistance and can be used to prepare roller sleeves or shaft sleeves, but the raw materials contain precious metals such as nickel, molybdenum, and tungsten, and are produced by melting and castin...

AI Technical Summary

Problems solved by technology

In addition, powder metallurgy parts are porous parts, and the existence of pores reduces the macroscopic hardness and strength of the material. Therefore, the performance of general powder metallurgy roller sleeves or bushings is difficult to meet the requirements of compressors, pumps, machine tools, electric tools, automobiles, etc.

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