A powder metallurgy rolling bearing and its preparation method

Abstract

The invention discloses a powder metallurgy antifriction bearing. The bearing is characterized in that: the bearing is prepared from following raw materials in parts by weight: 0.6-0.8 of graphite, 1.2-1.3 of copper, 2.1-2.3 of silicon, 5.7-5.9 of manganese, 10.2-10.7 of chromium, 0.2-0.3 of molybdenum, 1.2-1.3 of titanium, 0.2-0.3 of titanium diboride, 0.2-0.3 of niobium boride, 0.3-0.4 of V2O5, 2-3 of zinc stearate, 89-91 of waste steel powder and 1-2 of an additive; the graphite is added in the raw materials, thus enhancing the wear resistance and lubricating property of the bearing; the bearing has compact structure, good microstructure, small porosity, and excellent structural stiffness, hardness, antifatigue performance and tensile strength; and the bearing is wear resistant and corrosion resistant, and is low in noise.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a powder metallurgy rolling bearing and a preparation method thereof. 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 cann...

AI Technical Summary

Problems solved by technology

However, the existing bearing steels have the following defects: 1) The surface carburizing steel is the same as the high-carbon chromium bearing steel, it is difficult to reduce the oxygen content in melting and refining, and it is easy to produce non-metallic inclusions such as oxides, which reduces the life of rolling bearings. The main reason

2) High-carbon alloy steel is also prone to generate large carbide particles that reduce the life of rolling bearings. In order to solve this defect, chromium is generally added to the alloy, and high-carbon chromium bearing steel is used

However, martensitic stainless steel has poor cutting performance and cannot perform high-precision cutting, so it cannot be used in precision machines

In order to overcome the above defects, rolling bearing steel with excellent wear resistance and corrosion resistance and low noise has been proposed, but the technology proposed to solve the above problems can completely solve the existing problems of rolling bearings