Alloy steel gear resistant to fatigue pitting

Abstract

An alloy steel gear anti-fatigue pitting belongs to the technical field of powder metallurgy. The components of the gear and their weight percentages are: C 0.2-4.3%, Si 0.7-1.2%, Mn 0.125-0.25%, Cr 0.01-0.03% , W 0.015~0.125%, S 0.1~0.2%, P 0.25~0.35%, Zn 0.015~0.025%, Ti 0.015~0.018%, and the rest is Fe with metallographic structure of ferrite + ledeburite and unavoidable Impurities. After the gear is formed, the surface carburizing treatment, quenching treatment, normalizing, tempering and grinding are carried out successively, which improves the internal mechanical properties of the gear, its toughness and fatigue strength have been greatly improved, and the mechanical properties of the surface are improved, especially The stress on the surface is passivated, the service life of the gear is greatly improved, and it meets the needs of various high-load and high-speed applications.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to a gear, in particular to an alloy steel gear resistant to fatigue pitting corrosion. Background technique [0002] China's gear industry has developed rapidly during the "Tenth Five-Year Plan" period: in 2005, the annual output value of the gear industry increased from 24 billion yuan in 2000 to 68.3 billion yuan, with a compound annual growth rate of 23.27%, and it has become the largest in China's mechanical basic parts. industry. In terms of market demand and production scale, China's gear industry has surpassed Italy in the global ranking, ranking fourth in the world. [0003] Gears and their gear products are important basic parts of mechanical equipment, and the main transmission parts of most complete sets of mechanical equipment are gear transmissions. With the rapid development of the national economy, the total annual sales of the entire industry have exceeded...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of traditional gears, such as the decrease in toughness when the hardness increases, and the fact that the tooth surfaces of traditional gears are easy to wear, and the teeth are prone to plastic deformation or breakage, the present invention proposes an alloy steel gear that resists fatigue pitting corrosion. The points are more reasonable and the working life is longer, which can greatly improve the mechanical properties of gears and meet the needs of various load-bearing and high-speed occasions.