High-wear-resistance air compressor crankshaft and machining method thereof

By performing oxygen-nitrogen co-infiltration treatment on various parts of the air compressor crankshaft to form a composite layer, the problems of insufficient wear resistance and fatigue strength of the crankshaft are solved, resulting in a longer service life and a lower wear rate.

CN122013097APending Publication Date: 2026-05-12XINCHANG COUNTY RIYUE MASCH CO LTD
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Patent Information

Application Number
CN202510782633.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-12
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

Existing air compressor crankshafts have insufficient wear resistance and fatigue strength when subjected to cyclic alternating loads, resulting in a short service life.

Method used

Oxy-nitrogen co-infiltration technology is used to treat the surface of various crankshaft parts. Using urea, potassium nitrate, sodium carbonate and lanthanum trifluoride in the salt bath formula, a composite layer is formed through low-temperature nitriding and high-temperature oxygen diffusion. Combined with high-frequency quenching, laser scanning, rolling and micro-arc oxidation processes, the wear resistance and fatigue strength of each part are improved.

Benefits of technology

It significantly improves the wear resistance and fatigue strength of the crankshaft, extends the service life of the air compressor crankshaft, and reduces the wear rate and crack propagation rate.

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Abstract

The machining method is characterized by comprising the following operation steps of pretreatment of the surface layer of a front end shaft, pretreatment of the surface layer of a crank arm, pretreatment of the surface layer of a rear end shaft and overall assembly of the crankshaft. The step of surface layer pretreatment of the front end shaft, the step of surface layer pretreatment of the crank arm and the step of surface layer pretreatment of the rear end shaft respectively comprise an oxynitriding method; a salt bath is adopted in the oxynitriding method, and the formula of the salt bath comprises, by weight, 30%-50% of urea, 20%-40% of potassium nitrate, 10%-30% of sodium carbonate and 5%-15% of lanthanum trifluoride. The surface layers of all parts of the crankshaft are treated, so that the abrasion resistance of the air compressor crankshaft during operation under high strength is improved, and the service life of the air compressor crankshaft during working is prolonged.
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