Valve Spring with High Fatigue Resistance for Automotive Engine

880417

02/01/1988

Event
SAE International Congress and Exposition
Authors Abstract
Content
Recently, SiCr clean steel wire for springs on automotive engine valves has been developed. This report describes the characteristics of valve springs subjected to a new manufacturing process using SiCr clean steel wire. The process developed by the authors is as follows: First, form a helical spring with SiCr clean steel wire. Next, quench using the distortion preventing technic --Marquenching--. Temper at a temperature lower than the conventional temperature. Shot peen to the surface layer of the spring. And lastly, polish electrolytically to remove micro surface defects formed through shot peening. Using this new manufacturing process, a valve spring with high fatigue resistance can be produced. At the test stress of 588MPa(τm)±490MPa (τa), the number of cycles to fracture was above 100 million, while the number of cycles to fracture was 4 million using the conventional process with the SiCr clean steel which has the best fatigue resistance for commercial use.
Meta TagsDetails
DOI
https://doi.org/10.4271/880417
Pages
12
Citation
Shibata, T., Yamamoto, S., and Hashimoto, Y., "Valve Spring with High Fatigue Resistance for Automotive Engine," SAE Technical Paper 880417, 1988, https://doi.org/10.4271/880417.
Additional Details
Publisher
Published
Feb 1, 1988
Product Code
880417
Content Type
Technical Paper
Language
English