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Title: Valve Spring With High Fatigue Resistance For Automotive Engine
Author: Shibata, Yamamoto, Hashimoto
Source: SAE: 880417
Publication year 1988
Document number: 1988050
Number of pages: 9
Abstract:
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(\gtm)\mP490MPa (\gta), 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.
Descriptors: Springs; Quenching; Tensile strength; Shot peening; Fatigue
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