Electronics Incorporated - The Shot Peener - Shot Peening Library
Title: Manufacturing Method of Valve Spring Superior in Durability
Author: M Mikura; T Nishimura; T Otowa, all of Japan
Source: US Patent 6,027,577
Publication year 2000
Document number: 2000016
Number of pages: 7
Abstract:
In a manufacturing method of a valve spring, a coiled valve spring made of an oil-tempered wire is applied with nitriding treatment and is supported to be rotated about its
center axis. During a shot peening process of the coiled valve spring, cut wires of Hv 650 to 850 in hardness and 1.0 to 0.6 mm in diameter are shot to the coiled valve
spring at a first step, in a roller-type shot machine and cut wires of Hv 650 to 850 in hardness and 0.4 to 0.2 mm in diameter are shot to the coiled valve spring at a
second step in a tumbling shot machine, the time for the second step being longer than the time for the first step.
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This page last revised: 04/24/2008