Manufacturing method of valve spring superior in durability

Details Manufacturing method of valve spring superior in durability Manufacturing method of valve spring superior in durability

1998-03-12

2000-02-22

Echols, P. W.

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148230, 298969, 72 53, 451 37, C21D 902

Patent

active

060275774

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.

REFERENCES:
patent: 2249677 (1941-07-01), Wallace
patent: 4604881 (1986-08-01), Lienert
patent: 5665179 (1997-09-01), Izawa et al.

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