Process for producing camshaft with cams subjected to remelting

Details Process for producing camshaft with cams subjected to remelting Process for producing camshaft with cams subjected to remelting

1986-02-24

1987-04-28

Albritton, C. L.

Electric heating

Metal heating

By arc

219121EM, 219121PY, 219121FS, 219137R, B23K 2600

Patent

active

046616764

ABSTRACT:
A process for producing a camshaft with cams include the steps of forming a surface hardened layer in each of the cams by a remelting chilling treatment using high density energy (e.g., a TIG arc), characterized in that after the remelting chilling treatment, the camshaft is cooled by passing a cooling medium through a through hole formed longitudinally in the camshaft. As a result of the cooling, the neighboring untreated cam has a temperature of up to 250.degree. C. Elongation of the camshaft due to thermal expansion is so small that no melt-down end portion defects appear.

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