Cylinder apparatus and method of manufacturing rod for cylinder apparatus
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United States of America Patent
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N/A
Issued Date -
Feb 26, 2004
app pub date -
Feb 25, 2003
filing date -
Feb 28, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A groove processing method capable of smoothly processing a groove on a rod that has been subjected to a hardening treatment without a substantial degradation in strength is provided. A pair of straightening rollers is mounted at each side of rolling rollers mounted on respective rotating shafts of a rolling machine with spacers disposed between the straightening and rolling rollers. A rod is previously subjected to a hardening treatment, for example, high-frequency induction hardening and tempering, or carbulizing & quenching and tempering, so that the surface hardness is not less than 400 Hv. A groove is formed on the rod by rolling using the rolling rollers, thereby allowing a surface hardening layer to be left on the bottom of the groove. At the same time, the rod is held by the straightening rollers to prevent bending of the rod.
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