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US 5,674,111 AGranted
Method of processing a workpiece
AssigneeFuji Oozx Inc.
InventorsKatsuhiko Harada, Michio Araki
Life of this patent
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Abstract
A workpiece is processed to manufacture a poppet valve comprising a larger diameter head and a stem. First, the stem is ground to correct bending and warping and to remove black skin formed by a mold releasing agent, and, then the stem of the workpiece is cut, thereby preventing variation of the total length and wear of support rollers.
Claims1
A method of processing a poppet valve which comprises a stem and a head, said head having an end face and a diameter that is larger than the stem diameter, wherein the method comprising the steps of:
- engaging the end face of the head with a first loader head to position the poppet valve;
- grinding an outer circumferential surface of the stem;
- supporting the ground outer circumferential surface of the stem by a plurality of support rollers;
- engaging the end face of the head with a second loader head to position the poppet valve;
- and
- cutting the stem at a predetermined distance from the end face of the head while the poppet valve is supported by said plurality of support rollers on said ground outer circumferential surface of said stem.
3 more elements
Dependencies are inferred from the claim text.