Patent ID: 9574531
Date: 2017-02-21
CPC Classifications: B23P,C21D,F02M,F04B,Y02P,Y10T

Claim:
1. A manufacturing method of a camshaft for an HP common rail oil pump, comprising: performing interference assembly of a cam piece and a mandrel while performing quenching heat treatment on the cam piece by installing the mandrel in the heat expanded cam piece at the heating stage during quenching heat treatment, then quickly cooling the cam piece equipped with the mandrel at the cooling stage during the quenching heat treatment to obtain an assembled camshaft; the process further comprising the steps of: preassembling the cam piece on a tooling mandrel; axially and detachably butt-jointing the tooling mandrel with the mandrel to form a mandrel assembly; axially moving the mandrel assembly relative to the cam piece during quenching heating until the cam piece moves to a preset position on the mandrel; and removing the tooling mandrel; wherein the mandrel assembly is in a vertical position and the mandrel assembly falls by gravity when the cam piece is heat expanded.