Papers in JOURNAL OF THE JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY
(Vol.38 No.441 Octomber 1997)
Torsional Strength of Camshaft Assembled by Shave-Joining Method
Yasuyoshi EGAMI, Yoshikatsu NAKAMURA,
Takeshi HIRAOKA and Terufumi MACHIDA
(Received on March 25, 1997)
A complex camshaft, which consists of a steel pipe shaft with knurled right-angular teeth and cam pieces to be shave-joined, was newly designed to achieve the high performance required for automotive engines such as durability, reduced weight and low cost. This paper mainly describes the results of torsional and durability tests of actual size parts using four kinds of medium carbon cam pieces/medium carbon steel pipe. The experimental results are summarized as follows. With increasing the shaving depth and inner surface hardness of the cam pieces, the torsional strength and torsional fatigue strength are uniformly increased by the effect of the engage depth between metals. The strength improves when the number of knurls is increased, and the X-ray measured residual circumferencial stress on the cam piece surface agrees well with the above strengths.
Key words : camshaft, shave-joining method, knurling, cam piece, carbon steel pipe, torsional strength, durability, residual stress, shaving depth
Hem-Joining of Dissimilar Metal Tubes
(Received on February 12, 1997)
Makoto MURATA
A new method for joining tubes made of different types of materials has been invented by the author. The
strength of the joining parts and their susceptibility to gas leakage were examined experimentally. The cross
sections were examined at the joining parts. The strength of the joining part was found to be stronger than
that of the original tube, and the joining part was leak-proof at pressure 1.0 MPa.
Key words : joining, tube forming, tensile strength, leak test