Factors Influencing torsional strength of shave-jointed ring/pipe parts

摘要

Aluminum alloy and mild steel rings were experimentally shave-joined with triangularly knurled steel pipes to study the torsional strength of shave-joined parts such as automotive camshafts. The investigation was conducted under various influencing factors: material combination of ring on pipe, joining temperature, induction heating and shaving depth. Such a ring/pipe shave-joint can be obtained by a lower pressure of press. Joining strength or torsional strength increases uniformly with increasing shaving depth and heating temperature, as the engagement between the inner wall of the ring and the triangular serration of the pipe becomes tighter. Softening of the ring by changing the material and/or heating is observed to be useful for penetrating the knurled serrated teeth of the ring into the inner wall and for increasing lateral stress at the interface. The torsional failure was caused by shearing of the ring material at the interface. Vickers microhardness in the joining parts suddenly changed at the interface of both materials.