Abstract
Authors have previously proposed the two-step cold extrusion method to form a spur gear. This proposal is made based on the experiment using low-carbon material. In this paper, the effect of materials, five kinds of steel from 0.45% to 1.00% carbon content, for shaping gears by two-step method are reported. The specifications of spur gear examined were as follows : module 1.25,number of teeth 18. Materials used were. It is shown that all materials examined successfully produce a complete teethed spur gear even for high carbon material.
