二段充てん法による内歯車の成形

概要

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Shaping of an internal gear by two-step extrusion is proposed. That is, a mandrel, having involute teeth and its diameter increased two steps, was used to expand the inner diameter of the workpiece. The specifications of gears formed were as follows : module m=1. 0 〜 1. 75 mm, pressure angle α= 20°, number of teeth Z = 16 〜 11, whole tooth depth h = 2. 00 〜 2. 25 module. The material used was a S 15 C steel with phosphate coating as a lubricant. It is shown that the tooth depth of the first expanding part of the mandrel greatly affects the formation of the complete toothed gear. It is also shown that the reduction of area of only 9. 5% can be shaped and the highest values of mean compressive stress on the punch and the stepped mandrel are 350 MPa and 650 MPa, respectively, which are far below the strengths of these die materials.
一般社団法人日本機械学会の論文
1994-05-25