FEMシミュレーションによる総転造歯車のまくれ込み発生機構解析

概要

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Full gear rolling, that is one of plastic working methods, has a lot of merits of cost. But it has some problems for practical employment. One of the most principle problem is lap defect. It is initiated on follow side addendum after rolling process. Therefore the aim of this study was simulating full gear rolling process and solving the lap defect problem with use of FEM analysis by MARC. It was high performance analysis because of the simplification of FEM analysis modeling and made the reduction of total calculating time. The main results were as follows. (1) High performance FEM analysis on full gear rolling process could be carried out in order to examine the locus of rolling dies movement. (2) Lap defect was caused by the difference of material flow between follow and driven side on pinion tooth. (3) Initiation and growth of lap defect could be shown on computer simulation and the result of FEM analysis was roughly the same as the results of proof test. (4) It was suggested that control factor of lap defect was work-hardening exponent (n value). Therefore, blank, which has low n value, makes large lap defect.
1998-07-25