Research on defects and control method based on thread shaft forming

Abstract

The defects of incomplete tooth, low tooth height and big pitch are easy to produce, when the thread shaft is rolled by cross wedge rolling. The forming defects of teeth are researched by theoretical analysis and numerical simulation, the causes of producing tooth defects are analyzed, and forming process is researched by optimizing the die structure. The open structure of the die is designed as the closed structure on the end of the thread tooth. In addition, the tooth width of the die is optimized from equal width mode to variable width mode. Thus higher quality teeth are obtained and tooth defects are eliminated. The research results have a good reference for accurately forming thread shaft.