Transactions of Materials and Heat Treatment

Title：Effect of process parameters on core quality of thread shaft rolling in cross wedge rolling

Authors： Yan Huajun Ma Shibo Han Pengbiao He Xiaoxi Liu Jinping Hu Zhenghuan

Unit： Hebei University of Science and Technology University of Science and Technology Beijing

KeyWords： cross wedge rolling thread shafts change rate of tooth height helix angle core defect

ClassificationCode：TG335.19

year,vol(issue):pagenumber：2014,39(3):62-66

Abstract：

In cross wedge rolling, rolled pieces are forced by two directions compressive stresses and single direction tensile stress，and the core defects such as core loose and crack and so on could be created. The forming processes of rolling thread shafts in cross wedge rolling were simulated by using Deform-3D in different cases. The variation characteristics of stress and strain for parts which are easily to generate defects in core were theoretically analyzed under various conditions, and the influence rules of change rate of tooth height and helix angle on core quality of rolled pieces were obtained. The results show that when the change rate of tooth height is bigger or the helix angle is selected with the calculated value as the diameter size of thread tooth, the stress and strain in the center of rolled pieces are smaller. No core defects appear inside the thread shaft when selecting appropriate process parameters.

Funds：

河北省自然科学基金资助项目(E2012208066; E2011208014); 河北省教育厅自然科学基金项目(Q2012152); 河北科技大学博士基金项目(QD201001)

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