Abstract

Abstract Microstructure is one of the key factors determining the mechanical properties of an axle, which requires to obtain fine and uniform grain structure. This research work aims to explore the influence of different process parameters on the average grain size and distribution uniformity of the rolled piece during the closed-open cross wedge rolling (CWR) process, so as to improve the micro quality of the rolled piece by adjusting the process parameters. Firstly, an automobile oil pump axle made of 42Crmo is considered as a research object, and a 3D thermal-mechanical-microstructure coupled finite element model of closed-open CWR is established by adopting software DEFORM. Secondly, three points are uniformly selected along the central axis of the rolled piece as observation points, and the variation law of the average grain size at different positions with time is studied. Thirdly, the effects of the reduction of area, the diameter of the rolled piece, the forming angle of the wedge section and the stretching section on the average grain size of the rolled piece and the uniformity of the grain distribution are studied separately. Finally, combined with the closed-open CWR experiment, the influence of different billet diameter on the average grain size is consistent with the simulation results, which verifies the reliability of the model.

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