Abstract

The effects of thickness reduction, feed ratio, and ball diameter, and their coupling effects, on the average relative stress triaxiality during spinning are discussed via simulation results. The relationships among the parameters and the average value of relative stress triaxiality (AVRST) are fitted with multiple nonlinear functions to calculate the optimal process parameters. According to the trend of stress triaxiality, the corresponding process parameters are calculated for the minimum average value of relative stress triaxiality (AVRST). Room temperature experiments performed on an AZ31 magnesium alloy thin‐walled tube with the optimal parameters reveal an improvement of cracking of the tube surface. The study reveals changes in the minimum AVRST and aids in selecting the process parameters to improve plastic performance.

Highlights

  • E effects of thickness reduction, feed ratio, and ball diameter, and their coupling effects, on the average relative stress triaxiality during spinning are discussed via simulation results. e relationships among the parameters and the average value of relative stress triaxiality (AVRST) are fitted with multiple nonlinear functions to calculate the optimal process parameters

  • En, the workpiece placed outside the mandrel comes into contact with the balls, and the workpiece is compressed to produce plastic deformation. e main parameters for the ball-spinning process are shown in Figure 2, where R is the ball radius, Δt is the thickness reduction, f is the feed ratio, and α is the spinning angle

  • Results of Finite-Element Calculation e three main process parameters—ball diameter, thickness reduction, and feed ratio—affect the stress state of the workpiece during spinning, and the coupling effects between these parameters are significant. erefore, the relationships between one of these parameters and the other two parameters are studied. e AVRST in the deformation-affected zone under different parameter configurations for each group in Table 3 is plotted as a graph

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Summary

Introduction

Academic Editor: Pavel Lejcek e effects of thickness reduction, feed ratio, and ball diameter, and their coupling effects, on the average relative stress triaxiality during spinning are discussed via simulation results. e relationships among the parameters and the average value of relative stress triaxiality (AVRST) are fitted with multiple nonlinear functions to calculate the optimal process parameters. E relationships among the parameters and the average value of relative stress triaxiality (AVRST) are fitted with multiple nonlinear functions to calculate the optimal process parameters. According to the trend of stress triaxiality, the corresponding process parameters are calculated for the minimum average value of relative stress triaxiality (AVRST). Room temperature experiments performed on an AZ31 magnesium alloy thin-walled tube with the optimal parameters reveal an improvement of cracking of the tube surface. E study reveals changes in the minimum AVRST and aids in selecting the process parameters to improve plastic performance. In [7], the finite-element method was used to simulate the thin-walled tube ball spinning, and the reasonable process parameters were obtained. Δt a study on the in uence of the ball size on deformability of thin-walled tubular part with longitudinal inner ribs

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