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Abstract：
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In order to study the ball spinning mechanism of thin-walled tube in the multi-pass condition,the stress and strain,the spinning force and the formability of thin-walled tube in multi-pass ball spinning were analyzed by combination of experiment and finite element method(FEM).The results show that with the increase of ball stroke in each pass,both the stress and the strain increase gradually from the inside surface to the outside surface of the spun part.Moreover,the stress and strain increase with the increase of spinning pass.The axial force in each pass increases with the increase of ball stroke and spinning pass.In the multi-pass ball spinning,steady flow of metal can be formed easily because of using small thickness reduction and work hardening of the material,which can ensure elongation of the tube.Therefore,the spinning of thin-walled tube with large thickness reduction can be realized through multi-pass ball spinning.
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Reference：
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