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Abstract：
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To develop hot spinning technology of thin-walled tubular workpieces of titanium alloy,formation mechanism of spinning defects,such as crack,pileup,bulge,wrinkle and diameter error,and corresponding control methods were studied,based on which large thin-walled tubular workpieces of TA15 alloy were well formed. The results show that it is crucial to ensure uniform plastic flow during hot spinning of thin-walled workpieces of titanium alloy,which is directly influenced by heating modes,spinning process parameters and die parameters.The optimum temperature of hot spinning of TA15 alloy is in the range of 600-700 ℃.The spinning temperature should keep higher relatively to avoid crack when tube wall is still thick,and the temperature should decrease to control pileup of metal before the rollers when tube wall becomes thinner.With decreasing wall thickness of tubular workpiece of titanium alloy,bulge and wrinkle tend to take place more easily and should be restrained by proper process measures.Especially when the ratio of wall thickness to diameter(t/D) is smaller than 1%,small reduction rates should be adopted to eliminate local buckling.In addition,small working angle and big round radius of rollers could improve the uniformity of spinning deformation of titanium alloy to ensure forming quality of spun workpieces.
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Reference：
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