Processing limit maps for the stable deformation of dieless drawing |
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| Authors: | Yong He Xue-feng Liu Jian-xin Xie Hong-gang Zhang |
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| Institution: | 1.Key Laboratory for Advanced Materials Processing (MOE),University of Science and Technology Beijing,Beijing,China;2.State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing,China |
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| Abstract: | Tin bronze wires were produced by dieless drawing. The effects of heating power, the distance between cooler and heater as
well as feeding speed on the diameter, the temperature field, and the deformation region profile of the wires were investigated.
The results indicated that each processing parameter exhibited both lower and upper limits of stable deformation based on
the criterion of stable deformation with the diameter fluctuation of ±0.05 mm. Both the temperature and its gradient of the
deformation region increased with increasing heating power under stable deformation, but decreased with an increase in feeding
speed. As the distance between cooler and heater increased, the temperature of the deformation region increased and the slope
of the deformation region profile decreased. The processing limit map of stable deformation exhibited a closed curve and the
unstable deformation consisted of wire breakage and diameter fluctuations. |
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