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【答案】应助回帖
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zoe122208: 金币+100, 翻译EPI+1, ★★★★★最佳答案 2013-11-13 10:35:52
After this， its strain path is analysed. Strain paths of six points considering temperature are shown in the figure. For convenience of observation, six 3-dimensional curves are projected onto the primary and secondary strain plane respectively. It is realised that all the strain paths are simple and only that for point 3 is slightly more complex while all the others being fundamentally in a stretching-press state (drawing). The temperatures at the points, however, are low (780°C) and at a low temperature, the mobility of the material is reduced. Hence, though the strain paths are rather simple, cracking nevertheless occurs. At the same time, this cracking has also to do with the excessively high drawbead at the corner. In this case the drawbead height is reduced to 2/3 of the original. Reducing the drawbead resistance implies reduced the local material feeding resistance. Increasing the radius of rounded corner at the step for the die parting surface will make it easier to feed the material at the corner. After reducing the drawbead height, the strain values of the semifinished parts are all below limiting forming plane and therefore safe. After analysing the strain paths of all six points, it is found that all strain paths are in principle in stretching-press state and the temperatures are mostly over 800°C.
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