在25～870℃温度范围内进行了厚度为2.0 mm纯钼板的单向拉伸试验,建立了高温拉深有限元分析模型.通过数值模拟与试验对比分析,确定了纯钼板高温变形摩擦与温度的关系,研究了成形温度、润滑、压边间隙和模具尺寸对热拉深工艺的影响,并采用优化的工艺参数进行了平底杯形冲头热拉深试验.结果表明,润滑条件对纯钼板热拉深影响最显著,其次是成形温度;在成形温度870℃,拉深速度30 mm/min,有润滑,压边间隙2.5 mm的参数组合下,最大拉深比可达1.94.
Uniaxial tensile tests for pure molybdenum sheets with thickness of 2.0 mm were conducted in a temperature range between 25 and 870 ℃,and the finite element model for hot deep drawing of molybdenum plate was established.Based on the contrastive analysis of FEM and experiments,the relationship between friction coefficient and temperature was confirmed,and the effects of forming temperatures,lubricating conditions,blank-holder gap and die dimensions on deep drawing process were investigated,and then the vacuum hot deep drawing tests were carried out with optimized process parameters.The results indicate that lubrication has the most prominent effect on the deep-drawing process,followed by the forming temperature.The limiting drawing ratio can be raised up to 1.94 with the optimum parameters including forming temperature 870 ℃,drawing speed 30 mm/min and blank-holder gap 2.5 mm under lubricated condition.
参考文献
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