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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。
In the temperature range of 25 ~ 870 ℃, the uniaxial tensile test of 2.0 mm pure molybdenum plate was carried out, and the finite element model of high temperature drawing was established. Through the numerical simulation and experimental comparative analysis, the relationship between temperature and high temperature deformation friction of pure molybdenum plate was determined, and the influence of forming temperature, lubrication, blank clearance and die size on hot drawing process was studied. The optimized process parameters Flat cup-shaped punch hot drawing test. The results show that the lubrication conditions have the most significant influence on the hot drawing of pure molybdenum plate, followed by the forming temperature. Under the combination of parameters of forming temperature of 870 ℃, drawing speed of 30 mm / min, lubrication and blank clearance of 2.5 mm, Deep than up to 1.94.