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一、钛壳的差温拉深钛壳形状如图1所示,尺寸小但深度大,像这种零件,即使最优良的材料也需多次拉深。在常温下钛板拉深性并不好,对TA 1～TA 2来讲,许用的常温拉深系数约为m=0.55,而极限拉深系数m≈0.5。图1示钛壳(TA 1或TA 2厚0.5毫米)估算的拉深系数约为m=0.26～0.28。某厂成形相似零件用了五套拉深模,四次真空退火工序。退火次数多,则钛板性能变坏,使拉深更难进行。 TA 1或TA 2钛板在500℃下等温拉深,其极限拉深系数m=0.35～0.36。普通的差温拉深,凹模和压边圈内装有加热装置,给毛料凸缘加热,凸模内通水冷却。采用凸模冷却以后,TA 1或TA 2的极限拉深系数可达0.32～0.34。我们采取的差
First, the difference between the temperature of the titanium shell Titanium shell shape shown in Figure 1, the small size but large depth, like this part, even the most excellent material also need to draw several times. Titanium plate drawing at room temperature is not good, for TA 1 ~ TA 2, the allowable room temperature drawing coefficient of about m = 0.55, and the ultimate drawing coefficient m ≈ 0.5. Figure 1 shows the estimated depth of draw of the titanium shell (TA 1 or TA 2 0.5 mm) is approximately m = 0.26 to 0.28. A similar shape of a factory using five sets of drawing die, four vacuum annealing process. Annealing frequency, the deterioration of the performance of titanium, the drawing is more difficult to carry out. The TA 1 or TA 2 titanium plate isothermally drawn at 500 ℃ with the ultimate drawing coefficient m = 0.35 ~ 0.36. Ordinary differential temperature deep drawing, die and blank holder with heating device, to wool flange heating, punch cooling water. After the punch cooling, TA 1 or TA 2 limit drawing coefficient of up to 0.32 ~ 0.34. We take the difference