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钛板零件热校形的本质是材料软化及应力松弛。在对TA2(工业纯钛)、TC_1(Ti—2A1—1.5Mn)、TC4(Ti—6A1—4V)钛板进行高温拉伸与短时应力松弛实验中,我们采用激光扫描变形测量仪和X-Y函数记录仪,实现了应力应变及应力松弛曲线的自动记录。 本文提出用对数方程作为应力应变关系及高温短时应力松弛的数学模型,进而求得了板料在热校形中的塑性纯弯曲回弹角度及回弹半径公式。在不同的热校形条件下,计算值与实验结果相近,所得公式可用于定量估算弯曲件在热校形中的工艺参数。
Titanium plate thermal profile is the essence of material softening and stress relaxation. In the high-temperature tensile test and short-term stress relaxation test on TA2 (industrial pure titanium), TC_1 (Ti-2A1-1.5Mn) and TC4 (Ti-6A1-4V) titanium plates, Function logger to achieve automatic recording of stress and strain and stress relaxation curves. In this paper, the logarithmic equation is taken as the mathematical model of stress-strain relationship and short-time stress relaxation at high temperature, and then the plastic pure bending rebound angle and the rebound radius formula of the sheet in the hot calibration are obtained. Under different thermal conditions, the calculated values agree well with the experimental ones. The obtained formulas can be used to quantitatively estimate the process parameters of the curved parts in the thermal calibration.