镍钛形状记忆合金线材无模拉拔成形过程的电磁场和温度场模拟

Simulation on Electromagnetic and Temperature Fields in Dieless Drawing Forming of NiTi Shape Memory Alloy Wires

无模拉拔成形过程的电磁场和温度场数值模拟对于正确制定加工工艺, 精确控制线材质量十分重要.利用ANSYS有限元软件, 对镍钛形状记忆合金线材无模拉拔成形过程的电磁场和温度场进行了数值模拟, 获得了镍钛形状记忆合金线材无模拉拔成形时的电磁场和温度场信息, 并进行了讨论.提出了较合理的镍钛形状记忆合金线材无模拉拔成形工艺参数范围: 电流频率59～61 kHz、电流密度(2.95～3.05)×107 A·m-2、冷却水与感应加热线圈之间的距离19～22 mm、冷却水流量22～26 ml·s-1.

It is most important for correct process pa- rameters selection and precise quality-controlling to simulate electromagnetic and temperature fields in dieless drawing forming. The electromagnetic and temperature fields in dieless drawing forming of NiTi shape memory alloy wires are analysed using ANSYS finiteelement software. The reasonable ranges of the process parameters are put forward as follows： current frequency 59-61 kHz, current density （2.95 - 3.05）×10^7 A·m^-2, distance between heater and cooler 19- 22 mm and cooling water flow 22 - 26 ml·s^-1