激光辅助加热下的微塑性成形的研究

Investigation into microforming based on laser-assisted heating

为了解决难成形材料微构件成形困难,采用脉冲固体激光器对铝合金微型件进行了辅助加热实验研究,同时利用有限元软件ABAQUS建立了基于激光加热的微镦粗圆柱形工件的热力耦合有限元模型,对激光加热后的温度场分布和微塑性成形过程进行了模拟研究。结果表明,工件在激光功率800mW,加热时间0.08s,光斑半径0.1mm下的温度场分布呈卵圆形,在短时间内温度场基本趋于均匀化,激光加热下的微塑性成形应力比常温下降低了30%左右。这一结果对提高微塑性材料的成形性能和完善微热及微温成形工艺是有帮助的。

In order to solve the forming difficulty occurring in the microforming microparts made of hard-to-deform materials,the experimental study on laser-assisted heating of the micropart of aluminum alloy was performed by means of pulsed laser. With the help of ABAQUS finite element software, the coupled thermomechanical finite element model of microupset was built up based on laser-assisted heating method. Then the temperature distribution of the workpiece and microforming process were simulated and analyzed. The results show that the temperature field distributions are oval and flatting with the certain laser parameters （ laser power is 800mW, heating time is 0.08s and spot radius is 0. 1mm）, and that the temperature distribution is uniform after a very short time. The microforming stress using laser-heating method decreased about 30% compared with that of room temperature. The obtained results are helpful to improve the microforming properties of plastic materials and perfect micro- hot and microwarm forming process.