基于响应曲面法的AZ31B镁合金油浴加热渐进成形性研究

Study on formability of incremental forming by oil bath heating for AZ31B magnesium alloy based on response surface method

针对镁合金室温成形性差的特性,提出了一种以油浴装置为热源,进行整体加热的渐进成形新技术。为了验证油浴加热方法的可行性,基于实验设计法,对AZ31B镁合金板材成形时的成形能力进行了实验研究,并建立了成形性和相关工艺参数之间的二次回归预测模型,通过响应曲面法及方差分析,探讨了工艺参数及两个工艺参数交互作用对其成形性的影响。结果表明:油浴辅助加热渐进成形技术能够成形镁合金板材,影响渐进成形性强弱的工艺因素依次为成形温度、层进给量、板材厚度和刀具直径。验证结果表明:AZ31B镁合金油浴加热渐进成形性的预测模型是正确的,最终得到合适的成形温度为250℃,最大成形角可达68. 1885°。

For the poor formability of magnesium alloy at room temperature,an innovative incremental forming technology using an oil bath device as the heat source for overall heating was proposed. In order to examine the effectiveness and formability of oil bath heating,based on the experimental design method,the formability of AZ31B magnesium alloy sheet in forming process was experimentally studied,and the quadratic regression prediction model between formability and related process parameters was established. Then,the influences of process parameters and the interaction of two process parameters on the formability were discussed by the response surface method and the variance analysis. The results show that the AZ31B magnesium alloy sheets can be formed by the incremental forming with the oil bath heating,and the order of process factors affecting the incremental formability is forming temperature,layer feeding amount,sheet thickness and tool diameter. The verification results show that the prediction model of incremental formability by oil bath heating for AZ31B magnesium alloy is correct,the suitable forming temperature is 250 ℃,and the maximum forming angle is up to 68. 1885°.