聚醚醚酮板材热风局部加热单点渐进成形实验研究

Experimental study on single point incremental forming of PEEK sheets assisted with hot air local heating

为探究聚合物在局部加热下的成形性能,使用热风局部加热单点渐进成形工艺制备聚醚醚酮四棱台零件。采用单因素法分析了局部加热温度场、层间距以及进给速度对聚醚醚酮零件成形力及成形精度的影响规律。结果表明,成形前预热处理不能有效提高零件成形精度。相比进给速度,层间距对成形力的影响更显著;在不同的成形温度下,零件成形力随加工点温度的上升而下降。加工点温度对零件成形精度的影响主要体现在夹持区域牵连变形,零件在140℃下成形时精度最高;层间距和进给速度对零件成形精度的影响主要体现在夹持区域回弹与侧壁鼓突,零件在1500 mm·min^(-1)进给速度、0.25 mm层间距下成形精度最高。

To investigate the formability of polymer under local heating,Polyether ether ketone(PEEK)pyramid parts were fabricated by single point incremental forming assisted with hot air local heating.The effect laws of local heating temperature field,step size and feed rate on the forming force and forming accuracy of PEEK parts were analyzed by single factor method.The results show that the forming accuracy of the parts cannot be improved by preheating treatment before forming.The effect of step size on forming force is more significant than that of feed rate.At different forming temperatures,the forming force of the parts decreases with the increase of the temperature of processing point.The effect of processing point temperature on the forming accuracy of parts is mainly reflected in the implicated deformation in the clamping area.The accuracy is the highest when the part is formed at 140℃.The effect of step size and feed rate on the forming accuracy of parts is mainly reflected in the springback and side wall bulge of clamping area.The parts have the highest forming accuracy with the feed rate of 1500 mm·min-1 and the step size of 0.25 mm.