基于工具头往复运动加工的数控渐进成形轨迹生成

CNC incremental forming trajectory generation based on reciprocating movement machining of tool head

针对传统的成形工具沿着一个方向运动的数控渐进加工轨迹容易造成材料沿着一个方向流动从而导致成形板材发生破裂的问题,提出了一种基于成形工具往复运动的数控渐进成形轨迹。利用有限元分析软件ANSYS对成形工具沿着一个方向运动和往复运动的数控渐进成形轨迹进行了仿真。结果表明:基于成形工具沿着一个方向运动和成形工具往复运动下,成形后板材的Z向偏差值的平均值与最大值分别为0.1917、0.3947和0.1437、0.3412 mm,后者成形轨迹下板材成形后的轮廓精度更高;另外,相对于前者,后者轨迹下成形后板材的内部材料流动量更小,成形的板材更不容易破裂;最后,前者和后者成形轨迹下,板材成形后的最大应力分别为79.6和61.4 Pa,相对于前者成形轨迹,后者成形轨迹能够降低板材成形过程中的应力。

Aiming at the problem that the CNC incremental forming trajectory with traditional forming tool moving along one direction causes the material to flow along one direction easily so as to make the formed sheet break,a CNC incremental forming trajectory based on the reciprocating movement of the forming tool was proposed,and the CNC incremental forming trajectories with the forming tool moving along one direction and reciprocating movement were simulated by finite element analysis software ANSYS.The results show that the average and the maximum Z direction deviation values of sheet after forming based on the forming tool moving along one direction and reciprocating movement are 0.1917,0.3947 and 0.1437,0.3412 mm,respectively,and the latter forming trajectory has a higher profile accuracy after the sheet is formed.In addition,compared with the former,the inner material flow amount of the formed part under the latter trajectory is smaller,and the formed part is less likely to be broken.Finally,the maximum stresses of the sheet after forming under the former and latter trajectories are 79.6 and 61.4 Pa,respectively.Thus,compared with the former forming trajectory,the latter forming trajectory can reduce the stress during the sheet forming process.