In order to improve the contour dimension accuracy and surface quality of the formed parts in CNC incremental forming, a method for generating the secondary extrusion forming path was proposed, which can be applied to correct the dimension errors and eliminate the scallop height. First of all, the first extrusion forming path was generated by cutting the cutter location surface according to a certain layer dis-tance, which was obtained by the equidistant offset of the inner surface of the sheet metal part to be formed with a distance of the extrusion forming tool head radius. Then the cutter location points were determined by recognizing the peaks of the scallop height. Finally the secondary extrusion forming path was generated by cutting the cutter location surface according to the height of the average value of the Z coordinate of the cutter location points on the same layer. The digital simulation and experimental results show that the me-thod can improve the contour dimension accuracy and reduce the surface roughness effectively.%为提高数控渐进成形中成形件轮廓的尺寸精度和表面质量提出一种可用于修正尺寸误差和消除残余痕迹的2次挤压成形轨迹生成方法.首先利用水平面按一定间距切割将待成形件内表面等距偏置挤压工具头半径得到的刀位面来生成第1次挤压成形轨迹然后通过识别残余痕迹波峰来确定2次挤压成形的刀位点最后以同一层刀位点Z坐标值的平均值为高度切割刀位面生成出2次挤压成形轨迹.数字模拟和实验结果表明该方法能够有效地提高成形件轮廓尺寸精度并降低表面粗糙度.
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