薄壁球面零件无芯模旋压的壁厚分布

Wall Thickness Distribution of Thin-walled Spherical Parts in Dieless Spinning

目的通过旋压工艺试验,考察球面零件在无芯模旋压中壁厚的分布规律,并与锥形件剪切旋压中的壁厚正弦律进行对比。方法采用圆弧轨迹和多段直线轨迹分别进行旋压试验,测量其壁厚分布与正弦律壁厚进行对比。结果旋轮不论采用圆弧轨迹还是多段直线轨迹,制件大部分区域的壁厚分布满足正弦律,仅制件尾部的壁厚与正弦律偏离较多。结论球面零件和锥面零件旋压过程中存在普通旋压和剪切旋压两个区域,且普通旋压和剪切旋压的分界线与板坯尺寸密切相关,当板坯尺寸大到一定程度时将产生完全的剪切旋压。

The paper aims to investigate wall thickness distribution of spherical parts in dieless spinning by spinning process test,and compare with the sine law of wall thickness in the shear spinning of conical parts.The spinning test was carried out under the arc trajectory and the multi section line trajectory.And their wall thickness distribution was measured and compared with that of sine law.The wall thickness distribution in most parts of the workpiece satisfies the sine law,regardless of the arc trajectory or the multi section line trajectory,only the wall thickness at the end of the part deviated more from the sine law.There are two kinds of forming zones(conventional spinning and shear spinning)during the dieless spinning of spherical parts and conical parts,and their dividing line is closely related to the size of the blank.However,complete shearing spinning will occur when the size of the blank is large enough.