在机械加工中,经常用铰杠进行攻丝、铰孔等(结构如图1所示)。由于使用时间较长,导致固定夹块4、活动夹块5、活动手柄7损坏。其中损坏最严重的是活动夹块、活动手柄两个零件。因为固定夹块4、活动夹块5是夹持丝锥和铰刀尾部四方形柱体,它们承受夹紧力和扭矩,磨损后致使固定夹块4、活动夹块5合拢时形成的四方 In machining, often tapping hinge, reaming, etc. (structure shown in Figure 1). Due to the use of a long time, resulting in fixed clip 4, movable clip 5, the movable handle 7 is damaged. One of the most serious damage is the activities of clamps, the activities of the two parts handle. Because the fixed clamp block 4, the movable clamp block 5 is a square cylinder holding the taps and reamer tail, they bear the clamping force and torque, resulting in wear and tear when the fixed clamp 4, the movable clamp 5 is formed when the four sides closed