龙门刨床、龙门铣床的工作台及立式车床的花盘,在长期的使用中,由于吊装和装夹工件以及碰撞、敲击等原因造成的碰伤,使其装夹面的表层产生“冷作硬化”,因而引起内应力使工作台变形。开始内应力小,工作台的自重使其伸直在床身上,后来变形随内应力日渐增大,工作台中部凸起,其导 Planer, gantry milling machine table and vertical lathe disk, in the long-term use, due to lifting and clamping workpieces and collision, knocking and other causes bruises, the surface of the clamping surface to produce a “cold work hardening ”, Thus causing internal stress to deform the workbench. The beginning of the internal stress is small, the workbench’s self-weight so that it straightened in the bed, and later deformation with the increasing internal stress, raised in the middle of the workbench, the guide