我厂在试制数控机床用滚珠丝杠时,淬火后弯曲变形曾用热校直法进行校直,随后吊挂冷却并多次复查和校正弯曲变化。但当零件冷却至室温及回火后往往弯曲振摆要超过允许量,此时如再进行校直容易招致断裂而报废。我厂庞忠礼师傅提出加压回火的工艺方法,经过实践证明是有效的。例如φ45×2154毫米的滚珠丝杠热铰直后最大弯曲振摆为0.25毫米, I plant in trial production of CNC machine tools with ball screw, after quenching and bending deformation with heat straightening method for straightening, then hanging cooling and repeated review and correction of bending changes. However, when the parts are cooled to room temperature and tempering tend to be more than the allowable flexural vibration, this time as re-calibrated easily lead to rupture and scrapped. Pang Zhongli master factory proposed pressurized tempering process, proved to be effective. For example, φ45 × 2154 mm ball screw heat hinge straight after the maximum bending pendulum is 0.25 mm,