精密螺纹副装配, 扭矩/时间控制法, 有限元仿真, 动力学仿真

Since the frictions in different screw threads are uncertain, and merely improving the control precision of torque can not assure the conformity of the pre-tightening force, a control method, torque/time control method, of the pre-tightening force was presented. The method was based on the relation of the pre-tightening force to torque and nut corner, and followed the slope changes of torque to time and the system stiffness of the screw thread at the same rotate speed. Offering different tightening torques to every screw thread can reduce the uncertainty influence of the friction in the assembly process and improve the conformity of the pre-tightening force. The assembly process of tightening nut was simulated, and analyzed by using torque/time control method. The results indicate when the ratio of stiffness to the slope of torque is ±0.02%, the precision of the pre-tightening force is 2.94%. The control method of torque/time has a preferable precision.

precise screw thread assembly, torque/time control, finite element analysis(FEA), dynamics simulation