Prominent Problems in Ball Screw Assembly

The high precision of the ball screw pair has become an inevitable trend in the development of the transmission device, and its installation accuracy on the host has gradually become a prominent problem in the assembly. In order to meet the requirements of the coordinate position accuracy of the machine tool, reduce the deflection of the lead screw, prevent radial and moment offset loads, reduce the temperature rise and thermal deformation of each link of the lead screw shaft system, minimize the transmission torque of the servo motor and improve the continuous flow of the machine tool. In order to ensure the reliability of the work, the reliable installation method and method of the ball screw pair on the mother machine must be improved to ensure the working accuracy of the screw.

The lack of straightness caused by the natural sagging of the ball screw due to its own weight is one of the reasons for the risk of machine tool movement. The straightness of the lead screw is very important whether it is a lead screw rotating type or a nut rotating type lead screw. Poor installation accuracy will cause a series of problems in the operation and life of the lead screw. To solve such problems, the lead screw is usually pre-stretched or supported by auxiliary means.

Ball screw pair is a key component of CNC machine tools. In recent years, with the rapid development of CNC machine tools, higher requirements have been placed on the feed system. Today, CNC machine tool manufacturing technology is developing in the direction of high precision, high reliability, high speed, digitization and intelligence. Whether the ball screw pair runs smoothly or not mainly depends on the variation of the friction torque of the ball screw pair. The fluctuation of friction torque directly affects the stability of the drive system, especially when driving at high speed, the impact on noise, temperature rise, positioning accuracy, etc. is more prominent. Moreover, the friction torque affects the positioning accuracy of the screw, so it is of practical significance to study the friction torque of the ball screw pair on the transmission performance of the screw.