High-speed ball screw friction performance analysis and experimental study
|School||Lanzhou University of Technology|
|Course||Mechanical Design and Theory|
|Keywords||Ball Contact characteristics Transfer efficiency Friction torque|
CNC precision ball screw is a key feature , with the development of high-speed cutting technology for ball screw linear speed of the increasingly high demand. High-speed ball screw while bringing the temperature rise due to friction problem , the temperature rise as a constraint to high-speed ball screw key factor . Contact characteristics of ball screw and transmission efficiency at high speed under the influence of high-speed ball screw friction torque generating mechanism, a friction torque analysis equation to solve the heating problem of high-speed ball screw to provide theoretical and technical support has important theoretical and practical significance. In this paper, Hertz contact theory , in considering the helix angle of the case analysis in ball screw ball and raceway contact characteristics . Use of static equilibrium ball screw from the ball and the raceway consider only sliding friction , rolling friction and rolling consider only sliding friction into account three aspects , the establishment of ball screw transmission efficiency equation . From the contact stress , axial elastic deformation and transmission efficiency increases three aspects screw helix angle after impact and the use of theoretical calculations , finite element simulation and experimental methods to verify the correctness of modeling . According to Hertz contact model and tribological principles, research generates friction torque ball screw mechanism . Using the particle -based kinetic energy theorem to establish the ball in the frictional torque inverter model . Consider contact load and speed on the friction coefficient , the establishment of the ball screw vice frictional torque analysis model and analyze different friction torque load and speed on impact . To analyze the friction torque on the screw heat effect , the use of heat transfer theory to establish a frictional torque and screw the relationship between temperature rise equation . The experiments measuring the screw speed is different at different times within the temperature changes, the establishment of friction torque model for verification.