Ball Screw Friction Torque Influencing Factors And Test Methods

Precision ball screw unit is the key part of NC machine, and its manufacturing level determines the precision level of NC machine to great extent. With the development of mechanical production and NC machine oriented to high-speed, high-precision, multi-purpose and environmentalization, the performance of ball screw units is demanded higher.The friction moment is an important usage function parameter of the ball screw unit. It influences energy exhaust, temperature, voice, and vibration variety directly, Exorbitant temperature increase will cause lubricant worsen, abrasion turn worse, even cause the work surface burn. Therefore friction moment testing of ball screw unit is a basic request of factory examination. Currently our country in addition to the Taiwanese region compares to abroad still have a very big margin in high-speed ball screw unit development. In addition to original material and accuracy of the equipments, don't have perfect examination means also is an important reason to restrict its development. According to this we develop friction moment of ball screw unit test instrument. Passed by sensor choosing, soft and hardware design and interface circuit design, etc. It can carry out the following function: According to the collecting data draw friction moment graph real time; Calculate and analyze measuring data; show "China/ English report", "print measurement report", "print the customer report"; The measurement results, moment data and measured ball screw parameters can be saved in dish as a data backup each time. At any demand time re-appear and can also output to print as examination report.This text commences from appearance mechanism of ball screw friction moment, combining its structure characteristics, analyzing influence factor of ball screw friction moment. Also passing bear force analysis, of ball bearing in the rolling way, stressed pre-tighten force influence to friction moment, getting the relation of pre-tighten force and friction moment, provide theories support for testing methods research and results analysis. Then elaborate the function and realization of the instrument, and analysis the result and testing error at the end.