Ball screw assembly precision retaining testing apparatus with characteristics of precise pre tightening and loading

Abstract

The invention provides a ball screw assembly precision retaining testing apparatus. A linear feeding system comprises a pedestal; supports are arranged at the two ends of the pedestal; a servo motor is arranged at one support and is connected with a ball screw; guide rails are fastened and connected to the two sides of the pedestal; and a work bench is connected on the two guide rails in a sliding mode. A lead screw nut sleeves the ball screw and is connected with the work bench by the lead screw nut firmly. A loading force simulation system consists of a linear motor platform mechanism fixed on the pedestal; and a sliding platform of the linear motor platform mechanism is connected with the sliding rails in a sliding mode. A pull pressure sensor is arranged between the sliding platform and the work bench. A pre-tightening adjusting system includes a lead screw nut, a sleeve, a pressure sensor, a support ring, and a fixed ring, wherein the units sleeve the ball screw in sequence; and a piezoelectric ceramic actuator is arranged between the support ring and the fixed ring. According to the invention, the pre-tightening force of the lead screw nut is controlled precisely based on the expansion value of the piezoelectric ceramic actuator, so that automatic compensation for attenuation of the pre-tightening force during the operation process of the ball screw assembly can be guaranteed.

Description

technical field [0001] The invention relates to a test device, in particular to a test device for the precision retention of a ball screw pair capable of precise preloading and loading. Background technique [0002] Ball screw pair has the advantages of high positioning accuracy, high transmission efficiency, good reliability and long service life. It has been widely used in the field of electromechanical equipment and is an extremely important part of the transmission system of CNC machine tools. In recent years, the performance of domestic ball screw by-products has been greatly improved. However, in the high-end products of ball screw pair, there is still a big gap with the international advanced level. One of the most important reasons is that the technology of reliability and precision retention of ball screw pair is relatively backward. The problem of the precision retention of the ball screw pair directly affects the life and performance of the CNC machine tool equip...

AI Technical Summary

Problems solved by technology

[0004] If the accuracy retention test of the ball screw pair has guiding significance for theoretical research and practical enterprise application, then the test device can highly simulate the alternating loads of the ball screw pair in actual working conditions on the one hand, and can meet the requirements on the other hand. Control the size of the pretightening force of the screw nut and make it not attenuate with the operation, so as to provide more meaningful data for the accuracy retention technology of the ball screw pair, and improve the test ability of the machine tool enterprises for the accuracy retention of the ball screw pair. Existing test equipment has not been able to meet the requirements required for the above-mentioned ball screw accuracy retention test

Images