Apparatus and method for accelerated degradation test of ball screw pair friction torque

Abstract

The invention discloses a method and device for testing accelerated degradation of the friction moment of a ball screw pair and belongs to the technical field of detection of ball screw pairs. The ball screw pair is connected with a sliding plate through a replaceable main nut and a replaceable auxiliary nut on the two sides respectively. In the test condition, the ball screw pair drives the sliding plate to reciprocate through the main nut, rotation of the sliding plate is limited by the auxiliary nut through a limiting rod, and load testing is conducted on the sliding plate through a load cylinder. In the testing condition, the ball screw pair drives the sliding plate to reciprocate through the auxiliary nut, the main nut is connected with a pull pressure sensor installed on the sliding plate through a force measurement rod, so that the friction torque between the main nut and a lead screw is obtained accurately. During an accelerated degradation test, axial stepping accelerated loading is conducted on the ball screw pair through the axial load cylinder. Modeling of the friction torque degradation process of the ball screw pair can be achieved through the ball screw pair friction torque data obtained through a short-time acceleration test, and the performance degradation life of the ball screw pair is predicted in a short period of time and with low cost.

Description

technical field [0001] The invention relates to a ball screw pair friction torque accelerated degradation test device and method, and belongs to the technical field of ball screw pair detection. Background technique [0002] The ball screw pair is the main functional component of the feed system of CNC machine tools, and its precision performance determines the accuracy of the feed system of CNC machine tools. In order to ensure the transmission accuracy of the ball screw pair, a pre-tightened ball screw pair is generally used. With the actual working process of the ball screw pair, the friction and wear of the moving parts will lead to the loss of pre-tightening force, and the friction torque will also change accordingly. Therefore, the transmission accuracy of the ball screw pair is closely related to its friction torque. Domestic ball screw manufacturing enterprises and related research units have done a lot of research on ball screw pairs, usually on how to precisely me...

AI Technical Summary

Problems solved by technology

Domestic ball screw manufacturing companies and related research units have done a lot of research on ball screw pairs, usually on how to precisely measure the friction torque of the ball screw pair, and have not studied the friction torque with the ball screw pair during the operation process. Experimental research on the degradation process caused by track wear and other reasons, the reason is that the change process of the friction torque of the screw pair is a slow change process

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