Lossless ball screw pair static stiffness measurement device

Abstract

The invention discloses a lossless ball screw pair static stiffness measurement device which comprises a test stand body, a loading ball screw pair, a loading beam, a pressure sensor, a pressurizationdevice, an axial displacement measurement device, a measurement disk, a rotation measurement device, a rotation measurement reference part, a first guide rail, a to-be-measured ball screw pair, a torque transmission device, a torque sensor, a servo motor, a speed reducer, a synchronous pulley and an industrial personal computer. The industrial personal computer controls the servo motor to drive the speed reducer, the synchronous pulley and the loading ball screw pair so as to implement loading of the loading beam. The pressure sensor reads a stress of a to-be-measured screw in real time, theaxial displacement measurement device reads an axial length change of the to-be-measured screw in real time, and the stress is divided by the axial length change to obtain axial static stiffness of the to-be-measured screw. The rotation measurement device carries out compensation on an experimental error generated due rotation and torsion of the screw; and the torque sensor reads a torque which the screw suffers from in real time so as to obtain torsion static stiffness of the screw. The lossless ball screw pair static stiffness measurement device is simple in structure and easy to operate, and a measurement result is high in reliability and accurate.

Description

technical field [0001] The invention belongs to the field of rigidity detection of a ball screw pair, in particular to a non-destructive ball screw pair static stiffness measurement device. Background technique [0002] Ball screw pairs are widely used in feed systems. With the continuous increase of the speed of the ball screw pair, its vibration problem is becoming more and more prominent, which seriously affects the positioning accuracy and accuracy maintenance ability of the feed system. The rigidity of the ball screw pair seriously affects the transmission performance and vibration amplitude of the feed system. Insufficient rigidity of the ball screw pair has become the main obstacle for the development of CNC machine tools and automation equipment to high speed and high precision. [0003] At present, there are some shortcomings in the measurement of the static stiffness of the ball screw pair. Many existing test equipment also need to cut off the sample when carryin...

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Problems solved by technology

[0003] At present, there are some deficiencies in the static stiffness measurement of the ball screw pair. Many existing test equipment also need to cut off the sample when carrying out the rigidity test, which cannot meet the requirements of the non-destructive rigidity test. For example, the paper "Theoretical analysis of the static stiffness of the ball screw pair A vertical ball screw counter axial static stiffness measurement device is proposed in "Development and Research of Test Platform", which can realize effective measurement of static stiffness measurement. However, due to the limitation of experimental space, it is necessary to measure the Cutting off is a lossy way of measuring

In addition, most of the existing test equipment focuses on the axial static stiffness of the screw, without considering the influence of the torsional stiffness of the screw pair, and the measurement results have a certain deviation from the actual value

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