Planar two-degree-of-freedom high-frequency loading device and testing platform for ball screw pair

Abstract

The invention relates to a planar two-degree-of-freedom high-frequency loading device and testing platform for a ball screw pair. The planar two-degree-of-freedom high-frequency loading device for a ball screw pair comprises a flexible hinge parallel mechanism basic body, a first driving branched chain, and a second driving branched chain. The center of the flexible hinge parallel mechanism basic body is equipped with a rigid moving platform. A first flexible branched chain and a second flexible branched chain are disposed along two vertical directions through the center of the rigid moving platform, and are symmetrically and fixedly connected with the rigid moving platform. A first installing groove and a second installing groove which reach side end faces are disposed on the flexible hinge parallel mechanism basic body along the extending line of the first flexible branched chain and the extending line of the second flexible branched chain, respectively. The first driving branched chain comprises a first driver connector, a first piezoelectric ceramic brake, and a first tension and pressure sensor which are installed in the first installing groove. The second driving branched chain comprises a second driver connector, a second piezoelectric ceramic brake, and a second tension and pressure sensor which are installed in the second installing groove.

Description

technical field [0001] The invention relates to a loading device and a test platform for a ball screw pair, in particular to a plane two-degree-of-freedom high-frequency loading device and a test platform for a ball screw pair. Background technique [0002] The linear feed system of the ball screw pair has been widely used in the mechanical equipment industry. As the most important functional component in the transmission system of the CNC machine tool, the performance of the ball screw has a decisive influence on the machining accuracy and dynamic performance of the CNC machine tool. In the performance test stage of the ball screw pair linear feed system, it is necessary to perform a performance test on the ball screw pair under simulated working conditions to verify whether the ball screw pair can meet the performance standards for actual use. In the machining process of CNC machine tools such as cutting and milling, the load on the processed workpiece installed on the aux...

AI Technical Summary

Problems solved by technology

At present, the common loading methods that can adjust the loading frequency mainly include counterweight, hydraulic pressure, pneumatic or motor compression springs, etc. Among them, the method of counterweight can only achieve constant load loading; hydraulic loading requires a long loading time and poor dynamic performance , can not achieve high-frequency loading, and the structure of the hydraulic loading device is relatively complex, easy to leak oil, and the reliability of the device is low; the use of pneumatic principles for loading has a low stiffness of the loading mechanism, which cannot achieve high-frequency loading, and it is difficult to guarantee the loading accuracy ;Using motor compression springs for loading can achieve high loading accuracy, but due to the low spring stiffness, it is also difficult to achieve high-frequency loading

At present, the commonly used loading mechanism that can realize multi-degree-of-freedom loading can only realize static loading in all directions, and the use of hydraulic, pneumatic and other methods can only achieve low-frequency alternating load loading, and because of the low stiffness of the loading mechanism. The dynamic characteristics are poor, and there is a long response time in different loading directions during composite loading, and it is difficult to accurately coordinate and control the loading forces in different directions at the same time, making it difficult to generate accurate resultant forces under high-frequency loading

[0004] To sum up, none of the existing ball screw pair loading devices can meet the high-frequency, high-precision loading of the ball screw pair with two degrees of freedom in the plane, and the requirements of fast response performance, resulting in the inability to accurately simulate The high-frequency alternating and complex changing load forms of the CNC machine tool in the cutting, milling and other processing processes or other complex working conditions

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