A High-precision Electric Spindle Loading Mechanism Based on Piezoelectric Ceramics

Abstract

A piezoelectric ceramic-based high-precision electric spindle loading mechanism comprises a loading component and an adjusting component, the loading component is arranged on the adjusting component,the loading component comprises counter force supporting cylinders, a plurality of stress loading cylinders and a plurality of piezoelectric ceramics; each stress loading cylinder is externally sleeved with the counter force supporting cylinder, and each stress loading cylinder has an axial movement degree of freedom in the counter force supporting cylinder; each piezoelectric ceramic is connectedbetween the inner surface of the bottom of the counter force supporting cylinder and the outer surface of the bottom of the stress loading cylinder; the cylinder opening of each stress loading cylinder adopts an arc surface structure, the radian of the cylinder opening of the stress loading cylinder is the same as the radian of the outer surface of an electric spindle to be tested, the pluralityof piezoelectric ceramics are arranged between the inner surface of the bottom of the counter force supporting cylinder and the outer surface of the bottom of the stress loading cylinder, a stress sensor is arranged on the cylinder opening of the counter force supporting cylinder, the stress sensor is in contact fit with the outer surface of the electric spindle to be tested, and the radians of the cylinder openings of the plurality of stress loading cylinders are different.

Description

Technical field [0001] The invention belongs to the technical field of electric spindle performance testing, and particularly relates to a high-precision electric spindle loading mechanism based on piezoelectric ceramics. Background technique [0002] The electric spindle is the axis that drives the workpiece or the tool to rotate in a CNC machine tool. It usually consists of a lubrication system, a bearing system, a stator and rotor system, and a cooling system. As a key component of the CNC machine tool, the dynamic performance of the electric spindle will directly affect the high-speed machining accuracy. And processing efficiency. [0003] In order to obtain the dynamic performance of the electro-spindle, it is necessary to perform a performance test on the electro-spindle, which includes a loading test on the rotating motor shaft. Through the loading test, the dynamic performance parameters of the electro-spindle under various operating conditions can be obtained, which can re...

AI Technical Summary

Problems solved by technology

[0004] Since the electric spindle is in a state of high-speed rotation, its loading conditions cannot be changed arbitrarily, so the implementation of the loading test is difficult

At present, the loading test of the electric spindle mainly adopts the dragging type. It is necessary to prepare a dynamometer with the same shaft diameter as the electric spindle, and use the coupling to carry out the dragging. It is difficult to guarantee the accuracy of the loading stress on the electric spindle, and The operation and movement of the dynamometer are very inconvenient. For electric spindles with different shaft diameters, multiple sets of dynamometers need to be prepared, resulting in low overall loading efficiency.

Images