Device and method for testing dynamic characteristics of a spindle in a rotating state

Abstract

The invention discloses a dynamic characteristic testing device and method for a spindle in a rotation state. The device comprises the spindle, a rack, a fixing sleeve and the like, wherein the spindle is installed on the rack, one end of the spindle fixing sleeve is installed on the rack, the other end of the spindle fixing sleeve is connected with one end of a connecting support, and an end capis installed at the other end of the connecting support. A knife handle assembly comprises a knife handle, a bearing and a bearing box, wherein the bearing and the bearing box sequentially sleeve theknife handle from inside to outside, the knife handle assembly is sleeved by the connecting support and the spindle fixing sleeve, one end of the knife handle is connected with a rotor of the spindle,and a knife point at the other end extends out of the end cap. An actuator assembly comprises a piezoelectric actuator, the side face, perpendicular to the axial direction of the spindle, of the connecting support is sequentially provided with three installing holes, and the piezoelectric actuator of the actuator assembly, an acceleration sensor and a displacement sensor are respectively installed in three installing holes. The method adopts the piezoelectric actuator to exert excitation, adopts the knife handle assembly to achieve loading and can accurately and conveniently test dynamic characteristics of the spindle in the rotation process.

Description

technical field [0001] The invention relates to a dynamic characteristic testing device and method in the rotating state of a main shaft. A piezoelectric actuator is used to apply excitation and a tool handle assembly is used to realize loading, so that the dynamic characteristic of the main shaft during the rotating process can be accurately and conveniently tested. Background technique [0002] The machine tool spindle is one of the core components of ultra-precision machine tools. Its dynamic characteristics and stability largely determine the processing performance and efficiency of the machine tool, and have an important impact on the life, reliability and safety of the entire processing system. Therefore, It is very important to study the dynamic characteristics of the electric spindle. The method of testing the dynamic characteristics of the spindle in engineering is usually carried out by means of vibration exciter or hammer knocking when the spindle is stationary, b...

AI Technical Summary

Problems solved by technology

Sawamura et al [Development of Dynamic Loading Device for Rotating Spindle of Machine Tools] from Kyoto University in Japan used an electromagnetic loading device to test the static stiffness of the milling machine spindle at different speeds. Since the electromagnetic field is easy to induce eddy currents on the surface of the tested spindle, Therefore, it has a certain influence on the test results

In addition, Feng Ming from Beijing University of Science and Technology [Development of High-speed Spindle Non-Contact Air Film Loading Stiffness Test Bench] designed a device that uses static pressure air film to load the electric spindle, and uses air bearings and aerostatic thrust bearings to realize the alignment of the spindle. Loading in a rotating state, but only static or slowly changing loads can be applied to the spindle, and the applied load force is small, so the application is limited

[0004] Generally speaking, there are relatively few studies on the dynamic characteristics test under the spindle rotation state, and there are certain problems in various test methods, and it is difficult to accurately test the dynamic characteristics under the spindle rotation state.

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