Damping cutter bar for turning coarse-pitch threads

Abstract

The invention relates to a damping cutter bar for turning coarse-pitch threads, and belongs to the field of machining. The damping cutter bar comprises a cutter bar shaft, a cutter bar shaft sleeve, an exciting coil, an upper permanent magnet, a lower permanent magnet, a piezoelectric ceramic piece, an end cover, a magnetorheological fluid and the like, wherein the exciting coil is wound on the cutter bar shaft, a coil lead of the exciting coil is connected with the piezoelectric ceramic piece, the magnetorheological fluid is injected into an annular cavity formed by the upper permanent magnetand the lower permanent magnet, and the piezoelectric ceramic piece is arranged in an annular cavity formed by the upper permanent magnet and the cutter bar shaft sleeve. According to the damping cutter bar, vibration can be suppressed when the coarse-pitch threads are turned, ever-changing current is generated by the piezoelectric ceramic piece due to cutting vibration and is transferred to theexciting coil through the coil lead, therefore, an ever-changing magnetic field can be generated by the exciting coil, so that the rigidity and damping of the magnetorheological fluid are quickly changed, the vibration reduction function is realized, and the surface quality of a to-be-processed workpiece is increased.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a vibration-damping cutter bar for turning large-pitch threads. Background technique [0002] During the metal cutting process, cutting chatter often occurs, and the cutting chatter will seriously affect the surface morphology and cutting precision of the workpiece. Especially in the process of turning large-pitch threads, due to the large cutting force generated by high-feed cutting, cutting chatter is also large, which seriously affects the surface quality of large-pitch thread parts. Aiming at the harm caused by this kind of vibration, scholars at home and abroad have done a lot of research on the mechanism of vibration generation and vibration suppression. Vibration suppression methods are mainly divided into three categories, active control, passive control and semi-active control. Among them, active control to suppress vibration has relatively high requirements on det...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a vibration-damping tool holder to improve the problem that the cutting chatter in the traditional cutting process seriously affects the surface quality and machining accuracy of the workpiece

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