Variable-stiffness variable-damping magnetorheological fluid vibration reduction boring bar

Abstract

The invention discloses a variable-rigidity variable-damping magnetorheological fluid vibration reduction boring bar, and relates to the technical field of cutting machining. The problem that vibration generated in the machining process of an existing boring rod affects the machining precision and the machining efficiency is solved. The boring rod comprises a tool bit connecting block, a coil, a cylinder body, a rod body, a cylinder cover, a cantilever beam, an iron core, a telescopic rod, a sliding block, a lead screw, a stepping motor and a control system, the cylinder body is inserted in a cavity of the boring rod, the iron core is arranged in the cylinder body, a gap is formed between the iron core and the inner side wall of the cylinder body, the iron core is fixedly connected to the end of the rear end of the cantilever beam in a sleeving mode, and the coil is embedded in the outer side of the iron core; the cylinder body is filled with magnetorheological fluid, the telescopic rod is inserted into the rod body, the front end of the telescopic rod is arranged in the boring rod cavity and perpendicularly and fixedly connected with the rear end of the cylinder body, the front end of the lead screw is in threaded connection with the rear end of the sliding block, the rear end of the lead screw is fixedly connected with an output shaft of the stepping motor, and the rear end of the telescopic rod is arranged in the groove and fixedly connected with the front end of the sliding block. The boring cutter is used for boring.

Description

technical field

[0001] The invention relates to the technical field of cutting processing, in particular to a variable stiffness variable damping magnetorheological fluid vibration damping boring bar. Background technique

[0002] In metal cutting processing, inner hole processing accounts for about 33% of the total processing, among which ultra-deep hole processing mostly involves major fields such as aerospace and energy equipment.

[0003] Boring tools are widely used in deep hole machining. However, due to the low rigidity of the cantilever beam structure of the boring bar, vibration often occurs when the long diameter of the boring bar is relatively large, and during the boring process, the boring bar needs to extend into the To process inside the workpiece, the working conditions are closed, and the real-time machining state of the boring bar cannot be directly observed. The contact between the boring bar and the workpiece is more complicated under the action of vibrat...

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