A dynamic damping boring bar with variable stiffness and single degree of freedom

Abstract

The invention discloses a variable-stiffness single-degree-of-freedom dynamic damping boring rod. The variable-stiffness single-degree-of-freedom dynamic damping boring rod comprises a boring rod front half part and a boring rod rear half part, wherein the boring rod front half part is connected with the boring rod rear half part; a cavity is formed in the boring rod front half part; a mass blockis arranged in the cavity; a rubber hose is spirally wound on the mass block; an axial hole is formed in the rear end surface of the mass block; a radial hole is formed in the side wall of the rear end of the mass block; the axial hole communicates with the radial hole; one end of the rubber hose is fixedly arranged at the front end of the mass block, and is wound to the rear end of the mass blockin the length direction of the mass block; after passing through the radial hole and the axial hole, the rubber hose extends out of the mass block; and an end cap is arranged between the boring rod front half part and the boring rod rear half part. The rubber hose is charged with liquid, so that a pressure intensity regulating structure is realized; and an outside control system is not required,so that liquid of different pressure intensities only needs to be led into the rubber hose only through a hydraulic pump, and therefore, implementation is simple, and cost is relatively low.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and relates to a dynamic damping boring bar with variable stiffness and single degree of freedom. Background technique [0002] Deep hole machining plays an important role in metal cutting. As a subclass of deep hole machining, deep hole boring has broad application prospects. However, for deep hole components, the diameter and overhang of the boring bar are limited by the deep hole being processed, which requires that the diameter of the boring bar must be smaller than the hole diameter, and the overhang must be long enough. However, with the increase of the length-to-diameter ratio of the boring bar, its rigidity will be rapidly weakened, which will lead to an increase in the amplitude of cutting chatter. The enhancement of cutting chatter will reduce the processing quality, resulting in unacceptable surface finish and dimensional errors, forcing the staff to reduce cutting parameters to c...

AI Technical Summary

Problems solved by technology

For the method of extruding elastic components, there is no precise correspondence between the change of stiffness and the degree of extrusion, and the range of change is small, so only fine adjustments can be made; for the method of cantilever beams, the relationship between stiffness and cantilever length is clear, and the adjustment range is large, but Limited by the size of the cavity containing the mass block in the boring bar; for magnetorheological fluid, the damping and stiffness changes can be precisely controlled and the response is fast, but the magnetorheological fluid is expensive and requires an external control system to change the magnetic field strength, and the device is complex ,higher cost

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