Mechanical rotating type pulse magnetic field generator used for magneto-rheological polishing

Abstract

The invention provides a mechanical rotating type pulse magnetic field generator used for magneto-rheological polishing. The mechanical rotating type pulse magnetic field generator mainly comprises amagnet disc rotating mechanism and a magnet disc vertical direction adjusting mechanism. The magnet disc rotating mechanism comprises a driving motor, a rotating shaft, a motor support, a magnet discand a permanent magnet cluster. The permanent magnet cluster is fixedly installed on the magnet disc and generates a magnetic field required for polishing; the magnet disc is fixedly connected with the rotating shaft; the driving motor drives the rotating shaft to rotate, and the rotating shaft drives the magnet disc to rotate; and the magnet disc vertical direction adjusting mechanism is fixedlyconnected with the magnet disc and drives the magnet disc to move up and down. According to the mechanical rotating type pulse magnetic field generator, large-area polishing areas can be evenly formed; by rotating the magnet disc, the static magnetic field is converted into a dynamic pulse magnetic field; and a magnetic chain in a flexible polishing head can be forced to be rearranged so as to achieve rapid regenerating of abrasive particles, the contact frequency of the abrasive particles and the surface of a workpiece is increased, the abrasion speed of the abrasive particles is reduced, andthe polishing efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of ultra-precision machining, in particular to a mechanical rotary pulse magnetic field generator for magnetorheological polishing. Background technique [0002] The magnetorheological polishing technology uses the rheological properties of the magnetorheological polishing fluid in a magnetic field for polishing. The magnetorheological polishing fluid will undergo a rheological phenomenon in a gradient magnetic field to form a viscoplastic Bingham (Bingham) flexible protrusion. , when the flexible protrusion is in contact with the surface of the workpiece to be processed and moves relatively, a large shear force will be generated on the surface of the workpiece, and the shear force will remove the material under the action of abrasive particles in the magnetorheological polishing fluid. [0003] Magnetorheological polishing technology is a new type of optical surface processing method proposed by Kordonski a...

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Problems solved by technology

[0005] The disadvantage of the magnetorheological polishing method in the above-mentioned prior art is: when the magnetorheological fluid moves with the polishing disc to the vicinity of the concave space formed by the workpiece and the polishing disc, a flexible raised "polishing ribbon" is formed, but the "polishing satin" The belt” and the surface of the workpiece belong to the local contact of “spots”. In the process of processing, the entire surface can only be processed by controlling the “spots” and scanning along the workpiece surface according to a certain trajectory. The trajectory scanning process requires a lot of time, resulting in low polishing efficiency. , The problem that the processing shape accuracy is not easy to guarantee

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