Magneto-rheological polishing device and method based on flow field focusing

Abstract

The invention belongs to the field of polishing of ultra-precision optical elements, and in particular discloses a magneto-rheological polishing device and method based on flow field focusing. The magneto-rheological polishing device comprises an end cover, a sleeve, a polishing head shell and a magnetic isolating rotation shaft, wherein the end cover and the polishing head shell are connected with the two ends of the sleeve, and a liquid inlet and a liquid outlet are formed in the polishing head shell; the magnetic isolating rotation shaft is arranged in the sleeve, one end of the magnetic isolating rotation shaft penetrates through the end cover to be connected with an external rotating power source, and the other end of the magnetic isolating rotation shaft is inlaid with a permanent magnet and is inserted into the polishing head shell to form a flow focusing chamber with the inner part of the polishing head shell; and the liquid outlet is positioned directly below the permanent magnet. During polishing, one part of magneto-rheological polishing fluid forms a bingham body under the action of permanent magnet at the end face of the magnetic isolating rotation shaft; and the otherpart of the magneto-rheological polishing fluid flows in the flow focusing chamber and is ejected from the liquid outlet, and the part generates hydrodynamic pressure to extrude the bingham body forshaping during flowing, so that a small bingham body polishing head with the average diameter less than the diameter of the liquid outlet is formed. The magneto-rheological polishing device and methodrealize efficient polishing of workpieces with different surface shapes.

Description

technical field [0001] The invention belongs to the field of ultra-precision optical element polishing, and more specifically relates to a magnetorheological polishing device and method based on flow field focusing. Background technique [0002] Ultra-precision optical components are widely used in military, aerospace, astronomy, nuclear energy and important economic industries. These components have high requirements for surface quality and surface accuracy. As a non-contact polishing technology, magnetorheological polishing uses the rapid relative movement between the flexible polishing mold with viscoplastic behavior formed by the flow of magnetorheological polishing fluid in the gradient magnetic field and the workpiece, resulting in microcutting. Function to realize non-contact polishing of components. The shape and hardness of the polishing mold of this polishing technology are completely controlled by the magnetic field, and the polishing mold is continuously updated...

AI Technical Summary

Problems solved by technology

However, when the size of the magnetic tube is small, an effective gradient magnetic field cannot be formed, and t...

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