Multi-motion overlapped high-magnetic-path magneto-rheological polishing device and method

Abstract

The invention relates to a multi-motion overlapped high-magnetic-path magneto-rheological polishing device and method. A polishing head is composed of a spindle, a clamp and a magnet arranged in the clamp; the device is capable of revolving while horizontally reciprocating under the driving of a driving mechanism of the polishing head arranged on a workbench; a polishing disc filled with a magneto-rheological fluid is located on the lower part of the polishing head; the polishing disc is driven to revolve by a polishing disc motor in a motor box; and a clearance between the polishing disc and the bottom of a workpiece is adjusted by a lifting platform arranged on a base platform. The application of the device for polishing has the advantages of wide magnetic path scope, high magnetic field uniformity, overlapping of multiple motion interferences in polishing active area of the workpiece, convenience in updating the magneto-rheological fluid in the polishing area, easiness in draining the processing chippings, long polishing stroke, and the like; the micro-texture track on the surface of the polished workpiece is complex; the uniformity is high; and the polishing quality is high.

Description

technical field [0001] The invention relates to polishing device equipment and technology, in particular to a device and method for polishing workpieces by using magnetorheological fluid. Background technique [0002] Aiming at a series of problems such as the corrosion of the outer surface of the workpiece in the traditional polishing method, which may easily cause serious subsurface damage, polishing liquid pollution, high production cost, low efficiency and high scrap rate, a magnetorheological method has emerged in the field of ultra-precision machining in recent years. Polishing process. It is by adding an appropriate amount of polishing micropowder to the magnetorheological fluid, using the magnetorheological fluid to solidify under the magnetic characteristics, forming a certain hardness and elasticity in the processing area, which can withstand large shear stress, and polish the workpiece. As a new type of intelligent polishing technology, magnetorheological polishi...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing magnetorheological devices have three technical problems that affect the processing quality of the workpiece to varying degrees: one is that the coverage of the magnetic circuit is small, and the magnetic field is uneven, which makes the uniformity of the micro texture on the surface of the workpiece unsatisfactory; the other is that There is less movement interference and superposition of the polishing device, and the microscopic texture track formed on the surface of the workpiece is single; third, because the magnetic field cannot move in the direction parallel to the polishing surface, the exchange of magnetorheological fluid in the polishing processing area is not smooth, so that the processing debris cannot Timely discharge, resulting in poor polished surface integrity

This method is a point contact polishing method, which removes the material of the contact part between the surface of the workpiece and the magnetorheological fluid. The hardness of the polishing tool formed after the liquid is solidified is not uniform, the processing effect is not good, and the efficiency of polishing workpieces with large processing surfaces is low

This method adopts surface contact polishing. Although it has the advantages of large magnetic circuit coverage and high processing efficiency (multiple workpieces can be processed at the same time), it also has disadvantages: because only the table rotation and grinding tool rotation are in the effective polishing area of ​​the workpiece. (The grinding tool only rotates itself after adjusting the X-direction position, and does not reciprocate.) The interference superposition of the two types of motion, plus the unequal linear speed of each workpiece on the rotary table, makes the grinding removal rate not uniform enough. , easy to form defects such as single microscopic texture track on the processed surface and poor surface homogenization

The Bingham body formed by this method (cluster magnetorheology) is a large-area plate-shaped structure, and the magnetic circuit covers a large area of ​​the workpiece polishing area, but the solid-liquid exchange of the magnetorheological fluid in the polishing processing area is not smooth, and the workpiece processing debris It is easy to remain on the surface of the Bingham plate and cannot be discharged, which will affect the polishing quality of the workpiece

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