A composite magnetic field type magnetorheological polishing head

Abstract

The invention discloses a composite magnetic field type magnetorheological polishing head. The composite magnetic field type magnetorheological polishing head comprises a transmission shaft, a workpiece, a polishing head, a left iron core, a magnet exciting coil, a neodymium iron boron magnetic shoe, a left magnetic separation plate, magnetorheological fluid, a right magnetic separation plate, a right iron core and an infusion pipe; the polishing head is mounted in the center position of the inner wall of the workpiece; two ends of the polishing head are in threaded connection with the transmission shaft and the infusion pipe; the polishing head is driven by the transmission shaft to perform a high-speed rotating motion relative to the inner wall of the workpiece; and the workpiece performs a linear reciprocating motion relative to the polishing head. The composite magnetic field type magnetorheological polishing head is simple in structure; an electromagnet and a permanent magnet arecombined to serve as a magnet exciting device of magnetorheological polishing; when enough magnetic filed intensity is provided, the magnet exciting device is less in occupied space and low in heatingquantity; the accurate adjustment of the magnetic field intensity of a polishing area can be realized; and in particular, the polishing head is suitable for inner wall polishing of slender non-magnetic conducting pipe fittings.

Description

technical field [0001] The invention designs a polishing head, and in particular relates to a composite magnetic field type magnetorheological polishing head for processing the inner wall of a slender non-magnetic pipe. Background technique [0002] Magneto-rheological polishing is an emerging ultra-precision machining technology. It uses the rheological properties of magnetorheological fluid under the action of a magnetic field to polish the surface of the workpiece. It has the advantages of good controllability, stable material removal and good polishing effect. Under the action of the gradient magnetic field, the apparent viscosity and shear yield stress of the magnetorheological fluid increase rapidly, forming a flexible polishing mold that matches the surface to be processed. Shear to remove. The hardness of the polishing die can be controlled according to the strength of the magnetic field. In a certain range, the yield stress of the magnetorheological fluid increases...

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Problems solved by technology

[0003] The electromagnetic magneto-rheological polishing head disclosed in Chinese patent (publication number CN 1486821A) uses an electromagnet as the excitation device for magnetorheological polishing. The magnetic field strength in the polishing area can be changed by changing the excitation current. The control is simple and convenient, but the electromagnetic Iron takes up a lot of space, and with the increase of polishing time, the electromagnet heats up seriously and easily affects the polishing effect, so a special cooling mechanism needs to be designed

Chinese patent (publication number CN 106736879A) discloses a roller-type magnetorheological polishing device and method, which uses permanent magnets as the excitation device for magnetorheological polishing and is installed in the polishing shaft. The permanent magnets occupy a small space and will not There is a heating problem, but it is difficult to accurately adjust the magnetic field strength in the polishing area. The magnetic field strength in the polishing area can only be adjusted indirectly by adjusting the distance between the permanent magnet and the inner wall of the polishing shaft or the distance between the outer wall of the polishing shaft and the polished surface of the workpiece. The controllability is poor.

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