Method for cutting rare earth alloy with scroll saw and method for producing rare earth alloy plate

Abstract

A method for cutting a rare earth alloy according to the present invention includes the steps of: a) supplying slurry containing abrasive grains onto a wire; and b) machining the rare earth alloy with the abrasive grains, interposed between the wire and the rare earth alloy, by running and pressing the wire against the rare earth alloy. The slurry contains, as a main component, oil in which the abrasive grains are dispersed, and the viscosity of the slurry at 25 DEG C is in the range from 92 to 175 mPa . sec.

Description

technical field [0001] The present invention relates to a method of cutting a rare earth alloy with a wire saw, a method of manufacturing a rare earth alloy plate, a method of manufacturing a rare earth alloy magnet, and a voice coil motor having the rare earth alloy magnet. Background technique [0002] Japanese Unexamined Patent Application Publication No. 6-8234 reports the development of a technique of cutting an ingot with a wire saw in order to cut out a plurality of sheets from a silicon ingot. According to this technology, the blank is cut and cut while feeding the slurry containing abrasives to the moving multiple steel wires, and multiple sheets of a certain thickness can be cut at the same time. [0003] On the other hand, as a method of cutting a rare earth alloy billet, a technique of thinly cutting the billet with a rotating scribing plate has been used. However, in the method of cutting with a reticle, since the thickness of the cutting edge is larger than th...

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Problems solved by technology

[0005] However, there has been no report on cutting rare earth alloys with a practical wire saw technology.

According to the experiments of the present inventors, if the raw material of the rare earth alloy is cut with a wire saw, the fine powder and grinding debris (swarf or sludge) generated by the wire saw will be cut off in a very short time. The slurry circulation pipe is blocked, and as a result, the slurry cannot be supplied to the wire saw, and the wire is broken.

In order to avoid this problem, if the entire slurry is completely replaced every few hours, the processing with the wire saw must be interrupted every time the slurry is replaced, so it is not suitable for mass production and cannot be practical

In addition, sludge is easy to accumulate in the cutting groove, thereby significantly increasing the cutting resistance, and the wire breakage becomes easier

In addition, during the cutting process, sludge is easy to accumulate in the groove of the roller, and the phenomenon that the steel wire is often detached from the roller on which the steel wire is wound, etc., also causes a problem that the cutting accuracy is significantly reduced.

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