Abstract: A method of cutting a rare-earth alloy with a wire 20, on which abrasive grains are fixed with a resin layer provided on the outer surface of a core wire, includes the steps of: providing a wire, of which the surface is coated with a lubricant including a glycol, by reeling the wire up in a pair of reel bobbins 40a and 40b; reeling the wire off one of the reel bobbins and letting the wire travel on a plurality of rollers 10a, 10b and 10c; and cutting the rare-earth alloy with the traveling wire while a portion of the rare-earth alloy being cut with the wire is supplied with a first coolant which is mainly composed of water. As a result, the life of a wire can be extended when a rare-earth alloy is cut with a wire saw machine using a coolant which is mainly composed of water.

Abstract: A method for cutting a rare earth alloy using a wire with abrasive grains fixed to a core wire, including the step of cutting the rare earth alloy with the wire traveling in a state that a portion of the rare earth alloy to be cut with the wire is immersed in a coolant containing water as the main component, the coolant having a surface tension at 25° C. in a range of 25 mN/m to 60 mN/m.

Abstract: A work cutting apparatus comprises a bed. The bed has an upper surface provided with a column including a rail slidably mounted with a slider. The slider has a front surface mounted with a supporting portion supporting two end portions of a rotating shaft. The rotating shaft is mounted with a plurality of cutting blade blocks. Each of the cutting blade blocks includes a plurality of cutting blades and a thicker cutting blade at each end of the cutting blade block. A table provided with a recess having a V-shaped section is disposed on the bed right beneath the cutting blade blocks. A plurality of works are disposed in the recess, each fixed by a fixing member. The cutting blades lowered while rotating, thereby cutting the works. During this operation, coolant is discharged from a plurality of supplying ports of a coolant supplying portion as well as from a supplying port of a coolant supplying path.

Abstract: A work cutting apparatus comprises a bed. The bed has an upper surface provided with a column including a rail slidably mounted with a slider. The slider has a front surface mounted with a supporting portion supporting two end portions of a rotating shaft. The rotating shaft is mounted with a plurality of cutting blade blocks. Each of the cutting blade blocks includes a plurality of cutting blades and a thicker cutting blade at each end of the cutting blade block. A table provided with a recess having a V-shaped section is disposed on the bed right beneath the cutting blade blocks. A plurality of works are disposed in the recess, each fixed by a fixing member. The cutting blades lowered while rotating, thereby cutting the works. During this operation, coolant is discharged from a plurality of supplying ports of a coolant supplying portion as well as from a supplying port of a coolant supplying path.

Abstract: A method for polishing and chamfering a rare earth alloy including the steps of: preparing rare earth alloy work, feeding the rare earth alloy work, ball media, a liquid medium, and spacer particles (in an amount of 0.1% to 10% by volume of the liquid medium) into a container, and subjecting the rare earth work to polishing by vibrating the container.

Abstract: The invention provides a method of machining a rare earth alloy at high machining preciseness and high efficiency. In a step of grinding a block of a rare earth alloy with a grinding wheel having, on a peripheral portion thereof, a grinding edge including diamond abrasive particles, a coolant with surface tension of 25 mN/m through 60 mN/m is supplied to the grinding edge with the grinding wheel rotated.

Abstract: A work cutting apparatus comprises a plurality of cutting blades each including a metal plate phase containing a super hard abrasive grain dispersed entirely thereon. A work made of a rare-earth alloy magnet member is submerged in a coolant in a container. The work submerged in the coolant is cut by rotating the cutting blades at a high speed not slower than 8000 rpm and by moving the cutting blades to the work vertically or along a normal line passing a tangential point between the cutting blade and the work. The coolant may be supplied from a hose to a cutting region at a time of the cutting. At the time of cutting, the work is vibrated in a direction parallel to a main surface of the cutting blade and perpendicular to a direction of the cutting. Preferably, the cutting blade has a tip portion formed with a cutout, and a spacer including two main surfaces each having an outer circumferential portion formed with an annular stepped portion is inserted between the cutting blades.

Abstract: A method for cutting a rare earth alloy of the invention using a wire having abrasive grains stuck thereon is disclosed. The method includes the step of cutting the rare earth alloy while supplying a cutting fluid having a predetermined kinematic viscosity between the wire and the rare earth alloy. The method further includes the step of varying the temperature of a supplied amount of fresh cutting fluid in order to control the kinematic viscosity of the cutting fluid.

Abstract: A method for cutting a rare earth alloy using a wire with abrasive grains fixed to a core wire, including the step of cutting the rare earth alloy with the wire traveling in a state that a portion of the rare earth alloy to be cut with the wire is immersed in a coolant containing water as the main component, the coolant having a surface tension at 25° C. in a range of 25 mN/m to 60 mN/m.

Abstract: A method for polishing and chamfering a rare earth alloy including the steps of: preparing rare earth alloy work, feeding the rare earth alloy work, ball media, a liquid medium, and spacer particles (in an amount of 0.1% to 10% by volume of the liquid medium) into a container, and subjecting the rare earth work to polishing by vibrating the container.

Abstract: A magnet member cutting apparatus comprises a temperature controller for temperature control of a coolant. The coolant at a temperature controlled by the temperature controller is supplied to a cutting region from a coolant discharging device via a coolant supplying path. While the coolant is supplied to the cutting region, a magnet member which is a sintered rare-earth magnet member is cut by a cutting blade having a cutting edge including a mixture of abrasive grain made of a super hard abrasive grain and heat resistant resin made of a phenol resin. Preferably, the coolant is used in circulation, the coolant temperature is maintained at 20° C.˜35° C., the cutting blade rotating speed is 1000 m/min˜3000 m/min, a volume rate of the abrasive grain to the cutting edge is 10%˜50%, and the cutting edge further includes metal powder.

Abstract: A working apparatus of a magnet member comprises: a transfer path for guiding magnet members to be ground in one direction; transfer means for pushing the plurality of magnet members in a transfer direction to continuously send out the magnet members to the transfer path; a pair of grinding means disposed such as to sandwich the transfer path for grinding opposite surfaces of the transferred magnet member; and pushing means disposed downstream from the grinding means for pushing the magnet member in a direction opposite from the transfer direction. With this structure, it is possible to work the magnet member into a predetermined shape with excellent productivity.

Abstract: A work chamfering apparatus includes a work holding portion. The work holding portion includes a work table and a clamper. The work table has an upper surface having two end portions each formed with holding grains projecting out of the upper surface. The two end portions of the upper surface of the work table have a static friction coefficient greater than 0.1, which is greater than that of a center portion. When chamfering, first, the work is held by the work table and a generally U-shaped member of the clamper. At this time, the two end portions of the upper surface of the work table contact a lower surface of the work, whereas lower surfaces of respective end portions of the U-shaped member contact an upper surface of the work. In this state, a rotating center of the work is between the lower surfaces, and the lower surfaces are apart generally equally from the rotating center.