Method and apparatus for multiple cutoff machining of rare earth magnet block, cutting fluid feed nozzle, and magnet block securing jig

A cutting fluid feed nozzle for feeding a cutting fluid to a multiple blade assembly for multiple cutoff machining of a rare earth magnet block, said multiple blade assembly comprising a plurality of cutoff abrasive blades coaxially mounted on a rotating shaft at axially spaced apart positions, each blade of the plurality of cutoff abrasive blades comprising a core in the form of a thin disk or thin doughnut disk and a peripheral cutting part on an outer peripheral rim of the core, wherein

• said feed nozzle consists of
• a hollow nozzle housing forming a fluid distributing reservoir, and
• a cutting fluid inlet consisting of one conduit at the center of a back portion of the hollow nozzle housing, wherein
• a plurality of slits corresponding to the plurality of cutoff abrasive blades are formed at a front portion of said hollow nozzle housing,
• wherein the front portion of said hollow nozzle housing has an upper wall tapered toward distal end of each slit of the plurality of slits and a bottom wall so that the hollow nozzle housing is thinner at the distal end and the plurality of slits are formed only in a partial portion of the tapered portion of the front portion of said hollow nozzle housing,
• wherein an outer peripheral portion of each of the plurality of cutoff abrasive blades is inserted in the corresponding slit, and
• wherein the cutoff abrasive blades contact with the cutting fluid in the fluid distributing reservoir.

A cutting fluid feed nozzle for feeding a cutting fluid to a multiple blade assembly for multiple cutoff machining of a rare earth magnet block, said multiple blade assembly comprising a plurality of cutoff abrasive blades coaxially mounted on a rotating shaft at axially spaced apart positions, each blade of the plurality of cutoff abrasive blades comprising a core in the form of a thin disk or thin doughnut disk and a peripheral cutting part on an outer peripheral rim of the core, wherein

• said feed nozzle consists of
• a hollow nozzle housing forming a fluid distributing reservoir, and
• a cutting fluid inlet consisting of one conduit at the center of a back portion of the hollow nozzle housing, wherein
• a plurality of slits corresponding to the plurality of cutoff abrasive blades are formed at a front portion of said hollow nozzle housing
• wherein the front portion of said hollow nozzle housing has an upper wall tapered toward distal end of each slit of the plurality of slits and a bottom wall that is opposite to the upper wall;
• wherein the hollow nozzle housing is thinner at the distal end;
• wherein each slit of the plurality of slits forms an opening from a portion of the upper wall completely through a portion of the bottom wall in the front portion of said hallow nozzle housing,
• wherein an outer peripheral portion of each of the plurality of cutoff abrasive blades is inserted in the corresponding slit, and
• wherein the cutoff abrasive blades contact with the cutting fluid in the fluid distributing reservoir.