Cutting-off apparatus

Abstract

An apparatus A for cutting off an unnecessary object deposited on a casting includes a motor having a rotary shaft 3 adapted to be rotated at a high speed, and a disk-shaped diamond tip saw 2 mounted at a tip end 4 of the rotary shaft 3 and adapted to be rotated by the rotation of the rotary shaft 3 to cut off the unnecessary object 9 on the casting 8, so that the tip saw 2 is rotated at a rotational speed in a range of 6,000 rpm to 8,000 rpm. Thus, the rigidity of the diamond tip saw 2 rotated at the high speed is increased by a centrifugal force provided by the diamond tip saw 2 itself and a gyroscopic moment effect to reduce the thickness of the diamond tip saw 2 can be reduced by a value corresponding to an increment in rigidity of the tip saw 2, whereby the amount of diamond tips (diamond blades) used can be decreased; an energy-saving for a cutting power can be achieved, and the amount of chips produced upon the cutting of the unnecessary object can be reduced.

What is claimed is:  
     
         1 . An apparatus for cutting off an unnecessary object deposited on a casting, comprising a rotary device having a rotary shaft adapted to be rotated at a high speed, and a disk-shaped diamond tip saw mounted at a tip end of the rotary shaft and adapted to be rotated by the rotation of the rotary shaft to cut off the unnecessary object on the casting, so that the tip saw is rotated at a rotational speed of 4,000 rpm or more, whereby the amount of diamond tip used can be reduced; an energy-saving for a cutting power can be achieved, and the amount of chips produced upon the cutting of the unnecessary object can be reduced to decrease the useless amount of a material for the casting.