The invention relates to a diamond tip disk saw that does not vibrate during high-speed rotation, enhance the quality of the cut surface, and increase the durability of the saw. The diamond tip disk saw according to the invention comprises of a metal disk having a shaft hole and a plurality of diamond tips on both sides of the periphery. In between the shaft hole and the diamond tips, the saw is provided with a plurality of corrugations forming substantially sinusoidal waves on both sides of the saw. A greater efficiency is obtained when the corrugations are formed in a convex arc coming out of the disk surfaces.

A diamond saw for cutting hard materials, in which a steel plate is fixed with a sintered abrading body consisting of diamond abrasive granules and a bonding metal powder, characterized in that a plurality of grooves are provided on the surface of both the front and back side faces of the sintered abrading body.

In the method for manufacturing a super abrasive cutting saw, press molds are formed with uneven portions on the main opposite surfaces. The molds define a space portion for containing the periphery of a cutting saw plate. Two masses of compressed sinterable powders are prepared. The two masses of compressed powder are brought to oppose each other while holding the periphery of the cutting saw plate therebetween for engagement. The press molds are engaged to press and hold the masses. Heating the compressed powder to sinter while pressing the same fuses the two masses of compressed powder together and to the cutting saw plate and forms a sinter around the periphery of the cutting saw plate. An apparatus used in the method of manufacturing the super abrasive cutting saw includes the space portion for containing at least the periphery of the cutting saw plate and the pressed powder. The molds defining the space portion are formed with uneven portions on their main surfaces for engaging to the main surfaces of the compressed powder sinter and forming corrugations therein.

Diamond cutting tools such as a diamond core drill and a disk-shaped diamond saw which are used to grind and cut hard articles in order to bore or cut hard articles. The diamond cutting tools comprise a tool body and a diamond blade portion attached to an outer end of the tool body. The diamond blade portion has a plurality of outer cuts formed at an outer end thereof and a plurality of inner slots formed under and between the outer cuts and higher than the bottoms of outer cuts by a certain depth. The diamond cutting tools can carry out effectively boring or cutting work until the expensive diamond blade portion is completely worn away.

A super abrasive cutting saw includes a cutting saw plate formed with concave sections in spaced relation around its periphery. The concave sections alternate with convex sections. Each successive convex section is bent outward toward the opposite surface of the cutting saw plate from the next convex section. A sinter is bonded to the periphery of the cutting saw blade by heating two bodies of a compressed powder formed of material which includes super abrasives and pressing them on the saw plate to be sintered there. Concave and convex portions of the two bodies are formed fused so that the convexities of each oppose the concavities of the other. The border thus formed is extended in zigzag fashion in the direction of thickness of the cutting saw plate corresponding to concave and convex sections thereof. The concave sections of the periphery of the cutting saw plate are deep enough and the inner rim of the sinter is placed for defining holes through the plate for plate cooling and air turbulence generation.