Abstract:enerally, the view is held that a diamond tool cuts rock by bulk crushing and shearing orplowing. Thus it is required that diamonds should be evenly distributed on the whole workingsurface of the tool without any blank space. If there is blank space, tracking or grooving willoccur, and so this will result in the abnormal damage of the tool. After theoretical analysis andseveral years test, that a new diamond cutter has been successfully developed and achieved goodeffect makes a breakthrough in above conventional opinions.When a diamond tool cuts rock, an individual diamond under enough load cuts' rock by bulkcrushing, and under rotation force shears or plows rock. Every diamond penetrates rock creating a crater whose volume is about 3 times larger than that of a diamond grain. The greatercrack propagation around the crater gets the rock weaker, and vibration of the butting tool caneasily strip it off. Therefore, concentration and distribution of the diamond on the tool surfaceshould be controlled reasonably in light of rock properties, diamond size and quality so as totake advantage of pitting or cratering effect fully and improve rock cutting efficiency.On the whole, impregnated diamond layers and their spacings should be designed reasonably in the new cutting tool so that when it cuts rock, it can sweep out a set of cutting tracks(kerfs) that are separated by ribs of uncut material, the uncut ribs whose strength is very lowbecause of great crack propagation resulting from pitting or cratering effect will be easily removed by mechanical vibration.The new tool cuts rock by crushing and shearing supplement with mechanical vibration andcratering effect, so it is easier to achieve the goal of high penetration rate, long life and lowcost. The technology can be applied in the manufacture of diamond bits and saws as well as oth.er rock cutting tools.
