The rock breaking process is divided into three parts, called the drilling pressure than the load of dental force per unit area. Drilling began, over load over load P and the mechanical drilling speed VM rock hardness is small, is proportional to the. At this point, cone bit can only be called "increases the surface load, gradually close to the rock, teeth, surface hardness values of each rock breaking process of rock properties, micro cracks, promote the drilling speed increased VM breaking several attacks on the teeth produced volume fragmenting rock place, has reached or exceeded the rock hardness, teeth each impact can be rock crushing amount, the amount of break.
To further improve the drilling pressure can shake the auxiliary scroll fragments. At this time, the bits in the rapid growth of the most effective rock crushing, therefore, in the selection of bit pressure, should avoid surface rupture, leading to low efficiency, while the highest volume fragmentation, will help increase the drilling pressure, improve the mechanical drilling speed, but there is a premise, it is necessary in the bearing capacity the optimal drilling pressure, influence each function, cone bit teeth to achieve auxiliary scroll fragments, bearing capacity of rock in the.