Cone bit is a bit slow, thatcone speed is smaller than the speed of the drill, mainly scraping broken rock, suitable for high speed, high WOB sidetracking of old wells, old wells deeperwells, etc. Eye drilling operations play an important role in the drilling. Cone bit advantages: relatively wide application field, not only for sidedrilling, and can be used in deep wells, the drilling has demonstratedimportant advantages.
Tricone bit must take into account the quality of thematerial of the capital and the strength of the set period, the mold materialselection is necessary to meet customers production of wind-induced volumerequirements.
While still under the mold tricone bit example, the useof things essentials, processing speed, tension, etc. due to failure of thesituation has always been selection. For example: Die tension failure situationis edge wear, we must select high hardness, good wear resistance material; stamping die tension suffered cyclic loading, easy to cause appearance offatigue crack, causing the surface peeling, then to choose looks good toughnessmaterial; drawing die should choose particularly low coefficient of friction ofthe material; casting mold due to cyclic thermal stress, it should choose astrong thermal fatigue of the material; deal with injection mold, when thethree-cone drill, the mold material optional pre-hardened quenched and temperedsteel, when the plastic parts for the high-quality finish, transparentmaterial, the optional corrosion resistant stainless steel, when largequantities of goods, you can choose quenched and tempered steels. Also it isnecessary to consider the acceptance and other parts of the mold materialsmaller affinity to intensify anti-sticking mold parts wear, thus affecting thequality of the mold.