The improvement of cutting tool performance provides the possibility of high-efficiency and high-speed machining development. In addition to high-speed steel and hard alloy, the development of super-hard materials plays an important role. PCD and PCBN have created conditions for cutting, dry cutting, and hard cutting of difficult-to-machine materials.

In order to meet the needs of high-speed crankshaft machining, high efficiency, and dry cutting, a large number of coated tools are currently used. The coating material has been developed from TiN to A12O3, TiC, ZrO2, etc. According to the processing requirements, in order to improve the high temperature resistance, TiCN, TiAlN, TiSiN, CrSiN and the like have been developed. Now PVD (Physical Vapor Deposition) and CVD (Chemical Vapor Deposition) technologies are constantly evolving, from single layer to multi-layer, one-layer, composite coating, and now developed into nano-coating; deep oil hole processing using gun drilling Instead of ordinary lengthened high speed steel drill bits, drilling and tapping replace the past high speed steel materials with cemented carbide materials. At present, the finishing of the crankshaft is gradually starting to use CBN grinding wheel. The CBN grinding wheel is expensive, but due to the high processing efficiency and durability, the cost of the tool allocated to each workpiece is lower than that of the ordinary grinding wheel which is inexpensive. According to the data, the processing time of CBN grinding wheel can usually be shortened by 50%, and the processing cost can be saved by more than 50%.