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Superhard cutting tools for hard turning using this technology after ten years of development and promote the use of, access to a huge economic and social benefits. The following roll processing industries to illustrate the production of super-hard tool in the promotion of the application.
Roll processing industry
Many large domestic enterprises roll superhard tools used for chilled cast iron, hardened steel and other types of rolls shortage of cars, roughing and fine cars, have achieved good results on average seven to improve processing efficiency 2-6 times, saving processing work and power of 50% to 80%. Such as Wuhan Iron and Steel Company plant on the roll hardness HS60 ~ 80 chilled cast iron rolls roughing, semi-finishing car, cutting speed increased 3 times, each car a roll, save electricity, time charge for more than four hundred yuan, saving tool costs nearly hundred dollars, has made tremendous economic benefits. When I use the FD22 as school 86CrMoV7 cermet cutting tools for turning hardened steel rolls HRC58 ~ 63's (Vc = 60m / min, f = 0.2mm / r, ap = 0.8mm), a single continuous cutting edge roll path up 15000m (tip flank wear with a maximum width VBmax = 0.2mm), in order to meet the requirements of the car instead of grinding.
Industrial pumps processing industry
At present 70% to 80% of the domestic ballast pump manufacturing plant has been used superhard tools. Ballast pump is widely used in mining, power and other industries, is home need a product, its sheath, shield is HRC63 ~ 67 of Cr15Mo3 high-hard cast iron. In the past due to a variety of tools for turning this material is difficult, so had to resort to soften rough after annealing, quenching and then processing technology. After the use of super-hard tools, successfully achieved a hardening process, eliminating the annealing rehardened two processes, saving a lot of man-hours and electricity.
Car processing industry
Crankshafts in cars, tractors and other industries, the camshaft, drive shaft machining, cutting tools, measuring and processing equipment maintenance, often encounter difficulties hardened workpiece machining. As of a Locomotive Plant, equipment maintenance is required for processing the bearing inner ring, the bearing inner ring (material GCr15 steel) hardness of HRC60, the inner diameter of f285mm, using the grinding process, uneven grinding allowance, 2h need to wear good; but first with superhard tools, only 45min to be processed into an inner ring.
After years of research and exploration, China has made great progress in terms of superhard cutting tool, however, superhard tools used in production is not widespread. The main reasons are the following aspects: production enterprises, the operator of the use of super-hard tool to understand the effect of turning hard enough, generally considered only grinding hard materials; that the tool cost is too high. Hard turning initial tooling costs higher than normal carbide tools (such as PCBN ten times more expensive than ordinary carbide), but its share in the cost per part is lower than grinding and benefits than the average carbide is much better; for superhard cutting tools mechanism is not enough; specifications superhard cutting tools are insufficient to guide the production practice.
Therefore, in addition to super hard tool-depth study of the mechanism, but also the need to strengthen the superhard tools.