As a craft, hard part turning has developed ahead, already can answer nowadays convention and new appearing demand. Challenge: How to optimize hard part turning afresh? Solution: The basis already had operand to occupy, correct application is newest bit brand and chamfer. From 20 centuries 80 time metaphase gets be popularizinged extensively since, hard part turning (HPT) had obtained great progress as craft of a treatment. In data of mechanical, hardware, quench turning sets cutting tool of craft, cutting and complete hard part the development that waits for a domain, had made hard part turning makes an efficient process, be mastered by any job shops place. Hard part turning has a lot of profit, because this is necessary,the applied circumstance of hard to involving a circle for the most part part undertakes an analysis. Although do not answer,regard hard part turning as all grinding process replace a method, but the occasion uses in some, these two kinds of craft can supplement each other truly. Cubic nitrogen changes boron to be able to reduce periodic time, increasing quality and the main good point that produce turning of efficiency hard part is: Get used to complex spare parts external form easily a variety of spare partses can be in quick switch sheet undertakes purify of metal of many working procedure is led in second setting high-energy the machine tool of lathe of calculator numerical control that when using test run turning quite, uses invests low metal to cut bits to be helpful for environmental great majority do not need to use cooling fluid utmost below the circumstance. Cubic nitrogen changes boron (CBN) it is to use data of the most extensive cutting tool of hard part turning, because it satisfied the requirement that place of circumstance of great majority application raises,this is. It has very tall hardness (be next to diamond) , can be united in wedlock with the bit brand photograph with differ toughness. The cubic nitrogen that there already were a variety of new developments nowadays changes name of boracic razor blade, can satisfy all sorts of process that develop increasingly to ask, for example precision work of cutting speed, feed, successive cutting and interrupted cutting, outside and all sorts of operating mode. The tall cutting that machining an area centrally generates very high pressure after force and high temperature union, because this is in hard part treatment, cutting tool tatty basically is behaved is cutting crescent moon appears to wear away depression on blade. It is exclusive that hard cubic nitrogen changes boron the cutting tool stuff that can achieve these requirements and has reasonable toughness. The newest development that cubic nitrogen changes boracic name already wore away for further restriction provided a measure, still can improve point security at the same time, enlarge applied limits, raise cutting speed to amount to 20% the left and right sides. Producing consistency of efficiency, quality and technology reliability is the basic standard of turning of current hard part. Because hard part turning already developed to use extensive technology into, have the advantage that has precision work to the spare parts after heat treatment, accordingly, in treatment efficiency respect already raised a variety of requirements. Because manufacturing efficiency is an increasingly main factor in treatment of current hard part, cutting tool development had main effect. Development trend includes to raise cutting rate (some brands can amount to 200 meters / minute above) , prolong cutting tool life, and improve cutting tool life can forecast a gender. Feed rate also got rising, mix through bit intensity groove development, achieve shorten the purpose of cutting time. Bit brand is becoming increasingly good, in order to achieve the operation requirement of current cutting domain. Cubic nitrogen changes boracic name is first selection normally, it is brand of pottery and porcelain next, optimized all sorts of application demand thereby: The successive cutting that CB7015 suits to machine operating mode to stabilize comes light-duty now and then interrupted cutting, basically use at case hardening steel. CB7025 suits longer successive cutting to come more heavy-duty interrupted cutting, often be a characteristic in order to cut into operating mode difference, if burr and blame are inclined,cut corner, basically use at hard steel of temper by dipping in water. CB7050 suits difference of spare parts appearance great put possibly in serious twist, perhaps have blame tilt discontinuous astringent operating mode, basically use at hard steel of temper by dipping in water. GC6050 is the name of pottery and porcelain that changes boron to supplement each other with cubic nitrogen in certain operation, suit the light-duty and successive finish machining below good operating mode, basically use at exterior quality to be not crucial case hardening steel. If want to undertake parallel or perpendicular Yu Ling the treatment of central line, the Xcel razor blade that the hard part turning of case hardening spare parts should introduce CB7015 series is in bit chamfer respect, because must have very high point strength, the cutting blade of razor blade of hard part treatment is so opposite blunter, nevertheless, this unexpectedlies flavour chamfer problem is not serious. Although break bits chamfer,not be the one part that bit section brim pours wine cup, but the crucial point of the radius of circular arc of honing, point of a knife, blade that repair light and the combination that take part is mixed to function is crucial as a result. Come for years, bit technology already was in Xiu Guangren to bring revolutionary change for turning finish machining on the whole. At the same time it also improved hard part turning. Nowadays, the razor blade of the blade that repair light that develops technically can be used at finish machining of hard part turning and semifinishing machining operation, ability of its feed rate is remarkable the radius of circular arc of point of a knife of prep above convention. Chamfer of Xcel razor blade it is rate of feed of hard part turning / the surface is bright and clean those who spend is farther optimize. It was balanced carefully take the linear cutting blade with very small part and Xiu Guangren skill. This are small carry on into horn advocate of bit into horn, be worth high at the cutting deepness of this razor blade a bit. It rises rare change the intention that cuts bits, allow to use higher feed rate thereby. This will have profit quite to manufacturing efficiency, conduce to the razor blade that reduces cutting deepness border to be in wearing away. Xcel concept can drop cutting temperature, bring quite considerable promotion to manufacture efficiency. Sum up today, hard part treatment can undertake more extensive optimize. As a craft, it already developed ahead nowadays, can answer all sorts of convention and new requirement. Implementation is more high-powered, offer more alternative, and of cutting tool of new generation cutting come out to already made these become a possibility. Because had a series of new-style the cubic nitrogen that reachs a course to improve changes chamfer of boracic brand, razor blade model with strategy of cutting tool method, make hard part treatment can be achieved update and higher competitive level. What is meant by turning of hard part of hard part turning (HPT) it is right tall hardness workpiece undertakes sheet nods turning. Normally, the hardness limits of this craft is 58 to 68 HRc. Workpiece material includes steel of sclerotic alloy steel, cutting tool, case hardening steel and part of metallurgy of heat treatment pink. It basically is finish machining craft, but also can be semifinishing machining working procedure, the requirement is mixed in dimension appearance the surface is bright and clean degree on achieve very tall precision. Need to undertake grinding to these surfaces normally before. CNC Milling