Squirm Chinese ink is cast-iron (CGI) more the 2 ～ that the tensile strength that an account that processes hard is it is casting pig 3 times. In milling treatment, higher tensile strength translate into higher cutting power, the treatment power that cast-iron place needs treatment squirm Chinese ink makes an appointment with 15% ～ higher than machining casting pig to want 25% . Squirm Chinese ink is cast-iron (the CGI) application on diesel engine and spare parts of cycle racing engine increasingly grow in quantity. For effectively cutting treatment provides the data that challenges a gender this kind extremely, the choice of cutting tool is crucial. The ceaseless development of new material of function coriaceous workpiece, driving tool manufacturer to develop brand of form of new cutting tool geometry, hard alloy and coating technology. For example, the job shops that serves for aviation industry must find the significant step that processes 5553 titanium alloy and composite material. Same, medical spare parts job shops needs to machine PEEK etc of polymeric, stainless steel is special material. And in automobile manufacturing industry, a kind of typical difficult treatment material is iron of squirm Mo Zhu (CGI) . This kind of material basically is used at making lid of engine cylinder body, air cylinder and the bearing that are used at lorry of large diesel engine normally build cast. As a result of squirm Chinese ink cast-iron weight compares traditional casting pig small in part, because this has taller fuel to the car can effect. In addition, its intensity and stiffness are one times taller than casting pig, can design a wall thereby thick lighter engine cylinder body. Accordingly, the weight of cast-iron engine wants a squirm Chinese ink that has assembled to be reduced than casting pig engine 9% the left and right sides. The application with squirm cast-iron Chinese ink already had in Europe longer, also had been accepted by more and more person place in the United States. Iron of squirm Mo Zhu can bear the highest combustion pressure of derv engine, and the aluminium that uses cast-iron gas cylinder bushing makes engine cylinder body do not do this. Certain engine of high-powered V racing bicycle also uses iron of squirm Mo Zhu to make, because can reduce weight,measure not only, and still can raise tigidity (the rigid) of place caves between air cylinder especially. Squirm Chinese ink is cast-iron more the 2 ～ that the tensile strength that an account that processes hard is it is casting pig 3 times. In milling treatment, higher tensile strength translate into higher cutting power, the treatment power that cast-iron place needs treatment squirm Chinese ink makes an appointment with 15% ～ higher than machining casting pig to want 25% . Accordingly, the workshop that machined casting pig some before needs to change the line of production when treatment squirm Chinese ink is cast-iron, may appear the problem with machine tool insufficient power. In addition, iron still can be faced with casting of treatment squirm Chinese ink to challenge below: The hot conductivity with squirm cast-iron Chinese ink is relatively inferior, the accumulation of heat in metal cutting of the generation when be being machined accordingly is in workpiece, meet those who affect cutting tool wear away conversely. As contrary as this, casting pig has better hot conductibility, the heat in metal cutting when treatment is easy the bits that be cut is taken away. Of spare parts of iron of squirm Mo Zhu cast crustaceous have ferrite structure, produce felt effect easily with blade of cutting tool cutting. And of casting pig cast crustaceous for pearlite structure, because this won't produce felt. Differ with casting pig, casting of squirm Chinese ink does not include sulfide in iron. The sulfide deposit in casting pig arrives on blade of cutting tool cutting, can have lubricant effect, be helpful for prolonging cutting tool life. In the foundry technology with squirm cast-iron Chinese ink, joined titanium to serve as alloying element, generated strength thereby taller cast cortical, also formed the free carbide that has abrasion in whole cast at the same time. The alloying element content in iron of squirm Mo Zhu has very big effect to its machinability and cutting tool life. As a result of afore-mentioned reasons, use at the cutting tool life with cutting squirm cast-iron Chinese ink to have the in part of life of cutting tool of cutting casting pig only normally. Milling and boring and casting pig photograph are compared, the milling treatment surface with squirm cast-iron Chinese ink is bright and clean degree (Rz) can rise about 50% , this means the treatment process that can reduce a likelihood to need, the surface that does not need possibly perhaps to use finish machining cutting tool to win a demand is bright and clean degree. In treatment, when cutting tool exits cutting, the brim of workpiece of iron of squirm Mo Zhu won't produce damaged; And casting pig work produces collapse damage possibly, when damaged is serious, bring about cylinder body possibly to discard as useless. Iron of squirm Mo Zhu is compared in the character of this respect and steel similar, can produce burr namely but won't produce collapse damage. Because use groovy craft to machine squirm when Chinese ink is cast-iron, must use inferior cutting rate, because this may need expenditure,compare cutting casting pig to grow the handling time of 3 times almost. Machine a method to decide more efficient squirm Chinese ink is cast-iron, hill spy dimension overcame a company to have a lot of tests. To milling treatment, material of certain optimal cutting tool is coating hard alloy, coating uses titanium of carbonization of thick layer nitrogen (TiCn) and alumina (Al2O3) . The ply of thick coating is 7 ～ 10µm, the ply of scumble layer is 2 ～ 3µm commonly. Feed of 414r/min of rotate speed of 130m/min of speed of cutting of 80mm of length of penetration of a cutting tool of 3mm of deepness of cutting of Heller PFV2 of machine tool of treatment of result of test of milling of iron of squirm Mo Zhu leads 298mm/min every tine feed 0. 2(of 36mm bit amount is used at the experiment) milling gross area 3.
Complete penetration of a cutting tool of 130min(of life of 08m2 cutting tool) life of every razor blade 1.
Result of cast-iron milling test is like the squirm Chinese ink that company of gram of dimension of 54m2 hill spy has right watch place is shown. This experiment is used for treatment cast-iron and the CoroMill 365 milling cutter of the design machines a liquid to control a part. What what use is thick model bit is 12 ° horny razor blade, but it installs the blade holder in negative point of view to go up, formed lesser tangent to cut corner thereby. It also allows to use the razor blade with higher density to range way, in order to obtain as far as possible tall productivity. Cast-iron to squirm Chinese ink turning and boring are machined, hill spy dimension overcomes a company to recommend the hard alloy matrix that collects appliance to have character of tall wear-resisting corrode, add lukewarm chemical gas phase is deposit in using (the wear-resisting thick coating of CVD) craft preparation. The experiment makes clear, with Chinese ink of squirm of boring of CBN razor blade cast-iron cutting tool life is the 1/10 when boring casting pig only. Right now, use small horn (10 ° of 5 ° ～ ) form of cutting tool geometry is properer, recommend do not use cooling fluid when treatment squirm Chinese ink is cast-iron. Company of gram of hill spy dimension and Makino company joint development craft of a kind of boring, can complete the precision work of aperture of thick boring crock through taking a knife. Cutting tool of develops for this much razor blade calls long knife cutting tool (Long-Edge Tool) . This cutting tool is down feed to cut crock hole by helix method, the time that allegedly place of aperture of a crock uses boring of essence of life and treatment casting pig crock aperture comparatives roughly. Treatment of follow-up top gem aperture is the final process before engine is assembled. When developing technology of this kind of new boring of essence of life, company of company and Makino decides Shanteweike, rough machining had better use traditional only head milling cutter, bit uses Si3Ni4 coating and it is boring squirm Chinese ink only cast-iron and optimized geometrical appearance. CNC Milling