The turning new coat that in the light of difficult treatment material machines

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  • source:KAPLOWITZ CNC Machining
In recent years, of terminal user demand raised the workpiece material that makes manufacturing industry place is used to produce apparent progress ceaselessly. For example, the demand of efficiency of taller to car and lorry fuel brought about heft the stuff with light, expensive intensity (wait like high strenth steel and nodular cast iron) utilization rate increases. The demand that aircraft engine lights oily efficiency and less noise higher spurred the development of the high temperature alloy with taller sex of He Ren of intensity of purity, high temperature. Although the requirement of terminal user can be satisfied on older rate, but such progress makes workpiece material has the tendency that is hard to machine more. Be based on this reason just about, tool manufacturing industry had a large number of research and development, be in especially domain of turning razor blade. The chamfer that break bits, coating and matrix chemistry composition are acting important role to cutting tool function. For example, the progress of technology of coating of turning cutting tool can have machined nodular cast iron and alloy of newest aviation high temperature effectively. The treatment function nodular cast iron that coating of tall hardness MT-CVD improves nodular cast iron already made engine spare parts and other car, agricultural the material with equipment and machine tool increasingly commonly used spare parts. This kind of alloy can offer the combination of inferior production cost and good and mechanical function. They are cheaper than rolled steel, and than cast-iron have higher intensity and tenacity. But meanwhile, nodular cast iron special wear-resisting, have wear away quickly the tendency of cutting tool material. This kind of wearability suffers the effect of pearlite content greatly. The pearlite content of nodular cast iron is higher, its wearability is better, and machinability is poorer. Can predict, the cutting material of tall hardness and tall wear-resisting needs to consider the tall wearability of nodular cast iron character. And in fact material includes extremely hard TiC character (carbonization titanium) or TiCN (carbolic nitrogen changes titanium) thick coating machines nodular cast iron to be proved when cutting speed 300m/min is effective normally. But the addition as cutting speed, cut bits / the temperature of scale of cutting tool union also is in heighten. Should produce such situation, tiC coating apt and iron happening chemistry react and bate, more pressure action are fighting coating of crescent moon depression tatty to go up. Below these conditions, the hope has the coat with a kind of chemical better stability, like Al2O3 (although be below inferior speed,be inferior to TiC hard or wear-resisting) . Chemical stability compares wearability more the main character that makes dividing line of performance of a show, cutting speed and temperature depend on the function that be mixed by the grain structure of treatment nodular cast iron. But normally the thinner coating of the TiC of thick coating or TiCN and only oxide is aimed at application of nodular cast iron, because much is machined this kind today,the cutting speed of material is in 150 ～ between 335m/min. To the application of 300m/min of speed prep above, people is satisfactory to the function of this kind of material. It is to make inside this limits cutting function is best, research and development of hill high company and rolled out the material qualitative TX150 that machines in the light of nodular cast iron. This kind of material has character hard and fight metabolic matrix, very ideal to machining nodular cast iron. Its coating is changed by the carbolic nitrogen of a thicker wear-resisting titanium and thinner fight composition of coating of oxide of crescent moon depression tatty, end face is one layer TiN. This kind of coating is applied at present the generation wearability of craft level is mixed fight crescent moon to wear away depression all hardness of the CVD coating of need and what flowing sex increases tenacity is medium deposit of lukewarm chemical gas phase (MT-CVD) craft. Matrix / the assorted function of coating gives very tall fight plasticity to be out of shape with ability of point small collapse, the made good material that makes nodular cast iron of the treatment below regular rate is qualitative. The cutting tool of pottery and porcelain of coating also can machine nodular cast iron effectively. In the past, not the pottery and porcelain with the better tenacity of coating (the alumina pottery and porcelain that such as nitrogen changes silicon and carborundum fiber aggrandizement) the restriction that the application of cutting tool accepts endophilicity of workpiece material chemistry. But can resist through using today the coating that cuts bits to be out of shape the process produces high fever to measure, cutting tool life has increased significantly. Inchoate the certain work treatment of this domain uses alumina coating brilliant to need aggrandizement pottery and porcelain, now the concentration of most research activity of the day changes silicon at TiN coating nitrogen. This kind of coating can widen significantly the applied limits of cutting tool of tall tenacity pottery and porcelain. The development of technology of coating of high temperature alloy already applied a domain to improve productivity substantially in black metal stuff, also improved the treatment performance of high temperature alloy and titanium alloy. The development of fine grained hard alloy and PVD coating, and the addition that how uses pottery and porcelain and knowledge of CBN cutting material is right taller metallic excision is led and improve treatment the surface is bright and clean degree make contribution. The alloy data that carries high strenth what these place in making progress to apply to efficient treatment turbine need below high temperature is particularly useful. This kind " super alloy " will handle and be produced with the very complex method with can maintain sex of clean Ju Ren better. Result, the average temperature that super alloy can use with every time family name 16 degrees rate increases, and show without evidence this kind of trend will be changed. But its every time development will cause negative effect to machinability. As the addition of intensity of super alloy high temperature, action also is increasing in the cutting force on bit cutting blade. Result, once machined alloy of a lot of titanium and nickel approvingly base when the hard alloy material of alloy pledges C-2 is applying at the alloy with current cutting, appeared the groove with cutting blade disintegrate and serious place of cutting deepness line wears away. But can machine super alloy effectively with newest fine grained hard alloy, cutting tool life also gets rising, more important is to raise the dependability that applies at high temperature alloy. Fine grained hard alloy has more qualitative than material of traditional hard alloy higher compressive strength and hardness, just raising tenacity respect to need to raise a few cost, is the cutting tool failure mode with effectively common resistance as a result. PVD (deposit of physical gas phase) the treatment that coating also is proved to be able to apply effectively at high temperature alloy. TiN (nitrogen changes titanium) PVD coating is the earliest use and remain the most welcome. Recently, tiAlN (azotic aluminium changes titanium) with TiCN (carbolic nitrogen changes titanium) coating also is proved to have very good performance characteristics. Compare with TiN coating photograph, tiAlN coating is applying the limitative more on limits. But after cutting rate rises they are a very good choice, can raise productivity to amount to 40% . On the other hand, depend on below inferior cutting speed the exterior operating mode of coating, tiAlN can bring about subsequently the tumour that accumulate bits, small collapse and groove to wear away. TiCN compares other two kinds of coating are hard, can acquire better cutting tool life when milling especially. In recent years, the coating that application machines at high temperature alloy gets further progress, these coating are combined by a few and become. Many lab and spot test had proved, photographs of any a kind of onefold coating compare this kind of compound coating and other, very effective in the treatment application of very wide range. Because this is aimed at the PVD of application of high temperature alloy,compound coating may make the central point of research and development that coating of hard alloy cutting tool lasts. With pottery and porcelain of MT-CVD coating, coating gather is together, their hopeful becomes more effective treatment to grinding the main force of the new difficult treatment material of hair. CNC Milling CNC Machining