Efficient cutting tool is OK spare parts of complex to appearance gas turbine engine has efficient treatment. Annulus, dish, spare parts of engine of this kind of gas turbine has axis and casing commonly relatively complex form, normally need suffers the profile modeling turning that groove undertakes inside bounds space in stricture. The data of these spare partses is average machinability is poorer. Temperature of tall cutting force, tall cutting and stronger groove wear away the trend is machined to efficient cutting and cutting blade raised very tall requirement, this develops corresponding cutting tool and treatment method technically with respect to need. Among them, wide chamfer copying holds larger proportion in whole cutting time, because this people is met,pay close attention to all the more special hereat the technology of newest cutting tool of the domain. The cutting of special appearance stems from intensity reason of course, the form of chamfer of most inside and outside of gas turbine spare parts always contains circular arc face and a few complex curved surface. To machine wide chamfer or hollowness, size is proper but the solution that dislocation round razor blade makes first selection naturally. Circular cutting cutting tool has a lot of advantages, if have most solid cutting blade, allow to use taller feed and can build appropriate exterior mass. Accordingly, the applied growth that round razor blade machines a domain here is splitting, this is specific also reflected the huge success that pledges in bit chamfer form and material development field place is obtained recently. Almost all razor blade has radius of circular arc of point of a knife, go up in this bit, round bit can say its are whole cutting blade all exists with the form of radius of circular arc of point of a knife. They can be the real round bit that uses bolt clamp with what go up in common lathe tool, but those who go up is use in grooving knife plate,also have the grooving bit of circular arc point, or the razor blade of head of bend circular arc of dispute mark in order to gain the biggest cutting tool accessibility. To above these cutting tool types, the outline radius of the dimension of method of cutting of first-rate cutting tool, round razor blade and workpiece is closely related (graph 1) . Graph the cutting with the cutting tool slashing requirement with the special option of need of spare parts treatment of 1 complex form is being machined by difficult treatment material (if heat-resisting is super alloy or titanium alloy) when the gas turbine part that make, must choose cutting tool, cutting carefully parameter and method taking a knife. If pledge to same knife sheet,mix groovy form, the cutting blade with right choice (bit) appearance can make cutting tool life lengthens 8 times. The workpiece material machinability that says here is poorer, have to these very this is an eclectic choice for the material of high strenth and heat-resisting attribute. Cutting force and cutting area temperature want prep above other data; The pressure on cutting blade is centered in lesser cutting area and change is acuteness, cause cutting tool to be in of local district wear away acuteness; And cut the platoon bits when bits appearance also goes against grooving. In addition, the cutting tool that chooses for heat-resisting alloy place should have place to differ with the knife of cutting titanium alloy. The place that copying deserves to undertake optimizing when the groove on these spare partses is very much, can shorten not only handling time, still can ensure the consistency of the security that machines a process and spare parts quality, reduce percent defective from this. Choosing for subsequently rough machining or finish machining working procedure the most advanced with the most appropriate round cutting tool (bit) hind, undertake optimizing to cutting parameter namely next. This action is to control heat in metal cutting, improvement cutting tool life is mixed cut bits to form. When mentioning use circle razor blade, ensure deepness of the correct ply that cut bits, cutting and feed appear particularly important. The tool cutting edge angle of cutting blade is the key that cuts bits ply certainly, crucial effect had when machining heat-resisting alloy. The groove when this super to heat-resisting of keep within limits treatment wears away, and the control that bits cuts to growing when titanium alloy is machined is having main effect. So that form,this chooses reasonable feed with respect to need enough cut bits thickly, and won't negative to cutting blade generation effect. To hard alloy and razor blade of pottery and porcelain, when processing these data, have disparate value of cutting speed limit. To razor blade of pottery and porcelain, need the heat in metal cutting that careful balance produces: Enough makes workpiece material happens to plasticity is out of shape and be formed cut bits, but cannot excessive, lest be opposite,cutting tool material produces ill effect. To hard alloy razor blade, cutting speed is restricted (normally inferior) . From the point of the point of view that produces efficiency, using taller feed is advantageous normally, and right now cutting tool life can have a bit reduce. Of round razor blade choose whether have the tool cutting edge angle with 90 successive and alterable ° of 0 ° ～ , specific depend on the cutting blade length that participates in cutting. Round razor blade has most solid cutting blade, and less to walking along knife direction to restrict. The razor blade of pottery and porcelain of cutting of super to suiting heat-resisting alloy and the hard alloy razor blade that suit this kind of alloy and titanium alloy cutting, deepness of satisfactory the biggest cutting can be obtained to should be bit diameter when using round bit (IC) 25% (corresponding the tool cutting edge angle at 60 ° ) . Those who cross big cutting deepness to be able to cause oscillatory trend aggravate and function is not stable. Be bit diameter when cutting deepness 15% (corresponding the tool cutting edge angle at 45 ° ) or lower when, can obtain optimum behavior. Use what what lesser tool cutting edge angle forms to cut bits thinner, this is meant can reduce groove tatty current and have the latent capacity that increases feed. Be worth according to corresponding commendation, considering appropriate the biggest with the smallest ply that cut bits, cutting deepness and ratio of bit diameter IC upright at 0. 05 (corresponding at 26 ° tool cutting edge angle) with 0.
15 (corresponding at 45 ° tool cutting edge angle) the feed between, correction coefficient is 2.
3 ～ 1.
4. Nextpage is visible, when using round bit, the compares process of quality of possibility of time of pair of metallic purify rate, cutting, process designing, surface and grooving and copying security of cutting deepness and bit diameter has quite big effect. The platoon bits with the cutting tool right choice when turning groove is one of successful crucial factors. To titanium alloy, what normally the hope gets is to cut bits width to want to be less than bit (groove) the longer helix of width or snail coil bits. Titanium alloy is formed wind shear contrast is cut when cutting bits extremely tall, form harder consequently narrower cut bits, this need chooses the properest bit chamfer form and feed. Inside the working limits that chooses groovy form, cutting tool life also is one of influencing factor that decide optimal feed. The spare parts that indicates here needs to undertake a lot of wide chamfer are machined, such organic meetings pass application the most appropriate cutting tool and method taking a knife undertakes optimizing to cutting. Without doubt, all groove have sidewall. If do not take corresponding step, cutting tool can cause the adverse condition with cutting blade abrupt and overmuch penetration of a cutting tool when cutting sidewall. Transfer to bottom and sidewall when cutting when round horn, cutting blade can experience the impact that cutting deepness increases suddenly: Its tool cutting edge angle from add quickly under 45 ° to 100 ° -- corresponding cutting deepness is OK from diameter of round razor blade 15% increase 60% . This kind of concussion and additional laden effect are met aggravate cutting tool is excessive tatty risk, the dislocation number that can cause bit rupture even and reduces round razor blade (graph 2) . Graph 2 groove machine sketch map " boil " / " boil " the cutting of type is round to using the turning of bit, can adopt all sorts of methods to transfer to cutting workpiece and bottom and sidewall the treatment of round part part undertakes optimizing. Its are main the method is feed is reduced when approaching round part, this action can reduce the pressure on cutting blade. Another kind of method is union is used agree with transfer the bit diameter of round horn radius, sidewall of the treatment when such making that bit is different and transfer round part part, reduce the osculatory length of cutting blade and workpiece thereby. Our purpose is to use dimension and sidewall to transfer the round razor blade that round horn photograph gets used to, walk along cutter track diameter and feed with first-rate, with " boil " and " boil " the means treatment of feed transfers round horn. Transfer the difference between round horn radius and bit diameter is bigger, of feed reduce less, manufacturing efficiency also can be jumped over tall. As to the cutting method of cutting tool, radius of its process designing should not be more than bit diameter. Generally speaking, should differentiate wide chamfer treatment the gather that is a certain number of profiling. This action is to appropriate cutting maintains below first-rate feed blade contacts arc length, in order to obtain bigger cutting deepness. Cycloidal turning has constant circulation taking a knife, blade of cutting tool cutting and workpiece contact arc length are relatively lesser, method of this kind of treatment can improve cutting result, the advantage is clear, can replace well inclined to turning, cut type turning and multiform grooving circulation. The progress of domain of treatment of round razor blade pledges in bit chamfer form, material and on process designing method, material of appropriative razor blade pledges and groovy form is super to turning heat-resisting for alloy crucial. Regard pottery and porcelain as the complement of bit, full company of coke of gram of hill spy dimension is newest the hard alloy razor blade that roll out obtained very great progress. SO5F is a kind of very advanced hard alloy material pledges. Its are tall the fine grain matrix of hardness adds CVD scumble layer, make its can bear higher cutting temperature, have very good wearability. Of course, this material can be character in rough machining and finish machining working procedure undertake turning with taller cutting parameter. The hard alloy material of PVD coating pledges GC1105 has very tall red rigid, can avoid occurrence plasticity to be out of shape inside very wide cutting parameter range. In qualitative respect of material of pottery and porcelain, mount surpasses A Long (Sialon) the lathe tool of CC6060 of pottery and porcelain makes copying and sunken antrum treatment got perfecting. In more stable treatment circumstance, or workpiece surface already below the condition of prior operation, this material is had character very strong fight groove to wear away ability. In groovy form respect, already developed round razor blade and razor blade of grooving of circular arc point (like SM and RO) will optimize heat-resisting working procedure of the turning of super alloy, copying and sunken antrum treatment. SM is look of a kind of chamfer of round razor blade that has bigger scope of application. Its light groove body and S05F material are united in wedlock character, can use very tall cutting parameter. Groovy form RO is used on grooving of blade of circular arc of CoroCut double head and profile modeling razor blade. This chamfer form has sharp cutting blade, when treatment heat-resisting super alloy is mixed when other and agglutinant material, the good control that cut bits can be offerred below inferior cutting deepness and feed. CNC Milling
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