Civil / limited company of science and technology of control of power of aviation of Xi'an of of Du Gaimei of limited company of science and technology of control of Xi'an aviation power, Liu Lingyun, Zhang Jing (the boat in the following abbreviation accuses on the west) found 1955, be subordinate to belongs to company of group of Chinese aviation industry, it is fuel of Chinese aviation motor the base of device of hydraulic pressure of control system, plane and development of hi-tech mechanical and electrical products, experiment and production. Have advanced digitlization nicety machinery to make, special type craft, metric detect ability and informatization government measure, set the management department such as collaboration of more than 10 two designs institute, professional production unit and relevant business, production, IT, international. The digitlization that is platform with PDM designs production system, what the boat in making accuses to have development to get used to the different product that the market changes quickly on the west is flexible process capability. Hold water nearly 60 years to come oneself, in boat accuses to was development of engine of a variety of 50 aviation of Chinese, spaceflight to produce 150 many model early or late on the west tens of 10 thousand cover fuel accessory. In the meantime, through implementing strategy of core technology radiate, spaceflight of successful already sortie and land are repaired with chariot power control, civil aviaton, the domain such as production of subcontract of international aviation component, boat of Si Yu of as strange as Huoniweier, Gu Deli, combination technology, Eton, GE, Shi Mi, moxa the industry of world famous aviation such as design department built long-term stability. As product of aerospace domain engine change, the use proportion of titanium alloy is larger and larger: Titanium alloy learns function, density by right of superior put together resultant force small, corrosion resistance is strong wait for a characteristic, make the production material of aircraft engine ideal. In system of control of aviation motor fuel, titanium alloy already replaced the data such as refractory steel, stainless steel stage by stage, make of all kinds connection, the first selection material of the component such as fastener. But at the same time, the hardness of titanium alloy tall, wearability is advanced the characteristic also brought huge challenge to treatment, especially cutting cutting tool, wear away to wait for treatment difficult problem quickly to appear often because of the cutting sex of titanium alloy is differred and bringing about cutting tool, affected treatment precision and efficiency badly. Accordingly, in the analysis that boat accuses to basically pass cutting of pair of titanium alloy material to machine function on the west, choose reasonable treatment cutting tool, affirmatory relatively the cutting parameter of actor and treatment craft, will find suit to be opposite on numerical control lathe titanium alloy axis kind the efficient way that the spare parts has rough machining and precision work. Titanium alloy treatment brings what all sorts of attribute of great challenge titanium make to make the spare parts material that has powerful appeal to cutting tool, but among them the machinability that a lot of attribute also are affecting it at the same time. Alloy of commonly used titanium is two-phase titanium alloy in industry, namely (α + β ) titanium alloy, TC4, TC6 is used in middling of accessory of aviation motor fuel, among them the typical delegate that TC4 is this kind of alloy. Function of tall, cutting differs hardness of titanium alloy material, and easy generation machines sclerotic phenomenon, to cutting treatment brought difficulty. The TC4 in be aimed at titanium alloy the spare parts of this kind of material, especially turning machines craft, in boat accused to do relatively thorough research on the west, gained a few experience. Above all, the modulus of elasticity of titanium alloy is small, among them the stretch model of TC4 measures E=110GPa, it is the half of steel about, and thermal conductivity is low, the flexibility of the workpiece that be added that causes by cutting force place consequently is out of shape big, generation of the meeting in machining a process at the same time is mixed higher relatively cutting force of concentration. Quiver appears when produce vibration easily so and bringing about cutting, reduce workpiece precision, because this should improve the tigidity of treatment system. Next, the local high temperature that titanium alloy produces in cutting treatment, make titanium absorbs the oxygen in atmosphere and nitrogen very easily, form thereby hard fragile cortical. This machines sclerotic phenomenon with respect to what can cause workpiece to machine the surface, and treatment sclerosis rate is rapid, the nick that makes generation of cutting tool surface serious, collapse blade phenomenon produces easily in cutting process. Besides, when the physics of itself of titanium alloy material and chemical function make its cutting is machined as big as workpiece affinity, easy generation is sticky when the cutting tool when cutting is machined and workpiece are contacted knife phenomenon, increased the attrition between cutting tool and workpiece, produce many heat in metal cutting. A large number of heat in metal cutting that arise from this cannot be given out in time through cutting bits to come loose, lowered the service life of cutting tool greatly. Because this machines titanium,the cutting tool of alloy must have high fever hardness. Titanium alloy treatment is the aviation motor fuel that the boat in project of a system accuses to make on the west in controlling a system, titanium alloy spare parts with small-sized axis kind the spare parts is given priority to, turning treatment is his main process instrumentation. The titanium alloy treatment here can be regarded to be project of a system, need has a consideration from the many angle such as parameter of cutting tool of treatment facilities, cutting, cutting, cooling fluid. With respect to treatment facilities character, processability of machine tool of need of titanium alloy treatment can be good, cooling and sufficient, so treatment facilities chooses to machine the numerical control lathe with taller precision, it is good that the main shaft when treatment shakes minimum to machine stability. Be close friends with the hardness of the cutting tool data that processes at titanium alloy and wearability, have the wonderful hear resistance, strength that can keep taller below high temperature and tenacity, and certain impact resistance and fight ruinous. The cutting tool that contented above asks has: Cutting tool of cutting tool of pottery and porcelain, coating hard alloy, cubic nitrogen turns boracic cutting tool (CBN) reach kind of diamond cutting tool (PCD) etc. Among them price of cutting tool of coating hard alloy is low, and have good thermal conductivity and taller hardness, also show scene in the respect such as red rigid and tenacity, although compare pottery and porcelain, cubic nitrogen to turn boracic cutting tool (CBN) , kind the hear resistance of diamond cutting tool and chemical stability should be differred a few, but mix than pottery and porcelain cutting tool has kind of diamond taller impact resistance and fight ruinous. Because this already made the first selection cutting tool of treatment titanium alloy. In turning parameter respect, also need more thinks titanium alloy treatment. Be like the set of cutting speed, exorbitant cutting speed can bring about heat in metal cutting to lift, phenomenon of overheat of blade of cutting tool cutting, felt is serious, cutting tool wears away aggravating, can shorten cutting tool service life; Can bring about craze of surface layer of titanium alloy workpiece or oxidation at the same time, affect the mechanical performance of workpiece, should be in so make sure bigger cutting tool durability falls, choose proper and inferior cutting career, reduce finished cost and assure to machine quality. It is the set of cutting deepness next, because titanium adds up to the beard before golden workpiece is machined to have conditioning treatment, make workpiece surface has an oxidation layer, should use to raise the durability of cutting tool relative to bigger cutting deepness, can cut the metallic layer that did not oxidize into titanium alloy airframe directly, improve cutting tool service life. What the consideration needs when another parameter set is feed, the size of feed is affected to generating the volume of cutting temperature is not very big, below the premise that assures to machine efficiency, reducing cutting speed to increase feed is logical cutting way. To assure to machine quality and the durability that raise cutting tool, return what should consider cooling fluid to use, want to undertake adequately cooling to machining area for instance, cooling fluid can drop cutting temperature effectively not only, still can reduce the to cutting tool cohere phenomenon when cutting, improve efficiency, prolong cutting tool service life. Improvement of cutting tool of hard alloy coating machines a graph 1 product part drawing rotates kind of spare parts if spare parts of some snail a place of strategic importance, the biggest outside round diameter is φ 33. 8, material is TC4, raw material chooses φ 30 great ability. The spare parts uses turning treatment to finish (if pursue 1) . Machine precision to assure a spare parts, treatment facilities chose number of feed inlet to accuse lathe, rotate speed of its main shaft is top 6000 turn / cent, main shaft is jumpy be less than 2 μ M, it is good that the main shaft when treatment shakes minimum to machine stability, cooling fluid but by 3 direction ejective, cooling and sufficient. When turning of the circle outside undertaking, initial stage chose cutting tool of coating of some well-known trademark hard alloy, the cutting parameter that recommends according to manufacturer undertakes machining. Because condition of spare parts supplied materials is round good stuff, the surface has layer of heat treatment oxidation, the border of the cutting tool when treatment wears away serious, cause treatment 10 -- cutting tool of 15 spare partses wears away with respect to what produce different rate phenomenon of the blade that reach collapse (if pursue 2) , cannot satisfy the treatment requirement that batch produces. Graph of 2 cutting tool wear away formal later period tries check test and verify through relapsing, in boat accused to choose Waerte finally on the west the cutting tool of hard alloy coating below company coequal price: Round rough machining chooses WNMG080404-NM4 material qualitative WSM30 outside; Round finish machining chooses CCMT09T304-PF4 material qualitative WSM30 outside (if pursue 3) , this razor blade is used at boring hole to machine at the same time. Graph coating of 3 hard alloy razor blade of qualitative WSM30 of material of WNMG080404-NM4 of of cutting tool of thick, finish machining is form of a W lose model bit, double-faced blade of 6 effective cutting, NM4 is to be stainless steel and chamfer of design of difficult treatment data only model, suit medium cutting, in unilateral surplus 0.
5 -- 4mm, feed 0.
16 -- 0.
25 less than, can form cut bits faultlessly. The anti-impact properties with WSM30 qualitative material is very strong, bit coating was to use Al2O3 physics coating, ensured already the sharp sex of point, have outstanding red rigid again, prolonged cutting tool life effectively. Razor blade of CCMT09T304-PF4 material qualitative WSM30 is C form model bit, PF4 is the finish machining chamfer that designs for stainless steel and difficult treatment material only model, suit unilateral surplus to be in 1.
The fine vehicle of 5mm less than is machined. Because the fabricating characteristics of TC4 reachs the character of qualitative WSM30 of cutting tool material, make much quantity of heat produces when cutting, treatment area temperature can achieve 800 ℃ above, and the high temperature of area of cutting tool cutting can produce anneal and bate effect to the cut of workpiece, can eliminate the treatment sclerosis appearance of the spare parts greatly; Cutting tool of hard alloy coating is high temperature resistant at the same time and red rigid is good, make workpiece thick when the car is machined easier cutting; Rough machining is protruding triangle razor blade with WNMG080404-NM4 razor blade, lose model bit, can positive and negative is used, in all 6 blade can be used 6 times, reduced the cutting tool cost when rough machining greatly. Rough machining chooses big feed of low rotate speed, cutting parameter chooses: Cutting deepness Ap=0.
8 -- 1.
2 Mm; Feed F=0.
18 -- 0.
4 Mm/n; S=600 of main shaft rotate speed -- 1000rpm. An edge can machine thick car razor blade 25 -- 30 spare partses. Finish machining and bore hole choice of treatment cutting parameter: Cutting deepness Ap=0.
2mm; Feed F=0.
1mm/n; S=2000rpm of main shaft rotate speed is controlled, an edge can machine fine vehicle razor blade 45 -- 50 spare partses, bore hole an edge when treatment can be machined 35 -- 45, the exterior surface roughness of the spare parts after treatment can amount to Ra0.
8, dimension precision is controallable 0.
005mm less than, satisfied the design requirement of the spare parts, and the phenomenon eliminates the treatment sclerosis when turning spare parts basically, rose to machine efficiency and cutting tool service life greatly. Graph alloy of titanium of plan of 4 spots treatment is in with its good performance the utilization rate of domain of industry of domestic and international aerospace promotes in year after year, but bear finished cost efficiency of tall, treatment durability of low, cutting tool is low the influence of the problem, applied level is compared large block all the time, through above cutting tool of analysis, logical to function of titanium alloy cutting choice reachs treatment parameter, effective settlement durability of the cutting tool when turning of titanium alloy spare parts is low problem. Can yet be regarded as of cutting tool of coating of lathe of practice proof numerical control, hard alloy machines the edge tool of titanium alloy, cover with tiles on choice of turning cutting tool the product of Er spy company is a kind of choice that compares economy. CNC Milling
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