High temperature alloy issues the efficient treatment of makings

Time:2023-06-20 14:33:33
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source:NEWRGY CNC Machining

Make in machinery currently in, as a result of the product change quickly, be opposite consequently of the spare parts choose also had higher demand, special in the production that waits for an industry in spaceflight, large power station and ship vessel, material of a few difficult treatment is like stainless steel of high temperature alloy, titanium alloy, heat-resisting, composite material to wait, already by wide to use, use a face among them big and the efficient treatment of material of relatively commonly used high temperature alloy more got more pays close attention to. High temperature alloy, normally cent is 3 kinds, namely alloy of alloy of iron radical high temperature, nickel radical high temperature and alloy of cobalt radical high temperature, spend from difficult treatment Cheng for, the treatment of alloy of nickel radical high temperature should say have a typical case more gender and representative. The main reason of difficult treatment of high temperature alloy says simply but reduce 4 respects: It is intensity of material high temperature tall, treatment sclerosis liability is big, commonly the unit cutting of alloy of nickel radical high temperature alloy steel of the carbon in force comparing is tall 50% ; The treatment sclerosis of layer of surface of the workpiece after treatment and rudimental stress are great, sclerotic degree can amount to 200% ～ 500% ; 2 it is thermal conductivity difference, its coefficient of thermal conductivity is the 1/5 ～ 1/2 of 45 steel about, reason cutting temperature is high; The 3 felt liability that are pair of cutting tool are big, extremely easy when be machined to high temperature alloy generation accumulates bits tumour, make cutting not stable, affected treatment surface quality thereby; 4 it is aggrandizement element content tall. The metallic carbide with a large number of very strong abrasiveness is formed in alloy, the horniness such as the compound between the metal is nodded, have intense abrade effect to the knife. Next makings of high temperature alloy, it is mechanical first working procedure in making, issue makings craft working procedure traditionally, it is commonly annulus type bimetallic is used to take makings of club of saw blade general or different and sectional part semifinished product to cut off on horizontal band sawing machine (steel of common alloy tool and saw blade of high speed metal strip cannot undertake the makings below high temperature alloy machines) . Use bimetallic of high-powered high-speed steel to take saw blade (point data comes for M42) the high temperature alloy of cut difficult treatment, its cutting efficiency is low, life is extremely brief also, good stuff is the alloy of nickel radical high temperature that with cut a diameter is 130mm exemple (material is GH4169) , use M42 bimetallic saw blade issues the time of makings to be 8 ～ 10 hours about commonly, and the life of a saw blade also can issue only, we chose a kind after high grade super- hard model bimetallic takes saw blade (the brand is M51) , be opposite with this saw blade with the norms, high temperature alloy that pledges with material good stuff issues makings treatment, its are in cutting tool cutting efficiency and life respect rise somewhat as a result, but the scope that increase is in only 15% ～ 20% between (the hardness that blade of cutting of this saw blade is in is 67 ～ 69HRC) , we think to pledge with this kind of material with the belt of the type saw blade machines high temperature alloy to cannot satisfy manufacturing requirement, for this we pass a variety of plan to compare, the hard alloy that has tall hardness was chosen to take saw blade after, through experiment and practice application, really, hard alloy takes saw blade to be in apparent to expecting to be obtained in treatment below high temperature alloy effect, satisfied the requirement that produces plan. The design that hard alloy takes saw blade and choice hard alloy take saw blade to different capable person is mixed character structure, in practice application we discover is not belts of any a kind of hard alloy saw blade is opposite in treatment of the makings below high temperature alloy, can get favorable result, choosing the reasonable, result that uses the ability below suitable case to obtain ideal only. For this we are opposite those who take form of the structure of saw blade, flute profile, material and cutting dosage is reasonable choose waited for all directions face to undertake choose and contrasting, its situation is as follows: Graph 1 2/3 changes pitch takes hard alloy of structure of cutting tool of diagram of saw blade structure to take saw blade, use commonly set tine to solder type construction, hard alloy takes saw blade crown to have tall hardness, tall wearability, with the advantage of tall fatigue resistance, but its are main defect is a gender fragile, intensity is not low, impulse withstand. Falling to high temperature alloy when makings, cutting tool structure is chosen outside dividing the character that should consider data, its choose a principle basically to still answer the difficult processability according to high temperature alloy, considering be mixed to be opposite by the appearance of treatment part semifinished product the main demand of treatment (if cutting curiums with rising,cut efficiency to give priority to, still give priority to in order to lift longevity order) will decide the structure that takes saw blade is chosen is to use thick tine or serration, it is to wait for pitch to still change pitch. Contrast through experiment application (curium finally according to its especially cut next material data comparative result) , we think to issue the band saw of makings to high temperature alloy, its structure with choosing thick tine is mixed change the hard alloy of pitch takes saw blade to be beautiful, its reason we think, curiuming to high temperature alloy when cutting next material (especially alloy of nickel radical high temperature) the adhesiveness that cuts bits is very strong, cut bits not easy and successful eduction, of the tumour that accumulate bits when when be born, destroy make face of the knife after edge collapse blade, cutting tool wears away easily aggravate, choose thick tine not only edge intensity increases, also can make the space that hold bit increases at the same time, facilitate choose bigger feed speed to improve cutting efficiency; Change to the adoption of pitch can reduce cut noise and make vibration is reduced, when cutting more smooth also, be helpful for cutting tool durability so rise. Change the structural diagram that pitch takes saw blade pursues it is thus clear that 1. Standard tine is ticked off model tine echelon tine pursues of forms of 2 commonly used flute profile of cutting tool of flute profile form choose the flute profile form that takes saw blade to have a level commonly usedly tine, tick off model tine and ladder tine, type sees a picture 2. ° of G=0 of the horn before standard tine cutting, tooth flank is perpendicular at matrix, alveolar deep and narrow. Tick off model 10 ° of ～ of ° of G=5 of the horn before tine cutting, alveolar deep and wide. 15 ° of ～ of ° of G=10 of the horn before ladder tine cutting, hind 8 ° of ～ of horny A=6 ° tooth intensity is high, cutting of force of comfortable Yu Jiang. To the treatment of material of high temperature alloy, outside taking saw blade to remove the hard alloy material that chooses high strenth, of flute profile it is very important also to choose, ladder tine has enough strength, when cutting blade of not easy collapse, as a result of before part is larger, fight force also relatively mark collimation tine is small, choose ladder tine through carrying out test and verify to also prove opposite at other the cutting effect of two kinds of flute profile had better. Brand of cutting tool material applies to the hard alloy brand that processes to cutting of material of high temperature alloy to basically have two kinds surely really, namely the M in ISO standard kind with K kind (recommend now for S kind) , from curium the result that cuts comparative experiment will look, brand of two kinds of cutting tool on cutting efficiency rise, differ not quite, but curiuming cut on service life, the belt that is equivalent to M15-M30 brand material pledging saw blade should compare the belt that is equivalent to K05-K20 brand the) of high temperature alloy that saw blade raises 15% ～ 20%(to process identical norms brand. Of cutting dosage reasonable next makings that choose high temperature alloy, of cutting dosage reasonable choose, having crucial effect, reasonable cutting dosage can assure next makings with normal workpiece, those who assure cutting efficiency and life is remarkable rise, the grating noise that the as a result of cutting tool and workpiece felt cutting bits when still reducing next makings at the same time, attrition produces, to us Jigaowen closes the of all kinds nickel of next makings in light of result of application of gold name trial (undertake efficiency and life consider integratedly) of reasonable cutting dosage choose for: Cutting linear velocity is speed of feed of 15 ～ 20m/min (material purify is led) for 6 ～ afore-mentioned 8cm2/min cutting dosage, it is us through experimenting for long application reachs, have certain economy. Work through afore-mentioned four respects, use hard alloy to take saw blade to machine high temperature alloy, in Harbin turbine the factory obtained apparent economic effect: Via experiment, application multinomial data result contrasts, the hard metal that uses now is taken saw blade and take saw blade to machine photograph of high temperature alloy to compare with bimetallic formerly, cutting efficiency can raise 5 ～ 8 times, if machine semifinished product dimension to be 140 × the alloy of high temperature of GH4169 nickel radical of 245, use the material below M42 bimetallic saw blade formerly, a makings needs 6 ～ 8 hours about, and the hard metal that uses make choice of now takes saw blade to machine high temperature alloy, next makings time of a workpiece are controlled for 1 hour only, at the same time more outstanding is cutting tool life rise, when the semifinished product of high temperature alloy to afore-mentioned brands and norms is machined, use M42 bimetallic saw blade formerly, a saw blade can issue only, and the hard metal that uses now takes saw blade, general one takes saw blade to be able to fall makings 20 ～ 24, (The circumstance with reasonable, apt operation chooses to fall in cutting dosage, it is OK still that one takes saw blade next makings 40 ～ 50) although show to take the price of saw blade to want to compare bimetallic saw blade with hard alloy,control 5 times higher, but be compared from sexual price and for economic integration benefit (the comparative) that passes afore-mentioned typical exemples especially, using hard alloy to take saw blade to machine high temperature alloy is very economical, it is achieved and achieved the goal of life of low cost, longevity, efficient treatment. Hard alloy takes saw blade use use hard alloy to take saw blade to undertake curiuming cutting next material to material of high temperature alloy, although be a kind efficient the technology measure with ideal, but if use undeserved, a tooth-like part of anything that takes saw blade will wear away quickly to be caused even curium belt rupture, such not only short of expects the result, still can cause bigger loss even, because this uses hard alloy tape correctly,saw blade is a very important thing. Bring the due and firm demand when saw blade is used, its are specific the requirement basically is in undermentioned tripartite face: To the requirement of the machine tool: The tigidity of sawing machine is close friends, have certain precision, can contented hard alloy brings the demand that saw blade machines smoothly; According to workpiece diameter (cutting area) size is reasonable the sawing machine that chooses different power, norms; The machine tool has good clear bit, refrigeration and saw blade the configuration of oriented device. To handling use demand: Workpiece clamp wants firm, clamp should be checked to nod after clamp (face) whether be of workpiece in upside, in order to assure the stability when treatment; Take saw blade adjust: Take saw blade newly to must pass the ability after adjusting to undertake normal cutting, lest cause toothed damage prematurely. After crown combines a course through running, it is normal to just can have wear away, did not close through running will bring about crown to be destroyed prematurely. The feed during adjusting is belt speed the 20% ～ of normal feed 30% . The choice of tensile force: Too large tensile force can be caused curium belt rupture; Tensile force is insufficient, meeting attaint curiums take or bring about cut inclined, when using hard alloy band saw, tensile force is sure to move 2200 ～ 2500kg/cm2. The refrigeration when cutting and cut bits to rinse: Use hard alloy band saw to fall to material of high temperature alloy when makings, to drop cutting temperature, reduce cutting obstruction and prolong band saw service life, curium affusion must be irrigated continuously when cutting agent pole presses cutting fluid, in the meantime, curium cut generation cut bits, should use iron to brush synchronism to be cleaned clean. Next makings that the logical choice of cutting dosage expects to semifinished product of high temperature alloy, whether does cutting dosage choose reasonable, will assure to curium directly cut on the rails, at the same time reasonable cutting dosage still will acquire taller cutting efficiency and cutting tool life, because performance of cutting of material of high temperature alloy is very poor, so cutting dosage photograph expects to other alloy rolled steel for, want low much, carry out a proof, using the cutting dosage that afore-mentioned citing recommend is relatively reasonable, like feed speed (material purify is led) had chosen low, criterion face of the knife after cutting tool wears away will increase, and if increase cutting speed and feed rate again, also can make cutting force increases, make the chamfer that discharge bits blocks bits up, cause collapse blade and cutting tool life thereby reduce. CNC Milling CNC Machining