With minimum cooling fluid law getting cuts aviation aluminium

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Summary: Introduced hamburger industry university to use the smallest refrigeration to cross law getting to cut a variety of answer the research result of plywood. Consider to make clear, getting cut aluminous, titanium multilayer and compound board when, get the attrition that cuts titanium board to cut bits to wear away action, the Kong Chengla that can bring about aluminium board form, fluctuant extent and average aperture value increase bore diameter and the likelihood exceeds allow to differ. The experiment used technology of minimum cooling fluid, 3 kinds of uses cooling fluid cut bore diameter to affect to getting not quite. When use coating cutting tool is machined, auger cut bore diameter to show direct ratio with feed speed. Broach vertex angle is jumped over too, the aperture of aluminium board is bigger, but the aperture that titanium pulls is changeless. To assure to machine bore diameter quality, use bits of the platoon that retreat a knife and reaming means treatment, reduce first flank width, increase the horn before feed and bit of use a flight of stairs. The preface occurrence as airbus plane new model, material of use aluminium alloy makes the scale of plane airframe drop ceaselessly. Be in tall to data strength demand place, had replaced aluminium alloy with titanium alloy and alloy steel. To reduce plane weight, improve flight economy, the use scale that fiber enhances composite material is rising. To answer plywood component, it is to choose titanium alloy and aluminium alloy above all compound board, because can gain highest strength with the smallest component part ply so. If the special structure such as engine room door is in,be in, also use alloy board, typical is to use Cr-Ni alloy board. Must satisfy the amount of compound panel and ply bear the weight of demand. This kind answer the character that plywood has composite material and join stuff, also brought very big question to treatment. Because head to want first,go up to plane airframe these are compound board bore, next reoccupy rivet rises its connection. Answer plywood is in the number of plies of different position (ply) it is different, because this machinability also is different, but treatment is completed with a broach in asking to machining working procedure together as far as possible, this reachs its to broach material lubricant form raised a very tall requirement. Apparent, to airframe of large component part character, common and lubricant means is inapplicable, should use cooling fluid of a kind of minimum (MMS) technology undertakes machining. Concerned aluminium - titanium alloy answer the research report that bedplate is machined and the dry cutting of ferroalloy machines a respect is very few. Machining aluminium - titanium alloy is compound board when, choose parameter of geometry of cutting tool material, cutting tool and cutting to machine parameter to wait through actor, can improve cutting efficiency. When processing this kind of data, sharp the titanium alloy that did not break off again cuts bits to be able to be stuck in cutting tool surface, make aluminium alloy board on bore diameter increases. To the dry cutting of aluminium alloy treatment studies main concentration machines a respect in milling. Use MMS technology is gotten successfully had cut in all brilliant aluminium alloy. Auger cut be out of shape MMS method also can be used when aluminium alloy; When doing type getting completely to cut aluminium alloy deep hole, the conglutinate action with strong aluminium alloy can make cutting tool life is reduced quickly. Use MMS law and hard alloy broach are gotten when cutting TiAlV, bore speed but by at ordinary times Vc=15 ～ 30m/min raises Vc=50m/min or taller, but can appear to discharge bits problem badly, and because temperature crosses tower above to cut bits now,catch fire phenomenon, because this need increases an amortize cutting,circulate. If use high-pressured refrigeration, can achieve the cutting rate of Vc=90m/min. The article introduced to machine the institute requirement according to Airbus in cutting of hamburger industry university, to aluminium - titanium alloy is compound board in getting the series that cuts treatment to undertake to consider, different treatment craft cuts the influence of aperture quality to getting. The aluminous titanium that 1 test test used 4 kinds of structures is compound board, aluminous plank makings is aluminous wrought alloy 3.

1364T351(4.

4%Cu-1.

5%Mg-0.

6%Mn) ; Titanium plank makings is titanium alloy 3.

716411(6%Al-4%V) . Aluminous titanium is compound board label respectively for Al-Ti(4.

5mm is aluminous board + 1.

2mm titanium board) , Al-A1+3 × 2Ti(6 nosebleeds aluminium board + 4mm is aluminous board + titanium of 3 2 Qu board 1, A1.

Al+5 × 2Ti(6mm is aluminous board + 6mm is aluminous board + 5 2mm titanium board) , Al-Al+8 × 2Ti(6mm is aluminous board + 2mm is aluminous board + 8 layer 2mm titanium board) . Use Ø4 commonly.

8 ～ 6.

The pulverous metallurgy hard alloy of 3mm (VHM) broach, ) of fine brilliant of brand K40 and K30F(; As also use bit of fried dough twist of the high-speed steel that contain cobalt quite (HSS-E 1.

3243) . Still use coating cutting tool additionally (TiCN, tiAlN) . The experiment is in F.

Deckel Type FP3A CNC gets mill machine tool aspirant travel. Used avirulent without pungent cooling fluid, include degradation of content of exceedingly of fine of A(of adipose pure product) with product B(fast biology degradation) and a kind of fatty acid ester () of complete biology degradation. Law getting cuts the MMS that uses dry type cutting, the cooling fluid after pulverization compresses air to mix together again, from exterior gush to broach. Unit of supply of minimum cooling fluid is Rexim Typ31105. Nozzle and cutting tool apart make an appointment with 30mm, nozzle diameter wants than broach diameter big, the cooling fluid in season that has 30% about arrived broach. With internal diameter side quantity appearance is measured different board bore diameter. 2 tests result and analysis 2.

1 auger cut aluminium - when the aperture of titanium answer plywood is undertaking getting cutting to Al-Al+3 × 2Ti, the aperture that discovers the 1st Al board is smaller than the diameter of the 2nd Al board, but all be more than titanium the aperture of alloy board, of aluminium board aperture inside the surface submits not flowing form. To find out its reason, measured respectively get alone cut aluminium to pull answer plywood, titanium board is compound board with Al-Al+5 × the aperture of 2Ti answer plywood. Can see, be opposite aluminous - when titanium answer plywood undertakes getting cutting, the aperture that the aperture of aluminium board compares titanium board is big, and exceeded tolerancepublic errand license; But getting alone cut aluminium board or when titanium board, each board bore diameter all is inside allow poor limits. Auger cut aluminium - the configuration cutting bits of titanium alloy. Titanium stage gold cuts bits to be classified not easily, show roughly irregular successive zigzag, this is be out of shape by inhomogenous plasticity, ministry of periodic extruding standoff cuts be caused by of wind shear form. The attrition that titanium alloy cuts bits is generation aluminium - the prime cause of out of tolerance of titanium alloy aperture. Experiment discovery, Ⅰ cut bits less, Ⅱ cut bits to be opposite with Ⅲ titanium alloy the bore diameter impact of aluminium board is the biggest. Accordingly, control titanium alloy cut bits to pour out of a quantity to reach the form that cut bits, it is to rise answer the main method of plywood aperture quality. 2.

2 influences are aluminous - the influence of different cooling fluid to bore diameter is opposite the main factor of aperture of bore of titanium answer bedplate the aluminium with relatively small ply - when titanium alloy undertakes cooling fluid affects research, get with aperture of Huo of TiCN coating VHM with constant feed speed is gotten cut. Tool of avery kind of drilled about 400 hole. Quantity of cooling fluid supply is 0.

40ml/min; Every Kong Zuan cuts time to make an appointment with 3s, use cooling fluid is measured about 0.

02ml. Getting cut Al-Ti(4.

5+1.

When 2mm) answer plywood, as a result of sharp hardness high titanium stage gold cuts bits with stage gold in discharge process board photograph chafes, make aluminium alloy board bore diameter wants than titanium alloy aperture big. Aluminium alloy board public errand of bore diameter dimension distributings to be mixed at H8 between H9, and public errand of board aperture diameter is in titanium alloy only under H8. To 3 kinds of cooling fluid, the average diameter public errand of alloy board all is between H8 ～ H9, about the same, titanium alloy board diametical change is very little also, both differ 15 ～ 20µm: Aluminium alloy board go up the diameter of aperture is fluctuant and ambitious at titanium the wave motion of alloy board diameter. In getting the test result that cuts 400 hole, error of the aperture when be sent on a diplomatic mission of bore diameter distributinging show uses fatty acid is the biggest. But when using another akin cutting tool to undertake filling checking check, discover this kind of phenomenon already not answer existence, the deviation of cutting tool existence that this may make clear to business of cutting tool supply and marketing is offerred, it is very big to the influence of bore aperture. Expression of this kind of deviation is in edge tool cutting edge angle (the biggest differ the horn after 020") , feed (the biggest differ the horn before 100") , feed (the biggest differ width of 020") , first flank (the biggest differ 0.

03mm) , and the wave motion of the sharp degree of face of edge around knife and exterior surface roughness. Feed speed uses A1-Al+3 × to the influence of bore diameter 2Ti board undertook feed speed experiments to the influence of bore diameter. Test result makes clear, use not when coating cutting tool answer the fluctuant limits of plywood aperture and feed speed have nothing to do. But when using coating cutting tool, as the addition of feed speed, titanium board aperture differs 5µm, bore diameter average increases. Inside limits of Vc=5 ～ 30m/min, aluminium board aperture differs 20µm. Because feed rate is higher,this is, temperature is elevatory, successive model the proportion that titanium alloy cuts bits is larger, increase to getting the effect that pulls bore diameter. After feed rate increases, rate of the eduction that cut bits rises, attrition increases. Auger cut temperature to rise to also make MMS cooling somewhat the action result of pulverization fluid is reduced. Broach vertex angle uses two vertex angle to differ to the influence of bore diameter but other geometry parameter is identical not broach of coating twist drill, get respectively cut 25 A1-Al+3 × aperture of 2Ti answer plywood. Increase as what get part of the top of head, the aperture of aluminium board increases, ～ of ° of horny σ =140 supports in broach between 165 ° when, bore diameter average differs make an appointment with 20µm, and bore diameter wave motion differs very big, exceeded H11 of the deviation on the permission of aperture even. But broach vertex angle to titanium the influence of alloy board aperture can be ignorred. Afore-mentioned results and hole depth are relative also. Pull in the 2nd aluminium apparently place, bore diameter is the biggest: Aperture shows cough form, and titanium alloy board the opening that attend still is cylindrical. 2.

3 improvement are compound board the method of bore dimension precision increases journey of bits of the platoon that retreat a knife to add route of bits of the platoon that retreat a knife, the titanium alloy that eduction makes cuts bits, reduce its to aluminium alloy board the influence of bore diameter. Getting when cutting Al-Al+8 × 2Ti, experimented two kinds of methods of drill through. A kind of method is to be being gotten the knife is retreated before cutting the 7th titanium board; Another kind of method is to use the route that retreat a knife twice, getting namely before cutting the 7th the 4th layer, titanium board, each retreat a knife, right now the exterior quality of aluminium board aperture compares those who retreat knife journey to be close friends, the bore diameter average of the 2nd aluminium board already was inside H11 limits. Used reaming means treatment to give out to machine Al-Al+8 × at the same time the bore diameter dimension when 2Ti board, namely beforehand bore, use law of bits of the platoon that retreat a knife 2 times to undertake reaming is machined again. Reamer (get bore diameter beforehand for 4.

Before 8mm) getting cuts the 7th the 4th layer, titanium board, each retreat a knife, can make bore diameter accords with quality requirement completely. Reduce width of broach first flank to reduce width of broach first flank to be able to improve cutting to accept force and platoon bits condition. In will normal blade wide by O.

50 ～ 0.

60mm is reduced 0.

20 ～ 0.

After 25mm, machine Al-Al+8x2Ti board when, the bore diameter wave motion of titanium board is very small, the bore diameter wave motion of aluminium board and average all drop, bore diameter can accord with quality requirement completely. Experiment of the horn before increasing feed makes clear, machine Al-Al+8x2Ti board when, the horn before feed rises significantly in the bore diameter quality of the 2nd aluminium board when increasing 30 ° . Nevertheless, right now need considers the strength of cutting tool. The cutting tool blade that uses in the experiment already undertook round horn enhances processing. Broach of use a flight of stairs uses broach of a flight of stairs to be able to get first-rate bore quality. The result that the experiment gets the treatment that retreat a knife and a flight of stairs to get 2Ti of × of Al-Al+8 of the treatment that retreat a knife to using Huo opening undertook contrast. The bore diameter error that when use a flight of stairs is gotten aluminium pulls is the smallest, titanium board aperture is the same as broach diameter almost identical. The position that retreat a knife is very important likewise surely really. 3 conclusion titanium board the attrition that cuts bits wears away action, it is to create range of wave motion of aluminium board aperture deviation of value of bigger, average aperture is mixed greatly the reason of form of the horn in aperture. 3 kinds of cooling fluid that the experiment uses cut bore diameter to affect to getting not quite. When be being machined with coating cutting tool, auger cut bore diameter to show direct ratio with feed speed. Broach vertex angle is bigger. The aperture of aluminium board is bigger, but the aperture of titanium board is changeless. Use bits of the platoon that retreat a knife and reaming means treatment, reduce first flank width, the horn before increasing feed and broach of use a flight of stairs can reduce the deviation of bore diameter, assure to machine bore diameter quality. CNC Milling