Aluminium alloy high speed is little Kong Zuan cuts craft

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Tiny Kong Zuan cuts aluminium alloy treatment and aluminium alloy of its craft difficulty are the alloy floorboard that gives priority to with aluminium, wait for alloying element through adding copper, silicon, magnesian, zinc, manganese and nickel, iron, titanium, chromic, lithium, in maintain aluminium to wait for an advantage gently character while, its " than intensity " can surpass a lot of alloy steel, make good structural material, use extensively at machinery to make, the respect such as carriage machinery, motivation machinery and aviation industry. The commonly used aluminium alloy such as the airframe of the plane, envelope, compressor is made, in order to reduce self-prossessed. Its model utility still includes hub of component of lamina of rivet of structure of impeller of head of cylinder of engine of aircraft engine and derv engine piston, aircraft, reaction engine, aerostat, airscrew, missile, lorry, reserve container, thin plate is machined, cupping. On the other hand, of the development as science and technology and most advanced product increasingly accurate change, compositive change and miniature is changed, the amount that tiny Kong Jia is versed in is increasing, taller and taller also to machining the requirement of quality. Although machine the technique of small hole to have a lot of, stimulate beam of light, electron beam, ion for example bundle wait with electric spark treatment, but applying domestic and internationally the most extensive, practical the strongest remain drill of twist drill machinery [1] . Aluminium alloy intensity and hardness are relatively inferior, right cutting tool wears away small, and thermal conductance is taller, make cutting temperature inferior, the cutting processability of aluminium alloy is so better, belong to easy treatment material, comfortable at cutting of taller cutting rate. The rotate speed of the main shaft when high speed getting is cut is in normally 10000r/min above. But, aluminium alloy melting point is inferior, the plasticity after temperature is elevatory increases, below action of high temperature high pressure, power of attrition of the interface that cut bits is very great, knot of the Yi Rong that cut bits is on edge and stick a knife. Edge also can be caused to be short of caustic when frit writtens guarantee content is pounded to fall off by follow-up treatment [2] . Afore-mentioned cutting processability of aluminium alloy make his tiny Kong Zuan cuts treatment to exist difficulty of a lot of craft. Because,this is, get cutting treatment is one of methods of treatment of cutting condition worst, and auger cut alveolus, especially diametical 1mm and the following alveolus, not only centered plunge the full difficult point that cuts treatment, and cutting condition is commonner bore diameter getting is cut more abominable. Particular system now the following respects [3-4] . (1) reduce and drop quickly what bore length compares what the stiffness of little bit follows bore diameter. To make up for the inadequacy of little bit stiffness as far as possible, the ply getting core of little bit is opposite bigger: The ratio of the ply getting core of the broach that the diameter is more than 1mm and broach diameter is less than normally 0.

2, and little bit is commonly 0.

3~0.

4. The ply that get core is big, horizontal blade chamfer of wide, helix is shallow, auger cut conditional aggravation. Enter when getting, horizontal blade can make get a needle to express face move about in the job, destroy get fixed position precision, horizontal blade is wider, go from place to place is more serious. Get blade of the horizontal stroke when cutting to be in deputy before horny cutting position, horizontal blade is wider, cutting fights force bigger, the negative charge of broach is bigger also. The function of broach helix chamfer basically is look bits, platoon bits is mixed guide cutting fluid. Helix chamfer is shallow, allow bits ability difference, discharge bits difficulty, cut bits and already machined exterior scratch serious, affect exterior quality, cause easily cut bits to jam, at the same time cutting fluid reachs cutting area hard, extreme difference of cooling and lubricant effect. Closely related exit burr and axial cutting force, and axial getting cuts force to basically come from Yu Hengren, horizontal blade is wider, axial getting cuts force bigger, exit burr is more serious. (2) twist drill head belongs to structural appearance to compare complex cutting tool, to ease the friction of oriented part and hole wall, standard twist drill is made in oriented part have narrower arris side, and from outside the circle makes drill to the rear, form narrower deputy hind blade face and those who be more than 0 ° is deputy slant blade horn. The most extensive to application high-speed steel is little twist drill head, to raise its stiffness, intensity and from facilitate production consideration, mix without arris edge normally awl, form deputy hind what horn is 0 ° is wider deputy hind blade face and 0 ° deputy slant horn, get so oriented part and hole wall attrition are serious in cutting a course. The abominable craft condition that cuts as a result of the blemish of oneself structure and tiny Kong Zuan, tiny twist drill applies at aluminium alloy small alveolus is machined, auger slant, stick a knife, cut bits to jam, twine wait for a problem to often cause broach to break off, and break off to be taken out very hard from inside workpiece partly, often discard as useless with workpiece and end. The dispersive sex of little bit life is great, because this is below a lot of circumstances, getting especially when cutting precious work, must be in far when reaching broach life average, change broach ahead of schedule, create broach and the great waste that assist man-hour. Tiny Kong Zuan cuts broach avoids to break off in treatment, the way that raises workpiece of broach life, protection basically has 2 kinds: It is the cutting function that is aimed at workpiece material, recommend optimized cutting parameter, reduce cutting force, raise broach durability. 2 it is online real time is monitored auger cut a course, when reaching the threshold value that monitor forecast changes a knife, will raise broach utilization rate. This task is gotten through many aluminium alloy small alveolus cut an experiment, force of cutting of the trends in studying high speed getting cuts a course (axial force and torque) metabolic feature, and auger cut craft parameter to be opposite the influence rule of dynamic cutting force. From this, with cutting force the smallest to optimize a target, get through optimizing cut craft parameter to realize aluminium alloy the improvement that tiny Kong Zuan cuts technical properties, raise broach durability. Tiny Kong Zuan cuts aluminium alloy tiny Kong Zuan cuts experiment aluminium alloy undertake on the drilling machine of high speed numerical control that experiments to be developed in a proper motion, the main technique parameter of this drilling machine is: Machine bore diameter 0.

2~1mm, machine deepness 0~8mm, 27000r/min of rotate speed of highest main shaft, feed speed 0~1mm/s. Test system sketch map is shown 1 times like the graph, workpiece is installed go up at workbench, with 4 claw chuck is secured. The installation on workpiece has meet an emergency piece type axial force - torque measures power instrument 2 minutes, its span is 20kg and 500N · Mm respectively, precision 3 ‰ . After the 2 output signal of sensor magnifies via measuring amplifier of the buy inside power instrument, join grinds China the A/D sampling end that data of 16 high speed of company collects card, the disperse after sampling changes data to input the computer to so that sequel analyses processing,be saved. The sampling frequency when measuring is 2000Hz. When high speed cutting machines aluminium alloy, can have hard alloy, pottery and porcelain, cermet for the cutting tool material of the choice, get together brilliant diamond. The twist drill of hard alloy standard that the experiment uses diametical 1mm is on aluminium alloy workpiece bore, do not use cutting liquid. YG6A of cutting tool material, workpiece is LY12 duralumin alloy. The main shaft rotate speed of the experiment is 8000~22000r/min, feed speed is 12~60mm/min. When rotate speed of change main shaft or feed speed machine each aperture, collect the axial force in each bore process and torque data, study aluminium alloy small alveolus gets cut signal feature, undertake analytic handling to data, rotate speed of further research main shaft and feed speed cut the influence pattern of force to getting. Graph 2 it is 12mm/min of speed of 16000r/min of main shaft rotate speed, feed the axial power that Kong Shi of blind of one φ 1mm gets to be measured on aluminium alloy workpiece below experiment condition and signal of torque time domain. The abscissa in the graph is sampling check the number. If the graph is shown 2 times, entering auger, auger cut and the force of cutting of 3 phase broach that withdraws a knife change of signal step sex is very apparent. Farther, getting in cutting a course, increase as what get aperture deepness, increase gradually into what get broach part to grow diameter to compare, it is difficult that platoon bits tends, auger cut conditional aggravation, axial force and torque show the trend that raises gradually. The axial force of such characteristics and signal of torque time domain are in the experiment very general. Once appear,cut bits to jam, axial force and torque exceed the limit, the bit with little diameter breaks off namely. Study aluminium alloy small alveolus gets cut experiment to also make clear, cut bits to jam the main reason that the bit that create breaks off is broach attaint. Small alveolus of Nextpage aluminium alloy gets the influence pattern that cuts craft parameter to affect aluminium alloy small alveolus to get the factor that cuts technical properties, remove cutting tool material beyond, basically be main shaft rotate speed and feed speed auger cut craft parameter. This section according to afore-mentioned aluminium alloy tiny Kong Zuan cuts test result, to collection bore process getting cuts force (axial force and torque) data undertakes analytic handling, rotate speed of exploration main shaft and feed speed cut the influence pattern of force to getting, cut craft parameter to get the effect that cuts technical properties to aluminium alloy small alveolus with considering to get further. Getting the data that cut force to analyse the method of processing is, add the axial power that measures in labour and torque data in the light of each aperture, beg its respectively getting the average that cuts level data, force of axial of susceptive of the broach in be being machined as this aperture and torque test value. Rotate speed of 1 main shaft undertakes aluminium alloy to getting the influence law that cuts force tiny Kong Zuan cuts an experiment, main shaft rotate speed makes an on-the-spot investigation to cut the influence of axial force and torque to getting below the different feed speed of 12mm/min, 24mm/min, 36mm/min, 48mm/min and 60mm/min. Main shaft rotate speed is 8000~22000r/min. Graph 3 with the graph the 4 collect of data of force of the axial in each aperture treatment and torque test when playing rotate speed of change main shaft for different feed speed respectively pursue. From this knowable and overall trend is: Increase as main shaft rotate speed, axial force and torque are reduced gradually; When main shaft rotate speed is 16000r/min, axial force and torque are the smallest; Later, increase as main shaft rotate speed, axial force and torque begin to increase gradually again. Afore-mentioned rules not because of feed speed differ and change. Nextpage2 feed speed undertakes aluminium alloy to getting the influence law that cuts force tiny Kong Zuan cuts an experiment, the different main shaft in 8000r/min, 10000r/min, 12000r/min, 14000r/min, 16000r/min, 18000r/min, 20000r/min and 22000r/min inspects feed speed to cut the influence of axial force and torque to getting below rotate speed. Feed speed is 12~60mm/min. Graph the 5 gather that with the graph small alveolus of the 6 aluminium alloy when leaving change feed rate for rotate speed of different main shaft respectively gets data of force of the axial in cutting treatment and torque test pursue. Same, overall trend is: Increase as feed speed, axial force and torque are reduced gradually; When feed speed is 36mm/min, axial force and torque are the smallest; Later, increase as feed speed, axial force and torque begin to increase gradually again. Afore-mentioned rules do not differ because of what be main shaft rotate speed and change. Analysis of 3 tests result can be reached by above test result, aluminium alloy small alveolus gets the rotate speed of optimal main shaft in cutting is 16000r/min, optimal feed speed is 36mm/min. Undertake below this cutting condition bore is machined, axial force and torque are the smallest. According to metallic cutting mechanism, cutting force is small, the quantity of heat that cutting produces is little, cutting area temperature is low, the phenomenon sticking a knife such as knot of the frit that cut bits decreases, edge wears away and be short of caustic to decrease not only, and knife bits attrition is reduced, cut bits to be in rational improvement, the risk that cuts bits to jam is reduced. Accordingly, be helpful for avoiding cutting tool to break off, prolong cutting tool life. Be transformed by cutting result and heat in metal cutting comes, include the quantity of heat that stretch, plasticity is out of shape the quantity of heat of generation and all attrition arise among them. Main shaft rotate speed and feed rate increase, unit excision rate increases, cutting result increases, the heat in metal cutting of change increases. When use cutting fluid, heat in metal cutting basically is taken away by cutting fluid; Need not when cutting fluid, heat in metal cutting is main by cut bits, workpiece and cutting tool are taken away or come out. Common get the proportion that agency heat in metal cutting conducts heat to come out each when cutting to cut bits 28% , workpiece 52.

5% , cutting tool 14.

5% , all round medium 5%[5] . Below condition of high speed cutting, heat in metal cutting is cut the scale that bits takes away increases greatly. And cutting rate is higher, jump over by the quantity of heat that cuts bits to take away much, the quantity of heat that passes into workpiece and cutting tool is less [6-7] . In 8000~16000r/min and limits of feed speed 12~36mm/min, increase as main shaft rotate speed and feed speed, after cutting result increases although the quantity of heat of generation increases, but be less than cut bits to carry fast hind the quantity of heat that take away, cutting area thermal drop is small, knot of frit of the interface that cut bits decreases, cutting performance improvement makes get cut force to reduce. And after main shaft rotate speed exceeds 16000r/min and feed speed 36mm/min, be in namely 16000~22000r/min and limits of feed speed 36~60mm/min, increase as main shaft rotate speed and feed speed, the quantity of heat of the generation after cutting result increases increases, but because turn ability of bits of platoon of chamfer of head look bits is limited, carry fast the cuts bits to be able to be taken away quantity of heat after is finite, cutting area temperature is elevatory, auger degenerative layer is built in cutting a course, knot of the Yi Rong that cut bits is on edge, the frit that cut bits writtens guarantee content is machined to pound cutting by sequel, make get cut force to increase. Can think, 16000r/min and 36mm/min are critical condition. In this critical condition falls, the generation that aluminium alloy small alveolus gets the heat in metal cutting in cutting a course and take away or come out achieved first-rate trends to balance, cutting force is the smallest, durability is highest. Accordingly, 16000r/min and 36mm/min are the rotate speed of optimal main shaft that tiny Kong Zuan cuts aluminium alloy and optimal feed speed. Last word this task cut an experiment to undertake aluminium alloy small alveolus gets the research that cuts character and craft through be being gotten in great quantities. Tiny Kong Zuan cuts aluminium alloy undertake on the drilling machine of high speed numerical control that experiments to be developed in a proper motion. The twist drill of hard alloy standard that the experiment uses diametical 1mm is on aluminium alloy workpiece bore, do not use cutting liquid. Cutting tool material is YG6A, workpiece is LY12 hard alloy. Main conclusion is as follows: (1) high speed getting cuts force of process trends cutting (axial force and torque) metabolic feature considers to make clear, as bore development, increase gradually into what get broach part to grow diameter to compare, platoon bits gradually difficult, auger cut conditional aggravation, make axial force and torque show the trend that raises gradually, once exceed the limit,bring about little bit to break off namely. Cut bits to jam the main reason that the bit that create breaks off is broach attaint. (2) aluminium alloy small alveolus gets the influence pattern that cuts craft parameter to consider to make clear, auger cut craft parameter (main shaft rotate speed and feed speed) exist to the influence of dynamic cutting force critical value (namely optimal craft parameter) : 16000r/min of main shaft rotate speed and feed speed 36mm/min. In this critical condition falls, the generation that aluminium alloy small alveolus gets the heat in metal cutting in cutting a course and take away or come out achieved first-rate trends to balance, undertake tiny Kong Zuan cuts aluminium alloy treatment cutting force is the smallest, be helpful for improving aluminium alloy tiny Kong Zuan cuts a condition, raise cutting tool durability. A CNC Milling CNC Machining