Cubic helium changes boron (CBN) processes medium application in cutting
- source:XIMENG CNC Machining
Use hard steel of temper by dipping in water of vehicle of fine of PCBN cutting tool with of of of hard steel of temper by dipping in water of vehicle of fine of PCBN razor blade, 45HRC of prep above of its workpiece hardness, the effect is best. Its cutting speed is 80 ～ commonly 120m/min, workpiece hardness is taller, cutting speed appropriate takes low cost, if car hardness is the workpiece of 70HRC, appropriate of its cutting speed chooses 60 ～ 80m/min. Of fine vehicle cut be in greatly 0.
1 ～ 0.
3mm, feed is in 0.
05 ～ 0.
025mm/r, the workpiece surface surface roughness after fine vehicle is Ra0.
3 ～ 0.
6 μ M, dimension precision can be amounted to 0.
013mm. If can use the lathe of standard numerical control with good tigidity to machine, the tigidity of PCBN cutting tool is good with point sharp, criterion the workpiece surface surface roughness after fine vehicle can amount to Ra0.
3 μ M, dimension precision can be amounted to 0.
01mm, can reach the level that machines with numerical control grinder. If the machine tool is rigid good, chosen cutting career is inferior, choose PCBN compound razor blade but fine vehicle is intermittent the surface. Mental allowance is fine vehicle commonly 0.
3mm left and right sides, the dimension precision before raising workpiece to quench as far as possible and reduce heat to be out of shape, in order to make sure surplus of the cutting when fine vehicle is even, prolong the service life of PCBN cutting tool. Car of essence of life is average need not cutting fluid, because be below higher cutting rate, many heat in metal cutting by cut bits to take away, very few meeting stays in workpiece surface and the influence machines exterior quality and precision. Appropriate of fine vehicle razor blade chooses the razor blade of 80 ° lozenge with intensity and tall tenacity, radius of point of a knife is in 0.
8 ～ 1.
Between 2mm, to protect cutting tool point, before using, need to pour arris with fine oilstone. Hard work of fine vehicle temper by dipping in water is a new technology, before carrying out, need to do craft to experiment, can use as same as workpiece material, hardness and size good material, undertake on congener machine tool finish machining or rough machining experiment, the key is to want the choice of experiment cutting tool and cutting parameter and machining complex to whether have enough tigidity. At present home has used this technology, if one steam group uses PCBN cutting tool to machine cementite to quench (the 20CrMnTi gear-box gear of 58 ～ 63HRC) dials fork pockets, adoption craft parameter is υ C=150m/min, f=0.
1mm/r, α P=0.
2 ～ 0.
3mm, came true to be ground with car generation. 2.
Treatment is good cast-iron with grey mouth of of cast-iron (when 1) machines of of hard cast-iron to use hard steel of temper by dipping in water of turning of PCBN cutting tool, requirement workpiece quenchs hardness prep above 45 ～ 55HRC, treatment is good cast-iron when, hardness level waits in wanting hardness to achieve only (45HRC) , can obtain favorable treatment result. Like car engine the crock builds the exhaust valve base that go up, this valve base is to use the data of tall chromic alloy cast iron that contains copper, molybdenum, its hardness is 44HRC about commonly, the Kong Cai on its valve base uses Huo (bore with a reamer) , car two kinds of craft, it is mostly machine on special transfer matic, with conduit of gun bore with a reamer aperture undertakes together. Uses cutting dosage is: υ C=71.
6m/min, υ F=26.
5mm/min, α P=1.
0mm, use BC broaching oil, after using PCBN cutting tool to machine, machine photograph comparing with all sorts of hard alloy bit that use before, average durability is cutting tool 1200, treatment surface surface roughness is Ra0.
4 μ M, valve base face places poor ≤ 0.
05mm. The factory used motor of east wind Motor Corporation 1988 oneself after PCBN cutting tool, its effect keeps stable all the time, the cutting tool that better land solved imported equipment is homebred turn an issue. (Grey mouth of milling of 2) high speed is cast-iron when casting pig of milling of high speed of , general rough machining can use K of course kind hard alloy, finish machining can change bit of silicon pottery and porcelain with helium. If be in,a Duan Xi of 8 razor blade converts on the knife the two PCBN razor blade that fits symmetrical pattern only, raise cutting rate 4 times, its are a metal as a result excision rate is same, and cutting force drops however 3/4, cutting tool life and treatment quality exceed former. Cast-iron to pearlite with cold hard cast-iron, also appropriate uses PCBN cutting tool to undertake high speed is machined, compare with material of other cutting tool, can raise cutting rate, prolong cutting tool life, reduced exterior surface roughness. 3.
of of of aperture of cast of high speed boring is used on lever of high speed boring mount a PCBN boring cutter and sheet in couples piece boring cutter photograph is compared, it is good that its balance a gender, increased the tigidity of boring lever thereby, be in given below feed, use PCBN double razor blade to bore hole can obtain tall metal to excise rate and exterior quality. At present home already had more engine mill, the crock aperture to air cylinder body (or cylinder bushing) finish machining already used PCBN cutting tool. Be like the engine plant of Shanghai masses and one steam group, boring of crock aperture essence all uses PCBN bit and can compensate automatically (υ C=500m/min, f=0.
2mm/r, α P=0.
1mm) . Tall, dimension stabilizes the crock aperture precision that so treatment gives, and manufacturing efficiency is tall, cutting tool life is long. To alveolus boring, although can use pottery and porcelain or coating bit, but bit should contain the part before losing, this will increase cutting and the resistance that discharge bits, make lever of long and thin boring produces vibration easily. If use PCBN cutting tool to undertake high speed boring, the exterior quality of its aperture efficiency of good, production is tall. 4.
Bore with a reamer cuts hard steel of temper by dipping in water or of of of hard cast alveolus is opposite the Kong Jia of this kind of workpiece is versed in appropriate uses CBN to eletroplate reamer. This kind of reamer is with its hardness is 45 steel of 42HRC or 9CrSi steel to serve as matrix, have around to direct with cutting part, its matrix production precision wants tall, the design wants reasonable. The bellwether of if reamer should be less than diameter of cutting blade part to partial diameter 0.
04mm, the length of cutting area should be more than workpiece hole depth, oriented length should be more than cutting area length after, its diameter should be less than diameter of cutting blade ministry 0.
02mm. To be in bore with a reamer is cut in can rinse with cutting fluid cut bits and surface of cooling and lubricant treatment, leave on its reamer matrix have two deeper helix chamfer. If some factory is machined,quench φ of steel workpiece aperture 12.
06 ± 0.
05mm, hardness is 45HRC, bottom outlet dimension is φ 12 ± 0.
01mm, the cylinder of requirement aperture is spent for 0.
005mm, exterior surface roughness is Ra0.
2 μ M. Use a group 5 eletroplate after CBN reamer is machined, obtain better economic result. Some engine manufactories use diamond or CBN eletroplates the headstock aperture to air cylinder body undertakes reamer top gem bore with a reamer, replace original honing treatment, make machined efficiency to rise multiple, and quality is stable. 5.
The of of cutting treatment that is used at difficult treatment material is used belt before PCBN cutting tool of horn, choose proper cutting parameter, namely υ C=100m/min, f=0.
05 ～ 0.
2mm, α P=0.
1 ～ 0.
2mm, use extremely profiling emulsion or oily cooling fluid, can process austenite stainless steel (the material such as tall manganese steel, high strenth steel and alloy steel of 45HRC) , high temperature, tall nickel alloy steel, can acquire taller treatment efficiency and exterior quality. CBN emery wheel applies material of CBN of of mediumly to divide in grinding treatment outside using the cutting tool that make, its biggest application field still makes CBN grind, use at high speed efficient grinding and honing treatment, can make grinding efficiency rises greatly, its grinding precision and quality improve a grade. 1.
Grinding car spare parts- - the camshaft on camshaft and engine of car of of crankshaft has many cam, the cam kibble after quenching and essence grind the crucial working procedure that is influence cam quality. It is to use grinding of profiling profile modeling commonly, of workpiece speed rise be restricted, crackle of burn of grinding of workpiece easy generation, use grinding of profiling profile modeling, the curve should suffer round of corridor of its cam surface the influence of size of emery wheel diameter, what assure curve of cam annulus corridor very hard so is correct. Production carries out a proof, when emery wheel diameter is big, grind the cam that go out thin, when hour of emery wheel diameter, grind the cam that go out fat, when the gyro wheel diameter that be close to when emery wheel diameter only or is equal to grinding profiling cam (the general 570mm) that it is φ , error of its profile modeling is close to Yu Ling, grind the cam that go out namely curve of exterior annulus corridor is adjacent at profiling cam. In actual production, uses emery wheel diameter is commonly use D500 from D600(or 610) , the emery wheel diameter with ideal (570) differs very much, the cam curve that there always is major camshaft in be being produced so exceeds bid. To solve this problem, we use grinding of CBN emery wheel on grinder of cam of profiling profile modeling, can make diameter of CBN emery wheel into D575, CBN abrasive layer is thick for 4 ～ 5mm, its are ground annulus grinding is the smallest the diameter is D565, although grinding diameter limits has 10mm only, but number of grinding spare parts is equivalent to a few common emery wheel however, can make sure cam curve is correct not only, and also won't produce grinding burn phenomenon. If company of Liton industry automation uses camshaft of grinding of CBN emery wheel, its cost was reduced 50% , the fatigue intensity of cam surface rose 30% ; The factory uses oily motor of fencing bavin of assist of east wind Motor Corporation camshaft of Leng Jizhu iron of kibble of emery wheel of CBN of bond of pottery and porcelain, 5mm of ～ of T=4 of surplus of its cam grinding, υ arenaceous =60m/s, n=100r/min of workpiece rotate speed, υ F=0.
1mm/s, use liquid of high speed grinding, the life of CBN emery wheel is equivalent to emery wheel of 20 corundum abrasive basically. 2.
CBN emery wheel inside the efficiency of round grinding inside the of applied in aperture grinding all the time very low, its are main the reason is material of grinding speed, emery wheel reach the rigid issue that grinds lever character. In producing a course, use in nap emery wheel, change the time of emery wheel took sheet almost the 1/3 ～ 1/5 of man-hour. If inside circle or groove grinding use CBN to eletroplate emery wheel, raise emery wheel rate, increase grind shank diameter, can raise workpiece rotate speed and feed rate appropriately, can assure aperture not only (arc) broad measure of diameter, chamfer and form precision, exterior surface roughness and avoid burn, and OK still twice land improves treatment efficiency, reduce finished cost. Like home some factory treatment produces per year 600 thousand spin machine scroll bearing to cover, grind φ 15.
The aperture of 04 reachs the arc trough of photograph adjacent, used chromic corundum in the past (GG) emery wheel, need to part with two working procedure the treatment on round inside two M224 grinder, its chamfer (arc) the coaxial with aperture spends diameter difference and dimension to assure very hard, and efficiency is low, after using CBN emery wheel, add thick grind lever, raised feed, managing nap and change the time of emery wheel, solved original problem thoroughly. Hind instead aperture, channel is ground at the same time, grinding lever to make up namely two emery wheel, make grinding efficiency raises 1 times, saved a grinder. Machines workpiece surface surface roughness is Ra0.
The grinding craft parameter that 63 μ M uses: υ arenaceous =36m/s, υ 2=19m/min, f is thick M/r of the μ that cut =1, f essence cuts =0.
5 μ M/r, light grinds time T=bs, use value of emulsification of 10% pH indicator. 3.
Using grinding of gear of of of of gear of grinding of CBN emery wheel is to use odd tooth flank and grinding of much tooth flank before, although grinding of odd tooth flank can obtain taller treatment precision, but efficiency is low, cost is high, although grinding of much tooth flank manufactures efficiency tall, but its machine quality to age than sheet grinding is differred. If use grinding of CBN emery wheel, no matter use grinding of odd tooth flank to still use grinding of much tooth flank, use eletroplate CBN emery wheel or emery wheel of bond of pottery and porcelain undertake grinding, its effect is very distinct: (1)CBN emery wheel can make the tooth form with taller precision, because durability is tall, not frequent nap, do not need to often adjust a machine tool, can obtain stable tine corridor, lead and pitch precision. (2) can realize high speed grinding and tooth flank of grinding of tall feed rate, surface roughness is low and won't burn, taller gear precision can be obtained below the condition that improves grinding efficiency (7 class of 6 ～ ) . (Life of 3)CBN emery wheel is long, grinding performance is good, managing emery wheel changes nap, machine tool is adjusted and workpiece detects wait for a lot of auxiliary time. 4.
It is difficult that applied CBN grinds a treatment treatment material and of of of difficult treatment face are right hard steel of temper by dipping in water or cold hard cast-iron a honing of aperture, can use CBN honing oilstone, mix to high strenth, tall hardness the alloy steel of sex of high fever quick, stainless steel, refractory steel and alloy, appropriate uses the CBN emery wheel of tall hardness, high strenth, use extremely press emulsion or fluid of high speed grinding to undertake cooling. To longer slideway face or complex model the profiling axis of grinder of face, cam all appropriate uses CBN emery wheel. The application of material of big thrust wide CBN in machining key working procedure no matter material of CBN of of is made cutting tool or make grind, apply at high speed cutting or grinding, can receive improve product quality, improve treatment efficiency, shorten treatment cycle and reduce the distinct effect such as finished cost. Accordingly, in treatment, knife of big thrust wide CBN (grind) providing is the strong step that improves production technology. Dan Repu alls over promotion to use, still have a lot of problems. Popularize use CBN knife better for aborning (grind) , should do the work of the following respects: 1.
Play CBN knife (grind) provide an academy () of of dominant action is current manufacturer of domestic CBN material the home is very much, output is not little also, but of high quality not much, CBN knife (grind) provided stable user is fewer. Investigate its reason basically is the CBN knife with machining costly to the price branch (grind) have devoid choice and devoid knowledge, purchase the CBN tool actual effect that come not much, in its the condition with constrictive economy falls, dare not invest easily undertake craft experiments. Want to solve this problem, have CBN knife only (grind) provide an academy () the manufacturing unit that active and thorough machinery creates, the choice produces the weak point of efficiency and quality, and the spot that already was had or creates CBN to machine a condition easily, talk things over with the user sign joint development CBN to use a contract. The CBN knife that by the tool development unit is in charge of offerring an experiment freely to use (grind) , the user is in charge of offerring experiment place to need the organization below the condition to produce a test. This was developed with all possible means enthusiasm, choose to be made to the tool from CBN quality, can undertake with the best, rapiddest rate, the user arrives from preparative experiment condition use, saw the gain that achieves contract aim cost, cost of not beautiful experiment solved manufacturing difficult problem, popularize very easily. And tool courtyard () Yi Ke is in the following in offerring money, reclaim stage by stage profit, want both sides to retain mutually beneficial, mutual benefit only, synergic relationship is met more consolidate. My factory uses this kind of means and much home academy namely (school) developed a lot of new technologies. 2.
Realize 3.1 line to combine development, namely CBN- - the tool is made- - user or CBN and tool are made- - machine tool- - the applied that the user develops CBN jointly its reason is many sided, if norms of CBN quality, content, brand reachs bond,wait to whether suit the treatment with cast-iron boron. The element that grinds the grinding effect that has an effect as to CBN is more, the quality that removes oneself raw material, outside deserving to compare and grind a production technology, still have use condition and technology. Be like grinding speed (speed of grinding of applied high speed) , grinder tigidity is good, without vibration, automatic and careful feed and nap compensate orgnaization, proper grinding parameter and cooling fluid to wait, these are the main factors that supplement each other, rely on to concern respect joint efforts, improve the quality of oneself product severally, promote each other, ability makes CBN tool and special device are used successfully at production. 3.
Begin CBN knife actively (grind) make the user of of research with use technology hope to use an effectual CBN tool, for this, requirement tool creates an unit, besides the production technology that improves CBN tool as soon as possible, the quality that still answers a product establishs specific appraisal standard and method, distributing certain performance data, the CBN content that is like cutting tool and brand, grind provided hardness and CBN precision, chroma to wait, undertake manufacturing use a test on this foundation, so that fill the manufacturing experience that distributes brandish user, the treatment that obtains to different cutting parameter and cooling fluid place undertakes contrasting analytic as a result, make CBN tool gets rising character. The technical form a complete set of the suitable scope of CBN tool, use condition and application (wait for) like equipment and cooling fluid, the user can be chosen correctly and use CBN tool. 4.
The user needs to increase product quality awareness, be brave in to increase 21 centuries of of of of production technology is high-tech times, the product must be to high-powered, high quality just has the market, the enterprise just has vitality. For this, answer to raise production technology level as soon as possible, and promotion uses CBN tool to improve production technology is a kind of strong step, what this needs to concern director branch not only is strong aid financially and support, the technical form a complete set that organization, designedly popularizes CBN tool stage by stage and use, also ask the user is brave in to accept new material, new technology at the same time, change old-fashioned in the past production concept and administrative method, namely knife (grind) all use up cost index very low, make the 1/100 left and right sides that holds product cost only, is not in order to increase production efficiency and make sure product quality is accurate, the knife with such meeting high grade and efficient limitation (grind) the play that has application and advanced equipment productivity. Carry out a proof, CBN knife (grind) the treatment quality that provided effect can improve a product not only, and also can raise economic benefits. CNC Milling CNC Machining