Laser aggrandizement technology applies in modified of cutting tool material

Any tantalum are not added commonly when the surface is fused, frit coagulates layer and material matrix form are united in wedlock into metallurgy. 2.

Coagulate in laser frit in the process, can remove foreign matter and gas, the magazine that at the same time urgent cold recrystallization acquires has taller hardness, wearability and corrosion resistance. 3.

Its frit layer is thin, hot action area is small, not big to exterior surface roughness and work measure impact. Can undertake sequel burnish no longer sometimes and use directly. 4.

Raise solute atom to spend the maximum in dissolve of the solid in matrix, 2 photographs particle exceeds grain pass an imperial examination refine, form metastable photograph to be able to be obtained be not brilliant condition even without diffusing single crystal structure, the new-style alloy that makes generate thereby acquires the admirable property that traditional method cannot get. 5.

Beam of light can direct through smooth road, can handle a part consequently the surface with special place and complex form. 2, modified of surface of laser of cutting tool material studies general situation is current domestic and internationally domestic and international the document related to this is more, if use XeCl to follow molecular laser (wavelengh 308nm) rice of illuminate Al2O3-SiC accept is compound sample of pottery and porcelain, energy density is in 0.

8J/cm3~6.

Inside 0J/cm3 limits, after illuminate, exterior blemish is eliminated, form the fused layer of the smooth level off that distributings continuously, appear metastable photograph γ - Al2O3, as a result of the change of the improvement of exterior form appearance and structure, make exterior tenacity gets rising. After laser of classics of surface of W18Cr 4V lathe tool besmears Fu is handled, especially hard to deep cutting, fast cutting and cutting, wearability has rise apparently, after be like, knife face is ground it is a standard dully, raise nearly 250 ％ ; If knife face is ground before,be a standard dully, raise 200 ％ ; If be a standard with damaged, raise nearly 100 ％ . In addition after laser of face of the knife before lathe tool is handled, the wearability of knife face has apparent growth after; After knife face laser is handled after, knife face fights crescent moon to wear away depression before ability also has rise certainly, but increase scope not as good as former. The Xuan Chongwu of Beijing industry university, Zhang Lianbao uses laser surface alloy to change new technology, change lumber machines the exterior composition of bit, in order to raise bit tenacity. Laser surface alloy changes the alloy of earning is union of a kind of metallurgy between layer and bit matrix, adhesion excel all sorts of gush coating. Blade grinds optimal product average yield <20t, but bit itself folds caustic to lead > 30 ％ . Laser alloy changes the bit after processing, blade grinds life to rise more on average than optimal product 3 times the left and right sides, and edge does not die, do not coil, do not break off, grind blade to be able to continue to use slightly. The classics test and verify that using law of laser beam machining to raise cutting tool durability without the Li Liangfu of stannic metallurgy machinery plant is solid, laser aggrandizement has better effect to improving the working ability of all sorts of cutting tool. For example the durability of T8A, T10A, CrWMn and 9Cr steel mould can rise a certain number of times, shape the service life after commonner heat treatment can improve modular life 15-19 times, relatively the pattern that nitrogen changes cobaltic wear-resisting layer rises 0.

5-1 times. Russia ever was mixed to WC85%+Co15% before powder of two kinds of hard alloy undertakes WC92%+Co8% laser frit Fu experiments, the solid pulse laser of use 35-30J and 0.

1, 0.

5, the successive CO2 laser of 1-3Kw, scanning speed 2.

2-17mm/s, in Fu of the frit on matrix of Y8A tool steel (WC92+Co8) pulverous earning is highest and microscopical hardness is HV1180. KJ.

Schmaxtjko uses accurate element laser to be opposite material of pottery and porcelain (the surface of Al2O3, ZnO2, Si3N4) undertakes remelting modified directly, the result makes clear: The exterior surface roughness of material of pottery and porcelain from the 10-15 μ M before laser modified, drop 1-4 μ M, and hole rate falls greatly. A.

The remelting means of Detitbon can make exterior crackle and hole drop at least 50% . The last few years, the news that laser has different rate to aggrandizement of all sorts of surface of cutting tool material [5, 6] , also somebody studied laser is right directly the exterior aggrandizement of high speed cutting tool, although laser alloy is changed,had obtained decisive progress with layer of frit Fu pottery and porcelain, but in industry actual batch turns application less, be in especially respect of modified of cutting tool material. 3.

The application that at present laser aggrandizement technology makes in civil cutting tool is civil bedding face of cutting tool quantity is wide, have: Hutch knife, scissors, razor, smash the knife, at present reason of cutting tool invalidation basically is in edge, if point wears away, collapse blade, corrode etc, to achieve the goal of wear well, general workmanship method is: 1) use whole high-powered alloy material, wait like high-speed steel 2) use clad steel, if knife of compound armor plate is cut,wait 3) point sets solder hard alloy material, wait like hard alloy, pottery and porcelain, high-speed steel. Demand of raw material of before two kinds of methods is higher, production cost is higher; And because latter sets solder to often be material of material hard brittleness, bring difficulty to workmanship, the intensity setting solder that is like hard alloy and matrix, hard alloy sets solder length finite etc, service life is affected. Laser v is technology of a when the development on technology of Fu of afterwards laser frit rises new laser beam machining, draw lessons from traditional v technology advantage, heat up to add with high-power laser source, the alloy welding wire that sends to synchronism and matrix surface layer fuse quickly at the same time, get with matrix complete metallurgy is united in wedlock have special property (wear-resisting, be able to bear or endure corrode, heat-resisting) surface layer, form compound layer, use at making bimetallic cutting tool. And laser alloy is changed is alloying element is added inside the exterior melt layer of matrix, form the new alloy layer that is a foundation with base material thereby, achieve exterior modified, the end that point strong pliable but strong changes. Integrated the advantage of afore-mentioned technologies, use this one technology at aggrandizement of surface of cutting tool material to handle, it is one of important ways that improve cutting tool wearability and its service life, especially to cutting tool of pottery and porcelain, hard alloy this is planted tall hardness, hear resistance is good wait for an advantage, be helpful for raising treatment efficiency and treatment precision, can be opposite if difficult treatment material quenchs steel is in unfavorable treatment undertakes cutting is machined below the condition. Because their strength is relative inferior, tenacity and but $&* sex is poorer, limitted their applied scope severely, the research sense that because technology of aggrandizement of this laser surface applies at pottery and porcelain, hard alloy,cutting tool has profundity and wide applied perspective. Current, raise cutting tool domestic and internationally to fight tatty method main component is two kinds: One kind is groovy finishing law, if use the surface of special rule to quench the method, method of laser frit Fu (the alloyed powder of cladding is Ni, Co radical to add up to gold or the carbonization tungsten that add thick grain to perhaps use Fu of frit of laser thick layer from frit more, this kind of method is applied to quite grind bead to wear away very tall operating mode, for example, the excavate tool such as mine, oil, agriculture machinery) wait, the defect that its exist is the blemish such as easy generation crackle. Another kind is the coating cutting tool that development rises recently, the defect of this kind of method is deposit coating thinner. These two kinds of methods have his the defect of different level. Former it is to pass the microstructure change that material itself produces to raise hardness and wearability, be opposite only consequently carbolic steel is effective, and the cutting tool material to material of hard alloy, high-speed steel criterion the effect is not apparent, use latter not only coating is thinner, coating deposit time is longer, and in be being used actually, often happen flake phenomenon. Be in for technology of laser surface aggrandizement below the applied example in modified of cutting tool material. 3.

Modified of surface of Fu of frit of laser of knife of hutch of 1 family expenses uses laser coating to undertake layer in mouth of commonly used edge of stainless steel hutch fast frit Fu, get coat the cutting tool point of even, tall wear-resisting, the cutting tool that replaces a tradition manufactures technology, transform its industry to raise cutting tool (hutch knife) the immanent quality of the product and additional cost. Those who pass pair of coating data deserve to compare, the analytic research of the respect such as laser coating function, development goes with " slug knife " the hutch knife of coequal level will be used actually change. Use through optimizing craft beforehand the ply that powder of buy type alloy got coat of flawless, certain hardness, be out of shape small, temper takes narrow point. Can see, frit cladding is enclothed equably go up in edge. To section analysis, from can see cent is 4 area apparently inside extroversion: Area of frit cladding, sclerotic intermediate zone, temper and base material. 3.

1.

Area of 1 frit Fu this area is bases with coating material, hardness is taller HV990-1300, ply 0.

02-0.

08mm, among them a large number of not the horniness grain of frit, had the effect of dispersion aggrandizement. Coating heavy panel is easy form crackle, the influence is used, through optimizing craft parameter, got already flawless, hardness tall, surface is bright and clean, show the coating that good metallurgy combines with matrix, and this one coating raises point to wear away just about the key of function. 3.

1.

This one area includes 2 sclerotic intermediate zone to change a layer with the alloy with frit conterminous cladding, quench with what temper area connects area, 80% what take sclerotic layer, hardness layer hardness is gently and excessive, the organization basically is excessive refined martensite and carbide. 3.

1.

Because 3 temper area scans of speed accelerate, temper area narrow, the organization is body of all alone family name and carbide. The existence of temper area is helpful for maintaining the tenacity of point, unapt below circumstance of tall hardness concussion rupture. 3.

Infiltration of laser of cutting tool of aggrandizement of modified of rice of accept of 2 laser infiltration is craft of Fu of frit of laser of a kind of union and laser alloy the method of the exterior modified that changes technology. In applying its gardens cutting tool to produce a course, can undertake aggrandizement of laser surface modified to the cutting tool of different type. Accept rice material has better mechanical performance than micron course material, besmear Fu spends in high density at the accept rice alloyed powder of matrix surface stimulate action of beam of light to issue fast frit to coagulate, with partial offer rice infiltration of hard alloy grain arrives among base material, removed microalloy to change intention, and the cladding that cutting tool surface can obtain Na Mijing again, raised obdurability and wear-resisting not only consequently and the hardness layer that still deepened cutting tool point is deep, prolonged the service life of cutting tool. After bit is handled through laser, apparent sclerotic layer is formed in surface layer, hardness presents gradient change, core still holds former organization. Such making that surface layer is hard and wear-resisting, core ministry maintains tenacity, and locomotive process has " from acute sex " the effect, make the service life of bit is lengthened. The ply of this razor blade is 1.

5mm, sclerotic layer deepness is 0.

18mm, layer of surface layer Bai Liang is alloy carbide, martensite, hardness is HV0.

2 820-766, core is temper troostite, hardness is HV316. 4, laser aggrandizement technology is looked into in what modified of cutting tool material applies be opposite domestic and internationally at present the research of project pottery and porcelain and hard alloy material has certain progress, on the other hand laser undertakes to cutting tool exterior aggrandizement handles the forward position that belongs to current machining domain, with powerful laser bundle certain to replacing heat treatment is a kind of effective method, link the development of technology of current offer rice, their combinative place is found on the foundation of these 3 direction, consult congener and similar research technique, undertake study to the laser aggrandizement mechanism of pottery and porcelain, hard alloy and technology, after putting forward to be in, research work lieutenant general passes pair of tall wear-resisting / be able to bear or endure corrode / material of pink of horniness of heat-resisting accept rice (pottery and porcelain, composite material) development and deserve to compare, craft of v of thick layer of function of layer of aggrandizement of laser accept rice, laser and, use corresponding technology in the light of different cutting tool, use average cutting tool data to develop the new product that improves obdurability of cutting tool point, wearability and service life, acquire all sorts of pair of cutting tool kind infiltration of alloy of rice of compound, accept and product change material laser v practical the overall engineering technology that change, make its can satisfy the complex requirement of actual production, overcome brittleness of material of cutting tool of pottery and porcelain especially big, dependability is low defect, added an efficient way to improve hard alloy and data of pottery and porcelain. Believe laser alloy changes exterior aggrandizement technology to have wide applied range and wide applied perspective in modified of cutting tool material. CNC Milling CNC Machining