Composite material is by two kinds different material is united in wedlock together, form a kind of new material, character exceeds originally two kinds of base material. Take the place of early when ancient Egypt, the mankind is formed with mud and wheat stalk union the earliest " composite material " , intensity exceeds mud and wheat stalk itself. Contemporary and common composite material differs according to base material cent is plastic base composite material (the article is restricted to discuss only plastic base composite material) , metallic radical composite material, radical of pottery and porcelain the; such as composite material is plastic base composite material enters matrix according to mix again kind different material, cent is carbon fiber, fibre glass (common calls glass reinforced plastics) , the material such as fragrant black silk ribbon. Have a variety of different material overlay more, be like carbon fiber + aluminium alloy, carbon fiber + beehive material, fibre glass + the material such as titanium alloy. Composite material can design a requirement according to intensity, design different fiber to weave way, choose only way to increase data strength, cent is knitted to make the same score, twill is knitted, satin weave is knitted wait for methods of all sorts of fiber laid direction. In the meantime, plastic base composite material, can be according to matrix cent again thermoplastic composite material and hot solid sex composite material; is thermoplastic material can issue liquid of melt into of be in harmony in high temperature, and be in under melt solid turns into after temperature. This process can be repeated ceaselessly, similar small square ice cube. Character of material of hot solid sex is different. Enough quantity of heat can produce chemical reaction, call " cross-linking " , material can be out of shape forever. Hot solid is namely, follow heat and originally. After cross-linking, hot firm material won't melt. Cross high temperature, hot firm material can scorch, physical character can be reduced. Composite material and metallic photograph are compared, have the following characteristic: · reduces weight; · to reduce component amount, more high strenth and rigid; · are better impact resistance, better fatigue resistance, better heat insolation and sound insulation sex, better vibration isolation and noise attenuation sex, without electric current caustic; · controls fiber direction, · of; of different way character produces certain material complex form product. As a result of composite material by two plant or a variety of material mix are together, and fibrous laid direction, statified and different, posed taller challenge to treatment so, produce the following problem easily in machining a process: Cutting tool wears away quickly, burr is too big, material is statified, odd fiber was not excised, machine the problem such as overheat. What composite material treatment and metallic treatment mechanism are having essence is different, when the metal is machined, be compared by treatment material cutting cutting tool is softer, be machined in cutting process material along cut a face to form successive model deformation body, form thereby successive, dentate spiccato cuts bits to be out of shape. And composite material treatment, itself destroys a process for a series of brittleness, of cutting blade bump make hard fiber smashs, form pulverous state or what wool brushs shape is drossy. As a result of the tall wearability of composite material, cutting tool uses diamond coating normally or PCD(gets together brilliant diamond) cutting tool cutting. In the meantime, in process of composite material treatment, need sharp cutting blade, fiber excision. Diamond coating can be shown improve cutting tool life, but diamond coating needs point processing before coating, convenient coating is adherent, at the same time diamond coating itself has certain ply, can cause diamond coating cutting tool so relatively not sharp, normally point round part is 20um about. Direct blade grinds PCD cutting tool and become point, can compare so sharp, normally point round part is 10um about. Cut, cut bits to flow to smash through cutting face, cutting blade makes broken cutting area has matrix to come loose goodly to cut an area eagerly medicinal powder heat is less the choice of two kinds of cutting tools is decided normally according to client scale of production, if be small lot, much breed product is machined, if be large quantities of quantities finalize the design,can use; of diamond coating cutting tool product, pursuit efficiency, can use PCD cutting tool. Process composite material of common carbon fiber, linear velocity of milling of diamond coating cutting tool is 200-400m/min about, and linear velocity of milling of PCD cutting tool can achieve 400-800m/min. Composite material applies extensively at aerospace, the sources of energy () of wind report lamina, car, athletic equipment, medical treatment, the industry such as houseboat, main purpose is the high strenth of material and low density. Be like common carbon fiber, intensity is close to high strenth steel, and density is 2. 4g/cm3, density of material of fragrant black silk ribbon of lower than aluminium alloy density; is lower to 1.
3-1.
4g/cm3. Hill tall cutting tool offers milling cutter of complete treatment composite material and bit, cent is two series, diamond coating and PCD milling cutter, push for standard product entirely to the market. Workpoint of diamond coating milling cutter is 5 kinds: ■ milling cutter of small helix angle: Reduce axial cutting force, reduce burr, can apply at all and plastic base composite material, OK and very good treatment contains; of silicon aluminium alloy high ■ milling cutter of head of small helix corner kick: Basically use at machining material figuration, if aviation landing gear face machines; ■ milling cutter of left dextrorotation coming back: Handle material as to helix angle across, the axial cutting force in process of completely quits treatment, realize best treatment surface quality thereby, basically use at; of war industry industry ■ pineapple milling cutter: Use more left tooth coming back, will press below material, offer tool tigidity, acquire better appearance quality, basically use at machining; of carbon fiber composite material ■ beehive material is special milling cutter: Dentate cutting blade is designed, sharp point, light excision, prevent crushing a honeycomb-like thing, basically use at treatment, paper beehive board, aluminous beehive board with titanium alloy beehive board. Cent of NextpagePCD milling cutter is 3 kinds: · milling cutter of PCD of dip of 0 degrees of blade: All sorts of composite material that apply to absolutely big much little application (include plastic base composite material, composite material mixes metallic radical radical of pottery and porcelain composite material) ; · milling cutter of PCD of dip of 3 degrees of blade: Treatment is pressed below material of process lieutenant general, get · of; of exterior face quality loses milling cutter of PCD of dip of 3 degrees of blade going up best thereby: Treatment is pushed on material of process lieutenant general, get going up best thereby exterior face quality. Cent of diamond coating broach is 2 kinds: · C1 gets pointed design: By two apical horn is formed, reduce axial cutting force, prevent statified, with the material; · that is composite material at machining exit C2 gets pointed design: By 180 degrees of planar acme horn and bradawl needle are formed, better break bits and platoon bits design, assure the quality of aperture. Apply to treatment to export the overlay composite material that is metallic stuff, be like carbon fiber + the material such as aluminium alloy. PCD broach is the complex design that get a tip, can machine composite material to export material, also can machine metallic stuff to export material, also can realize treatment aperture of fragrant black silk ribbon, best aperture face quality. Hill tall cutting tool also can ask according to the client, special and custom-built all sorts of cutting tool that process composite material. The case of workpiece of aerospace of a few treatment is below: 1.
Client: Russia RUSAVIAINTER material: Tall cutting tool of carbon fiber hill: Milling of outline of milling cutter of dextrorotation of JC840 Zun Xuan: 8mmVc=180 M/minFz=0 of ply of Ae=5 MmAp= workpiece.
02 suitable mill, cutting is suitable slip, exterior quality is good. 2.
Airbus company (France) material: Carbon fiber machine tool: Tall cutting tool of hill of Jobs Jomach 159: X31 of standard PCD broach, diameter 6.
35 Mm linear velocity: Vc=180 M/min feed: Burr of 850 Mm/min cutting is lesser, cutting tool life achieves 60 minutes of above 3.
Client: Data of client of some aviation engine: Carbon fiber + aluminous beehive + bed of carbon fiber trigger: Gao Dao of hill of axis of Creno Liner 5 provides: JC860 beehive machines milling cutter, width of diametical 10mm cutting: Milling opens groovy cutting deepness: 40 Mm linear velocity: Speed of 160 M/min feed: 300 Mm/min is reduced ceaselessly as what composite material produces cost, crop promotes considerably, its application range is wider and wider also, the treatment challenge that brings subsequently also increases ceaselessly, we must develop cutting tool of more and new-style special composite material ceaselessly, satisfy market demand. CNC Milling
CNC Machining