The cutting of project pottery and porcelain is machined (on)
- source:WEINBERG CNC Machining
What function and use does project pottery and porcelain have? Ceramic is seen everywhere in people life, be like all sorts of chinaware, glass, cement and fireproof material, a general designation is traditional pottery and porcelain. Traditional pottery and porcelain is the natural raw material such as clay, feldspar and quartz, via smashing one figuration one agglomeration and become agglomeration system, its bases is silicate. Compare with photograph of traditional pottery and porcelain, project pottery and porcelain is with artificial complex tall purity compound is raw material, become via delicate figuration and agglomeration. Project pottery and porcelain has the superior performance that traditional pottery and porcelain cannot compare, reason calls careful pottery and porcelain, also weigh advanced ceramics or special type pottery and porcelain. Project pottery and porcelain has a lot of kinds, main component is structural pottery and porcelain and functional pottery and porcelain two kinds big. There are high temperature pottery and porcelain and high strenth pottery and porcelain in structural pottery and porcelain, include pottery and porcelain of tall strong tool. Functional pottery and porcelain includes magnetic pottery and porcelain, interpose report pottery and porcelain, semiconductor pottery and porcelain, optical pottery and porcelain and biology pottery and porcelain to wait. Project pottery and porcelain has high compressive strength, tall hardness, tall wearability, high temperature resistant, anti-corrosive, low density and small linear expansion the superior performance such as coefficient, coefficient of thermal conductivity, apply increasingly already at the domain such as chemical industry, metallurgy, mechanical, electron, the sources of energy, spaceflight and nuclear power. Project pottery and porcelain can use production bearing, seal ring, piston, cam, cylinder bushing, jar lid, light gear of lamina of turbine burner, turbine, decelerate, be able to bear or endure corrode pump. Its apply a domain to expanding ceaselessly, like be the same as metallic stuff, composite material, project pottery and porcelain is becoming one of 3 big important pillar of material of modern project construction. Normal MARGIN of pottery and porcelain of 28pt" Align=center> project: 0cm 0cm 0pt; TEXT-INDENT: 24.
1pt; LINE-HEIGHT: 28pt">2.
What cutting does project pottery and porcelain have to machine a characteristic? Normal > to material of pottery and porcelain, traditional treatment method is to use diamond to grind round of grinding, still have abrade with polishing. As the occurrence of agglomeration diamond cutting tool and the development that cut pottery and porcelain easily, the cutting treatment of material of pottery and porcelain received increasingly wide application. The cutting treatment of project pottery and porcelain has the following characteristic: Normal >(1) pottery and porcelain has very tall hardness, for instance the hardness of Al2O3 pottery and porcelain, TiC pottery and porcelain can amount to HV2 250 ～ 3000, even taller than hard alloy, be next to diamond and cubic nitrogen to change boron. Project pottery and porcelain has very tall wearability, besides cut pottery and porcelain easily, the cutting of average project pottery and porcelain, exceed material of strong cutting tool only (diamond and cubic nitrogen change boron) ability is competent. Normal > natural single crystal is sharp, hardness is tall, wearability is 10 times of Al2O3 pottery and porcelain, the heat when cutting wears away very small. But natural diamond has cleavage sex, encounter concussion or oscillatory easy damaged, durability is not tall and the price is high. Accordingly, use agglomeration diamond commonly (get together brilliant diamond) make cutting tool material, agglomeration falls in high temperature high pressure by particle of making synthetic diamond and it is become, hardness a bit under diamond. Normal >(2) pottery and porcelain is typical hard fragile data, its purify mechanism (12-1) seeing a picture is the brittleness of generation of the material that be cut near cutting tool point is destroyed, is not to resemble metallic stuff arising in that way cut slippage to be out of shape. The surface after treatment won't have be out of shape by plasticity the treatment that cause deteriorates layer, but meeting remain is machining the brittleness chap when cutting apparently, affect the intensity of spare parts of pottery and porcelain and working reliability thereby. Normal >(3) pottery and porcelain, those who depend on its sort, production method is different have very big difference. Look from the angle of machining, the stuff of pottery and porcelain with low fracture toughness is machined easily by cutting. The fracture toughness of material of pottery and porcelain and structural composition and agglomeration circumstance are concerned, firing temperature and pressure are higher, material is more compact, hardness is taller, cutting processability is poorer, cutting tool durability is lower. Normal >(4) pottery and porcelain does not have plasticity almost below material normal temperature. Certain pottery and porcelain just is met in high temperature area only bate shows plasticity, generation cuts slippage to be out of shape. Right now material of cutting pottery and porcelain also is the same as cutting metal same, can get successive form cuts bits. The lens face treatment of SiO2 glass has this kind of characteristic. Normal >(5) cutting pottery and porcelain is gotten greatly when stuff of more general than cutting metal much, it is difficult that cutting tool is cut. Should notice to prevent cutting tool damaged, cutting deepness and feed should somes small. Normal >(6) cutting pottery and porcelain, cutting tool wears away serious. Can increase radius of circular arc of point of a knife appropriately, increase point of a knife intensity and medicinal powder hot sex. The choice of cutting dosage also affects cutting tool to wear away. Deepness of tall, cutting mixes cutting speed feed is cosmopolitan increase cutting tool to wear away. Normal MARGIN of pottery and porcelain of 30pt" Align=center> project: 0cm 0cm 0pt; TEXT-INDENT: 24.
1pt; LINE-HEIGHT: 30pt">3.
How to undertake cutting to Al2O3 pottery and porcelain? Normal >Al2O3 pottery and porcelain is 3.
83g/cm³ , compressive strength is 2800MPa, bending strength is 300 MPa, hardness is HV2100 ～ 2200, although be when 1200 ℃ , hardness still can maintain in HV1500. Normal > cutting Al2O3 can choose agglomeration diamond cutting tool, razor blade of φ 13mm circle, γ O=-15º ～ - 10º . Point grinds wear γ Ol=-30º , b γ =0.
Of 05mm lose edge, in order to raise cutting tool durability. Normal > must consider to be affected to cutting tool tatty when choosing cutting dosage. Cutting rate is high, cutting deepness and feed are cosmopolitan make cutting tool wears away VB value is increased. Accordingly, cutting Al2O3 pottery and porcelain is unfavorable choose very tall cutting dosage. 80m/min of ～ of general ν C=30, ap=1 ～ 2mm, f=0.
05 ～ 0.
12mm/r. When cutting pouring emulsion, make with because cutting temperature is high,avoiding diamond molten, the cutting function of diamond particle is reduced because of thermochemistry action. Normal MARGIN of pottery and porcelain of 30pt" Align=center> project: 0cm 0cm 0pt; TEXT-INDENT: 24.
1pt; LINE-HEIGHT: 30pt">4.
How to undertake cutting to Si3N4 pottery and porcelain? Normal >si3N4 pottery and porcelain is not as tall as Al2O3 pottery and porcelain, but high temperature hardness is good, the hardness when 900 ℃ is a few kinds of pottery and porcelain in highest. Its compressive strength, bending strength also pottery and porcelain of prep above Al2O3. 2 what the coefficient of thermal conductivity of Si3N4 pottery and porcelain is Al2O3 pottery and porcelain about.
5 ～ 3 times, it is the processes the hardest data in all pottery and porcelain. If turning HV1600, bending strength is the Si3N4 pottery and porcelain of 950MPa, when ν C=10m/min, cutting is less than 10min, of diamond cutting tool wear away to already exceeded 0.
1mm, cutting blade appears flake wear away. The high temperature hardness of Si3N4 pottery and porcelain is very tall, HV1100 still maintains when 1000 ℃ . Radial component of force is very large when cutting, edge appears not quite easily because of intensity tiny collapse blade, treatment surface appears scraggly, the value increases exterior surface roughness. Normal > cutting Si3N4 can choose agglomeration diamond cutting tool or CBN cutting tool. Should special attention strengthens cutting blade, take γ O=-15º . , point must abrade, in order to raise cutting tool durability. Use CBN cutting tool can choose taller cutting career. Use inferior cutting rate (when pottery and porcelain of Si3N4 of 50m/min) cutting of ν C ＜ , can not add emulsion. Low speed is wet when cutting, temperature is elevatory not much, intensity of pottery and porcelain is reduced without what, the material be cuttinged near cutting tool point destroys dimensions to increase, action also is increased in the bear on cutting tool, make diamond grain damaged, fall off, because this should use lesser feed, general F ＜ 0.
1mm/r. Normal >5.
How to undertake cutting to ZrO2 pottery and porcelain? Normal >ZrO2 pottery and porcelain is HV1 853, the hardness that compares pottery and porcelain of Al2O3, Si3N4 is low, the cutting tool when cutting wears away small. Below same cutting condition, the value wears away to have the 1/2 of cutting Al2O3 pottery and porcelain only at the back of the cutting tool when cutting ZrO2 pottery and porcelain, it is the 1/10 of cutting Si3N4 pottery and porcelain. For example, when ν C=20 M/min, after 50 Min of cutting ZrO2 pottery and porcelain, the ≈ that be worth VB wears away from the back 0.
04 Mm, still can continue to use. And cutting Si3N4 pottery and porcelain only 5min, value VB wears away to be amounted to from the back 0.
12mm, and have generation of tiny collapse blade. Visible, the cutting processability of ZrO2 pottery and porcelain is better than Al2O3 and Si3N4. Higher cutting rate can be chosen when cutting. 100 M/min of ～ of C=50 of the ν when turning, when milling desirable ν C=200 ～ 400m/min. Answer when cutting pouring cutting fluid. Normal >6.
How to cut pottery and porcelain easily to profile to undertake cutting? Normal >AlN fastens profile to cut pottery and porcelain easily is improve on foundation of micaceous department pottery and porcelain get, it offers money with the profile after agglomeration, user reentry machines figuration all right. Because this kind of pottery and porcelain joined imperceptible BN particle in AlN matrix and into even and dispersive structure, improving Yuan Yun's mother greatly is strength of data of pottery and porcelain the weakness with low, little coefficient of thermal conductivity. Its bending strength is a bit some lower than Al2O3 pottery and porcelain, can grind make the sheet with a 25 μ large M. Normal >AlN pottery and porcelain is good, it is the coefficient of thermal conductivity in material of existing pottery and porcelain is the biggest, for 5 times of Al2O3 pottery and porcelain, need not cool also but normal cutting. The linear expansion coefficient of AlN pottery and porcelain is low, dimension precision is controlled more easily. AlN pottery and porcelain is called " the 2nd generation cuts pottery and porcelain easily " , its cutting mechanism also belongs to brittleness to destroy. When cutting, the material that be cut produces crackle in point of cutting tool point, but dispersive BN particle prevents crackle to expand, make its confine forms very subtle crackle within small area, make brittleness is improved greatly, and attainable consecutive record cuts bits. Normal > cutting AlN can use hard alloy cutting tool, cutting speed should compare cutting metal data some lower. Appropriate of the whorl inside turning small diameter uses the agglomeration diamond cutting tool with good wearability. When milling, because be interrupted cutting, should reduce feed, in order to reduce collapse blade. Machine the surface cut bits to should keep clear of in time, meet otherwise aggravate cutting tool wears away. CNC Milling