Stainless steel regards a kind of metal as material, want to try to apply to its, must make through different treatment kind its make satisfactory product. Often meet in grinding treatment " jam " problem, the article offers a solution to this. Because the 15% or so metropolis of the metallic equipment gross that stainless steel is delimited the categorical whole world of difficult treatment material is produced every year is different of the reason corrode and oxidize and suffer a loss. Of gross of loss of this metalloid parts of an apparatus 30% belong to " permanent " loss, namely " cannot reclaim quality " loss. Build to devoting oneself to " low carbon economy " and " green economy " human society, how to prevent, reducing this kinds of loss is a grim challenge. Stainless steel has other steel to plant what place does not have is admirable fight corrode, fight oxidation function, accordingly, in report of in suspension of car, train, light course, subway, Gao Tie, magnetism, shipping, aviation, spaceflight, oil, water and electricity, wind, nuclear energy, electric, electron, information, building, environmental protection, medicine, food, chemical industry, papermaking, marine project, war industry, stainless steel material gets applied widely. Stainless steel industry of China, no matter be,producing still can be crop, occupy world first position high all the time since 2006. Current, on company of products of domestic stainless steel 10 thousand. Be in a few areas, if Guangdong saves in relief river,still formed annual produce the hundreds of stainless steel goods of 100 million produce base. 2010, crop of Chinese stainless steel forces continuously 9 million tons, occupy the 1/3 of crop of global stainless steel. Year smelt ability amounts to 15 million tons, exceed an European Union the summation of the summation of all countries or United States, Japan. Of quantity of total demand of domestic stainless steel 60% self-sufficient. Stainless steel is to point to have very tall corrosion resistance can metallic stuff, general component is martensite kind stainless steel, ferrite kind stainless steel, austenite kind stainless steel, austenite + ferrite kind stainless steel. Among them with austenite kind stainless steel, austenite + ferrite kind stainless steel is machined the hardest. Regard a kind of metal as material, want to try to apply to its, must make through different treatment kind its make different product. Stainless steel spare parts asks to achieve exterior character and treatment precision, use grinding to machine a method normally. As a result of stainless steel tenacity small, stretch model measures big, coefficient of thermal conductivity small, reason machines middling to put in following problems in grinding: Emery wheel easy conglutinate jams; Machine exterior easy burn; Treatment sclerosis phenomenon is serious; Workpiece is changeful form. See not hard, the choice of emery wheel and grinding fluid affects grinding efficiency and treatment precision directly. Current, what industry of products of domestic stainless steel uses generally in grinding treatment still is pottery and porcelain alumina series grinds bond to provide and besmear add grind. Meet constantly in treatment of stainless steel grinding " jam " the worry of the problem, affect the treatment efficiency of stainless steel goods and result. Accordingly, people delimits stainless steel " difficult treatment material " category. The sort of stainless steel and the characteristic that its grinding machines add different element to organize what affect stainless steel directly form, if ferrite forms an element: Cr, Mo, Si, Ti, Nb; Austenite forms an element: C, N, Ni, Mn, Cu. Among them Cr element is opposite in the content in stainless steel the sex fighting corrode of stainless steel and oxidisability have crucial effect. Current, the should hold stainless steel total output 60% above of element of Cr, Ni are joined at the same time in stainless steel. On the classification of metallic stuff, people of characteristic of metallographic of constant according to differ to be stainless steel cent 5 kinds, namely: · martensite stainless steel · ferrite stainless steel · austenite stainless steel · austenite -- ferrite answer photograph stainless steel stainless steel of · precipitation sclerosis among them the commonnest should count austenite stainless steel, 70% what should occupy stainless steel gross about. Compare with structural steel photograph, poor, stretch model measures stainless steel thermal conductivity low, percentage elongation is big, and section shrinkage is big also, to treatment especially grinding treatment brings many difficulty. Its grinding machines showing a characteristic is extremely easy produce grinding conglutinate, jam grind, affect grinding efficiency and grinding quality, cause even stainless steel is machined and grind those who provide " internecine " . The tradition grinds those who provide pair of stainless steel treatment to jam generation mechanism up to now, people is ground to what stainless steel grinding uses providing still basically is series of alumina of bond of pottery and porcelain is ground (the article does not discuss besmear to add grind) . It is Bai Gangyu more among them, also have those who use single crystal corundum or microcrystalline corundum, still have what minority uses carborundum or King Kong stone mill provides. Often can produce the problem that grinding jams in grinding process. Bring about grind an element that jam not onefold, article side overweight heats up the angle of action to try to discuss from grinding. Well-known, grinding of meeting translate into heats up the majority of grinding power, it basically is used up at heating by grinding workpiece (it is stainless steel here) , grind provide and worry bit, still one part carries heat radiation kind to grind dissipation of space of treatment spot periphery. Consider domestic and internationally to all confirm, the local district of grinding workpiece surface and job grind the temperature of instant of most advanced part of bead to be able to get on 1000 degrees, and stainless steel begins bate namely when 700 ℃ . Pottery and porcelain is the stuff with low thermal conductance, the thermal conductivity of stainless steel is very poor also. Al2O3 and SiC are the stuff with low thermal conductance likewise (see a table 1) . Express a few kinds of 1 metalloid material to be in room temperature (20 ℃ ) the thermal conductance below can foreknow, grinding with series of alumina of bond of pottery and porcelain provide or when SiC grinds a grinding stainless steel, the saving influence with its hot grinding will be greatly strong at processing common structure steel when. The Al2O3 that high speed moves or SiC wear bead " hard particle " , already became below high temperature bate, " sticky " stainless steel surface " hang brush " , drossy wrap up stays in stainless steel the face that wears a surface layer to wear bead, make grind the acuteness of bead to small blade decreases or lose small cutting action, increase the attrition that wears a surface and stainless steel face thereby, grinding obstruction jumps, calorific more serious, conglutinate, fusion welding, jam (conglutinate, built-in model compound jam) generation. Grind provided grinding efficiency and effect to drop quickly consequently, can appear even workpiece and grind all by the result of burn. To reduce the negative effect that jam, force handlers to often stop machine provide to grinding undertake nap. Stainless steel application is wide, the graph is stainless steel table. What provide as to King Kong stone mill is sticky, because have more in stainless steel,blocking up basically is with diamond crystal lattice correspondence spends tall elemental part, below high temperature, they will diamond " change instead " for black lead. In addition, hard and clinking diamond is in extremely easily also " soft " stainless steel surface leaves deep cut nick. Of course, treatment of grinding of active stainless steel is being ground no matter, the goodish earnestly of the respect needs dosage of grinder, cooling fluid, grinding improve, but investigator and generator are aimed at actual condition, via fumbling for a long time, still obtained a few conduce to more reasonable use tradition grinding a parameter that machines to grinding of stainless steel material, we list these parameter below, offer intended person referenced: Grinding hardness: Granuality of abrasive of J, K: 40/50, 50/60, 60/80 grinds a rotate speed: N ≧ 50m/s grinds deep: Kibble Ap=0. Essence of 02mm grinds Ap=0.
005mmCBN grinds the nitrogen of ideal tool cubic metre that providing is material of grinding stainless steel to change boron (CBN) it is the material with foregone nonexistent nature, it is good inorganic metalloid stuff. Its hardness is next to diamond (see a table 2) ; Chemical laziness is very tall, do not kiss with Fe, C and; Heat conduction rate is high also; See rational excel diamond, because of this grinding Shi Zirui sex is better. It the hardness that expresses a few kinds of 2 abrasive is compared is very a bit more important that the hardness that expresses a few kinds of 2 abrasives is compared be, because CBN abrasive is hard, small blade is extremely sharp, the attrition obstruction that wears face of a surface and stainless steel is reduced greatly, the generation with hot grinding also decreases accordingly. Rate of heat conduction of together with CBN is high, chemical laziness is tall, very be helpful for reducing grinding conglutinate, fusion welding and the happening that jam, can maintain for long grind those who provide is sharp spend and machine quality goodly, reduce sheet finished cost, be helpful for an enterprise increasing benefit. Be worth to be popularized energetically use. CNC Milling
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