Russian
Selection of abrasive wheels
Abrasive
White fused alumina has a better cutting performance and self-sharpening, suitable for grinding martensite and martensite ferritic stainless steel; toughness and hardness of single crystal corundum white corundum, suitable for grinding austenitic austenitic + ferritic stainless steel; microcrystalline corundum self sharpening, easy to get sharp micro edge, high strength, good toughness, suitable for grinding stainless steel, can reduce galling, burns and reduce the grinding surface roughness value. Grinding stainless steel bore grinding wheel diameter, each grain participate cutting times, easily blunt, microcrystalline corundum or monocrystalline corundum better. Selection of zirconium corundum grinding wheel effect is also very good, not only the grinding efficiency is high, and the workpiece is also not easy to burn. Off stainless steel grinding Albright, in order to solve the serious adhesion problems of the grinding wheel, also brittle and sharp silicon carbide grinding wheel or synthetic diamond grinding wheel can be used to improve the efficiency of grinding. Cubic boron nitride (CBN) wheel when grinding hardness greater than 275HBW martensitic stainless steel should be used.
Granularity
The size of the abrasive particle size, surface roughness of stainless steel processing has a direct impact. Usually fine grained grinding wheel, enables after the grinding surface roughness value is smaller. But because of the toughness of stainless steel, the use of fine-grained grinding wheel, abrasive dust easily adhere to blockage of the flap wheel lose cutting ability, and easy to make the surface of the workpiece nap, and thus should be used in the coarse-grained grinding wheel. The influence of particle size on the degree of adhesion of the wear debris are shown in Table 01. Can be seen from Table 01, all the more fine grit size, the more serious adhesion phenomena. Practice has proved that the grinding of stainless steel, generally to the medium grain size number (# 36, # 46, # 60) of the wheel is appropriate. The kibbled use 36 # 46 # 60 # fine grinding. Sometimes in order to be used for both coarse and fine grinding, the grinding wheel 46 # or 60 # granularity. Inner circle and face grinding wheel and workpiece contact arc, should use the coarse granularity of the grinding wheel.
In order to fully display the diamond effect, to the idea of ??increasing the binder holding force on the diamond and progress of the grinding wheel bond strength. Monolayer temperature brazing superabrasive wheel can overcome the shortcomings of electroplated grinding wheel, can be achieved diamond, binding agents, chemical metallurgical bonding between the metal base body of the three having a high bonding strength, only the thickness of the bonding layer is to maintain the height of 20% of the abrasive firmly hold on to 30% will be able to load high-speed and efficient grinding abrasive grinding wheel abrasive bare brazing height of up to 70% to 80%, thus increasing the chip space, difficult to plug the grinding wheel, abrasive more fully take advantage of .
Electroplated grinding wheel the same processing premise, single-layer high temperature brazing grinding force of cutting wheel, power loss, cooler grinding means to achieve higher speed, ultra-high-speed grinding over this 300 ~ 500m / s has a special significance. Single-layer high temperature brazing coated diamond grinding wheel plus Cr silver based solder monolayer brazed wheel using high-frequency induction brazing method, added CrAg-Cu alloy as solder, 780 ° C in air the brazing 35s, natural cooling, can be securely connected between diamond and steel substrate. Found by X-ray spectroscopy and X-ray diffraction analysis, Cr3C2, Cr and diamond is formed between (FexCry) C, and is formed between the steel substrate with a brazing material without Cr comparative experiment confirmed that this alloy layer and the diamond and steel have higher bonding strength between the main factors in the base body, and grinding experiment proved by diamond indeed high gripping strength.
The low temperature of the brazing process strengths, small diamond injury. Drawback silver-based brazing material with lower melting point, wear poor cutting High Functional efficient Grinding application restrictions.
Ni-Cr alloy monolayer brazing wheel Global diamond brazing process: First the oxyacetylene torch base steel body on the flame-sprayed layer of Ni-Cr alloy layer, this layer of the active metal can be used as solder directly brazed diamond abrasive grains, 1080 ° C argon, then induction brazing 30s.