Followed by the development of science and technology the network continued growth of new materials, machining is to high-quality, high-precision, high-use the passive direction network continued development, the scope of application of the ceramic diamond grinding wheel is more and more widely, the amount of network continued growth. Primary application of ceramic Gao firmly diamond grinding machining of carbide, semiconductor silicon, polycrystalline diamond compact, grinding wheel, the layout of the new engineering ceramics, precious stones, crystal, magnetic materials, high hard and brittle materials, and lost the good The application of the results.
 
Subservient good the ceramic the Gao firmly agent diamond grindstone possess high strength, heat, sharp cutting grinding effectiveness is high, the grinding process is not easy to heat and clogging, thermal amount of compression is small, shape retention is good, simple control of the machining accuracy, the same resin bonded diamond The grinding wheel contrast, he covet the low effectiveness of low grinding resin cutting wheel life, poor shape retention Abrasives I variability in the grinding process.
 
Carbide with high hardness, wear resistance, high strength, corrosion resistance and a series of excellent succumb, particularly its high hardness and wear resistance. Followed by the development of science and technology, carbide as a cutting tool material, arranged the old-fashioned high-speed steel, throughout applications such as turning, milling, planer, more scholars "to cut instead of grinding" concept, which for hard the carbide surface processing quality put forward higher requirements.

40Cr of China GB standard steel, 40Cr steel machinery manufacturing industry one of the most widely used steel. Quenched and tempered with good mechanical properties, good low-temperature impact toughness and low notch sensitivity. Steel hardenability, water quenching hardenability Ф28 ~ 60mm, the oil quenching hardenability to Ф15 ~ 40mm. This steel is suitable for cyanide and high frequency quenching treatment except quenched and tempered. Machinability better, when the hardness HB174 ~ 229 to 60%,cutting wheel, relative machinability. The steel is suitable for the production of medium-sized plastic molds.
1, the process seems to be wrong ah! The annealed hardness ≤ 207HBS 40Cr hardness after quenching and tempering is about HRC32-36, that is probably HB330-380 Why not annealed drilling, insisted to the quenched and tempered after drilling. If you really want it in the post-drilling Select carbide drill.
Reaming should choose a slow speed, feed rate slower cutting fluid oil.abrasive tools
3, a reasonable choice of the angle of twist drill geometry processing of 40C material. Best grinding group drill, countersink holes drilled.