What bit is better for drilling 304 stainless steel?
Drilling 304 stainless steel with an ordinary high-speed steel drill can be done, but note the requirementThe sharpening angle of the drill must not be less than 110 degreesThe angle of the drill should be symmetricalDon't be too sharp edge cutting is not easy.
Alloy bit generally refers to the hard alloy bit, divided into integral, welded, indexable inserts and removable head. Generally the whole tungsten alloy drill bit materials, imported and domestic alloy bit is very different. Imported alloy bit usually adopts VHM micro grain hard alloy (ISO K40), the type of ultrafine particles (0.6 m), will take the high-quality alloy bit surface coating, such as chromium aluminum nitride (AlCrN) coating, the coating layer of coating, the thickness of 4 m, the micro hardness is up to 3200HV, the friction coefficient of 0.35 the thermal stability, up to 1100 degrees celsius. After coating, the drill color is bluish gray. After coating, the alloy drill can process low alloy steel and high strength steel. High steel can reach 54HRC.
Cobalt cobalt high speed steel processing of stainless steel drill bit: high cobalt drill (M35 drill, M42 bit).. where M42 bit is best performance
Recommend two bit, a cobalt high speed steel drill, a kind of high performance cemented carbide drill bit, cobalt high speed steel prices, but the short life, low efficiency, poor accuracy, need to pre order centering drill better; hard alloy drill special stainless steel price expensive, but also life a lot of high efficiency, high precision of hole size, also, finish too high a lot, without centering drilling machining, can be directly used cobalt alloy drill drilling; compare the two contrast, characteristics of stainless steel is high toughness, easy to stick a knife. So the drill head hardness is high, the main component is hard alloy tungsten carbide, cobalt, hardness is generally high in HRC90 degrees, cutting fluid with emulsion concentration. The cutting speed is as low as possible, because the 304 stainless steel easy drilling so as to reduce the temperature for heating chip.
