People says to machine hardness to exceed 56HRC, or the steely material that intensity exceeds Rm>2000N/mm2 is machined for hard cutting. Below most circumstance, patternmaking or forging die is after prior operation, want to pass cementite or quench. After prior operation, must the finish machining surplus with certain obligate. Machine especially contain spherical or when the workpiece of annulus face figure, hard milling more it is important to show. Hard milling but cutting hardness comes the material of 70HRC, asks exterior surface roughness has have the aid of to be achieved at manual polish ability only normally, this is a very costly treatment process. The time that to shorten manual polish place needs, the where a thing can be put to best use that has affirmatory geometry figure must be used when milling. If be in HSC treatment, make the surface receives the surface roughness that is bordering on polishing surface: Most greatly the exterior quality of Rz1. The general hard metal milling cutter on the market does not suit to be inside this limits cutting. Solve the milling problem of hard data, must satisfy a few precondition. For example, use make by base material of special type hard alloy, the milling cutter that has distinctive geometrical appearance and corresponding coat. This means cutting tool to must have these 3 main essential factor. In the production process of cutting tool, must special attention the balance between these element. Use HSC to machine the workpiece that just exceeds 56HRC to hardness likely to undertake cutting normally. To this, its restrict the integrated action that the condition is cutting speed and temperature. To HSC, the melting point of workpiece material must check below appropriate cutting rate. Normally of the coating of melting point prep above of workpiece material highest permission temperature, so must scrupulous. Here best epigrammatic be " maintain cutting tool to cool " . This is meant on one hand the osculatory area with workpiece must as far as possible small, must complete cutting treatment in firm rate on the other hand, make cutting blade has not enough time to give out heat the temperature that exceeds coating place to allow. Detect correctly rotate speed especially important. For this, must be a foundation with actual and effective cutting tool diameter. In transverse feed Ap=0. Below the circumstance of 1mm, the diameter is the ball head milling cutter of 6mm, actual and effective diameter is 1.
54mm. To make cutting speed achieves 200m/min, rotate speed is indispensible achieve 41000r/min. Add what man-hour arises to cut bits and the quantity of heat that contain along with the place that cut bits to must eliminate as soon as possible. First-rate method is to pass main shaft to be blown to cutting blade directly compress air. Differ according to workpiece material, compress air but carry secretly a few lube. Use a few lube to be able to machine a better exterior quality, because cut bits won't conglutinate is on cutting blade. To hard cutting treatment, cannot use emulsion absolutely. Just a water causes temperature mutation possibly, can make cutting tool is decomposed for single component. As a result of the tiny flaw of the hard alloy that temperature mutation causes, will bring about cutting blade craze. In HSC treatment circumstance falls, according to cutting tool diameter and rotate speed different, these fragments may have the energy that is equivalent to the bullet that fires from inside small arms. The HSC milling that develops for black lead cutting the earliest, mean high rotate speed and big feed not only, and fall in the joint action of numerous element, its apply limits to expand ceaselessly. The power of hard milling decides the machine tool that uses at place greatly. Altogether, the concept of hard cutting is contacted together with high speed machining. CNC Milling