When use ball head stands milling cutter to machine, although choose appropriate linear velocity and cutting deepness to undertake machining, but still a lot of elements bring about cutting tool life to drop. In the begining bear increases cutting in cutting tool of Z axis direction to hang down drop-off, when beginning cutting, the cutting tool center with slow linear velocity begins to contact workpiece above all, machine in the begining, become groovy treatment necessarily. Of direction of the feed when groove is machined on the right side of and left have work, becoming is to drop at the same time treatment, it is ascendant treatment at the same time. Rise especially treatment, those who machine a face is the life of cutting tool, bright and clean degree of metropolis drop. Because this is mixed normally flank treatment is compared, must reduce feed to spend. The helix that use cutting tool drops in that way like picture corkscrewed yarn machines the method that contacts workpiece, although eliminated linear velocity,center of slow, cutting tool engages the issue of workpiece above all, but cannot saying is best method, that is to say, when helix cease juniors enters linear treatment, still be groovy treatment. If feed rate does not fall,be here, also be the cause that causes cutting tool loss of life. Groovy treatment bear reachs treatment greatly the surface is rough when by inside outward side is undertaken machining (the treatment of the setting) , in helix cease after (Z axis arrives at treatment position after) treatment, turn flooey into treatment necessarily. At this moment if do not lower feed rate, the life of cutting tool can shorten. Horny ministry bear increases from inside outward side adds man-hour, the horny ministry treatment of acute angle is more. Machine photograph comparing with flank right now, every turn cutting bulk can increase. To make the cutting bulk of unit time consistent, be necessary to undertake in horny ministry be quickened automatically or decelerate. The hardness of workpiece is taller, in horny ministry add decelerate extent to should be jumped over big. When too long cutting tool extends the length that quantity cutting tool extends to grow too, rigid meeting drops, the life of cutting tool can shorten. When encountering tall hardness material or difficult cutting material, this kind of phenomenon will be more apparent. Cutting tool uses the milling treatment that establishs milling cutter to undertake, undertake the cutting of foreword with plural cutting blade namely, some blade from blame cutting position, as the whirl of main shaft, workpiece of bring into contact with begins cutting. The hardness of workpiece is taller, the instantaneous impact of workpiece of contact of point of a knife is bigger, the possibility that point of a knife damages is taller. Make for this thickening of point of a knife, the cutting face of edge is made negative, reduce groovy ministry to make the root ministry of blade coarsens, this kind of cutting tool calls tall hardness not to pass with cutting tool, be not tall hardness to use the cutting tool wear and tear of milling cutter, machine the critical attrition phenomenon that shows near the diameter to Wu Zaishi border, tall hardness uses the wear and tear of milling cutter, the central ministry of front is surrounded in the size Geng that machines a diameter actually inside appear very smooth, the time that cannot machine shortens substantially. So, must consider this factor inside. Integrated for, use proper linear velocity, reduce cutting deepness, the basic principle that exhausts may rapid feed rate undertakes machining is restricted not only cutting tool of Wu Xiaozhi diameter. CNC MillingCNC Machining