35mm ～ 12.
The broach of 7mm, the cross is repaired grind form to have 0 only.
05mm ～ 0.
The ply getting core of 2mm, as pinpoint and same, but from centering. Choiniere of Superion company director says, to be in raised apparently bore, make the sharp drop of one each centering on broach normally, contact workpiece in order to ensure this needle is nodded at broach external diameter first, if handlers wants to be in,tilt namely of 15 ° raised apparently bore, the cutting blade banking angle of so all broach is spent must be more than 15 ° , so that make broach gets a needle to be able to contact workpiece surface first, otherwise, handlers must the cutting tool that have the aid of has smoother Duan Ren (if establish milling cutter) first mill, be in commonly on the cant that is more than 6 ° when bore, application establishs milling cutter to have prior operation, deflection arises when can preventing bore or bring slant. According to Introduction Geske, the deepness that chooses broach and bore is concerned. Because this will affect the type of broach (if broach is groovy chamfer form, still be) of parabola chamfer form. When hole depth is more than 4 times diameter, recommend with broach of parabola chamfer form. Its groove is wider, allow to use rapidder cutting rate and bigger hole depth. Once cutting tool design gets a needle to enter workpiece surface, the geometrical figure that gets a tip is in minor position instantly. The element that other needs to consider comes out now with respect to protruding, function of bits resembling a platoon and tigidity. Broach needs those who have proper figure to get a tip not only, it still must maintain enough tigidity from beginning to end. Raised surface bore waits in columnar face, use shorter bit almost, especially those process that use head. The Tom Trost of sale department assistant manager of a CJT KOOICarb company that produces bit of integral hard alloy says, the bit of hard alloy of short length whole that this company produces, the 30% horn getting a tip that are 140 ° . TiN coating, cross builds the groovy product that grinds broach to already became this company market to go up. When designing broach, should the function discharging bits of mature broach. To getting the bit of deepness of 3 ～ 4D, strubler says, most broach manufactory broaden the groove of its broach. In last few years, these manufacturer learned to operate emery wheel adroitly, make improvement groove form. To hard alloy broach, use groove bottom parallel or be lesser core thick increment, such groove become bigger. And to high-speed steel broach, as it happens is contrary, need tigidity to hold place, core thick increment is bigger and groove becomes lesser, the space that discharge bits is little, cause the difficulty that discharge bits. Speed, feed and cooling Strubler emphasize, beginning to get fashionable, want to use slower feed. Also use a few special method or program sometimes, if main shaft rotates, feed is used " peck attack " means, or repeat feed, outside aperture is being exited later. Strubler says, this is opposite actually hard alloy broach is adverse, because become when go back broach, one part cuts bits to stay in hole bottom, and hard alloy broach is cut with high speed, tall feed again fashionable collision cuts bits, can cause broach damage. To solve this one problem, recommend auger brief feed halt is joined in cutting, next resumptive feed. About using cooling fluid issue correctly, trost says, most operation personnel is when bore, oil of direct use cutting is cooling, but the likelihood gets of the problem such as environmental protection restrict. The emulsion refrigeration effect that uses oil and water is very good. Used when cutting more lubricant, make main shaft light, reduced power demand, reduced attrition. CNC Milling