The design of aperture treatment cutting tool is one needs to have the complex process that coordinates each other to a lot of technology difficult problem. Seco Carboloy company (be located in the United States to rest closely root city Warren) auger cut product manager Goran Melin to say, "The technical difficult problem that often is some respect gets settlement, inevitable meeting on the other hand produces new issue. " all many sided with these harmonious need, include precision of cutting tool life, treatment and stability to wait normally. Need of personnel of cutting tool design is ceaselessly in these variable find out first-rate solution. From Seco Carboloy company the PerfoMax machine of newest production places the design process of product of type broach series, the recognition that can see above is correct. Through undertaking be harmonied each other to a lot of technology difficult problem, the new-style chance that the design gives adds type bit, expanded greatly applied limits. The problem is such: In the choice that is in a lot of at aperture using that machine cutting tool, broach of machine clip type is the solution of low cost normally. Introduce according to Mr Melin, the razor blade of broach of machine clip type has 4 cutting blade, normally broach cutter hub has change the service life of 40-50 second razor blade (this depends on workpiece material) . Accordingly, mix with integral type solder type broach and the broach look that can exchange knife head are compared, machine clip broach the cost of every cutting blade is apparent lower. However, usually, the need when use machine places type broach bore has a wider treatment common difference, mr Melin says. Because this kind of broach has the cutting blade of asymmetry actually. Broach of machine clip type uses two bit, a razor blade crosses a center, another razor blade from inside outspread piece to whole diameter. Generation cutting force is inhomogenous because only feed fights force,be and the cutting speed on central razor blade is 0, and outside because rate is higher,excise material thereby along bit more effective. Its are broach produces cutter hub in entry point as a result deflective. "Before broach enters whole cutting, you must know this kind of not stable position, " Mr Melin says. "Broach is longer, deflective amount is larger. " so to longer broach, in Kong Jia project entry is in (make an appointment with 1mm) , answer to reduce feed rate to the 30-50% that recommends a value. When entering overall cutting, with recommend value treatment. But this one proposal is undesirable, because jockey is willing to use the standard cutting dosage that process designing software offers more, and cannot be the feed with special certain, and need not the feed that manual and new process designing will come to obtain the entrance to be in. Still have, when need long broach is used at the case of a few treatment only, jockey perhaps is willing to use versatility to grow bit and do not use short bit well. But such doing will reduce precision and productivity. Pass an analysis to compare, twist drill and broach of integral hard alloy, all have two cutting blade, the evenly depart in can be being machined cuts bits, make cut bits eliminates easily and raise broach cutting rate. And broach of machine clip type has blade of a cutting only, predestined relationship razor blade excises major metal outside. This raises those who limitted the effective eduction that cuts bits and feed rate. But it won't produce very great attrition power, because it does not have the wider first flank with twist drill peculiar head. Can be in so higher rotate speed (Rpm) next treatment. But regretful is, in use machine length of the broach that place type exceeds 4 times diameter, when choosing big feed cutting especially, of broach be out of shape the technical difficult problem that becomes need to basically be solved. Because of these reasons, broach of machine clip type is used at reaming and requirement of dimension public errand to be in more 0. 008 inches semifinishing machining circumstance. Say so, use machine places type broach to be able to achieve the economy of expectation, but the precision that always can not obtain need. Limit a factor to overcome above, engineer of Seco Carboloy company is designing new-style machine to place type bit in, emphasize undertook the following the improvement of 5 respects works: 1.
They are in of broach outside the predestined relationship withholds what more metallic stuff arise with counteractive cutting force to bend be out of shape. 2.
The razor blade that they optimize clip to hold square razor blade, because of the horn of point of a knife of 90 ° , its intensity is original good. 3.
Broach design has two cooling fluid to connect what have enough space with two into aperture to take the tilting chamfer that discharge bits a bit. Drop in temperature enoughly in order to make broach cutting area gets to cool and discharge bits effectively, still have reduce the tumor that accumulate bits, lengthen broach service life and consistent exterior surface roughness. 4.
Broach surface design has tall wear-resisting coat, in order to prevent will drossy stick receive mix in cutter hub surface prolong broach service life. 5.
Current bit material qualitative order and degree is will tall hardness, fine grain matrix and film organic union rises, allow to use higher cutting rate. Mr Melin says, the broach of machine clip type of this kind of new design makes the user is in a lot of treatment (include to be able to be opposite deep aperture spare parts, be machined on poorer clamping apparatus and be opposite in tigidity treatment of Bao Bi spare parts) in those who obtain productivity is remarkable rise. Through rising stability is mixed improve a bit, raise the treatment precision of aperture. The virtue of low finished cost with inherent before together with, consequently very favour of benefit from door. The diametical limits that at present new-style machine places the norms that type broach produces to have 15-59mm, auger cut deepness to be 2-5 times diameter. Offer a variety of petiole type, include those who apply to lathe application to two cut planar general petiole type to wait. CNC Milling
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