Wrong tine column of 3 blade milling cutter is alveolar the computation of width

Graph 1 left dextral crisscross ages fault of abbreviation of 3 blade milling cutter ages 3 blade milling cutter (milling cutter sketch map sees graph 1) . Performance of cutting of this milling cutter is good, the milling that applies extensively at face of groove, planar, cant, step is machined and cut off treatment. But because left and right sides of this cutting tool comes back to two kinds of tine are arranged in the crisscross on circumferential face, its workmanship is trival and treatment difficulty is greater, extremely easy mill drops Zun Xuan to age when mill right-hand teeth, vice versa; In the meantime, because treatment uses treatment of batch of the axis that wear core when this cutting tool, the loss when occurrence reject is bigger; Because do not have,use scientific computational method before, the experienced worker with only experienced minority or technical staff ability are competent the milling treatment of this cutting tool, treatment cost is accordingly higher. Be aimed at this problem, the article puts forward what replace the past with scientific calculation method to be machined by experience, and derivation gives corresponding computational formula and the method that use this formula and skill. The fault ages 3 blade milling cutter is making medium main difficult point is the mill treatment that column ages. Because crisscross of left, right-hand teeth is arranged on cylinder, when treatment must all mill is over Zun Xuan of mill of the ability after right-hand teeth ages, accordingly when mill right-hand teeth must the seat that obligate gives Zun Xuan age. If the position of obligate is insufficient, when Zun Xuan ages, mill does not give complete tooth form with respect to mill, bring about reject generation; If obligate position is too large, alveolar width is too narrow, the coefficient that hold bit is insufficient, hit a knife extremely easily or lower service life. Actually, the size of this position is controlled by alveolar width, and did not give out on blueprint paper normally alveolar width, because the Zun Xuan of obligate of the place when this mill right-hand teeth ages the position is controlled harder beforehand, wait for mill to be over one kind comes back backward another kind of Xiang Shicai coming back can discover mill the place is wrong, but already caused right now group by group reject (2) seeing a picture. Graph 2 graphs 3 this shows, the key that solves this problem is to use proper computational method to be calculated beforehand a milling is alveolar width, the obligate when control mill right-hand teeth from this gives Zun Xuan the reasonable seat of tine, in order to avoid the generation of reject. milling cutter edge circumferential spread out (if the graph shows 3 times) can reach the following formula: In L1=A+L+A+L+2Btga=2A+2L+2BtgaL=L1/2-A-Btga type, l1=2pD/Z criterion in L=pD/Z-A-Btga(1) type: D -- Z of milling cutter diameter -- mill tooth counts B -- A of milling cutter width -- A of width of milling cutter first flank -- L of helix angle of tine of milling cutter column -- tine of milling cutter column is alveolar width L1 -- milling cutter dextrorotation (Zun Xuan) tine photograph adjacent, what according to blueprint the design gives measure, cipher out concerns data and take L to be less than PD/Z-A-Btga a bit, those who make mill goes out is alveolar wide be equal to L, can make sure the normal milling of left right-hand teeth is machined namely, and the chamfer that hold bit is the biggest. Computational example: Take D=150, z=26, b=20, a=10 ° , a=1.

2, each value era enters type (1) criterion L=pD/Z-A-Btana=p150/26-1.

2-20tan10 ° =13.

4 basises afore-mentioned formula, when mill dextrorotation is alveolar, should make sure alveolar width is in only 13.

4 less than can need not underline immediate treatment, and the tooth form that won't destroy Zun Xuan to age. The formula that the derivation in article gives applies to cutting tool of tine of or so crisscross, if the fault ages,a milling cutter, fault ages 2 blade milling cutter, fault ages 3 blade milling cutter and milling cutter of wrong tine echelon. Treatment carries out a proof, this method is simple easy travel, accurate and reliable, practical strong, use this kind of method to machine afore-mentioned milling cutter to be able to reduce treatment difficulty, raise product percent of pass. CNC Milling