Figuration milling cutter is inclined grind to the shovel calculate with emery wheel truncate

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  • source:MARSTEN CNC Machining
Graph lamina of turbine of treatment of computation of truncate of 1 emery wheel uses form of cut of axial of dentiform of 1 milling cutter claimed accuracy of foliaceous root milling cutter caustic of tall, wear-resisting and can repeat for many times use. Form of cut of axial of dentiform of this milling cutter is shown 1 times like the graph. The A2B in the graph and IJ two Duan Zhi lines are perpendicular at X axis, if use common shovel to grind a law to process cutting tool tooth form, be in these two paragraphs of sharp point to cannot form the part after side, when cutting tool is used at cutting will above all herein is ground blunt, arise namely " strap a knife " phenomenon. If use section shovel to grind a method, shovel the curve outside grinding A2B and IJ Duan Zhi first namely, again inclined wear this two Duan Zhi lines to the shovel, although can assure before blade face tooth form, but the tooth form after be being ground again will produce a change, influence spare parts machines precision. If use whole inclined grind a way to the shovel, criterion the dimension of HG straight line segment is controlled hard. To solve this one problem, roller of long form emery wheel can be used to be opposite in actual production A ～ G and H ～ Z undertake two paragraphs respectively inclined grind to the shovel, method of this kind of treatment can make sure cutting tool weighs the tooth form after grinding already, can save cutting tool to make man-hour again. 1.

The shovel is ground with emery wheel roller 2.

Form of cut of emery wheel roller 3.

The axial cut form of primitive cutting tool 4.

Work check form pursues if the graph is shown 2 times,truncate of 2 emery wheel is calculated, when undertaking to milling cutter radial shovel is ground, for form of cut of computational emery wheel, need foregone and the following parameter: Api of deepness of work check form, be shovelled to grind Gfa of the horn before milling cutter external diameter locates end panel, be shovelled to grind R0 of milling cutter radius, be shovelled those who hold the post of a bit A to grind milling cutter tooth form to go up extremely horny Di, li of width of form of milling cutter cut, be shovelled to grind milling cutter to assume office the arrowy diameter Ri that a bit A is in, be shovelled to grind mill tooth to count Z0, shovel K back an amount. Axial dentiform ordinate will be nodded to take the place of each when A of form of cut of milling cutter axial nods the coordinate of place to be calculated for Ti(can) , formula of computation of truncate of the emery wheel when radial shovel is ground is Ri=r0-Tidi=arcsin[(r0/ri)singfa]-gfa to given already workpiece (milling cutter) , coordinate of each paragraphs axial tooth form era enters iteration formula, can calculate the GX(I) of form of emery wheel cut when giving Q=0 ° and GY(I) . Analysis of element of truncate of 2 influences emery wheel is inclined when be being ground to the shovel, emery wheel has the campaign that shovel a back already () of Archimedes helix motion, have again inclined move to cent, right now form of emery wheel cut basically suffers the effect of the element such as parameter of geometry of D of diameter of Q of inclined shovel angle, emery wheel, workpiece. The influence of Q of inclined shovel angle is shown 3 times like the graph, if use K of identical the quantity that shovel a back, because of NP1=K/tana1, NP2=K/tana2(a1, a2 nods) of the horn after the radial of place and inclined Xiang Dingren for A respectively, because of NP1=NP2cosq, so Tana2=tana1cosq, namely radial and inclined to the role after carrying blade on the head is different. If the role after radial and inclined Xiang Dingren is same, namely A1=a2, can get K2=K1/cosq, namely K value increases. The magic art that chooses the A on cutting blade backward horn is written down for AnA, it and the relation that shovel the horn after grinding are TananA=tana2sinq. Because of Tana2=tana1cosq, so TananA=(1/2)tana1sin2q, namely Sin2q=2tananA/tana1. In actual production, can choose value of Q of inclined shovel angle according to machining need, determine the value of D1 of equivalent workpiece diameter thereby. Manage good cutting property to assure A2B, choose AnA=3 ° to pursue normally Q of angle of 3 inclined shovels pursues 4 inclined if the influence that grinds D of diameter of sketch map emery wheel to the shovel pursues 4 are shown, set X to be the acme of next tooth, inclined when the dot that goes up when emery wheel diameter to the requirement when the shovel is ground has not arrive or just arriving at X to nod, cam must return, will destroy the axial cut form of next tooth otherwise. According to characteristic of emery wheel structure knowable, the maximum of the smallest diameter should be emery wheel Ø75mm, can conclude from this value of K of quantity of back giving a shovel is about 2, enter D1 and K=2 era iteration formula, and dot of coordinate of recount tooth form, can get the actual cut look of emery wheel. Additional, because be opposite the knife cannot be very accurate, the emery wheel when because this should consider a shovel,be being ground is strung together need. For this, answer emery wheel roller corresponding paragraph dimension is made adjust accordingly. CNC Milling