Каталог Dormer Pramet фрезерование 2021 - 2022 - страница 777

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9 TECHNOLOGIES Milling using Circular or Helical Interpolation This method is analogous to ramping, except it is performed face of the tool and may potentially destroy the tool completely. along a circular path. In this case, one of the most important fac- On the other hand, if the diameter of the milling cutter is too small, tors is the milling cutter diameter or minimum and maximum di- the core will remain inside the hole axis and must then be milled off ameter of the hole we are able to machine with the given milling separately. cutter type (this information is vital only when using milling cut- ters without central cutting edges). If the milling cutter diameter is too large, the path of the insert will not pass through the axis of the hole, resulting in a protrusion which will collide with the DC d1 DC d1 DC d1 DC = cca 0,5 × d1 DC > 0,5 × d1 DC < 0,5 × d1 Dmax – Hole diameter DC – Milling cutter diameter INSD – Insert diameter RE – Insert corner radius BS – WIPER edge length b – Max. ae for grooving Maximum hole diameter For blind holes, you can achieve a flat bottom by having the tool pass over the bottom's centre. For through hole: For through hole: Dmax = 2 . DC Dmax = 2 . DC Minimum hole diameter For through hole: For through hole: Dmin = (DC - b) . 2 Dmin = (DC - 0.8 INSD) . 2 For flat bottom: For flat bottom: Dmin = (DC - (RE + BS)) . 2 Dmin = (DC - 0.5 INSD) . 2 Recommendations include tables listing the minimum hole diameter, maximum hole diameter and in-axis descent angle values for these diam- eters (in some cases there will be two tables: one for standard insert geometry and another for HFC). 776