Общий каталог ZCC-CT 2019 - страница 929

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TurningMillingDrillingTechnicalInformationIndex Technical information Technical information – milling A Indexable milling Pitch selection The pitch is the distance between one point on one cutting edge and the same point on the next edge. Milling cutters are mainly classified into wide, normal and fine pitches. Operational stability L (low) M (medium) H (high) Wide pitch Normal pitch Fine pitch B When the milling width is equal to the diam- General milling function and multiple mixed When the milling width is less than the diam- eter of the cutter, the machining system is productions. eter of cutter, cutting by maximum edges can stable and main power of machine is sufficient, achieve high productive efficiency. selecting a wide pitch can achieve high pro- ductive efficiency. C Approach angle The approach angle is composed by insert. Tool body, chip thickness, cutting forces and tool life are affected especially by the approach angle. Decreas- ing the approach angle reduces chip thickness and spreads the cutting area between cutting edge and work piece for a given feed rate. A smaller approach angle also guarantees stable entering or exiting the work piece, to protect the cutting edge and extend tool life. However this will increase higher axial cutting forces on the work piece, thus it is not suitable for machining thin work piecees such as thin plates. Approach angle Feed rate per tooth Max. cutting depth 90° hex = fz × sinkr D 75° hex = 0,96 × fz 60° fz hex = 0,86 × fz 45° hex = 0,707 × fz Round hex = i C 2× ( i C − 2 a p) 2iC× fz E B 466