Общий каталог ZCC-CT 2019 - страница 456

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TurningMillingDrillingTechnicalInformationIndex Technical information – turning Technical information Turning toolsEntering angle (main cutting edge) A Reducing the lead angle increases the strength of the cutting edge. Because the lead angle is small, the cutting width is long, the force on the unit cutting edge length is small. At the same time, reducing the lead angle can increase the tool life. Normally, when turning thin long shaft and ladder shaft, the lead angle adapts 90°. The lead angle is increased, radial force is reduced, cutting is stable, cutting thickness is increased and chip breaking performance is good. Entering angle Applications Minor cutting Small For material with high tensile strength, high hardness or hardened layer on Entering anglesurface(main cuttingedge angle Large For machining with low rigidity edge) Minor cutting edge B The minor cutting edge angle is the main angle on influence surface roughness; its size is also influence strength of cutter. When the minor cutting edge angle is too small, the cutting force increases and results in chattering and vibration. The selection principle for the minor cutting edge angle is under the condition of rough machining, or un-influencing friction and producing vibration, the smaller angle should be chosen; the bigger angle can be used for precision machining. Nose radius The nose radius effects the cutting edge strength and the finished surface. By increasing the nose radius the surface finish becomes better and the cutting edge strength improves. Flank and rake wear decreases. If the radius becomes too big, the cutting force increases and causes vibration which effects the chip control negative. Radius Applications C Small Finishing with small cutting depth, machining thin long shaft, rigidity of machine is insufficient Rough machining, high cutting edge strength is required, rigidity of machine is good, Large machining hardened materials and interrupted cut D E A 451