Каталог Tungaloy зубофрезерование - страница 59

In simple terms, gear skiving can be viewed as a combination of hobbing and gear shaping, combining some of the advantages of both ∑ : cross-axis angle machining processes. Primarily, these are the productivity of hobbing and β0 : helical angle of tool the flexibility of gear shaping. Especially when machining internal gears β2 : helical angle of gear compared to gear shaping, the gear skiving process scores with significantlyhigher productivity. Machining times for gear skiving are around 30% to 50%compared to the gear shaping process. In contrast to gear shaping, however,v2: cutting speed work gearv0: cutting speed toolvs:  resulting cutting speed due to the inclined position of the tool in relation to the workpiece (cross- axis angle), gear skiving requires a machining path that is slightly larger than the width of the gearing to be produced. These additional paths are called approach and overrun distance. They increase as the cross-axis angle increases. Due to these necessary approach and overrun distances, gear ski- ving has few restrictions compared to gear shaping with very narrow internal gears and interfering contours. For the majority of applications that were pre- viously reserved for gear shaping, gear skiving is a much more productive and economical machining method. 59