Rough machining of super large modified gears

According to the characteristics and cutting pattern of hobbing super large modified gear, the maximum wear of hob occurs at the corner fillet of left and right top edge and side edge of some cutter teeth near the starting point, while the wear of other cutter teeth is very small.

In view of the disadvantage of large cutting load near the starting point when the standard hob is segmented hobbing, the hob with cutting cone is selected to reduce the peak value of cutting load of cutter teeth, make the cutter teeth wear more evenly, reduce the non-uniformity of cutter teeth load, and correspondingly reduce the axial feed. The tool teeth with chip separation groove are used to remove the Γ – and Γ – shaped chips, mainly to solve the wear of the tool teeth. Increase the fillet radius of hob tooth tip to reduce the wear at the corner of hob tooth tip. Using staggered hob to reduce the change of hobbing force, using hob with chip breaking groove teeth to solve the problem of insufficient chip space of hob, forming method or comb method can also be used to decompose or balance the peak value of cutting load during hobbing.

In addition, if it is possible to use multi head or multi-stage assembled hob with staggered chip holding groove, the productivity of gear hobbing will be significantly improved. For example, the cutting efficiency of double head hob is 40% – 60% higher than that of single head hob.

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