A Study on NC Gear Cutting of Large-size Bevel Gears : 2nd Report; End-milling for the Taper Tooth

概要

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The first report investigated some practical problems of a new cutting method which makes it possible to cut the bevel gears almost correctly by single traverse end milling. But, this cutting method gives a constant tooth depth instead of a variable tooth thickness which is surely better when we take the bending strength into consideration. This paper proposes a new cutting method which gives a tooth depth varying almost proportionally to the tooth thickness and retains the merits of the single traverse end milling. Using this cutting method, plastic gears are cut trially by a numerically controlled machine tool which was made in the authors' laboratory. The design procedure for the root angle and the pressure angle are described and the conjugation of the gear teeth is analyzed theoretically. This analysis shows that the deviation from the perfect conjugation increases as the tooth depth becomes large. This deviation can be reduced by means of profile modifications of cutter.
一般社団法人日本機械学会の論文