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        An improved design of inserted tooth finishing hob for involute gears

        Hu Yong,Xiang Mingjun,Qiu Xing,Song Pengfei,Song Jingan,Peng Fuhua 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.8

        Gear hobs are widely used to machine involute gears. However, using Archimedes worm as a base worm of the gear hob, which iscommon used in industry, leads to the generating of theoretical error of the gears. Even though this error can be eliminated by using theaccurate involute base worm or be greatly reduced by complicated modification of the shape of cutting edges, the manufacturing cost isvery high. Reported in this paper is an improved design of inserted tooth finishing hob for involute gears on a conventional hobbing machineaiming to eliminate this error in an economical way. For that purpose, both descriptive-geometry-based method and mathematicalanalyzing are employed to illustrate the major parameters of the base worm and the formation and parameters of the inserted tooth finishinghob. In addition, an approximating formation of the flank for the convenience of grinding the inserted tooth finishing hob is proposedand the errors that this substitution arc surface is discussed. Ultimately, the other advantages of this inserted finishing hob are demonstrated.

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