Abstract
In general, regrinding of a hob causes profile error of cutting edges. The more the number of hob threads increases and the diameter of a hob decreases, the more the profile error after regrinding increases. In this paper, a new method of relief grinding for finishing a hob having a small profile error of the cutting edges after regrinding is proposed. To finish the hob with such tooth flanks, an additional motion in the direction perpendicular to the radial direction of the hob, synchronized with the conventional relieving motion between the grinding wheel and hob, is introduced. The optimum amounts of the additional motion for finishing a multiple-thread hob are shown in terms of the proportion constant for the rotational angle of the hob. To show the validity of the new method, a five-thread hob was finished on the NC tool grinder. The accuracy of the cutting edge of the hob was in the zero class of JIS for regrinding stocks of λ=0 and 5 mm.
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