Abstract
Sharpening of a hob with helical flutes is a difficult problem in the gear production field because interference between a grinding wheel and hob rake face is apt to occur. In this paper, mechanism of interference in hob sharpening is analyzed and the condition without interference that causes a trouble is shown by means of the figure. Then, the profile of grinding wheel for sharpening the hob with helical flutes is calculated using the element removal method in the same way as form grinding of the helical gear with a profile of straight line. Also, the relation between the depth of hob flute and the tooth height of hob rake face being finished is shown by means of the figure. The sharpening test of the involute worm hob(mn=5, N=3, γ=23.917°)was conducted using the CNC gear form grinding machine. The radial alignment of hob rake face after sharpening was less than 5μm.
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