Transcription of The Gear Hobbing Process
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The Gear Hobbing Process
:38 GEARTECHNO~OGYThe Gear HobbingProcessDennis ,GimpertK'oepfer America Limited Partnership"South Hobbing is a generating proces .The termgeneratingrefers to the factthat the gear tooth form cut is lIotlllcconjugate form of the cutting tool,lhehob. During Hobbing both the hob and theworkpiece rotateilla continuous [)uringthis rotation, the hobitypically fed axiaUywithallthe teeth beinggradually formed as the tool traverses the workface (see ).FOIl"a spur gear being cut with a single starthob, the workpiece will advance one tooth foreach revolution of the cutter. Wilen bobbing atwenty-tooth gear" the hob will rotate twentytimes, while the workpiece will rotate profile is formedbythe equally spacedcutting edgesaroundthehob, each taking sue-cessive cuts on the workpiece, with the work-piece ,in a slightly different po ition for eachcut (see Fig.]
the number of threads ill the hob. '. A means of traversing the curnag too! across the face of the work in the direction of the work axis for spur and helical gears. • A means of adjusting the center distance of the work and the hobs for different size workpieces, Figs. 8-W show schematics for three typical bobbing machines. Hobbing Feed
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