Transcription of The Gear Hobbing Process - Gear Technology
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The Gear Hobbing Process - Gear Technology
: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. Ib). Several cutting edge of thetool will be cutting at the arne hobisbasically a wonn with acrossitto produce these cuttingedges.]
the following formula: Tan a = Thread in Hob DP x Hob Diameter Example: Tan a=_]_ 20x.2 Tan ,a =.025 a= 1° 2S' 56" Another problem with multiple thread hobs is the number of effective gashe generating lbe profile, Again. all factor being equal. a two-start hob with twelve gashe will generate the gear profile with six of the gashes ver usa
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