Importance

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Abstract

A forming method for milling teeth of variable tooth worms (VTW) with the following features: on a multi-axis simultaneously-working CNC machine-tool a moving coordinate system {.sigma..sub.1(.phi..sub.1)[O.sub.1;{right arrow over (i)}.sub.1(.phi..sub.1),{right arrow over (j)}.sub.1(.phi..sub.1),{right arrow over (k)}.sub.1 (.phi..sub.1)]} is correlated to the worm blank of the VTW worms, whereon the worm blank of the VTW worms rotates around {right arrow over (k)}.sub.1(.phi..sub.1)-axis at angular speed |{right arrow over (.omega.)}.sub.1|; another moving coordinate system {.sigma..sub.2(.phi..sub.2)[O.sub.2; {right arrow over (i)}.sub.2(.phi..sub.2), {right arrow over (j)}.sub.2(.phi..sub.2), {right arrow over (k)}.sub.2(.phi..sub.2)]} is correlated to the milling cutter, whereon the milling-cutter rotates around {right arrow over (k)}.sub.2(.phi..sub.2)-axis at angular speed |{right arrow over (.omega.)}.sub.2|, |{right arrow over (.omega.)}.sub.1|/|{right arrow over (.omega.)}.sub.2|=i.sub.12 and i.sub.12 is a constant; the feed motion of the milling cutter comprises the radial shift along {right arrow over (i)}.sub.2(o.sub.2)-axis and the peripheral shift around {right arrow over (k)}.sub.2(.phi..sub.2)-axis; the equations of the cutting edge of the milling cutter are given as below x=u y.sub.2=r.sub.b-v sin .beta. z.sub.2=v cos .beta..

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First Claim