Relieving of Pinion Cutters with Hob

概要

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Relieving of pinion cutters with a hob to reduce a grinding stock in relief grinding is introduced. The profile of the hob was calculated through virtual conical hobbing (cutting of the hob by the pinion cutter with a required cutting edge). The hob was manufactured and used for conical hobbing of the pinion cutter. Obtained results are as follows. (1) Both tooth profiles of the pinion cutter conically hobbed with a standard hob are different. (2) Both pressure angles of the hob that can conically hob the pinion cutter with the exact cutting edges are different. In this case, the step is produced at the tooth top of the hob by the difference in level of the rake faces of the pinion cutter. (3) Both relief angles of the pinion cutter conically hobbed by the hob with the calculated profile are different a little. In this case, by changing the helix angle in conical hobbing, both relief angles are made equal. (4) The trial-made hob was designed and manufactured, and hobbing tests of the helical pinion cutter were conducted. As the results, the possibility was shown that a cut pinion-cutter that does not need relief grinding can be manufactured.