A computer program has been developed to simulate a gear shaving process. The present paper describes a new cutting model of a shaving process so as to incorporate the effect of a cutting performance of a shaving cutter into the simulation program. This cutting model is constructed on the assumption that an excess depth of cut over a certain criterion yields a material removal from a tooth flank of work gear. In addition, the criterion has no definite value, but its value shows the normal distribution. The mean value of the distribution can define a characteristic of cutting performance of the shaving cutter. A small mean value means that even small depth of cut can cause a stock removal. In other words, the cutter has a good cutting performance. After reliability being confirmed, computer simulations reveal an effect of the cutter performance on shaved tooth form. As a result, a pressure angle error on the shaved tooth profile becomes remarkable as the cutter performance becomes worse. Therefore, the developed computer simulation program is useful for the design of the shaving cutter and judgment of tool life expiring.

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