Numerical analysis of tooth forms of shaved gears. 3rd Report. Analysis of cutting mechanism.

Abstract

In the previous reports, the simple analytical model of cutting mechanism in gear shaving was proposed, and a computer simulation program for gear shaving was developed on the basis of this model. Using this simulation program, the calculated tooth forms of the shaved gears showed a good qualitative agreement with the measured ones, but they were rugged tooth forms superimposed on the measured ones. In the present report, we analyze a cutting mechanism in gear shaving to propose a more precise model. As a result, it is found that there are three states of contact between the land of the cutter and tooth flank of the work-gear. Penetration tests are carried out to obtain the empirical equations which represent the relations between the depth of the penetration and the resistance to the penetration of a cutter land edge to a work-gear tooth flank. In these tests, tool rollers with and without serrations are applied to a steel block. Using the empirical equations obtained here, the calculated tooth forms of shaved gears show no rugged shape. It can be concluded that a more reliable computer simulation program has been developed.