Abstract
Reaming is a finishing process that enlarges the drilled pilot holes to improve the accuracy of roundness. In machining using a reamer with regular tooth spacing, a polygonal deformation phenomenon called spiral mark occurs in the machined hole, due to self-excited vibration caused by time delay, which causes a problem of deterioration in product accuracy. In the previous studies, the authors clarified the generation mechanism of spiral marks and verified the suppressing effect of the spiral marks with the 6-blade irregular tooth spacing theoretically and experimentally. In this paper, the authors discuss the optimal design of 4-blade irregular tooth spacing reamers theoretically. The authors conducted the experiments to confirm the suppressive effect of the optimum design experimentally.
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