Patent ID: 8944890
Filing Date: 2015-02-03
Classification: B23F,B24B

Abstract:
1. A method of dressing a barrel-shaped threaded tool by meshing the threaded tool with a disk-shaped dresser, the threaded tool being formed into a barrel shape having a diameter gradually decreasing from an axially intermediate portion of the threaded tool toward axially opposite end portions thereof so that the threaded tool is meshed with a to-be-machined internal gear at a crossed axes angle therebetween during grinding of the to-be-machined internal gear, the to-be-machined internal gear being rotatable about a work rotation axis, the method being comprising: rotating the dresser about a dresser rotation axis and turning the dresser about a dresser pivot axis perpendicular to the dresser rotation axis; and rotating the threaded tool about a tool rotation axis and moving the threaded tool in a vertical direction, a direction in which a distance between the tool rotation axis and the dresser rotation axis is adjusted, and a direction perpendicular to both the tool rotation axis and the direction in which the distance between the tool rotation axis and the dresser rotation axis is adjusted, wherein the dresser the threaded tool