Patent ID: 7198543
Filing Date: 2007-04-03
Classification: B23F,B24B

Abstract:
1. A gear grinding machine, comprising: a moving mechanism rotatably mounted with a threaded grinding wheel having threads spirally formed on an outer peripheral surface thereof, and arranged to move the threaded grinding wheel along an X-direction being a direction in which the threaded grinding wheel advances or retreats with respect to a work machining position, a Z-direction being a vertical direction, and a Y-direction being a direction perpendicular to the X-direction and the Z-direction, and to turn the threaded grinding wheel in a Y-Z plane; an NC device for numerically controlling movement of the moving mechanism in order to control a position of the threaded grinding wheel mounted on the moving mechanism; and a rotary dressing device having a disk-shaped dressing tool, and arranged such that when the rotary dressing device is set at the work machining position, the dressing tool contacts flanks of the threads of the threaded grinding wheel, while being rotationally driven, to perform dressing, wherein the NC device has a control function of numerically controlling the moving mechanism so as to adjust a position in the X-direction, a position in the Z-direction, and a turning position in the Y-Z plane of the threaded grinding wheel, while keeping a state of contact of the dressing tool with the flanks of the threads of the threaded grinding wheel, in order to modify a wheel pressure angle of the threaded grinding wheel.