Method for dressing threaded grinding stone for internal gear grinding
Disclosed is a method for dressing a threaded grinding stone for internal gear grinding, by which a threaded grinding stone for grinding an internal gear can be dressed with a high degree of accuracy by using a dressing gear that has been produced with a high degree of accuracy. In a state in which a barrel-shaped threaded grinding stone ( 11 ), which is disposed at an axial angle (Σ) to the internal gear (W) that is conferred during the grinding of said internal gear (W), and an external tooth-type dressing gear ( 13 ), which is capable of meshing with a virtual external gear ( 14 ) virtually formed in a manner so as to mesh with the internal gear (W) in place of the threaded grinding stone ( 11 ) disposed at the axial angle (Σ), have been meshed together, the threaded grinding stone ( 11 ) and the dressing gear ( 13 ) are simultaneously rotated while being moved relatively in a circular arc in the X-Y plane, whereby the dressing gear ( 13 ) dresses along the entire area in the axis direction of the threaded grinding stone ( 11 ).
1. A method for dressing a threaded grinding wheel for internal gear grinding characterized in that a barrel-shaped threaded grinding wheel and an externally-toothed dressing gear are rotated in synchronization with each other and moved relative to each other in an arc within a plane in a state where the threaded grinding wheel and the dressing gear are in mesh with each other, so as to cause the dressing gear to dress the threaded grinding wheel over an entire area thereof in a direction of an axis of the grinding wheel, the threaded grinding wheel being disposed at a crossed axes angle to an internal work gear which is given to the threaded grinding wheel during grinding of the internal work gear, the dressing gear being capable of meshing with a virtual external gear which is virtually designed to mesh with the internal work gear in place of the threaded grinding wheel disposed at the crossed axes angle,
the virtual external gear is virtually created as an external gear in which all tooth parts are exactly the same as shapes of all tooth spaces of the internal work gear, and
the dressing gear is moved in mesh with the virtual external gear when the dressing gear is moved in the arc within the plane.