Method of phasing threaded grinding stone, as well as device therefor

摘要

Provided is a method of phasing a threaded grinding stone, as well as a device therefor, the aforementioned method and device being such that contact or non-contact of a threaded grinding stone with a disk dresser can be detected with high accuracy, with the result that the phasing of the threaded grinding stone can be accurately performed. For the purpose of achieving the above, a threaded grinding stone (14) is phased with respect to a disk dresser (32) prior to the engagement of the threaded grinding stone (14) with the disk dresser (32) during dressing. In performing this phasing, it is determined whether or not the threaded grinding stone (14) contacted the disk dresser (32), on the basis of a voltage (V) which is commensurate with the amplitude of the elastic wave generated in the threaded grinding stone (14) at the time when the threaded grinding stone (14) contacted the disk dresser (32). In a case where the voltage (V) does not exceed a threshold value (Vo) even if the threaded grinding stone (14) contacts the disk dresser (32), then the rotational speed of the disk dresser (32) is increased, with the result that there is forcibly created a situation where it is determined that contact occurred. Subsequently, the threaded grinding stone (14) is positioned, on the basis of the resulting phase thereof, in an intermediate phase where the aforementioned engagement is feasible.

主权项

1. A phasing method for a threaded grinding wheel, in which the threaded grinding wheel is phased with a dresser prior to the engagement of the threaded grinding wheel with the dresser during dressing, the method characterized by comprising:
rotating the threaded grinding wheel in one direction; detecting elastic waves generated when one of thread surfaces of the threaded grinding wheel comes into contact with a corresponding one of blade surfaces of the dresser; increasing the number of rotations of the dresser until a measured value on one direction side corresponding to the elastic waves exceeds a predetermined value in a case where the measured value on the one direction side does not exceed the predetermined value even if the threaded grinding wheel comes into contact with the dresser; storing a phase on the one direction side of the threaded grinding wheel once the measured value on the one direction side exceeds the predetermined value; rotating the threaded grinding wheel in the other direction; detecting elastic waves generated when the other one of the thread surfaces of the threaded grinding wheel comes into contact with the other one of the blade surfaces of the dresser; increasing the number of rotations of the dresser until a measured value on the other direction side corresponding to the elastic waves exceeds the predetermined value in a case where the measured value on the other direction side does not exceed the predetermined value even if the threaded grinding wheel comes into contact with the dresser; storing a phase on the other direction side of the threaded grinding wheel once the measured value on the other direction side exceeds the predetermined value; and positioning the threaded grinding wheel at a phase where the engagement is feasible, on the basis of the phase on the one direction side and the phase on the other direction side of the threaded grinding wheel.