Mitsubishi Heavy Industries Limited

Kazuyuki Ishizu

Yoshikoto Yanase

Tomohito Tani

Koichi Masuo

A device for phasing a threaded grinding stone is phased with respect to a workpiece or a disk dresser prior to the engagement of the threaded grinding stone with the workpiece or with the disk dresser during grinding or dressing. In performing this phasing, it is detected, by means of an AE fluid sensor provided to a grinding stone head which rotatably supports the threaded grinding stone, whether the threaded grinding stone has had contact with the workpiece or the disk dresser. Subsequently, on the basis of the phase of the threaded grinding stone at the time when contact was detected, the threaded grinding stone is positioned in a phase where the aforementioned engagement is feasible.

Device for phasing threaded grinding wheel

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 () is phased with respect to a disk dresser () prior to the engagement of the threaded grinding stone () with the disk dresser () during dressing. In performing this phasing, it is determined whether or not the threaded grinding stone () contacted the disk dresser (), on the basis of a voltage (V) which is commensurate with the amplitude of the elastic wave generated in the threaded grinding stone () at the time when the threaded grinding stone () contacted the disk dresser (). In a case where the voltage (V) does not exceed a threshold value (Vo) even if the threaded grinding stone () contacts the disk dresser (), then the rotational speed of the disk dresser () is increased, with the result that there is forcibly created a situation where it is determined that contact occurred. Subsequently, the threaded grinding stone () is positioned, on the basis of the resulting phase thereof, in an intermediate phase where the aforementioned engagement is feasible.

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

A backlash eliminator includes an input shaft () coupled to a driving motor () and having a drive gear (); an output shaft () fixing a gear (W), as an object to be cut, thereon, and having a driven gear (); and a stationary intermediate shaft () and a moving intermediate shaft () disposed parallel to the input shaft and the output shaft, and having large intermediate gears () meshing with the drive gear, and small intermediate gears () meshing with the driven gear, and a switching regulating valve () for pressing the moving intermediate shaft in its axial direction so that an output-side backlash elimination torque (Ts) between the driven gear and the small intermediate gear () acts in the same direction as the direction of generation of a cutting load torque (Tw) generated in the circumferential direction of the gear during machining of the gear.

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Ritto, Japan

Kazuyuki Ishizu