Patent ID: 8944885
Filing Date: 2015-02-03
Classification: B23F,B24B

Abstract:
1. A phasing device for a threaded grinding wheel, the phasing device phasing the threaded grinding wheel with a gear to be machined ahead of meshing of the threaded grinding wheel with the gear at the time of a grinding process, the phasing device comprising: detection means for detecting whether or not the threaded grinding wheel has come into contact with the gear, the detection means being provided on a grinding wheel head by which the threaded grinding wheel is rotatably supported; and grinding wheel phase control means for positioning the threaded grinding wheel so that the threaded grinding wheel has a phase which allows meshing, based on a phase of the threaded grinding wheel when the detection means detects the contact, wherein the detection means is an acoustic emission fluid sensor which detects elastic waves generated in the threaded grinding wheel due to vibration or friction through fluid jetted to the vicinity of the threaded grinding wheel, the detection means is located at any of positions shifted in phase by 90 degrees in a circumferential direction of the threaded grinding wheel from a contact position between the threaded grinding wheel and the gear, according to whether the gear is right-hand helical or left-hand helical, and based on the detected elastic waves, the detection means determines whether or not the threaded grinding wheel has come into contact with the gear.