Gear phase detecting method, gear manufacturing method, workpiece edge position detecting method, and machine tool for detecting gear phase

摘要

The phase detection method of the gear (G) is a first indicating whether or not the gear (G) is detected at the first detection position (dp1) having the first angle (P1) in the circumferential direction of the rotation axis (A4). Obtain the judgment result. Indicates whether or not the gear (G) is detected at the second detection position (dp2) having a second angle (P2) different from the first angle (P1) in the circumferential direction from the reference position (RL), and the first A second determination result different from the determination result is obtained. A third angle (P3) between the first angle (P1) and the second angle (P2) is obtained. A third determination result indicating whether or not the gear (G) is detected at the third detection position (dp3) having the third angle (P3) in the circumferential direction from the reference position (RL) is obtained. If the third determination result and the first determination result are the same, the first angle (P1) is replaced with the third angle (P3). If the third determination result is different from the first determination result, the second angle (P2) is replaced with the third angle (P3). Based on the angle from the first angle (P1) to the second angle (P2), the phase (P) of the gear (G) in the circumferential direction is detected.