Gear Phase Detection by Iterative Angle Refinement
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Solution Overview
Problem
Existing methods for detecting the phase on a gear lack accuracy and efficiency, particularly in determining the angular position of tooth spaces on a workpiece, which hinders precise post-treatment processes like burr removal and finishing.
Innovation Solution
A method involving a machine tool with a spindle that rotates the gear, a sensor control circuit, and a processor to determine detection positions at different angles, replacing initial angles with median angles to refine the phase detection, allowing for accurate detection of the gear's phase in the circumferential direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single detection position is used to determine gear phase, then the detection process is simple and fast, but the detection accuracy is insufficient
Solution Approach 1:
The detection process is segmented into multiple discrete detection positions (first detection position, second detection position, third detection position) around the gear circumference. Each position provides a binary determination result (detected/not detected), and the phase is determined by comparing results across these segmented positions. This segmentation transforms a single complex measurement into multiple simple binary checks, improving accuracy without requiring complex measurement equipment at each position.
2Measurement precision
If multiple detection positions are used to improve phase detection accuracy, then detection precision improves, but detection time increases
Solution Approach 1:
The system uses binary determination results (detected/not detected) at each position rather than complete measurements. By using minimal information (presence/absence of detection) at multiple positions and combining these partial results, the system achieves accurate phase detection without performing exhaustive measurements at each position. This partial action approach reduces total detection time while maintaining precision.
Solution Approach 2:
The system uses feedback from determination results at different detection positions to refine phase detection. When the gear rotates through multiple positions, each determination result provides feedback about the gear's angular position. By comparing feedback from multiple positions and using angle replacement logic (replacing first angle with third angle when determination results match), the system efficiently converges on the accurate phase position, reducing overall detection time.
3Measurement precision
If traditional phase detection methods are used, then additional measuring devices are required, but this increases device complexity and cost
Solution Approach 1:
The detection device is designed to perform multiple functions: it can detect the gear at different circumferential positions (first, second, third detection positions) and use these detection results for phase determination. The same device structure and detection mechanism are universally applied across multiple positions rather than using specialized measuring devices for each measurement point. This multi-functionality eliminates the need for additional dedicated measuring equipment while maintaining detection precision.
Solution Approach 2:
The gear itself serves as the measurement reference by providing detectable features (teeth, tooth spaces) that the detection device can identify at different positions. The gear's own geometry and periodic structure enable the detection system to determine phase by comparing detection results across positions, without requiring external reference standards or additional measuring instruments. The system uses the workpiece's inherent characteristics for self-measurement.
Data Source
AI summary
A method for detecting a phase on a gear includes obtaining a first determination result indicating whether the gear has been detected at a first detection position. A second determination result indicating whether the gear has been detected at a second detection position is obtained. A third angle between the first and second angles is obtained. A third determination result indicating whether the gear has been detected at a third detection position is obtained. The first angle is replaced with the third angle when the third and first determination results are same, or the second angle is replaced with the third angle when the third and first determination results are different. The phase on the gear is detected based on an angle that is between the first angle and the second angle.