Reference Surface Position Measurement Using Maximum Height Detection
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Solution Overview
Problem
The existing position measuring methods for reference surfaces using spherical probes and fixing tools with different diameters can result in measurement errors due to the probe entering depressions on the workpiece surface, leading to discrepancies between the measured and actual positions of the reference surface, especially on workpieces with rough asperities.
Innovation Solution
A position measuring method that involves bringing a probe into contact with the reference surface at multiple positions, measuring the height, and setting the position with the largest height as the reference surface position, ensuring accurate measurement by reducing errors between the probe's contact point and the fixing tool's contact point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a small-diameter spherical measuring portion is used to measure the reference surface, then the probe can access more positions on the surface, but the probe enters depressions caused by surface asperities leading to measurement errors
Solution Approach 1:
The method performs preliminary measurements at multiple positions around the reference surface before determining the final reference position. By measuring heights at multiple positions and identifying the maximum height position in advance, the system prepares correction data that compensates for the probe entering depressions, thus resolving the contradiction between accessibility and measurement accuracy.
2Measurement precision
If a large-diameter spherical portion is used for fixing the workpiece, then the fixing tool does not enter surface depressions, but the diameter mismatch with the small probe creates deviation between measured and actual reference surface positions
Solution Approach 1:
The system uses feedback from multiple height measurements to identify the actual reference surface position. By measuring at multiple positions and using the maximum height as the reference, the system creates a feedback mechanism that compensates for the diameter mismatch between the fixing tool and probe, ensuring both accurate reference identification and subsequent machining precision.
3Measurement precision
If multiple positions are measured to compensate for surface asperities, then measurement accuracy improves, but the measurement process time increases
Solution Approach 1:
The method performs measurements at multiple positions (excessive action) but only processes the essential data needed - specifically identifying the maximum height position among the measured points. This partial processing approach achieves the necessary measurement precision without requiring complex analysis of all measurement points, thus reducing the time loss while maintaining accuracy.
Data Source
AI summary
A position measuring method is a method of measuring, by a probe, a position of a reference surface of a workpiece that is supported by a fixing tool when the workpiece is machined. According to the position measuring method, the probe is brought into contact with the reference surface at a plurality of different positions, and a height of the reference surface is measured. Then, a position at which the height of the reference surface is largest is set as the position of the reference surface.