Cylinder Interior Surface Texture Measurement with Dynamic Normal Adjustment
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Solution Overview
Problem
Conventional surface texture measuring apparatuses struggle to accurately measure the interior walls of cylinders that are not perfect circles due to varying distances between the measurement sensor and the interior wall, leading to measurement inaccuracies.
Innovation Solution
A surface texture measuring apparatus equipped with a measurement sensor, normal direction displacement mechanism, circumferential direction displacement mechanism, and a controller that adjusts the measurement position based on previous measurement results to maintain accurate distance and orientation, allowing for detailed surface texture measurement of interior walls within cylinder portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a measurement sensor is rotated within a cylinder portion to measure surface texture, then measurement can be performed without contact, but measurement accuracy deteriorates when the cylinder portion is not a perfect circle due to varying distance between the sensor and interior wall
Solution Approach 1:
The patent applies dynamics by making the measurement sensor movable in the normal direction of the interior wall surface, allowing it to dynamically adjust its position to maintain a constant measurement distance even when the cylinder portion is not a perfect circle. This resolves the contradiction by enabling non-contact measurement while preserving accuracy through dynamic position adjustment.
Solution Approach 2:
The patent implements feedback control by using the controller to adjust the measurement sensor's normal direction position based on real-time measurement conditions. The controller receives information about the cylinder's actual geometry and automatically compensates for deviations from a perfect circle, maintaining measurement precision while enabling non-contact operation.
2Device complexity
If the measurement sensor position is kept constant in the normal direction, then the device structure is simple, but measurement accuracy deteriorates when the interior wall is not perfectly circular
Solution Approach 1:
The patent transforms the static measurement sensor positioning into a dynamic system where the sensor can move in the normal direction. This dynamic capability allows the sensor to adapt to varying interior wall geometries, maintaining measurement accuracy without requiring overly complex positioning mechanisms, as the adjustment is limited to the normal direction only.
Solution Approach 2:
The patent changes the positional parameter of the measurement sensor in the normal direction based on the actual geometry of the interior wall. By adjusting this single critical parameter dynamically, the system achieves high measurement accuracy for non-circular cylinders without significantly increasing overall device complexity.
3Measurement precision
If the measurement sensor is adjusted to maintain constant distance from the interior wall, then measurement precision is improved, but the device complexity increases due to additional displacement mechanisms and control systems
Solution Approach 1:
The patent segments the displacement control into specific directions: the normal direction displacement mechanism and controller are added only where needed to maintain measurement accuracy, while other degrees of freedom remain simpler. This segmentation allows precision improvement without proportionally increasing overall device complexity across all axes.
Solution Approach 2:
The patent applies enhanced positioning control locally at the measurement sensor in the normal direction, rather than throughout the entire measurement system. This localized quality improvement focuses complexity only where it is necessary for measurement accuracy, keeping the rest of the system relatively simple.
Data Source
AI summary
A surface texture measuring apparatus includes: a measurement sensor measuring, without contact, a surface texture of an interior wall of a cylinder portion of a measurable object while displacing in a normal direction of the interior wall at each measurement region into which the interior wall is divided in a circumferential direction of the cylinder portion; a W axis displacer displacing the measurement sensor in a W axis direction; a θ axis displacer displacing the measurement sensor in the circumferential direction, after measurement of the surface texture of a first measurement region, such that the measurement sensor faces a second measurement region adjacent to the first measurement region in the circumferential direction; and a controller adjusting a W axis direction measurement position for measuring the surface texture of the second measurement region while displacing the measurement sensor in the W axis direction.