Coordinate Transformation for Inclined Columnar Workpiece Measurement
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Solution Overview
Problem
Measurement apparatuses face challenges in accurately measuring the coordinates of columnar workpieces that are inclined with respect to the rotation axis of a rotary table, leading to measurement errors due to the need for repeated detection of support centers and rotation tracks during each measurement position.
Innovation Solution
A measurement apparatus with a first end supporter on a rotary table and a second end supporter separated from the table, along with a control part that obtains and adjusts the center and rotation track of both supporters to change the orientation of workpiece coordinate axes based on the rotary table's position, ensuring accurate measurement even if the workpiece is inclined.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the center of the sphere is detected each time the rotary table stops at the measurement position, then the measurement can be performed even if the columnar workpiece is inclined, but it takes time for the detection to be performed before the measurement starts
Solution Approach 1:
The patent applies preliminary action by detecting the center of the lower-end support part and the rotation track in advance before the actual measurement process. The control part stores this detection result and reuses it for multiple measurements, eliminating the need to re-detect the center position each time the rotary table stops. This preliminary detection resolves the contradiction by maintaining measurement accuracy while significantly reducing the time required for each measurement cycle.
Solution Approach 2:
The patent uses copying by creating a digital model (rotation track) of the lower-end support part's center position and reusing this copied information across multiple measurement positions. Instead of physically re-detecting the center each time, the system copies the previously detected center position and rotation track data, applying it to correct measurements at different angular positions. This copying approach maintains precision while eliminating redundant detection time.
2Productivity
If the columnar workpiece is supported at its top and bottom, then the workpiece can be measured during rotation, but the workpiece may be inclined with respect to the rotation axis of the rotary table
Solution Approach 1:
The patent implements feedback by continuously monitoring the rotation angle of the rotary table and using this feedback information to dynamically adjust the coordinate system transformation. The control part receives feedback on the current angular position and applies the appropriate rotation transformation to the measurement coordinates, ensuring accuracy is maintained throughout the rotation process. This feedback mechanism resolves the contradiction by enabling continuous rotation-based measurement while compensating for inclination effects in real-time.
Solution Approach 2:
The patent applies dynamics by making the coordinate system transformation dynamic rather than static. The workpiece coordinate system is continuously transformed based on the rotation angle of the rotary table, allowing the measurement system to adapt to the changing orientation of the workpiece during rotation. This dynamic coordinate transformation enables efficient rotational measurement while maintaining precision despite workpiece inclination.
Data Source
AI summary
A measurement apparatus includes: the first end supporter; the second end supporter; a probe that measures a columnar workpiece supported by the first end supporter and the second end supporter; and a control part that obtains a center and a rotation track of the first end supporter, and a center of the second end supporter when a rotary table rotates and changes the orientation of workpiece coordinate axes based on a rotation position of the rotary table when a measurement of the columnar workpiece by the probe is performed, the workpiece coordinate axes including an axis passing through the center of the first end supporter and the center of the second end supporter.