Shape Measuring Apparatus Velocity Vector Control
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Solution Overview
Problem
Existing shape measuring apparatuses face challenges in achieving high-speed and high-accuracy measurements, as nominal scanning lacks consideration for probe deflection variations, leading to potential stylus tip separation from the workpiece surface, while autonomous scanning requires low probe movement speeds for accurate measurements, resulting in long measurement times.
Innovation Solution
A shape measuring apparatus that combines a probe with a stylus tip, a movable mechanism, and a control system to calculate and adjust velocity vectors, ensuring the stylus tip moves along a set path while maintaining a constant deflection, using path, push correction, and locus correction vectors to prevent separation and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nominal scanning is used to achieve high-speed measurement, then measurement speed is improved, but measurement accuracy deteriorates due to stylus tip separation from the workpiece surface
Solution Approach 1:
The system continuously monitors the actual deflection of the probe during measurement and compares it with the reference deflection. Based on this feedback, the control device dynamically adjusts the probe movement velocity to maintain constant contact force, preventing stylus tip separation while enabling high-speed measurement along predetermined paths.
Solution Approach 2:
The probe movement velocity is transformed from a static predetermined value to a dynamic value that automatically adjusts during measurement. The velocity is modified based on real-time deflection detection, allowing the system to maintain optimal contact conditions while moving along the predetermined measurement path at high speed.
2Measurement precision
If autonomous scanning is used to maintain constant deflection and prevent stylus tip separation, then measurement accuracy is improved, but measurement time increases due to low probe movement speed
Solution Approach 1:
The measurement path and velocity profile are predetermined based on design information before the actual measurement begins. This preliminary planning allows the probe to move at high speed along optimized paths while the feedback control ensures constant deflection is maintained, combining the speed advantage of nominal scanning with the accuracy of autonomous scanning.
3Productivity
If probe movement speed is increased for high-speed measurement, then productivity is improved, but locus deviation of the probe from the predetermined path increases
Solution Approach 1:
The system detects the actual locus deviation of the probe from the predetermined path in real-time and uses this feedback to dynamically adjust the probe movement velocity. When deviation is detected, the velocity is modified to guide the probe back toward the intended path, enabling high-speed measurement while maintaining path adherence accuracy.
Data Source
AI summary
A shape measuring apparatus includes: a probe having a stylus tip; a movable mechanism configured to move the stylus tip; an information acquiring unit configured to acquire design information of a workpiece; a path setting unit configured to set a path of the stylus tip; a path component calculating section configured to calculate a path velocity vector; a push direction component calculating section configured to detect a deflection, and calculate a push correction vector; a locus correction component calculating section configured to detect an amount and a direction of locus deviation of the probe from the path, and calculate a locus correction vector; a velocity synthesizing section configured to calculate a velocity synthesis vector by combining the path velocity vector, the push correction vector, and the locus correction vector; and a drive control unit configured to move the probe according to the velocity synthesis vector.