Shape Measurement Scan Control With Synchronized Rotary Motion
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Solution Overview
Problem
Existing shape measuring apparatuses face inefficiencies in measuring complex objects due to complicated probe motion, leading to slow measurement times and potential interference between the stylus and the workpiece.
Innovation Solution
A method that synchronizes translation and rotary movement mechanisms to control the probe along a set scanning path, using translational and rotational velocity commands to optimize the motion and reduce rotation amounts, allowing for more efficient scanning of complex shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the probe moves along a complex scanning path to measure complicated shapes, then measurement coverage is improved, but measurement time increases and productivity decreases
Solution Approach 1:
The patent applies dynamics by making the scanning path adaptive rather than fixed. The measurement path is dynamically adjusted based on the actual workpiece geometry detected during measurement, allowing the system to optimize the scanning route in real-time. This enables comprehensive coverage of complicated shapes while minimizing unnecessary movements, thereby reducing measurement time and improving productivity.
2Measurement precision
If the probe follows a predetermined scanning path, then measurement accuracy is improved, but the stylus may interfere with the workpiece
Solution Approach 1:
The patent implements feedback by continuously monitoring the actual workpiece geometry during measurement and using this information to adjust the scanning path in real-time. The system compares measured points with the predetermined path and dynamically modifies the trajectory to maintain accurate measurement while avoiding stylus interference with the workpiece.
3Measurement precision
If the scanning path is calculated based on design data with offset compensation, then measurement accuracy is improved, but the motion control complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating the offset scanning path based on design data and stylus radius compensation before measurement begins. This preliminary path planning incorporates the necessary geometric offsets and constraints, allowing the measurement system to follow a pre-optimized trajectory that ensures accuracy while simplifying real-time control during actual measurement.
Data Source
AI summary
There is provided a method for controlling a shape measuring apparatus that relatively moves a probe and a workpiece with a translation movement mechanism and a rotary drive mechanism to perform scanning measurement on the workpiece by moving the probe along a scanning path set in advance.The method includes setting, by an operator, a scanning path and a rotation angle command for the rotary drive mechanism, dividing data about the scanning path into a plurality of segments and setting a translational velocity pattern of the translation movement mechanism for each segment, calculating for each segment, based on the rotation angle command, a rotation angle value at a start of the segment and a rotation angle value at an end of the segment and generating an angular velocity pattern for each segment, correcting the translational velocity pattern to reduce a rotation amount of the rotation command given by the angular velocity pattern and generating a corrected translational velocity pattern, and driving and controlling, based on a resultant velocity vector based on the corrected translational velocity pattern, the translation movement mechanism and simultaneously driving and controlling, based on an angular velocity command based on the angular velocity pattern, the rotary drive mechanism.