Laser Irradiation Position Correction for Robot Motion Accuracy
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Solution Overview
Problem
Existing laser processing robot systems face challenges in achieving high accuracy due to motion accuracy issues, control delays, and the need for multiple measurement devices, which can lead to processing inaccuracies and reliability concerns.
Innovation Solution
A robot system with a movable section, a laser irradiation device having a variable mechanism, and a method that involves executing a first robot motion to measure actual positions, calculating deviations, storing this data, and using it to correct the laser irradiation position during a second robot motion, ensuring precise alignment and operation performance evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If real-time measurement and correction of robot position is implemented, then processing accuracy is improved, but control delay occurs and system complexity increases
Solution Approach 1:
The patent performs measurement of the robot's three-dimensional position and calculates deviation data in advance during a first robot motion, before the actual laser processing begins. This preliminary measurement and calculation eliminates control delay during the actual processing, as the correction data is already prepared and stored for immediate application during the second robot motion.
2Reliability
If multiple measurement devices are deployed for each system, then measurement reliability is improved, but system cost and complexity increase
Solution Approach 1:
The patent enables a single measurement device to serve multiple systems by allowing shared use of the measurement device across different laser processing systems. The deviation data obtained from one system can be stored and applied to correct laser irradiation positions in other systems, eliminating the need for each system to have its own dedicated measurement device while maintaining measurement reliability.
3Adaptability or versatility
If laser irradiation device is attached to robot for remote processing, then flexibility is improved, but motion accuracy requirements increase
Solution Approach 1:
The patent implements a feedback mechanism where the actual three-dimensional position of the laser irradiation device is measured and compared with the command position to calculate deviation data. This deviation data is then used to correct the laser irradiation position during actual processing, creating a closed-loop control system that compensates for robot motion inaccuracies and maintains high processing accuracy despite the flexibility of attaching the device to the robot.
Data Source
AI summary
A laser processing robot system and a laser processing method, by which the motion accuracy of a robot in the system can be improved and laser processing with high accuracy can be carried out. The robot system is configured to: execute a first robot motion for moving an laser irradiation device to a predetermined command position; measure an actual three-dimensional position of the irradiation device in the first robot motion; calculate a deviation between the command position and the measured actual three-dimensional position of the irradiation device in the first robot motion; store the calculated deviation as a time series of deviation data; and execute a second robot motion in which a robot motion similar to the first robot motion is executed while correcting the laser irradiation position so that the laser irradiation position coincides with a desired position, based on the stored deviation data.