Industrial Machine Path Control for Forward-Reverse Accuracy
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Solution Overview
Problem
Existing control systems for industrial machines fail to adequately address deviations between actual forward and reverse paths, particularly on non-linear paths with high instructed speeds, leading to inefficiencies and inaccuracies in machining processes.
Innovation Solution
A control apparatus that utilizes a machine model to predict actual paths, generate instructed reverse paths, and adjust speeds to minimize deviations by incorporating an instructed speed adjustment unit to correct for transfer characteristics of the machine, ensuring alignment between actual and instructed paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the instructed speed is increased to improve machining efficiency, then productivity increases, but the actual path deviates more from the instructed path at non-linear sections, worsening manufacturing precision
Solution Approach 1:
The system performs preliminary actions by predicting the actual forward path using a machine model before generating the reverse path instructions. This prediction allows the system to pre-compensate for deviations that will occur during high-speed movement, ensuring that when the machine reverses direction, the corrected reverse path accounts for the anticipated trajectory errors, thus maintaining precision even at higher speeds
Solution Approach 2:
The system changes parameters by adjusting the reverse path instructions based on predicted actual forward path deviations. The instructed reverse path generation unit modifies the reverse movement parameters (position, speed, timing) to compensate for the detected forward path deviations, allowing the system to maintain manufacturing precision while operating at higher speeds that improve productivity
2Productivity
If the instructed speed is increased, then productivity improves, but the deviation between actual forward path and actual reverse path increases, worsening manufacturing precision
Solution Approach 1:
The system implements feedback by using the machine model to predict the actual forward path based on the instructed forward path and instructed speed. This predicted actual path serves as feedback information that is then used to generate corrected reverse path instructions, creating a closed-loop control system that compensates for speed-induced deviations and maintains path consistency between forward and reverse movements
Solution Approach 2:
The system performs preliminary compensation by predicting path deviations before executing the reverse movement. The actual forward path prediction unit and instructed reverse path generation unit work together to pre-calculate the necessary corrections to the reverse path, ensuring that even at high speeds, the actual reverse path aligns with the intended trajectory, thereby maintaining manufacturing precision
Data Source
AI summary
A control device is provided with an instructed path generation unit that generates an instructed path for a movement path of a moving part on the basis of an instruction of a program, an actual forward path prediction unit that predicts an actual forward path from the instructed path using a machine model relating to a transfer characteristic of an industrial machine, an instructed reverse path generation unit that generates an instructed reverse path by reversing the movement direction of an actual forward path, an actual reverse path prediction unit that predicts an actual reverse path from the instructed reverse path using the machine model, and an instructed speed adjustment unit that adjusts an instructed speed based on a movement speed indicated by the instruction of the program so as to reduce an error of the actual reverse path relative to the instructed reverse path, and generates an instructed reverse speed.