Tool Path Smoothing Control With Inward-Turn Compensation
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Solution Overview
Problem
Existing machining technologies face a challenge in maintaining machining accuracy while smoothing curved surfaces, as low-pass filters cause the tool path to shift inward, leading to reduced shape accuracy and insufficient smoothness when stringent tolerances are set.
Innovation Solution
A controller is designed with a low-pass filter unit, an inward turning amount calculation unit, and a smoothing processing unit that corrects the smoothing path by pulling it back in the opposite direction of the inward turn, ensuring the path remains closer to the original instruction points, thereby maintaining accuracy and smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If smoothing using a low-pass filter is applied to generate a smooth tool path, then the smoothness of the path is improved, but the machining accuracy (shape accuracy) deteriorates due to the path shifting inward from the instruction points
Solution Approach 1:
The patent applies preliminary anti-action by calculating the inward turning amount before machining and applying a correction in the opposite direction (outward correction) to the tool path. This pre-compensation ensures that the low-pass filter's inward shifting effect is counterbalanced, allowing the tool to accurately follow the intended instruction points while maintaining path smoothness.
2Manufacturing precision
If a stringent tolerance is set to suppress reduction in machining accuracy, then the machining accuracy is improved, but the smoothness of the path becomes insufficient
Solution Approach 1:
The patent changes the parameter of the tool path by introducing a correction amount based on the inward turning amount. This parameter modification allows the system to maintain both stringent tolerance requirements and path smoothness, as the correction compensates for the low-pass filter's inward shifting while preserving the smoothed characteristics of the path.
Data Source
AI summary
A control device according to the present disclosure includes a low-pass filter unit that generates a smoothed path by subjecting an indicated path, which is indicated by a control program, to smoothing by a low-pass filter; an inward turning amount calculation unit that calculates an inward turning amount that is the amount of inward turning of the smoothed path generated by the low-pass filter unit relative to the indicated path; and a smoothing processing unit that outputs a path obtained by turning back the smoothed path in a direction opposite to the inward turning direction on the basis of the inward turning amount.