CNC Tool Path Continuity Control for Surface Precision
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Solution Overview
Problem
Current CNC machining technologies face challenges in achieving high surface quality and precision due to limitations in path geometry continuity, leading to issues like rounding, overgrinding, and machine dynamics-related unevenness, which affect the quality of the cutting profile and surface precision.
Innovation Solution
A control method for numerically controlled machine tools that evaluates and selects path programs based on geometric quality criteria such as continuity, tangency continuity, and curvature continuity, ensuring optimal alignment with the workpiece's differential-geometric nature to minimize machine dynamics excitation and enhance surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional path programming is used for CNC machining, then productivity is maintained through standard milling strategies, but surface quality and precision deteriorate due to discontinuities in path geometry causing rounding, overgrinding, and machine dynamics excitation
Solution Approach 1:
The patent changes the geometric parameters of the tool path by evaluating multiple candidate paths and selecting those with superior geometric quality criteria (continuity, tangency continuity, curvature continuity). This transforms standard discontinuous paths into continuous paths with smooth transitions, directly improving surface quality while managing program complexity through automated evaluation
Solution Approach 2:
The patent implements a feedback mechanism where the path program is evaluated based on geometric quality criteria, and the evaluation results are used to select or generate improved paths. This closed-loop approach ensures that path discontinuities causing surface defects are identified and corrected, maintaining high precision while managing complexity through systematic evaluation
2Manufacturing precision
If standard milling paths are used, then processing speed is maintained, but machine dynamics are excited causing oscillations and uneven cutting profiles that reduce manufacturing precision
Solution Approach 1:
The patent performs preliminary evaluation and selection of optimal paths before actual machining. By pre-assessing path programs based on geometric quality criteria and selecting the best paths in advance, the system avoids machine dynamics excitation during machining, ensuring cutting profile quality without requiring additional processing time during production
Solution Approach 2:
The patent modifies path parameters to achieve G1 (tangency) and G2 (curvature) continuity, which smooths out abrupt changes that excite machine dynamics. This parameter optimization reduces oscillations and improves cutting profile quality while maintaining efficient processing speeds through automated path selection
3Manufacturing precision
If path programs with discontinuities are used, then programming simplicity is maintained, but geometric quality deteriorates leading to rounding and overgrinding of workpiece features
Solution Approach 1:
The patent employs feedback through automated evaluation of path programs against geometric quality criteria. The system assesses candidate paths, identifies those with discontinuities that cause geometric errors, and selects improved paths, thereby maintaining high geometric accuracy while managing the complexity of the evaluation system through systematic automation
Solution Approach 2:
The patent transforms path programs by changing their geometric parameters to achieve superior continuity (G1, G2). This parameter optimization eliminates rounding and overgrinding caused by discontinuities, improving geometric accuracy while the automated evaluation and selection process manages the complexity of the path generation system
Data Source
AI summary
In a control method for the movement of a tool with a machine tool, the machine tool involves a numerically controlled machine tool, in order to produce an arbitrary required surface of a workpiece by machining. A numeric path program is created which describes the machining of the workpiece with the tool at machining points and which controls the control device. The numeric path program produces a path with respect to the geometric nature of the surface of the workpiece to be machined, with the path including a plurality of sample points and individual paths, with each individual path connecting a pair of the sample points to each other. The numeric path program is evaluated and selected on the basis of a geometric quality criterion, with the geometric quality criterion having continuity as at least one criterion.