Numerical Controller Path Smoothing for Crease-Free Machining
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Solution Overview
Problem
Conventional machining methods experience deviations in smoothing results due to discontinuous changes in the range of application of smoothing, leading to creases on machined workpieces when dealing with routes of gradually changing shapes.
Innovation Solution
A numerical controller that expresses the machining route as a parametric line segment or curve and sets a range of smoothing that changes continuously, ensuring a deviation threshold is maintained, using techniques like conversion into spline curves or moving average filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same range of application of smoothing is set throughout the entire route, then the smoothing process is simple, but a large deviation from the original route occurs in high curvature areas and a small deviation in flat areas
Solution Approach 1:
The patent applies dynamics by making the smoothing range variable rather than fixed. The smoothing range is dynamically adjusted based on the local curvature characteristics of the tool route, allowing the system to adapt to different geometric conditions along the path. This resolves the contradiction by enabling precision control in high curvature areas while maintaining simplicity in flat areas.
Solution Approach 2:
The patent changes the parameter of smoothing range based on local route characteristics. By calculating curvature at different points and adjusting the smoothing range accordingly, the system achieves appropriate deviation control for each section of the tool route. This parameter adaptation resolves the contradiction between uniform simplicity and localized precision.
2Manufacturing precision
If the range of application of smoothing is changed on an as-needed basis to control deviation, then manufacturing precision is improved, but discontinuous change occurs between adjacent routes causing creases on the workpiece
Solution Approach 1:
The patent ensures continuity by making transitions in smoothing range gradual rather than abrupt. When moving from one route section to another, the smoothing range is adjusted incrementally based on changing curvature characteristics. This continuous adjustment prevents discontinuities that would otherwise manifest as creases on the workpiece surface.
Solution Approach 2:
The dynamic adjustment of smoothing range creates a smooth transition between different route sections. The system continuously monitors curvature changes and adapts the smoothing range accordingly, ensuring that adjacent routes are smoothed in a coordinated manner. This dynamic approach eliminates the harmful discontinuities while maintaining precision deviation control.
3Manufacturing precision
If smoothing is performed on adjacent routes with gradually changing shapes using different ranges of application, then deviation control is improved for each route, but discontinuous change in smoothing range creates steps between routes
Solution Approach 1:
The patent maintains continuous smoothing action across adjacent routes by coordinating the smoothing ranges. Instead of applying different ranges independently to each route, the system adjusts ranges in a coordinated fashion that ensures smooth transitions at route boundaries. This prevents the formation of steps while maintaining precision control on each individual route.
Solution Approach 2:
The patent changes smoothing parameters continuously across route boundaries rather than discontinuously. By calculating appropriate smoothing ranges for adjacent routes and ensuring their compatibility, the system eliminates shape discontinuities. The parameter transitions are designed to maintain geometric continuity while achieving precision deviation control.
Data Source
AI summary
To smoothen a machining route more appropriately. A numerical controller of the present invention comprises: a machining program look-ahead unit that acquires a program for machining; a command route mathematization unit that expresses a machining route as a parametric line segment or curve on the basis of the program for the machining; and a smoothing processing unit that sets a range of smoothing for a target point of the smoothing along the parametric line segment or curve in an optional range from the target point, and performs the smoothing on the target point on the basis of the set range of the smoothing. The range of the smoothing set by the smoothing processing unit is a range in which a deviation between before the smoothing and after the smoothing on the target point is a set threshold or less.