Numerical Controller Corner Path Optimization
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Solution Overview
Problem
Conventional numerical control methods fail to effectively optimize corner paths with continuous tangential direction, resulting in insufficient inward turning amount and prolonged cycle times, especially when the tangential direction of the corner path is continuous.
Innovation Solution
A numerical controller with a path conversion unit that generates a curved correction path by shifting the intermediate point of the command path inward within a preset tolerance, replacing the command path of the third block with a correction path, and inserting curves between blocks to achieve a sufficient inward turning amount, thereby optimizing the corner path at corners with continuous tangential direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a curve is inserted into a block junction to control shock, then the cycle time may be shortened, but the inward turning amount is restricted when the tangential direction is continuous, resulting in insufficient optimization
Solution Approach 1:
The patent applies preliminary action by detecting whether the tangential direction is continuous before inserting a curve into the block junction. When continuity is detected, the system performs additional preliminary calculations to determine the appropriate shift amount for the intermediate point, ensuring optimal inward turning is achieved before the curve insertion process begins. This preliminary detection and calculation enables the system to adaptively optimize the corner path for continuous tangential directions.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the shift amount based on the detected tangential continuity. When continuity is detected, the system calculates a specific shift amount using the formula involving the maximum inward turning amount and allowable error, and applies this parameter change to the intermediate point position. This parameter adjustment enables sufficient inward turning for continuous tangential paths while maintaining shock control benefits.
2Loss of time
If the tolerance is increased to allow greater inward turning, then the cycle time is shortened, but the inward turning amount remains restricted when tangential direction is continuous
Solution Approach 1:
The patent applies parameter changes by introducing a dynamic shift amount parameter that is calculated based on the allowable error and the maximum inward turning amount. When tangential continuity is detected, this shift amount parameter is applied to the intermediate point, effectively increasing the inward turning capability without simply increasing the overall tolerance. This parameter adjustment enables optimal corner path optimization while maintaining manufacturing precision within the designated tolerance.
3Object-affected harmful factors
If the curve insertion is applied universally to all block junctions, then shock is controlled, but the corner path optimization is insufficient for continuous tangential directions
Solution Approach 1:
The patent applies local quality by detecting the specific condition of each block junction (whether tangential direction is continuous or not) and applying different processing strategies accordingly. For continuous tangential directions, the system applies local optimization by shifting the intermediate point by a calculated amount before curve insertion. For discontinuous directions, the standard curve insertion is applied. This localized adaptation ensures optimal shock control and corner path optimization for each specific junction type.
Solution Approach 2:
The patent applies preliminary action by performing tangential continuity detection and shift amount calculation before the curve insertion process. This preliminary analysis allows the system to prepare the optimal intermediate point position in advance, ensuring that when the curve is inserted, the maximum inward turning is achieved for continuous tangential paths. This preliminary preparation enables both shock control and optimal corner path optimization.
Data Source
AI summary
A numerical controller includes a path conversion unit for obtaining a curved correction path passing through three points corresponding to a start point and an end point of a third block, and a shift point obtained by shifting an intermediate point of a command path based on the third block in an inward direction of a corner path within a limit of a preset allowable error amount when the corner path is formed by a series of blocks and a tangential direction of the corner path is continuous, and generating a path obtained by replacing the command path of the third block included in the corner path by the correction path, the third block commanding curvilinear movement at a larger curvature than a first curvature and a second curvature being interposed between the first block.