Feedrate Calculation Using Compensation Ratio for Multi-Axis Machining
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Solution Overview
Problem
Current methods for calculating feedrate in multi-axis machining are inaccurate, leading to operator-dependent adjustments and inefficiencies, particularly in 5-axis point and flank machining styles, as they fail to accurately represent the relative speed between the tool and workpiece.
Innovation Solution
A method and system that determine the displacement of machine and feedrate control points to calculate a compensation ratio, which is applied to a desired feedrate, using computer-aided manufacturing software to accurately program the feedrate for multi-axis machining tools, specifically using the actual contact point or contact line as the feedrate control point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods of calculating feedrate based on tool center point or spindle face center point are used, then the calculation process is simple, but the accuracy of feedrate representation is insufficient
Solution Approach 1:
The patent introduces a compensation ratio as an intermediary element that bridges the gap between simple control point displacement and actual contact point speed. The compensation ratio is calculated based on the geometric relationship between control points and contact points, allowing accurate feedrate calculation without directly tracking complex contact point movements throughout the machining process
Solution Approach 2:
The patent replaces direct mechanical tracking of contact point displacement with a computational approach using compensation ratios derived from control point displacements. This substitution of mechanical measurement with mathematical calculation maintains accuracy while simplifying the implementation in CNC systems
2Manufacturing precision
If manual adjustment of feedrate command values is performed by operator, then the feedrate can be adjusted to achieve desired machining result, but the machining process efficiency is significantly reduced
Solution Approach 1:
The system performs self-service by automatically calculating accurate feedrates using the compensation ratio method, eliminating the need for operator intervention. The CNC system itself generates the corrected feedrate values based on geometric relationships, making the process both accurate and efficient without requiring operator skills or manual adjustments
Solution Approach 2:
The compensation ratio is pre-calculated based on the tool geometry and machining parameters before actual machining begins. This preliminary calculation allows the system to automatically apply accurate feedrate corrections during machining without real-time operator intervention, maintaining both precision and productivity
3Adaptability or versatility
If operator-dependent manual adjustment is used, then the feedrate can be customized for different machining conditions, but the process becomes highly operator-dependent and error-prone
Solution Approach 1:
The system automatically adapts feedrate parameters by calculating compensation ratios based on varying geometric parameters such as tool orientation, contact point location, and machining depth. These parameter changes are performed systematically by the CNC system rather than manually by operators, ensuring consistent and reliable adaptation to different machining conditions
Solution Approach 2:
The compensation ratio method provides a universal solution that works across different machining operations, tool types, and workpiece geometries. The same fundamental approach of calculating displacement ratios between control and contact points applies universally, eliminating operator-dependent variations and improving process consistency across diverse machining scenarios
Data Source
AI summary
Methods and systems for calculating a feedrate for programming a multi-axis machining tool. For at least one control block in a defined machining path: a displacement of a defined machine control point from a previous control block to a current control block is determined; a displacement of a defined feedrate control point from the previous control block to the current control block is determined; a compensation ratio is calculated as a ratio between the displacement of the defined machine control point and the displacement of the defined feedrate control point; and a feedrate for the machine control point is calculated by applying the compensation ratio to a desired feedrate. The calculated federate is used in a control block of a multi-axis machining tool.