Fluid Cutting Kerf Compensation via Dynamic Path Modification
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Solution Overview
Problem
Fluid stream cutting systems face challenges in achieving accurate cuts due to Kerf angle and lag errors, particularly when cutting complex workpieces with varying thickness and double contours, leading to taper and deflection issues that affect cutting precision and finish.
Innovation Solution
A system and method that includes a compensation module to receive information on the contour path and velocity of the fluid stream, providing a modified path with Kerf compensation, using polynomial models and dynamic velocity adjustments to address Kerf width, angle, and lag errors, and a motion controller to position the fluid stream accurately across the workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the nozzle moves at high speed to improve productivity, then cutting speed increases, but Kerf lag and deflection errors worsen causing cutting accuracy to deteriorate
Solution Approach 1:
The system pre-calculates and applies Kerf compensation values before cutting begins. The compensation module receives the contour path and velocity information, then computes modified path coordinates that anticipate and counteract the lag and taper effects that will occur during high-speed cutting, allowing accurate cuts even at high productivity rates
Solution Approach 2:
The system uses feedback from the actual cutting velocity and position to dynamically adjust the Kerf compensation. The compensation module continuously receives velocity information and modifies the contour path in real-time based on the actual cutting conditions, correcting for lag and taper as they occur during the cutting process
2Manufacturing precision
If the nozzle is tilted to compensate for Kerf angle, then taper is reduced, but device complexity increases due to additional positioning requirements
Solution Approach 1:
The system replaces the mechanical solution of tilting the nozzle with a computational approach. Instead of physically adjusting the nozzle angle to compensate for taper, the compensation module calculates modified path coordinates that mathematically account for the expected taper, eliminating the need for complex mechanical tilting mechanisms while achieving the same compensation effect
3Productivity
If the fluid stream velocity is increased to improve productivity, then cutting efficiency improves, but Kerf width and lag errors increase worsening cutting precision
Solution Approach 1:
The system dynamically changes the Kerf compensation parameters based on the actual cutting velocity. The compensation module receives velocity information and adjusts the compensation values accordingly, using different compensation factors for different velocity ranges, allowing optimal precision to be maintained across the full range of productivity rates
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces Kerf errors, improving cutting accuracy and finish by dynamically compensating for taper and lag, enabling precise cutting of complex workpieces with varying thickness and double contours.
Implementation Method 1
force the fluid through an aperture or orifice so as to be discharged at a high velocity upon the material to be cut through an erosion process
Implementation Method 2
an abrasive is also introduced into the fluid stream and discharged with the fluid to improve the efficiency of the cutting action by enhancing the erosion process
Data Source
AI summary
A system and method for positioning a fluid stream for cutting a double contour workpiece includes a compensation module configured to receive information regarding a contour path in at least five degrees of freedom for cutting the double contour workpiece and a velocity of movement of the fluid stream during cutting and configured to provide as an output a modified contour path of said at least five degrees of freedom based on Kerf compensation errors. A motion controller is adapted to receive the modified contour path of said at least five degrees of freedom and the velocity and is configured to provide control signals. A positioner is configured to receive the control signals and position a fluid stream adjacent the workpiece accordingly.