Water Jet Cutting Speed Control at Intersection Points
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Solution Overview
Problem
Water jet cutting methods for brittle materials, such as glass epoxy, often result in insufficient processing areas and damage when intersecting cut lines due to high travel speeds causing delay-inclination and water jet escape, leading to projections and damage at the intersection points.
Innovation Solution
A water jet processing method that adjusts the relative travel speed of the nozzle, reducing the speed before intersecting cut lines to minimize delay-inclination and prevent water jet escape, ensuring precise cutting by maintaining a lower speed until the second cut line traverses the first cut line, thereby eliminating projections and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the nozzle travels at high speed to increase productivity, then productivity is improved, but delay-inclination occurs causing insufficient processing area and projections
Solution Approach 1:
The patent applies dynamics by making the nozzle travel speed variable rather than constant. The speed is dynamically adjusted based on the real-time position of the nozzle relative to intersection points of cut lines. When approaching an intersection, the speed is reduced to prevent delay-inclination; when away from intersections, the speed returns to normal to maintain productivity. This dynamic speed control resolves the contradiction between high-speed cutting and cut quality at intersections.
Solution Approach 2:
The patent changes the parameter of nozzle travel speed according to the spatial position and processing stage. By modifying the speed parameter in response to the nozzle's proximity to intersection points and the current cutting phase (before, during, or after intersection), the system prevents delay-inclination and projections while maintaining overall high productivity. This parameter change strategy directly addresses the contradiction between speed and precision.
2Loss of time
If the nozzle travels at high speed, then processing time is reduced, but water jet escapes at intersections causing damage to the workpiece
Solution Approach 1:
The patent uses dynamic speed adjustment to control water jet behavior at intersections. By reducing speed when approaching and during intersection processing, the water jet maintains stable direction and prevents escape that would cause damage. After intersection, speed is restored to normal. This dynamic control eliminates damage while minimizing additional processing time.
Solution Approach 2:
The patent applies preliminary anti-action by reducing nozzle speed before reaching the intersection point. This preventive speed reduction occurs in advance to stop the water jet from escaping and damaging the workpiece at the intersection, thereby preventing harmful effects before they occur.
3Productivity
If the second cut line intersects the first cut line at high speed, then productivity is improved, but projections are formed narrowing the cut line
Solution Approach 1:
The patent applies dynamics by adjusting the nozzle speed dynamically during the cutting process. When the nozzle approaches and processes the intersection with the first cut line, the speed is reduced to prevent projection formation that would narrow the cut line. After successfully traversing the intersection, the speed is restored to maintain productivity. This dynamic speed control ensures proper cut line geometry while minimizing impact on overall productivity.
Solution Approach 2:
The patent changes the nozzle travel speed parameter based on the spatial position relative to intersections and the current cutting phase. By modifying this parameter in real-time, the system prevents projection formation and maintains proper cut line geometry at intersections while preserving high-speed cutting capabilities in non-critical areas.
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
This method effectively prevents abnormal processing and damage at intersection points, ensuring satisfactory products by reducing the size of projections and maintaining a clean cut surface, even at higher nozzle speeds.
Implementation Method 1
a jet of high-pressure processing water directed to the workpiece
Data Source
AI summary
In a water jet processing method, when a nozzle adapted to emit water jet is moved relatively to a substrate to form a second cut line intersecting a first cut line, the relative travel speed of the nozzle is set to a second speed lower than a first normal speed by about 1/5 to 1/20 at least in a section anteroposterior to the intersection. Delay-inclination of a front edge of the second cut line is eliminated as much as possible to thereby prevent the occurrence of an insufficient processing area.