Adaptive Laser Cutting Head for Variable Speed Contours
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Solution Overview
Problem
Conventional laser cutting systems face challenges in achieving uniform cut surfaces with high accuracy and efficiency, especially when cutting workpieces with complex contours and large changes in direction, due to the lack of an optimal set of process parameters that can be applied universally across different materials and shapes.
Innovation Solution
A laser cutting system that automatically adjusts process variables such as laser power, focusing optics, and gas pressure in real-time based on the current speed of the processing head, ensuring that the cutting path follows the specified cutting line within a minimum path accuracy, thereby optimizing the cutting process for variable cutting speeds and complex contours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the processing head moves at high speed to increase productivity, then cutting speed improves, but manufacturing precision deteriorates when cutting contours with large changes in direction
Solution Approach 1:
The patent applies dynamics by making the process parameters adaptive and variable during the cutting process. The control device continuously adjusts laser power, focus position, and gas pressure based on the instantaneous cutting speed, which varies dynamically along the contour. This allows the system to maintain high speeds while adapting parameters locally to preserve precision at direction changes.
Solution Approach 2:
The patent implements parameter changes by modifying multiple process parameters (laser power, focus position, gas pressure) in response to speed variations. When the processing head slows down at direction changes, the system adjusts these parameters to maintain cut quality, and restores them when speed increases, thereby resolving the contradiction between speed and precision.
2Device complexity
If a single set of process parameters is used for all cutting tasks, then device complexity is reduced, but adaptability deteriorates when handling different materials, thicknesses, and contour shapes
Solution Approach 1:
The patent applies self-service by enabling the control device to automatically determine and adjust optimal process parameters based on the contour geometry and cutting speed. The system uses registered contour data and speed information to self-regulate laser power, focus position, and gas pressure without requiring manual intervention or complex pre-programming for each material type.
Solution Approach 2:
The patent implements feedback by using the registered cutting speed as a basis for adjusting process parameters. The control device continuously monitors speed variations along the contour and uses this feedback to adaptively modify laser power, focus position, and gas pressure, thereby achieving high adaptability through a relatively simple control structure.
3Manufacturing precision
If the processing head speed is reduced at direction changes to improve path accuracy, then manufacturing precision improves, but productivity deteriorates due to increased total cutting time
Solution Approach 1:
The patent applies local quality by adjusting process parameters specifically at locations where direction changes occur, rather than uniformly across the entire contour. The control device identifies direction change points from the registered contour data and applies parameter modifications only in these localized areas, maintaining high speed elsewhere to preserve overall productivity.
Solution Approach 2:
The patent implements segmentation by dividing the cutting contour into segments with different speed and parameter requirements. Straight sections are cut at high speed with standard parameters, while direction change sections are processed at reduced speed with adjusted parameters, thereby optimizing both precision and efficiency through segmented processing.
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 system enables the production of uniform cutting surfaces with high efficiency and reduced user effort, capable of handling cutting lines with large changes in direction or multiple direction changes, ensuring high-quality cuts across various materials and shapes.
Implementation Method 1
a laser beam is focused on the surface of the workpiece and the workpiece is locally heated in such a way that the workpiece melts in the vicinity of the focus point of the laser beam
Implementation Method 2
one or more process gases are usually allowed to flow from nozzles directed towards the vicinity of the focal point of the laser beam under pressure onto the material melted by the action of the laser beam
Data Source
Figure 1
Figure 2~4
Figure 5a~5c
AI summary
A laser cutting assembly directs a beam along a cutting line at a varying speed. The assembly has a movable cutting head that directs the beam at the respective workpiece, a user control interface that specifies the cutting line and the minimum speed of advance of the laser beam, and a control unit that regulates the movement of the cutter head along the cutting line relative to the workpiece. The control interface further defines a number of process parameters. During the cutting process the movement of the cutter head forms a track along the cutting line.