Laser Cutting Head Path Compensation for Sheet Metal Strip
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Solution Overview
Problem
Existing methods for cutting sheet metal blanks from continuously conveyed metal strips suffer from speed fluctuations due to variations in strip thickness and surface conditions, leading to inaccurate cuts and the need for reworking or discarding defective blanks.
Innovation Solution
A method involving a laser cutting apparatus with a control program that continuously measures the metal strip's path and calculates the cutting path in real-time, allowing the laser cutting head to adjust its movement to compensate for speed fluctuations, eliminating the need for pressure roller pairs and ensuring accurate contour cuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pressure roller pairs are used to hold the metal strip in a tensioned manner, then the metal strip can be conveyed continuously, but speed fluctuations occur due to variations in strip thickness and surface condition
Solution Approach 1:
The patent implements a feedback mechanism by continuously measuring the actual path of the metal strip with a path measurement device and using this information to dynamically recalculate the cutting path. The control device receives measured path values and adjusts the cutting path calculations in real-time to compensate for speed fluctuations, thereby maintaining cutting accuracy without requiring tensioning rollers that cause instability
Solution Approach 2:
The patent replaces the mechanical tensioning system (pressure roller pairs) with a control-based solution. Instead of mechanically forcing the strip to maintain constant speed through friction and tension, the system uses optical/path measurement devices and computational recalculation to adapt to the strip's actual movement, substituting mechanical control with measurement and information processing
2Stability of the object's composition
If the second pressure roller pair is driven at a higher speed than the conveyor belt to generate tension, then the metal strip is held in a tensioned manner, but unpredictable breaks of frictional connection occur
Solution Approach 1:
The patent eliminates the mechanical friction-based tensioning system entirely. Instead of using pressure roller pairs that rely on frictional connections prone to breaking, the system uses non-contact path measurement (optical or other non-mechanical sensing) and computational compensation to maintain cutting accuracy without mechanical tensioning
Solution Approach 2:
The patent introduces a path measurement device as an intermediary between the metal strip and the cutting system. This device continuously monitors the strip's actual position and path, providing information that allows the control system to adapt to speed variations without requiring direct mechanical contact or friction-based tensioning
3Device complexity
If a predetermined cutting path is used without real-time adjustment, then the cutting process is simple, but the sheet metal blanks do not have the predetermined contour due to speed fluctuations
Solution Approach 1:
The patent transforms the static, predetermined cutting path into a dynamic, adaptive cutting path. The control device continuously recalculates the cutting path based on real-time measured path values, making the cutting system dynamic and responsive to actual strip movement conditions, thereby maintaining contour accuracy despite speed variations
Solution Approach 2:
The system implements closed-loop feedback by continuously measuring the metal strip's actual path and using this information to adjust the cutting path calculations. The control device receives feedback from the path measurement device and dynamically modifies the cutting trajectory to compensate for speed fluctuations, ensuring accurate contour cutting
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 produces sheet metal blanks with improved accuracy and is insensitive to quality fluctuations, enabling faster and more reliable production of predetermined contours with reduced rework and waste.
Implementation Method 1
at least one laser cutting apparatus having at least one laser cutting head that can be moved both in the x-direction and in a y-direction
Data Source
AI summary
The invention relates to a method for cutting a sheet metal blank having a predetermined contour from a metal strip that is continuously conveyed in a transport direction (x). The method includes the following steps of providing at least one laser cutting apparatus having at least one laser cutting head that can be moved both in the transport direction and in a y-direction extending perpendicularly thereto, and a control device for controlling a movement of the laser cutting head in accordance with a control program generating the predetermined contour; continuously measuring a path (ΔXstrip) of the metal strip in relation to the transport direction by means of a path measurement device provided upstream of the laser cutting apparatus; and dynamically calculating the movements of the at least one laser cutting head by means of the control program with use of the measured path values provided by the path measuring device.