Laser Cutting Workpiece Checks for Sheet Property Mismatch
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Solution Overview
Problem
Current laser cutting systems lack a method to verify if the correct workpiece is loaded, leading to potential misalignment between workpiece properties and cutting plans, resulting in waste production, especially in automated processes where incorrect loading can cause the production of parts with wrong sheet thickness or material properties.
Innovation Solution
A computer-implemented method using sensors to detect actual workpiece properties and compare them with target properties defined in the cutting plan, issuing a stop signal or adaptation signal to ensure the correct workpiece is loaded, thereby preventing incorrect cutting processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automation system loads workpiece without verification, then productivity is improved through continuous operation, but reliability deteriorates due to potential mismatch between workpiece properties and cutting plan
Solution Approach 1:
The system performs preliminary verification of workpiece properties (material type, thickness) using sensors before the cutting process begins. The control unit compares detected properties with required properties from the cutting plan in advance, preventing mismatches before they cause waste or production stops.
Solution Approach 2:
The system implements a feedback loop where sensors continuously detect workpiece properties and feed this information back to the control unit. The control unit then verifies whether the detected properties match the cutting plan requirements, automatically stopping the process or alerting operators when mismatches are detected.
2Reliability
If verification system is implemented, then reliability is improved by preventing wrong workpiece cutting, but device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The control unit serves multiple functions: it manages the cutting process, controls the automation system, and performs verification by comparing sensor data with cutting plan requirements. This multi-functionality reduces the need for separate dedicated verification hardware, thereby limiting complexity increase.
Solution Approach 2:
The system uses the existing automation system's workpiece handling infrastructure and integrates verification using the same control unit and available sensors. The verification process leverages existing system components rather than requiring entirely separate dedicated verification equipment.
3Device complexity
If manual loading is used, then device complexity is reduced, but productivity deteriorates due to inability to process large sets of workpieces automatically
Solution Approach 1:
The verification system provides feedback to operators when manual loading is used, alerting them to potential mismatches between loaded workpieces and cutting plans. This maintains simple manual loading operations while adding intelligent verification to prevent errors.
Solution Approach 2:
The control unit acts as an intermediary between the simple manual loading operation and the complex cutting process. It receives workpiece property data from sensors, compares it with cutting plan requirements, and coordinates the verification process without requiring complex automated loading mechanisms.
4Ease of operation
If workpiece properties are not verified, then ease of operation is improved by simplifying the loading process, but loss of substance increases due to trash production from incorrect cutting
Solution Approach 1:
The system performs preliminary verification of workpiece properties before cutting begins, detecting material type and thickness using sensors. This early detection prevents incorrect cutting operations that would generate waste, while requiring minimal additional operator effort beyond placing the workpiece on the loading table.
Solution Approach 2:
The verification system provides immediate feedback when workpiece properties do not match cutting plan requirements, automatically stopping the process or alerting operators. This prevents waste production from incorrect cutting while maintaining simple loading operations, as the system handles the verification and correction automatically.
Data Source
AI summary
The present invention relates to a checking tool and a method for checking whether a laser cutting machine is provided with a correct workpiece from a set of workpieces, comprising the method steps of:Detecting actual workpiece properties of a workpiece which is provided or is prepared to be provided to the laser cutting machine for cutting;Providing a set of cutting plans, wherein one cutting plan of the set of cutting plans is forwarded to a control unit of the laser cutting machine, wherein each cutting plan is associated to target workpiece properties;Comparing the detected actual workpiece properties with the target workpiece properties, and providing a comparison result, indicating whether the correct workpiece is provided according to the cutting plan;Depending on the comparison result: Issuing a stop signal to stop the cutting process or issuing an adaption signal to change the sequence in the set of cutting plans.