Sheet Sorting Handler Control for Transfer Board Wear Compensation
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Solution Overview
Problem
Existing metal sheet handling systems in laser cutting plants face challenges in accurately adjusting the gripping height of handlers to account for the variable and uneven wear of the transfer board grid, leading to potential gripping errors and the need for costly replacements or additional height detectors.
Innovation Solution
The control logic of the sorting machine is interfaced with the cutting center's control logic to utilize altitude data from the cutting head's distance sensor, creating a map of the metal sheet surface altitude and underlying grid wear, allowing handlers to adjust their position accurately and adapt to local wear patterns without additional sensors or premature grid replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gripping height of handlers is adjusted to account for variable grid wear, then gripping accuracy is improved, but the complexity of the control system increases
Solution Approach 1:
The control logic of the sorting machine receives altitude data from the cutting head's distance sensor, which continuously measures the actual position of the metal sheet surface. This feedback loop allows the system to automatically compensate for grid wear by comparing measured altitude variations against the planned gripping positions, adjusting handler heights dynamically without requiring additional sensors or complex manual calibration systems.
Solution Approach 2:
The cutting head's distance sensor serves as an intermediary element that indirectly provides information about grid wear and metal sheet position. Instead of installing dedicated height detectors on each handler, the system utilizes the existing distance sensor data from the cutting head, which already measures the metal sheet surface position during cutting operations. This intermediary approach avoids adding extra sensors while still achieving the needed height compensation.
2Measurement precision
If additional height detectors are installed on each handler, then gripping precision is improved, but equipment costs and complexity increase
Solution Approach 1:
The cutting head's distance sensor performs multiple functions: it measures the metal sheet surface position during cutting operations and simultaneously provides data for handler height compensation. By making this sensor multi-functional, the system eliminates the need for separate height detectors on each handler, reducing both equipment costs and system complexity while maintaining gripping precision.
Solution Approach 2:
The existing distance sensor system serves itself by providing dual functionality. The sensor data originally intended for cutting control is also utilized for handler positioning, allowing the system to self-compensate for grid wear without requiring additional dedicated measurement devices. This self-service approach reduces equipment redundancy and costs.
3Reliability
If the transfer board grid is replaced frequently to maintain uniform height, then gripping reliability is improved, but equipment downtime and costs increase
Solution Approach 1:
Instead of maintaining a static, uniformly heighted grid that requires frequent replacement, the system dynamically adapts to the actual varying heights caused by wear. The control logic continuously updates the planned gripping positions based on measured altitude variations, allowing the grid to operate effectively even with non-uniform wear patterns, thereby extending its service life without compromising gripping reliability.
Solution Approach 2:
The system changes the operational parameters by adjusting the planned gripping positions and handler heights based on measured altitude variations. Rather than requiring the grid to maintain a fixed height parameter, the system adapts the gripping parameters to match the actual grid condition, allowing continued reliable operation despite wear-induced height changes.
4Manufacturing precision
If the gripping members are lowered to contact the pieces, then drawing accuracy is improved, but the risk of gripping errors due to height variations increases
Solution Approach 1:
The control logic calculates and adjusts the planned gripping positions in advance, before the actual drawing operation occurs. By using altitude data from the distance sensor to pre-calculate compensations for grid wear and metal sheet thickness variations, the system ensures that handlers are positioned at the correct heights before attempting to grip the pieces, eliminating height-related gripping errors.
Solution Approach 2:
The system replaces mechanical height adjustment mechanisms with a control-based approach. Instead of physically adjusting each handler's height through mechanical means, the control logic computes the appropriate gripping positions based on altitude data, and the handlers automatically position themselves accordingly. This substitution of mechanical adjustment with intelligent control improves both accuracy and reliability.
Data Source
AI summary
A method and a cutting system for sheets includes a cutting center, a sorting apparatus with handlers for gripping pieces cut by the cutting center, and a transfer board, movable between the handler area and the inside of the cutting center, supporting the sheets. The cutting center includes a cutting head movably mounted above the transfer board with a distance detection sensor, detecting distance data with respect to a sheet on the transfer board. The cutting center and sorting apparatus have respective first and second control logics. A data interface unit lies between the first and second control logic, by which distance data from the distance detection sensor, are transferred. The second control logic has a processor defining, periodically during operation cycles, an altitude map based on the distance data detected in a number of positions, and controlling a gripping step of the handlers based on the altitude map.