Relief-Cut Sheet Part Separation for Thermal Distortion Control
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Solution Overview
Problem
Existing methods for cutting closely nested workpiece parts from a plate-shaped workpiece often result in thermal overload, leading to stress, distortion, and self-burning, particularly when using thermal processing beams like lasers or flame cutting, which affects cutting quality and process reliability.
Innovation Solution
The method involves dividing workpiece parts into groups and making relief cuts along or between the outer contours of adjacent groups before cutting, reducing thermal conduction and stress propagation by creating gaps for heat to dissipate through the air, thereby limiting heat transfer and mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If closely nested workpiece parts are cut using thermal processing beam, then cutting efficiency is improved, but thermal overload occurs leading to distortion and self-burning
Solution Approach 1:
The workpiece parts are divided into multiple groups, and relief cuts are introduced to segment the continuous workpiece into discrete sections. This segmentation allows heat to be isolated to specific regions rather than propagating throughout the entire workpiece, enabling efficient cutting while preventing thermal overload and distortion.
Solution Approach 2:
Relief cuts are made before the main cutting operation to pre-establish thermal isolation zones. By creating these gaps in advance, the workpiece is prepared to withstand the thermal load during subsequent cutting operations, preventing distortion and self-burning while maintaining cutting efficiency.
2Temperature
If relief cuts are introduced to reduce thermal conduction, then heat transfer is reduced, but additional cutting steps are required
Solution Approach 1:
The relief cuts are integrated with the existing cutting contours by positioning them along the outer contours of workpiece parts. This merging approach allows the relief cuts to be executed as part of the normal cutting path without requiring separate additional cutting steps, thus reducing heat transfer while avoiding increased process complexity.
3Reliability
If workpiece parts are grouped and cut separately, then thermal stress propagation is reduced, but processing time increases
Solution Approach 1:
The workpiece is pre-divided into groups and relief cuts are pre-positioned to define the cutting sequences. This preliminary organization allows the cutting head to efficiently process each group separately with minimal repositioning, reducing thermal stress propagation while maintaining acceptable processing times through optimized path planning.
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 approach enhances cutting quality by reducing heat-induced distortions and self-burning, particularly in flame cutting mild steel, while maintaining process efficiency by integrating relief cuts with the existing cutting contours, thus improving the reliability of the cutting process.
Implementation Method 1
The heat introduced into the workpiece by the laser beam is distributed across the entire sheet by thermal conduction, heating it continuously.
Implementation Method 2
The resulting cut gaps impair heat transfer, as heat transfer now occurs in the air.
Implementation Method 3
The heat introduced into the workpiece by the laser beam is distributed across the entire sheet by thermal conduction
Implementation Method 4
in flame cutting with oxygen as the cutting gas, an overheated sheet can also lead to so-called self-burning, in which the oxidation reaction becomes excessive
Data Source
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AI summary
The invention relates to a method for separating and cutting a plurality of workpiece parts (11) from a plate-shaped workpiece using a machining beam, comprising the steps of: dividing the plurality of workpiece parts (11) into at least two groups (G1, G2, G3, G4), separating and cutting the workpiece parts (11) from the plate-shaped workpiece group (G1, G2, G3, G4) for group (G1, G2, G3, G4), wherein at least one relief cut (1f, 1x) is made into the plate-shaped workpiece (12) before the separating cut, and wherein either one or more relief cuts (1f, 1x) are made into the plate-shaped workpiece along those outer contours (21) of at least two adjacent workpiece parts (11) of one of the groups (G1, G2, G3, G4) that face an adjacent group (G1, G2, G3, G4).or at least one relief cut is made between mutually facing outer contours (21) of workpiece parts (11) of at least two adjacent groups (G1, G2, G3, G4) into the plate-shaped workpiece.