Magnetic Workpiece Encoding for Post-Treatment Identification
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Solution Overview
Problem
Existing methods for encoding plate-like workpieces, such as metal sheets, face issues where surface treatments like powder coating, grinding, or deburring damage or obscure the applied laser markings, making it difficult to track or identify the workpieces.
Innovation Solution
A method involving a radiation processing device that applies a magnetic layer to the workpiece, fuses it with the surface using radiation, and removes excess parts, creating a unique magnetic code that can be read later even after surface treatments, using ferromagnetic or paramagnetic particles to alter the remanence properties and generate a readable magnetic fingerprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a visible code is applied to the workpiece by laser marking, then the workpiece can be identified and tracked, but surface treatments like powder coating, grinding, and deburring damage or remove the marking
Solution Approach 1:
The magnetic layer is applied and fused to the workpiece surface before any surface treatments are performed. This preliminary encoding ensures the identification code is already in place and protected, allowing subsequent treatments like powder coating, grinding, and deburring to be conducted without compromising the marking's integrity or readability
Solution Approach 2:
The invention uses a composite structure consisting of a magnetic layer containing magnetic particles fused to the workpiece surface. This composite material approach creates a durable magnetic encoding that combines the advantages of magnetic particle properties with the workpiece surface, resulting in a marking that resists damage from surface treatments while maintaining identification reliability
2Reliability
If a magnetic code is produced by generating permanent microstructural changes in metallic components, then the code can be read with magnetic reading heads, but the method is limited to only a few magnetizable materials and requires complex reading heads
Solution Approach 1:
The magnetic properties are localized to specific areas of the workpiece surface where the magnetic layer has been fused. By creating local magnetic variations rather than requiring bulk magnetization of the entire component, the system enables code readability with simpler magnetic reading heads while expanding compatibility to non-magnetizable materials that can still support the magnetic layer
3Stability of the object's composition
If the magnetic layer is fused to the workpiece surface by radiation, then the code remains readable after surface treatments, but the encoding area must be precisely defined and excess magnetic layer removed
Solution Approach 1:
The encoding process is segmented into distinct steps: defining the encoding area, applying the magnetic layer, fusing it through radiation, and removing excess material. This segmentation allows each step to be optimized independently, with precise area definition ensuring code stability while systematic removal of excess layer manages manufacturing complexity
Solution Approach 2:
The magnetic layer acts as an intermediary between the radiation source and the workpiece surface. It absorbs and distributes the radiation energy to create controlled fusion, enabling precise encoding area definition while the subsequent removal of excess layer simplifies the overall manufacturing process by eliminating unwanted material
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 method allows for reliable tracking and identification of workpieces through a unique magnetic code that remains readable after surface treatments, using portable devices, and can be activated and read with a magnetic field, ensuring the code's longevity and inconspicuousness.
Implementation Method 1
As a result of the irradiation of the workpiece, the surface of the workpiece is melted in the encoding area. During re-solidification, the magnetic particles of the magnetic layer are absorbed in the molten area and firmly integrated.
Implementation Method 2
The code can be activated by temporarily exposing the encoded workpiece to a magnetic field, so that the magnetic moments are aligned at least in the encoding area. An external magnetic field near the encoding area can be created for this purpose.
Data Source
AI summary
A method for encoding a plate-like workpiece comprising: defining an encoding area; applying a magnetic layer to the surface of the workpiece; fusing parts of the magnetic layer to the surface of the workpiece by acting on the workpiece with radiation within the encoding area; cooling the workpiece; removing the non-fused parts of the magnetic layer. The method permits the workpieces to be trackable in a simple manner, irrespective of surface treatments that may possibly be carried out or are to be carried out later.