Hot-Formed Metal Marking for Readable High-Temperature Identification
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Solution Overview
Problem
Current methods for marking metallic workpieces, especially those subjected to hot forming, fail to provide machine-readable, temperature-resistant markings that maintain visibility and adhesion after deformation, leading to issues with batch identification and quality assurance in industries like automotive engineering.
Innovation Solution
A method involving the application of thermally stable markings, such as ceramic or phosphor-based materials, to metallic blanks before hot forming, which withstand high temperatures and maintain readability through differences in reflectance, allowing for component-specific identification and adherence of subsequent coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional marking methods are applied to metallic blanks before hot forming, then batch identification is possible, but the markings are destroyed or become unreadable after deformation and heating
Solution Approach 1:
The marking material's chemical composition is changed to be thermally stable and resistant to deformation. The patent uses ceramic-based or phosphor-based materials that maintain their structural integrity and optical properties at high temperatures (above 800°C) and during plastic deformation, unlike conventional organic inks that decompose or smear.
Solution Approach 2:
The marking consists of a composite structure with a thermally stable base material (ceramic or phosphor) that can withstand hot forming conditions. This composite material is applied as a paste or slurry containing refractory compounds that form a durable marking layer resistant to both thermal and mechanical stress.
2Temperature
If thermally stable marking materials are used to withstand hot forming temperatures, then temperature resistance is improved, but adhesion to the metal surface and visibility contrast become challenging
Solution Approach 1:
The marking material exhibits different reflectance properties compared to the metallic blank surface. The ceramic or phosphor-based marking has distinct optical characteristics (different albedo, reflectance, or emission properties) that create high contrast visibility under various lighting conditions, enabling reliable detection by machine vision systems or human inspectors.
Solution Approach 2:
A binder or carrier medium is used as an intermediary between the thermally stable marking particles (ceramic/phosphor) and the metal surface. This binder ensures proper adhesion during application and maintains the marking's attachment through the hot forming process, while the binder itself is designed to be thermally stable or to decompose in a controlled manner that preserves the marking.
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 enables machine-readable, temperature-resistant markings that remain intact during hot forming, ensuring component resolution and facilitating quality control, while maintaining adhesion and visibility even after deformation and subsequent coating applications.
Implementation Method 1
the marking is not destroyed by deforming and remains at the workpiece at least until after the process of deforming the blank
Implementation Method 2
the marking has a difference in the degree of reflection and/or a difference in the degree of reflectance and/or a difference in albedo of at least 15 percentage points or 25 percentage points or 50 percentage points at least in part of the near ultraviolet, visible and/or near infrared spectral range
Data Source
AI summary
In an embodiment, a workpiece includes a hot-formed metal body and a marking, wherein the marking comprises a phosphor and/or pigments which are at least partly arranged on the metal body and which exhibit a reflection behavior and/or a reflectance behavior and/or an albedo behavior deviating from the metal body.