Selective Absorption Heating for Aluminum Workpiece Deformability
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Solution Overview
Problem
Existing methods for increasing the plastic deformability of metal workpieces, such as aluminum sheets, often require uniform heating, which can be inefficient and may damage the surface, and do not allow for targeted heating of specific areas to achieve faster and more intense heating without adverse effects on the workpiece surface.
Innovation Solution
A method using an absorbent material with high radiation absorption properties, such as graphite, is applied selectively to specific areas of the workpiece, allowing for faster and more intense heating of those areas compared to non-coated regions, with the absorbent transferring thermal energy to the underlying surface, enabling precise temperature control and adaptability for subsequent forming processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If uniform heating is applied to the entire workpiece, then the plastic deformability is increased, but the heating time is extended and energy consumption increases
Solution Approach 1:
The patent applies local quality by selectively heating only the regions of the workpiece that require increased plastic deformability, rather than heating the entire workpiece uniformly. This is achieved through localized application of heating means to specific areas, thereby reducing overall heating time and energy consumption while still achieving the necessary deformability in critical zones.
Solution Approach 2:
The patent segments the heating process by dividing the workpiece into regions that require heating and regions that do not. The heating means are applied selectively to specific segments or areas of the workpiece, allowing for differentiated treatment that optimizes both time and energy efficiency based on the specific forming requirements of each region.
2Speed
If contact heating with a heated element is used to increase heating intensity, then heating speed improves, but the workpiece surface quality deteriorates
Solution Approach 1:
The patent introduces an intermediary medium between the heating source and the workpiece surface. This intermediary allows for intense heating to be transferred to the workpiece without direct contact between the heated element and the workpiece surface, thereby maintaining high heating speeds while preventing surface damage, discoloration, or other quality deterioration.
Solution Approach 2:
The patent replaces direct mechanical contact heating with a non-contact or indirect heating method. Instead of using a heated element that physically contacts the workpiece, the invention uses an intermediary mechanism to transfer thermal energy, eliminating the mechanical contact that causes surface damage while maintaining effective heating speed.
3Productivity
If selective heating of specific areas is implemented, then the ratio between heating time and achievable temperature improves, but the device complexity increases
Solution Approach 1:
The patent achieves selective heating by making the heating means universally applicable to different regions of the workpiece. The same heating device can be selectively applied to different areas as needed, rather than requiring separate specialized heating systems for each region. This multi-functional approach maintains heating efficiency while limiting the increase in device complexity.
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 absorbent material heats up quickly and transfers heat to the workpiece, achieving higher temperatures in coated areas faster, allowing for flexible deformability adjustments during forming processes, with the ability to remove the absorbent post-heating to prepare the workpiece for further production steps without surface damage.
Implementation Method 1
Due to the higher absorption coefficient of the absorbent, a greater proportion of the incident radiation energy is absorbed by the absorbent than by the surface of the workpiece where no absorbent is present.
Implementation Method 2
The comparatively heated absorbent then conducts the absorbed heat energy to the underlying surface of the workpiece covered by the absorbent
Data Source
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AI summary
The invention relates to a method for at least locally increasing the plastic deformability of a metal workpiece (5), which has an aluminum alloy in particular. The workpiece (5) is supplied with a radiation in order to increase the temperature of the workpiece. The invention also relates to a corresponding manufacturing device. The aim of the invention is to allow a higher and faster heating of specific regions of a metal workpiece in a controlled manner compared to other regions, wherein a higher and faster heating is to be achieved using the same radiation power while the surface of the workpiece is to be influenced as little as possible. This is achieved in that an absorption agent (10) is applied at least locally onto the workpiece (5) prior to supplying the workpiece (5) with the radiation. The degree of absorption of the absorption agent (10) for the radiation is higher than the degree of absorption of the workpiece (5) for the radiation.