Ring Electrode Heating for Sheet Metal Plastic Joining
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Solution Overview
Problem
Existing electrical resistance heating processes for flat materials struggle to achieve even heating in a small, limited area while maintaining access to the heated zone for efficient joining of plastic components.
Innovation Solution
A ring-shaped electrode arrangement with multiple electrodes distributed around a central opening allows for even heating of a flat material by alternating electrode constellations and enabling direct access to the heated area for plastic component joining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrodes are placed close together to heat a small area, then heating precision is improved, but access to the heated area for joining plastic components deteriorates
Solution Approach 1:
The electrode system is segmented into multiple electrodes (at least three) arranged around a central opening, allowing selective activation of different electrode pairs to heat specific zones while maintaining access to the central area for plastic component joining
Solution Approach 2:
Different regions of the material receive different heating treatments through selective electrode pair activation, with the central area remaining accessible for joining operations while surrounding areas receive controlled heating
2Stability of the object's composition
If multiple electrode pairs are used to heat a limited area uniformly, then heating uniformity is improved, but device complexity deteriorates
Solution Approach 1:
The electrode arrangement uses an asymmetric configuration with at least three electrodes positioned around a central opening, enabling uniform heating through selective pairing while maintaining a relatively simple overall structure
Solution Approach 2:
The same electrode arrangement serves multiple functions: heating the material uniformly through different electrode pair combinations and providing access to the central area for plastic component joining operations
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 ensures uniform and controlled heating of the flat material, allowing for optimal joining temperatures and precise placement of plastic components, while preventing overheating and ensuring high-quality connections.
Implementation Method 1
an electric current can be introduced into the material via the first and second electrodes to heat the material
Data Source
Figure 1~2
AI summary
The invention relates to a method for electrically heating an electrically conductive, planar material (3), in particular sheet metal, by resistance, and for thermally directly joining a plastic component (4) to the heated, planar material (3), in which a first and a second electrode (11, 12) are spaced apart from each other with a free space (18) on a surface (31) of the planar material (3) and an electric current is introduced into the material (3) via the first and second electrodes (11, 12) to heat the material (3), characterized in that the planar material (3) is heated by further electrodes (13, 14, 15, 16), which are all distributed in an electrode arrangement (1) around the free space (18) and placed on one surface (31) of the planar material (3), wherein different electrode configurations of the at least three electrodes (11, 12, 13, 14, 15, 16,16) are alternately supplied with an electric current in pairs, and the plastic component (4) is brought onto the heated, planar material (3) via the free space (18) for direct thermal joining of this plastic component (4) to it. Furthermore, the invention relates to a device for electrical resistance heating of an electrically conductive, planar material (3), in particular sheet metal, in which a first and a second electrode (11, 12) are spaced apart from each other by a free space (18) for placement on a surface (31) of the planar material (3), and an electric current is introduced into the material (3) from a control and supply unit (2) via the first and second electrodes (11, 12) to heat the material, characterized in that further, electrically separated electrodes (13, 14, 15, 16) are arranged in an annular electrode arrangement (1) around the free space (18).and the free space (18) normal to the planar material (3) allows free access to the surface (31) of the planar material (3) in this area.