Direct Resistance Heating Electrode Positioning for Uniform Workpiece Temperature
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Solution Overview
Problem
Existing direct resistance heating methods struggle to uniformly heat workpieces with varying widths along the longitudinal direction, as they require complex electrode arrangements and increased installation costs, which reduce productivity and make temperature control difficult.
Innovation Solution
A direct resistance heating method where a first and second electrode are placed perpendicular to the center line of the heating target region on a plate-shaped workpiece, allowing for uniform current application by adjusting the electrode position based on resistance changes along the workpiece's width, ensuring consistent heat distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple pairs of electrodes are provided to heat workpieces with varying width, then uniform temperature distribution is achieved, but installation cost increases and productivity decreases
Solution Approach 1:
The workpiece is divided into multiple heating sections along its longitudinal direction, with each section having different width. For each section, a dedicated pair of electrodes is positioned to apply current specifically to that region. This segmentation allows uniform heating of varying width sections without requiring complex electrode arrangements across the entire workpiece, reducing overall system complexity while maintaining temperature uniformity.
Solution Approach 2:
Different pairs of electrodes are positioned at different locations along the workpiece to match the varying width profile. Each electrode pair is locally optimized for its specific heating zone, with the current density and electrode spacing adjusted according to the local width requirements. This local quality approach ensures uniform heating in each section while simplifying the overall electrode arrangement compared to a single complex electrode system.
2Manufacturing precision
If multiple pairs of electrodes are used for varying width workpieces, then uniform heating is achieved, but installation cost increases
Solution Approach 1:
The heating system is segmented into multiple independent electrode pairs, each handling a specific width section. This segmentation allows for modular installation where each electrode pair can be independently positioned and adjusted, reducing the overall installation cost compared to a single complex electrode system that would require precise coordination across the entire workpiece.
Solution Approach 2:
Each electrode pair is locally optimized for its specific heating zone with appropriate spacing and positioning based on the local workpiece width. This local optimization simplifies the installation process for each section while maintaining overall temperature uniformity, reducing the complexity and cost of installation compared to a uniform electrode arrangement across varying widths.
3Manufacturing precision
If multiple pairs of electrodes are provided, then uniform temperature distribution is achieved, but productivity is reduced
Solution Approach 1:
The workpiece is divided into multiple heating sections with dedicated electrode pairs for each section. This segmentation allows simultaneous heating of multiple sections along the workpiece length, as each electrode pair can operate independently. This parallel processing approach maintains temperature uniformity across varying width sections while improving overall productivity compared to sequential heating methods.
Solution Approach 2:
Each electrode pair is positioned to optimize current distribution for its specific local section, enabling efficient heating of that region. The local optimization of electrode spacing and positioning for each width section allows high heating efficiency in each zone while maintaining overall productivity, avoiding the need to wait for sequential heating of different sections.
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 method enables uniform heating of workpieces with varying widths by controlling the electric current distribution, reducing installation costs and improving productivity while maintaining consistent temperature control.
Implementation Method 1
a direct resistance heating (also called as a direct electric conduction heating) in which an electric current is applied directly to a workpiece to heat the workpiece
Implementation Method 2
an amount of heat generation is uniform over the entire steel plate because an electric current flows uniformly through the steel plate
Data Source
AI summary
A direct resistance heating method includes placing a first electrode and a second electrode on a plate-shaped workpiece such that the first electrode and the second electrode extend across the workpiece in a direction substantially perpendicular to a center line of a heating target region of the workpiece, the center line connecting a middle portion of one side of the heating target region and a middle portion of the other side of the heating target region; and moving at least one of the first electrode and the second electrode along the center line while applying electric current between the first electrode and the second electrode.