Clay Graphite Billet Slider for Railless Induction Heating
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Solution Overview
Problem
Existing rail-based billet support systems in induction heating face issues with productivity and slider material longevity due to billet abrasion wear, leading to frequent replacements and inefficiencies in heating processes.
Innovation Solution
A railless billet electric induction heating system utilizing a clay graphite billet slider, which is electrically isolated from the induction coil and designed for sliding contact with the billet, allowing for efficient heat transfer and reduced wear through its unique composition and design features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional metal rails are used to support billets in induction coils, then billets can be moved through the coil, but the rails suffer from scale build up and require frequent maintenance
Solution Approach 1:
The patent employs composite refractory materials (such as alumina-silica-carbon composites) for billet support rails that combine high-temperature resistance, low friction properties, and durability. These composite materials resist scale buildup from hot billets while maintaining structural integrity, thereby extending rail service life and reducing maintenance frequency.
Solution Approach 2:
The patent utilizes consumable clay billets as temporary sliders that are discarded after single-use. These disposable clay sliders eliminate the need for maintaining expensive metal rails, as they are replaced after each heating cycle rather than being subject to wear and scale accumulation.
2Device complexity
If billets are allowed to rest directly on refractory within the induction coil, then the setup is simple, but productivity is reduced due to heat loss and inefficient heating
Solution Approach 1:
The patent introduces intermediate billet support rails made of refractory materials between the billets and the coil. These rails act as mediators that conduct heat more efficiently to the billets while preventing direct contact between billets and refractory, thereby improving heating rate without significantly increasing system complexity.
Solution Approach 2:
The patent divides the support system into segmented components (multiple rails positioned at different locations along the billet length) that can be independently optimized for heat conduction and support functions, improving overall heating efficiency while maintaining manageable system complexity.
3Temperature
If metal rails with forced fluid cooling are used, then rails can withstand high temperatures, but the system complexity and maintenance requirements increase
Solution Approach 1:
The patent replaces the mechanical forced fluid cooling system with passive refractory materials that inherently withstand high temperatures through their material properties. This substitution eliminates pumps, pipes, and cooling channels, dramatically reducing system complexity while maintaining temperature tolerance.
Solution Approach 2:
The patent changes the fundamental parameter of rail material from metal to refractory composite, which has inherently higher temperature tolerance without requiring active cooling. This material parameter change eliminates the need for complex cooling systems while maintaining thermal stability.
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 system achieves increased productivity with a longer lifespan for the billet slider material, resulting in improved energy efficiency and reduced maintenance needs, as evidenced by a 10% increase in productivity and energy savings compared to traditional rail systems.
Implementation Method 1
induction coil supplied with alternating current from a suitable power source
Implementation Method 2
inductively pre-heated to a high temperature
Implementation Method 3
Induction pre-heating of the billets
Implementation Method 4
Refractory is placed between the induction coil and billet to retain induced heat in the billet
Implementation Method 5
clay graphite billet slider...designed for sliding contact with the billet
Implementation Method 6
reduced wear through its unique composition and design features
Data Source
Figure 1(a)~1(d)
Figure 2(a)~2(b)
Figure 3(a)~4
AI summary
A railless billet electric induction heating apparatus and method is provided where billets are continuously or statically heated by induction by moving the billets without billet support rails through an induction coil supplied with alternating current power when the billets are in direct sliding contact with the interior surface of a clay graphite billet slider disposed within the induction coil. The clay graphite billet slider can also provide thermal insulation between the induction coil and the clay graphite billet slider to eliminate the requirement for a separate induction coil refractory.