Heated Control Pin for Molten Metal Casting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing metal casting process is complex and risky due to the need for pre-heating control pins in furnaces, which can lead to accidents during transfer, and existing control pin designs are cumbersome to manufacture and prone to thermal degradation.
Innovation Solution
A control pin design featuring a central core, intermediate refractory layer, and outer shell with a heating element wrapped around the core, allowing in-situ heating and efficient energy use, along with a thermocouple for temperature control, reduces manufacturing complexity and enhances durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the control pin is pre-heated in a furnace before operation, then the control pin reaches the desired temperature, but the process becomes complex and creates safety risks during transfer
Solution Approach 1:
The patent combines the heating function directly into the control pin by integrating a heating element within the pin structure itself. This eliminates the need for a separate furnace and manual transfer process, thereby reducing process complexity while maintaining the ability to achieve desired temperatures.
Solution Approach 2:
The control pin becomes self-heating through the integrated heating element, allowing it to reach the required temperature independently without external assistance. This self-service capability eliminates the complex furnace operation and safe transfer procedures.
2Temperature
If the control pin is pre-heated in a furnace before operation, then the control pin reaches the desired temperature, but safety risks increase during transfer
Solution Approach 1:
By merging the heating element into the control pin structure, the patent eliminates the separate heating step that requires manual transfer. The control pin can be heated in its final position, removing the safety risks associated with handling hot pins during transfer operations.
3Temperature
If a heating element is placed inside the inner cavity of the control pin, then the pin can be heated, but the heating process requires more energy and time
Solution Approach 1:
Instead of placing the heating element inside the cavity (internal heating), the patent inverts the approach by positioning the heating element externally against the control pin surface. This external heating configuration improves thermal contact efficiency and reduces energy consumption and heating time.
4Reliability
If multiple refractory materials are used in the control pin, then the pin withstands wear and high temperatures, but manufacturing becomes complex and thermal degradation occurs
Solution Approach 1:
The patent uses a composite structure consisting of a refractory ceramic material for the control pin body and a refractory cement coating on the surface. This composite approach provides both high-temperature resistance and wear protection while simplifying manufacturing compared to laminated composite ceramics.
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 control pin can be efficiently heated in situ, reducing safety risks and manufacturing complexity, while maintaining molten metal temperature, and achieving higher temperatures with less energy, thus simplifying the casting process and improving safety.
Implementation Method 1
a heating element surrounding the outer surface of the central core
Implementation Method 2
with a central cavity in which a thermocouple can be inserted
Data Source
Figure 1~1A
Figure 2~2B
Figure 3A~3C
AI summary
A control pin for controlling the flow of molten metal through a down spout in a casting process is provided. The control pin comprises a body having an elongated shape, a lower portion insertable in the down spout, and a terminal end, opposite the lower portion. The body includes a central core, preferably a hollow tube or a rod of alumina or mullite; a heating element disposed around the central core, and an intermediate layer surrounding the central core and encasing the heating element, the intermediate layer being made of a solidified ceramic putty. Finally, an outer shell, preferably made of 10 woven fiber reinforcing fabric in a matrix of ceramic, surrounds the intermediate layer.