Mould-Integrated Shroud Lifting Mechanism for Casting
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Solution Overview
Problem
Conventional metal casting processes face challenges with air entrainment and oxidation, leading to defects such as air bubbles, oxide bifilms, and non-metallic inclusions, which affect the cleanliness, mechanical properties, and surface quality of castings. Additionally, these processes are hazardous and inefficient due to the need for precise ladle maneuvering and shroud attachment.
Innovation Solution
A casting system with a mould-integrated shroud and a lifting mechanism that allows the shroud to engage with the ladle nozzle, reducing re-oxidation and turbulence, and enabling quick and safe engagement/disengagement, thus improving casting efficiency and reducing the risk of ladle maneuvering hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional pouring basin is used to receive molten metal from the ladle, then the metal can be directed into the mould, but air is entrained into the metal stream causing bubbles and oxide bifilms
Solution Approach 1:
The invention removes the pouring basin from the casting system entirely. Instead of using a conventional pouring basin that entrains air, the ladle nozzle is positioned in direct contact with the downsprue entrance, allowing molten metal to flow directly into the mould without passing through an intermediate basin that would cause air entainment.
Solution Approach 2:
The invention merges the ladle nozzle positioning system with the mould alignment system. By integrating the ladle suspension mechanism with the mould positioning mechanism, the system achieves precise alignment between the ladle nozzle and downsprue entrance, eliminating the need for a separate pouring basin while maintaining accurate metal flow direction.
2Ease of operation
If the ladle is suspended from a crane for positioning over the mould, then the ladle can be moved to different positions, but it is difficult to precisely position the nozzle over the centre of the pouring basin or downsprue
Solution Approach 1:
The invention incorporates a feedback mechanism where the position of the mould is used to control the ladle position. The mould positioning mechanism provides real-time position information, and this feedback is used to adjust the ladle suspension mechanism to maintain precise alignment between the nozzle and downsprue entrance throughout the pouring process.
Solution Approach 2:
The invention introduces a positioning mechanism as an intermediary between the crane suspension system and the ladle nozzle. This intermediary mechanism includes adjustable components that can fine-tune the ladle position based on the mould location, enabling precise nozzle alignment while maintaining the flexibility of crane-based ladle movement.
3Productivity
If operators manually attach the shroud to the ladle nozzle, then the shroud can be positioned for metal flow control, but the process is hazardous and time-consuming
Solution Approach 1:
The invention makes the shroud attachment process self-service by integrating the shroud with the mould structure. The shroud is permanently attached to the mould and automatically positions itself relative to the ladle nozzle during the pouring process, eliminating the need for operators to manually attach the shroud to the hot ladle nozzle while the ladle is elevated.
Solution Approach 2:
The shroud is pre-positioned and secured to the mould structure before the ladle arrives. This preliminary action ensures that the shroud is already in the correct position and orientation, so when the ladle is lowered into place, the metal flow path is automatically established without requiring any manual attachment operations during the pouring process.
4Productivity
If a conventional gating system with ceramic tiles is used, then the metal can flow through the running system, but air is sucked into the metal through unsealed junctions causing oxidation
Solution Approach 1:
The invention merges the shroud structure with the downsprue and mould gating system. By integrating these components into a unified structure with sealed joints, the system eliminates the unsealed ceramic tile junctions that allow air suction, while maintaining efficient metal flow through the running system into the mould.
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 significantly reduces air entrapment and oxidation, resulting in improved casting surface finish, increased efficiency, and enhanced safety by eliminating the need for hazardous shroud attachment and allowing for optimized metal flow control.
Implementation Method 1
a lifting mechanism located on the upper surface of the mould, the lifting mechanism being operable to lift the funnel of the shroud away from the upper surface for bringing the shroud into engagement with a ladle nozzle
Implementation Method 2
The shroud also controls and reduces turbulence in the metal flow, which reduces the potential for air entrapment and abrasion of the mould
Implementation Method 3
The use of a shroud reduces re-oxidation of the metal on pouring between the ladle and the mould, thereby reducing the introduction of inclusions into the casting
Data Source
AI summary
Provided is a system for casting molten metals. The system includes a mould comprising a casting cavity having an inlet, and a bore between an upper surface of the mould and the inlet. The system further includes a shroud comprising a funnel and a hollow shaft, wherein the funnel is located outside of the mould, adjacent the upper surface, and the hollow shaft is received within the bore and is moveable therein. A lifting mechanism is located on the upper surface of the mould, the lifting mechanism being operable to lift the funnel of the shroud away from the upper surface for bringing the shroud into engagement with a ladle nozzle. Also provided is a method for casting molten metals using the system.