Melt Container Lance Spout Oxide Skin Management
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Solution Overview
Problem
Existing casting devices face issues with oxide skin formation at the melt surface, which contaminates the mold and reduces the longevity of the melt container by dirtying the spout, leading to reduced casting quality and increased maintenance.
Innovation Solution
A method involving a melt container with a lance spout that fills the melt receiving space with excess melt to prevent oxide skin formation, using immersion techniques, negative pressure, and gas valves to manage melt flow and prevent oxide skin adherence, ensuring the spout remains clean and functional.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the melt container is filled with excess melt to prevent oxide skin formation, then the quality of cast workpiece is improved, but the amount of melt required increases
Solution Approach 1:
The system is divided into two separate functions: the crucible holds the main melt supply, while the melt receiving space in the melt container receives only the necessary amount of melt for casting. This segmentation allows the oxide skin to form in the crucible rather than in the melt receiving space, enabling high-quality casting without requiring excessive melt.
Solution Approach 2:
The spout acts as an intermediary element that selectively transfers clean melt from the crucible to the melt receiving space while leaving the oxide skin behind in the crucible. The spout's positioning and design enable it to draw melt from below the oxide skin surface, effectively filtering out the contamination before it reaches the casting area.
2Ease of operation
If the spout is exposed to air during filling, then the filling process is simpler, but oxide skin forms and contaminates the spout
Solution Approach 1:
The system creates a protected environment for melt transfer by immersing the spout in the melt within the crucible, effectively eliminating contact with atmospheric oxygen during the critical filling phase. This prevents oxide skin formation on the spout surface while maintaining operational simplicity through the immersion filling mechanism.
3Productivity
If the lance is immersed deeply in the crucible, then melt flows easily by gravity, but the lance may become clogged with oxide skin
Solution Approach 1:
The spout is designed with specific local characteristics: its opening is positioned at a depth that optimizes both melt flow and oxide skin avoidance. The spout's geometry and positioning create a localized flow pattern where melt enters smoothly by gravity while the oxide skin remains at the surface, preventing clogging while maintaining high productivity.
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 prevents oxide skin from entering the mold, maintains the spout's cleanliness, and extends the device's operational life by ensuring better melt quality and reduced contamination, thereby improving casting efficiency and quality.
Implementation Method 1
the lance is immersed in a crucible filled with melt such that the spout orifice of the lance lies below the crucible fill level during the entire filling operation
Implementation Method 2
a negative pressure may be applied in the melt receiving space of the melt container, resulting in the melt being sucked into the melt receiving space by the crucible
Implementation Method 3
a remainder of melt having an oxide skin formed at the melt surface remains in the melt receiving space of the melt container
Data Source
AI summary
A method for casting a melt uses a melt container in which a melt receiving space is formed. The melt container has a spout in the form of a lance on the bottom on the melt container. The method includes the following steps: filling the melt container with melt, wherein the melt is introduced into the melt receiving space of the melt container from a crucible using a spout orifice of the lance; casting at least one cast workpiece with melt; filling the melt container with melt again. When filling the melt container with melt, more melt is received in the melt receiving space than is needed for casting the cast workpiece. Directly before the renewed filling of the melt container, a remainder of melt having an oxide skin formed at the melt surface is present in the melt receiving space of the melt container.