Refractory Distributor Design for Steel Casting Erosion Control
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Solution Overview
Problem
Current steel casting distributors suffer from erosion and impurity inclusion due to high-speed molten metal impact, leading to defects in special steels, as they lack design features to mitigate erosion and oxidation at the intersection of radial ducts and chamber, resulting in trapped air and refractory material contamination.
Innovation Solution
A refractory distributor with a chamber of greater diameter than the vertical supply tube, featuring a central hollow vessel and radial outlet ducts connected through vertical passages, which reduces the speed of molten metal and prevents hydraulic jumps, acting as a filter to minimize erosion and oxidation by eliminating sharp edges and increasing the cross-sectional area to allow inclusions to rise back.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the distributor uses a traditional configuration with radial ducts intersecting the chamber, then the structure is simple, but sharp edges form at intersections causing erosion and impurity inclusion
Solution Approach 1:
The patent replaces sharp edges at duct intersections with curved surfaces. The radial ducts connect to the chamber through curved transitions rather than abrupt intersections, eliminating the sharp edges that cause erosion. This curvature principle maintains structural simplicity while removing the harmful geometric features.
Solution Approach 2:
The patent modifies the geometric parameters of the distributor chamber and ducts. By changing the angle and curvature parameters of the duct connections, the design eliminates sharp edges while maintaining manufacturing feasibility. The parameter optimization balances simplicity with erosion prevention.
2Productivity
If the molten metal flows at high speed through the distributor, then the casting productivity is high, but hydraulic jumps occur trapping air and causing oxidation
Solution Approach 1:
The curved surfaces in the distributor design guide the molten metal flow smoothly, preventing abrupt changes in flow direction that would cause hydraulic jumps. The curvature ensures continuous, laminar flow that avoids air entrapment while maintaining high casting speeds.
Solution Approach 2:
The patent converts the high kinetic energy of the molten metal, which would normally cause harmful hydraulic jumps, into a beneficial smooth flow pattern. The curved duct design channels this energy constructively, maintaining productivity while preventing oxidation.
3Productivity
If the vertical duct delivers molten metal at high speed to the distributor, then the casting process is efficient, but impact erosion damages the refractory surfaces
Solution Approach 1:
The distributor chamber acts as an intermediary between the vertical duct and the radial outlet ducts. It absorbs and redistributes the impact energy of the incoming molten metal, preventing direct erosion of the refractory surfaces while maintaining casting efficiency.
Solution Approach 2:
The curved transition surfaces in the distributor chamber dissipate the impact energy of the high-speed molten metal through gradual directional changes rather than abrupt impacts, protecting the refractory surfaces from erosion.
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 solution significantly reduces refractory erosion, minimizes impurity inclusion, and decreases air flow speed towards the mould, resulting in improved steel quality by controlling the molten metal's kinetic energy and preventing air oxidation, thus enhancing the casting process.
Implementation Method 1
the chamber of the distributor has a greater diameter than the vertical duct for supplying molten metal... reduces the speed of molten metal... controlling the molten metal's kinetic energy
Implementation Method 2
a series of radial outlet ducts on the side wall thereof, to which other respective tubes that conduct molten metal are connected... vertical passages that originate from the bottom of the chamber
Implementation Method 3
Due to the traditional configuration of this distributor, edges or weak points form at the intersection of the radial ducts with the chamber... which give rise to the erosion on the same... The solution significantly reduces refractory erosion... by eliminating sharp edges
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A refractory distributor for casting steel comprising a chamber (11) equipped with a central inlet opening (12) at the base thereof and a series of radial outlet ducts (16) on the side wall thereof. The chamber (11) has a larger diameter than the vertical duct (13) for supplying metal and is situated above the radial conduits (16), to which it is linked through vertical passages (18). The chamber (11) has a central hollow (14) at the bottom.