Casting Nozzle Bridging Segment for Stress Dispersion
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Solution Overview
Problem
Long nozzles used in continuous steel casting are prone to breaking at the air gap region, leading to uneven gas blowout and the risk of air infiltration and molten steel leakage, due to stress concentration and deformation.
Innovation Solution
A bridging segment is provided in the gas pool between the nozzle body and the metal casing to restrain the nozzle body radially, and heat-resistant particles are filled to disperse stress, preventing cracking and oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas pool is formed between the nozzle body and metal casing to prevent oxidation and leakage, then sealing performance is improved, but the nozzle body becomes prone to breaking due to stress concentration
Solution Approach 1:
The patent applies local quality by providing reinforcement structures (such as strengthening ribs or thicker wall sections) specifically in the gas pool region where stress concentration occurs, while maintaining the original thin-walled structure in other regions to minimize overall weight and material usage. This localized reinforcement prevents breaking in the critical area without compromising the overall design benefits.
2Weight of moving object
If the nozzle body is made thinner to reduce weight and material usage, then manufacturing cost and weight are reduced, but the nozzle becomes more susceptible to breaking in the gas pool region
Solution Approach 1:
The patent implements local quality by concentrating structural reinforcement only in the gas pool region where stress concentration occurs during gas blowing operations. The rest of the nozzle body maintains a thin-walled design to minimize weight and material consumption, achieving an optimal balance between weight reduction and breaking prevention.
3Adaptability or versatility
If detaching and re-attaching operations are performed frequently during ladle replacement, then adaptability to different ladles is improved, but the joint portion becomes damaged and gaps form
Solution Approach 1:
The patent applies preliminary action by performing protective measures before the damaging effects occur. Specifically, the reinforcement structures are pre-installed in the joint portion and gas pool area to prevent damage during subsequent detaching and re-attaching operations. This proactive approach maintains sealing reliability despite frequent assembly/disassembly cycles required for ladle replacement.
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 effectively suppresses breaking of the nozzle body, reduces oxidation, and prevents molten steel leakage, thereby improving the sealing performance and steel quality.
Implementation Method 1
a technique of blowing inert gas from the vicinity of an upper end of the long nozzle is employed
Implementation Method 2
heat-resistant particles are filled to disperse stress, preventing cracking and oxidation
Implementation Method 3
a long nozzle as a casting nozzle is commonly used... a nozzle body made of a refractory material
Data Source
Figure 1~2
Figure 3~6
Figure 7~10
AI summary
Disclosed is a casting nozzle intended to suppress or prevent breaking of a nozzle body thereof. The casting nozzle comprises: a nozzle body 3; a metal casing 4 disposed to surround an upper end of the nozzle body 3 to form a gas pool 2 between an outer peripheral surface of the upper end of the nozzle body 3 and an inner peripheral surface of the metal casing 4; and a bridging segment 1 provided in at least a part of the gas pool 2 to bridge between the outer peripheral surface of the upper end of the nozzle body 3 and the inner peripheral surface of the metal casing 4.