Self-Lubricating Nozzle Annulus for Continuous Casting
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Solution Overview
Problem
Conventional horizontal continuous casting devices face issues with ingot breakout and defective products due to excessive lubricating oil vaporization, leading to reaction products and carbide formation on the ingot surface, which affects casting quality.
Innovation Solution
A continuous casting device with a molten metal pouring nozzle featuring an annular member with self-lubricating properties on the mold-side end face, reducing the need for excessive lubricating oil and preventing adhesion and breakout by enhancing lubrication, particularly at the area where gas accumulation occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of lubricating oil is supplied to prevent burning, then the ingot surface quality improves, but excessive vaporized lubricating oil causes breakout and carbide formation
Solution Approach 1:
The invention applies local quality by providing lubrication specifically at the end face of the molten metal pouring nozzle where molten metal contacts and solidifies, rather than supplying lubricating oil throughout the entire mold. The annular member made of self-lubricating material (graphite or PTFE) is positioned only at the critical contact area, providing localized lubrication that prevents burning without causing excessive vaporization and carbide formation in the bulk metal.
Solution Approach 2:
The annular member acts as an intermediary substance between the molten metal and the nozzle end face. This self-lubricating material layer facilitates smooth passage of molten metal through the nozzle while preventing direct adhesion to the fire-resistant substance surface, thereby eliminating the need for large amounts of lubricating oil that would otherwise vaporize and cause harmful effects.
2Temperature
If fire-resistant substance is used for the molten metal pouring nozzle, then high temperature resistance is achieved, but self-lubrication is poor causing adhesion and breakout
Solution Approach 1:
The invention creates a composite structure by combining the fire-resistant substance (providing high temperature resistance) with a self-lubricating material such as graphite or PTFE (providing lubrication). The self-lubricating material is formed as an annular member on the end face of the nozzle, creating a functional composite that simultaneously achieves both high temperature resistance and effective lubrication, preventing adhesion and breakout.
3Reliability
If lubricating oil is supplied from the mold inner peripheral wall, then burning prevention is achieved, but lack of lubrication at the nozzle end face causes adhesion and deterioration of casting surface quality
Solution Approach 1:
The invention implements self-service by using a self-lubricating material for the annular member at the nozzle end face. This material inherently provides lubrication without requiring external supply of lubricating oil to that specific location. The self-lubricating property ensures smooth passage of molten metal and prevents adhesion automatically, complementing the lubricating oil supply from the mold wall and ensuring both burning prevention and high casting surface quality.
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 solution ensures stable, high-quality casting over a long period with reduced carbide formation, as the self-lubricating annular member allows smooth molten metal flow, minimizing adhesion and the amount of lubricating oil required.
Implementation Method 1
an annular member having self-lubricating property is arranged on a mold-side end face of the main body portion so as to surround the molten metal passage
Implementation Method 2
the molten metal M is slightly cooled by the end face of the molten metal pouring nozzle 50, and gas accumulation G is formed between the mold 40 and the molten metal M
Data Source
AI summary
A continuous casting device capable of giving lubricating property to a molten metal pouring nozzle without increasing lubricating oil and performing casting with high casting surface quality for a long period of time is provided. In a continuous casting device 1 in which a molten metal pouring nozzle 20 is arranged between a molten metal receiving portion 10 and a mold 40, the molten metal pouring nozzle 20 is equipped with a cylindrical main body portion 22 made of a fire-resistant substance and having a molten metal passage 21, and an annular member 30 having self-lubricating property is arranged on a mold-side end face 23 of the main body portion 22 so as to surround the molten metal passage 21.