Liquid metal heating and casting ladle

Details Liquid metal heating and casting ladle Liquid metal heating and casting ladle

1997-07-09

1999-03-16

Kastler, Scott

Metallurgical apparatus

Means for melting or vaporizing metal or treating liquefied...

Heated melting pot

266231, B22D 4101

Patent

active

058825827

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention concerns a furnace or heating ladle for holding of liquid metals, in particular metals having a high melting point, such as cast irons, steels, or superalloys.
In particular, the invention relates to ladles of the type comprising a main element incorporating a cavity delimited by a heat-resistant lining and intended to be filled with molten metal, this cavity being fitted with a filling opening and a metal-outlet orifice connecting with said cavity, and metal-heating means. The cavity is intended to be filled with molten metal whose temperature is kept constant.
Conventional practice entails keeping liquid metal at constant temperature by using an electric tunnel furnace (see, for example, U.S. Pat. No. 3,810,564).
In this type of furnace, the holding the metal at constant temperature is effected by circulating the metal in a duct heated by an inductor. It is difficult to implement this technique when dealing with metals which require high holding temperatures, such as steels and superalloys. When in use, this type of furnace exhibits problems relating to the strength of the heat-resistant material composing the tunnel.
With some alloys such as treated cast irons, malfunctions occur, in particular those caused by substance build-up.
Furthermore, in tunnel furnaces, the quantities of refractory are significant, thereby mandating that a heel or the furnace be left continuously at constant temperature; accordingly, the use of the tunnel furnace is limited to a small number of applications not requiring a high degree of flexibility of use. For example, it is difficult to change alloys frequently or to shut down the furnace face every day.


SUMMARY OF THE INVENTION

Given this state of the art, the invtention proposes to furnish a furnace or heating ladle designed to hold liquid metal and to solve all of the problems mentioned above. In particular, the invention is intended to supply a heating ladle whose design facilitates the flow of liquid metal, especially during liquid metal-drawing operations and all subsequent measuring, cleaning, and maintenance operations.
To this end, the invention concerns a ladle of the aforementioned type, characterized by the fact that said cavity incorporates a heel zone and a reserve zone, the volume of the heel zone is less than the volume of reserve zone, and the heel zone is located in the lower portion of a main cylinder having axis Y--Y which slopes at an angle of approximately 30.degree. in the functional position of the ladle, the shape of said cavity incorporating no dead angle, thereby producing an even flow of the liquid metal and allowing access, through said filling opening, to each point of the cavity, in particular for the purpose of heat-cleaning the casting ladle.
In accordance with other features of the casting ladle: and the liquid metal reserve zone connecting with this cylinder, the feed cylinder, and the outlet orifice; cylinder having its axis displaced upward in relation to the axis of the main cylinder; cylinder, so as to constitute the liquid metal reserve zone, said reserve zone being connected to the feed cylinder by a connection zone substantially truncated in shape and fitted with rounded segments; the filling opening at an angle of approximately 30.degree. in the functional position of the ladle, in order to ensure that the ladle can hold a large quantity of liquid metal, while minimizing the heel.
The filling opening comprises a sealing device intended to limit heat losses from the metal and/or to render the metal surface inert. heating area having the same axis and preferably the same diameter as the feed cylinder, and they are mounted removably on the main element.


BRIEF DESCRIPTION OF THE INVENTION

The features and advantages of the invention will emerge from the following description, which is provided as an example in conjunction with the attached drawing, which represents a diagram in vertical cross-section of the equipment incorporating the constant temperature holding ladle according to

REFERENCES:
patent: 3790145 (1974-02-01), Gering
patent: 3918692 (1975-11-01), Oberg
patent: 4638980 (1987-01-01), Beele

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