JPH0395388A - Vacuum induction furnace - Google Patents

Abstract

PURPOSE: To reduce the size of an entire furnace, by constructing a cover to be rotatable with respect to a shell in a sealing manner, and providing each apparatus on the cover and disposing it just above a melting crucible. CONSTITUTION: A stool 19 supporting an inserted article is mounted under a cooling crucible 5 in an air tight manner with a gasket 22, and when a closed partition chamber is made vacuum with a gasket 4, an outer surface of the cover 3 receives atmospheric pressure which is supported with an annular support plate 15 of a shell 2 through a bearing 16. An inductor 6 is excited, and the inserted article is put in the crucible 5 from a supply chamber 10 while being melted, and melted metal temperature is measured with an apparatus 9. Further, a melted metal sample is collected with an apparatus 8, and an alloy additional matter is introduced into a proportional controller 7, and further gas and non-metal inclusions are removed from the melted metal surface in the crucible 5 with the aid of a plasma generator 11. After the inserted article is melted down into an ingot, and the inductor 6 is stopped, and vacuum in the furnace is released, and the stool 19 is derived from the crucible 5 to take out the ingot.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to metal melting furnaces, and more particularly to vacuum induction furnaces.

The present invention is applicable to melting refractory or reactive metals. The invention can also be used to remelt metal ingots to remove gases and non-metallic impurities, and to produce refractory and reactive metal-based high alloys.

[Conventional technology]

Vacuum induction furnaces having a closed compartment with a crucible contained within an inductor are known in the art (Book, B
"Vacuum Induction Melting" by V. Linchevsky, 1975 "Metalurgia" Publishing, Moscow, p. 147, Figure 77, USSR).

The compartment cover is provided with the necessary technical equipment to carry out and monitor the lysis process.

However, this type of furnace is characterized by a fixed working area, which prevents the use of a wide range of auxiliary technical equipment. This disadvantage arises from the fact that the technical device must be mounted above the surface of the molten metal in the crucible with its axis centered on the surface of the molten metal located deep within the crucible. If this requirement is not met, it is necessary to provide auxiliary devices such as troughs and chutes which require delicate operation of the furnace and increase the size of the cover.

Other currently known vacuum induction furnaces (SU,'A,10
32. 868) includes a cooled metal crucible, an inductor enclosing the metal crucible, a cooling stool disposed below the crucible, and a closed compartment secured above the crucible and communicating with the crucible. The compartment is equipped with technical equipment for carrying out and monitoring the metal melting process, with inspection holes and pipes for creating the processing atmosphere. The test hole is placed in the center of the compartment above the molten metal, while the pipe is supported on the side wall of the compartment. The arrangement of the compartment cover limits the number of technical equipment used and thus limits the throughput of the crucible, which can only be used for remelting the metal charge.

[Problem to be Solved by the Invention] The present invention provides that the structural arrangement of the cover of the closed compartment and the arrangement of technical equipment for carrying out and monitoring the metal melting process are suitable for carrying out and monitoring the metal melting process. Expanding the processing capacity of the furnace by using numerous technological devices of
The object is to provide a vacuum induction furnace that is constructed in such a way that the overall size of the furnace is significantly reduced by moving the device closer to the molten metal surface within the crucible.

[Means to solve the problem]

The above objects include a cooled metal crucible, an inductor surrounding the cooled metal crucible, a cooled stool installed at the bottom of the crucible, and a technology for communicating with the crucible and performing and monitoring the melting process. A vacuum induction furnace comprising a closed compartment comprising a shell having a cover provided with a device, according to the invention, the closed compartment comprising an actuating mechanism for rotation about its axis and said shell. A technical device for carrying out and monitoring said melting process is provided with a sealing gasket installed between the covers and a radius (r) equal to the respective interaxial distance of said crucible and cover. ).

The invention proposed here allows the overall size of the technical device to be reduced, providing reliable furnace operation and convenient service due to the placement of the technical device directly above the surface of the molten metal in the crucible. provide favorable conditions for

〔Example〕

The vacuum induction furnace includes a base 1 (
1). A closed, cooled metal crucible 5 is located below the base 1 and surrounded within an inductor 6.

Cover 3 is for carrying out and monitoring the metal melting process.
Device 8 for taking metal samples breaking the bridge of the proportional control device (Fig. 2), device 9 for measuring the metal temperature
, compartment 10 for the final addition of the charge, plasma generator 11
(FIG. 1), supports technical devices such as inspection holes 12. The cover 3 is provided with a starting mechanism 13 rotating around its axis.

Its base 1 is a plate that supports all the parts of the vacuum induction furnace and has holes 14 through which the cooled crucible 5 communicates with the closed compartment.

The shell 2 of the closed compartment has a cylindrical vibrator open from its tip, and an annular support plate 17 for providing a bearing 16 is provided on its inner wall. The closed compartment cover 3 is a cylindrical pipe opened from the bottom side, and an annular support plate 17 is provided on the outer surface of the closed compartment cover 3, which is attached between the walls of the shell 2 and the cover 3, and includes a gland and a collar cup. Alternatively, a sealing gasket 4 made in other shapes is provided. The cover 3 has a hole 18 provided for receiving the hermetically mounted technical equipment necessary to carry out and monitor the melting process.

The hole 18 is made in the cover 3 by placing it in a circumference having a radius r (FIG. 2) equal to the distance between the respective axes of the cooled crucible 5 and the cover 3.

A cooled stool 19 is provided at the bottom of the crucible.

The necessary atmosphere in the closed compartment of the vacuum induction furnace and in the crucible 5 is created via a pipe 20 fixed to the side wall of the shell 2. The crucible 5 has longitudinally disposed cooling members surrounding a vacuum-tight shell 21 made of an insulating material, such as glass reinforced plastic, which is insulated from each other and has no diametrical clearance. The shell is sealed by a gasket 22 provided on its end face.

The provided vacuum induction furnace operates as follows. A stool 19 (FIG. 1) supporting the charge is conveyed into the cooling crucible 5, which is sealed with a gasket 22.

The dilution required in the process is then created in a sealed compartment and the outer surface of the cover 3 is exposed to atmospheric pressure. This pressure is applied to the bearing 1 through the annular support plate 17 of the shell 2, which eliminates the frictional force generated between the annular support plates 15 and 17.
It will be relayed on 6th.

Furthermore, the inductor 6 is excited, and while the charge is melted into a metal ingot, the charge is further introduced into the Lupo 5 through the compartment 10 (Fig. 2), the temperature of the molten metal is measured by the device 9, and the melt A metal sample is taken by device 8, alloy additives are introduced through proportional control device 7 (Fig. 1), and gas and non-metallic inclusions are removed from the molten metal surface in crucible 5 using plasma generator 11. A large charge can be introduced while heating is being carried out, and the charge slipping device 8 can be used if necessary at a given time in the melting process.By rotating the cover 3 by means of the starting mechanism 13. The technical device is advanced in the direction of the hole 14 above the Luppo 5 until it reaches the axis of the Luppo 5 and the technical device.

After the charge has melted down into the ingot, the inductor 6 is stopped, the melt is solidified, the vacuum of the furnace is released, and the stool 19 supporting the ingot is pulled out from the Lupo 5, where the ingot is removed and the stool 19 is removed. Prepare for other lysis steps.

〔Effect of the invention〕

The above-mentioned vacuum induction furnace considerably expands the capacity of the furnace for treating the surface of molten metal, and because of the arrangement of the technical equipment directly above the melting crucible 5 and eliminates the idle operation of said equipment, it is possible to Due to the prevention of operating ranges, the overall size of the furnace and the technical equipment used during the melting process can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional view of a vacuum induction furnace according to the present invention, and FIG. 2 is a top view of the vacuum induction furnace. DESCRIPTION OF SYMBOLS 1... Base of the sealed compartment, 2... Shell of the sealed compartment, 3... Cover of the sealed compartment, 4... Seal gasket of the sealed compartment, 5...
Cooled metal crucible, 6... Inductor, 7... Proportional control device, 8
...A device for breaking the bridge and taking a molten metal sample, 9.A device for measuring the temperature of the molten metal, 10.Final supply compartment for charging material, 11.Plasma generator, 12.. Inspection hole, 13... Operating mechanism for rotating the cover 3, 14.
... Hole in base 1, 15 ... Annular support plate, 16...
- Bearing, l8... Hole provided in cover 3, 19... Cooled stool, 20... Vibrator, 21... Vacuum-tight shell of Luppo 5, 22... Seal gasket. f/l;, 2

Claims (1)

[Claims] 1. A cooled metal crucible (5), an inductor (6) surrounding the cooled metal crucible (5), a cooled stool ( 15) in a vacuum induction furnace comprising a closed compartment comprising a shell (2) communicating with the crucible (5) and having a cover (3) equipped with technical devices for carrying out and monitoring the melting process, The sealed compartment is provided with an actuation mechanism (13) for rotation around its axis and a sealing gasket (4) installed between the shell (2) and the cover (3) to carry out the melting process. and a technical device for monitoring is arranged on the cover (3) of the closed compartment in a circumference having a radius (r) equal to the distance between the respective axes of the crucible (5) and the cover (3). A vacuum induction furnace characterized in that it is arranged so as to