JPS62166053A - Production of clad metal - Google Patents

Abstract

PURPOSE:To continuously produce a titled metal which is satisfactorily press- welded at a high speed by drawing molten metals while respectively cooling the same with plural cooling rolls in an inert gaseous atmosphere, laminating and moving the semi-molten metals on a moving belt and subjecting the metals to reheating and press-welding. CONSTITUTION:The molten metal 4 in a tundish 6 is cooled by the endless belt put on nip pulleys 2, 3 and the 1st cooling rolls to the semimolten metal A' in the inert gaseous atmosphere in a sealing cover 13. The molten metal B on a spout 9 is cooled by the 2nd cooling roll 7 and the molten metal C on a spout 12 by the 3rd cooling roll 10, respectively to the semimolten metals B', C' which are then laminated in a nonoxidation state. The laminated material is reheated to an adequate temp. by an electromagnetic induction heater 14 and is rolled and delivered between pinch rolls 15 and rolling down rolls 16. The clad metal which is uniformly and securely welded in the nonoxidation state is continuously produced at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing clad metal such as three-layer clad steel.

(Prior Art) Conventionally, in the manufacturing method of clad metal, auxiliary rolls are placed above the main rolls with flanges that are placed opposite each other on the left and right, and each main roll
While cooling the molten metal supplied by the auxiliary rolls, it is sent downward while being adhered to the surface of the main roll under the pressure of the rolls, and then these semi-molten thin slabs are peeled off from the surface of the main roll using a fixed mold. A method has been developed in which molten metal of different types is poured between the slabs and cooled in the mold (Japanese Patent Publication No. 36-1618).
(Refer to Japanese Patent Publication No. 2003-110001) 0 (Problems to be Solved by the Invention) However, this conventional method can only produce a two-layer or three-layer clad metal. For the outer layer slab.

While clad metal can be manufactured continuously, it cannot be manufactured at high speed because there is a risk of cracks occurring when it is peeled off from the main roll surface. In addition, the molten boundary of the inner layer slab is welded to the single solidified shell of the outer layer slab under the static pressure of unsolidified molten metal, but because the static pressure is small, poor adhesion may occur, leading to a decrease in product strength. We could not avoid the inconvenience that this may occur.

The present invention was devised to solve the above-mentioned conventional problems, and its purpose is to enable high-quality clad metal to be manufactured continuously at high speed, and to enable the number of layers of clad metal to be changed as appropriate. do.

(Means for Solving the Problems) The method for manufacturing clad metal according to the present invention involves drawing out the molten metal while cooling it with a plurality of cooling rolls in an atmosphere shut off from outside air, and drawing out the semi-molten cast slabs. A process of placing one of the slabs on a moving belt, transferring and stacking other slabs onto the slab at mutually shifted positions, a process of heating the inside of the laminated slabs by induction heating, and a process of laminating the slabs. This method is characterized by the step of rolling down the slab in a heated state, and with this structure, there is no room for cracks to occur in each layer of slab that makes up the clad metal (speeding up metal manufacturing), and each layer of slab is rolled down in a heated state. To uniformly and firmly weld the entire surface between the two without oxidizing the surface (improving metal quality), and
It is possible to change the number of cooling rolls used (adjust the number of cladding layers).

(Example) First, an example of an apparatus for implementing the present invention will be described with reference to the drawings.

In the figure, 1 is a belt having the same structure as the lower belt of the belt caster, which is wound between nip pulleys 2 and 3 and installed horizontally or inclined downward from the horizontal, and is rotated in the direction of the arrow shown in the figure. At the same time, the upper belt is water-cooled from below.

Reference numeral 4 denotes an internal water-cooled copper first cooling roll, which is disposed opposite to the upper stage of the surface of the belt 1 near the nip pulley 2, and is rotated in the direction of the first arrow shown at the circumferential speed that is the same as the belt speed. Reference numeral 05 denotes a dam block, which is made by connecting a large number of square blocks in the form of beads with straps passing through them. It is sandwiched between the two parts.

6 is a tanditshu capable of supplying the first molten metal A;
It is arranged so as to face into a space composed of a belt 1, an oni cooling roll 4, and left and right dam blocks 5.

Reference numeral 7 denotes a second copper cooling roll of internal water cooling type, which is formed to have a considerably larger diameter than the first cooling roll 4, and flanges 8 are provided at both ends of the roll 7 at the same spacing as the dam block 5. It is being This roll 7 is arranged opposite to the upper stage of the surface of the belt 1 near the middle, and the collar 8 is placed on the dam block 5 with the inner surfaces aligned with each other, and the circumferential speed is the same as the belt speed. It is designed to be rotated in the direction of the first arrow shown in the figure.

Reference numeral 9 denotes a gutter, which is disposed so as to face between the upper flanges 8 of the second cooling roll 7 so as to be able to supply the second molten metal B.

1O is an internal water-cooled third copper cooling roll, which is formed to have a large diameter like the second cooling roll, and the roll 10
Flanges 11 are provided at both ends of the dam block 5 at the same opposing distance as the dam block 5 and higher than the flange 8 of the second cooling roll 7 . This roll 10 is arranged opposite to the upper stage of the surface of the belt 1 before the nip pulley 3, and the collar 11 is placed on the dam block 5 with the inner surfaces aligned with each other, and the circumference is the same as the belt speed. It is designed to be rotated at a speed in the direction of the first arrow shown in the figure.

Reference numeral 12 denotes a gutter, which is disposed facing between the upper flanges 11 of the third cooling roll 10 so as to be able to supply the third molten metal C.

Reference numeral 13 denotes a seal cover that covers the entire casting areas 1 to 12, and an inert gas is supplied into the cover 13 so that the casting area is placed in an atmosphere that is shut off from outside air.

14 is an electromagnetic induction heating device (only the coil is shown in the drawing)
It is located downstream of the casting area.

15 is a pinch roll, and 16 is a reduction roll, which are arranged opposite to each other on the downstream side of the electromagnetic induction heating device, and a reduction adjustment device 17 (in the actual case, a reduction cylinder) is capable of adjusting the reduction of the reduction roll 16 to a pinch roll of 51 tll. It has become.

Although an example of an apparatus for manufacturing a three-layer clad metal has been described, for a two-layer, four-layer, etc. clad metal, similarly, the same number of cooling rolls as the number of layers are placed on the upper stage of the belt 1, shifted in the belt movement direction, In addition, they may be arranged facing each other so that the height of the brim gradually increases.

Next, a case will be described in which the present invention is implemented using the above device.

(1) Inject an inert gas into the seal cover 13 to place the entire casting area under an atmosphere that blocks outside air.

In this state, the slabs AT, BL, and CI of each layer constituting the clad metal (three layers in the example) are cast, and after one slab A1 of them is placed on the moving belt 1, the slab Al is cast. The other cast slabs Bl and cl are sequentially transferred at mutually shifted positions and laminated with non-oxidized layer surfaces.

Specifically, the first molten metal A supplied from the tundish 6 is injected into a space made up of the belt 1, the first cooling roll 4, and the left and right dam blocks 5, where it is cooled and drawn out. A piece of Al is cast. This slab A
1 moves on the belt 1 (see Figure 2).

The second molten metal B is supplied from the gutter 9 to the upper part of the second cooling roll 7, and is drawn out while being cooled by the roll 7.
A slab Bl is cast. This slab Bl is naturally peeled off from the roll surface under its own weight and is sent downward (moving bell)
The solidified shell of the slab Al and the molten interface of the slab Bl are welded together (see FIG. 3).

The third molten metal C is supplied from the gutter 12 to the upper part of the third cooling roll 10, and is drawn out while being cooled by the roll IO, thereby casting a slab C1.

This slab C' is naturally peeled off from the roll surface under its own weight and sent downward, and the laminated slab Al on the moving belt 1,
As it moves, it overlaps with Bl, and the solidified shell of slab B1 and the molten interface of slab C' are welded (see Fig. 4)0 (2) Laminated slab A'HB' I C that has left the casting area '
The inside is heated by induction by an electromagnetic induction heating device 14, and the welded parts between the layers of the laminated slabs AI, BL, and CI are reliably and uniformly heated.

(3) In the heated state, the heated laminated slabs Al, Bl, 01 are passed between the Vinci rolls 15 and the reduction rolls 16 whose interval is adjusted by the reduction adjustment device 17, and are reduced to a constant thickness, At this time, the layers are firmly welded by the interlayer compressive force acting on each interlayer weld, and the slabs At, B1
．． CI becomes one.

(Effects of the Invention) As described above, the present invention allows each layer of slabs constituting the clad metal to be easily and smoothly peeled off from the cooling roll without causing any cracks, and also to prevent the surface oxidation between each layer of slabs from being caused by the roll. Since the entire surface can be welded uniformly and firmly by rolling, high-quality clad metal with a constant thickness can be manufactured continuously at high speed. Further, the number of cladding layers can be changed as appropriate by changing the number of cooling rolls used.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of an apparatus for implementing the present invention, and FIG.
Figures 3 and 4 show lines 1 and 2 in Figure 1 in a situation where the present invention is being implemented. 3 is an enlarged cross-sectional view taken along the line ①. 1...bell), 2.3-27'7'-IJ, 4
...First cooling roll, 5...Dam block, 6...
・Tandish, 7...Second cooling roll, lO...
・Third cooling roll, 8, 11... tsuba, 9, 12...
Gutter, 13... Seal cover, 14... Electromagnetic induction heating device, 15... Pinch roll, 16... Reduction roll.

Claims (1)

[Claims] In an atmosphere where outside air is shut off, the molten metal is cooled and pulled out by a plurality of cooling rolls, one of these semi-molten slabs is placed on a moving belt, and another slab is placed on top of the semi-molten slab. A method of manufacturing clad metal characterized by comprising the steps of transferring and stacking the laminated slabs at mutually shifted positions, heating the inside of the laminated slabs by induction heating, and rolling down the laminated slabs in the heated state. Production method.