JPS61135463A - Method and device for continuous casting of metal-clad material - Google Patents

Abstract

PURPOSE:To produce a large amt. of a metal-clad material at a low cost by casting one molten metal into a moving track then depositing and adhering the other molten metal thereto while the billet thereof is under solidification. CONSTITUTION:The molten metal 8 having the highest m.p. is first cast from a supplying device 7a. A blowing nozzle 13 is further provided adjacently to a control roll 12 to inject a cooling gas or liquid. The front of the billet 8a is cooled by the nozzle 13 while the rear thereof is cooled by a cooler 3. The molten metal 6 having the lower m.p. is thereafter cast from the device 7a onto the billet 8a under solidification. The molten metal 8 to be first cast has substantially sensible heat in the mid-way of solidification and therefore the weldability thereof to the another molten metal 6 is extremely good.

Description

[Detailed Description of the Invention] <Object of the Invention> Industrial Field of Application The present invention relates to a continuous casting method and apparatus for metal clad material, and more specifically, to a method for continuously casting metal clad material in large quantities and continuously at a constant cladding ratio. The present invention relates to a continuous casting method and an apparatus for continuous casting.

Conventional Techniques Metal clad materials, which are made by coating at least the surface of a gold base metal with a cladding of a metal different from that of the metal base metal, are generally produced using the rolling pressure welding method, welding overlay method, or explosion bonding method. It is also made using the casting method. However, these methods have the following various problems, and improvements are required.

In other words, the rolling welding method involves polishing the surfaces of the metal base material and cladding material to be joined in advance, and sometimes applying Ni plating, etc., and welding the peripheral edges of the metal base material and cladding material together. The pre-rolling process is time consuming. For this reason, work efficiency is reduced, making it unsuitable for mass production, and the cost benefits of cladding are reduced. Even so, this point has been largely compensated for, and although it has become popular to some extent for stainless steel clad plates, it is unsuitable for general steel plates and has not yet reached the level of practical use.

Furthermore, the weld overlay method is suitable for forming a metal base material and then cladding it, and is suitable for parts such as nozzles and flanges. However, the composition of the cladding (2) is directly controlled by welding, and when the build-up covers a large area, such as in a plate-shaped material, there are problems in terms of productivity and cost.

In addition, the explosive bonding method uses the explosive power of gunpowder to join, and has many combinations and is suitable for manufacturing small-sized clad materials, but is not suitable for manufacturing large-area plate materials. do not have.

Finally, in the casting method, molten metal is cast in a mold using either the metal base material or the cladding material as the core material to form the cladding 1 or the metal base material, and this steel ingot is hot worked. This is a method of manufacturing metal cladding material. This method has been widely practiced for a long time, but the fatal flaw with this method is that when pouring molten metal into the mold, the surface of the core material is oxidized, and the core material and molten metal become oxidized. Slag is entrapped at the interface, and as a result, the adhesion between the metal base material and the cladding material deteriorates significantly. Furthermore, the casting method does not allow for the production of products with excellent cladding ratio accuracy.
As mentioned above, since the steel ingot cast in the shape of ■ is further hot worked, the ratio of the product weight to the total weight of the steel ingot,
In other words, the product yield is significantly reduced.

In short, none of the conventional manufacturing methods for metal cladding materials is suitable for mass production, resulting in high costs, and it is not possible to obtain products with excellent quality.

Problems to be Solved by the Invention The present invention aims to solve the above-mentioned drawbacks. Specifically, it overcomes the drawbacks of the conventional example by continuously layering and casting dissimilar metals, and can be produced at low cost and in large quantities. The purpose of this paper is to propose a manufacturing method and equipment for metal clad materials suitable for production.

<Structure of the Invention> Means for solving the problem, that is, the present invention involves casting and solidifying at least two types of molten metals in layers on a moving track that moves continuously and is forcibly cooled from the back side. When continuously casting a metal clad material, first, one molten metal is poured onto the moving track, and while this slab is solidifying, another molten metal is deposited on the slab. It is characterized in that it is allowed to coagulate, and this is repeated as necessary to further advance solidification.

Therefore, according to the present invention, at least two kinds of molten metals are poured in layers on a continuously moving moving track to continuously produce a metal clad material, which is inexpensive and has excellent weldability. Metal gland materials can be manufactured continuously with high productivity.

The structure and operation of this means will be explained in more detail with reference to FIG. 1 as follows.

First, FIG. 1 is a layout diagram of an example of a device for implementing the method of the present invention, in which reference numeral 1 indicates a moving track, 1' indicates an upper moving track, and the moving tracks 1 are provided at intervals from each other. It is wound between the rolls 4a, 4b and the tension roll 5, and moves continuously in the direction of the arrow. Further, the back surface of the moving track 1 is forcibly cooled by a cooling device i[3.

At the top of this moving track 1 there are at least two feeding devices 7.
a, 7b are arranged, and the metal layer 5Jj8.6 is injected from each supply device 7a, 7b, respectively.

Further, on the downstream side of these supply devices 7a, 7b, an upper moving track 1' is arranged at a predetermined distance from the moving track 1, and this upper moving track 1' is connected to the rolls 4', 4', 4'.
and the tension roll 5'. Therefore, like the moving track 1, the upper moving track 1' also runs in the direction of the arrow, and during this running, the upper moving track 1' is forcibly cooled from the back side by the cooling device 3'.

Next, in the continuous casting apparatus having the above configuration, on this moving track 1, molten metal 8 having a high melting point is first cast from the supply device 1a. At this time, a control roll 12 is provided at the spout of the supply device 1a, and the thickness of the slab 8a is controlled by this control roll 12. Furthermore, a spray nozzle 13 is provided adjacent to the control roll 12, and from this spray nozzle 13, the thickness of the slab 8a is controlled. Inject cooling gas or liquid. Therefore, the slab 8a
The back side is cooled by the cooling device 3, while the front side is cooled by the spray nozzle 13 with gas or liquid. Due to the erosion, the supply device 1 is placed on top of the solidified slab 8a.
A molten metal 6 having a low melting point is poured from a. In this case as well, the thickness of the slab 6a is adjusted by the rolls 4', 4' of the upper moving track 1'. In addition, when casting in this way, it is necessary to pour the molten metal 6 onto the slab 8a in a state where the surface temperature is within the appropriate range for welding, but this adjustment is done by controlling the casting speed. Let's do it. In addition, it is preferable to spray an inert gas or a non-oxidizing gas such as A, N2, etc. from the spray nozzle 13 for cooling.
Since oxide cannot form on the surface of the slab 8a, two slabs 8
No foreign phases such as oxides are interposed between a and 6a, and the adhesion of the cladding is not inhibited. In addition, the first molten metal 8
Since it has sufficient sensible heat while it is solidifying, the weldability with another "';1J11 gold WA7" is extremely good.
The manufacturing cost and production efficiency are much higher than the conventional method of welding to solid materials. At this time, the following important findings were discovered through numerous experiments.

That is, in liquid-liquid cladding production as in the present invention, a metal with a high melting point is first cast, and metals with a low melting point are gradually poured.

By doing so, it is possible to prevent breakout caused by melting the previously solidified slab 8a, and also to prevent the fusion bond (2) from becoming unstable. Normally, as mentioned above, materials with the highest melting points are cast first, but in the case of stainless steel and ordinary steel, it is better to weld ordinary steel on top of stainless steel because they are more easily soluble in gas cutting than in the order of melting points. preferable.

Further, in the above, an example of a 2 ml metal clad material was explained, but when the amount is 311 or more, a multilayer clad can be easily manufactured by using a large number of molten metal supply devices. Considering the melting characteristics of various metals,
Not only 21m but also multilayer cladding can be manufactured. Further, the present invention can be applied to both ferrous and non-ferrous materials, and the casting speed may be adjusted between the rolls 4a and 4b in controlling the surface temperature of the slab and manufacturing multilayer cladding.

Reference numerals 9a and 9b indicate submerged nozzles 9a and 9b of the respective supply devices 7a and 7b, and reference numerals 10 and 10' indicate pinch rollers for pulling out the cast metal cladding material 11. By removing it, the cladding ratio and thickness can be precisely regulated.

Operation The operation of the present invention will now be explained in more detail through the manner of use of the apparatus shown in FIG. 1.

First, the metal layer s8 cast first from the supply device 7 is forcibly removed heat and cooled by the cooling device 3 behind it while being sent along with the moving track 1, and in this state, the metal layer s8 is cast from another supply device f7b. The molten metal 6 is poured and cooled by the cooling device 3' of the upper moving track 1, and these slabs 8a,
Adhesion occurs at the interface between the materials 6a, and the solidified shell grows and thickens, and is then pulled out as a metal clad material 11 by pinch rollers 10, 10'. In this way, since the cooling device 3.3' is indirectly cooled through the moving track 1 and the upper moving track 1', poor adhesion due to excessive cooling of the slab 6a and welding due to insufficient cooling are effectively prevented. can.

In addition, since the initial high melting point metal 'R' 8 is indirectly cooled by the cooling device 5 via the moving track 1 during traveling, the temperature of the high melting point metal molten metal 8 generated therein does not occur excessively. When another molten metal 6 comes into contact with the high melting point metal layer 48, it adheres from the contact surface, and a solidified shell is generated and grows through this, and the melting occurs on both or one side. Alternatively, a metal clad material vertically and solidly welded in multiple layers can be stably and continuously cast.

Example Next, examples will be described.

First, in the apparatus shown in FIG. 1, low carbon At killed steel (melting temperature: 1,530°C) is cast onto the moving track 1 from the supply device 7a, and adjusted by the control roll 12 so that the thickness is 13.5 m and the width is 10,011 mm. The spraying is performed using Ar from nozzle 13.
is sprayed to solidify the surface of the slab 8a, and the surface temperature is 120
After confirming 0° C., copper alloy was supplied from the supply device 7b.

In this case, the traveling length of the slab is 2I, the amount of circulating water (25°C) in each cooling device 5.5' is 6 m37 minutes, the thickness of the slab 8a is 13.5 m, and the total thickness is Lt27IllI
, the casting speed was 211/min, and the metal clad material 11 thus obtained was immediately rolled to a thickness of 1.2i.
lll clad steel plates were manufactured.

In this way, the adhesion of the cladding (3) was extremely good, and the surface quality was also excellent.

Note that the present invention is not limited to the field of steel shown in the examples, but can also be applied to the field of non-ferrous metals such as copper and aluminum.

<Effects of the Invention> As explained in detail above, the present invention provides the following advantages:
When continuously casting a metal cladding material by casting and solidifying at least two types of molten metal in layers, first, one molten metal is poured onto the moving track, and then this slab is solidified. In the meantime, another molten metal is deposited and adhered onto the slab, and this is repeated as necessary to continue solidification.

Therefore, since the present invention is configured as described above, the present invention exhibits the following effects.

(a) Metal cladding materials can be manufactured in large quantities, and the manufacturing cost is significantly reduced.

(b) High product yield and excellent adhesive properties.

(c) The cladding ratio can be adjusted over a wide range.

(d) Applicable to a wide range of other materials including stainless clad steel.

Furthermore, depending on the type of metal cladding material and the cladding ratio, it is also possible to insert a heat insulating material such as asbestos on the back side of the slab to be cast first to actively promote heat insulation during casting. The moving track and the upper moving track may have any structure as long as they can move in one direction, but they are generally endless and are usually made of steel belts or heat-resistant materials. Configure.

[Brief explanation of drawings]

FIG. 1 is a layout diagram of an example of a continuous casting apparatus for carrying out the present invention. Symbol 1...Moving track 1'...Upper moving track 3.3'...Cooling devices 4a, 4b, 4' -...a-le 5. 5'・
...Tension rolls 1a, 7b...Feeding device 6.8...Metal melt '4 6a, 8a...
...Each slab 9.9'...Immersion nozzle 11...Metal clad material 13...Nozzle for spraying

Claims (1)

[Claims] 1) When continuously casting a metal clad material by casting and solidifying at least two types of molten metal in layers on a moving track that moves continuously and is forcibly cooled from the back side, First, one molten metal is poured onto the moving track, and while the slab is solidifying, another molten metal is deposited and adhered onto the slab, and if necessary, it is A continuous casting method for a metal clad material, characterized by repeating the process and then continuing to proceed with solidification. 2) At least two molten metal supply devices are arranged at intervals on a continuously moving moving track, and an upper moving track is arranged downstream of these feeding devices at a predetermined distance on the moving track. 1. A continuous casting apparatus for metal clad material, characterized in that a cooling device is provided on the upper moving track and on the back side of the moving track.