JPS61172658A - Continuous casting method of dissimilar kinds of steel ingot - Google Patents

Abstract

PURPOSE:To execute continuous casting with a small number of operators in a continuous casting installation having plural molds and two units of travelable tundish cars by providing devices which can charge continuously and mechanically ingot connecting metals to the specific positions of said cars. CONSTITUTION:The tundish cars 1, 2 which are self-travelable on rails 3 and on which the tundishes 4, 5 are respectively mounted are disposed on both sides of molds A, B in-between. The devices 6, 7 for charging the connecting metals are respectively connected to the opposed surfaces of the cars 1, 2 via base plates 8, 9 as carriages which are L-shaped when viewed from above. The car 2 is first moved onto the molds A, B and the 1st molten steel is fed into the tundish 5 from which the molten steel is poured into the molds A, B. The car 2 is moved leftward upon ending of such pouring and the device 7 is positioned onto the mold B. The car 1 is then moved so as to bring the device 6 over the mold A. The devices 6, 7 are thereupon operated to charge and detain the connecting metals (a), (b) onto the solidified shells in the molds. The cars 1, 2 are thereafter moved leftward and the 2nd molten steel is fed into the tundish 4, from which the molten steel is poured into the molds A, B.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for continuously casting slabs of different steel grades, and particularly relates to a method for continuously casting slabs of different steel grades. This relates to the operation method for inserting connected hardware, etc.

(Prior art) In continuous casting equipment, for example, in order to continuously cast slabs of different steel types without interrupting the injection of molten steel into the mold, slab connecting hardware is inserted into the joint of both slabs. A continuous casting method is being implemented in which the length of the slab portion in which different steel components are mixed is made as short as possible by making the slabs continuous, thereby improving yield and workability.

In this type of continuous casting of slabs of different steel types, after the injection of the first molten steel is finished, the withdrawal speed of the slab is lowered to maintain the height of the molten steel surface in the mold at an appropriate position, and then the molding is performed in advance. The resulting slab connecting hardware is put into the mold, and after it is locked onto the solidified shell that has developed in the mold, in the next step, second molten steel is injected and this second molten steel is poured near the connecting hardware. A method is used to solidify and continuously cast slabs of different steel types.

(Problems to be Solved by the Invention) By the way, the above-mentioned work of charging the slab connecting hardware into the mold has conventionally been carried out by several workers from above the mold into the center of the molten steel while visually checking and making corrections. However, this work was extremely dangerous and had the disadvantage that as the number of molds (strands) increased, the number of workers required increased significantly. Therefore, in order to eliminate the above-mentioned conventional drawbacks, the present applicant has developed a casting device for connecting cast slabs and has already filed a patent application (Japanese Patent Application No. 188625/1983).
(Japanese Patent Application No. 58-206750).

The present invention uses a device capable of mechanically inserting slab connecting hardware, such as the above-mentioned casting slab connecting hardware loading device, and installs this charging device on opposite sides of two tundish cars. The purpose of the present invention is to provide a method in which both can be moved and operated efficiently and continuous casting of slabs of different steel types can be performed with a small number of workers.

(Means for Solving the Problems) The method of the present invention is to connect a casting device for connected hardware directly or via a trolley to opposite sides of two tanditshu cars, and to connect the casting device to the casting device. Connecting metal fittings corresponding to the number of molds are loaded in advance, and while one tanditsu car is in the operating position and injecting molten steel from the tanditsu car to a plurality of molds, the other tanditsu car is placed on standby at the preheating position. , Next, when pouring different types of molten steel, finish the injection of the molten steel, move the two tanditshu cars, place the connecting hardware of each injection device on the corresponding mold position, and then use the injection device to After putting each connected hardware into the mold, the one tanditshi car is moved to the preheating position, the other tanditshi car is moved and the tanditshi car is placed on the position corresponding to the mold, and the dissimilar molten steel is molded. The gist of this is that slabs of different steel types are continuously cast by starting injection into the mold.

(Example) Hereinafter, a first example of the present invention will be described based on the drawings. The first embodiment is a continuous slab casting method having two molds (strands), and FIG. 1 is a schematic plan view showing the state before the start of work.

In the figure, A and B indicate molds, and tanditshi cars 1 and 2 are arranged on both sides (preheating standby position) of these molds A and B. These tanditshu cars 1.2 are each disposed on the same track 3 so as to be self-propelled, and each tanditshu car 1.2 is equipped with a tanditshu 4.5.

In addition, the tundish 4.5 has molten steel discharge ports 4A, 4B and 5^, 5B located at positions corresponding to the two molds, respectively, and each molten steel discharge port has an opening/closing II (not shown). figure)
is equipped with.

Furthermore, on the opposite sides of Tanditushkar 1 and 2,
Connecting hardware input devices 6.7 are connected to each other via a base 8.9 which is an L-shaped truck when viewed from above.

The structure of these loading devices 6, 7 is not particularly limited as long as it is capable of mechanically loading the connecting hardware, but for example, one having the structure shown in FIG. 2 may be used. In FIG. 2, reference numeral 21 denotes an inverted-shaped carriage that can be raised and lowered along a pair of guides 22 provided on the front surface of the base 8 or 9, and this carriage 21 is raised and lowered by a cylinder 23 above. A pair of guides 24 are provided on the upper surface of the projecting portion of the carriage 21, and an inverted-shaped clamp table 25 is placed along each guide 24 so as to be movable back and forth.

Reference numeral 26 denotes a clamp whose upper end is rotatably supported by each clamp base 25, and whose lower end is formed into a connecting hardware gripping portion 26a, and a gripping/releasing cylinder 27 is disposed between the upper ends of these clamps 26. has been done. Therefore, according to this loading device, the connecting hardware held in advance between the lower ends of the clamps 26 can be loaded into a predetermined position within the mold.

Next, FIGS. 3(a) to 3(C) are schematic plan views showing each aspect of the continuous casting method for different steel types in a step-by-step manner. Said first
From the state of the figure, Tanditushka 2 on the left is mold A.
The first molten steel is injected into the tundish 5 from a ladle (not shown) above the tundish car 2, and at the same time, the molten steel discharge ports 5A and 5B are opened and the molten steel is poured into the molds A and B. is injected. During this time, the tanditushka 1 on the right side is waiting at the preheating position. (See FIG. 3(a)) In this state, when the injection of the first molten steel is completed, the withdrawal speed of the molten steel is reduced. Then, the injection of molten steel from the above-mentioned one dollar to the tundish 5 is stopped, and the molten steel discharge port 5A of the tundish 5,
Close 5B. Next, as shown in FIG. 3(b), the left tanditshi car 2 is moved to the left, and its connecting hardware insertion device 7 is positioned on the left mold B, and the right tanditshi car 2 is moved to the left. The car 1 is moved so that the connecting hardware insertion device 6 is placed above the mold A on the right side. In this state, each input device 6.7 is operated to connect the slab connecting hardware a,
b is placed on the solidified shell in the mold and locked.

Next, as shown in FIG. 3(c), the left side tundish car 2 is moved to the left preheating standby position, and at the same time, the right side tundish car 1 is further moved to the left to discharge the molten steel from the tundish car 4. Mold A and B for exits 4A and 4B
position it above. In this state, the second molten steel is injected into the tundish 4 from another droplet (not shown), and
The molten steel discharge ports 4^ and 4B are opened and molten steel is injected into the vicinity of the connecting hardware a and b in the molds A and B. And this second
After the molten steel has solidified, the drawing speed of the molten steel is increased to perform continuous casting of different types of slabs.

FIG. 4 is a schematic plan view of a multi-strand continuous casting facility for producing blooms and billets as a second embodiment. The difference from the previous embodiment is that the number of molds (strands) is increased to four. Correspondingly, four molten steel discharge ports 4A to 4D and 5A to 5D are provided in each tanditshu 4.5 mounted on each tanditshu car 1.2, and in each tanditshu car 1.2, Two charging devices, 6.6" and 7.7", were installed to match the placement of the molds.

However, even when the number of strands is increased, the operation of moving each tundish car 1.2 is performed in exactly the same manner as in the previous embodiment. In this case, connecting hardware a and b are loaded into molds A, B using the right loading device 6.6'', and connecting hardware c and d are loaded into molds C and D using the left loading device 7. .7°.

(Effects) As explained above, according to the method of the present invention, the connecting hardware feeding device connected directly or via a trolley to the facing sides of two tanditushkas can be specified exclusively for a predetermined mold. the two Tanditshu cars are moved almost simultaneously to position each charging device on a predetermined mold.
Since the connecting hardware can be fed into all the molds at the same time, the feeding work can be done mechanically and quickly. In addition, since the operator who moves and operates the tanditshuker can also operate the charging device, continuous casting of slabs of different steel types can be performed with an extremely small number of operators. Furthermore, since the operator does not have to manually perform various tasks such as inserting the connecting hardware, the work load is reduced and safety is improved.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view showing the state before the start of work in a continuous casting method for slabs having two molds (strands) as a first embodiment of the present invention, and Fig. 2 shows an example of a connecting hardware feeding device. Perspective views shown in FIGS. 3(a) to 3(c)
4 is a schematic plan view showing each aspect of the continuous casting method for different steel types in a step-by-step manner, and FIG. 4 is a schematic plan view of a multi-strand continuous casting facility for producing blooms and billets as a second embodiment. be. 1.2... Tanditushka, 3... Orbit, 4.
5... Tandish, 6.6°, 7.7°... Feeding device, 8.9... Base, A, B, C, D... Mold, a, b, cSd... Connecting hardware.

Claims (1)

[Scope of Claims] In a continuous casting facility having a plurality of molds and having two tundish cars each movably disposed, there is provided a casting device for casting slab connecting hardware on opposing sides of each of the tundish cars. are connected to each other directly or via a trolley, and the charging device is loaded with connecting hardware corresponding to the number of molds in advance, and one tundish car injects molten steel from the tundish into the plurality of molds at the operating position. With the other tundish car waiting in the preheating position,
Next, when pouring different types of molten steel, after finishing the injection of the molten steel, move the two tundish cars, place the connecting hardware of each injection device on the corresponding mold, and use the injection device to connect each connection. After putting the hardware into the mold, one of the tundish cars is moved to the preheating position, and the other tundish car is moved to place the tundish at a position corresponding to the mold, and the dissimilar molten steel is placed in the mold. 1. A method for continuously casting slabs of different steel types, characterized in that slabs of different steel types are continuously cast by starting injection into the steel.