JPH028593Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(a) Industrial application field The present invention relates to a torch truck for cutting slabs made by continuous casting, and more specifically to a torch truck that can spray cooling water to the torch cutting opening on the back side of the slab. Regarding. (B) Prior Art Continuous casting equipment is provided with a torch truck for cutting slabs produced by continuous casting into predetermined dimensions. Since this torch truck has a gas cutting type structure, sag is formed on the back side of the slab after gas cutting, and if this sag is not removed and rolled, this sag will cause defects on the surface of the rolled product. For this reason, conventionally, this sagging has been mechanically cut and removed. As a conventional technique for removing droop from a cut section of a slab, there is a technique disclosed in, for example, Japanese Patent Application Laid-open No. 195569/1983. This technology attempts to cool the slab to below 650°C to make it easier to remove the drippings by using a cutting blade to cut and remove the drippings after gas cutting the slab. As a result, it was found that depending on the shape of the sag generated during gas cutting, it was impossible to completely remove it. That is, as shown in Fig. 6, due to the solidification of the molten sag that occurred at the early stage of cutting and the rapid expansion of the high-pressure cutting fire, the molten sag t becomes the slab s in the middle stage of cutting (Fig. 6 [B]). As shown in FIG. 6 (C), a wide molten sag is generated. Such molten sag has a gentle shape, and in order to remove it with a knife, the blade must be sharp and the power required for removal must be large. (c) Problems to be solved by the invention The problem to be solved by the invention is that the shape of the molten sag is a shape with a wide adhesion width. The goal is to allow the spores to grow narrowly and downward, making it easier to remove them with a knife. (d) Means for solving the problem The technical means of the present invention to solve the problem includes a torch movable in a direction substantially perpendicular to the direction of movement of the trolley, and the torch is used to perform continuous casting. In a torch truck for cutting slabs, a water discharge nozzle that sprays cooling water toward the torch cutting port on the back side of the slab is arranged at a distance from the slab. (E) Effect In the above configuration, the torch is moved in the width direction of the slab while the slab is cut by gas, and cooling water is injected from the water nozzle toward the torch cutting opening on the back side of the slab. The molten drip that emerges from the cut hole on the back side of the slab is cooled by this cooling water and grows downward. (F) Embodiment An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, a torch truck 1 of this embodiment is shown. In the figure, 2 is a truck body, 3 is a wheel rotatably attached to the bearing part 2a of the truck body 2, 4 is a drive motor that drives at least a pair of left and right wheels, and 5 is a truck attached to the front edge of the truck body 2. A slider movably supported by a guide rail 3b extending in a direction perpendicular to the traveling direction of the slider, 6 a drive motor for moving the slider 5 along the guide rail, and 7 a slider 5.
A torch is attached to the slider and moves with the slider to cut the slab s, and 8 is a fixing device that links the torch truck to the movement of the slab s, all of which are almost the same as those of conventional torch trucks. . Therefore, a detailed explanation of its structure and operation will be omitted. A water spray nozzle 10 is attached to the slider 5, and as the slider moves, the water spray nozzle 10 also moves. The tip 10a of the water discharge nozzle 10 is tapered so that the cooling water can be sprayed over a long distance. The tip 10a is directed vertically below the torch on the back surface of the slab, that is, toward the torch cutting opening on the back surface of the slab when cutting the slab. The water discharge nozzle 10 is bent in a U-shape at the lower part so as not to interfere with the slab even when the slider 5 moves to the center of the slab. A flexible hose 11 is installed at the base end of the water nozzle.
is connected, and cooling water is supplied via a flexible hose. The flexible hose 11 is suspended from a wire rope 13 stretched between two pillars 12 erected on the sides of the truck body 2 so as to be slidable in the direction of movement of the torch truck.
The supply of cooling water to the water discharge nozzle is not always performed, but is linked to the gas cutting in the torch. Water is now released at the same time as the start of the season. In the torch truck having the above configuration, when cutting the slab s, gas is supplied to the torch 7, cooling water is supplied to the water discharge nozzle, and the slider is gradually sent toward the center of the slab by the drive motor 6. It will be done. When the slab is cut with gas, the molten drip t flows from the cut hole to the back side of the slab as shown in Fig. 3 [A], but because it is rapidly cooled by the cooling water, As shown in [B], the width does not increase and extends downward. Example: A high carbon steel slab with a width of 900 mm to 1030 mm is cut at a temperature of 850° to 900°C at a cutting speed of 250 mm/min and a nozzle air/water ratio.
The following table shows the results of tests with different amounts of cooling water for nozzle angles of 30° and 45°. As is clear from this table, the amount of cooling water is 2/
A suitable range is from 10 minutes to 10 minutes. In addition, preliminary tests revealed that the appropriate nozzle angle is 15° to 65° from horizontal. Note that the height h and width w of the melt dripping are determined as shown in FIG.

【table】

[Table] In the above embodiment, there is one nozzle hole for one torch, but it is also possible to use two nozzle holes as shown in FIG. 5 so that the nozzle hole is ejected from both sides diagonally below the cutting opening. (G) Effects As is clear from the above experimental results, dripping can be easily removed by cutting using the torch truck of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the continuous casting torch carriage according to the present invention, Fig. 2 is a front view of the torch carriage of Fig. 1, Fig. 3 is an explanatory diagram of the formation of melt droop by the torch carriage of Fig. 1, and Fig. 4. 5 is a perspective view of a modified example of the water discharge nozzle, and 6 is a diagram showing how to measure the dimensions of the melt dripping.
The figure is a diagram showing a state during cutting using a conventional torch truck. 1: Torch truck, 2: Truck body, 5: Slider, 7: Torch, 10: Water nozzle.

Claims (1)

[Scope of utility model registration request] A torch truck that is equipped with a torch movable in a direction substantially perpendicular to the direction of travel of the truck and that cuts continuously cast slabs with the torch, which sprays cooling water toward the torch cutting port on the back side of the slab. A torch truck for a continuous casting machine, characterized in that a nozzle is arranged to be separated from the slab.