JPS58179554A - Cutting method of crop in gas cutter for continuous casting - Google Patents

Abstract

PURPOSE:To prevent the damage of a cutting torch by piercing, by interrupting the cutting of a crop so as to provide a partly uncut part in an ingot then ejecting a cutting gas intermittently to form a cutting groove and cutting the crop in the prescribed position. CONSTITUTION:An ingot 3 which is cast continuously and is conveyed with a roll table 2 is clamped with a clamping device 5. A body 1 of a gas cutter is moved on a rail 11 synchronously with the ingot 3 and the end face of the ingot 3 is detected with an end face detector 10, then the cutting of a crop 14 with a cutting torch 7 is started. The cutting is interrupted temporarily and a driving device 8 is stopped while there is about 50mm. uncut part upon progression of the cutting to a certain extent. A cutting gas is thereafter ejected intermittently from the torch 7 to make a cutting groove 15 corresponding to the curve of the ingot 3. When the body 1 moves together with the ingot 3, a limit switch 13 for detecting position operates to actuate the device 8 and to resume the cutting with the torch 7, whereby the crop 14 is disconnected thoroughly and is dropped into a carriage 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting a top crop or a test piece of a continuously cast long slab, and more specifically, it relates to a method for cutting a top crop or a test piece of a long slab that is continuously cast, and more specifically, a method for cutting a top crop or a test piece of a long slab that is continuously cast. When the remaining part is moved to a predetermined position and the remaining portion is re-cut to take a crop, etc., re-cutting may be started with the center of the cutting torch deviating from the kerf at the time of cutting interruption due to the bending of the IIr slab. The present invention relates to a crop cutting method that prevents this from occurring.

Continuously cast slabs are rolled by high-temperature molten metal rolling rolls and cut into appropriate lengths by cutting equipment, and the quality of these slabs is determined by the distribution of non-metallic substances contained in the molten metal. Because of this difference, it is common practice to cut and collect the tip of a slab as a test piece for the purpose of inspecting the inside of the slab.

When cutting a crop or a test piece from a cast slab, conventionally, as shown in JP-A No. 47-25782, a portion is left uncut along the cutting width of the slab, and this portion allows the crop to be cut into the slab. A method has been developed in which the connected crop is transported to the cropping cart position, internal cutting FBT is started on the cropping cart, the uncut portion is completely cut off, and the crop is dropped onto the cropping cart. However, in the above method, not only in the case of a wide slab but also in the case of an intermediate slab or a plume, as shown in Fig. 1, in the first stage (a), as shown in Fig. When cutting is temporarily stopped, leaving part C as a small piece, and conveying the cutting machine main body, slab A, and Keklops trolley in synchronism [Photographing during conveyance,
Alternatively, the slab a may be bent due to the temperature difference between the outside and inside of the slab. By this, (b) −w , i −f al+
<ψ There is a misalignment between cutting torch b and the cutting end point of the slab, and (2
In the state shown in Figure 1, the cutting torch a, which was on the cutting groove, is re-cutting l! in the second stage. When starting l'r, it is not on the kerf but on the uncut slab. Therefore (
b) If re-cutting is started in the state shown in the figure, a piercing state will occur and the slag will blow up, causing the cutting torch a to melt and wear out.

The present invention improves two disadvantages of the conventional technology and relates to a completely new technology.

An embodiment of the present invention will be explained with reference to figures.
In the figure, 1 is the roller table 2K.

Therefore, the main body of the gas cutting machine is for cutting the slab 6 being conveyed, and has a machine drive device 4 at the rear, and has claws at the bottom that are crimped onto the slab 3, thereby cutting the main body 1 into the slab. A clamping device is provided which can be moved synchronously with 6. Also, there is a torch carriage installed in the fiiJi of the 6 & machine body 1, which has a cutting torch 7 and is movable on a carriage rail 9 by a drive device 8 [k! R
It is attached.

The drive device [8 is driven and controlled by a series of cutting sequence circuits, and is capable of ejecting cutting gas from the cutting torch 7 in accordance with the setting of a timer (not shown). Further, the torch carriage 6 is provided with a guard f10 for detecting the cut end face of the slab 6. The main body 1 can run on a traveling rail 11 in the same direction as the slab 3, and a cropping table 1112 is disposed below the traveling rail 11 so as to be movable in a direction intersecting the casting line. Also, on the traveling rail 11, there is a sign that the slab 6 and the main body 1 have been moved onto the crop cart 12.
A position detection limit switch 13 is provided which operates at the same time.

When cutting and collecting crops using the zlMftK constructed as described above, the explanation will be given with reference to FIG. When running in synchronization with the slab 6, the end Ij1 of the slab 6 is detected by f end face detection %t110, and cutting of the crop 14 is started. Then, through a series of sequence circuits, the uncut portion is shown in the (JI) diagram. (approximately 50 points in length) At one position, the drive device 8 is stopped, the cutting gas is closed, and the cutting is temporarily interrupted. Next f In this state, the slab 6 and the main body 1t crop cart 12 are moved to the position where electricity is applied, but during this time the cutting torch 7 is intermittently activated by operating a timer gate as appropriate by a series of sequence circuits. (b) vibration during movement as shown in figure;
Cut grooves 151' are created in accordance with the bending of the piece 6 due to temperature differences and the like.

When the slab 3 and the main body 1 are moved onto the cropping cart 12, the position detection limit switch 13 is activated, which activates the drive device 8, blows out gas, and lights the cutting torch 7.
starts cutting again, completely cuts off 14 crops, and drops the crops 14' onto the Y-crop cart 12.

In the previous example, cutting gas was intermittently ejected by using a timer, but by using a pulse transmitter, cutting gas was ejected every time a piece traveled a set distance, and the cutting gas was ejected intermittently by using a timer. Depending on the edge of the piece, you can create a JI groove, and also attach a limit switch to the cutting machine body, attach several strikers to the running rail or running stand, and braze the strikers. It may also be configured such that when the cutting machine main body is moved to a certain position, cutting gas is ejected to create a cut groove corresponding to the bending of the slab.

As described above, when cutting a crop, the present invention interrupts the cutting by leaving a certain length of the slab uncut, and then cuts the slab from the cutting torch while the slab is moved from the interrupted position to the crop cart. The structure is such that gas is intermittently ejected to create crop cuts 11 according to the bending of the slab, so even if the slab is moved, the cutting torch will not deviate from the top of the kerf. This completely prevents the piercing condition caused by misalignment between the cutting torch and the kerf when re-cutting is started on the cropping cart as in the past.
This allows for smooth lob cutting without damaging the cutting torch Y, and furthermore, the crop is placed on the crop cart and the crop is cut and falls.An arm, etc. for holding the clog can be installed on the cutting machine body. It has the characteristics that it is not necessary at all.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of conventional crop cutting, Figures 2 and 6 are
The figures are a plan view and a front view showing the vicinity of the cutting machine for explaining the present invention, FIG. 4 is an explanatory view showing the cutting torch portion, and FIG.
The figure is an explanatory diagram showing the cutting method of the present invention. 1 is the cutting machine body, 6 is the slab, 5 is the clamp device,
6 is a torch carriage, 7 is a cutting torch, 8 is a drive device, 9 is a carriage rail, 12 is a clog truck, and 15 is a kerf. Figure 3 Figure 5 (a) 41i

Claims (1)

[Claims] Gas cutting machine for cast slabs that are continuously left behind and transported? In the crop cutting method, in which the crop is cut off at a predetermined position by moving in synchronization, cutting is interrupted by leaving a part of the crop uncut after the start of crop cutting, and then cutting gas is intermittently ejected to adjust to the bending of the slab. A crop cutting method in a T-continuous casting gas cutting machine, characterized in that a single cut groove is created, and when the slab moves to a predetermined position, the crop is cut by starting cutting again.