JPS58173062A - Cutting method of crop in gas cutter for continuous casting - Google Patents

Abstract

PURPOSE:To prevent second cutting of an ingot while the ingot is held disengaged from the cutting groove in the interruption stage of cutting by interrupting the cutting so as to leave a partly uncut part after starting cutting of a crop and moving the ingot to the prescribed position then moving a cutting torch backward by a set extent. CONSTITUTION:The cutting of an ingot 3 conveyed with a roll table 2 is started and when the uncut part attains a specified length, a torch carriage 6 is stopped to interrupt the cutting temporarily. When the ingot 3 and a body 1 are moved to the position where a crop carriage 12 is installed, the ingot 3 is bent by the oscillation or the like during the movement and the end part of the cutting groove 15 of the ingot 3 and the position of a cutting torch 7 are deviated by a distance l. A limit switch 13 for position detection operates upon moving of the ingot 3 and the body 1 over the carriage 12. The carriage 6 moves the torch 7 backward by the preset distance l during the movement of the body 1. The torch 7 is thus located in the upper part of the end part of the groove 15 of the ingot 3 and resumes cutting the crop in accordance with the signal of the switch 13, thereby dropping the crop onto the carriage 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting the top (1) crop or test piece of a continuously cast long slab, and more particularly to a method for cutting a top (1) crop or test piece of a long slab that is continuously cast. When moving the slab with uncut parts left uncut and re-cutting the remaining part at a predetermined position to collect crops, etc., the center of the cutting torch may come off from the kerf groove at the time of interruption of cutting due to the 11II of the slab. The present invention relates to a crop cutting method that prevents re-cutting from being started.

Continuously cast slabs (hereinafter referred to as slabs) are produced by rolling high-temperature molten metal with rolling rolls and cutting the slab into appropriate lengths with a cutting device. The quality of these slabs varies depending on the distribution of non-gold maple substances contained in the bath molten metal, and the tip of the slab is cut and collected as a test piece for the purpose of inspecting the inside of the slab. is commonly practiced.

When cutting from a crop or a test piece k
Slab υ) A part of the uncut part is provided in the cutting width direction, and the crop is connected to the slab by this part and transported from 1 frame to the crop trolley position, and re-cutting is started on the crop trolley to completely remove the uncut part. A method of cutting and dropping the crop onto a crop trolley has been developed. 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 bloom, the uncut portion is cut in the VC first stage as shown in Fig. 1 (as shown in Fig. a1). Cutting is temporarily stopped leaving small fibers in part C, and the cutting machine body and slab a
When the slab a is conveyed to the cropping cart position in synchronization, the vibration during conveyance or the temperature difference between the outside and inside of the slab may cause the slab a to
It's a twist. As a result, as shown in figure (b) J
There is a gap (3) between cutting torch b and the end point of cutting the slab. It is not on the kerf, but on the uncut slab. Therefore, if re-cutting is started in the state shown in Fig. b1, there will be a piercing condition f, the slag will blow up, etc., and the cutting torch a will suffer from bath loss.

The present invention relates to a completely new technique that improves the drawbacks of the conventional 2nd class type.

An embodiment of the present invention will be explained with reference to figures.
In the figure, a) gas cutting machine main body, which cuts six slabs transported by a 1Q roller table 2, has a machine drive device 4 at the rear, and three slabs at the bottom.
A clamping device 5 is provided which can move the main body 1 in synchronization with the slab 6 by pressing a claw on it. The first roller is a muni-torch carriage installed in the front part (4) of the main body 1, which is equipped with cutting torches 7Y-KL, and a drive unit #8 incorporating a motor and a clutch, and a cleaning device installed on the carriage rail 9. It is movably installed. Reference numeral 10 denotes a device for detecting the cut end face of the slab 6 cut by the cutting torch 7. The main body 1 can run along a running rail 11 in the same direction as the cast slab, and the lower part V- at the front of the running rail 11 is provided so that a cropping trolley 12 can move in the direction intersecting the casting line. A position detection limit switch 16 that is activated when the cutting machine main body 1 and slab 6 are moved onto the cropping cart 12 is provided at the position.

When cutting and collecting crops using the Muni device configured as described above, the explanation will be given with reference to Fig. 5. First, a 6-ton slab is continuously cast and is generally fed from the roller table 2 T/C (5). Clamped by the device 5, the main body 12 is moved in synchronization with the slab 6, and the end m1 of the slab 6 is detected by the IM weighing detection 10, and the slab 3 is
Start cutting the crop 14 at the tip.

Then, the uncut portion has a certain length (approx. 50111) as shown in the figure (a). Stop 1-4). Next, in this state, when moving to the position where the slab 6 and the main 1+1 crop cart 12 are installed, the vibration between them, tl
! Due to the degree difference, etc., the slab 6 begins to bend as shown in Fig. fb1, and the end of the kerf 15σ) of the slab 3 and the position 111 of the cutting torch 7 are misaligned by a distance p#/j. The slab 6 and the main body 1 are transferred onto the crop cart 12! When I is selected, the cropping cart 12VC is matched and the FF output limit switch 13 is activated. During the movement of the main body 1, the torch key ridge (6) 6 moves the cutting torch 7 backward by a predetermined distance l.As a result, the cutting torch 7 cuts the slab as shown in Figure 0. It is located above the end of the cut groove 15 of the filter, and from this state, re-cutting is started by the activation signal of the limit switch 13 to completely cut off the crop 14, and the crop 14 is dropped onto the crop cart 12. It is something that makes you

Note that the value of the distance l, which is the return distance of the cutting torch 7, is
Since the amount of bending of the slab 6 changes depending on the steel type, plate thickness, cutting i1, and crop length, there are settings to be made according to the amount of bending, and the setting of the return hem is based on ties, - This method may be performed by combining the return speed of the carriage A or the return speed of the carriage B, or by calculating the return amount using a pulse generator.

(7) As mentioned in AJJ, when cutting the cast slab, the present invention measures the length of the cast slab, interrupts the q1 cutting, moves the cutting table to the east, and then moves the cutting torch to the curved slab of the cast slab. Return the cutting torch by a distance according to It is possible to completely prevent the piercing condition caused by misalignment between the cutting torch and the kerf when the cutting starts, and to cut the crop smoothly without the cutting torch being biased. In order to perform cutting on city land, there is no need to provide an arm or the like on the cutting machine body to hold the cut wood chips after cutting.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of one place of conventional crop cutting, Fig. 2 (8) and Fig. 6 are a plan view and a front view showing the vicinity of the cutting machine to explain the present invention, and Fig. 4 is a section of the cutting torch. FIG. 5 is an explanatory diagram of the cutting method of the present invention. 1 is the cutting machine main body, 3 is the slab, 5 & e-clamp device, 6 & etorchi gear mechanism, 7 is the cutting torch, 8 is the drive device, 9 is the carriage rail, 10 (
12 is an eclipse cart, and 15 is a cutting groove. Patent applicant: Koike Sanso Kogyo Co., Ltd. (9) No. 1 (a) No. 2 (b)

Claims (1)

[Claims] In the crop cutting method, in which a gas cutter is moved synchronously with the continuously cast slab to cut off the crop at a predetermined position, cutting is interrupted with some uncut portion left after the beginning of the cutting, and the slab is cut off. A continuous casting gas cutting machine characterized in that after moving to a predetermined position, the cutting torch is moved backward by a set amount, the cutting torch is moved onto the kerf groove of the slab, and re-cutting of the crop is started to cut the crop. Crop cutting method in .