JPH0147274B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting machine for steel materials.

The cutting speed when gas cutting steel products manufactured by continuous casting process etc.
℃, it is necessary to carry out the process at a relatively low speed.
The reason for this is to sufficiently oxidize the slag generated when cutting the steel material to make it difficult to adhere to the lower end of the cut surface of the steel material, and to make it into pumice-like form so that it can be easily crushed.

By the way, in recent years, there has been a demand for improved casting speed in order to save energy and improve production efficiency.
This has created a need to increase both the transport speed of the steel material and the cutting speed of the steel material compared to the past, but in order to increase the speed of gas cutting, the removal of slag has become the bottleneck. This is because when the gas cutting speed is increased, the slag is not sufficiently oxidized, and as a result, it becomes welded to the lower end of the cut surface in a strong, so-called metallic state, making it difficult to remove. If such metallic slag remains, it can cause scratches on the conveyance roller during the transportation process of the steel material after cutting, scratches on the rolling roller during the rolling process, and may even get caught in the steel product itself. This results in the formation of scratches.

This invention was devised against this background, and includes a blowpipe for cutting steel materials,
A melting nozzle that melts and scrapes off the slag attached to the cut surface of the steel material cut by this blowpipe (hereinafter referred to as melt removal) is arranged on the same plane,
Moreover, by supporting each member so that they can move in the cutting direction of the steel material, slag can be sufficiently removed even when the cutting speed of the steel material is increased, and the gas cutting of steel material does not cause any problems during the steel material transportation process after cutting. The purpose is to provide a machine.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

What is indicated by the reference numeral 1 in FIGS. 1 and 2 is a gas cutting device, and this gas cutting device 1 includes a conveying mechanism 4 that conveys a steel material 8 by rollers 2 arranged at an appropriate distance. , rails 5 provided on both sides of the transport mechanism 4 along the transport direction,
5, the steel material 3 is movably supported via wheels 6, 6 driven by a drive source (not shown).
Above the direction perpendicular to the transport direction (hereinafter referred to as
an underframe 8 provided with a guide 7 in the direction (referred to as the cutting direction);
At both ends of the guide 7 of the underframe 8, there are provided cutting mechanisms 10, 10 which are movably supported via a saddle 9 having a built-in pinion that meshes with a rack (not shown) formed on the guide 7. .

The cutting mechanism 10 supports a blowpipe 12 with a downwardly directed blowpipe 11 that spouts cutting flame by a cylinder 13 held by the saddle 9.
The vertical distance between the steel material 3 and the crater 11 can be adjusted, and the crater 11 can be moved along the guide 7 by a saddle driving motor 14 provided at the top of the saddle 9.

Further, a bracket 15 extending downward is fixed to the right end of the guide 7 of the underframe 8 in FIGS. ) A slag removal device 20 that dissolves and removes the slag 16 attached to the
is held movably in the cutting direction.

This slag removal device 20 includes a cutting nozzle 21 that moves the lower side (back side) of the steel material 3 in the cutting direction;
It is equipped with a blow-up prevention nozzle 22 which is disposed oppositely above the fusing nozzle 31 and moves in the cutting direction on the upper side (surface side) of the steel material 3, and the fusing nozzle 21 prevents fusing flame ignition. It is attached to the tip (end on the steel material 3 side) of a moving rail 25 supported movably in the cutting direction by a guide roller 24 fixed to the bracket 15, with the spouting crater 23 facing upward. The blow-up prevention nozzle 22 is a sliding member that is slidably supported in the cutting direction by a slide guide 27 fixed to the bracket 15 with the air outlet 26 that blows out high-pressure air facing downward. It is attached to the tip of the tube 28 (the end on the steel material 3 side). The moving rail 25 and the sliding tube 28 are connected to each other at their rear ends by a connecting member 29, and the moving rail 25 is moved by a rail driving motor 30 provided on the guide roller 24. According to
The fusing nozzle 21 and the blowout prevention nozzle 22
I try to move around at the same time.

The blowpipe 12 of the cutting mechanism 10 and the fusing nozzle 21 and blow-up prevention nozzle 22 of the slag removal device 20 are arranged in the same vertical plane.

Hereinafter, a case will be described in which the present invention is used to cut a steel material during a continuous casting process or the like.

First, the underframe 8 is placed on standby at a predetermined position A (hereinafter referred to as standby position A) shown in FIG. 3a. At this time, the cutting mechanisms 10, 10 supported by the guide 7 of the underframe 8 are kept waiting at positions at both ends of the guide 7 (origin position B in FIG. 1).
Next, the tip of the steel material 3, which is transported in the direction of arrow A by the transport mechanism 4, advances a predetermined distance from the standby position A.
When the predetermined position C is reached, the underframe 8 is caused to follow the steel material 3 at a constant speed, and the saddle drive motor 14 is activated.
is operated to move the respective cutting mechanisms 10, 10 in the direction of arrow B to start gas cutting. As shown in FIG. 3b, when each of the cutting mechanisms 10, 10 moves to the center of the steel material 8, one of the cutting mechanisms 10 (the left cutting mechanism 10 in FIG. 1) immediately returns to the origin. Return to position B,
The other cutting mechanism 10 cuts the steel material 8 by slightly passing the center of the steel material 3 and then returning it to the origin position B.
This is to avoid leaving an uncut part in the center of the cutout. Next, as shown in FIG. 3c, when the respective cutting mechanisms 10, 10 are returned to the origin position B, the rail drive motor 30 is operated to move the cutting mechanisms 10, 10 from the origin position D shown in FIG. Slag removal device 2 was moved to preheating position E and was on standby.
0 in the direction of arrow C to begin dissolving and removing the slag. The operation of this dissolution removal is shown in Figure 4 a and b.
As shown in FIG. 2, the slag 1 attached to the lower end of the cut surface of the steel material 3 is
6 is melted and scattered, and the scattered slag 16a is dropped downward by high pressure air 32 jetted from a blow-up prevention nozzle 22. Then, the fusing nozzle 21 is moved to the fusing completion position F shown in FIG. 1, and when the fusing is completed, the slag removal device 2
0 to the origin position D, the underframe 8 is returned to the standby position A, and the steel material 3' from which slag has been removed is quickly transported by the transport mechanism 4 so as not to hinder the transport of the subsequent steel material 3. . Thereafter, the cutting and slag removal operations are repeated in the same manner.

Note that during the cutting and slag removal operations, the rollers 2 of the conveying mechanism 4 located in the moving direction of the cutting mechanism 10 and the slag removing device 20 are
0 and the slag removing device 20 are retracted downward so as not to cause any trouble.

Furthermore, in this embodiment, the steel material 3 is cut by moving the two cutting mechanisms 10 so as to sandwich it from both sides, but one cutting mechanism 10 is moved back and forth by the width of the steel material 3. Alternatively, the saddle and moving rail 25, which are driven by a motor, may be driven by a hydraulic cylinder or the like.

Further, in the above embodiment, the slag removing device 20 melts and removes the slag after returning the cutting mechanisms 10, 10 to the origin position B, but the cutting mechanisms 10, 10 remove the steel material 3 It is also possible to start dissolving and removing the slag when the cutting is finished.

As explained above, the present invention includes an underframe that is movable along the moving direction of the steel material at a speed equal to the moving speed of the steel material; a blowpipe that is movably supported and ejects a cutting flame onto the surface of the steel material; a cutting nozzle that ejects a cutting flame to remove slag adhering to the back side of the steel material, and a spout that blows air toward the steel material side, are provided on the underframe and located on the front side of the steel material,
and a blow-up prevention nozzle that moves together with the melt cutting nozzle,
The cutting flame ejected from the cutting nozzle can melt and scatter the slag attached to the back side of the steel material along the gas cut surface, and the air ejected from the blow-up prevention nozzle can reduce the amount of slag that is scattered. can be thrown away from the back of the steel material. As a result, the slag that has been melted and scattered can be reliably removed without adhering to the steel material again. Therefore, even if the cutting speed of the steel material is increased, the slag can be removed sufficiently, and therefore, during the process of transporting the steel material after cutting, the transport mechanism and other items are prevented from being damaged by the slag adhering to the cut surface of the steel material. This has the advantage that there is no problem, and the cut surface can be cut cleanly. Moreover,
Since the cart is equipped with a blowpipe and a cutting nozzle, the slag can be removed by cutting before the heat from cutting escapes and the temperature of the steel material drops, reducing the amount of heat required for cutting. Can be done. Further, since the steel material can be cut and the slag removed while the steel material is being transported, the steel material can be cut and the slag removed continuously and efficiently.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is a plan view, and FIGS. 3A to 3E are explanatory diagrams of each process, and FIGS. 4A and 4B are explanatory diagrams of the fusing nozzle. 1... Gas cutting device, 3... Steel material, 4... Conveyance mechanism,
10... Cutting mechanism, 11... Crater, 12... Blowpipe, 16
... Slag, 20... Slag removal device, 21... Cutting nozzle, 22... Blow-up prevention nozzle, 23... Crater.

Claims (1)

[Scope of Claims] 1. An underframe that is movable along the moving direction of the steel material at a speed equal to the moving speed of the steel material, and a support that is provided on the underframe and is movable in a direction intersecting the moving direction of the steel material. a blowpipe that is installed on the underframe and is supported movably in the moving direction of the blowpipe on the back side of the steel material, facing the blowpipe, and that is mounted on the back surface of the steel material; a cutting nozzle that blows out a cutting flame that cuts the adhered slag; and a jet outlet that blows out air toward the steel material, which are located on the surface side of the steel material and are provided on the underframe;
A gas cutting machine for steel material, comprising a blow-up prevention nozzle that moves together with the melt cutting nozzle.