JPS5938869B2 - gas cutting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas cutting device for vertically cutting a slab material into two or more parts.

In recent years, in steel plants, blooming,
To create a billet, the longitudinal direction of the slab
A method is adopted in which the material is divided into two, three or four parts using a gas cutting machine to obtain a bloom or billet of a desired size.

Conventionally, gas cutting machines that perform such vertical division of slabs have a horizontal mount that straddles the slab in the width direction mounted on a mount that runs in the longitudinal direction of the slab, and a cutting torch is movably suspended on the horizontal mount. What has been done is known. In the gas cutting process using the gas cutting machine described above, cutting burrs are welded to the lower surface of the slab, so it is necessary to remove these burrs.

Conventionally, deburring is done on one side at a time, which is inefficient and results in a large loss of time. For example, if a slab is divided into three parts as shown in Figure 1, the heat during cutting will be transferred to the material 1 on both sides
1', since it is applied only to one side, it causes distortion in the curvature toward the outside and causes lateral warp, which adversely affects the subsequent process. Incidentally, since the cut material 2 at the center is exposed to heat from both sides, almost no distortion occurs due to heat. SUMMARY OF THE INVENTION An object of the present invention is to provide a gas cutting device that can efficiently remove the above-mentioned cutting burrs, prevent warpage in the lateral direction, and perform smooth cutting operations. To achieve this object, the present invention provides a gas cutting device including a gas cutting torch that vertically traverses an arbitrary number of slabs conveyed longitudinally on a conveying roller table. A heating port for heating both sides is provided, and a front pinch roller device and a rear pinch roller device that can freely pinch slabs and are movable up and down are arranged at intervals downstream of the cutting torch, and the front and rear pinch roller devices are arranged at intervals. A cutting deburring device that can move synchronously with the slab over a certain distance is installed on the lower surface of the slab conveyor between the rear pinch roller devices. In the present invention, by heating both sides of the slab with a heating crater immediately before cutting the slab with gas, thermal distortion of the cut material is eliminated and warpage is prevented, and the slab after cutting is held between the pinch roller devices. The burr can be reliably removed as the slab progresses by the burr removing device while preventing the slab from shifting.

The present invention will be explained below based on embodiments shown in the drawings.

In FIG. 2, reference numeral 3 denotes a material to be cut, such as a slab, which is conveyed in the direction of the arrow on a conveyor roller table, 4 is a reference side guide roller that regulates the lateral position of the slab 3 before it enters the cutting zone, and 5 7 is a movable side guide roller that can press the slab 3 against the reference side guide roller 4 by the action of a pusher 6, and 7 is the side guide roller 4.
.

In addition, 8 is a cutting machine mount installed so as to straddle the slab 3;
Reference numeral 9 denotes a cutting torch cart mounted on the stand 8 and movable in the width direction of the slab (the figure shows an example of dividing the slab into three, so two units are provided); 10 a cutting torch suspended from each cutting torch cart 9; A torch 11 is a detector provided on the front surface of the cutting machine mount 8 to detect the tip end face of the slab 3 and start the cutting operation.

Note that other equipment necessary for the gas cutting operation of the slab is well known and will therefore be omitted. Furthermore, 12 is a front pinch roller device installed close to the downstream side (viewed from the flow of the slab) of the cutting machine mount 8, and this device is, for example, a pinch roller having an axis in the width direction of the slab 3. 13, and a holding table 14 that holds the pinch roller 13 so that it can move up and down between a position where it contacts the slab and an upper position where it does not come in contact with the slab. 2 cylinders, etc.).

Reference numeral 15 denotes a rear pinch roller device installed at a distance from the front pinch roller device 12. Its configuration is the same as that of the front pinch roller device 12, and is composed of a pinch roller 16 and a holding table 17.

Further, 18 and 19 are slab detectors provided in front of the holding tables 14 and 17. In addition, each pinch roller 13
, 16 are used to clamp the slab 3 as required, as shown in FIG. 4, and therefore their positions preferably correspond to the positions of the rollers of the transport roller table. Next, 2
0 is a deburring device disposed below the slab conveyance line between the front pinch roller device 12 and the rear pinch roller device 15 described above, and the deburring device 20 is movable back and forth in the slab conveyance direction along the rail 21. It is configured.

22 is a solvent nozzle of the deburring device, which is installed on the slab cutting line; 23 is an L-shaped detection bar provided on the deburring device 20 so as to be able to stand up and fall down by a motor 24; and 25, the deburring device 20 is fixed. It is a clamp device.

When the detection bar 23 is standing up, it comes into contact with the top end surface of the slab 3, as shown in FIG. 3, and when it falls down, it is in a state where there is no hindrance to the movement of the slab 3, as shown in FIG. The operation of the apparatus according to the embodiment of the present invention described above will be explained below.

When the slab 3 is transported in the direction of the arrow and reaches a predetermined position before the cutting position, the pusher 6 is activated to push out the movable side guide roller 5 and press the slab 3 together with the reference side guide roller 4.

The tip of the slab 3 is detected by the detector 11, and the cutting operation is started using the cutting torch 10 set in advance on a predetermined longitudinal section line, and at the same time, both sides of the slab 3 are heated by the heating nozzle 7. When the cutting progresses and the top portion of the slab 3 passes the detector 18, a signal is sent to the mechanism for raising and lowering the pinch roller 13 of the front pinch roller device 12, and the pinch roller 13 is lowered, as shown in FIG. The slab 3 is clamped together with the lower roller. This is to prevent the material to be cut from meandering and to minimize the effect on the subsequent deburring process using a solvent. The signal from the detector 18 is also sent to the drive unit 24 of the deburring device 20, which moves the detection bar 23 to the third
Stand it up as shown in the figure and bring it into contact with the end face of the slab 3.

When the slab 3 collides with the tip of the detection bar 23 (position B in Fig. 3), the preheating point B' of the slab is exactly at the deburring crater 22.
The preheating position is automatically determined. In this state, a preheating operation is started prior to deburring the slab 3, and the deburring device 20 itself runs on the rail 21 in synchronization with the moving speed of the slab via the detection bar 23. In this case, for example, the preheating time is 15 seconds and the cutting speed is 1000.
If mn/Min, the dimension of l in Figure 3 is 250m7
7! becomes. The preheating time is set in advance using a timer or the like, and at the same time as the time is up, the detection bar 23 retreats in the R direction, the deburring device 20 loses its moving power and stops, and the slab 3 advances over the solvent crater 22. Go. Simultaneously with the retraction of the detection bar 23, solvent oxygen is ejected to remove burrs, but the deburring device 20 is fixed with a clamp device 25 so as not to succumb to the resistance of the solvent. Next, when the top of the slab 3 passes the detector 19, the rear pinch roller device 15
The rollers 16 descend and pinch the slump in the same way as the front pinch rollers, completely preventing the slab from shifting in the lateral direction (FIG. 4).

When the cutting of the material to be cut is finished, the bottom of the material is detected by the detector 18.
, a release signal for the front pinch roller device 12 is sent and a count is started to stop the deburring solvent, and when the set count is reached, the solvent is stopped and deburring is completed. Also, the material bottom is the next detector 19.
When the rear pinch roller device 15 passes, a release signal is sent to the rear pinch roller device 15, and the pinch roller 16 is raised. Deburring device 2
0 returns to the origin position P in FIG. 3 when the solvent is completely removed.
In the above explanation, an example of cutting the slab into three parts was shown, but of course the present invention can be implemented in the case of cutting the slab into two or four or more parts, and the material to be cut may also be a metal material other than the slab.

As described above, according to the gas cutting device of the present invention, when cutting individual pieces of material to be cut into pieces in the longitudinal direction, cutting can be performed reliably without stopping the material being conveyed, and the cutting operation can be easily performed. Since deburring work can be performed immediately after starting, efficiency can be significantly improved compared to conventional deburring work.

Further, it is possible to prevent horizontal warping of the material due to heat during gas cutting by heating both sides of the material at the heating nozzle at the same time as cutting.

[Brief explanation of drawings]

FIG. 1 is a cutting state diagram showing lateral warping that occurs when longitudinally cutting a slab; FIG. 2 is a plan view showing an apparatus according to an embodiment of the present invention;
FIG. 3 is a diagram showing the state of preheating by the operation of the slab end face detection bar, and FIG. 4 is a diagram showing the state of the deburring solvent. 3...Slab, 4...Reference side guide roller, 5
...Moving side guide roller, 6... Pusher, 7
... Heating crater, 8... Cutting machine stand, 9... Cutting torch trolley, 10... Cutting torch, 11, 18, 19.
...Detector, 12...Front pinch roller device, 13,
16... Pinch roller, 14, 17... Holding stand, 1
5... Rear pinch roller device, 20... Deburring device, 22... Deburring solvent nozzle, 23... Detection bar.

Claims (1)

[Claims] 1. In a gas cutting device having a gas cutting torch that longitudinally traverses an arbitrary number of materials to be cut that are transported in the longitudinal direction on a transport roller table, a heating vent that heats both sides of the material to be cut is provided on the upstream side of the cutting torch. A front pinch roller device and a rear pinch roller device that can freely hold the material to be cut and are movable up and down are arranged at intervals on the downstream side of the cutting torch. A gas cutting device characterized in that a cutting deburring device that can move in synchronization with the material to be cut is installed on the lower surface of the material to be cut conveying the material to be cut.