JPS583775A - Gas cutter - Google Patents

Abstract

PURPOSE:To prevent cambers of cutting materials and to remove burrs surely by heating both side surfaces of a slab just prior to the gas cutting of the slab, sandwiching the cut slab with pinch roller devices and deburring the same. CONSTITUTION:A slab 3 is regulated to transverse positions by guide rollers 4, 5 and both side surfaces of the slab 3 are heated with heating nozzles 7, after which the cutting with torches 10 is started. This makes it possible to prevent both side surfaces from cambering. When detectors 18 detect the leading end part of the slab 3, pinch rollers 13 descend to sandwich the slab 3 with lower rollers. Upon detection of detecting bars 23, preheating is started prior to deburring and burrs are removed by scarfing nozzles 22 under ejection of scarfting oxygen. When detectors 19 detect the top of the slab 3, the pinch rollers in the rear part of a device 15 descend to sandwich the slab 3. Since the transverse deviation of the slab 3 is prevented by the devices 12, 15, the burrs are thoroughly removed.

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,
In order to produce billets, the vertical direction (longitudinal direction) of the slab
For example, divide it into two parts using a gas cutting machine.

A method is adopted in which the desired size, bloom, and billet are obtained by dividing into three or four parts. Conventionally, such a scrap cutting machine that splits slabs in the longitudinal direction has a horizontal frame that straddles the slab in the width direction mounted on a frame that runs in the longitudinal direction of the slab, and a cutting torch is movably suspended on the horizontal frame. What has been done is known.

In the gas cutting process using the above-mentioned gas cutting machine, the cut burr is welded to the lower surface of the slab, so it is necessary to remove the cut burr. Conventionally, Z IJ removal is performed on one side at a time, which is inefficient and results in a large loss of time. For example, when a slab is divided into three parts as shown in Fig. 1, the heat during cutting is applied only to one side when the material on both sides is 1°r.
It causes distortion in the curvature toward the outside, causing lateral warpage, which has a negative impact on subsequent processes. Note that since heat is applied to the cut material 2 at the center 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 chips, prevent lateral damage, 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 hole 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 rollers. This allows the deburring device to reliably remove deburrs as the slab progresses 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 the conveyor roller table, 4 a reference side guide roller, which 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 the pusher 6; 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 frame 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); X10 is a cutting torch suspended from each cutting torch cart 9; , 11 is a detector installed on the front surface of the cutting machine mount 8 for detecting the tip end face of the slab 3 and starting 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. Use a cylinder on the stand.

Reference numeral 15 denotes a rear pinch roller device installed at a distance from the front pinch roller device 12, and its configuration is partially the same as that of the pinch roller device 12, and consists of a pinch roller 16 and a holding table 17. In addition, 18.19 is the holding stand 14 and 1
This is a slab detector installed on the front of 7. Incidentally, since the respective pinch rollers 13 and 16 are used to pinch the slab 3 as necessary as shown in FIG. 4, it is preferable that their positions correspond to the positions of the rollers of the conveying roller table.

Next, additional 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 extends along the rail 21 in the slab conveyance direction. It is configured to move forward and backward. n is a solvent vent of the deburring device, which is installed on the slab cutting line; ``a'' is an L-shaped detection bar installed on the top of the deburring device so that it can be raised up and down by a motor, etc., and 5 fixes the deburring device 20. It is a clamp device. When the detection bar 23 is upright, 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 in front of 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 a detector 11, and the cutting operation is started using a 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 a heating fire lower. When the cutting progresses and the dog portion of the slap 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 and the third
As shown in the figure, the slab 3 is held together with the lower roller. This is to prevent the material to be cut from meandering and to avoid affecting the deburring process using a solvent using the best method.

The signal from the detector 18 is also sent to the drive section 24 of the deburring device, which raises the detection bar 23 as shown in FIG. 3 and brings it into contact with the end surface of the slab 3. When slab 3 collides with the tip of detection bar B (position B in Figure 3), preheating point B of the slab
' exactly coincides with the preheating point of the paring crater 22, and the preheating position is automatically determined. In this state, a preheating operation is started prior to deburring the slab 3, and the deburring device itself runs on the rail 21 in synchronization with the moving speed of the slab via the detection bar. In this case, for example, if the preheating time is 15 seconds and the cutting speed is 1000 ttts/m, the dimension t in FIG. 3 will be 2501 ml+. The preheating time is set in advance with a timer, etc., and at the same time as the time is up, the detection bar 23 retreats in the R direction, the deburring device loses its moving power and stops, and the slab 3 advances through the soil of the solvent crater n. go. At the same time as the detection bar is retracted, solvent oxygen is ejected to remove deburrs, but the deburr device is fixed with a flang device 5 so that the head of the deburrer does not succumb to the resistance of the solvent.

Next, when the top of the slab 3 passes the detector 19, the roller 16 of the rear pinch roller device 15 descends and pinches the slab in the same way as the front pinch roller, completely preventing the slab from shifting in the lateral direction (the first Figure 4).

When the cutting of the material to be cut is completed, the bottom of the material is detected by the detector 18.
When passing through, a release signal for the front pinch roller device 12 is sent and a count to stop the deburring solvent is started, and when the set count is reached, the solvent is stopped and the deburring is completed. ,! In addition, the material bottom is the next detector 1.
9, a release signal for the rear pinch roller device 15 is sent, and the pinch row 216 is raised. When the deburring device I finishes dissolving the solvent, it returns to the original position PK shown in FIG.

In the above explanation, an example of cutting the slab into three parts was shown, but of course the present invention can also 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 - pieces of material to be cut into pieces in the longitudinal direction, cutting can be performed reliably without stopping the material being transported. Since the deburring work can be performed immediately after the start of the cutting work, 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 the drawing]

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;
Figure 3 is a preheating state diagram due to slab end face detection ζ-operation.
FIG. 4 is a phase diagram of the deburring solvent. 3...Slab, 4...Reference side guide a-7, 5
...Moving side guide roller, 6...Grudge, 7
... Heating disaster area, 8... Cutting machine mount, 9... Cutting torch trolley, lO... Cutting torch, 11.18.19.
...Detector, 12...Front pinch roller device, 13
．． 16... Bin f o -7, 14° 17... Holding stand, 15... Rear pinch roller device 207T 7 (
Clearing device, n... deparative solvent crater, o... detection) (-〇 Patent applicant Representative patent attorney Tomoyuki Ya Fuki (and 1 other person)

Claims (1)

[Claims] In a gas cutting device having a gas cutting torch that vertically traverses an arbitrary number of materials to be cut, which are transported in the longitudinal direction on a transport row 2 table, a heating vent is provided upstream of the cutting torch to heat both sides of the materials to be cut. A front pinch roller device and a rear pinch roller device, which 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, and between the front and rear pinch roller devices. 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 in the conveyor.