JP2000117318A - Descaling device for bar steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a descaling device for billets with which secondary scale is removed without generating cracks and wrinkles in a corner part. SOLUTION: The descaling device which is arranged on the inlet side of each rolling mill train is constituted of a mechanical descaling device which is arranged on the side of a transporting machine for a billet W and a water jet type descaling device 7 which is arranged on the side of the rolling mill train. Six divided headers 71a having water jetting nozzles 72 of the water jet type descaling device 7 are annularly arranged and, when each divided header 71a is supported approachably and separably to the billet W with actuators 73, the quantity of the jet water which is jetted from the water jet nozzles 72 is reduced by the combination of the mechanical descaling device and the water jet type descaling device 7 and approach of the divided headers 71a, so the secondary scale is removed from the billet W without generating the cracks and wrinkles in the corner parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a strip steel scale removing device which is installed in a strip rolling equipment and removes secondary scale generated on the surface of the strip during hot rolling.

[0002]

2. Description of the Related Art Generally, in a strip rolling mill, a water-jet type scale removing apparatus having a plurality of water jet nozzles for jetting high-pressure water to remove secondary scale generated on the surface of the strip from the strip is provided. . FIG. 5A and FIG. 5A which are schematic structural explanatory views of this water jet type scale removing device.
As shown in FIG. 5 (b) of a cross-sectional view taken along the line AA of FIG. 5, a header 101 formed in an annular shape, and disposed inside the header 101 and centered in the radial direction of the header 101. And a plurality of water injection nozzles 102 for injecting high-pressure water toward the surface of the strip W.

[0003] By using a water jet type scale removing device having such a configuration, heating is performed by a heating furnace (not shown).
When removing secondary scale generated during rolling by the strip rolling mills of each row of strip rolling mills from the surface of the strip steel W, the water injection nozzle 1 of the water injection type scale removing device 100 is used.
High-pressure water with a pressure of 3 to 5 MPa from 02 is injected.

[0004]

By the way, when the bar steel is a billet which is a base material of the wire rod, immediately after being extracted from the heating furnace, if the amount of high-pressure water injected from the water injection nozzle is increased, the secondary scale is increased. Removal efficiency is improved,
Since the amount of heat removed is large, the corners of the billet are too cold, causing problems such as cracks and wrinkles at the corners, so that the amount of high-pressure water spray can be increased. Therefore, there was a problem to be solved that the secondary scale could not always be sufficiently removed from the billet (an indentation occurred on the surface of the rolled product).

On the exit side of the rough rolling mill row and the intermediate rolling mill row, the billet becomes too thin and too cold due to the rolling by the rolling mills constituting the rough rolling mill row and the intermediate rolling mill row. In addition, there is a problem to be solved in that the amount of high-pressure water injected from the water injection nozzle cannot be increased, and the secondary scale cannot always be sufficiently removed from the billet.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a scale removing device which does not cause cracks or wrinkles in a corner portion of a billet and which can reliably remove a secondary scale even if the billet is thin. An object of the present invention is to provide an apparatus for removing scale of a bar in a bar rolling facility.

[0007]

Means for Solving the Problems In order to solve the above problems, the present inventors have used a water jet type scale remover and a mechanical scale remover in order to remove the secondary scale of the bar steel. A water jet nozzle of the water jet type scale remover is configured to be able to approach the steel bar through a header,
The present invention has been made on the assumption that the secondary scale can be removed from the steel bar by reducing the amount of high-pressure water injected from the water injection nozzle and increasing the water pressure, even if the amount of injected water is small.

[0008] Therefore, in order to solve the above-mentioned problems, the means adopted by the strip steel scale removing apparatus according to claim 1 of the present invention is provided on the entry side of the strip steel of each rolling mill row in the strip steel rolling equipment, In a bar removing device for removing secondary scale from the surface of a bar before being rolled by each rolling mill row, a header having a water injection nozzle for injecting high-pressure water toward the bar, and surrounding the bar. A water-jet type scale remover equipped with a mechanical scale that is disposed at a position in the vicinity of the steel bar transfer base side of the water-jet type scale remover and applies a pressing force to the surface of the steel bar to remove the secondary scale And a removing device.

According to a second aspect of the present invention, there is provided a strip steel scale removing apparatus in a strip steel rolling facility according to the first aspect, wherein the water jet type scale removing apparatus includes a plurality of headers. And the split header positioned outside the plane of the strip is supported so as to be able to approach and separate from the strip.

According to a third aspect of the present invention, there is provided a strip steel scale removing apparatus in a strip steel rolling facility according to the first aspect, wherein a plurality of headers of the water jet type scale removing apparatus are provided. And each of the divided headers is supported so as to be able to move toward and away from the bar, and a position detection sensor for detecting the position of the corner of the bar is provided. A header operating means for operating a split header located outside the plane of the strip based on a signal is provided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the configuration of a strip steel scale removing apparatus according to Embodiment 1 of the present invention will be described with reference to FIG.
And FIG. 2 of a schematic configuration diagram of a mechanical scale removing device constituting the scale removing device, and FIG. 3 of a schematic front configuration diagram of a water jet type scale removing device constituting the scale removing device. I will explain it.

Referring to FIG. 1, the outline of the strip steel rolling facility will be described. In the strip steel rolling equipment 1, a mechanical scale is provided on the entry side of a plurality of rolling mill rows to remove a secondary scale generated in a billet which is a strip steel being rolled by a heating furnace at the entrance of a plurality of rolling mill rows. A scale removing device including a removing device and a water jet type scale removing device is provided.

More specifically, a mechanical type for removing secondary scale of billet W extracted from the heating furnace 2 between the heating furnace 2 and a rough rolling mill row 3 in which a plurality of rough rolling mills are arranged in series. A scale removing device 5 including a scale removing device 6 and a water jet type scale removing device 7 is provided.
Further, a secondary scale of billet W generated during rolling by the rough rolling mill of the rough rolling mill row 3 is provided between the rough rolling mill row 3 and the intermediate rolling mill row 4 in which a plurality of intermediate rolling mills are arranged in series. A scale remover 5 having the same configuration as that of the mechanical scale remover 6 and the water-jet type scale remover 7 to be removed is provided, and an intermediate between the intermediate rolling mill row 4 and a finishing rolling mill row (not shown). A scale remover 5 of the same configuration including a mechanical scale remover 6 and a water jet type scale remover 7 for removing the secondary scale of the billet W generated during rolling by the intermediate rolling mill of the rolling mill row 4 is provided. ing.

First, the structure of the mechanical scale remover 6 constituting the scale remover 5 will be described. As shown in FIG. 2, the mechanical scale remover 6 has upper and lower surfaces of a billet W having a rectangular cross section. And a pair of left and right vertical pinch rolls 62 for pressing the left and right side surfaces of the billet W. While the secondary scale is removed from the surface of the billet W by the mechanical scale removing device 6 as described above, the secondary scale that has not been removed is partially peeled off due to the warpage of the edge, and is in a state of being very easily peeled. Become. The pinch roll of the mechanical scale removing device 6 may be, for example, any of a barrel type, a drum type, a groove type, a projection type, and a brush type, and includes a pair of upper and lower horizontal pinch rolls 61 and a pair of left and right vertical pinch rolls. The pinch roll 62 may be provided at a position shifted in the moving direction of the billet W. Further, the mechanical scale removing device 6 may be replaced with a press device having a pair of anvils, one for each of upper, lower, left and right, which applies a striking force from all directions by performing a piston movement on the surface of the billet W.

Next, the structure of the water-jet type scale removing device 7 constituting the scale removing device 5 will be described. As shown in FIG. A header 71 in which six curved headers 71a to which a high-pressure water of 10 MPa or more is supplied are arranged in an annular shape, and the headers 71 of the headers 71 are protruded in a state inclined to the billet W side of the headers 71a. And a billet W passing through the center of the header 71 in the radial direction.
And a plurality of water injection nozzles 72 for injecting high-pressure water from an oblique direction to the surface.

The diameter of the injection hole of the water injection nozzle 72 is set smaller than the diameter of the injection hole of the conventional water injection nozzle. By the way, in the first embodiment, the six divided headers 71a are formed in a curved shape while being curved, but these six divided headers 71a are straight and have a regular hexagonal shape. It may be arranged so that it becomes. By the way, the direction of the water injection nozzle 72 is oblique, but this is caused by the injection of water jetted from the water injection nozzle 72 between the surface of the billet W and the secondary scale, thereby separating the secondary scale. It is intended to improve the effect.

Each of the six divided headers 71a constituting the header 71 is formed by a billet W by an actuator 73 comprising a hydraulic cylinder, an electric jack or the like.
Is supported so as to be able to approach and separate from.
That is, the billet W is configured to be able to maintain an optimum distance for removing the secondary scale from the surface of the billet W. Thereby, regardless of the size of the billet W, the water injection nozzle 72 can be brought close to the billet W and held at an appropriate position, and the amount of high-pressure water injected from the water injection nozzle 72 is reduced. However, since the collision energy of the jet water can be increased, the secondary scale can be effectively peeled off from the surface of the billet W and removed.

The mode of operation of the strip rolling equipment having the above-described configuration will be described below. According to the strip rolling equipment 1, the billet W extracted from the heating furnace 2 is supplied to the mechanical scale removing device 6 and the water injection scale. The secondary scale is removed by the removing device 7, and the secondary scale is rolled by the rough rolling mill row 3 in which a plurality of rough rolling mills are arranged in series. Next, the billet W roughly rolled in each of the rough rolling mills of the rough rolling mill row 3 is subjected to removal of secondary scale by a mechanical scale removing device 6 and a water jetting scale removing device 7, and a plurality of intermediate rolling mills are provided. Are rolled by an intermediate rolling mill row 4 arranged in a series. And the billet W roughly rolled by each intermediate rolling mill of the intermediate rolling mill row 4
The secondary scale is removed by the mechanical scale remover 6 and the water jet type scale remover 7, and is sent to the finishing mill to be finish-rolled.

As described above, the secondary scale of the billet W is removed by the combined use of the mechanical scale remover 6 and the water jet type scale remover 7, so that the water jet nozzle 72 of the water jet type scale remover 7 is removed. The amount of high-pressure water sprayed from the nozzle is smaller than that of the conventional example in which the secondary scale is removed only by the water-jet type scale remover. Therefore, not only does the crack or wrinkle not occur in the corner portion of the billet W, but even if the billet W becomes thinner by rolling, the secondary scale is peeled and removed from the billet W with a small amount of high pressure water injection water. Can be.

Further, by reducing the collision energy of the jet water with the water jet nozzle 72 approaching the surface of the billet W, the secondary scale can be effectively removed from the billet W with a smaller amount of jet water. And the pressure of high-pressure water is 10 MPa or more,
A smaller amount of injection water may be required compared to the conventional example in which high-pressure water of Pa is injected, and the generation of cracks at the corners of billet W,
It is more effective in preventing the generation of wrinkles, and even if the billet W becomes thinner by rolling by a rolling mill row, it is possible to remove and remove the secondary scale from the billet W while preventing overcooling of the corner portion. it can.

By the way, the thickness of the secondary scale generated in the billet W is much thinner at the outlet side position in the rough rolling mill train 3 and the intermediate rolling mill train 4 than in the extraction position of the heating furnace 2. Therefore, the secondary scale could be removed only by the water jet type scale remover. This means
This suggests that the combined use with the mechanical scale remover can further reduce the amount of water sprayed from the water-jet type scale remover, and that the primary material has excellent quality without cracks and wrinkles at the corners of the billet W. It suggests that the product can be manufactured. Further, as described above, since the amount of heat removal can be gradually reduced, there is also an energy saving effect that the extraction temperature of the billet W from the heating furnace 2 can be lowered.

Description of the water jet type scale removing apparatus according to the second embodiment of the present invention will be given. FIG. 2 is a schematic front view showing a state in which a secondary scale of a billet conveyed in a horizontal and vertical diagonal line is removed. FIG. 4A and FIG. 4A, which is a schematic front configuration explanatory view showing a state in which a secondary scale of a billet conveyed in a horizontal position with a flat portion is removed.
This will be described with reference to FIG. However, the difference between the second embodiment and the first embodiment lies in the difference of the water-jet type scale removing device. Since the other components have exactly the same configuration, they have the same configuration and the same function. The same reference numerals are given and only different points will be described.

In the water jet type scale removing device 7 according to the second embodiment, the header 71 is composed of eight divided headers 71a, as can be clearly understood from comparison with FIG. All of the eight divided headers 71a are supported by the actuator 73 so that they can approach and separate from the surface of the billet W.

Then, according to a pass schedule signal from a host computer (not shown), the billet W is transported, that is, as shown in FIG. 4A, the diagonal line of the billet W is horizontal and vertical (the corners are vertically and horizontally). 4B), and even when the plane portion is conveyed in a horizontal posture, as shown in FIG. , And only the actuator 73 for operating the split header 71a having the water jet nozzle 72 for jetting high-pressure water to the flat portion of the billet W is operated, and the split header 7 is operated.
1a is brought close to the billet W, and a header operating means 75 for stopping the operation of the actuator 73 when the moving amount of the divided header 71a output from the position detection sensor 74 reaches a predetermined amount is provided.

Therefore, according to the water-jet type scale removing device 7 according to the second embodiment, the secondary scale of the billet W can be removed by using the same together with the mechanical scale removing device. The next scale removing effect is the same as that of the water jet type scale removing device 7 according to the first embodiment. However, a split header 71a having a water jet nozzle 72 for jetting high-pressure water to the flat portion of the billet W
Only the first embodiment can be brought close to the billet W, so that there is an advantage that the embodiment is superior to the first embodiment in preventing the generation of cracks and wrinkles at the corners of the billet W.

In the above, the case where the technical idea according to the present invention is applied to a rolling facility for rolling a billet has been described as an example. However, a disassembling rolling facility or a continuous rolling machine for producing bloom, which is a base material of the billet, is described. Since the present invention can also be applied to a casting facility, the scope of application of the technical idea of the present invention is not limited by the above embodiment.

[0027]

As described in detail above, claim 1 of the present invention
According to the strip remover for strip steel in the strip rolling equipment according to the present invention, the secondary scale is removed from the strip by using a water-jet type scale remover and a mechanical scale remover in combination, so the secondary scale can be obtained only with the water-jet type scale remover. The amount of water jetted from the water jet nozzle can be reduced as compared with the conventional example in which scale is removed. Therefore, the amount of heat removal is reduced, and the corner portion of the billet does not become too cold, so that cracks are generated in this corner portion,
No wrinkles are generated. Further, even if the billet W is thinned by rolling, the secondary scale of the strip can be effectively removed with a small amount of high-pressure water injection.

According to the strip steel descaling device in the strip steel rolling equipment according to the second aspect of the present invention, the water jet nozzle of the water jet type descaling device can be brought close to the plane of the strip steel through the split header. With a smaller amount of high-pressure water injection, the secondary scale of the bar can be removed while preventing the generation of cracks and wrinkles at the corners, and in the bar rolling mill according to claim 3 of the present invention. According to the strip steel scale removing device, regardless of the position of the corner portion of the strip steel, the split header having the water injection nozzle that injects high-pressure water onto the surface of the strip steel can be brought closer to the plane of the strip steel, Regardless of the conveying attitude of the bar, the secondary scale of the bar can be removed with a smaller amount of high-pressure water jetting water while preventing the generation of cracks and wrinkles at the corners.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a schematic line configuration of a strip steel rolling facility including a scale removing device according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration explanatory view of a mechanical scale removing device constituting the scale removing device according to the first embodiment of the present invention.

FIG. 3 is a schematic configuration explanatory view of a water-jet type scale removing device that constitutes the scale removing device according to the first embodiment of the present invention.

FIG. 4A relates to a second embodiment of the present invention, and FIG. 4A shows a state of removing a secondary scale of a billet conveyed in a posture in which a diagonal is horizontal and vertical, and shows a state in which a water-jet type scale is removed. FIG. 4B is a schematic front configuration explanatory view of a water-jet type scale removing apparatus showing a state of removing a secondary scale of a billet that is transported in a horizontal position with a flat portion. It is.

5 (a) is a schematic structural explanatory view of a water jet type scale removing device of a strip steel rolling facility according to a conventional example, and FIG.
FIG. 5B is a sectional view taken along line AA in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Steel rolling equipment 2 ... Heating furnace 3 ... Rough rolling mill row 4 ... Intermediate rolling mill row 5 ... Scale removing apparatus 6 ... Mechanical scale removing apparatus, 61 ... Horizontal pinch roll, 62 ... Vertical pinch roll 7 ... Water injection type Scale removing device, 71 ... header, 71a
... Split header, 72 ... Water injection nozzle, 73 ... Actuator, 74 ... Position detection sensor, 75 ... Header operating means W ... Billet

Claims (3)

[Claims] Claims: 1. An apparatus for removing scale from a surface of a steel bar before being rolled by each of the rolling mill rows, which is disposed on the entry side of the steel strip of each rolling mill row in the strip rolling equipment, A water jet nozzle for injecting high-pressure water toward the strip steel, and a water jet scale remover equipped with a header surrounding the steel strip, and at a position near the strip steel transport base side of the water jet scale remover. A scale removing device for a steel bar, comprising: a mechanical scale removing device disposed to apply a pressing force to a surface of the steel bar to remove a secondary scale. 2. A header of the water-jet type descaling device is constituted by a plurality of divided headers, and a divided header located outside a plane of the bar is supported so as to be able to approach and separate from the bar. The scale removing device for strip steel according to claim 1, wherein: 3. The header of the water jet type scale removing device is constituted by a plurality of divided headers, each of the divided headers is supported so as to be able to approach and separate from the steel bar, and a position of a corner portion of the steel bar. 2. A header detecting means for detecting a position of the strip bar, and a header operating means for operating a split header located outside the plane of the steel bar based on a detection signal from the position detecting sensor. Strip steel descaling equipment.