JP3331508B2 - Continuous hot rolling equipment for steel and flying crop shear used therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous hot rolling mill for steel products.
About the location, as well as flying crop shear used to it.

[0002]

2. Description of the Related Art Hot rolling of steel materials involves scratches and shape defects due to the absence of tension in so-called unsteady portions of the front and tail portions of the steel material, plate width defects due to threading speed, temperature defects and surface quality defects due to acceleration / deceleration. In recent years, a plurality of long steel materials for hot rolling have been sequentially joined in order to eliminate the deterioration of the order yield, the work of removing defective parts, and the work of passing through the slab, which are caused by the above-mentioned processes, and the rolling process is continuously performed at a predetermined speed. A so-called continuous hot rolling method has been attempted.

[0003] This continuous hot rolling method is a method of producing a long hot rolled steel material such as a hot-rolled steel material or a high-temperature thin-wall continuous cast slab (flat or coiled) supplied to a continuous hot rolling mill. In addition to cutting the tip and tail end by applying a flying crop shear in advance, the entire or part of the tail end cut surface and the end cut surface between steel materials is welded and joined to form a large number of long strips for hot rolling. A method is considered in which a steel material is hot-rolled successively with the same rolling schedule or a plurality of rolling schedules while continuously changing the relay, and after rolling, divided and cut by a plurality of winding machines alternately.

As the welding means, butt electric welding, pressure bonding, laser welding, and the like have been studied. Laser welding is advantageous from the viewpoints of quickness, bonding strength, and quality of the joint. For laser welding, it is required that the cut surface at the tail end and the cut surface at the front end between the steel materials be planarized in a parallel relationship such that the entire surface comes into contact at the time of abutting.

[0005] On the other hand, a flying crop shear, in which a steel material is applied in advance as a means capable of inexpensively cutting the tip and tail ends at a low speed, generally employs a tip cutting blade and a tail cutting blade which are rotated around the outer circumference of a pair of rotating drums. The cutting positions of the upper cutting blade and the down cutting blade of each cutting blade are arranged in the same relationship. For example, the upper cut blade is arranged so as to be positioned on the side opposite to the steel material of the down cut blade when cutting. The reverse is also true.

[0006]

As shown in FIG. 4A, the action of cutting and removing the tip C1 of the steel material S by the flying crop shear is based on the peripheral speed of the drums DM1 and DM2 based on the steel material S transfer speed. To cut and make
At the time of this cutting, the anti-crop side of the steel material S is pushed up by the antinode b of the upper cut blade UC1.
C1 and the roller table RT1 on the shear entry side, the crop side is cut on the crop discharge pit P1 and is not constrained by the roller table RT2 on the exit side, and is cut by the down-cut blade DC1, and constrained by the down-cut blade DC1. The cut surface F1 is a flat surface, and the unconstrained cut surface F2 is a curved surface of the lower chord.

Further, as shown in FIG. 4 (b), the action of cutting and removing the crop C2 at the tail end of the steel S is performed by making the peripheral speed of the drums DM1 and DM2 smaller than the steel S transfer speed. during cutting, since the anti-cropping side of the steel material becomes unrestrained cut-down cutting blades DC2, unrestrained cut surface F 3 by down-cut edge DC2 is not a complete plane, a state close to the lower chord of the curved surface . In the figure, P2 is a crop discharge pit on the entry side of the flying crop shear FCS.

In this manner, the crop C1,
Since the joining cut surface between the steel materials S from which C2 has been removed becomes the curved tail end cut surface F3 and the flat tip end cut surface F1, the curved tail end cut surface F3 is not suitable for the laser welding joining as it is. Secondary processing such as hot grinding was essential. However, when the continuous hot rolling speed is increased, this secondary treatment becomes temporally impossible. Further, in order to install the secondary processing equipment between the flying crop shear and the continuous hot rolling mill, it is subject to significant restrictions in relation to other ancillary equipment such as other one-stage and two-stage descaling equipment, so that it is not sufficient. No function can be obtained and, in some cases, installation is not possible.

[0009]

SUMMARY OF THE INVENTION The present invention provides an excellent means for solving the above problems, and has the following three features.

( 1 ) In a flying crop shear in which a tip cutting blade and a tail cutting blade of a long steel material for hot rolling are arranged at a predetermined rotation angle on the outer periphery of the same rotating drum, an upper cut of the tip cutting blade is provided. The blade is arranged in a relationship that is located on the side opposite to the steel material of the down-cut blade when cutting, and the upper cut blade of the tail end cutting blade is arranged in a relationship that is located on the side of the steel material of the down-cut blade when cutting. Flying crop shear for continuous hot rolling of steel.

( 2 ) On the entry side of the continuous hot rolling apparatus, along the traveling direction of the long steel material for hot rolling, the cutting edge of the steel material and the cutting edge of the tail edge of the steel material are co-rotated (equipmentally advantageous). ) Or arranged on the outer periphery of a separate rotating drum, and the upper cutting blade of the tip cutting blade is arranged so as to be positioned on the counter-progressive side of the steel material of the down cutting blade when cutting, and the upper cutting blade of the tail cutting blade is cut. Sometimes a flying crop shear arranged in a relationship that is located on the progress side of the steel material of the down cut blade,
A joining section having a laser welding joining apparatus and a pair of clamps that can move a traveling welding area of the laser welding joining apparatus and clamp each of the cutting tail end of the preceding steel and the cutting tip of the succeeding steel in abutting state. A continuous hot rolling apparatus for steel products, comprising a clamping device and a high-speed shear and a plurality of strip winding devices provided on the exit side of a continuous hot rolling mill.

( 3 ) A tip cutting blade and a tail end cutting blade of the steel material are arranged on the outer circumference of the same rotating drum or separate rotating drums along the traveling direction of the hot-extended steel material, and the tip cutting blade is provided. The upper cut blade of the tail cut blade is arranged in a relationship that is located on the side of the steel material of the down-cut blade when cutting, and the upper cut blade of the tail end cutting blade is arranged in a relationship that is located on the side of the steel material that is advanced in the cut when cutting. A pair of a flying crop shear, a laser welding joining device, and a pair of clamps each of which is capable of moving a traveling welding area of the laser welding joining device and abutting a cutting tail end of a preceding steel material and a cutting tip end of a following steel material. A joint clamping device having a clamp, a descaling device, a continuous hot rolling mill, a cooling device, a first pinch roll, a high-speed shear, a second pinch roll, and a third And hot run table which is interposed a Nchiroru, a plurality of strips retractor and continuous hot rolling apparatus of a steel material, characterized in that the was allowed sequential arrangement.

[0013]

As shown in the embodiment of FIG. 1A, the cutting crop C1 at the tip of the steel material S by the flying crop shear of the present invention is performed by changing the peripheral speed of the drums DM1 and DM2 to the steel material S transfer speed. In order to cut into larger pieces, the anti-crop side of the steel material is restrained cutting by the down-cut blade DC1 and the roller table RT, the crop side is unconstrained cutting, the constrained cutting surface F1 by the down-cut blade DC1 is flat, and the unconstrained cutting surface. F2 is the curved surface of the lower chord.
Further, as shown in FIG. 1 (b), action of cutting and removing the crop C2 of the tail end of the steel S, since the peripheral speed of the drum DM1, DM2 cutting to a small steel material S carrying speed, anti crop steel The side is restrained cutting by the down cut blade DC2 and the roller table RT, and the crop side is unrestricted cutting. Therefore restraining cut plane F 3 by down-cut blade DC2 becomes flat, unrestrained cutting surface F 4 becomes lower chord of curved surfaces.

In this manner, the front and tail crop C1,
The joining cut surface between the steel materials S from which C2 has been removed is a flat cut end surface F3 and a front end cut surface F1 having a parallel relationship with each other.
Since the butting of the surface contact with each other can be surely performed, it can be applied to the laser welding as it is, and no secondary processing such as grinding the cut surface is required at all, and it is continuous with the flying crop shear. It greatly eases the regulations on the installation of laser welding and joining equipment between hot rolling mills and auxiliary equipment such as descaling equipment.
In addition, a high-order stable operation of the continuous hot rolling is realized, and the rolling speed can be advantageously increased.

[0015]

Next, an embodiment of the present invention will be described with reference to FIGS. Flying crop shear FCS shown in Fig. 1
Is a down-cut blade DC on the outer periphery for cutting the tip of the steel material.
1 and the rotary drum DM1 arranged this with plane symmetry positioned steel tail cutting down cutting blades DC 2, the steel material uppercut blade UC 1 between this and plane symmetry position for truncation of the steel on the outer periphery constructed from the rotating drum DM2 Metropolitan placing the tail cutting uppercut blade UC 2, the down uppercut blade UC 1 for truncated during cutting cutting blade D
Place in a relationship which is located in the counter-traveling side of the steel material S of C1, is arranged in relation to the position in the traveling side of the steel material S down cutting blade DC2 during cutting uppercut blade UC 2 for the tail cut. The operation of this configuration is as described above.

FIGS. 2 and 3 show an overall configuration example of a continuous hot rolling apparatus in which the flying crop shear FCS is arranged. In the example of FIGS. 2 and 3, as shown in FIG. 2, the heating furnace 1 and the vertical scale breaker V move in the direction in which the steel material moves.
SB, first rough rolling mill R1, second rough rolling mill R2 (reversing mill), tandem third rough rolling mill R3 and fourth rough rolling mill R4, winding with heat retention box as shown in FIG. Machine 3 and rewinding machine 4, leveler 5, flying crop shear FCS having the above-described configuration, and running laser welding joining device 7 for welding a butt portion between the cutting tail end of preceding steel S1 and the cutting front end of succeeding steel S2. And a joint having a pair of clamps 6 and 8 which can move a traveling welding area of the laser welding joining apparatus 7 and clamp the cutting tail end of the preceding steel material S1 and the cutting tip end of the succeeding steel material S2 in an abutting state. Part clamping device CR, descaling device 9, 7-stand continuous hot finishing mill 10, cooling device 11 as shown in FIG.
A high-speed flying shear 13 for dividing the finished rolled strip into required single weights; a hot run table 16 provided with a second pinch roll 14 and a third pinch roll 15; This is a facility in which strip winding devices 17 and 18 are sequentially arranged.

Roller tables RT1 and RT2 are arranged before and after the flying crop shear FCS via cutting crop discharge pits P1 and P2. This equipment converts a slab 2 extracted from three heating furnaces 1 into a vertical scale breaker VSB and four rough rolling mills R1 to R4.
Steel sheet (long steel for hot rolling) S roughly rolled by
While keeping 1 warm, it is once wound into a coil shape by winder 3,
The coil Co is transferred to a rewinding machine 4, and as shown in FIG. 3, the coil Co is straightened by a rewinding leveler 5 while keeping the temperature, and the coil tip is adjusted to a flying crop shear F having the above-described configuration.
Supply to CS.

Next, the upper cut blade UC1 for cutting the tip of the flying crop shear FCS and the down cut blade DC
At 1, the tip of the coil is cut as shown in FIG. 1A and then supplied to a continuous hot rolling mill 10 of 7 stands via the clamping device CR and the descaling device 9 to be hot-finished and rolled. . Tail of uncoiler 4 wound while kept from the returned hot steel S1 is cut as shown in FIG. 1 (b) with a flying crop shear FCS of tail cutting uppercut blade UC 2 and the down cutting blade DC2 After that, it moves between the two clamps 6 and 8 of the clamp device CR. In parallel with this process, the rewinding machine 4 that has unwound the high-temperature steel sheet S1 coil Co is immediately Receiving the next rough pressed high temperature steel sheet S2 coil Co
It is rewound and its tip is cut by the upper cut blade UC1 for cutting the tip of the flying crop shear FCS via the leveler 5 in the same manner as the preceding high-temperature steel sheet S1 to cut between the clamps 6 and 8 of the clamp device CR. And clamps the cut surface against the cut end surface of the preceding moving hot steel plate S1. This is the clamping device C
R moves by the transfer force of the steel plate.

As shown in FIG. 3, a laser beam welding and joining apparatus 7 for welding a butt portion between the clamps 6 and 8 includes a laser beam fixed light source 7a, a steel plate moving direction movable mirror 7b, and a steel plate thickness direction movable mirror 7c. The main configuration is a steel plate width direction movable condensing mirror 7d and a CCD camera 7e, and a laser beam is irradiated along the butted portion and welded while moving in synchronization with the moving speed of the butted portion to form the hot steel plates S1 and S2. Complete joining. After this, the clamping device CR
Releases the steel plate and returns to the original standby position to drive. The high-temperature steel sheets S3... Sn are joined while sequentially repeating the above operations, and are continuously supplied to the continuous hot finish rolling mill 10 to perform hot finish rolling to a predetermined size. In addition, as a modified example of this example, as another arrangement position of the flying crop shear FCS, it may be installed on the upstream side of the winder 3.

[0020]

According to the above-mentioned equipment, the width is 1000 mm × 34 mm × 6
30 coils of a high-temperature steel sheet coil having a length of 0 m were joined and continuously hot-finished and rolled to a total coil width of 1000 mm × 2 mm thick. After rolling, the coil was divided and wound into a single 16-ton coil. Also, with this equipment, width 1000mm × 34mm thickness × 6
20m high-temperature steel coil of 0m length and width of 1050mm
20 high-temperature steel coils of 34 mm thickness x 57 m length are joined together, and they can be continuously hot-finished and rolled into two types of 1000 mm x 1.8 mm thick and 1050 mm x 2 mm thick. After rolling, the unit weight is 16 tons. The coil could be wound separately.

In each of the above rolling examples, all the coils were free from damage such as breakage at the joints, and could be subjected to stable continuous hot finish rolling. The rate of occurrence of abrasions, shape defects, thickness width defects, temperature defects, and surface quality defects is about 0.3%, which is a large improvement over the conventional hot finish rolling rate of 1.4% for each hot steel sheet. As a result, the order yield of the products was greatly improved, and the work of removing defective parts and the work of adjusting the finishing plate were almost completely eliminated.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory diagrams showing an embodiment of a flying crop shear of the present invention.

FIG. 2 is a simplified bird's-eye view showing an embodiment of the device of the present invention .

FIG. 3 is an explanatory diagram illustrating a main configuration of the device illustrated in FIG. 2;

FIGS. 4A and 4B are explanatory views showing a conventional flying crop shear. FIG.

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21B 15/00 B21B 1/26

Claims (3)

(57) [Claims] 1. A flying crop shear in which a tip cutting blade and a tail cutting blade of a long steel material for hot rolling are arranged at a predetermined rotation angle on the outer periphery of the same rotating drum, and the upper cutting blade of the tip cutting blade is provided. It is arranged that the upper cut blade of the tail end cutting blade is disposed in the relation of being located on the progress side of the steel material of the down cut blade at the time of cutting. Features A flying crop shear for continuous hot rolling of steel. 2. On the entry side of a continuous hot rolling device, a cutting blade at the leading end and a cutting blade at the tail end of the steel material are arranged in the same rotating drum along the traveling direction of the long steel material for hot rolling. Or it is arranged on the outer periphery of a separate rotating drum, and the upper cut blade of the tip cutting blade is arranged in a relationship to be positioned on the counter-progression side of the steel material of the down cut blade when cutting, and the upper cut blade of the tail end cutting blade is cut when cutting. Flying crop shear placed in relation to the steel material traveling side of the down-cut blade, laser welding and joining equipment, and the traveling tail area of the laser welding and joining equipment can be moved so that the cutting tail end of the preceding steel and the succeeding steel A joining portion clamping device having a pair of clamps for clamping each in abutting state with the cutting tip of the cutting device is provided, and a high-speed shear and a plurality of strip winding devices are provided on the output side of the continuous hot rolling mill. A continuous hot rolling apparatus for steel materials, comprising: 3. A tip cutting blade and a tail cutting blade of the steel material are arranged on the outer circumference of the same rotating drum or separate rotating drums along the traveling direction of the long steel material for hot rolling, and The upper cut blade was arranged in a relationship located on the counter-progression side of the steel material of the down-cut blade at the time of cutting, and the upper cut blade of the tail end cutting blade was arranged in a relationship positioned on the progress side of the steel material of the down-cut blade during cutting. Flying Crop Shear, Laser Welding and Joining Equipment, A pair of laser welding and joining equipment that can move between the running areas and clamp the cutting end of the preceding steel material and the cutting end of the succeeding steel in abutting condition. Clamp device having a clamp, a descaling device, a continuous hot rolling mill, a cooling device, a first pinch roll, a high-speed shear, a second pinch roll, and a third pin A continuous hot rolling apparatus for a steel material, wherein a hot run table provided with a chillol and a plurality of strip winding apparatuses are sequentially arranged.