JP2000052061A - Method and device for hot pressure welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably carry out hot pressure welding of a rolled steel material by holding the steel material while bend deformation is applied to the steel material in a range where a hardware of a holding device is abutted when the rolled steel material is installed between upper and lower pressure welding dies. SOLUTION: A rolled material with a bent edge is bent at the position of a holding device 11, and abutted to an upper die 16-1 and a lower die 16 of a rolling press 10 for correction. In the holding device 11 on the preceding steel material side, the width B1 of a lower hardware 22-1 is larger than the width B of an upper hardware 21-1, and a bottom face 23 of the upper hardware is provided at the position lower than that of a bottom face 23-1 of the upper die 16-1 by h. In the holding device 11-1 of the following steel material, the width B1 of the upper hardware 21-2 is larger than the width B of the lower hardware 22-2, and a top face 24 of the lower hardware is provided at the position lower than that of the top face 24-1 of a pressure welding press lower die 16 by h. When the rolled steel material is held by the hardware, the steel material is bent at the position of the small width hardware as shown in dotted line, but is corrected as shown in solid line by being restrained with the pressure welding press die.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-welding method and a hot-welding apparatus for performing continuous hot-rolling in which rough-rolled steel is joined and then finish-rolled, and particularly to an end portion of a rolled steel. The present invention relates to the above method and apparatus characterized by a grip for performing cutting and joining for descaling.

[0002]

2. Description of the Related Art In steel manufacturing plants, continuous production processes are being vigorously promoted for the purpose of energy saving, improvement of product yield, improvement of productivity, and the like. Among them, continuation of the hot rolling process for producing a hot-rolled steel sheet (hot coil) is one of the important issues.

[0003] In recent years, between a rough rolling mill and a finishing rolling mill, a preceding rough-rolled steel material (hereinafter, referred to as a preceding steel material) and a subsequent rough-rolled steel material (hereinafter, referred to as a succeeding steel material) are joined. A method of continuously performing hot finish rolling has been proposed.

[0004] For example, a method in which a superposed portion of a hot-rolled steel sheet is heated in a reducing flame atmosphere to reduce the scale and press the entire width of the hot-rolled steel sheet in the thickness direction (see Japanese Patent Application Laid-Open No. 6-312277). ). Also, steel plates with thick scales,
Alternatively, in the case of a steel sheet in which a scale having a composition that is not easily reduced is formed, a method of mechanically descaling with a rotary cutting tool or the like and pressing the same (Japanese Patent Laid-Open No. 6-335785,
8-19804, 9-57302, and the like).

FIG. 1 is a diagram showing an outline of a continuous hot rolling facility in which a hot press apparatus is arranged.

[0006] The slab 9 of the slab is rolled by the rough rolling mill 1 into a rolled steel material S, which is once wound into a coil in the intermediate coiler 2. Then, it is rewound before being sent to the finishing mill group 6, the winding habit of the coil is corrected by the leveler 3, and the defective portion at the end is cut by the crop shear 4. Then, after pressing the rear end of the preceding steel S1 and the front end of the following steel S2 in the hot pressing device 5 that runs, finish rolling is performed by the finishing rolling mill group 6, and the roll is wound up by the down coiler 8. . Then, it is cut by the high-speed shear 7 to form a hot-rolled steel sheet coil.

FIG. 2 is a longitudinal sectional view showing a hot pressing apparatus using a rotary cutting tool.

[0008] Hot bonding is performed in the following steps. First, the rear end of the preceding steel S1 is positioned at
10), fix the steel material with the gripping device 11
The table roller 13 provided in 12 is moved up and down by the cylinder 14
And push it up to a position where it can be cut by the cylindrical rotary cutting tool 15. Next, when the trailing steel material S2 is advanced and its tip comes to the position of the lower mold 16 (position overlapping the rear end of the preceding steel material), the trailing steel material is fixed by the gripping device 11. Thereafter, the burner 17 is burned to move the cylindrical rotary cutting tool 15 in the direction indicated by the arrow as a reducing flame atmosphere around the ends of the leading steel S1 and the trailing steel S2 to cut the ends of the respective steels. . When the cutting is completed, the rotary cutting tool is retracted, and the gantry 12 of the preceding steel material is lowered simultaneously with the press-contact press 10 to press-contact. The hot pressing device 5 travels in the rolling direction by traveling rollers 18.

[0009] There are two methods for hot joining, namely, a method of superimposing them according to the shape of the joint of steel plates and a method of performing butt joining.

FIG. 3 is a view showing an embodiment of the joining, and FIG.
(C) is a diagram in which steel plates are overlapped and pressed in the thickness direction to join them, and (d) is a diagram in which steel plates are butted and pressed in the longitudinal direction to join them.

As shown in FIG. 3 (a), the joining method is performed by cutting the joining portion obliquely, as shown in FIG. 3 (b), by cutting stepwise as shown in FIG. 3 (b), or as shown in FIG. 3 (c). With a groove-shaped notch. In each case, the steel sheet S1, S
2 Hold the cutting surfaces 19 and 20
The pressure is reduced in the thickness direction of the steel. Simultaneously with the reduction, one of the gripping devices (in this case, the preceding steel gripping device 11) is moved according to the amount of reduction, or the gripping device is opened.
At the time of cutting and joining, a reducing flame is blown from the burner 17 to prevent oxidation.

As shown in FIG. 3 (d), after cutting or cutting, the steel materials S1 and S2 are gripped by the gripping device 11, and the cut portions or cut surfaces 19 and 20 are butted on the same plane. The holding device is pressed and moved in the longitudinal direction of the steel plates to join them. During cutting and joining, a reducing flame is blown from the burner 17 to prevent oxidation.

[0013]

As described above, when the joining strength of the joints obtained by these hot joining methods is low, not only does it break during rolling, making continuous rolling impossible. Equipment may be damaged.

An object of the present invention is to provide a method and apparatus for stably performing hot pressing of rolled steel in order to stably perform continuous hot rolling.

[0015]

Means for Solving the Problems The inventors of the present invention have insufficient hot joining when the rolled steel material is not in good contact with the die of the pressure welding press. It was found that the rolled steel material was bent at the end by shear cutting, and to correct this, it was sufficient to bend it with the gripping part,
The present invention has been completed.

The gist of the present invention resides in a hot-welding method characterized in the following gripping of a rolled steel material and a hot-welding equipment shown in FIGS. 5 to 8.

In the continuous hot rolling by joining the ends of two rolled steel materials, a method of descaling a high-temperature rolled steel material and superimposing and pressing the rolled steel materials, wherein the rolled steel materials are vertically welded. A hot pressure welding method in which a rolled steel material in a range where the metal fitting of the gripping device is in contact with the steel plate is subjected to bending deformation and gripped when installed between the tooling dies.

A hot pressing apparatus comprising a gripping device for gripping the ends of two rolled steel materials, a rotary cutting device for descaling, and a pressing device for pressing, wherein the gripping device grips a succeeding steel material. The height of the upper surface of the lower metal fitting is set higher than the height of the upper surface of the lower mold of the pressure welding press,
A hot pressing apparatus in a continuous hot rolling facility in which a height of a gripping device for gripping a preceding steel material to a lower surface of an upper metal fitting is lower than a height of a pressing press to a lower surface of an upper mold.

The above-described gripping device is a device in which the width (the length in the rolling direction) of the upper fitting 21-1 is different from the width of the lower fitting 22-1 (see FIG. 5). An apparatus provided with a metal fitting having a projection or a depression formed in the width direction of the surface (see FIG. 6);
Alternatively, it is desirable to use a device in which opposing portions of the upper and lower metal fittings are rolls and the vertical surfaces including the respective roll shafts are separated from each other (see FIG. 7 or FIG. 8).

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a rough rolled slab is cut by a shear before joining. This cut portion is drooped or deformed, and when cutting for descaling is performed, a phenomenon occurs in which a margin between a preceding steel material and a following steel material is different.

FIG. 4 is a schematic view showing a state in which a rolled steel material having a bent end is cut by a rotary cutting tool. Rolled steel S
The ends of S1 and S2 are slightly corrected along the upper die 16-1 and the lower die 16 of the press-contact press 10 by the cutting force of the rotary cutting tool 15, but the cut surface 19 and the cut surface 20 Its length is different.

According to the present invention, a rolled steel material having a bent end is bent at the position of the gripping device and is brought into contact with the upper die 16-1 and the lower die 16 of the press-contact press 10 for straightening.

FIG. 5 is a schematic view for explaining a situation in which a rolled steel material is straightened when a gripping device having a difference between the width of the upper fitting (length in the rolling direction) and the width of the lower fitting is used. It is.

In the gripping device 11 on the preceding steel material side, the width B1 of the lower metal fitting 22-1 is larger than the width B of the upper metal fitting 21-1, and the lower surface 23 of the upper metal fitting is the lower surface of the press-contact upper die 16-1. H than 23-1 position
Only at a lower position. The gripping device on the trailing steel side
In 11-1, the width B1 of the upper metal fitting 21-2 is larger than the width B of the lower metal fitting 22-2, and the upper surface 24 of the lower metal fitting is the upper surface of the press-contact lower die 16.
It is provided at a position higher by h than the position 24-1.

When the rolled steel material is gripped by the metal fitting having the above-described shape, the rolled steel material is bent at the position of the metal fitting having a small width as shown by a broken line in FIG. However, it is corrected as shown by the solid line because it is constrained by the die of the press press.

FIG. 6 is a schematic diagram for explaining a situation in which a rolled steel material is straightened when using a gripping device in which the opposing surfaces of the upper metal fitting and the lower metal fitting have a concave shape and a convex shape. Also in this case, since the rolled steel material is bent at the gripping portion, it is restrained by the pressing press die and straightened.

FIG. 7 is a schematic diagram for explaining a situation in which a rolled steel material is straightened when using a gripping device provided with pinch rolls on the upper and lower metal fittings. The gripping device on the preceding steel material side is provided such that the vertical surface including the roll axis of the lower metal fitting is separated from the upper metal fitting by d on the press-contacting press side. Further, the gripping device on the subsequent steel material side is provided such that the vertical surface including the roll axis of the upper metal fitting is separated from the lower metal fitting by d on the press-contacting press side. Also in this case, the rolled steel
Since it is bent at the grip portion, it is restrained by the press-contact press die and straightened.

FIG. 8 is a schematic diagram for explaining a situation in which a rolled steel material is straightened when using a gripping device provided with pinch rolls on an upper metal fitting and a lower metal fitting. In the gripping device on the preceding steel material side, two pinch rolls are provided in parallel on a lower metal fitting. Also, the gripping device on the following steel material side is
One pinch roll is provided in parallel. Also in this case, since the rolled steel material is bent at the gripping portion, it is restrained by the pressing press die and straightened.

FIG. 9 is a conceptual diagram of an apparatus for detecting the position of a rolled steel material and controlling its movement. The position detector 25 inputs to the drive control device that the rear end of the preceding steel material has reached the optimal position of the upper die 16-1 of the press-contact press 10. The drive control device drives the hydraulic unit according to the input, and
At 11 the preceding steel material is gripped. In addition, the position detector 25-1, when the leading end of the following steel material comes to the optimal position of the lower die 16 of the press-contact press 10, drives the hydraulic unit and grips the following steel material with the gripping device 11-1. . The camera 26 confirms that the rolled steel material is disposed between the upper and lower molds, and outputs a command for cutting and pressing for descaling from the drive control device.

[0030]

[Example] Steel plate with a thickness of 30 mm, a width of 300 mm and a length of 1000 mm (C: 0.4% by weight, Si: 0.015% by weight, Mn: 0.26% by weight)
Was prepared, and a continuous rolling test was performed using a small-sized rolling facility shown in FIG. 1 in which the hot-welding apparatus shown in FIG. 2 was arranged.

For descaling, the maximum outer diameter of the cutting edge is 300 m
A cylindrical rotary tool having a length of 320 mm and a length of 320 mm was used. The cutting conditions were a rotation speed of 1500 rpm, a moving speed of 6000 mm / min, a temperature of the steel plate of 1050 ° C., a cutting width of the steel plate tip of 30 mm, a start of the reduction flame igniting 1 second, and a cutting in an open flame reducing flame atmosphere. .

The atmosphere of the direct flame was used to form a reducing flame by injecting a mixed gas from a ring-shaped slit nozzle using a burner of a mixing method in the nozzle. A plurality of burners were arranged in the plate width direction. As the fuel, LPG gas of 6 Nm ³ / hr per burner was used at an oxygen enrichment rate of 60% and an air ratio (m) of 0.6.

(Example 1) A gripping device shown in Fig. 5 was arranged in the above-mentioned hot pressure welding device. The lower bracket of the preceding steel material has a width of B1.
130mm, length 320mm, upper bracket width B 100mm, length 320m
m. The upper metal fitting on the following steel material side had a width B1 of 130 mm and a length of 320 mm, and the lower metal fitting had a width B of 100 mm and a length of 320 mm.
Further, h indicating the height positional relationship of the brackets is 30 mm in each case.
And

After the descaling (cutting) was performed under the above conditions, pressing was started one second after the rotary cutting tool was retracted. Welding is 25 mm in overlap allowance, and capacity is 300 for welding.
Using a ton press, pressing was performed until the plate thickness became 30 mm. The injection of the reducing flame was continued until the pressure welding was completed, and after the pressure welding was completed, the injection was switched to the oxidizing flame.

After performing the above pressure welding, the temperature of the steel
When the temperature reaches ℃ 40, each of the three finishing mills
%, 35%, and 30% reduction and a tension of about 5.0 kgf / mm ² were rolled to produce a 8.2 mm thick coil. Even if the rolling tension in the finishing mill was 5 kgf / mm ² , the rolled material could be rolled normally without breaking.

(Example 2) A gripping device shown in FIG. 6 was arranged in the above-mentioned hot pressure welding device. The lower metal fitting of the preceding steel material is concave, the width B of the support part is 100 mm, the angle of the inclined part is 5 °, the length is 320 mm, the upper metal part is convex, the width B is 100 mm, and the inclined part at the tip is The angle was 5 ° and the length was 320 mm. In addition, the upper metal fitting on the following steel material side is concave, the width B of the support part is 100 mm, the angle of the inclined part is 5 °, the length is 320 mm, the lower metal part is convex, the width B is 100 mm, The angle of the slope is 5 ° and the length is
320 mm. Further, h indicating the height positional relationship of the bracket.
Were all 30 mm.

As a result of performing pressure welding and continuous rolling in the same manner as in Example 1, the rolled material was successfully rolled without breaking.

(Example 3) A gripping device using the metal fitting shown in FIG. 7 as a pinch roll was arranged in the above-mentioned hot pressure welding device. The pinch roll of the lower bracket of the preceding steel material has a diameter of 100 mm,
The vertical plane including the axis was shifted by 10 mm from the upper fitting to the press-contact press side. Further, h indicating the height positional relationship of the metal fittings was set to 30 mm.

As a result of pressing and continuous rolling in the same manner as in Example 1, the rolled material could be rolled normally without breaking.

[0040]

According to the gripping method of the present invention, even a rolled steel material having a bending deformation at the end due to shear cutting or the like is set and corrected during the press-contact press, so that it can be used for descaling. Cutting and pressure welding are performed stably. Thereby, continuous hot rolling can be performed stably.

[Brief description of the drawings]

FIG. 1 is a view showing an outline of a hot continuous rolling facility in which a hot pressing device is arranged.

FIG. 2 is a longitudinal sectional view showing a hot pressure welding device using a rotary tool.

FIGS. 3A to 3C are views showing a mode of joining, in which FIGS. 3A to 3C are views in which steel sheets are overlapped and pressed in the thickness direction thereof, and FIG.
FIG. 3 is a diagram in which steel plates are joined together by pressing in the longitudinal direction thereof.

FIG. 4 is a schematic diagram showing a state in which a rolled steel material having a bent end is cut by a rotary cutting tool.

FIG. 5 is a schematic diagram for explaining a situation in which a rolled steel material is straightened when a gripping device having a difference between the width of the upper fitting (the length in the rolling direction) and the width of the lower fitting is used.

FIG. 6 is a schematic diagram for explaining a situation in which a rolled steel material is straightened when using a gripping device in which a facing surface of an upper metal fitting and a lower metal fitting has a concave shape and a convex shape.

FIG. 7 is a schematic diagram for explaining a situation in which a rolled steel material is straightened when a gripping device provided with pinch rolls on an upper metal fitting and a lower metal fitting is used.

FIG. 8 is a schematic diagram for explaining a situation in which a rolled steel material is straightened when a gripping device provided with pinch rolls on an upper metal fitting and a lower metal fitting is used.

FIG. 9 is a conceptual diagram of a device that detects the position of a rolled steel material and controls its movement.

[Explanation of symbols]

 1. Rough rolling mill 2. Intermediate coiler 3. Leveler 4. Crop shear 5. Hot pressure welding device 6. Finish rolling mill 7. High speed shear 8. Down coiler 9. Slab 10． Pressing press 11． Gripping device 12. Mount 13. Table roller 14. Lifting cylinder 15． Cylindrical rotary cutting tool 16. Lower mold 16-1. Upper mold 17． Burner 18. Running rollers 19,20. Joint 21. Upper bracket 22. Lower bracket 23. Lower surface of upper bracket 24. Top surface of lower bracket 25. Position detector 26. camera

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Norio Iwanami No. 1 Shinnakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawa Shima-Harima Heavy Industries, Ltd. Yokohama Engineering Center (72) Inventor Nobuhiro Tasoe 1-chome Mori, Koto-ku, Tokyo No. 19, No. 10, Ishikawajima Harima Heavy Industries, Ltd. Koto Office (72) Inventor Shiro Nagata No. 1, Shinnakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture CA14 4E067 AA02 BB02 BC01 BD02 DA01 DA04

Claims (5)

[Claims] 1. A method in which ends of two rolled steel materials are joined to perform continuous hot rolling, and after hot rolling steel materials are descaled, they are overlapped and pressed to each other, and the rolled steel materials are vertically moved. A hot-welding method characterized in that when installed between the press-welding dies, the rolled steel material in a range where the metal fitting of the gripping device is in contact is bent and gripped. 2. A hot pressing apparatus comprising a gripping device for gripping the ends of two rolled steel materials, a rotary cutting device for descaling, and a pressing device for pressing, wherein the subsequent steel material is gripped. The height of the lower bracket upper surface of the gripping device is provided at a position higher than the height of the lower die upper surface of the pressure welding press,
And a height of the gripping device for gripping the preceding steel material to the lower surface of the upper metal fitting is provided at a position lower than the height of the pressing die to the lower surface of the upper die. . 3. The continuous heat as claimed in claim 2, wherein the gripping device is a device having a difference between the width of the upper bracket (the length in the rolling direction) and the width of the lower bracket. Hot welding equipment in hot rolling equipment. 4. The continuous hot rolling equipment according to claim 2, wherein the gripping device includes a metal fitting having a convex portion or a concave portion formed in a width direction of opposing surfaces of the upper and lower metal fittings. Hot pressure welding equipment. 5. The gripping device according to claim 2, wherein the opposing portions of the upper and lower metal fittings are rolls, and vertical surfaces including respective roll shafts are separated from each other.
4. A hot pressing apparatus in a continuous hot rolling facility according to item 1.