JP3408973B2 - Tool moving method at descaling in continuous hot rolling and tool moving device 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 method of moving a cutting tool for descaling a rolled steel material (for example, a red hot steel material having a temperature of 900 ° C. or higher) efficiently and reliably in a continuous hot rolling line for steel materials. And a moving device for a cutting tool using the same.

[0002]

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

In recent years, 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 following steel material) are joined between a rough rolling mill and a finish rolling mill. However, a method of continuously performing finish rolling (this is simply referred to as "continuous hot rolling") has been proposed.

For example, a method of heating the superposed portion of the hot-rolled steel sheet in a reducing flame atmosphere to reduce the scale and press-contact the entire width of the hot-rolled steel sheet in the thickness direction (see JP-A-6-312277). ), And a steel plate on which a thick scale is produced,
Alternatively, in the case of a steel sheet in which a scale with a composition that is difficult to reduce is generated, a method of mechanically descaling with a rotary cutting tool and the like and pressure welding (JP-A-6-335785,
8-19804 and 9-57302), etc.

FIG. 1 is a diagram showing an outline of a hot continuous rolling facility in which a hot pressure welding device is arranged. The slab 9 of the slab is rolled by the rough rolling mill 1 into a rolled steel material S, which is once wound around a coil in the intermediate coiler 2. Then, it is rewound before being sent to the finishing rolling mill group 6, the winding tendency 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 trailing end of the preceding steel material S1 and the leading end of the following steel material S2 in the running hot pressure welding device 5, finish rolling is performed by the finishing rolling mill group 6 and is wound on 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 vertical cross-sectional view showing a hot pressure welding device using a rotary cutting tool.

The joining is carried out in the following steps. First, when the rear end portion of the preceding steel material S1 reaches a predetermined position (position of the pressure welding press 10), the steel material is fixed by the clamp device 11, and the pedestal 12
The table roller 13 provided on the table is raised by the lifting cylinder 14 and pushed up to a position where it can be cut by the cylindrical rotary cutting tool 15. Next, when the trailing steel material S2 is moved forward and its tip reaches the position of the lower die 16 (position overlapping the trailing end of the preceding steel material), the trailing steel material is fixed by the clamp device 11. After that, 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 preceding steel material S1 and the following steel material S2, and the ends of the respective steel materials are cut. . When the cutting is completed, the rotary tool is retracted, and the pedestal 12 of the preceding steel material is lowered at the same time as the pressure welding press 10 and pressure-welded. The hot pressing apparatus 5 travels in the rolling direction by the travel roller 18.

There are two methods of hot joining, one is by superimposing and the other is by butting, depending on the shape of the joint of steel plates.

FIG. 3 is a view showing a mode of joining, (a)
FIG. 3B is a diagram showing a case where the joint is cut obliquely, and FIG. 7B is a diagram showing a case where the joint is cut in a stepwise manner. In each case, the steel plates S1 and S2 are gripped by the gripping device 19, the cutting surfaces 20 and 21 are overlapped with each other, and the pressure welding press 10 reduces the thickness of the steel material. At the same time as the reduction
Either gripping device (in this case, the trailing steel plate gripping device 1
9) Move according to the reduction amount or open the gripping device. When cutting and joining, burner 17
Spray a reducing flame from to prevent oxidation.

FIG. 4 is a view showing a rotary cutting tool for cutting while moving the rotary cutting tool in the width direction of the rolled steel material,
(a) is a figure which shows a conical rotary cutting tool, (b) and (c) is a cylindrical rotary cutting tool. The rotary cutting tools shown in Figs. 4 (a) and 4 (b) move in the width direction of the steel product by inclining its axis with respect to the rolling direction of the steel product during cutting, but the rotation shown in Fig. 4 (c). The cutting tool moves in the width direction of the steel product with its axis parallel to the rolling direction of the steel product. A cutting method using such a rotary cutting tool is proposed in, for example, Japanese Patent Application Laid-Open No. 8-10809.

[0011]

In the cutting method proposed in Japanese Patent Laid-Open No. 8-10809, the rotary cutting tool moves only in the width direction of the rolled steel material.

FIG. 7 is a conceptual diagram for explaining an example of a conventional moving method of a cutting tool, (a) is a view showing the movement of the tool during cutting, and (b) is a tool waiting after cutting. FIG. 6C is a diagram showing the position, and FIG. 7C is a diagram showing movement of the cutting tool at the time of joining with the next rolled steel material.

For cutting, as shown in FIG. 7 (a), the rotary cutting tool 15 is moved from the standby position P1 between the lower surface of the trailing end portion of the preceding steel material S1 and the upper surface of the leading end portion of the following steel material S2 by a solid arrow. Insert as shown, move to position P2, and cut the ends of the two rolled steel products diagonally or parallel to the plate surface. After cutting,
As shown in FIG. 7 (b), the preceding steel material and the following steel material are superposed (S1, S2) and continuously rolled. At this time, the rotary cutting tool 15 stays at the position P2 until cutting for joining the next rolled steel material S22 is started. Then, as shown in FIG. 7 (c), the cutting of the next rolled steel material S22 and rolled steel material (S1, S2),
This is done by moving (retracting) the rotary cutting tool from position P2 to position P1.

As described above, since the rotary cutting tool performs cutting in each step of reciprocating in the width direction of the rolled steel material, the cutting blade repeats the state of upward cutting and the state of downward cutting, which shortens the tool life.

An object of the present invention is to provide a moving method and a moving device of a cutting tool capable of solving the above problems when performing cutting in a reducing atmosphere for descaling the surfaces to be joined of a high temperature steel material. Especially.

[0016]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a cutting tool moving method shown in the following and for cutting descaling by cutting in performing continuous hot rolling. is there.

After descaling the ends of the two rolled steel products, when joining and performing continuous hot rolling, the hot rolled steel products are cut with a rotary cutting tool in a reducing flame atmosphere to descale the rolled steel products. In the method, a rotary cutting tool is moved in the width direction of the rolled steel material to cut the ends of the two rolled steel materials, and then the tool is moved diagonally upward with respect to the rolling direction, and further in the width direction of the rolled steel material. And a method for moving a cutting tool at the time of descaling in continuous hot rolling, which is characterized by moving it obliquely downward with respect to the rolling direction and returning it to the initial position.

After descaling the ends of the two rolled steel products, when joining and performing continuous hot rolling, the hot rolled steel products are cut with a rotary cutting tool in a reducing flame atmosphere to descale the rolled steel products. In the method, the two rotary cutting tools are respectively moved from the end in the width direction of the rolled steel material to the central portion, the ends of the two rolled steel materials are cut, and then the respective tools are cut in the central portion with respect to the rolling direction. Of the cutting tool during continuous descaling in continuous hot rolling, characterized by moving it diagonally upward and then diagonally downward with respect to the width and rolling directions of rolled steel and returning it to the initial position. Method.

A slide table 26 to which a bearing box 25 for supporting the rotary cutting tool 15 and a driving device 27 for rotating the rotary cutting tool is fixed, and the slide table 26 can be moved diagonally to the rolling direction. The cutting device C, which is composed of a tool holder 28 having a moving device 29 for moving the sliding table 26, is supported by the guide rod 30 fixed to the underframe 31 penetrating therethrough, and also the table. A tool moving device connected to a lateral moving device 32 fixed to a frame 31.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The movement of a cutting tool of the present invention is a method of moving a cylindrical or conical rotary cutting tool in the width direction and the vertical direction of a rolled steel material.

5A and 5B are conceptual views for explaining an example of the moving method of the cutting tool according to the present invention. FIG. 5A is a view showing the movement of the tool during cutting, and FIG. 5B is the tool retreat after cutting. It is a figure showing movement of time.

The cutting is performed by a rotary cutting tool as shown in FIG. 5 (a).
15 is inserted from the standby position P1 between the lower surface of the trailing end of the preceding steel material S1 and the upper surface of the leading end of the following steel material S2 as shown by the solid arrow, and moves to the position of P2 to move the ends of the two rolled steel materials. Cut the part diagonally or parallel to the plate surface. After cutting,
As shown in FIG. 5 (b), the preceding steel material and the following steel material are superposed (S1, S2) and continuously rolled. The rotary cutting tool is P
It is pulled up to the position of 3, moved to P4 as shown by the dashed arrow, and returned to P1.

6A and 6B are views showing an example of the cutting tool moving device of the present invention. FIG. 6A is a partial cross-sectional view seen from the side of the rolling line, and FIG. 6B is a view seen from the front of the rolling line. FIG.

The rotary cutting tool 15 has its arbor 22 fixed to a bearing box 25 and is fixed to a slide table 26 together with a drive unit 27. The slide table 26 is installed on the tool holder 28, and has a structure that can be moved diagonally by a moving device 29.

The tool holder 28 is composed of two side plates 28-1, a triangular bottom portion 28-2 and a cylindrical distance piece 28-3, and the slide table is provided on the slope of the bottom portion 28-2. 26 is installed so that it can slide, and two side plates 28-1 have guide rods.
Two holes for penetrating 30 are opened, supported by two guide rods 30, and moved by a moving device 32 in the width direction of the rolled steel material. The two guide rods 30 are fixed to the underframe 31.

The moving device 29 is fixed to the inclined surface of the bottom portion 28-2 of the tool holder 28, and is connected to the slide table 26 to which the rotary cutting tool 15 is fixed. As a result, the rotary cutting tool 15 can be moved diagonally with respect to the rolling line, so that the cutting amount can be adjusted (from position P4 to position P1 shown in FIG. 5 (b)).
And the tool can be retracted after cutting (pulling up from position P2 to position P3 shown in FIG. 5 (b)).

The moving device 32 is fixed to the underframe 31 and is connected to one side plate 28-1 of the tool holder 28 that holds the rotary cutting tool. As a result, the rotary cutting tool 15 moves in the width direction of the rolled steel material and performs cutting (position P1 to position P2 shown in FIG. 5 (a)).
(Moving to position P3) and retreating the tool after cutting (moving from position P3 to position P4 shown in FIG. 5 (b)).

FIG. 8 is a conceptual diagram for explaining an example of the moving method of the cutting tool according to the present invention.

Two rotary cutting tools 15, 15-1 are used for cutting.

In the rotary cutting tool 15, the tool is moved from the standby position P1 to the position P2 to obliquely or parallelly cut the lower surface of the end of the preceding steel material S1. In the rotary cutting tool 15-1, the tool is After moving from the standby position P1-1 to the position P2-1, the upper surface of the end portion of the trailing steel material S2 is cut obliquely or in parallel.

After cutting, the rotary cutting tool 15 is lifted up from the position P2 to the position P3, then passes through P4 and is returned to P1. Also, the rotary cutting tool 15-1 moves from position P2-1 to position P3.
After being pulled down to -1, it passes P4-1 and is returned to P1-1.

In this cutting method, since the preceding steel material and the following steel material are cut by different cutting blades using two rotary cutting tools, the cutting speed can be increased.

FIG. 9 is a conceptual diagram for explaining another example of the moving method of the cutting tool according to the present invention. Also in this case, two rotary cutting tools 15 and 15-1 are used.

The rotary cutting tool 15 moves from the standby position P1 to the position P2.
The lower surface of the leading steel S1 and the trailing steel S2.
Diagonally or parallelly cut the upper surface of the end of. At the same time, the rotary cutting tool 15-1 is moved from the standby position P6 to the position P7 for cutting, and further moved to P2 for cutting. When the rotary cutting tool 15-1 moves from P7 to P2, the rotary cutting tool 15 retracts from P2 to P3. Each tool is
After being lifted from P2 or P3 to P8 or P4, it is returned to the original position P1 or P6 via P9 or P5.

Since two rotary cutting tools can be used, the time required for descaling can be shortened and the rolling speed can be increased.

[0036]

Since the rotary cutting tool moving device of the present invention has a structure in which the tool can be moved obliquely upward with respect to the rolling direction of the rolled steel material, it can be returned to the original position immediately after cutting is completed. If the method of moving the cutting tool using this device is adopted, the cutting state becomes continuous to upward cutting or downward cutting, and the tool life can be extended. Also, 2
When two rotary cutting tools are used, the time required for descaling is shortened and the rolling speed can be increased.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a hot continuous rolling facility in which a hot pressure welding device is arranged.

FIG. 2 is a vertical cross-sectional view showing a hot pressure welding device using a rotary cutting tool.

3A and 3B are diagrams showing a mode of joining, wherein FIG. 3A is a diagram showing a case where a joint part is cut obliquely, and FIG. 3B is a diagram showing a case where a joint part is cut stepwise.

FIG. 4 is a view showing a rotary cutting tool for cutting while rotating the rotary cutting tool in the width direction of a rolled steel material, in which (a) is a conical rotary cutting tool, and (b) and (c) are cylindrical rotary cutting tools. It is a figure which shows a tool.

5A and 5B are conceptual diagrams for explaining an example of a method for moving a cutting tool according to the present invention, in which FIG. 5A is a diagram showing movement of the tool during cutting, and FIG. 5B is movement when the tool is retracted after cutting. FIG.

6A and 6B are views showing an example of a cutting tool moving device of the present invention, in which FIG. 6A is a partial sectional view seen from a side surface of a rolling line, and FIG. 6B is a partial sectional view seen from a front surface of the rolling line. Is.

FIG. 7 is a conceptual diagram for explaining an example of a conventional moving method of a cutting tool, (a) shows a movement of the tool during cutting, and (b) shows a position where the tool stands by after cutting. FIG. 3C is a diagram showing movement of the cutting tool at the time of joining with the next rolled steel material.

FIG. 8 is a conceptual diagram for explaining an example of a method for moving a cutting tool according to the present invention.

FIG. 9 is a conceptual diagram for explaining another example of the moving method of the cutting tool according to the present invention.

[Explanation of symbols]

1: Rough rolling mill 2. Intermediate coiler 3. Leveler
4. Crop shear 5. Hot pressure welding device 6. Finishing and rolling mill group 7. High speed shear 8. Down coiler 9. Slab 10. Pressure press
11. Clamp device 12. Stand 13. Table roller 14. Lifting cylinder 15. Rotary cutting tool 16． Lower mold 17. burner
18. Traveling roller 19. Grasping device 20,21. Cutting surface 22. Arbor 2
3. Sleeve 24. Cutting blade 25. Bearing box 26. Sliding table 27. Drive device 28. Tool holder 29. Moving device 30. Information stick 3
1. Underframe 32. Lateral movement device

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI B23C 9/00 B23C 9/00 A (72) Inventor Norio Iwanami Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishishima Kawashima Harima Heavy Industries Co., Ltd. Company Yokohama Engineering Center (72) Inventor Nobuhiro Tazoe 1-19-10 Mori, Koto-ku, Tokyo Ishikawa Shima Harima Heavy Industries Ltd. Koto Office (72) Inventor Shiro Nagata 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Address stone Kawashima Harima Heavy Industries Co., Ltd. Yokohama Engineering Center (56) Reference JP 10-166009 (JP, A) JP 8-71855 (JP, A) JP 7-284815 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21B 45/06 B21B 15/00

Claims (3)

(57) [Claims] 1. When descaling the ends of two rolled steels and then joining and performing continuous hot rolling, a rotary cutting tool is used in a reducing flame atmosphere to descale the hot rolled steels. A method of cutting, wherein a rotary cutting tool is moved in the width direction of the rolled steel material to cut the ends of the two rolled steel materials, then the tool is moved diagonally upward with respect to the rolling direction, and A method of moving a cutting tool at the time of descaling in continuous hot rolling, which is moved diagonally downward with respect to the width direction and the rolling direction and returned to the initial position. 2. When descaling the ends of two rolled steel products and then joining and performing continuous hot rolling, a rotary cutting tool is used in a reducing flame atmosphere to descale the hot rolled steel products. A method of cutting, in which two rotary cutting tools are respectively moved from the end in the width direction of the rolled steel material to the central portion to cut the end portions of the two rolled steel materials, and then the respective tools are rolled in the central portion in the rolling direction. Cutting at the time of descaling in continuous hot rolling, which is characterized by moving it diagonally upward and then diagonally downward with respect to the width direction and rolling direction of the rolled steel and returning it to the initial position. Tool movement method. 3. A slide base to which a bearing box for supporting the rotary cutting tool and a drive device for rotating the rotary cutting tool are fixed,
A cutting device composed of a tool holder, which supports the sliding table so as to be movable in an oblique direction with respect to the rolling direction of the rolled steel material and has a moving device for moving the sliding table, is fixed to the underframe. A cutting tool moving device at the time of descaling in continuous hot rolling, characterized in that the guide rod is supported by penetrating and is connected to a lateral moving device which is also fixed to the underframe.