JPH02220708A - Heating-cooling equipment for hot rolling line - Google Patents

Abstract

PURPOSE:To shorten the length of a rolling line by mounting a heating and a cooling device connected in parallel freely movable on a supporting device provided on the inlet side of a row of finish rolling mills and moving them respectively between a position agreeing with the line and a position far from the line. CONSTITUTION:On the inlet side of a train of the finish rolling mills in a rolling line 100 is provided a supporting device 30 intersecting at right angles to the line 100. The heating 9 and the cooling device 10 connected in parallel are mounted freely movably on the supporting device 30. The heating and the cooling device 9, 10 are moved by a driving device 40 respectively between a position agreeing to the line 100 and a position far from the line 100. The heating and the cooling device 9, 10 change their respective positions according to the specification of the rolled stock. By this method, various kinds of hot rolled steel plates can be manufactured without reducing the production.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to heating and cooling equipment that enables efficient rolling of materials that require rapid cooling and materials that require heat retention or heating in a hot rolling line. It is.

(b) Prior art In recent years, hot rolling lines have been using
The method used is to heat the slab at a low temperature to prevent temperature drop in the rolling line as much as possible. In particular, the plate of the rolled material is as thin as 25 to 60 mm on the entry side of the finish rolling process after rough rolling.
Further, since the speed on the inlet side is slow at 40 to 100 a/sin, the temperature drop of the rolled material is large at 20 to 100°C.

Fig. 6 shows a conventional hot rolling line. Between the rough rolling mill row 1 and the finishing rolling mill row 2, there is a crop shear 3 for cutting unnecessary lobes at the front and rear ends of the rolled material, and a crop shear 3 for cutting unnecessary lobes at the front and rear ends of the rolled material. There is also a decooler 4 using high pressure water to remove scale.

Furthermore, a heat retaining cover 5 is installed to reduce the temperature drop. In addition, on the entry side of the finish rolling process, a coil box 6 is installed to reduce the temperature drop by making the rolled material into a coil.
Some lines are equipped with This coil box 6
Since the rolled material can be rolled up immediately after rough rolling, the distance between the rough rolling mill row 1 and the finishing rolling mill row 2 can be shortened by a1m%]
There is also a shrinking effect.

Even if a coil box is used, the temperature drop of rolled material is
Some lines are equipped with edge heaters 7 that are particularly large at the edges in the width direction of the rolled material and actively heat the edges.

Recently, the uses of hot-rolled steel sheets have diversified, and hot-rolled steel sheets with high ductility are also desired. This means that 200 to 40
It is necessary to rapidly cool it to 0°C. However, conventional lines cannot perform rapid cooling, and simply installing a cooling device is effective for the materials that require rapid cooling, but
For materials that require heat retention, even if the water in the cooling device is stopped, the temperature of the rolled material will drop due to contact with conveyance rollers that have been cooled by air cooling or water cooling while passing through the cooling device. There is.

In equipment that has both heating or heat retention and cooling functions, for example, when the cooling water hits the heat insulation cover and switches from the quenching material to the heat insulation material, the first few rolled materials have no heat retention effect at all, and The lifespan of the heat insulating cover is extremely short. Naturally, due to space constraints, a heating device cannot be incorporated.

(c) The problem to be solved by the present invention is to provide equipment that can effectively produce materials required for rapid cooling and materials required for heat retention or heating in a hot rolling line. It's about getting.

(d) Means for Solving the Problems The heating/cooling equipment for a hot rolling line of the present invention is provided with a support device perpendicular to the line on the entry side of a row of finishing mills in the hot rolling line, and A driving device in which a heating device and a cooling device are connected in parallel and movably mounted on the device, and each of the heating device and the cooling device is moved between a position corresponding to the line and a position outside the line. The above-mentioned problem is solved by providing a means for switching the positions of the heating device and the cooling device based on the specifications of the rolled material.

(E) Function The present invention switches between a heating device and a cooling device in a hot rolling line depending on materials required for heating or heat retention and materials required for quenching. The equipment is such that a heating device and a cooling device are installed on separate carts, and the carts are moved in a direction substantially perpendicular to the direction of the rolling line to switch between them.

(F) Embodiment An embodiment of the heating/cooling equipment of the present invention will be described with reference to FIGS. 1 to 5.

Hereinafter, for convenience of explanation, the heating/cooling equipment of the present invention is applied to a hot rolling line in which a row of rough rolling mills and a row of finishing rolling mills are connected by a coil box. However, recently, continuous casting technology for thin slabs has advanced, and there are hot rolling lines that omit the rough rolling mill row. Even in a line in which the No. 11 rolling mill row is omitted, the equipment of the present invention can be applied to the entry side of the finishing rolling mill row.

FIG. 1 shows a hot rolling line 100 in which the present invention is implemented. A rolled material rolled in a row of rough rolling mills 1 passes through a heat insulating cover 5 and is wound into a coil in a coil box 6. Thereafter, the rolling machine is unwound by an unwinding machine 6', and unnecessary lops at the leading end of the rolled material are cut off by a crop shear 3. Furthermore, the rolled material is heated and cooled using the heating/cooling equipment 8 of the present invention, mechanical
It passes through a descaler 4 (for example, a brush roll) and is rolled in a finishing mill row 2.

FIG. 2 shows a plan view of the vicinity of the heating/cooling equipment 8 of the present invention. The heating/cooling equipment 8 includes a heating device 9, a cooling device 10,
It is made up of a support device 30 and a drive device 40. The heating/cooling equipment 8 is provided with a support device 30 that runs perpendicular to the hot rolling line 100, and is movable by connecting the heating device 9 and the cooling device 10 in parallel on the support device 30 by a connecting member 11. A driving device 40 is provided to move the heating device 9 and the cooling device 10 between a position corresponding to the line 100 and a position outside the line, respectively, and the heating device 9 and the cooling device 10 are moved based on the specifications of the rolled material. Switch the position of.

As shown in FIG. 3, the heating device 9 includes a truck frame 16 with a heat insulating material pasted on its inner surface, conveyance rollers 15 for conveying the rolled material 13, and edge heaters 14 and 14'.
Consisting of When actively heating the rolled material 13, electric power is applied to an induction heating type edge heater. In addition, if only heat retention is required, reduce the output of the edge heater or turn it off and use insulation material to retain heat.

Next, in the case of materials requiring rapid cooling, the heating/cooling installation 118 is moved in the direction shown in FIG. 2(B), and the cooling device 10 is installed in the rolling line 100. The cooling bags W, 10 have a structure in which a withdrawal roller 21 and a cooling pipe 20 are provided within a truck frame 19. A large number of water jet nozzles 22 are provided at the tip of the cooling pipe to rapidly cool the rolled material.

In this embodiment, the support device 30 is made up of a pair of rails 12. Wheels 1 are installed at the bottom of the heating device 9 and the cooling bag W10.
7.18 is provided so that it can be moved left and right on the rails 12 using a trolley system. Further, a connecting member 11 is provided between the heating device 9 and the cooling device 10 so that they can move in the same manner.

FIG. 4 shows another embodiment of the heating device 9. The heating means is a direct fire burner 23, and in the case of burner heating, it is possible to heat not only the width ends of the rolled material plate but also the center of the plate width. . Furthermore, by setting the air ratio of the burner to 1.0 or less, scale generation can be suppressed.

Note that the cooling method of the cooling device 10 may be any method such as a water film method, a mist cooling method, or a bilamina method.

An embodiment of the drive device 40 is shown in FIG.
(B) or reinstall with endless chain 459.1
0 at the same time (C), the rack-binion mechanism 46 moves the device 9.1o again (D), or the overhead traveling trolley 47.48 pulls each device 9.10 (D).
E) It may be done as follows.

For rolled materials that require heating or heat retention before finishing rolling, a heating device 9 is installed at a position aligned with the rolling line 100, as shown in FIG. 2(A). For rolled materials that require rapid cooling, a heating device 9 and a cooling bag are used as shown in FIG. 2(B). 10 along the rail 12,
Next, when the cooling device 10 is installed in the same position as the rolling line 100, the arrangement shown in FIG. 2(A) is used when materials that need to be heated or heat-retained come again.

By switching the heating device 9 and the cooling bag 10 according to the rolled material in this way, it is possible to easily use heating or heat retention and rapid cooling.

With the above-mentioned equipment, the plate thickness is 15 to 60 mm and the plate width is 900 mm to 90 mm.
It is possible to finish roll a rolled material of 1600n+n without any temperature drop, rather raising the temperature at the edge of the plate by 50°C, and for materials that require quenching, the temperature cannot be lowered by 200 to 400°C. The changeover time was less than 20 seconds, which was achieved without reducing production.

(G) Effects According to the present invention, by selectively using heating or heat retention and rapid cooling, various hot rolled steel sheets can be manufactured with inexpensive equipment without reducing production volume. Further, by arranging the heating or heat retention device and the quenching device in parallel, the length of the rolling line can be shortened.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of a configuration in which the heating/cooling equipment of the present invention is installed in a conventional hot rolling line, and Fig. 2 is a schematic illustration of a configuration in which the heating/cooling equipment of the present invention is installed in a conventional hot rolling line.
FIG. 3 is a side view of FIG. 2, FIG. 4 is a side view of another embodiment of the present invention, and FIG. 5 shows various embodiments of the drive device used in the facility of the present invention. Explanatory drawing, FIG. 6 is an explanatory drawing of a conventional hot rolling line. 1: Roughing mill row 3: Crop shear 5: Heat insulation cover 7: Edge heater 9: Heating device 11: Connecting member 30: Support device Finishing rolling mill row decooler: Coil box heating/cooling equipment Cooling device Rail drive device 2: 4: 6, 6' 8: 10: 12: 40: Patent applicant Sumitomo Metal Industries, Ltd. (4 others) Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] In the hot rolling line, a support device is provided perpendicular to the line at the entry side of the finishing rolling mill row in the rolling line, and a heating device and a cooling device are connected in parallel and movably mounted on the support device. and a driving device for moving the heating device and the cooling device respectively between a position coincident with the line and a position outside the line, and the positions of the heating device and the cooling device are adjusted based on the specifications of the rolled material. Heating/cooling equipment for a hot rolling line characterized by switching.