JPH04262804A - Production of metal plate - Google Patents

Abstract

PURPOSE:To manufacture a metal plate. CONSTITUTION:After the tail end of a preceding metal plate 2 and the tip of the succeeding metal plate 1 which are rolled with a hot roughing mill 11 are heated and joined while moving them between the hot roughing mill 11 and a hot finishing mill 13, they are hot finishing rolled as they are with the hot finishing mill 13. Operation control of rolling mill is made easy by continuating the hot rolled sheets and stabilization and improvement of productivity, improvement of yield and manufacture of homogeneous rolled product are made possible.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plate by joining a preceding plate and a trailing plate and hot finishing rolling them.

0002

[Prior Art] In recent years, in the rolling industry, a continuous hot rolling method has been introduced for hot rolling metal plates, in which metal plates are joined together and rolled as one continuous plate. In order to make this method a reality, various methods have been proposed for joining techniques for hot rolled plates. FIG. 6 is a cross-sectional view showing the basic steps of a conventional method for joining hot rolled plates disclosed in, for example, Japanese Patent Application Laid-Open No. 60-213381. In the figure, 1 is the trailing plate, 2 is the leading plate, 1a, 2
a is the plate end of each plate material 1, 2, 3 is a flux, and 4 is a welded part.

Next, a method for joining plate materials will be explained. The leading plate material 2 and the trailing equipment 1 have their opposing ends 2a
, 1a are inclined and when both are joined to each other, 2
It is shaped so that a welding groove-shaped space is formed between a and la. The bottom of this groove-shaped space is temporarily welded to join both plate materials 1 and 2 at the welded portion 4. Next, flux 3 is sprinkled on the remaining portions of the unwelded ends 1a and 2a in order to remove oxide scale and activate the surfaces to facilitate pressure welding. Next, when both the plates 1 and 2 are hot-rolled, sufficient rolling force is applied to form a streamline joint surface where the plates 1 and 2 overlap as shown in FIG. are rolled and completely joined to form a single piece.

0004

[Problems to be Solved by the Invention] Since the conventional method for producing plate materials is carried out as described above, the leading plate material and the trailing plate material to be welded are transported at a high speed of approximately 90 m/min, and moreover, the welding material is transported at a high speed of about 900 °C to 1100 °C. Due to the high temperature (℃), there was a problem in how to perform temporary welding.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a plate material for temporarily joining the tail end of a preceding plate material and the leading end of a trailing plate material, which are transported at high speed and at high temperatures.

[0006]

[Means for Solving the Problems] A method for manufacturing a plate according to the present invention involves rolling the tail end of a preceding plate and the tip of a trailing plate using a heating device between a hot rough rolling mill and a hot finishing mill. After the tail end of the leading plate material and the leading end of the trailing plate material are joined together by heating while moving, hot finishing rolling is performed in a hot finishing rolling mill.

[0007]

[Operation] In the manufacturing method of the present invention, the leading plate material and the trailing board material are transported at the same speed, and the tail end of the leading board material and the leading end of the trailing board material can be joined by a heating device that can move in accordance with the transport speed. The temperature is raised to a high temperature, the tail end of the leading plate material is joined to the tip of the trailing plate material using a joining device, and hot finish rolling is carried out in a hot finishing mill, thereby eliminating the need for continuous hot rolling and achieving hot finishing. Rolling is carried out continuously in a rolling mill.

[0008]

[Example] Example 1. An embodiment of the present invention will be described below with reference to the drawings. Figure 1
- In FIG. 5, 11 is a hot rough rolling machine, 12 is a plate end face cutting machine, 13 is a hot finishing rolling machine, and 14 is a plate material 1, 2.
15 is a carriage that can move on rails 16 in synchronization with the conveyance speed of the plates 1 and 2; 17 is a carriage 1;
As the heating device installed in 5, an induction heating device or the like is used. 18a and 18b are joining devices mounted on the truck 15.

Reference numeral 19 denotes a joining device 18 for the tail end of the preceding plate material 2.
a to the rail 2 by the cylinder 20 in the direction perpendicular to the line.
1 a trolley for moving the heating device 17 on a rail 23; 22 a cylinder for moving the heating device 17 on a rail 23 in a direction perpendicular to the line;
24 is a power cable that supplies power to the heating device 17;
5 is an alignment plate, 26 is a cylinder for opening and closing the clamper 27, and 28 is a cylinder for upsetting the trailing plate material 1, which moves the joining device 18b on the rail 29 in the direction of the alignment device 18a. 30 is a cart for moving the joining device 18b on the rail 31 in a direction perpendicular to the line;
2 is a cylinder for moving the cart 30.

Next, the operation will be explained. In the figure,
The trailing plate material 1 roughly rolled by the hot rough rolling mill 11 is conveyed on the conveying table 14 so that the distance between the tip of the trailing plate material 1 and the tail end of the leading plate material 2 is approximately 0 to several tens of mm. The conveyance is controlled. Furthermore, the conveyance speed is synchronized with that of the preceding plate material 2, and the vehicle enters the zone of the trolley 15 on which the heating device 17 and the joining devices 18a, 18b are mounted. At this time, the tail end of the leading plate material 2 and the tip of the trailing plate material 1 are cut into a shape that can be joined by an end face cutter 12 installed between the hot rough rolling mill 11 and the trolley 15.

When the tail end of the leading board 2 and the tip of the trailing board 1 enter the zone of the truck 15, the center of the distance between the tail end of the leading board 2 and the leading end of the trailing board 1 is located at the heating device 17. The trolley 15 is moved by, for example, a servo motor drive device (not shown) so as to be at the center of the image. After that, it moves in synchronization with the conveyance speed of the preceding plate material 2 and the trailing plate material 1 until the tail end of the preceding plate material 2 and the leading end of the trailing plate material 1 are completely joined.

The heating device 17 and the welding device 18 are placed in the center of the heating device 17 mounted on the trolley 15 until the tail end of the leading board 2 and the leading end of the trailing board 1 are set at predetermined positions.
a, 18b have completed their movement from the off-line position to the position for heating or joining the preceding plate material 2 and the trailing plate material 1 by the cylinders 20, 22, and 32. Next, when the cart 15, the tail end of the leading plate material 2, and the tip of the trailing plate material 1 are set at predetermined positions, the upper and lower clampers 27 of the joining devices 18a, 18b are closed by the cylinders 26, and the leading plate material 2 and the trailing plate material 1 are closed. Clamp the row board 1.

Next, the tail end of the leading plate material 2 and the tip of the trailing plate material 1 are heated by induction using the heating device 17, and the joining heating temperature (
The temperature of the plate material is raised from about 1000°C to about 1400°C. ). In the case of the induction heating device of this embodiment, a predetermined amount of power is supplied to the heating device 17 from a heating power source (not shown) via a power factor improvement matching board 25 mounted on a trolley 15 and a power cable 24. . Heating device 17 after heating completion
is retracted offline by cylinder 22.

Next, the joining device 18b that clamps the trailing board 1 side is moved to the leading board 2 side by the cylinder 28, and the tail end of the leading board 2 and the tip of the trailing board 1 are upset and both are separated. After joining the plates 1 and 2, the clamper 27 is released. Then, the joined plate materials 1 and 2 are directly passed through a hot finishing rolling mill 13 to perform hot finishing rolling.

Example 2. In the above embodiment, one trolley 15 is placed on each side of both end faces of the plates 1 and 2 (drive side and operator side of the conveyor line), but one trolley is provided with a heating device 17 that can satisfy the above functions. The joining devices 18a and 18b are 1
If the set is satisfactory, the cart 15 may be placed only on one side.

Example 3. Although the heating device 17 was an induction heating device in the above embodiment,
For example, similar effects can be obtained by using other heating means such as electrical heating and gas heating.

Furthermore, in the above embodiment, the heating device 1
In 7, the leading board 2 and trailing board 1 are combined into one set so that they can be heated simultaneously, but two sets of heating devices for heating the leading board 2 and trailing board 1 separately are mounted on the trolley 15. Good too.

Example 4. In the above embodiment, the method of upsetting and joining the tail end of the preceding plate material 2 and the tip of the trailing plate material 1 after heating was explained. A method may also be used in which the tip of the plate material 1 is upset and then heated and joined.

Example 5. Although the welding device 18a in the above embodiment was moved only in the direction perpendicular to the line, it may have the same function as the welding device 18b in order to pull the preceding plate material 2 toward the preceding plate material 1 during upsetting.

Further, although a cylinder was used as the actuator in the above embodiment to provide power during clamping and upset, other known actuators (such as a motor) may also be used, and the mechanism may also have a known function (such as a link, etc.). ) can also have the same function.

Example 6. In the above embodiment, the drive device for the trolley 15 is a servo motor drive device, but other known actuators (such as a DC motor,
It goes without saying that other motors (vector control motors, hydraulic servo systems, etc.) have similar functions.

[0022]

[Effects of the Invention] As described above, according to the present invention, the tail end of the leading plate and the tip of the trailing plate are heated while moving between the hot rough rolling mill and the hot finishing mill. By joining them together, it becomes possible to carry out hot finishing rolling as is in a hot finishing rolling mill, making it possible to continuously roll hot rolled steel sheets.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a state during heating and bonding according to an embodiment of the present invention.

FIG. 3 is a side view showing essential parts of an embodiment of the present invention.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a sectional view taken along line V-V in FIG. 3;

FIG. 6 is a cross-sectional view showing a state of temporary welding in a conventional hot-rolled plate joining method.

7 is a sectional view showing the state of the hot rolled plate of FIG. 6 after hot rolling; FIG.

[Explanation of symbols]

1 Trailing hot rolled material 2 Preliminary hot rolled material 11 Hot rough rolling mill 13 Hot finishing rolling mill 15 Trolley 17 Heating device 18a Bonding device 18b Joining device

Claims (1)

[Claims] Claim 1: Between a hot rough rolling mill and a hot finishing mill, while moving the tail end of the preceding plate rough rolled by the hot rough rolling mill and the leading end of the trailing rolled plate. A method for producing a plate material, which comprises heating and joining using a heating device, and then subjecting the material to hot finishing rolling using the hot finishing rolling mill described above.