JP2831141B2 - Power supply clamping device for rolled material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply clamping device for a rough rolled material in a continuous hot rolling line in which rough rolled materials are joined and finish rolling is continuously performed.

[0002]

2. Description of the Related Art When a steel material is hot-rolled, a steel plate having a certain length is usually supplied to a rolling mill intermittently and rolled one by one. In this case, a shape defect occurs at the front and rear ends of the steel sheet, and not only does the product yield deteriorate due to cutting, but also an impact load is applied each time the steel sheet bites into the roll or is discharged from the roll. In addition, there are many opportunities to cause roll flaws, and there are problems such as a cost of replacing the roll and a loss of time for stopping the rolling due to the roll replacement.

[0003] Therefore, a plurality of steel sheets are previously prepared as shown in FIG.
As shown in (a), if the connection is made at the opposing surfaces and the rolling is continuously performed by the rolling rolls 4, the above problem does not occur, and the productivity is greatly improved. As a result, in general, when a relatively thin steel plate (10 mm or less) is subjected to continuous cold rolling or continuous pickling, a method of joining the steel materials 1 and 2 by flash butt welding or the like as shown in FIG. However, in the hot rolling process, the current thickness is as large as 20 to 50 mm.
The current capacity supplied by the transformer 7 and the power supply clamp 5 is insufficient, and it is difficult to join the entire cross-sectional area in a short time.

[0004] Therefore, as shown in FIG.
After the end portions 2 are overlapped, a method has been proposed in which a nail-shaped material 3 is driven or temporarily fixed by welding and then pressed against a rolling roll 4. However, there are various problems with respect to the goal of joining in a short time, and it has not been put to practical use.

SUMMARY OF THE INVENTION The present invention is directed to a power supply clamp for a rolled material, which is capable of joining and rolling the rolled materials in a short time and reliably.
The purpose is to provide a locking device .

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a continuous rolling line for continuously rolling by joining a rear end of a preceding rolled material and a front end of a succeeding rolled material.
The rear end of the preceding rolled material so that only the both ends in the width direction contact
Rolled material whose front and rear rolled materials are cut
Can run in the line direction on both sides of the succeeding rolled material in the width direction
A while with a carriage, on the truck, one of the feeder class
And clamp the other power supply clamp to the one power supply clamp.
To be able to move closer to and away from the pump in the line direction
Two power supply clamps and these two power supply clamps
An after-set cylinder that connects between the two
Clamp each width of the preceding rolled material and the following rolled material
With a hydraulic cylinder for clamping that is pressed and fixed from the
It is characterized by having been done.

[0007]

The contact surface is energized and pressurized while clamping both ends of the preceding rolled material and the succeeding rolled material with the power supply clamp device. Thereafter, when the temperature reaches a pressure at which the contact can be made, the contact surfaces are pressed and joined by a pressure roller or an upset pressure device. In addition, for example, even if the contact surfaces at both ends in the sheet width direction of a rolled material having a sheet width of 700 mm to 2000 mm with a plate having a thickness of 20 mm to 50 mm are set to about three times the sheet thickness, the contact time can be reduced to 5 seconds or less. Can be joined.
The temperature of the rolled material in this case is 900 ° C to 1100 ° C.

[0008]

An embodiment of the present invention will now be described with reference to FIGS. Note that the same parts as in FIGS.
The same reference numerals are given. 1 and 2 mainly show the respective directional surfaces of the leading rolled material 2 and the trailing rolled material 1, and show the shape of the facing surface and the shape of the contact surface 16. FIG. 1 (a1) (a2)
In the case of cutting in a straight line, the end portion of the preceding rolled material (referred to as a preceding material) 2 is cut into a concave shape so as to have projections at both ends,
The leading end portion of the succeeding rolled material (referred to as a succeeding material) 1 is cut in a straight line, and they are brought together. FIGS. 1 (b1) and 1 (b2) show a case where the rolled material is cut into an arc shape, and this shape can cope with a case where the rolled material is intermittently rolled alone. That is, if the shape is an arc, the impact when biting into the roll is reduced and the life of the roll is extended. FIGS. 2 (a1) and 2 (a2) show a case where cutting is performed by changing the radius of curvature between the end of the preceding material 2 and the tip of the following material 1, and the cutting blade structure can be simplified. FIG. 2 (b
1) In (b2), one is an arc shape and the other is a linear shape. Either of them can cope with joining of different width materials.

FIGS. 3, 4 and 5 show an embodiment of the present invention. In FIG. 3, a rail 11 is provided along a line along which a rolled material travels. The bogie 6 having the vehicle travels. In this case, the carriage 6 runs at the same speed as the preceding material 2.

A power supply clamp 5 having an L-shaped cross section is provided on the trolley 6, one power supply clamp 5 is fixed on the trolley 6, and the other power supply clamp 5 is provided on the trolley 6 with respect to the one power supply clamp 5. It is provided so as to be movable on the rail 14 so as to approach and separate along the line direction. The two power supply clamps 5 are connected by an upset pressurizing cylinder 13. The power supply clamp 5 presses and fixes the rolled material from both sides in the width direction by the hydraulic cylinder 12 for clamping. The two power supply clamps 5 are also connected to a power supply, and are connected from the current transformer 7 via a bus bar 9 on the secondary side. In this case, one power supply clamp 5 and another power supply clamp 5 are energized.

In the apparatus shown in FIGS. 3A and 3B, the succeeding material 1 on the table roller 8 is pressed against the preceding material 2 being rolled at a constant speed while increasing the speed. The truck 6 running at a constant speed is fixed to the preceding material 2 and the following material 1 by the power supply clamp 5 by the operation of the clamping hydraulic cylinder 12. Next, the leading material 12 and the following material 1 are brought into contact with each other by the upset cylinder 13 at a certain pressure. Here, a large current supplied from the current transformer 7 is supplied to both ends of the preceding material 2 and the following material 1 through the bus bar 9 and the power supply clamp 5. Here, for example, the current density is 20 to
The conduction time of 100 A / mm ² is 5 to 0.1 seconds. Thereafter, the contact surface 16 at the end in the width direction of the plate is heated by the contact resistance and the volume resistance of the contact surface, and when the temperature reaches a temperature at which press contact is possible, the upsetting force of the cylinder 13 is increased to press the cylinder 13 into contact.
And joining of the following material 1 are completed. Next, the power supply clamp is opened, and the traveling vehicle returns to the initial position and waits for the next joining.

In FIG. 3, the power supply clamp 5 is shown in FIG.
As shown in FIG. 4 (b), the rolled materials 1 and 2 have a U-shaped cross-sectional shape and have a U-shaped cross-sectional shape as shown in FIG. The clamping hydraulic cylinder 17 may be pressed and fixed from above. In the latter case shown in FIG. 4 (b), there is an advantage that the contact area with both ends in the width direction of the rolled material can be increased, and it is not necessary to consider buckling in the width direction. In the drawing, reference numeral 15 denotes a bogie driving device.

In the resistance heating, as shown in FIG. 5, in a state where the preceding material 2 and the following material 1 are in contact with each other on the contact surface and are clamped by the power supply clamp 5, the movement of the preceding material 2 Similarly, a current flows from a power supply (not shown) to a contact surface between the power supply clamps 5 via a current transformer 7 and a bus bar 9 while the carriage 6 moves. In this case, since all the currents need to flow through the contact surfaces, the upset pressurizing cylinder 13 and the power supply clamp and the power supply clamp 5 and the carriage 6 are insulated. After the contact surface has been heated to the temperature at which it can be pressed, the upset cylinder 13 is operated to press the contact surface between the preceding material 2 and the following material 1 into pressure.

FIG. 6 is a diagram showing a possible range for joining a rolled material at 900 ° C., in which the vertical axis shows the current density and the horizontal axis shows the relationship of the energizing time. Therefore, in order to set the target joining time to 5 seconds or less, the current density must be 20
It turns out that A / mm ² or more is necessary.

[0015]

As described above, according to the present invention, since the contact surface is formed, the contact surface is electrically connected to the contact surface, and the contact surface is pressed by the upset cylinder while moving on the bogie. Can be connected in a short time and reliably, and the efficiency can be improved by the direct voltage.It is only necessary to put the current transformer on the traveling device, so that the size and weight can be reduced. It can also serve as a simpler apparatus than other methods. Also,
Since the joining position is at both ends of the wide-width rolled material, it is less susceptible to interference with the table roller, and it is easy to change from continuous hot rolling to badge rolling.

[Brief description of the drawings]

FIG. 1 is a view showing an end shape of a rolled material.

FIG. 2 is a view showing an end shape of a rolled material to be joined.

3 is a block diagram for the present onset Ming embodiment.

FIG. 4 is a configuration diagram showing types of power supply clamps.

FIG. 5 is a diagram showing a current-carrying state.

FIG. 6 is a graph showing an example of joining conditions of a rolled material.

FIG. 7 is an explanatory view of a conventional joining method.

FIG. 8 is an explanatory view of a joint surface required for rolling and a conventional flash butt welding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Trailing material 2 Leading material 4 Rolling roll 5 Power supply clamp 6 Dolly 7 Current transformer 9 Bus bar 11,14 Rail 12,17 Hydraulic cylinder for clamping 13 Upset pressurizing cylinder 16 Contact surface

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroharu Hayashi 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Works (56) References JP-A-4-89178 (JP, A) (58) Field surveyed (Int.Cl. ⁶ , DB name) B21B 1 / 26,15 / 00 B23K 9 / 025,11 / 02,11 / 26,20 / 00 H05B 3/00

Claims (1)

(57) [Claims] In a continuous rolling line in which a rear end of a preceding rolled material and a leading end of a succeeding rolled material are joined and continuously rolled, the preceding rolled material is contacted only at both ends in the sheet width direction. rear
Pre-rolling where the end and the leading end of the succeeding rolled material are cut
Can run in the line direction on both sides in the width direction of the material and subsequent rolled material
While with the ability dolly, on the trolley, fixed other supply one of the power supply clamp
Line clamp with respect to one of the power supply clamps
Two power supply
And an upset that connects the two power supply clamps.
The upper cylinder and the above two power supply clamps.
Press and fix from the width direction of the preceding rolled material and the succeeding rolled material
Power supply clamp for rolled material on which a hydraulic cylinder for clamping is mounted
Lamp device .