JPS6253242B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot rolled material connection method suitable for use in a hot rolling line.

FIG. 1 is an explanatory diagram showing a conventional hot rolling line. Slabs as rolling materials are extracted one by one from a heating furnace 1 and rolled to a predetermined thickness in a rough rolling mill group 2 to become sheet bars. The strip is further thinned into a strip by a finishing mill group 3, and then wound into a coil by a coiler 4.

In such a conventional hot rolling line,
Since the rolling material is rolled by discontinuous rolling in which the rolled material is rough-rolled and finished-rolled one by one, there are the following problems. That is, each rolled material needs to be smoothly bitten by the upper and lower rolls of the rough rolling mill group 2 and the finishing rolling mill group 3, and it is necessary to adjust the tip shape, plate thickness, etc. of each rolled material. Furthermore, since the temperature decreases at the leading and trailing ends of each rolled material, the quality of the product material becomes non-uniform. Moreover, between the preceding rolled material and the following rolled material,
This results in the existence of a space where rolling operations are not carried out, resulting in problems such as low effective utilization of equipment and poor production efficiency.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a method for connecting hot-rolled materials that enables continuous rolling in a hot-rolling line.

In order to achieve the above object, the present invention provides a method for connecting hot rolled materials by using a joining machine to join a preceding rolled material and a subsequent rolled material that are being transported by a transport table. Each table roller to be formed is retracted from the rolled material transport position to a position where it will not interfere with the joining machine when passing through the joining machine, and after passing through the joining machine, it is moved back from a position where it will not interfere with the joining machine to the rolled material transport position. It was designed to make a comeback.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is an explanatory diagram showing an example of hot rolling equipment to which the hot rolled material connecting method according to the present invention is applied. A slab as a rolled material extracted from a heating furnace (not shown) is roughly rolled in a rough rolling mill 11 equipped with work rolls 11A and back-up rolls 11B, and becomes a sheet bar. The sheet bar is conveyed while being supported by a large number of table rollers 13 forming a conveyance table 12, and sent to a finishing mill 14. The sheet bar fed into the finish rolling mill 14 is finish rolled by a work roll 14A and a back up roll 14B.
After being made into a strip, it is wound into a coil by a coiler (not shown).

Further, between the rough rolling mill 11 and the finishing rolling mill 14, a conveying table 1 is installed on rails 15.
A welding machine 16 such as a flash welding machine is disposed, which is movable in the direction of conveying the rolled material by 2. The joining machine 16 moves in synchronization with the rolling material conveyance speed of the conveying table 12, and clamps the rear end of the preceding rolled material 31 with its exit side clamp 17, and clamps the rear end of the preceding rolled material 31 with its entry side clamp 18. The tip of the rolled material 32 is clamped, the rear end of the preceding rolled material 31 and the tip of the subsequent rolled material 32 are joined, and the continuous rolled material can be continuously rolled in the finishing mill 14.

Here, each table roller 13 forming the conveyance table 12 is formed as shown in FIG. 3 and FIG. After passing the joining machine 16, it is possible to return to the rolled material conveying position from a position where it does not interfere with the joining machine 16. That is, guides 22 are formed on the frame 21 of the conveyance table 12 at positions corresponding to each table roller 13.
An elevating table 23 is disposed on each guide 22 so as to be movable up and down by an elevating cylinder device 24 . A table roller 13 is supported on each lifting table 23 via a bearing 25. The table roller 13 moves up and down together with the lifting table 23, and is movable between the rolled material conveyance position and a position where the exit clamp 17, entry clamp 18, etc. of the joining machine 16 do not interfere with each other. In addition,
The table roller 13 is connected to an electric motor 27 via a coupling ring 26, and is capable of conveying the rolled material at a predetermined conveyance speed at the rolled material conveying position.

Next, the operation of the above embodiment will be explained. The joining machine 16 parked on the rough rolling mill 11 side starts moving toward the finishing rolling mill 14 side along the rail 15 at the time when the pre-rolled material 31 is sent out from the rough rolling mill 11. When the moving speed of the joining machine 16 is synchronized with the moving speed of the preceding rolled material 31, the outlet clamp 17 clamps the rear end of the preceding rolled material 31. Further, immediately after the preceding rolled material 31 is sent out from the rough rolling mill 11, the subsequent rolled material 32
is fed into a rough rolling mill 11 and sent out in a rough rolled state. The subsequent rolled material 32 sent out from the rough rolling mill 11 is accelerated and gradually approaches the preceding rolled material 31, and when the tip of the subsequent rolled material 32 reaches a state where it comes into contact with the rear end of the preceding rolled material 31. , the joining machine 16 clamps the leading end of the subsequent rolled material 32 with the entry side clamp 18, and joins the rear end of the preceding rolled material 31 and the leading end of the succeeding rolled material 32 in a butt state. Furthermore, after joining the preceding rolled material 31 and the subsequent rolling material 32, the joining machine 16 deburrs the joint, and then reaches the finishing rolling mill 14 side.

When the preceding rolled material 31 and the subsequent rolled material 32 are joined by the joining machine 16, the lifting cylinder device 24 corresponding to each table roller 13 forming the conveying table 12 is arranged corresponding to each table roller 13. It is activated when a detector (not shown) detects the approach of the joining machine 16, and the table roller 13 is retracted from the rolled material conveying position to a position where the exit side clamp 17, entry side clamp 18, etc. of the joining machine 16 will not interfere. Elevating table 2
3 is lowered along the guide 22 of the frame 21. In this way, each table roller 13 evacuated from the rolled material conveying position when passing through the joining machine 16
After passing the welding machine 16, returns to the rolled material conveying position from a position where it does not interfere with the welding machine 16,
The rolled material is transported again.

Note that the joint end surfaces of the preceding rolled material 31 and the subsequent rolled material 32 may be formed by placing a running shear on the exit side of the rough rolling mill 11, or by a rotary type shear installed in the joining machine 16. It may also be formed using a shearing machine.

According to the above embodiment, the joining machine 16 that joins the preceding rolled material 31 and the subsequent rolled material 32 is synchronized with the preceding rolled material 31 and the subsequent rolled material 32 without interfering with each table roller 13 of the conveying table 12. By moving and joining the preceding rolled material 31 and the subsequent rolled material 32, it becomes possible to continuously roll the rolled material in the finishing mill 14. Therefore, compared to the case where the rolled material is rolled one by one intermittently, it is possible to reduce the frequency of impacts that occur when the rolled material is caught in the rolls, and to reduce the occurrence of roll damage accidents caused by the impact. In addition to being able to prevent this, it is also possible to stabilize the rolling state and control the plate thickness and shape with high precision. In addition, the generation of spaces between each rolled material when intermittent rolling is performed one by one is eliminated, increasing the production capacity of the equipment.
This can be improved by about 1.5 times, and the idle operation of electric motors, auxiliary equipment, etc. can be reduced, making it possible to improve the electric power consumption rate. Furthermore, since the tension of the rolled material in the finish rolling mill 14 can be stably controlled, tension rolling in hot rolling becomes possible, and thin material rolling can be performed satisfactorily.

FIG. 5 is an explanatory diagram showing a deformed side of the retracting means of the table roller 13 from the rolled material conveying position in the above embodiment. That is, each table roller 13 is pivotally supported by a swing arm 32 that is swingably supported by a frame 31.
can be swung by the operation of a swiveling cylinder device 33. That is, when passing through the joining machine, the swinging arm 3 is moved by the contraction operation of the swinging cylinder device 33.
2, the table roller 13 can be retracted from the rolled material conveying position to a position where it will not interfere with the joining machine. In addition, after passing through the joining machine,
The swinging arm 32 is swung by the extension operation of the oscillating cylinder device 33, and the table roller 13 can be returned to the rolled material conveying position from a position where it will not interfere with the joining machine.

In addition, in the above embodiment, the case where the joining machine 16 is installed between the rough rolling mill 11 and the finishing rolling mill 14 has been explained, but the joining machine is installed between the heating furnace and the rough rolling mill. It's okay to be.

As described above, the present invention is a hot rolled material connecting method in which a previously rolled material and a subsequent rolled material that are being transported by a transport table are joined by a joining machine, and each of the hot rolled materials forming the transport table is The table roller is designed to retreat from the rolled material transport position to a position where it will not interfere with the joining machine when passing through the joining machine, and return to the rolled material transport position from a position where it will not interfere with the joining machine after passing through the joining machine. This has the effect that continuous rolling is possible in a hot rolling line.

[Brief explanation of the drawing]

Figure 1 is a layout diagram showing a conventional hot rolling line;
FIG. 2 is a side view showing an example of hot rolling equipment to which the hot rolled material connecting method according to the present invention is applied, FIG. 3 is a front view showing a conveyance table used in the hot rolling equipment, and FIG. The figure is a sectional view taken along the - line in FIG. 3, and FIG. 5 is a side view showing a modification of the conveyance table shown in FIGS. 3 and 4. 11... Rough rolling mill, 12... Conveyance table, 13...
Table roller, 14... Finishing rolling machine, 16... Joining machine, 23... Elevating table, 24... Elevating cylinder device.

Claims (1)

[Claims] 1. A hot rolled material connection method in which a preceding rolled material and a subsequent rolled material that are being transported by a transport table are joined by a joining machine, in which each table roller forming the transport table is A method for connecting hot rolled materials, in which the rolled material is evacuated from a rolled material conveying position to a position where it will not interfere with a joining machine, and after passing through the joining machine, it returns to the rolled material conveying position from a position where it will not interfere with the joining machine.