JPH0484608A - Trimming method of steel sheet in endless hot rolling - Google Patents

Abstract

PURPOSE:To manufacture a trimmed coil in hot rolling process by connecting a narrow steel sheet to at least the front stage of steel sheet to be trimmed and trimming the sheet by arranging slitters in front of a cutting machine in endless hot rolling. CONSTITUTION:At the time of manufacturing a product coil by joining plural steel sheets 101 upstream the inlet of a finishing mill 103, the production of the trimmed coil is executed with the slitters 107a, 107b to an arbitrary coil from a 2nd coil on. Trimming is successively executed from a narrow width product to a wide width product. Therefore, the narrower sheet than the target width of steel sheet to be trimmed is beforehand joined as the steel sheet on the front stage. And, when plural steel sheets are continuously trimmed, a steel sheet to be trimmed into narrower width is placed on the upstream side, the slitter 107b for wide width is worked and simultaneously the slitter 107a for narrow width is separated from the steel sheet when switching trimming width. At this time, operation can be easily done by providing plural trimming devices of which the positions in the width direction and vertical direction are optionally adjustable.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves connecting roughly rolled steel sheets upstream of a finishing mill, continuously hot finish rolling them, and cutting them after rolling to wind them into coils. This invention relates to a method for cutting edges of a steel plate during endless hot rolling.

rPrior art] Conventional edge cutting of the edge of a steel plate is carried out in two processes: (1) a hot rolling process and an edge cutting process, and edge cutting is performed using a slitter.

In this case, there is a problem in that the process for cutting the edges requires additional days and costs.

(2) A method of performing width direction rolling similar to edge cutting while hot rolling is described in Japanese Patent Application Laid-Open No. 59035804, as shown in Fig. 3.
A method of controlling the shape of the root end of the strip by disposing an edger 4 between a and 3b is disclosed, and furthermore, Japanese Patent Laid-Open No. 6301. OO No. 1,0 discloses a strip edger 5 disposed immediately adjacent to the exit side of a finishing mill. With this conventional technique, it is not possible to obtain width dimension accuracy equivalent to that obtained by edge cutting using a slitter.

[Problem to be solved by the invention 1 The present invention aims to perform edge cutting in the same process as hot finish rolling, and by using endless rolling technology,
It is an object of the present invention to make it possible to reduce the process to one step, and to perform edge cutting with the same width dimension accuracy as edge cutting using a normal slitter.

[Means for Solving the Problems] In the hot endless rolling of a steel plate, the present invention connects a narrow steel plate at least upstream of the steel plate to which edge cutting is to be performed,
This is a method for edge cutting of a steel plate in endless hot rolling, characterized in that a slitter is disposed in front of a cutting machine to perform edge cutting.

[Operation] When manufacturing a product coil by joining a large number of steel plates upstream of the finishing rolling mill, an edge-cutting device is used to produce edge-cut coils for any coils after the second coil.

The edges are cut from the narrowest products to the widest products. Therefore, the width of the steel plate preceding the steel plate to be edge-cut is narrower than the target width of the steel plate to be edge-cut. Also,
When cutting edges on multiple steel plates in succession, place the steel plate to be edge-cut into a narrow width on the upstream side, and at the time of edge cutting width switching, operate the wide slitter and at the same time cut the narrow slitter away from the steel plate. Pull apart.

Because of this method of using the slitter, it is preferable that the first grain strip be narrow and neat in view of the entire endless rolling process.

The above operation can be easily performed by installing a plurality of edge cutting devices whose widthwise positions and vertically positions can be arbitrarily adjusted. Further, the edge cutting device may be installed between the stands of the finishing rolling mill.

Note that even after the rear end of the steel plate at the tail end leaves the finishing mill, it is still being pulled between the pinch rolls and the slitter, so that it can be edge-trimmed.

Embodiment 1 FIG. 1 shows an arrangement of an embodiment of the present invention. A large number of steel plates 101 are joined upstream of a finishing rolling mill 103 and endlessly rolled. The steel plate 101 that has been finish rolled in the finishing mill 103 passes through pinch rolls 106, is cut by a cutter 105, and is wound up in a winder 104. The steel plates 101 other than the leading steel plate and the tail steel plate are placed under tension from the outlet of the finishing mill 103 to the pinch rolls 106.

Single-blade slitter 107a, 1.07b of the present invention.

is installed close to the pinch roll 106 immediately before the cutting machine l○5. This single-blade slitter can be moved in the width direction and in the vertical direction at any time.

Edge cutting was performed by joining a narrow steel plate in front of the steel plate to be edged.

Table 1 shows examples of the present invention. The results are shown in which 8 steel plates were joined in front of a finishing mill to produce 10 coils. In Table 1, there are steel plates that are not edge-trimmed, and the reason for this is due to customer requests.

Steel plate 1 with edge cuts 17 and 18 as shown in Fig. 2(a).
If 2.14 is always sandwiched between steel plates 1113.1.5 or the like without edge cutting, only one set of edge cutting devices may be required. In this case, the slitter is operated from the rear end of the steel plate 11, and the operation of the edge cutter 17 is continued until the tip of the steel plate 13. Furthermore, while the steel plate 13 is being moved, an edge cut 1 is made in the slitter width of the steel plate 14.
Set the width of 8 and cut the edges in the same way.

In addition, when the steel plates 22 and 23 with edge cuts 26 and 27 are continuous as shown in Fig. 2(b), in order to reduce the amount of waste at the joint between the steel plates 22 and 23, it is necessary to change the slitter quickly. It is preferable to do so.

Therefore, multiple selvage devices are required. Therefore, as shown in Table 1 of this embodiment, when manufacturing of coils with edge slits continued, the coils were manufactured while changing the separation and separation of the two slitters. Note that the model of the ear clipping device does not matter. Any type of trimmer type or edge miller type may be used.

〔Effect of the invention〕

According to the present invention, it is possible to manufacture an edge-cut coil in a hot rolling process by omitting an edge-cutting process that is separate from the rolling process, and to produce a hot-rolled coil with a very good width width. I was able to do it.

[Brief Description of the Drawings] Fig. 1 is a schematic side view of the main part of the rolling process used in carrying out the present invention, Fig. 2 is an explanatory view of the aspect of edge cutting of slick, and Fig. 3
The figure is an explanatory diagram of a conventional edger. 101... Steel plate 103... Finishing rolling machine 104... Winding machine 105... Cutting machine 106... Vinci roll

Claims (1)

[Claims] 1. In hot endless rolling of steel plates, a narrow steel plate is connected at least before the steel plate to be edge-cut, and a slitter is disposed in front of a cutting machine to perform edge-cutting. A method for edge cutting of steel plates during endless rolling.