JPS6049045B2 - Cold rolling method of steel plate - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for cold rolling a copper plate.

Generally, in cold rolling of copper plates, the plate width specified by the user is, for example, 750-! 771! If L, the width of the rolled steel plate (hot-rolled steel coil) is determined so that the width of the cold-rolled steel plate is 765 m and 77 l.

Therefore, even if the rolling mill is capable of rolling up to a width of 180←, if the width of the cold-rolled steel plate is, for example, 70 om, 77 l.
There are cases where this happens. On the other hand, the product cost is lowest when rolling is performed up to the specification limit of the rolling mill.
-m! Rolled into a steel plate with Tl width, and after rolling was completed, 1400-
! Energy and labor savings are achieved by dividing a steel plate rolled to a TgII width into two in the length direction to obtain two turns of a 7Oom77l width steel plate coil.

By the way, as mentioned above, when a rolled steel plate is divided into longitudinal sections, there is no problem as a steel plate for general use, but it is a big problem for a steel plate that is later subjected to surface treatment and plating. .

That is, in the case of a steel plate that has been cold-rolled to a width that matches the width specified by the user, symmetrical edge drops 1a are formed at both ends of the steel plate 1, as shown in FIG. on the other hand,
As mentioned above, in the case of a steel plate obtained by dividing a rolled copper plate in the length direction, as shown in FIG. 2, one end of the steel plate 1 has an edge drop 1a, but the other end has an edge drop 1a does not exist.

For example, when galvanizing is applied to a steel plate with a uniform thickness, the thickness of the plating layer 2 at both ends of the steel plate 1 becomes thick (a rise of 100μ or more), as shown in Fig. 3.
Therefore, the plate thickness distribution of the steel plate after plating becomes non-uniform.

Applying this to the copper plate 1 shown in FIGS. 1 and 2, the steel plate 1 shown in FIG. The non-uniform distribution of thickness offsets each other, and the plate thickness distribution after plating becomes almost uniform. However, in the steel plate 1 shown in FIG. 2, the edge drop 1a is formed as shown in FIG. The thickness of the plated layer 2 at the side edges is almost equal to the thickness of the plated layer 2 at the center, but the thickness of the plated layer 2 at the other edge where the edge drop 1a does not exist is greater than that at other parts. It gets thicker.

If a plated steel plate as shown in FIG. 5 is wound into a coil, the coil will have a shape as shown in FIG. 6, which has an adverse effect on product quality and is not acceptable as a commercial product.

The present invention is intended to solve the above-mentioned problems when a steel plate after cold rolling is divided in the length direction, and an example of its implementation will be described below based on FIGS. 7 to 9. do.

As shown in FIGS. 7 and 8, the rolled steel plate (hot-rolled steel plate) 1 being fed out from the payoff reel 11 is No. l~
NO. It was rolled by rolling rolls 12 of a cold tandem rolling mill consisting of 5 stands, and No. l On the entrance side of the stand or during rolling, for example, NO. The exit side of the 4-stand roll 12 and the NO. A slitter 13 installed between the input side and the 5-stand roll 12 divides the rolled steel plate 1 into two pieces of required width, and a separator 14 installed at the exit side of the slitter 13 divides the rolled steel plate 1 into two parts. While keeping the gap g separate, the two divided steel plates 1A and 1B are placed in NO.
Parallel rolling was carried out on 5 stand rolls 12, and NO. Each steel plate 1A, 1B released from a five-stand roll 12 is wound up by a tension reel 15, respectively.

In FIG. 7, the width of the steel sheet 1 to be rolled is one that matches the maximum specification (maximum width of the sheet that can be rolled) of the rolling mill 5.

Also, the steel plates 1A and 1B are divided into two parts by the slitter 13.
The width of each board is equal, but it is divided into two or three parts with different widths, or the boards are equal! It can be divided into any number of widths, such as three.

Furthermore, by performing normal rolling for at least one bus after dividing the steel plates into the required thickness, relatively large It is possible to form etched mountains 1Aa and 1Ba (see FIG. 9). However, after slitting, it is necessary to open the slit gap g by a certain amount or more using the separator 14 before rolling.

The reason is that, as shown in Fig. 9, each divided steel plate 1A
, 1B are closely related to the elastic deformation of the rolling roll 12.
As shown in the figure, from the relationship between the slit gap g and the edge drop amount, at least the slit gap g is 20707
7! is necessary.

) As described above, when rolling a steel plate using a cold tandem rolling mill, the present invention provides a method for rolling a steel plate by rolling a sheet of steel on the inlet side of the first rolling mill or between the outlet side of the first rolling mill and the inlet side of the final rolling mill. The rolled steel plate is divided into a plurality of required plate widths using a slitter, and the slit gap is separated and held by a separator during rolling, so that nearly symmetrical edge drops are formed on both sides of each divided steel plate after rolling. It is possible,
Therefore, it is possible to manufacture a plurality of divided steel plates suitable as cold-rolled steel plates for plating while performing rolling close to the maximum specification (maximum rollable plate width) after rolling.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a cold-rolled steel plate, Figure 2 is a cross-sectional view of the cold-rolled steel plate shown in Figure 1 divided in the length direction, and Figure 3 is a galvanized steel plate of uniform thickness. FIG. 4 is an explanatory diagram showing an example of the thickness distribution of the plating layer when the steel plate of FIG. 1 is galvanized.

Claims (1)

[Claims] 1. When rolling a steel plate to be rolled using a cold tandem rolling mill, one rolled steel plate is rolled into multiple sheets by a slitter between the entry side of the first rolling mill or between the exit side of the first rolling mill and the entry side of the final rolling mill. 1. A method of cold rolling a steel plate, which comprises dividing the steel plate into required widths, and rolling the steel plate while separating and maintaining the slit gap with a separator.