JP3807187B2 - Temper rolling method and temper rolling equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a temper rolling method and temper rolling equipment for cold rolled steel sheets, and more particularly to a temper rolling method and temper rolling equipment capable of preventing the occurrence of a cross buckle found in a cold rolled steel sheet having a thin plate thickness. .
[0002]
[Prior art]
In general, when a cold-rolled steel sheet is temper-rolled, shape defects such as vertical bars, bellows, or cross buckles in which these appear in combination are likely to occur. This cross buckle is described as being caused by restraint and release of stress generated in the steel strip during temper rolling. And for the prevention measures, for example, as proposed in Japanese Patent Laid-Open No. 4-19553 or Japanese Patent Laid-Open No. 11-57804, a bender roll or an auxiliary roll provided on the exit side of the temper rolling mill is used. There is known a method of increasing the outflow angle from a steel strip temper rolling machine by extruding from a steel strip pass line.
[0003]
[Problems to be solved by the invention]
In order to achieve the above-mentioned purpose, it is necessary to provide the bender roll or the auxiliary roll with a considerably large moving distance. However, on the exit side of the temper rolling mill, equipment for maintaining the shape of the steel strip, such as a tension roller, is disposed in a limited space, so that the auxiliary roll can be moved sufficiently. In some cases, the distance cannot be given, and it is difficult to ensure a sufficient outflow angle. An object of the present invention is to provide a temper rolling method and a temper rolling facility capable of preventing the occurrence of a cross buckle even when it is difficult to ensure such an outflow angle.
[0004]
[Means for Solving the Problems]
The present inventor has repeatedly studied the prevention measures for the cross buckle and discovered that the cross buckle can be eliminated regardless of the outflow angle if the distance between the contact points of the work strip and the auxiliary roll of the steel strip is made sufficiently small. Completed the invention. Specifically, in the temper rolling method of the cold-rolled steel strip of the present invention, the auxiliary roll provided on the exit side of the work roll of the temper rolling mill is pushed up or pushed down from the pass line, to the work roll of the steel strip. The rolling angle of the steel strip is limited to 8 ° or less, and the distance between the contacts with the work roll and auxiliary roll of the steel strip is 100 mm or less, and the temper rolling of the cold-rolled steel strip of the present invention The equipment shall push the steel strip up or down from the pass line to the exit side of the temper rolling mill, and when the wrapping angle of the steel strip to the work roll is 8 ° or less, the contact between the steel strip work roll and the auxiliary roll An auxiliary roll is installed to bring the distance close to 100 mm or less.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be specifically described based on examples. FIG. 1 shows an equipment row configuration of a typical temper rolling facility. As shown here, the steel strip S is rolled by a temper rolling mill 1 by a predetermined rolling reduction, and then the first auxiliary It is conveyed to the tension roller 5 through the roll 3 and the second auxiliary roll 7. In the present invention, the cylinder 4 is attached to the first auxiliary roll 3 adjacent to the temper rolling mill in the temper rolling equipment, and the first auxiliary roll 3 is connected to the original pass line of the steel strip S as indicated by a broken line. It has a structure that moves it upwards.
[0006]
When the cylinder 4 is operated in this structure and the first auxiliary roll is pushed up from the regular pass line, the steel strip pass line bends toward the upper work roll 2A as shown by the broken line in FIG. The distance between the contact end point P of the steel strip with the work roll and the contact start point Q of the auxiliary roll is shortened. In the present invention, the distance l between the PQs is as short as 100 mm or less.
[0007]
The means for that is not particularly questioned, but for example, as shown in FIG. 1, the push-up direction of the first auxiliary roll 3 can be an obliquely upward direction toward the work roll 2A. In addition, as shown in FIG. 2, the distance m between the work roll 2A and the auxiliary roll 3 may be as small as, for example, about 150 mm, and the auxiliary roll may be pushed up by the cylinder 4 in the vertical direction. In this case, it is convenient for the auxiliary roll 3 to have a relatively small diameter, for example, 100 to 150 mm, in order to approach the work roll 2A.
[0008]
In any case, if the distance between the contact points of the steel strip work roll and the auxiliary roll is 100 mm or less, the object is achieved. Fig. 3 shows the wrapping angle (outflow angle) of the steel strip to the work roll 2A as 2-4 °, 4-8 °, 8 ° or more, and the distance between the contact points of the steel strip work roll and the auxiliary roll. It is the result of having investigated the generation | occurrence | production ratio of the cross buckle of the steel strip in the case of changing. As shown here, when the distance between the contacts is 100 mm or less, the occurrence of a cross buckle can be prevented regardless of the winding angle.
[0009]
In the above example, the moving direction of the auxiliary roll 3 is set close to the upper work roll, but the auxiliary roll 3 is arranged on the upper side of the pass line, and the moving direction is set close to the work roll 2B, that is, It's also good to push down.
[0010]
As mentioned above, although this invention was demonstrated based on the Example, embodiment of this invention is not restricted to the said example, A various form can be taken unless it deviates from the technical idea. For example, the cold-rolled steel sheet that can be manufactured by applying the present invention includes a stainless steel cold-rolled steel sheet in addition to a general low-carbon high-cold-rolled steel sheet, and a range in which a cross buckle occurs in the thickness. Can be applied. For example, it can be applied to the production of a stainless steel foil of 100 μm or less. Furthermore, the temper rolling mill can be applied not only to a normal four-stage temper rolling mill but also to a two-stage or six-stage temper rolling mill.
[0011]
【The invention's effect】
Since the present invention is configured as described above, even if it is difficult to ensure a sufficient outflow angle in the limited space on the exit side of the temper rolling mill, the occurrence of cross buckles is almost completely prevented. sell.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing the overall configuration of a temper rolling facility according to the present invention.
FIG. 2 is an explanatory view showing the state of conveyance of the steel strip in the present invention. FIG. 3 is a diagram showing the relationship between the distance between the contact points of the work strip and auxiliary roll of the steel strip and the occurrence rate of the crossback ring of the steel strip. is there.
[Explanation of symbols]
1: Temper rolling mill
2: Work roll
3: First auxiliary roll
4: Cylinder
5: Tension roller
6: Backup roll
7: Second auxiliary roll
S: Steel strip θ: Winding angle (flow angle)
l: Distance between contact points of steel strip with work roll and auxiliary roll
m: Distance between work roll and auxiliary roll

Claims (2)

The auxiliary roll provided on the exit side of the work roll of the temper rolling mill is pushed up or down from the pass line to limit the winding angle of the steel band to the work roll to 8 ° or less, A temper rolling method for cold-rolled steel strips, wherein rolling is performed with a distance between contacts with the auxiliary roll being 100 mm or less. The steel strip is pushed up or down from the pass line to the exit side of the temper rolling mill, and when the winding angle of the steel strip on the work roll is 8 ° or less, the distance between the contact points of the steel strip with the work roll and the auxiliary roll is 100 mm. A temper rolling facility for cold-rolled steel strip, characterized in that an auxiliary roll is provided close to the following.

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