JP2001137929A - Method for cold-rolling metal plate with cluster mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold-rolling method of a metal plate with a cluster mill with which the composite elongation of the metal plate is eliminated and the metal plate having good shape is obtained. SOLUTION: By taking the diameters of upper and lower work rolls as <=150 mm, the tapers of the upper and lower work rolls as 1/2500-1/700 and distances from the edges of the metal plate to taper starting ends as the range of 100-350 mm, rolling is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cold rolling of a sheet material by a cluster type rolling mill using small-diameter work rolls, and more particularly to a method of eliminating a composite elongation of a sheet material and obtaining a sheet material having a good shape. The present invention relates to a method of cold rolling a sheet material using a cluster type rolling mill.

[0002]

2. Description of the Related Art When rolling a plate material having a high deformation resistance such as a stainless steel plate, a cluster type rolling mill shown in FIGS. 1 and 2 having a small-diameter work roll having a diameter of 150 mm or less is generally used. Small-diameter work rolls with a diameter of 150 mm or less have low flexural rigidity and are easy to bend. Therefore, a 12-high cluster type rolling mill (“Practical use of CR mill shape control system”, Mitsubishi Heavy Industries Technical Report, 25-4, 1988, “ Shape control characteristics of a new stainless steel rolling mill ”, Sumitomo Metals, 46-5, 1994), the work roll is high even if the shape of the plate is controlled by using shape control means such as extrusion of split backup rolls and intermediate roll benders. Next, the sheet is bent, and a composite elongation as shown in FIG. 7 occurs, and there is a problem that threading troubles such as drawing and breaking of the sheet easily occur.

In Japanese Patent Application Laid-Open No. Hei 8-90008, in the cluster type rolling mill shown in FIGS. 1 and 2, one end of the barrel of each of the upper and lower work rolls 1 and 1 is tapered so as to be tapered. The parts 1T and 1B are assembled so that they are on opposite sides of the center of the rolling mill.
A method of performing cold rolling that suppresses a shape defect by aligning the sheet with both edges of the plate material 13 is disclosed.

However, in Japanese Unexamined Patent Publication No. Hei 8-90008, the relationship between the metal flow near the end of the width of the hard rolled material and the shape of the plate is unknown. There was a problem that it could not be solved.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and it is possible to eliminate the composite elongation of the sheet material and obtain a cluster-type rolling material having a good shape. An object of the present invention is to provide a method of cold rolling a sheet material by using a machine.

[0006]

Means for Solving the Problems In a hard rolled material using a small-diameter work roll, the present inventors grasped the relationship between the metal flow near the end of the width of the hard rolled material and the shape of the plate. Completed. The present invention according to claim 1 is a cluster for rolling a plate material by incorporating upper and lower work rolls having a tapered taper on one side end into the rolling mill so that the taper is vertically opposite to each other. In the cold rolling method of a plate material in a die rolling mill, the diameter of the upper and lower work rolls is 150 mm or less, and the taper is 1/2500 to 1/70.
A cold rolling method for a plate material in a cluster-type rolling mill, wherein rolling is performed with the distance from the plate edge of the plate material to the taper cutting start end being in the range of 100 mm or more and 350 mm or less.

According to a second aspect of the present invention, there is provided a cold rolling method for a sheet material in a cluster type rolling mill, wherein a diameter of a pair of upper and lower work rolls is set to 150 mm or less, and both end portions of a barrel of the upper and lower work rolls. The taper of 1/5000 to 1/1400 is given, and the distance from the plate end of the plate material of the upper and lower work rolls to the taper cutting start end is set to a range of 100 mm or more and 350 mm or less, and rolling is performed. A cold rolling method for a sheet material in a cluster type rolling mill, wherein the method is performed.

According to a third aspect of the present invention, there is provided a cold rolling method for a sheet material in a cluster type rolling mill, wherein a diameter of a pair of upper and lower work rolls is set to 150 mm or less, and an upper work roll is selected from the upper and lower work rolls. Alternatively, a taper with a taper of 1/2500 to 1/700 is applied to both ends of one of the barrels of the lower work roll, and a taper is formed from the plate end of the plate material of the upper or lower work roll provided with the taper. A cold rolling method for a sheet material in a cluster-type rolling mill, wherein a distance to a cutting start end is in a range of 100 mm or more and 350 mm or less.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a cold rolling method according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2 are a schematic front view and a schematic side view showing a roll layout of a 12-high cluster type rolling mill. FIG. 3 is a schematic view showing the taper of a work roll used in the first embodiment.

Here, 1 is a work roll, 1T and 1B are tapered portions, 2 is an intermediate roll, 3, 4, and 5 are backup rolls, and 13 is a plate material. In addition, a is a taper cutting start end,
L is the axial length of the taper, and H is the amount of taper per radius. The taper per diameter is 2H / L. The distance from the end of the plate to the end a of taper cutting when the end a of taper cutting is moved within the plate width is EL (+).

The rolls of the 12-high cluster mill are shown in FIG.
As shown in FIG. 2, a pair of upper and lower work rolls 1, 1, two pairs of upper and lower intermediate rolls 2, 2, a pair of upper and lower small backup rolls 3, 3, an upper pair of upper backup rolls 4, It consists of two pairs of lower backup rolls 5 on the lower side. In addition, the upper backup roll 4 is divided into seven parts, and the center, quarter,
They are called quarter-out and edge, respectively, and the upper backup roll crown can be adjusted by extruding while maintaining the left-right symmetry with respect to the center of the rolling mill. The lower backup roll 5 is divided into six parts, which are called center, quarter and edge from the center, respectively. The lower backup roll crown can be adjusted by extruding while maintaining left-right symmetry with respect to the center of the rolling mill. Have been.

In the cold rolling method according to the first embodiment, the 12-high cluster type rolling mill shown in FIGS. 1 and 2 described above is tapered at one end of the peripheral surface of the upper and lower work rolls 1 and 1. The tapered portions 1T and 1B provided with the tapered portions are incorporated into a rolling mill so that the tapered portions 1T and 1B are vertically opposite to each other with respect to the center of the rolling mill. The diameter of the rolls 1 and 1 is set to 150 mm or less, and the taper 2H / L per diameter shown in FIG.
Rolling is performed with the distance EL from the end of the plate to the end a at the beginning of taper cutting in the range of 100 mm or more and 350 mm or less.

The diameter of the upper and lower work rolls 1 and 1 is 150 mm or less, the taper 2H / L per diameter is 1/2500 to 1/700, and the distance EL from the plate end to the taper cutting end a is 100.
The reason for setting the distance between mm and 350 mm will be described based on experimental results. In experiments, tapered diameters of 40-15
The work rolls 1 and 1 of 0 mm were assembled in a 12-stage cluster type rolling mill shown in FIGS. 1 and 2, and the hard material was subjected to cold rolling, and the metal flow behavior in the sheet shape and the sheet width direction of the rolled material was determined. A detailed analysis was performed on the relationship.

The relationship between the plate shape and the metal flow behavior of the plate material in the plate width direction was as follows. When the effect of the tapered work roll is insufficient and edge drop occurs in the rolled material, the material corresponding to the reduced thickness becomes a metal flow in the width direction of the thickness. Also, when the edge drop is reduced by the tapered work roll, the material having the increased plate thickness is generated by the metal flow in the plate width direction.
The metal flow in the plate width direction to increase or decrease the thickness of the plate edge occurs within a range from the plate edge to the plate edge 100 mm. Further, even if the taper is changed at the end a from the end of the plate to the end of the plate by 100 mm, the composite elongation is hardly affected.

Therefore, if the distance EL from the plate edge shown in FIG.
The composite elongation as shown in FIG. 7 cannot be suppressed.
On the other hand, when the distance EL from the plate end to the taper cutting start end a shown in FIG. 3 exceeds 350 mm from the plate end, the elongation at the center of the plate width becomes too large for the taper amount of 1/700. , Which is not preferred because it causes belly elongation.

Therefore, in the work roll used in the first embodiment, the distance EL from the end of the plate to the end a at which the taper starts to be cut is determined.
100 mm or more and 350 mm or less. In addition, taper part 1T, 1B
As shown in Fig. 4, the relationship between the taper per diameter 2H / L and the plate shape, as shown in Fig. 4, shows that when the taper exceeds 1/700, the steepness exceeds 1%, and the frequency of drawing and passing troubles increases. Becomes On the other hand, when the taper is less than 1/2500, the profile of the work roll sagging in the high order cannot be compensated, and the effect of suppressing the composite elongation becomes insufficient. Therefore, in the work roll used in the first embodiment shown in FIG. 3, the taper 2H / L of the tapered portions 1T and 1B is reduced by 1/2500.
Up to 1/700.

The reason why the diameter of the upper and lower work rolls used in the first embodiment is 150 mm or less is to reduce the rolling load. If the diameter of the upper and lower work rolls in the first embodiment is less than 40 mm, the work rolls may bend in the horizontal direction and may be in an unstable rolling state. Is preferred.

As described above, in the cold rolling method according to the first embodiment of the present invention, the diameter of the upper and lower work rolls 1 and 1 is set to 150 mm or less, and the taper per diameter 2H /
Since L is 1/2500 to 1/700 and the distance EL from the plate edge to the end a of taper cutting is 100 mm or more and 3500 mm or less, the rolling load is reduced, and an unstable rolling state may occur. In addition, the composite elongation can be eliminated and the plate shape can be improved.

Next, a cold rolling method according to a second embodiment of the present invention will be described with reference to FIG. FIG. 5A is a schematic diagram illustrating a shape of a work roll used in the second embodiment. The same components as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. In the second embodiment, the diameter of the upper and lower work rolls is set to 150 mm or less, and tapered portions 1T, 1T are formed at both end portions of the barrel of the upper work roll 1 shown in FIG. Roll 1
Tapered portions 1B, 1B are formed at both ends of the barrel.
The taper per diameter of each of the tapered portions 1T and 1T and the tapered portions 1B and 1B is 1/5000 to 1/1400. The distance from the end of the plate to the end a at which the taper starts to be cut is in a range of 100 mm or more and 350 mm or less, and is incorporated in a 12-stage cluster type rolling mill shown in FIGS. 1 and 2 for rolling.

The taper per diameter in the tapered portions 1T, 1T and 1B, 1B, 1B
The reason for setting 1/1400 is that in the drawing shown in FIG.
The sum of the taper of the upper and lower taper portions 1T and 1B on the left side and the sum of the taper of the upper and lower taper portions 1T and 1B on the right side are the taper of the left taper portion 1T and the taper of the right taper portion 1B shown in FIG. By making each the same, plate material
This is because the effect of the taper on 13 is the same as in the first embodiment, so that the composite elongation can be suppressed and the plate shape can be improved.

Rolling with the distance from the edge of the plate to the end a at the beginning of taper cutting being in the range of 100 mm or more and 350 mm or less is the same as that described in the first embodiment. . The reason why the diameter of the upper and lower work rolls used in the second embodiment is 150 mm or less is to reduce the rolling load. If the diameter of the upper and lower work rolls in the second embodiment is less than 40 mm, the work rolls may bend in the horizontal direction and may be in an unstable rolling state. Is preferred.

A cold rolling method according to a third embodiment of the present invention will be described with reference to FIG. FIG. 5B is a schematic diagram illustrating the shape of a work roll used in the third embodiment. The same components as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. In the third embodiment, the diameter of the upper and lower work rolls is set to 150 mm or less, and the tapered portions 1T and 1T at both end portions of the upper work roll 1 shown in FIG.
1 to 700, and the distance from the edge of the plate to the end a of taper cutting is set to a range of 100 mm or more and 350 mm or less.
The rolling is performed by assembling in a 12-stage cluster type rolling mill shown in FIG.

The reason why the taper of each of the tapered portions 1T and 1T shown in FIG. 5B is 1/2500 to 1/700 per diameter is that the taper of the left tapered portion 1T and the tapered portion of the right tapered portion shown in FIG. By using the same taper as 1B,
This is because the effect of the taper on 13 is the same as in the first embodiment, so that the composite elongation can be suppressed and the plate shape can be improved.

Rolling is performed with the distance from the edge of the plate to the end a at the beginning of taper cutting being not less than 100 mm and not more than 350 mm, for the same reason as described in the first embodiment, and will not be described. . The reason why the diameter of the upper and lower work rolls used in the third embodiment is set to 150 mm or less is to reduce the rolling load. If the diameter of the upper and lower work rolls in the third embodiment is less than 40 mm, the work rolls may bend in the horizontal direction and may be in an unstable rolling state. Is preferred.

In the third embodiment, the taper is applied to both end portions of the upper work roll. However, the same taper as that applied to the upper work roll is applied to both end portions of the lower work roll. Alternatively, the distance from the plate edge to the end a at the beginning of the taper cutting may be the same as that of the upper work roll, and may be incorporated in a 12-stage cluster type rolling mill and subjected to rolling.

Further, in the description of the embodiment of the present invention, a 12-high rolling mill is used, but the cluster-type rolling mill used in the cold rolling method of the present invention is not limited to 12 high rolling mills. In the cold rolling method of the present invention, a cluster type rolling mill may be used, for example, a 20-stage cluster type rolling mill.

[0027]

EXAMPLE In a 12-high cluster type rolling mill shown in FIGS. 1 and 2, a stainless steel sheet (SUS3 sheet) having a width of 1200 mm and a thickness of 1.2 mm was used.
04) was cold rolled to 0.9 mm. In addition, in the example of the invention, the upper and lower work rolls 1 and 1 each having a diameter of 90 mm are provided with a taper of 1/1000 at one end, and the tape is cut from the plate end by being incorporated into a rolling mill as shown in FIG. Rolling was performed in the same manner as in the first embodiment, with the distance EL to the beginning a being 160 mm. The rolling load is 7350kN, and the entrance and exit tensions are each
274 MPa and 314 MPa.

On the other hand, as a conventional example, a work roll having no taper was incorporated in a 12-stage cluster type rolling mill shown in FIGS. 1 and 2, and cold rolling was performed in the other manner as in the invention. FIG. 6 is a graph showing the plate shape in the invention example in comparison with the conventional example. From these results, in the invention example, the composite elongation shape can be eliminated, the steepness is as good as 0.5%, and the shape is remarkably improved. On the other hand, in the conventional example,
The rolling was extremely unstable, with the composite elongation having a steepness of about 1.8% and easy to draw.

[0029]

According to the cold rolling method of the present invention, since the composite elongation can be eliminated and a good shape can be obtained, there is no trouble such as drawing or breakage, and the excellent effect that productivity is improved. To play.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a roll layout of a cluster type rolling mill used in an embodiment of the present invention.

FIG. 2 is a side view of the cluster type rolling mill shown in FIG.

FIG. 3 is a schematic view showing a shape of a work roll used in the first embodiment of the present invention.

FIG. 4 is a graph showing the relationship between the taper and steepness of the work roll used in the first embodiment of the present invention.

FIG. 5A is a schematic diagram showing a shape of a work roll used in a second embodiment, and FIG.
It is the schematic which shows the shape of the work roll used in 3rd Embodiment.

FIG. 6 is a graph showing the plate shape of the invention example in comparison with the conventional example.

FIG. 7 is a graph showing a plate shape according to a conventional example.

[Explanation of symbols]

 Reference Signs List 1 Work roll 1T, 1B Tapered portion 2 Intermediate roll 3, 4, 5 Backup roll 13 Plate material a Taper cutting start end, L Taper axial length H Tapered amount per radius EL Distance from plate end to taper cutting start end

Continued on the front page (72) Inventor Masanori Kitahama 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Engineering Co., Ltd. (72) Inventor Shigefumi Katsura 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Inside Chiba Works (72) Inventor Yoshitake Ohiro 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Steel Corporation Chiba Works F-term (reference) 4E016 BA03 CA03 CA09 DA19 4E024 AA01 DD05 EE05

Claims (3)

[Claims] 1. A cluster type rolling mill in which upper and lower work rolls each having a tapered taper at one end are incorporated into the rolling mill so that the taper is vertically opposite to each other, and the plate material is rolled. In the cold rolling method of a plate material, the diameter of the upper and lower work rolls is 150 mm or less, and the taper is 1/2500 to 1/700, and the distance from the plate end of the plate material to the start of taper cutting is 100 mm or more, A cold rolling method for a sheet material in a cluster type rolling mill, wherein rolling is performed within a range of 350 mm or less. 2. The method according to claim 1, wherein the diameter of the pair of upper and lower work rolls is 150 mm.
mm or less, and on both ends of the barrel of the upper and lower work rolls, a taper of 1/5000 to 1/1400 is provided,
A cold rolling method for a plate material in a cluster type rolling mill, wherein a distance from a plate edge of the plate material to a taper cutting start end of the upper and lower work rolls is in a range of 100 mm or more and 350 mm or less. 3. The method of cold rolling a plate material in a cluster type rolling mill, wherein the diameter of a pair of upper and lower work rolls is 150 mm.
mm or less, and of the upper and lower work rolls, a taper of 1/2500 to 1/700 is applied to both ends of one of the barrels of the upper work roll and the lower work roll. The distance from the plate edge of the plate material of the applied upper or lower work roll to the tapered cutting start end is 100 mm.
A cold rolling method for a sheet material in a cluster-type rolling mill, wherein rolling is performed within a range of 350 mm or less.