JPH084803B2 - Rolling method for narrow material in Sendzimir mill - Google Patents

Description

The present invention relates to a method for rolling a narrow material in a Sendzimir mill.

[Prior Art] FIG. 2 is a front view showing a Sendzimir mill. In the Sendzimir mill 1, a first intermediate roll 4 and a second intermediate roll 5 are interposed between a work roll 2 and a backing bearing 3. The backing bearing 3 is divided into several pieces in the width direction of the material 6 to be rolled. The rolling pressure applied to the material 6 rolled by the Sendzimir mill 1 is transmitted to the mill housing 7 via the work roll 2, the first intermediate roll 4, the second intermediate roll 5, and the backing bearing 3.

By the way, it is extremely difficult to roll a material such as a shadow mask and a lead frame material, which is required to be thin and has a high shape accuracy, with a wide mill. Therefore, in such a case, a narrow mill having a maximum material rolling width of 600 mm is used. However, at a manufacturing plant where a wide width mill has already been introduced, it requires a large amount of equipment cost to newly introduce a narrow width mill, so it is necessary to roll a narrow material with a wide width mill. Becomes

[Problems to be Solved by the Invention] However, when rolling a material having a width narrower than the lower limit of the material rolling width of the mill specification, compared to rolling with a mill suitable for the material rolling width, the mill rigidity is smaller. As the rolling load becomes low, the plate crown fluctuates greatly due to fluctuations in the rolling load, and the plate shape lacks stability.

That is, when a wide material is rolled by a wide mill, the distribution of rolling pressure is substantially uniform in the material width direction, but when rolling a narrow material, the rolling pressure is applied only to the width center of the material. The length of the unconstrained portion corresponding to the outside of both ends of the material of the roll increases. Therefore, when the narrow material is rolled by the wide mill, the roll is easily deformed, and the plate shape is easily collapsed as described above.

An object of the present invention is to stably roll a narrow material using a wide mill.

[Means for Solving the Problems] The present invention provides a Sendzimir mill having an intermediate roll interposed between a work roll and a backing bearing.
In a method for rolling a narrow material in a Sendzimir mill that rolls a material narrower than the material rolling width lower limit value of the mill specification, in an outer portion of a portion substantially corresponding to the material both ends of the intermediate roll supported by a backing bearing, While making the diameter smaller than the inner part of the part that roughly corresponds to both ends of the material,
The large diameter portion of the intermediate roll is supported by a small diameter backing bearing, and the small diameter portion of the intermediate roll is supported by a large diameter backing bearing for rolling.

[Operation] According to the present invention, the outer diameter of the portion of the intermediate roll substantially corresponding to the both ends of the material is reduced, and the rolling reaction force of the material to be rolled is reduced in the material width direction by the large diameter portion that is not reduced in diameter. Can be received substantially evenly, and deformation of the roll can be suppressed.

Also, since the large diameter part of the intermediate roll is supported by the small diameter backing bearing, and the small diameter part of the intermediate roll is supported by the large diameter backing bearing, the rolling reaction force is received by the entire mill housing, which reduces the mill rigidity. Can be prevented.

That is, according to the present invention, when a narrow material is rolled using a wide mill, the roll deformation can be suppressed without lowering the mill rigidity, and the narrow material can be rolled stably.

[Embodiment] FIG. 1 is a front view showing a Sendzimir mill according to an embodiment of the present invention. Sendzimir mill 11 work roll 12
And a backing bearing 13 (13A, 13B, 13C, 13D), a first intermediate roll 14 and a second intermediate roll 15 are interposed. The backing bearing 13 is composed of bearings 13A to 13D divided into four in the width direction of the material 16 to be rolled. The rolling pressure acting on the material 16 rolled by the Sendzimir mill 11 is transmitted to the mill housing 17 via the work roll 12, the first intermediate roll 14, the second intermediate roll 15, and the backing bearing 13.

Here, the second intermediate roll 15 is stepped at a portion substantially corresponding to the plate width W of the material 16. That is, the Sendzimir mill 11 rolls the material 16 narrower than the material rolling width lower limit value (70% of the maximum material rolling width that can be rolled) of the mill specification, in order to roll the material 16 of the intermediate roll 15 supported by the backing bearing 13. The outer part of the part substantially corresponding to both ends of the material is made smaller in diameter 15S than the inner part of the part substantially corresponding to both ends of the material, and the inner part of the part substantially corresponding to both end parts of the material has a large diameter. Part 15L.

Further, the Sendzimir mill 11 supports the large-diameter portion 15L of the second intermediate roll 15 by the small-diameter backing bearings 13B and 13C, and supports the small-diameter portion 15S of the intermediate roll 15 by the large-diameter backing bearings 13A and 13D for rolling. .

 Next, the operation of the above embodiment will be described.

According to the above-described embodiment, the second intermediate roll 15 has a reduced diameter on the outer side of the portion substantially corresponding to both ends of the material, so that the rolling reaction force of the material 16 to be rolled is reduced by the large diameter portion which is not reduced. Rolls 12 in a substantially uniform way,
The deformation of 14 and 15 can be suppressed.

The large diameter portion 15L of the second intermediate roll 15 is supported by the small diameter backing bearings 13B and 13C,
15 small diameter part 15S is a large diameter backing bearing 13A, 13D
The rolling reaction force is supported by the mill housing 17
Therefore, it is possible to prevent the decrease in mill rigidity.

In the present invention, the diameter of the second intermediate roll 15 is reduced by only reducing the diameter of both end portions of the second intermediate roll 15.
If the small diameter portion 15S is not supported by the backing bearing 13, the constraint on the deformation of the second intermediate roll 15 is weakened, and the second intermediate roll 15 is convex downward as shown by the one-dot chain line in FIG. It becomes easy to deform.

That is, according to the above-mentioned embodiment, when the narrow material 16 is rolled by using the wide mill 11, it is possible to suppress the deformation of the rolls 12, 14, 15 without lowering the rigidity of the mill. 16 can be rolled stably.

According to the results of experiments by the present inventor, the length (the length of the stepped portion) 1 of the large diameter portion (15L) of the intermediate roll and the plate width W of the material 16 to be rolled in the present invention are 0.6. × l ≦ W ≦ l × α (1) However, it is preferable to set α ≦ 15 mm. Further, although the present invention can be applied regardless of the plate thickness, a great effect can be obtained particularly when used for a thin product having a plate thickness of 0.1 mm or less.

Hereinafter, the results of specific implementation of the present invention will be described. That is, in the case of rolling a mild steel having a plate width of 500 mm with a Sendzimir mill for material rolling having a plate width of 1000 mm, the stepped portion length 1 of the second intermediate roll 15 is 500 mm, the large diameter portion 15L and the small diameter portion 15S.
Stable rolling became possible when the level difference was set to 0.5 mm.

[Effects of the Invention] As described above, according to the present invention, when a narrow width material is rolled using a wide width mill, deformation of the roll can be suppressed without lowering the rigidity of the mill, and the narrow width material can be suppressed. Can be rolled stably.

[Brief description of drawings]

FIG. 1 is a front view showing a Sendzimir mill according to one embodiment of the present invention, FIG. 2 is a front view showing a Sendzimir mill according to a conventional example, and FIG. 3 is a front view showing essential parts of a comparative example to the present invention. . 11 …… Sendimia mill, 12 …… Work roll, 13 (13
A, 13B, 13C, 13D) …… Backing bearing, 14 ……
1st intermediate roll, 15 ... 2nd intermediate roll, 15L ... large diameter part, 15S ... small diameter part, 16 ... material to be rolled.

Claims (1)

[Claims] 1. A Sendzimir mill comprising an intermediate roll interposed between a work roll and a backing bearing,
In a method for rolling a narrow material in a Sendzimir mill that rolls a material narrower than the material rolling width lower limit value of the mill specification, in an outer portion of a portion substantially corresponding to the material both ends of the intermediate roll supported by a backing bearing, While making the diameter smaller than the inner part of the part that roughly corresponds to both ends of the material,
A method for rolling a narrow material in a Sendzimir mill, characterized in that the large diameter portion of the intermediate roll is supported by a small diameter backing bearing and the small diameter portion of the intermediate roll is supported by a large diameter backing bearing for rolling.