JPH0526563B2 - - Google Patents

Description

[Detailed description of the invention]

(a) Industrial Application Field The present invention relates to a six-layer rolling mill for improving the shape and cross-sectional profile of rolled material. (b) Prior art Various rolls and rolling machines have been used to improve the shape (e.g., medium elongation, ear waves, fortabuckles, etc.) and cross-sectional profile (e.g., plate crown, edge drop, etc.) of rolled materials such as steel strips. have been proposed. Typical examples of these are briefly explained below. A device that moves the back-up rolls of a four-layer rolling mill in the axial direction is disclosed in Japanese Patent Application Laid-open No. 49-29263. However, this rolling mill has a complicated and large-scale equipment structure and lacks practicality.Therefore, in order to compensate for this drawback, the same applicant proposed an improved rolling mill in Japanese Patent Publication No. 195100/1983. This rolling mill inserts an intermediate roll between a work roll and a back-up roll, and moves this in the axial direction.This method is highly practical, and In addition, the present applicant has proposed a device that moves the sleeve of the back-up roll of a four-layer rolling mill in the axial direction (Japanese Patent Application Laid-open No. 103058/1982) or a workpiece mill. - Variable crown of roll or back-up roll using pressure medium (Special Publication No. 125/1983)
proposed. Other technologies used include variable speed rolling mills, roll benders, and work roll shifts. However, with the recent demand for diversification of product types, it has been recognized that the various techniques described above have limitations, particularly in shape and edge drop control.
Therefore, technologies incorporating conventional roll benders and work roll shifts were developed. For example, if a roll bender is incorporated into the above-mentioned new rolling mill, the shape control performance is considerably improved, but the edge drop control performance is still insufficient. On the other hand, if the work roll shift is incorporated, the edge drop control performance is significantly improved, but the following new problems occur, and satisfactory results cannot be obtained. That is, in the case of thin plate hot rolling, there are the following problems. B. Lack of control stability due to localized wear at the end of the roll. (b) If you try to shift the roll during rolling,
The shift drive equipment requires a large amount of power, making the equipment expensive. Due to concerns about rolling problems, low speed rolling is forced, resulting in a drop in efficiency. This occurs in any rolling process. In the case of thin plate cold rolling, there are the following problems. B Shape defects and meandering occur in the stands following the applicable stand. (b) The tapered corner of the roll end transfers marks to the rolled material. C. During rolling, rolling troubles occur due to tension fluctuations during shifting. Next, in a six-layer rolling mill, the intermediate roll and back-up roll are rolled in the same direction at the same time (but
A possible method is to move the upper roll group and the lower roll group in opposite directions. but,
In equipment with such a mechanism, it is necessary to move the heavy backup roll from side to side.
The equipment structure becomes complicated and large-scale, and it lacks practicality. In addition, if the back-up rolls are shifted from side to side, the heavy weight of the back-up rolls will be applied to only one side of the material to be rolled, so in order to control the shape of the steel plate uniformly on both sides, delicate adjustments of the left and right rolls and benders are required. It was necessary and had the disadvantage of being difficult to automate. (c) Problems to be Solved by the Invention The problems to be solved by the present invention are to significantly improve shape and edge drop control performance, which have been insufficient in the past, at low equipment costs. (D) Means for Solving the Problems The present invention provides a six-layer rolling mill with a pair of work rolls that contact the rolled material and a pair of work rolls that contact the work rolls and are movable in the axial direction. The above problem is solved by comprising an intermediate roll and a backup roll that is in contact with the intermediate roll and can move the sleeve in the axial direction. The present invention may further provide a roll bender between adjacent rolls of the rolls. Further, in the present invention, the end portion of the intermediate roll may be subjected to diameter reduction processing. (e) Example A six-layer rolling mill of the present invention will be described with reference to the drawings. First, the six-layer rolling mill shown in FIG.
It is made up of a pair of intermediate rolls 3 and a pair of backup rolls 4 that are in contact with the intermediate rolls 3 and can be moved in the axial direction. A conventional roll bender 5 may be provided between adjacent rolls of each roll 2, 3, 4. Backup roll 4 or intermediate roll 3
Alternatively, both shaft ends may be subjected to diameter reduction processing as shown in FIG. For example, a linear taper A, a curved radius B, or a combination C of a straight line and a curved line may be used. The shafts at both ends of each roll are supported by roll jocks (not shown), and each roll jocks are supported within a roll housing. Both end shafts of the back-up roll 4 and the intermediate roll 3 are connected by a conventional feeding mechanism (for example, a screw mechanism, a hydraulic cylinder,
toggle mechanism, etc.),
The intermediate roll 3 and the backup roll 4 are moved axially. On the other hand, by providing a similar jacking mechanism between the roll housing and the roll chock, it can also function as a roll bender. The six-layer rolling mill shown in FIG. 2 is almost the same as the one shown in FIG.
The difference is that only the sleeve 41 of a is configured to be movable in the axial direction. sleeve 4
The first movement method uses a hydraulic cylinder and a jack mechanism. The sleeve 41 may be engaged with the backup roll 4 using a spline key or the like, and can be easily moved using a hydraulic cylinder, jack mechanism, or the like. (F) Function In the six-layer rolling mill shown in Fig. 1, the intermediate roll 3 and the back-up roll 4 sequentially roll the rolled material 1.
Since it is shifted toward the center in the board width direction,
As shown in the diagram with an exaggerated two-dot chain line, the rolled material 1
The edge part tends to be an edge up. In addition to this roll shift, the edge up effect can be controlled more precisely by appropriately combining roll bending or roll end diameter reduction processing. In the six-layer rolling mill shown in FIG. 2, a similar effect can be obtained by moving the sleeve 41 of the back-up roll 4a in the axial direction. In the present invention, since the back-up roll itself does not move from side to side, unevenness in the shape of the rolled material from side to side due to the large weight of the back-up roll is eliminated, and automation of the left and right roll bender is extremely easy. <Specific Example 1 In a conventional cold rolling mill row consisting of five stands, the six-layer rolling mill of the present invention was applied to the first and second stands. In this case, the backup roll was made into a sleeve-movable type. Entry side rolled material dimensions: thickness 60 mm x width 1500 mm x length 50 m Output side rolled material dimensions: thickness 3 mm x width 1500 mm x intermediate coil The rolling reduction ratio was 95% and the rolling speed was 1200 m/min. The rolling results are shown in Table 1.

[Table] (G) Effects According to the 6-layer rolling mill of the present invention, the edge drop of the rolled material can be reduced to about 1/10 or less, and the shape can also be reduced to 3-3.
It can be improved by as much as 4 times.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of a six-layer rolling mill. FIG. 2 is a schematic front view of a six-layer rolling mill of the present invention. FIG. 3 is an explanatory view of the end of the roll used in the rolling mill of the present invention. FIG. 4 is an explanatory diagram showing an embodiment in which the rolling mill of the present invention is applied to a continuous rolling mill row. 1: Rolled material, 2: Work roll, 3: Intermediate roll, 4, 4a: Backup roll, 41:
sleeve.

Claims (1)

[Claims] 1. A pair of work rolls in contact with the rolled material, a pair of intermediate rolls in contact with the work rolls and movable in the axial direction, and a pair of intermediate rolls in contact with the intermediate rolls and movable in the axial direction. A six-layer rolling mill consisting of a back-up roll that can move the sleeve. 2. The six-layer rolling mill according to claim 1, wherein a roll bender is provided between adjacent rolls among the rolls. 3. The six-layer rolling mill according to claim 1, wherein the end portion of the intermediate roll is subjected to a diameter reduction process.