JPS6356001B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for skin-pass rolling a steel strip or the like using a multi-stage cluster rolling mill that performs cold rolling.

The main purpose of temper rolling is to prevent stretcher strain in the case of plates with yield phenomena such as mild steel plates and ferritic stainless steel plates, and it also improves gloss and flatness even in the case of plates without yield phenomena such as austenitic stainless steel plates. , which performs light reduction rolling within a few percent for the purpose of improving plate thickness accuracy.
This is usually carried out using a double or quadruple rolling mill with relatively large diameter work rolls.

By the way, when a four-layer rolling mill is used as a cold rolling mill, it is easy to perform skin pass rolling using this mill. However, when dealing with hard materials such as stainless steel, a multi-stage cluster rolling mill with small diameter work rolls is generally used because the rolling capacity is insufficient for cold rolling with a four-layer rolling mill. As a method for skin pass rolling using a multi-high cluster rolling mill, the work rolls of a 20-high rolling mill,
JP-A-52-73158 discloses a method of removing the first intermediate roll and the non-driven second intermediate roll and incorporating a large-diameter work roll into the rolling mill. However, since the multistage cluster rolling mill is designed for high pressure rolling, it cannot be used for temper rolling simply by increasing the diameter of the work rolls.
First, there is a problem in that the rolling force control error due to the rolling mechanism designed for high reduction rolling is too large compared to the required rolling force for light reduction rolling, making it difficult to adjust the rolling force. This problem was solved by modifying the lowering mechanism such as the hydraulic cylinder and hydraulic circuit. (Japanese Patent Application No. 55-180506) Next, even if it is possible to adjust the lowering force lightly in the lowering mechanism,
There is a problem in that the necessary rolling force is difficult to be transmitted to the rolled material.

In other words, in an example where a large-diameter work roll is installed in a multi-stage cluster rolling mill, as shown in FIG. drive rolls) 2a, 2b and 2c, 2d,
4 back up rolls 3a, 3 on top and bottom
It has a structure in which the rolling force from the upper and lower hydraulic cylinders 5T and 5B is transmitted via the upper and lower hydraulic cylinders 5T and 5B via the rollers b, 3c, 3d and 3e, 3f, 3g, and 3h, and the driven rolls 2a, 2b, 2c, and 2d are driven by a drive mechanism (not shown). The work rolls 1a and 1b are rotated by the friction between each intermediate roll and the work roll.

When temper rolling is performed using a multi-stage cluster rolling mill configured in this way, even if the required rolling force is set at the start of rolling and a rolling force is applied to the hydraulic cylinder 5T, roll bite occurs between the work rolls 1a and 1b. There is a problem in that only a part of the pressure force of the hydraulic cylinder 5T is transmitted. For example, when a large-diameter work roll 1a is installed as shown in Fig. 1, the driven rolls 2a and 2b are connected to the drive mechanism so that they rotate in the same direction, so the rolling force applied to the rolling mechanism is is restrained by the driven rolls 2a and 2b, becomes a frictional force between the rolls, and is not properly transmitted to the roll bite. However, since the frictional force is suddenly released at the same time as rolling starts, the rolling force increases rapidly. In such cases, the rolled material may become compressed or break. Even in mild cases, it becomes impossible to adjust the rolling force.

The reason why the rolling force is not transmitted properly is that the two driven rolls, upper and lower, which are in contact with the work roll, are connected to the drive mechanism so that they are both rotationally driven. Therefore, one of the two driven rolls may be disconnected so that only one of the two driven rolls is rotationally driven, or both may be made non-driven.

The present invention is characterized in that both cold rolling and skin pass rolling can be achieved by providing a drive switching means that can connect and disconnect the drive to the drive transmission mechanism of a multi-stage cluster rolling mill.

The apparatus of the present invention will be explained below with reference to embodiments shown in the drawings. Figure 2 shows a drive transmission mechanism for driven rolls.
For example, 12 is a drive spindle for transmitting the output of an electric motor (not shown) to the driven roll 2 via a power distributor 11, and shaft couplings 13 and 14 are provided on both sides of the spindle by a spline structure. Thrust buttons 15 and 16 fitted together and attached to both ends are in contact with the driven roll 2 and the output shaft 17, respectively, and the output shaft 17 and the shaft coupling 14 are connected by a gear coupling mechanism. . On the other hand, the shaft coupling 13 and the driven roll 2 are connected by a chrysanthemum-shaped coupling as shown in FIG. 4, and the joints between the driving spindle 12, the driven roll 2, and the output shaft 17 are configured to be bendable. Reference numeral 18 denotes a roll chock with a built-in bearing, which supports the axial position of the driven roll 2 by closing the mill door 19. A spring 20 is passed between the roll chock 18 and the housing 6, and supports the upper driven roll 2 in the radial direction.

Note that the lower driven rolls 2c and 2d in FIG. 1 are supported by backup roll groups 3e to 3h. With such a drive transmission mechanism, the first
Each of driven rolls 2a and 2b, 2c and 2d in the figure
The book is connected to the power distributor 11 in FIG. 2,
Each driven roll 2 is configured to be integrally driven by a power distributor 11. Reference numeral 21 denotes a support device for the drive spindle 12 consisting of a cylinder 22 and a holder 23, which is fixed to a frame 24, and holds the spindle and the drive side of the driven roll 2 during rolling suspension through the shaft coupling 13. During rolling, the cylinder 22 is lowered to provide a gap between the spindle 12 and the holder 23 so that they do not come into contact with each other.

Although there is a method of removing the spindle 12 as a non-driving roll means, it takes a long time to reassemble, which is not desirable from a business perspective. Furthermore, when the roll gap is open, the upper non-driven roll needs to be pulled upward, but a means for doing so needs to be installed separately. When a dual-purpose mill is used, the recombination time becomes longer, which is not preferable. Therefore, for dual-purpose milling, a device that holds the non-driven roll 2 is required.

FIG. 6 shows an example of the drive switching means of the present invention,
25 is a non-driven roll, and a self-aligning roller bearing 26 is fitted on the thrust button 15 side of the roll shaft 25a, and the shaft 25a is in contact with the thrust button 15. Reference numeral 27 denotes a shaft joint provided with a charging part 28 for a self-aligning roller bearing 26; the self-aligning roller bearing 26 is inserted into the charging part 28; Therefore, it is fixed to the shaft joint 27. 30 indicates the seal of the self-aligning roller bearing 26. Note that the shaft coupling 27 and the drive spindle 12
The joint has the same spline structure as in Fig. 2.

Next, the operation of the present invention will be explained. When performing normal cold rolling that requires a high rolling reduction rate, as shown in FIG.
b, two upper and lower first intermediate rolls 31a, 31;
b, 31c, 31d, one each for upper and lower non-driven second
Intermediate rolls 32a and 32b are inserted to constitute a well-known 20-high Sendzimir rolling mill. Next, as in a normal rolling operation, rolling is performed by driving two driven rolls, each upper and lower, by the drive transmission mechanism shown in FIG. That is, for each driven roll, as shown in FIG.
7, shaft coupling 14, drive spindle 12, shaft coupling 1
3, the driven roll 2 is driven to perform high pressure rolling.

Next, when performing light reduction (low reduction) rolling such as temper rolling, two upper and two lower driven rolls 2a, 2
One or both of the upper and lower driven rolls of rolls b, 2c, and 2d are rearranged to be non-driven as shown in FIG. When changing the rolls, the cylinder 22 is moved upward, and the drive spindle 12 is suspended and supported by the holder 23.

Next, open the mill door 19, disconnect the spring 20 from the roll chock 18, pull out the driven roll 2 toward the mill door 19, disconnect it from the shaft coupling 13, and move the driven roll 2 to the housing 7.
Take it out. Next, the thrust button 15 is removed and the shaft coupling 1 is removed from the drive spindle 12 and taken out to the mill door 12 side.

Next, in order to mount the non-drive roll 25 as shown in FIG.
7 to the drive spindle 12, the shaft connection device 2
7 and the thrust button 15 on the drive spindle 12
Insert. Next, the bearing 26, the fixture 2
9. Load the non-driving roll 25 with the seal 30 attached to the roll shaft 25a, load the bearing 26 into the loading portion 28 of the shaft connection device 27, and fix it with the fixing fitting 29.

After the non-driving roll 25 is mounted, the non-driving roll 25 is suspended and fixed by the spring 20, contrary to the above, and the cylinder 22 is actuated downward to release the support of the driving spindle.

In this way, one or both of the two driven rolls on the upper or lower side of FIG. 1 are rearranged to become non-driven rolls. Next, by driving an electric motor (not shown), one of the upper and lower driven rolls is driven, or temper rolling is performed without driving both.

7 and 8 show other examples of the drive switching means, in which a spherical protrusion 32 provided on the shaft of the non-drive roll 25 is inserted into the shaft joint 31 and brought into contact with the thrust button 15. In FIG. 8, a thrust button 34 is provided on the shaft of the non-driving roll 25, and the thrust button is brought into contact with the shaft coupling 33. The non-driven roll is configured to be able to support the non-driven roll in the horizontal direction without being transmitted to the driver.

The method of the present invention is not limited to the case where a large-diameter work roll based on the above-mentioned cluster rolling mill is incorporated, but is applicable to various multi-stage cluster rolling mills. An example of application is illustrated in FIG. FIG. 9A shows the roll arrangement when cold rolling is performed, and FIG. 9B shows the roll arrangement when adjusting rolling is performed, in which a drive switching means is provided for the drive transmission mechanism of the rolls marked with an x.

The device of the present invention makes it possible to stably and accurately perform temper rolling from the start of rolling using a multi-stage cluster rolling mill that has conventionally been used exclusively for cold rolling. By adopting this method, it became possible for the first time to use a multi-high cluster rolling mill as a rolling mill for both cold rolling and tempering.

[Brief explanation of drawings]

Fig. 1 shows an example of a multi-stage cluster rolling mill to which the device of the present invention is applied, Figs. 2 to 9 show examples of the device of the present invention, and Fig. 2 shows a drive transmission mechanism for driven rolls. FIG. 3 is a diagram showing a 20-stage Sendzimir mill to which the present invention is applied, FIGS. 4 and 5 are partial sectional views of FIG. 2, FIG. 6 is a diagram with drive switching means, and FIG. FIG. 8 is a diagram showing another example of the drive switching means, and FIG. 9 is a diagram showing another example of a multi-stage cluster rolling mill to which the apparatus of the present invention is applied. 1... Work roll, 2... Driven intermediate roll,
3...Backup roll, 5...Hydraulic cylinder, 6...Housing, 11...Power distributor, 1
2... Spindle, 13, 14... Shaft coupling, 1
5, 16... Thrust button, 17... Output shaft,
18...Rollchotsk, 19...Mildoor,
20... Spring, 21... Support device, 25...
...Non-driven roll, 26...Roller bearing.

Claims (1)

[Claims] 1. In a multi-stage cluster rolling mill in which drive is transmitted between two driven rolls, one each on the upper and lower work rolls, a drive transmission mechanism for one or both of the two driven rolls. A dual-purpose multi-stage cluster rolling mill characterized by being equipped with drive switching means.