JPH0318002Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rolling mill in which a back-up roll can be moved in the axial direction.

[Conventional technology]

As is well known, a rolling mill rolls a material by passing it between a pair of upper and lower work rolls.
The work rolls are supported by backup rolls as necessary. However, the work roll is slightly deflected during rolling due to the reaction force received from the rolled material, so there is a slight problem with the thickness accuracy in the width direction of the sheet. In order to solve this problem, for example, as seen in Japanese Utility Model Application No. 54 50027, intermediate rolls movable in the axial direction are provided between the work roll and the back-up roll, and one of the intermediate rolls is Attempts have been made to suppress deflection of the work roll and improve rolling accuracy by locating the edges of the work roll near both ends of the rolled material.

[Problem that the invention attempts to solve]

Generally, work rolls in a rolling mill are subjected to vertical loads necessary for rolling by a pair of left and right pressing mechanisms using hydraulic cylinders, screws, or the like. That is, the load in the vertical direction caused by the pressure mechanism is transmitted to the back-up roll through a chock containing a bearing, and the back-up roll presses the work roll. Therefore, when an intermediate roll is used as in the prior art described above, even if the intermediate roll is moved in the axial direction, the position of the back-up roll, that is, the position of the chock does not change, so there is not much problem.

However, in a rolling mill that does not use intermediate rolls, such as a four-high rolling mill, the back-up roll itself must be moved in the axial direction. In this case, if the back-up roll is moved in the axial direction along with the chock, the center of the load caused by the pressure mechanism and the axial center position of the chock and the bearings in the chock will not match each other, resulting in uneven wear of the bearings and rolls. Problems such as reduced life and poor rolling accuracy occur.

[Means for solving problems]

The present invention is a rolling mill equipped with a pair of upper and lower work rolls, a pair of upper and lower back up rolls that roll into contact with each work roll, and a pair of left and right pressing mechanisms that apply vertical loads to the back up rolls. applied to.

Each of the backup rolls of the rolling mill according to the present invention has a large diameter portion that contacts the work roll and a small diameter portion that is smaller in diameter than the large diameter portion. The left and right sides of each back-up roll are supported rotatably and slidably in the axial direction by a pair of front and rear rolling elements, respectively, and the upper and lower pairs of rolling elements are respectively connected to the pressure mechanism. It is arranged at a position that substantially coincides with the center of the load, and is further provided with a shift drive mechanism for moving the backup roll in the axial direction.

[Effect]

In the rolling mill with the above configuration, the rolling material is sandwiched between the upper and lower work rolls and moved in the longitudinal direction as in conventional rolling mills, while the pressing mechanism applies the necessary rolling force to the work rolls. . That is, the reaction force from the rolled material is supported by the pressing mechanism via the work roll, the back-up roll, and the rolling element.

The back-up rolls are moved in the axial direction by the shift drive mechanism so that the edges of the large diameter portions are located near both ends of the rolled material, thereby suppressing deflection of the work rolls during rolling. This improves rolling accuracy. In this case, the rolling element supporting the back-up roll and the chock supporting the rolling element do not move, and only the back-up roll moves in the axial direction, so the center of the rolling element and chock is always connected to the pressure mechanism. coincides with the center of load of Therefore, it is possible to prevent uneven wear of each part, maintain rolling accuracy, and fully demonstrate the performance of the rolling mill.

[Example] In an example shown in the drawings, a pair of upper and lower work rolls 1 and 2 have rolling parts 3 and 4 of a predetermined width,
Small diameter portions 5 located at both ends of these rolling portions 3, 4,
6 and may be similar to conventional work rolls. Rotational force is applied to the work rolls 1 and 2 by connecting joint portions 1a and 2a provided at one end thereof to a spindle on the prime mover side via a universal joint (not shown). A rolled material A having a narrower width than the rolling parts 3 and 4 is passed between the rolling parts 3 and 4. W indicates the width of the rolled material A.

Further, backup rolls 8 and 9 are provided above and below the work rolls 1 and 2. These back-up rolls 8, 9 have large diameter portions 10, 11 that contact the work rolls 1, 2, and large diameter portions 10, 1.
1. Small diameter portions 13 and 14 are provided.

And each backup roll 8, 9 has 2 left and right
One pair of rolling elements 15 and 16 at the front and rear, respectively.
is rotatably and slidably supported in the axial direction. These rolling elements 15 and 16 are
They are provided in lower chock 20, 21 and upper chock 22, 23, respectively. Each rolling element 1
5 and 16 are rotatably supported via bearings (not shown) provided in each chock. The lower chock 20, 21 is supported by the rolling mill body 25.

Further, the upper jocks 22 and 23 are adapted to be subjected to a lowering force by a pair of left and right pressure mechanisms 26 and 27. The pressure mechanisms 26 and 27 are
Screws 26a and 27a, which are held so as to be screwable in the vertical direction relative to the rolling mill stand 28, are made vertically movable by being rotated by a handle or a motor (not shown). However, if you use a hydraulic cylinder,
3 may be moved up and down.

In FIG. 1, the chock 20, 22 on the left side of the figure and the chock 21, 23 on the right side of the figure, which are paired with each other in the vertical direction, have their axial center positions located at the load centers o-o, o' of the pressure mechanisms 26, 27, respectively. It is arranged so that it almost coincides with −o′.

Further, the backup rolls 8 and 9 can be moved in the axial direction independently of each other by shift drive mechanisms 30 and 31, respectively. These drive mechanisms 30 and 31 may use hydraulic cylinders as shown in the illustrated example, but in short, any mechanism other than hydraulic cylinders may be used as long as it can move the backup rolls 8 and 9 in the axial direction. It is also possible to adopt

The rolling mill with the above configuration rotates the work rolls 1 and 2 through spindles connected to the joint parts 1a and 2a, as in the conventional rolling mill, and passes the rolled material A between the work rolls 1 and 2 to perform rolling. Let's do it. As the work rolls 1 and 2 rotate, the backup rolls 8 and 9 rotate together. Incidentally, instead of rotating the work rolls 1 and 2, the backup rolls 8 and 9 may be rotated by a spindle. In this case, the work rolls 1 and 2 rotate together.

As shown in FIG.
a and 11a are moved in the axial direction by drive mechanisms 30 and 31 so that they are located near both ends of the rolled material A. In this way, Backup Prowl 8,
By shifting 9, the deflection of the work rolls 1 and 2 during rolling is suppressed, and the thickness accuracy of the rolled material A in the width direction is improved.

As mentioned above, the axial position of the back up rolls 8 and 9 is adjusted according to the width of the rolled material A, but
In this case, the chock 20 to 23 and the rolling elements 15, 1
6 does not move in the axial direction, and only the backup rolls 8 and 9 move relatively in the axial direction. That is, no matter what position the back-up rolls 8, 9 are shifted to, the centers of the loads o-o, o'-o' caused by the pressure mechanisms 26, 27 and the centers of the rolling elements 15, 16 and the chocks 20 to 23 are the same. You can always keep them consistent.

[Effect of idea]

According to the present invention, in a four-high rolling mill equipped with a pair of work rolls and a back-up roll, by shifting the axial position of the back-up roll, the shape accuracy in the width direction of the rolled material can be improved. Even if the back-up roll is shifted, the center of the load always matches the center of the chock, bearing, etc., so the life can be extended and rolling accuracy can be improved.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a rolling mill showing an embodiment of the present invention, and FIG. 2 is a schematic side view of the rolling mill shown in FIG. 1. 1, 2... Work roll, 8, 9... Backup roll, 10, 11... Large diameter part, 13, 14
...Small diameter section, 15, 16...Roller, 20, 21
...Chiyotsuku, 22, 23...Chiyotsuku, 26,
27... Pressure mechanism, 30, 31... Drive mechanism, A
...Rolled material.

Claims (1)

[Claims for Utility Model Registration] Rolling comprising a pair of upper and lower work rolls, a pair of upper and lower back-up rolls that contact each work roll, and a pressure mechanism that applies a load in the vertical direction to the back-up rolls. In the machine, each of the above-mentioned back-up rolls has a large diameter part in contact with the above-mentioned work roll and a small-diameter part smaller than this large-diameter part, and each of the back-up rolls has two parts on the left and right, a pair of front and rear parts. The rollers are rotatably and axially slidably supported, and the upper and lower pairs of the rollers are arranged at positions that substantially coincide with the load center of the pressure mechanism, and the back-up A rolling mill characterized by being provided with a drive mechanism for moving the rolls in the axial direction.