JPS6365404B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for shifting work rolls in a rolling mill for ferrous and non-ferrous metals.

In conventional general rolling mills, the work rolls usually do not shift in the roll axis direction. As a result, when rolling plates of the same width are successively rolled, the first
As shown in the figure, the work roll a is worn by the width of the rolled plate b, resulting in a stepped portion c. Therefore, if a wide rolled plate b' is to be rolled subsequently, the stepped portion c will cause the rolled plate to be rolled as shown by the imaginary line.
Non-uniformity in thickness will occur in plate b', and therefore, it is necessary to newly replace work roll a each time a wide rolled plate b' is rolled, resulting in frequent operations and suspension of rolling work in between. There are also problems that lead to new adjustment work and the occurrence of defective products as a result. Therefore, as shown in Fig. 2, the work rolls 1 and 2 are shifted in the axial direction and the rolling plate 3 is
It is possible to average out the amount of wear in the longitudinal direction of the work rolls 1 and 2 by changing the rolling position of the work rolls 1 and 2, but simply shifting the work rolls 1 and 2 in the rolling state requires a very large force. This necessitates a strong shift device, and there is a problem in that the forced sideways sliding causes sliding scratches on the rolling plate 3 and the work rolls 1 and 2.

The present invention was made in view of these problems.
When shifting the rolls of a rolling mill, a thrust force is generated on the roll by tilting the roll in a plane parallel to the rolling surface of the rolling plate, and the thrust force is used to shift the roll in the axial direction. The present invention relates to a roll shifting method for a rolling mill and an apparatus therefor.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 3 shows the basic concept of the present invention.
As shown in the figure, when shifting the upper work roll 1 to the left and the lower work roll 2 to the right, the work rolls should be moved so that the ends of the work rolls 1 and 2 in the shifting direction are downstream of the rolling line L of the rolling plate 3. 1,2
is momentarily tilted, and the thrust force generated thereby is used to shift work rolls 1 and 2, and immediately after the shift, work rolls 1 and 2 are moved perpendicular to the original rolling line L. Try to get it back to normal.

Figures 4 to 6 show an example of a rolling mill equipped with a double chock type work roll bending device to which the present invention is applied. Axle boxes 4, 5, 6, and 7 are fixed, and outer axle boxes 9, 10 for roll bending are attached to the outside thereof.
11 and 12 are provided. That is, as shown in FIG. 6, the shaft portions of the upper and lower work rolls 1 and 2 have a two-stage structure of an inner shaft portion 13 and an outer shaft portion 14, and the inner shaft portion 13 has inner shaft boxes 4, 5, 6, 7. is mounted through a bearing 15 with its movement in the axial direction restrained by a nut 16, a bearing positioning collar 17, etc., and the outer shaft portion 1
4 has outer axle boxes 9, 10, 11, 12 and bearings 18.
The shaft can be freely slid in the axial direction. Each of the inner axle boxes 4, 5, 6, and 7 has an extension beam 1 extending outwardly through the front and rear sides of the outer axle boxes 9, 10, 11, and 12 in the rolling line L direction.
9, 20, 21, 22 are fixed thereto, and an engaging collar 23 is formed at each outer end of the extension beams 19, 20, 21, 22. In the above, by pushing and pulling the extension beams 19, 20, 21, 22, the upper and lower work rolls 1, 2 are supported by the inner axle boxes 4, 5, 6, 7, and the outer axle boxes 9, 10, 11, 12 in the axial direction. Further, the housing 8 is provided with a bending hydraulic piston 26 for applying work roll bending pressure to the outer shaft boxes 9, 10, 11, and 12 using pressure oil supplied from a pressure setting valve 24 through a hydraulic piping 25. It is being 27, 28 in the figure
29 indicates a back-up roll shaft box, and 30 indicates a lowering block.

7 to 10 show the upper and lower work rolls 1,
This figure shows the configuration for performing the tilting and shifting of step 2, and the roll change side (right side) of upper work roll 1.
will be explained in detail using an example.

A wedge-shaped space is formed on the front and rear inner surfaces in the rolling line L direction of the housing 8 that supports the inner axle box 4 and the outer axle box 9, and wedge liners 31 and 32 having a shape that matches the wedge-shaped space are attached to the housing 8.
The cylinders 35 and 36 for the Uji liner are fixed to the roll adjusting device frames 33 and 34 provided on the outside of the cylinder 35 and 36 so that the cylinders 35 and 36 can be inserted and pulled out.

Each of the roll adjustment device frames 33 and 34 has a handle 3 parallel to the axis of the work roll 1.
Screw rods 41, 42 are provided which are rotated simultaneously via gears 39, 40 by the rotation of the screw rods 7, 38, and are further shifted along the roll adjusting device frames 33, 34 by the rotation of the screw rods 41, 42, and Engagement collar 23 of extension beams 19, 19
Shift frames 43 and 44 are provided to engage with. Further, each of the shift frames 43 and 44 is provided with a tilting block 45 and 46 which can be slid in the direction of the rolling line L by, for example, a dovetail groove, and the tilting blocks 45 and 46 are connected to the positioning devices 47 and 48 via a hydraulic pipe 49. Tilting cylinders 50 and 51 are provided which are moved forward and backward by pressure oil supplied by the cylinders.
5 and 46, the engaging collars 23 of the extension beams 19 and 19 are pressed in the direction of the rolling line L, so that the work roll 1 can be tilted in a plane parallel to the rolling surface of the rolling plate 3.

In the figure, reference numerals 52 and 53 indicate shift motors provided on the screw rod 41 in order to automatically shift the handles 37 and 38, and in this case, the positioning device 47 , 48 and shift motor 52,
An operation command device 56 that performs interlock control of 53 is provided.

In order to shift the work rolls 1 and 2 in the above configuration, first, as shown in FIG. By forming a gap X between the front and rear side surfaces of the axle box 4 and the outer axle box 9 and the housing 8, and then pushing out one of the tilting blocks 45, 46 and retracting the other by operating the tilting cylinders 50, 51. The work roll 1 is tilted via the extension beam 19. At this time, as shown in FIG. 10, the end sides A' and B' of the directions A and B in which the upper and lower work rolls 1 and 2 are shifted are on the rolling line L.
Each extension beam 19, 2
The upper and lower work rolls 1 and 2 are tilted by applying pressures of 0, 21, and 22. During the above tilting, the roll driving side (left side) opposite to the roll changing side can also be operated as shown in FIG. 10 by the same device as the roll changing side. In addition, on the roll drive side, the axle box is connected to the housing 8 via a cylindrical liner that allows inclination in a plane parallel to the rolling surface.
It may also be supported by In this case, the intersecting angle of the upper and lower work rolls 1 and 2 is set by the device on the roll changing side, but the intersecting point is at a certain predetermined position. However, this method may be used to achieve the purpose of the present invention.

Immediately after the above tilting is performed, the handle 37,
By rotating 38, the screw rods 41 and 42, the shift frames 43 and 44, and the engaging collar 2
3 to shift the work rolls 1 and 2 in the A and B directions. At this time, the shift frames 43 and 44 on the extension beams 19 and 22 side rotate the handles 37 and 38 in a direction that pushes out the extension beams 19 and 22. At this time, the work rolls 1 and 2 are tilted as described above, so that the work rolls 1 and 2 are tilted.
Since a thrust force is generated to move the work rolls 1 and 2 in directions A and B, the work rolls 1 and 2 can be easily shifted by simply rotating the handles 37 and 38 with a small force.

Immediately after the shift is completed, tilt cylinder 5
0 and 51 in the opposite direction to the above-mentioned direction to return the work rolls 1 and 2 to the original state perpendicular to the rolling line L, and then drive the wedge liner cylinders 35 and 36.
is driven to push the wedge liners 31, 32 into the wedge-shaped space, thereby restraining the movement of each axle box 4, 5, 6, 7, 9, 10, 11, 12 of the work rolls 1, 2.

As described above, since the work rolls 1 and 2 are shifted using the thrust force generated by tilting the work rolls 1 and 2, the work rolls 1 and 2 and the rolling plate 3 are
By performing the above-mentioned shifting, the work rolls 1 and 2 are free from slipping and scratches.
Since the amount of wear in the longitudinal direction can be averaged, rolled plates with different widths can be rolled with the same work rolls 1 and 2, which significantly reduces the frequency of roll replacement and greatly improves rolling work efficiency. You can improve your performance. Note that the roll profile of the work rolls 1 and 2 changes due to the shift, but this change is corrected by adjusting the amount of bending by the bending hydraulic pistons 26 provided in the outer axle boxes 9, 10, 11, and 12. . When the work rolls 1 and 2 are taken out of the housing 8 for rearrangement, a tilting block opening command 54 is given to the operation command device 56 and the positioning devices 47 and 48 are
The work rolls 1, 2 can be taken out by contracting the tilting cylinders 50, 51 via the tilting cylinders 50, 51 and disengaging the tilting blocks 45, 46 from the engaging collars 23.

Further, the interlocking control command 5 is sent to the operation command device 56.
5, the positioning devices 47, 48
By interlockingly controlling the shift motors 52 and 53, it is possible to automatically tilt and shift the work rolls 1 and 2.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but as shown in FIG. It can also be locally controlled at the end, Backup Roll 2
It goes without saying that a thrust force can be applied to the work rolls 1 and 2 by tilting the work rolls 7 and 28, and that various other changes can be made without departing from the gist of the present invention.

According to the above-described rolling mill roll shifting method and device of the present invention, the following excellent effects can be achieved.

(i) When shifting the rolls of a rolling mill, a thrust force is generated on the rolls by tilting the rolls in a plane parallel to the rolling surface of the rolling mill, and the thrust force is used to shift the rolls in the axial direction. Therefore, it is possible to shift with an extremely small shift driving force.

(ii) During roll shifting, no forcible side slipping occurs between the rolling plate and the rolls, so there is no possibility of slipping scratches on the rolling plates or rolls.

(iii) Since wear in the axial direction of the rolls can be made uniform by roll shifting, a wide plate can be rolled after a narrow plate, which can extend the usage time of the rolls and reduce the frequency of roll replacement. Therefore, rolling efficiency can be significantly improved.

(iv) By increasing the length of the arm for roll bending, roll bending can be performed more effectively.

(v) By giving the roll a special crown shape, it is possible to provide a special sheet thickness distribution at the sheet width ends.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the wear state of a roll without conventional roll shifting, Fig. 2 is an explanatory diagram showing the shift direction of the work roll, and Fig. 3 is a plane view of the work roll showing the basic concept of the present invention. Figure 4 is a front view showing an example of a double chock type rolling mill to which the present invention is applied, Figure 5 is a side view of Figure 4, and Figure 6 is a side view of Figure 4.
The figure is an enlarged sectional view showing the structure of the double choke part.
FIG. 7 is an explanatory diagram showing a configuration example of the present invention for tilting and shifting a work roll, FIG. 8 is a partially enlarged perspective view of FIG. 7, and FIG. 9 is a plan view showing the operation of the device for tilting a work roll. FIG. 10 is a plan view showing the direction of inclination of the work roll, and FIG. 11 is a diagram showing an example in which a tapered portion is formed on the work roll. 1 is the upper work roll, 2 is the lower work roll, 3
is a rolled plate, 4, 5, 6, 7 are inner axle boxes, 8 is a housing, 9, 10, 11, 12 are outer axle boxes, 1
9, 20, 21, 22 are extension beams, 23 is an engaging collar, 26 is a bending hydraulic piston, 27 is an upper back up roll, 28 is a lower back up roll, 31, 32 are wedge liners, 35, 36
is the wedge liner cylinder, 37 and 38 are handles, 41 and 42 are screw rods, and 43 and 4 are
4 is a shift frame, 45 and 46 are tilting blocks, 5
0 and 51 are tilting cylinders, 52 and 53 are shift motors, and 56 is an operation command device.

Claims (1)

[Claims] 1. When shifting the rolls of a rolling mill, a thrust force is generated on the rolls by inclining the rolls in a plane parallel to the rolling surface of the rolled plate during rolling, and the thrust force is utilized. A method for shifting rolls in a rolling mill, which comprises shifting the rolls in the axial direction and then restoring the tilted rolls to their original inclinations. 2. A space is formed between the front and rear sides of the rolling line in the roll axle box and the housing, and a liner that fits into the space and a device for taking the liner in and out of the space are provided, and an extension beam is provided in the roll axle box. , a device for pushing and pulling the extension beam in the direction of the rolling line to tilt the roll in a plane parallel to the rolling surface of the rolling plate and returning it from the tilted state; A roll shift device for a rolling mill, comprising a device for shifting rolls in the axial direction. 3. A space is formed between the front and rear sides of the rolling line in the roll axle box and the housing, and a liner that fits into the space and a device for taking the liner in and out of the space are provided, and an extension beam is provided in the roll axle box. , a device for pushing and pulling the extension beam in the direction of the rolling line to tilt the roll in a plane parallel to the rolling surface of the rolling plate and returning it from the tilted state; A roll shift device for a rolling mill, comprising a device for shifting a roll in an axial direction, and an operation command device for interlocking and controlling the operations of a device for tilting the roll and a device for shifting the roll.