JPH06242B2 - Rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention can reduce edge drops at both ends of a rolled material and can easily roll a difficult-to-machine material such as high-strength steel. Moreover, the present invention relates to a rolling mill in which the number of passes is reduced and the work rolls can be easily replaced.

[Prior Art] For example, in a conventional four-high rolling mill, a pair of upper and lower work rolls that cannot shift in the axial direction are driven by a drive device, respectively, and a rolling load is applied to the work rolls via a retaining roll. The rolled material is rolled by the upper and lower work rolls.

[Problems to be Solved by the Invention] However, the above-described conventional rolling mill has the following drawbacks.

(i) Since the work roll must be driven to transmit the maximum torque required for the rolling schedule, the diameter must be increased, and if the diameter is increased, the rolling load must be increased in order to obtain the prescribed rolling reduction. Must. However, when the rolling load is large, the rolls are flat, so that the rolling pressure becomes large and the rolling reduction cannot be made large, the number of passes of the rolled material increases, and the production efficiency becomes poor.

(ii) Further, when the work roll has a large diameter, it is difficult to roll the hard work-resistant material such as high-strength steel due to the above reason.

(iii) When exchanging the work rolls, the rolling line must be stopped, so that the exchanging work takes time and the production efficiency is poor.

(iv) Since the rolled material has an edge drop at the width end, the cross-sectional shape of the rolled material is not good and the product quality is not good.

In view of such an actual situation, the present invention aims to reduce the number of passes of rolled material, facilitates rolling of difficult-to-machine materials, and enables easy switching of work rolls in-line, and further the cross section of rolled material. The purpose is to improve the shape.

[Means for Solving the Problems] The present invention is rotatably attached to the shaft portion of at least one large-diameter work roll of a pair of upper and lower large-diameter work rolls that can be mutually shifted in the axial direction. A small-diameter work roll fitted with a rotary-shaft box and capable of approaching and separating from the center of the large-diameter work roll on which the rotary-shaft box is attached and arranged parallel to the large-diameter work roll. A small-diameter work roll shaft box that rotatably supports is fitted, and a fluid pressure cylinder for imparting roll balance or roll bending to the small-diameter work roll is interposed between the small diameter work roll shaft box and the rotary shaft box. It is a thing.

[Operation] Therefore, in the present invention, the work roll having a small diameter and the work roll having a large diameter are switched according to the plate to be rolled, and the work roll is shifted in the axial direction according to the plate width to perform rolling. When a work roll having a small diameter is used, roll bending can be applied to the work roll having a small diameter.

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

1 to 7 show an embodiment of the present invention.

In FIG. 1, 1 is a small-diameter work roll, 2 and 3 are large-diameter work rolls, 4 and 5 are retaining rolls, and large-diameter work rolls 2 and 3
Can be driven by electric motors 6 and 7.
The small-diameter work roll 1 revolves around the large-diameter work roll 2 around the rotation center of the large-diameter work roll 2 so that it can be taken in and out of the rolling line, and the large-diameter work rolls 2, 3 It can be rolled in an offset state with respect to a perpendicular line passing through the center. Further, the small-diameter work roll 1 and the large-diameter work roll 2 can be integrally shifted in the same axial direction, and the large-diameter work roll 3 is opposite to the small-diameter work roll 1 and the large-diameter work roll 2. It is possible to shift in the direction.

The details of the rolling mill shown in FIG. 1 will be described with reference to FIGS. 2 to 5. The beam 10 is adapted to be slidable in the roll axial direction on the upper and lower surfaces of the block 9 fixed to the inside of the window portion of the housing 8. , 11, and beams 10, 10, 1
Work roll shaft boxes 12 and 13 for rotatably supporting the large-diameter work rolls 2 and 3 are provided between 1 and 11 so as to be lifted and lowered, and roll balance and roll bending are performed on the large-diameter work rolls 2 and 3. Fluid pressure cylinders 14 and 15 adapted to be applied are arranged with respect to the beams 10 and 11, and piston rods 16 and 17 of the fluid pressure cylinders 14 and 15 are provided.
The front end is the brim portion 18, 1 of the work roll shaft box 12, 13.
Contact 9

A rotatable rotary shaft box 20 is attached to the shaft portion of the large diameter work roll 2, and a small diameter work roll shaft is provided in a notch provided in the rotary shaft box 20 so as to be movable toward the center of the large diameter work roll 2. The box 21 is fitted and the small diameter work roll shaft box 21 is rotatably supported by the small diameter work roll shaft box 21 so that the small diameter work roll shaft box 21 approaches and separates from the large diameter work roll 2. A fluid pressure piston 22 capable of advancing and retreating is fitted, and the tip of the fluid pressure piston 22 is brought into contact with the flange portion 23 of the small diameter work roll shaft box 21 to impart roll balance and roll bending to the small diameter work roll 1. Thus, the fluid pressure cylinder 24 is arranged in a substantially horizontal state on a predetermined beam of the beam 10.
The distal end of the piston rod 25 is detachably connected to the side portion of the rotary shaft box 20 so that the rotary shaft box 20 can be rotated and positioned at a required offset.

A rotating shaft box 20 pivotally supported on the shaft portion of the large-diameter work roll 2 has a rack 44 fixed to the outer periphery thereof, and a shaft 46 to which a pinion 45 meshing with the rack 44 is fixed is a work roll shaft box 12
A hydraulic motor or the like in which the shaft 46 is passed through and the shaft 46 is rotatably supported by a bearing 47 fitted around the flange 18, and the other end of the shaft 46 is attached to the side of the shaft box 12. Is connected to the driving device 50 of FIG. Further, a support block 49 is housed in a recess 51 provided at a required position on the inner side of the beam 10 so that the support block 49 is rotated by the rotation of a shaft 48 and is positioned laterally from the recess 51 and can be fixed to that position by a brake or the like. Then, the rotary shaft box 20 can be supported at a position rotated by about 90 degrees as shown in FIG.
Further, when rolling with the small-diameter work roll 1, pressure oil does not act on the drive device 50, and the rotary cylinder 20 can be offset to an arbitrary position by the fluid pressure cylinder 24.

Arms 26a, 26 facing outward of the beams 10, 11
b, 27a, 27b are projected, and the arms 26a, 2
The fluid pressure cylinders 28 and 29 are attached to 7a in parallel with the rolls, the piston rods 30 and 31 of the fluid pressure cylinders 28 and 29 are connected to the housing 8, and the arms 26a, 26b, 27a and 27b are fluid pressure cylinders. Two
8 and 29, the fluid pressure cylinders 32 and 33 are pivotally supported substantially in parallel with the pins 26 and 35, and the links 36 and 37 and the hook 3 are pivotally supported on the arms 26a, 26b, 27a and 27b.
8 and 39 are fixed, the piston rods 40 and 41 of the fluid pressure cylinders 32 and 33 are connected to the links 36 and 37, and the fluid pressure cylinders 32 and 33 are actuated, so that the hooks 38 and 39 work. It can be engaged with and disengaged from the grooves provided in the axle boxes 12 and 13.
Reference numerals 42 and 43 in the figure denote spare roll axle boxes.

For example, as shown in FIG. 1, when rolling is performed by using the small diameter work roll 1 and the large diameter work roll 3, the rotary cylinder 20 is rotated by the fluid pressure cylinder 24 and positioned at a predetermined position. As a result, the small diameter work roll 1 is positioned below the large diameter work roll 2. Also, the fluid pressure cylinders 28, 2
When 9 are operated in the opposite directions, arms 26a, 27
a, the large-diameter work rolls 2 and 3 are shifted in opposite directions via the work-roll shaft boxes 12 and 13,
By this shift, the small-diameter work roll 1 and the large-diameter work roll 2 are integrally shifted by the same amount in the same direction via the rotary shaft box 20.

Thus, at the time of rolling, the small diameter work roll 1 and the large diameter work roll 2 are operated by the fluid pressure piston 22 and the fluid pressure cylinder 14.
Is pressed against the large-diameter work roll 2 and the retaining roll 4, and the large-diameter work roll 3 is pressed against the retaining roll 5 by the fluid pressure cylinder 15 so that the roll gap between the small-diameter work roll 1 and the large-diameter work roll 3 becomes a predetermined gap. The work piece 1 is held, and the fluid pressure piston 22 applies roll bending to the small diameter work roll 1, and the fluid pressure cylinder 15 applies roll bending to the large diameter work roll 3 to perform rolling while controlling the sectional shape of the rolled material. In the case of this rolling, large diameter work roll 2
Acts as an intermediate roll. When the same material is rolled by rolling with a small diameter work roll 1, the rolling load can be made smaller than that with a large diameter work roll, and if the same rolling load is used, the rolling reduction increases and the number of passes decreases. Moreover, rolling of difficult-to-machine materials such as high-strength steel can be easily performed, and the small-diameter work roll 1 and the large-diameter work roll 2 are shifted in opposite directions, so that one width end of the rolled material has a small diameter. By positioning the work roll 1 in the vicinity of one end thereof and the other width end of the rolled material in the vicinity of one end of the large-diameter work roll 2, rolling is performed to reduce edge drop of the rolled material. At this time, if a taper portion is provided at the roll ends of the small-diameter work roll 1 and the large-diameter work roll 2, it is more effective in preventing edge drop. Also, the reason why the roll end of the work roll is not completely aligned with the width end of the rolled material is to prevent rolling of the width end of the rolled material from the work roll when there is a camber of the rolled material. Of course, when there is no camber, it is needless to say that the edge drop can be prevented more effectively by aligning the width end of the rolled material with the roll end of the work roll.

When switching the work roll used for rolling from the small-diameter work roll 1 to the large-diameter work roll 2, the fluid pressure cylinder 24
After separating the tip of the piston rod 25 from the rotary shaft box 20, the pinion 45 is rotated by the drive device 50, the rotary shaft box 20 is rotated to the standby position shown in FIG. 4, and the support block 49 is rotated. The beam 10 is laterally projected and fixed in position, the rotating shaft box 20 is supported by the beam 10 via the support block 49, and the small-diameter work roll 1 is used for large-diameter work as shown in the right half of FIG. Positioned beside the roll 2, the large diameter work roll 2 is lowered by the fluid pressure cylinder 14, and the retaining roll 4 is lowered by a reduction screw (not shown).
The large-diameter work rolls 2, 3 are pressed against the reserve rolls 4, 5 by setting the roll gap between the large-diameter work rolls 2, 3 to a predetermined gap, and the work rolls 2, 3 are rolled by the fluid pressure cylinders 14, 15. Bending is applied and rolling is performed. In this case, the rolling load is increased as compared with the case where the small-diameter work roll 1 is used, and thus it is suitable for rolling a material such as a mild steel plate. It is also suitable for rolling in an upstream pass that requires a large reduction amount. This is because in the case of a large-diameter work roll, the amount of reduction can be increased due to the limitation of the biting angle.

As described above, roll switching between the small-diameter work roll 1 and the large-diameter work roll 2 can be performed between passes without stopping the rolling line, thus improving the production efficiency.

When replacing the large-diameter work rolls 2 and 3 with new rolls, the rolling line is stopped in the same manner as in the conventional case, but the fluid pressure cylinders 32 and 33 are actuated to move the hooks 38 and 39 to the work roll shaft box. The work rolls 1 and 2 are separated from the work roll shaft boxes 12 and 13, and the work roll shaft boxes 12 and 13 are pulled out in a lateral direction together with the work roll 1 having a small diameter.

The small-diameter work roll 1 may be rolled in an offset state as shown in FIG. 7 without being positioned directly below the large-diameter work roll 2 as shown in FIG. In this case, the rolling load may cause the small-diameter work roll 1 to receive a horizontal force and bend in the horizontal direction. Therefore, when performing such rolling, the distribution torque of the electric motors 6 and 7 is adjusted, and the horizontal component force of the tangential force F due to the transmission torque of the small diameter work roll 1 and the rolling reaction force acting on the small diameter work roll 1 by rolling. Rolling is performed so that the horizontal component force of R becomes substantially equal. Thus, the horizontal forces acting on the small-diameter work roll 1 are canceled out, and the bending of the small-diameter work roll 1 in the horizontal direction is reduced.

In the present invention, the small-diameter work roll and the large-diameter work roll may be arranged both above and below the rolling line, and various changes may be made without departing from the easiness of the present invention.
Of course, etc.

[Effects of the Invention] According to the rolling mill of the present invention, <I> the number of rolling passes can be reduced, and the large-diameter work roll and the small-diameter work roll can be switched inline, and the small-diameter work roll can be used. Can be easily replaced without stopping the rolling line,
Improves production efficiency, <II> Rolling difficult-to-process materials can be easily performed by simply switching work rolls, and no separate rolling mill is required, so equipment costs and operation and maintenance costs are low. III> Since the work rolls are shifted in the axial direction, the cross-sectional shape of the rolled material is good and a good quality product can be obtained. <IV> Roll bending can be applied to the small diameter work rolls. As a result, the cross-sectional shape of difficult-to-machine materials will be good,
It is possible to obtain various excellent effects such as obtaining a product of higher quality.

[Brief description of drawings]

1 to 7 are explanatory views of an embodiment of the rolling mill of the present invention, FIG. 1 is an overall view, and the left half of FIG. 2 is a detailed view when a small diameter work roll is used, FIG. The right half of FIG. 3 is a detailed view of the case where the small diameter work roll is not used, FIG. 3 is an explanatory view of the rotating mechanism of the rotary shaft box, FIG. 4 is an explanatory view of the support mechanism when the rotary shaft box is rotated, and FIG. 2 is a plan view of the upper and lower diameter work rolls in FIG. 2, and FIG. 6 is an explanatory view when the work rolls are shifted. The upper half is a shift state of the upper and lower diameter work rolls. FIG. 7, a lower half is an explanatory view of a shift state of a lower large-diameter work roll, and FIG. 7 is an explanatory view of a state where a small-diameter work roll is offset. In the figure, 1 is a small diameter work roll, 2 and 3 are large diameter work rolls, 20 is a rotary shaft box, 21 is a small diameter work roll shaft box, 24 is a fluid pressure cylinder, 26a, 26b, 27a and 27b are arms, 28 and 29. Is a fluid pressure cylinder, 32 and 33 are fluid pressure cylinders, and 38 and 39 are hooks.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Chiyo Itagaki No. 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawajima Harima Heavy Industries, Ltd. Yokohama Second Factory (56) Reference JP-A-58-29506 (JP) , A) JP-A-58-97405 (JP, A) JP-A-58-173007 (JP, A)

Claims (1)

[Claims] 1. A rotatable rotary shaft box is fitted to the shaft portion of at least one large-diameter work roll of a pair of upper and lower large-diameter work rolls which can be mutually shifted in the axial direction. A small-diameter work roll that can approach and separate from the center of a large-diameter work roll on which the rotary-shaft box is mounted and that rotatably supports a small-diameter work roll that is arranged parallel to the large-diameter work roll. A rolling mill, wherein a shaft box is fitted, and a fluid pressure cylinder for imparting roll balance or roll bending to the small diameter work roll is interposed between the small diameter work roll shaft box and the rotary shaft box.