JPS58138504A - Rolling mill - Google Patents

Abstract

PURPOSE:To enable the rolling of rolled plates of a narrow width in superior sectional shapes by bringing journal boxes for work rolls into contact with freely vertically movable beams of a rolling mill and transmitting the pressing load of the work rolls to backup rolls through the beams and the jorunal boxes of the rolls. CONSTITUTION:Journal boxes 10, 10' for roll bending of an upper work roll 7 and journal boxes 14, 14' for roll bending of a lower work roll 8 are brough into contact with the tops of upper, lower beams 17, 18 of a rolling mill, and the pressing load of the roll 7 and the roll 8 to an upper backup roll 3 and a lower backup roll 5 is transmitted through the beams 17, 18 and the boxes 10, 14. The rolls 7, 8 are made relatively movable in the axial direction thereof so that roll bending can be applied upon the rolls 7, 8. The steel plates having superior sectional shapes are obtained easily even in the stage of rolling the steel plates of a narrow width.

Description

[Detailed description of the invention] This invention relates to a rolling mill.

Conventionally, in a rolling mill, as shown in Fig. 1, hydraulic pistons e and f are connected to axle boxes c and d at both ends of work rolls a and b.
Generally, a method is used in which a gJ weight vector as shown by an arrow g is given to give bending to the work rolls a and b to control the thickness distribution in the width direction of the rolled plate b. However, in this method, when the width of the rolled plate h becomes narrower, the work roll a. The problem is that the effect of work roll pending cannot be fully exerted when the rolling plate h is narrow because the contact portion between b and the work roll 1 and a backing roll (not shown) that is in contact with b becomes an obstacle. It had

In order to solve this problem, as shown in Figs. 2 and 3, the work rolls a and b are made to be able to slide in the axial direction, and the reaction force receiver provided in the housing i is connected to the beam j.
A pending load is applied by pressing hydraulic pistons e and f against the cylinder. However, in this case, since the pushing positions of the hydraulic pistons e and f change due to the axial sliding of the work rolls a and b, the reaction force receiver is forced on the beam j, and it is not possible to obtain a uniform pending load. could not.

In the present invention, a roll axle box that supports a work roll is brought into contact with a beam that can be raised and lowered, so that when the work roll is pressed against a backing roll, the load can be transmitted through the beam and the roll axle box, and the work roll is It is an object of the present invention to provide a rolling mill which is movable in the axial direction and which is capable of applying roll bending to the ◆W work rolls so that the cross-sectional shape of the rolled plate is improved.

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

4 to 10 show an embodiment of the present invention.

Housing window 2 provided in rolling mill housing 1, 1
．． Upper holding roll shaft boxes 4, 4, which rotatably support the upper holding roll 3, are fitted above 2 so as to be able to rise and fall freely, and
Below the housing windows 2, 2, the lower support roll 5 is rotatably supported and the lower support roll shaft box 6. d so that it can be moved up and down.

Upper and lower work rolls 7°8 are disposed between the upper and lower holding rolls 3 and 5, and upper roll balance shaft boxes 9 are provided on both sides of the shaft of the upper work roll 7.
. The upper work roll bending cylinder 11 is mounted on the upper part of the upper work roll bending shaft box 1o, and the rod of the upper work roll bending cylinder 11 is arranged so that the upper work roll bending cylinder 11 is surrounded by the shaft box 1o. The lower end is engaged with an axle box 12 that is pivotally attached to one end of the three shafts of the upper work roll, and the axle box 12 is fitted into the hollow part of the axle box 10 for upper work roll bending, so that the upper work roll is rotated during roll bending. A bending axle box 1° and an axle box 12 are made to be able to slide relative to each other. Lower roll balancing axle boxes 13 and 13 are pivotally mounted on both sides of the lower work roll 8 axis, and the lower work roll is located opposite to the position where the upper work roll bending axle box 10 is attached with reference to the center position of the rolling mill. A lower work roll bending axle box 14 is pivotally attached to one end of the roll 8 shaft part, and the lower work roll bending axle box 14 is extended downward, and the lower work roll bending axle box 14 is used to bend the lower work roll 5. A lower work roll bending cylinder 15 is attached to the lower part of the lower work roll bending shaft box 14 so as to surround one end of the shaft,
The upper end of the rod of the lower work roll bending cylinder 15 is engaged with the axle box 16 pivotally connected to one end of the lower support roll 5 shaft, and the axle box 16 is fitted into the hollow part of the lower work roll bending axle box 14. The axle box 14 for lower work roll bending and the axle box 16 can be slid relative to each other during roll bending.

An upper beam 17 and a lower beam 18 extending in the direction of the roll axis force are arranged in the housing windows 2 and 2' so as to be able to move up and down. A roll balance piston 19 is installed between the upper and lower beams 17 and 18 so as to maintain the position in a predetermined state,
The upper roll balance axle boxes 9, 9' are placed on the upper beam 17, and the lower roll balance axle box x3.1j is fitted into the groove of the lower beam 18.

Arms 9m and 13a extending in the roll axis direction are integrally fixed to the upper and lower roll balance shaft boxes 9°13 on the same side, and the arms 9m and 13a are made to protrude toward the outside of the rolling mill, and the upper and lower rolls are Balance axle boxes 9, 13 and arms 9a, 13a both IIIMI
A long rack 20° 21 is fixed in the direction of the roll axis.

Pinions 22 and 23 that mesh with the racks 20.21 are pivotally connected to the upper and lower beams 17.18 via vertical pins 24 and 25, and pinions 26.27 are also pivotally attached to the upper and lower beams 17.18 via vertical pins 28 and 29. 24 and 26.23 and 27
The vertical shafts 30, 31 connected to the vertical pins 28, 29 are connected to a drive (not shown) so that the upper and lower working rolls 7.8 can be moved in the axial direction.

In addition, 32 in the figure is a hydraulic piston for use at the time of roll exchange.

Next, the operation of the present invention will be explained.

During rolling, pinions 26, 22, 27, 23,
Axle box 9 for upper and lower roll balance via racks 20 and 21
, 13 to move the upper and lower working rolls 7.8 in the axial direction. During this movement, the vertical roll balance shaft box 9',
ti also moves in the roll axis direction together with the upper and lower work rolls 7.8, and the shaft portions of the upper and lower work rolls 7.8 smoothly slide on the bearings of the upper and lower work roll bending axle boxes 10 and 14 in the roll axis direction. , Axle box 9 for upper and lower roll balance
9.13.1 slides on the contact surfaces of the upper and lower beams 17 and 18, so no lateral force acts on the roll balance piston 19. Further, the upper and lower work rolls 7.8 in FIG. 4 indicate the positions when rolling the maximum sheet width, and in the case of a narrow sheet width, the upper work rolls 7 and 8 in FIG. Work roll 8 is located on the right side.

When the upper and lower work rolls 7.8 are moved to a predetermined position in the roll axis direction, the upper support roll 3 is raised or lowered to a predetermined position via the upper support roll shaft box 4° 4' by a lowering screw (not shown), and the roll By operating the balance piston 19' to raise the upper beam 17, the upper roll balance axle box 9. d is also raised, and the upper work roll 7 is brought into close contact with the upper backing roll 3, and the upper and lower work rolls 7.
Rolling is started while maintaining a predetermined interval of 8. The reaction force when the roll balance piston 19 is activated is transmitted from the lower beam 18, the lower roll balance shaft box 13° 13', and the lower work roll 8 to the lower backing roll 5.

When applying roll bending during rolling, the upper and lower work roll bending cylinders 11.15 are operated, bending is applied to the upper and lower work rolls 7.8 via the upper and lower work roll bending shaft boxes 10.14, and the plate is rolled. Shape control is performed.

A uniform bending load can be obtained without applying excessive force to the upper and lower beams 17 and 18 during roll bending.

11 to 13 show another embodiment of the present invention, which differs from the previous embodiment in that in the above embodiment, the upper work roll bending cylinder is disposed on the longitudinal side of the upper work roll, A lower work roll bending cylinder is disposed in the longitudinal direction of the lower work roll at a position opposite to the upper work roll bending cylinder, and the reaction force generated by the operation of the upper work roll bending cylinder is While a balance cylinder is provided between the upper and lower beams so as to be supported by the upper and lower support roll shafts, in this embodiment, work roll bending cylinders 33 and 3i are provided on both sides of the shaft in the longitudinal direction, and work roll bending cylinders 33 and 3i are provided on both sides of the shaft in the longitudinal direction. Axle boxes 10.14.1d and 14' for vertical work roll bending with cylinders ss and 3i provided on both sides in the longitudinal direction of the shaft
protrusions 34, 34' are provided on the housing window, and upper roll balancing pistons 35, 3s are protruded from the upper surface of flls+, si. The lower roll balancing pistons 36, 36 are supported on the lower surface of the protrusion 34, si.

Even with such a configuration, when the upper and lower work rolls 7.8 move in the axial direction, the upper and lower roll balance shaft boxes 9, 9', 13,
1 slides on the upper and lower beams 17 and 18, so the upper and lower roll balance pistons 35°35', 36, sg
A uniform bending load can be obtained without applying any lateral force to the upper and lower beams 17 and 18 during roll bending. In the drawings, the same reference numerals as those shown in FIGS. 4 to 10 indicate the same components.

In the embodiments of the present invention, a case has been described in which the movement of the upper and lower work rolls in the axial direction is performed using racks and pinions. It goes without saying that it may be provided mainly inside the roll balance axle box, and that other changes may be made without departing from the gist of the present invention.

Since the rolling mill of the present invention has the above-described configuration, it can achieve various excellent effects as described below.

0) Since the point at which the roll bending load is applied can be selected from a wide range, stable bending can be performed.

(1) Even when the width of the rolled plate becomes narrow, the contact surface between the work roll and the backing roll does not affect the effect of roll bending, so the bending effect is good even when the width of the rolled plate is narrow.

(G) Since the work roll is used by sliding, roll wear can be made uniform in the width direction.

0 Since no bending load is applied to the beam, there is no need to increase the strength of the beam, and since there is no need to shift the beam, the balance cylinder is not damaged, and the contact pressure distribution on the axle box is uniform, so the bearing life is extended. becomes longer.

0 Since it becomes possible to apply either increase bending or decrease bending, workability becomes even better.

■ Since there is no need for roll bending points, roll bending is more effective on the side where the length of the part of the work roll where it contacts the backup roll is shorter with respect to the center of the rolling mill.

(b) The above makes it possible to improve the cross-sectional shape of the rolled plate and also facilitate maintenance.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional rolling mill, Fig. 2 is an explanatory diagram of another example of a conventional rolling mill, Fig. 3 is a side view of Fig. 2, and Fig. 4 is an illustration of a rolling mill of the present invention. A front view of the embodiment, FIG. 5 is a view taken in the v--■ direction of FIG. 4, FIG. 6 is a view taken in the Vl-V1 direction of FIG. 4, and FIG. 8 is a view taken in the direction ■-■ of FIG. 4, FIG. 9 is a front view of the work roll shift device used in the rolling mill of the present invention, and FIG.
Fig. 11 is a side view of one end of the roll in another embodiment of the rolling mill of the present invention, Fig. 12 is a side view of the other end of the same roll, and Fig. 13 is a side view of the other end of the roll. In the side view of the balance axle box, the right half shows the same side as in Fig. 11, and the left half shows the same side as in Fig. 12. In the figure, 1 and 1' are the rolling mill housing, 3 is the upper roll, and 5 is the rolling mill housing.
is the lower work roll, 7 is the upper work roll, 8 is the lower work roll,
9 and 9' are axle boxes for upper roll balance, 10 and 10 are axle boxes for upper work roll bending, 11 are cylinders for upper work roll bending, 12 and 16 are axle boxes, ls and 1i
is the axle box for lower roll balance, 14.14' is the axle box for lower work roll bending, 15 is the cylinder for lower work roll bending, 17 is the L beam, 18 is the lower beam, 19
is the roll balance piston, 20.21 is the rack, 22
, 23, 26, 27 are pinions, 3s, 3j are work roll bending cylinders, 34, 34' are protrusions, 35, sg are upper roll balance pistons,
3a and 3e indicate lower roll balance pistons. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd. Figure 5 Figure 1, 3 Figure 6

Claims (1)

[Claims] l) A roll axle box that pivotally supports a work roll is brought into contact with a beam that can be raised and lowered so that when the work roll is pressed against a backing roll, the load can be transmitted through the beam and the roll axle box. A rolling mill characterized in that a device for moving in the axial direction and a work roll bending device are arranged at required positions.