JPS6355366B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling mill, and more particularly to a shape control device in a rolling mill.

Conventionally, in a rolling mill, as shown in Fig. 1, a load vector as shown by an arrow g is applied to axle boxes c and d at both ends of work rolls a and b by hydraulic pistons e and f. Generally, a method is used in which the thickness distribution in the width direction of the rolled plate h is controlled by giving bends to a and b. However, in this method, when the width of the rolled plate h becomes narrow, the contact area between the work rolls a and b and the backing roll (not shown) that is in contact with the work rolls a and b gets in the way. In this case, there was a problem that the effect of work roll bending could not be fully exhibited.

Therefore, 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 hydraulic piston e is attached to the reaction force receiving beam j provided in the housing i. , f to apply bending load.
However, in the case of this system, the hydraulic piston e,
Since the pressing position of f changes as the work rolls a and b slide in the axial direction, strain is applied to the pressure receiving beam j, and it is not possible to obtain a uniform bending load.

The present invention was made in view of these circumstances,
At least one of the upper and lower work rolls is configured to be movable in the roll axis direction, and a contact piece that presses the shafts of the upper and lower work rolls to apply bending force to the upper and lower work rolls is connected to the shaft part. A rolling mill, characterized in that the contact pieces are arranged facing each other on both sides in the rolling line direction, and each contact piece is connected to a drive device attached to a housing, so that the facing contact pieces can move toward and away from each other. This is related to.

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

As shown in FIGS. 4 and 5, work rolls 1,
Hydraulic cylinders 4 and 4' are mounted on both sides of the housing 3 in the direction of the rolling line (passing line of the rolling plate 5).
A support bracket 7, is attached to the tip of the piston rod 6, 6' of each cylinder 4, 4'.
7' and each support bracket 7,
A pair of upper and lower rotary rollers 8, 8, 8', 8' are pivotally attached to 7' to form a bending device. , 8' is the axle box 1 of the work rolls 1 and 2.
It is configured so that it can directly contact the shaft portions 1' and 2' located outside the 0 and 11 portions. Note that 9 and 9' are pressure regulating valves.

As shown in FIGS. 6 and 7, each of the shaft boxes 10 and 11 provided on the shaft portions 1' and 2' of the work rolls 1 and 2 has a bearing 12 provided therein and an inner spacer 13 and an outer spacer 14. The outer spacer 14 is supported by a half-split open/close ring 17 which is tightened and fixed by bolts 15 and nuts 16.

The sliding mechanism for the work rolls 1 and 2 is as shown in FIGS. 8 to 10. That is, the axle box 10,1
1 is supported by frames 18 and 19 disposed below the rolling line of the housing 3 window, and the frames 18 and 19 are fitted into the housing 3 window position between the frames 18 and 19. Hydraulic pistons 21, 2 in the block 20 provided
2, they are pressed in directions away from each other. Also, the frames 18 and 19 are attached to the housing 3 with bolts 2.
The longitudinal position is regulated by a keeper plate 24 which is fixed at three positions. Further, on the frames 18 and 19, a screw rod 27 having a sprocket 28 connected to a sprocket 25 provided on the housing 3 and a chain 26 attached to the end thereof is attached. The axle boxes 10 and 11 are rotatably fitted in the axle boxes 10 and 19 in an exposed state, and screw groove surfaces 29 are formed on the sides of the axle boxes 10 and 11 to engage with the exposed screw surfaces of the screw rods 27, By rotating the sprocket 25, the chain 26, the sprocket 28, and the screw rod 2 are rotated.
7. The screw groove surfaces 29 of the axle boxes 10, 11 are configured so that the work rolls 1, 2 can be slid in the axial direction via the axle boxes 10, 11. In the figure, 30 is an air cylinder 3 to prevent the chain 26 from slackening.
This is a wheel attached to the rod end of 1.

The drive mechanism for the work rolls 1 and 2 is as shown in FIG. That is, the drive motor 32 is connected to a gear 35 in a gear box 34 via a coupling 33, and a gear 36 that meshes with the gear 35 and a gear 37 that meshes with the gear 36 are disposed inside the gear box 34. A coupling 38 is connected to the gear 36, and the shaft portion 1' of the work roll 1 is connected via a spindle 39, and a coupling 40 is connected to the gear 37.
The shaft portions 2' of the work rolls 2 are connected to each other via a spindle 41. In addition, the gears 35, 36, 3
7 are parallel teeth, so-called straight teeth, and are configured so that rotational force can be transmitted even if they slide relative to each other in the axial direction.

In a rolling mill configured as described above, when sliding the work rolls 1 and 2 in accordance with the width dimension of the rolling plate 5, first, the sprocket 25 attached to the housing 3 is moved by the bolt head 25' of the sprocket 25. (Other means may also be used) to rotate it in the desired direction. This rotational force is transmitted to the frame 1 via the chain 26 and sprocket 28.
Screw rod 27 inserted into 8, 19
is transmitted to. Furthermore, the rotation of the screw rod 27 causes the axle boxes 10, 11 to move through the engagement of the screw groove surfaces 29 formed on the sides thereof, thereby causing the work rolls 1, 2 to slide in opposite directions, respectively. At this time, the axial thrust load generated on the work rolls 1 and 2 is transmitted through the bearings 12 to each axle box 1.
0, 11, from each axle box 10, 11 via the screw groove surface 29 to the screw rod 27, and further from the screw rod 27 to each frame 1.
Conveyed to 8,19. The frames 18 and 19 are attached to the keeper plate 2 which is fixed to the housing 3 by bolts 23.
Since the longitudinal position is regulated by 4, the thrust load can be received.

Furthermore, the frames 18 and 19 support the hydraulic piston 2 in the block 20 fitted in the window of the housing 3.
1 and 22 in the direction away from each other, this hydraulic load is transmitted to the projecting flanges of the axle boxes 10 and 11 via the frames 18 and 19, thereby causing a gap between the work rolls 1 and 2. A roll gap can be formed before the rolling plate 5 gets caught, and this load can cause the backing rolls to idle due to the frictional force between the rolls.

In such a state, when performing bending control of the rolling plate 5 caught between the work rolls 1 and 2, the piston rods 6 and 6' of the left and right hydraulic cylinders 4 and 4' are connected to the pressure regulating valves 9 and 9'. The rollers 8, 8 and 8', 8' are opposed to each other and pressed between the shaft portions 1', 2' of the work rolls 1, 2 to apply a bending load.

Since the bending load is applied in this way, even if the work rolls 1 and 2 slide from the position of the solid line to the position of the imaginary line in FIG.
0 and 11 are simply used to support the work rolls 1 and 2, and the bending load point is always at a constant position, so that the bending load can be stably applied. Also, when changing the work rolls 1 and 2, the piston rods 6 and 6' are contracted and the respective rollers 8, 8,
Since it is only necessary to move 8' and 8' backward, the roll unit can be easily handled in a roll shop or the like.

FIG. 12 shows another example of the arrangement of the bending device, in which the shaft boxes 10 and 11 are placed on the outside of the shaft portions 1' and 2' of the work rolls 1 and 2, respectively, and the rollers 8 and 11 that apply the bending load, 8, 8', 8' to axle box 1
Cylinder 4, 4' so that it is located inside 0, 11
This is what was installed.

When this method is adopted, it goes without saying that the same effects as in the embodiment described above can be achieved, but since the axle boxes 10 and 11 are installed outside, the axle boxes 10 and 11 can be easily replaced. Become.

Also, as shown in FIG. 13, instead of the rollers 8, 8, 8', 8' in the previous embodiment, pads 8a, 8a' that produce lubricating properties or some kind of liquid oil film are used on the piston rods 6, 8, 8' of the cylinders 4, 4'. Even if it is attached to the tip of 6', the same effect as in the above embodiment can be achieved.

Furthermore, in the present invention, the work rolls 1 and 2 have tapers 1a and 2a at their body ends as shown in FIG.
By applying special processing to the width end portions of the rolled plate 5, edge drops that occur during normal rolling can be prevented, contributing to more accurate control of the plate shape.

In the above embodiment, the upper and lower work rolls are configured to be slidable, but only one of them may be configured to be slidable, and the width end of the plate and the roll body end do not necessarily have to be aligned. However, the roll body end may be positioned at any position as necessary or depending on the degree of wear of the roll and the condition of flaws, and various other changes may be made without departing from the gist of the present invention. Of course.

As described above, according to the present invention, (i) the point at which the work roll bending load is applied is always at a constant position, so bending can be applied stably.

(ii) Even when the width of the sheet is narrow, the contact surface between the work roll and the backing roll does not impede the effectiveness of roll bending, so the bending effect is good even when the width of the sheet is narrow.

(iii) Since the bending device is attached to the housing, the roll unit can have a simple structure and is easy to handle in the roll shop.

(iv) Since the bending load does not differ depending on the plate width, no unstable moment is generated on the machine, and there is little concern about mechanical strength.

etc. will be effective.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of conventional bending control, Fig. 2 is an explanatory diagram showing another example of conventional bending control, Fig. 3 is a side view of Fig. 2, and Fig. 4 is an explanatory diagram of the rolling mill of the present invention. A schematic front view, FIG. 5 is a side view of FIG. 4, FIG. 6 is an explanatory diagram showing the fixed state of the axle box, and FIG.
The figure is an explanatory diagram of the ring used for fixing the axle box, Fig. 8 is an explanatory diagram of the work roll slide mechanism, Fig. 9 is an explanatory diagram of the screw rod screwed onto the pedestal (view from the direction arrow in Fig. 8), Fig. 10 is an explanatory diagram of the screw groove surface provided on the side of the axle box, Fig. 11 is an explanatory diagram of the work roll drive mechanism, Fig. 12 is an illustration of another arrangement example of the bending device, and Fig. 13 is an illustration of the present invention. FIG. 14 is an explanatory diagram showing a modification of the work roll. 1, 2... Work roll, 1', 2'... Shaft, 3... Housing, 4, 4'... Hydraulic cylinder, 6, 6'... Piston rod, 7, 7'... Support bracket, 8,
8'...Rotating roller, 10,11...Axle box, 18,1
9... Frame, 25, 28... Sprocket, 26... Chain, 27... Screw rod, 29... Screw groove surface.

Claims (1)

[Claims] 1. At least one of the upper and lower pair of work rolls is configured to be movable in the roll axis direction, and the upper,
A drive in which contact pieces that press the shaft of the lower work roll to apply bending force to the upper and lower work rolls are arranged facing each other on both sides in the rolling line direction, sandwiching the shaft, and each of the contact pieces is attached to a housing. A rolling mill characterized in that the opposing contact pieces are connected to a device and configured to move toward and away from each other.