JPS6347362Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a rolling mill having a function of controlling the shape of rolled material. In recent years, in order to control the thickness shape of rolled material in the width direction, a method of bending work rolls in a four-high rolling mill has been developed and various methods have been implemented.
Conventional roll bending methods have had limitations in their ability to control the shape of rolled materials. In other words, when rolling a plate from a narrow width to a wide width, the desired roll profile is not uniform and changes depending on the width of the plate, and simply changing the roll bending of the roll axle box is not sufficient to obtain the ideal roll profile. It is enough. In addition, in order to obtain a rolled product with a good shape and little change in thickness, especially in the width direction, the deformation of the work rolls due to the rolling load should be minimized.
It is also important to provide an optimal roll profile to increase the shape modification ability. Therefore, in recent years, a rolling mill having a structure as shown in FIG. 1 has been considered. In the figure, 1 is a housing, 2 is an upper roll shaft box that is fitted to the housing 1 so that it can be raised and lowered, 3 is an upper roll that is pivotally connected to the upper roll shaft box 2, and 4 is fitted to the housing 1 so that it can be raised and lowered. The combined lower support roll axle box, 5 is the lower support roll pivotally connected to the lower support roll axle box 4, and 6 is the lower support roll axle box 4.
A small-diameter upper work roll 7 and a lower work roll 8 are disposed between the upper support roll 3 and the lower support roll 5. The centers of the upper and lower work rolls 7 and 8 are shifted toward the rolling mill exit side with respect to the rolling line formed by connecting the centers of the upper and lower backing rolls 3 and 5, and the centers of the upper and lower work rolls 7,
8 is in a so-called offset state, and in the rolling machine exit direction of the upper and lower work rolls 7 and 8 are upper and lower presser rolls 9 and 10 that contact the sides of the upper and lower work rolls 7 and 8, and the upper and lower presser rolls. roll 9,
Upper and lower reinforcing rolls 11 and 12 that contact the sides of 10
are arranged sequentially. The upper presser roll 9 and the upper reinforcing roll 11 are integrally pivoted to a bracket (not shown), and the lower presser roll 10 and the lower reinforcing roll 12 are also integrally pivoted to a bracket (not shown). The upper and lower reinforcing rolls 11 and 12 are divided into a plurality of parts in the axial direction, and by displacing each of the upper and lower reinforcing rolls 11 and 12 in the longitudinal direction of the rolling mill, the upper and lower work rolls 7 are moved through the upper and lower presser rolls 9 and 10. , 8 in the longitudinal direction of the rolling mill, and this lateral displacement displaces the upper and lower work rolls 7, 8 in the vertical direction to control the shape of the rolled material 13. The relationship between the amount of displacement of the upper and lower work rolls in the longitudinal direction of the rolling mill and the amount of displacement of the upper and lower work rolls in the vertical direction due to the amount of displacement of the upper and lower work rolls in the longitudinal direction of the rolling mill in the above-mentioned rolling mill is explained with reference to FIG. , the diameter of the upper work roll 7 is r, the amount of offset is e, the amount of lateral displacement of the upper work roll 7 is Δe, and the amount of vertical displacement of the upper work roll 7 is ΔY.

The following relationship holds true, and from this equation it can be understood that when the radius of the backing roll is large, the vertical displacement amount ΔY of the work roll cannot be increased unless the offset amount e is increased. However, in the rolling mill shown in Fig. 1, the retainer roll must transmit rolling force and prevent deformation of the work roll, so its outer diameter must be increased, and therefore the work roll's rolling mill In order to effectively obtain vertical displacement by longitudinal displacement, it is necessary to increase the offset amount e, and if the offset amount e is increased, the width W of the housing 1 increases, which is disadvantageous structurally. In addition, in order to effectively control the thickness and shape of rolled material,
As mentioned above, it is desirable to use the roll bending method in which the upper and lower work rolls 7 and 8 are bent, but since the outer diameter of the upper and lower work rolls 7 and 8 is small, it is not possible to insert a roll bending device between them. Even if a roll bending device is inserted between the upper and lower backing rolls 3 and 5, a very large bending force is required to vertically displace the upper and lower backing rolls 3 and 5 because of their large outer diameters. The present invention was made for the purpose of eliminating the above-mentioned drawbacks of the conventional means, and includes a pair of intermediate rolls that are movable in the axial direction between a pair of retainer rolls, and a pair of intermediate rolls that are movable in the axial direction. A pair of work rolls whose centers are offset on the entry side or exit side of the rolling mill with respect to the reduction line formed by connecting the centers of the pair of intermediate rolls are arranged between them, and the offset side of the pair of work rolls is A presser roll is disposed in contact with the outer peripheral side of the work roll and supported by a bracket attached to the inside of the rolling mill housing, and is movable in the longitudinal direction of the rolling mill on the side of the bracket opposite to the work roll. A reinforcing roll, which is divided into a plurality of parts and arranged at required intervals in the roll axis direction, is fitted onto the shaft.
A presser plate is disposed so as to be in contact with the outer peripheral side of the presser roll on the side opposite to the work roll, and a presser plate is attached to the shaft to displace the reinforcing rolls individually in the longitudinal direction of the rolling mill, and the presser plate is moved in the longitudinal direction of the rolling mill. This device is characterized in that a driving device for pushing and pulling is disposed on the opposite side of the catching roll to the work roll. Embodiments of the present invention will be described below with reference to the drawings. A block 14 is attached to the window portion of the housing 1 as shown in FIG.
upper and lower intermediate roll shaft boxes 15, which are attached to the
16, upper and lower intermediate rolls 17 and 18 are rotatably pivoted, and levers 19 and 20 are mounted on one side of the upper and lower intermediate roll shaft boxes 15 and 16 as shown in FIG.
protrude outwards from the housing 1. Above the upper intermediate roll 17, the upper holding roll shaft box 2
At the same time, a hydraulic cylinder 33 whose axis extends in the roll axis direction is installed on one side of the upper support roll shaft box 2, and the rod tip of the hydraulic cylinder 33 is installed. An upper work roll 7 is connected to the lever 19 and pivoted to an upper work roll shaft box 21 below the upper intermediate roll 17, and a coupling 3 is attached to one end of the shaft of the work roll 7.
4, a spindle 35 is connected which can be driven by the required drive. Below the lower intermediate roll 18, a lower backing roll 5 pivotally attached to the lower backing roll axle box 4 is disposed, and on one side of the lower backing roll axle box 4, a fluid pressure cylinder whose axis extends in the roll axis direction is provided. 36 into the hydraulic cylinder 36
The lower work roll 8, which is pivotally connected to the lower work roll shaft box 22, is disposed above the lower intermediate roll 18, and a coupling 37 is connected to one end of the shaft of the lower work roll 8. The spindle 38 is connected via the spindle 38 so that it can be driven by the required drive device. The upper and lower work rolls 7 and 8 are in an offset state in which their centers are shifted toward the entrance or exit side of the rolling mill with respect to the rolling line formed by connecting the centers of the upper and lower intermediate rolls 17 and 18, as shown in FIG. Offset amount adjustment cylinders 23 and 24 allow the offset amount e to be adjusted as appropriate. A roll balance cylinder 39 for adjusting the gap between the upper and lower work rolls 7 and 8 is installed between the upper work roll axle box 21 and the lower work roll axle box 22, and also, although not shown, the fluid pressure A calculation and control device is provided to operate the cylinders 33 and 36 in a predetermined direction by a predetermined stroke, and the upper intermediate roll 17 and the lower intermediate roll 18 are configured to move in opposite directions. do. Brackets 25, 26 are attached to the sides of the housing 1, and upper and lower press rolls 9, 1 having approximately the same length as the upper and lower work rolls 7, 8 are attached to the brackets 25, 26.
The upper and lower press rolls 9 and 10 are brought into contact with the upper and lower work rolls 7 and 8, and the grooves 25a and 26a provided in the brackets 25 and 26 are parallel to the upper and lower press rolls 9 and 10, and the rolling mill Fitting the shafts 27 and 28, which are movable in the front and back direction,
Upper and lower reinforcing rolls 11 and 12, which are divided into a plurality of parts at a required interval, are rotatably pivoted to the shafts 27 and 28, and push plates 29, Install 30,
Known tapered wedges 31 and 32 are attached to the rear of the push plates 29 and 30, and the tapered wedges 3
1 and 32 by an appropriate means such as a hydraulic cylinder (not shown) in a direction perpendicular to the paper surface of FIG. , 12, to apply displacement in the longitudinal direction of the rolling mill to the upper and lower work rolls 7 and 8 via the upper and lower press rolls 9 and 10, thereby allowing vertical displacement to be applied to the upper and lower work rolls 7 and 8. It's summery. In addition, in the figure, 6 is a hydraulic pressure reduction cylinder, and 13 is a rolled material. In the rolling mill, the gap between the upper and lower work rolls 7 and 8 is adjusted by the roll balance cylinder 39, and the rolling material 13 is sandwiched between the upper and lower work rolls 7 and 8 to perform rolling.The control is as follows. to be done. That is, to modify the shape of the rolled material 13 in the width direction, push the push plates 29, 30 by raising and lowering the tapered wedges 31, 32 with a fluid pressure cylinder or the like. By applying the displacement, the upper and lower reinforcing rolls 11 and 12 are respectively displaced in the longitudinal direction of the rolling mill, and the upper and lower work rolls 7 and 8 are displaced in the longitudinal direction of the rolling mill via the upper and lower press rolls 9 and 10. On the other hand, the upper and lower work rolls 7 and 8 are bent in the vertical direction by rolling force, and the amount of bending in the vertical direction changes depending on the magnitude of the rolling force. This occurs because both ends that do not contact the material 13 receive a bending moment due to the contact load with the upper and lower reinforcing rolls 11 and 12. Therefore, the pair of upper and lower intermediate rolls 17 and 18 are moved in opposite directions along their axes together with the upper and lower intermediate roll shaft boxes 15 and 16 by hydraulic cylinders 33 and 36, and as shown in FIG.
The tapered transition portions at one end or the other end of 7 and 18 are located at positions corresponding to both ends of the rolled material 13, respectively. By rolling as described above, the portions of the upper and lower work rolls 7 and 8 that are not in contact with the upper and lower intermediate rolls 17 and 18 are bent by the upper and lower intermediate rolls 17 and 18. Therefore, there is an effect as if the lateral rigidity of the upper and lower work rolls 7, 8 has increased, and in this way, there is an effect as if the rigidity of the upper and lower work rolls 7, 8 has increased against the rolling force. To achieve this, the upper and lower reinforcing rolls 11 and 12 are individually fitted into
Even if the rollers 1 and 32 are slightly moved in the longitudinal direction of the rolling mill, the upper and lower work rolls 7 and 8 are likely to be subject to complex deformation, especially when rolling a wide rolled material.
It becomes possible to correct the unsteady bending of the upper and lower work rolls 7, 8 to give the rolled material 13 a uniform shape in the width direction very easily and to a large extent. Further, the apparent work roll crowns of the upper and lower work rolls 7 and 8 are deformed to any desired state, and even a board with a bad shape accompanied by complex waves has a good shape after rolling. It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various 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. The offset amount e can be small (e = 100 to 150 mm in Figure 1, e = 20 to 30 in Figure 3).
mm), the upper and lower work rolls are located toward the center of the housing, making the rolling mill structurally stable. By using a plurality of reinforcing rolls that can be individually displaced in the longitudinal direction of the rolling mill, the displacement of the upper and lower work rolls in the longitudinal direction of the rolling mill can be arbitrarily distributed over the entire length of the roll body. can be given any roll crown. Therefore, the shape correction of the board can be significantly improved, and the product quality of the board is improved.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a conventional rolling mill, and Figure 2 is an explanatory diagram showing how much the work roll is displaced in the vertical direction when the work roll is displaced in the longitudinal direction of the rolling mill. Fig. 3 is an explanatory diagram of the rolling mill of the present invention, Fig. 4 is a left side view of Fig. 3, and Fig. 5 is a cross-sectional view of part of the work roll, presser roll, and reinforcing roll portion of the rolling mill of the present invention. FIG. In the figure, 1 is a housing, 3 is an upper holding roll, 5 is a lower holding roll, 7 is an upper work roll, 8 is a lower work roll, 9 is an upper presser roll, 10 is a lower presser roll,
11 is an upper reinforcing roll, 12 is a lower reinforcing roll, 17
is the upper intermediate roll, 18 is the lower intermediate roll, 19,2
0 is a lever, 21 is an upper work roll shaft box, 22 is a lower work roll shaft box, 23 and 24 are offset amount adjustment cylinders, 29 and 30 are push plates, 31 and 32
is a tapered wedge, 35 and 38 are spindles,
33 and 36 are fluid pressure cylinders, and 39 is a roll balance cylinder.

Claims (1)

[Scope of utility model registration request] A pair of intermediate rolls that are movable in the axial direction are disposed between a pair of backing rolls, and a rolling machine is inserted between the pair of intermediate rolls with respect to a rolling line formed by connecting the centers of the pair of intermediate rolls. A pair of work rolls whose centers are offset on the side or exit side are arranged, and on the offset side of the pair of work rolls,
A presser roll is disposed in contact with the outer circumferential side of the work roll and supported by a bracket attached to the inside of the rolling mill housing, and a shaft movable in the longitudinal direction of the rolling mill is disposed on the side of the bracket opposite to the work roll. A reinforcing roll, which is divided into a plurality of parts and arranged at required intervals in the roll axis direction, is arranged on the shaft so as to be in contact with the outer peripheral side of the presser roll on the side opposite to the work roll. , characterized in that a presser plate for displacing the reinforcing rolls individually in the longitudinal direction of the rolling mill is attached, and a drive device for pushing and pulling the presser plate in the longitudinal direction of the rolling mill is disposed on the opposite side of the reinforcing roll to the work roll. rolling machine.