JPS6348601B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling apparatus capable of producing products with good shapes.

Reducing the rolling load generated during strip rolling has many advantages, such as downsizing the rolling mill, reducing operating costs due to reduced roll wear, and making it easier to roll high-strength materials. As shown in the figure, wrap strip a around rolls b and c,
A variable speed rolling mill that performs rolling at points d and e by matching the speeds of strip a and rolls b and c has been developed and is already well known.

When rolling is performed using such a rolling mill, the direction of the frictional force acting on the contact arc d⌒ of roll b and the direction of the frictional force acting on the contact arc d⌒ of roll b,
The direction of the frictional force acting on the contact arc eg⌒ is reversed, and the frictional force in the opposite direction acts on the upper and lower sides of the strip a, resulting in an increase in rolling force due to the effect of friction, that is, a friction hill.
is eliminated, and the rolling force is significantly reduced compared to normal rolling where the upper and lower rolls have the same circumferential speed. Furthermore, in order to stably achieve the rolling conditions as described above, it is desirable that the winding angles θb and θc of the strip a around the rolls b and c be as large as possible.

As shown in Fig. 2, the effect of the winding angles θb and θc is, for example, when the roll gap changes in the strip width direction due to bending deformation of rolls b and c due to rolling force, the strip The tension distribution in the width direction changes, and the elongation rate remains constant within a certain range regardless of the size of the roll gap, so it has the effect of giving uniform elongation in the width direction of the plate and correcting its shape.

The value of the tension that can change at this time is determined by roll b
If the side is Δt _b and the roll C side is Δt _c , then t ₀ −t ₀ e ^- 〓〓 ^b ≦Δt _b ≦t ₀ e〓〓 ^b −t ₀ ...Formula (i) t ₁ −t ₁ e ^- 〓〓 ^c ≦Δt _c ≦t ₁ e〓〓 ^c −t ₁ ...Formula (ii) μ; Friction coefficient between roll and strip θb; Wrapping angle θc of roll (b); Wrapping of roll (c) Angle t ₀ ; entry tension t ₁ ; exit tension. Therefore, the larger the winding angles θb and θc, the larger the possible range of the variable tensions Δt _b and Δt _c , and the greater the shape modification effect.

For this reason, such rolling mills require relatively narrow widths (e.g.
When rolling a strip with a width of 200 to 300 mm or less, no problem occurs, but as shown in Figure 3, when rolling a relatively wide strip a (for example, 1000 mm or more), the rolling force causes considerable deformation in roll r. Also, as shown in Fig. 4, roll r undergoes deformation due to thermal expansion and load during rolling, and the tension distribution in the width direction of the strip can no longer be corrected, resulting in a strip with good flatness and good shape. could not be rolled.

On the other hand, the entry tension t ₀ also has the effect of reducing the entry tension tb at the roll bite part in the range tb=t ₀ e ^- 〓〓<t ₀ by winding the strip around the roll b. This occurs when the rolling load is large relative to the elongation rate, but if a poorly shaped strip is wound around the roll on the entry side, the strip will not come into contact with the roll in some areas in the width direction, resulting in local Sagging occurs. This results in extreme tension nonuniformity in the width direction, which further deteriorates the shape of the strip during rolling, and may cause meandering of the strip, which in turn may cause so-called narrowing of the strip.

Furthermore, if rolls a and b in FIG. 1 are made smaller in diameter and backing rolls are installed above and below them, the strip will be rolled between the backing rolls and therefore, no backing rolls are generally provided. Therefore, rolls a and b need to have a large diameter to prevent bending.
This resulted in an increase in rolling force and torque.

The present invention aims to save power consumption by improving the shape of the strip and reducing the rolling force.
Moreover, it was designed to allow roll bending to be applied easily and to prevent condensation of the strip.The strip is directly supported by the backing roll or is attached to the backing roll via an intermediate roll. A small diameter roll to be supported, and a stripping device disposed on the side opposite to the backing roll or opposite to the intermediate roll of the small diameter roll, and driven at a different circumferential speed from the small diameter roll, and cooperating with the small diameter roll to strip the strip. a large-diameter roll for rolling the strip; and a base end pivoted on the downstream side in the strip traveling direction of the large-diameter roll and the small-diameter roll so as to be able to swing in a vertical plane parallel to the strip traveling direction. The strip is rolled in the direction in which the strip travels, and the strip is passed through a rolling section formed between the small-diameter roll and the large-diameter roll. It is characterized in that a roll for wrapping the large diameter roll at a required wrapping angle is provided on the downstream side of the section, and a small diameter roll is supported directly on the backing roll or supported on the backing roll via an intermediate roll. a roll, and a large diameter roll which is disposed on the backing roll side or the intermediate roll side of the small diameter roll and is driven at a different circumferential speed from the small diameter roll and rolls the strip in cooperation with the small diameter roll. A vertical line passing through the rotation centers of the large-diameter roll and the small-diameter roll, and parallel to the strip traveling direction with the rotation center near the position where the large-diameter roll and the small-diameter roll face each other. A rotary guide that can rotate in a plane, and a strip that is pivotally supported on the rotary guide in parallel with the rolls and passed through a rolling section formed between the small diameter roll and the large diameter roll, The present invention is characterized in that a deflector roll is provided on the downstream side of the rolling section in the direction in which the strip travels, for wrapping the strip around the large-diameter roll at a required winding angle.

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

FIG. 5 shows a first embodiment of the present invention, in which 1 is a rolling mill housing, 2 is a small-diameter roll that is fitted into a housing window so as to be able to rise and fall freely, and is pivotally connected to a roll shaft box 3 so as to be freely drivable; is a similar roll axle box 5
A large-diameter roll 6 is pivotally connected to a roll shaft box 7 for backing up the roll 2, 8 and 8' are fluid pressure cylinders 9,
9' is pivotally connected to arms 10, 10' which can swing in a vertical plane parallel to the direction of strip travel, and the strip s is rolled onto the roll 4 on the downstream side of the roll bit part (rolling part) formed by the rolls 2, 4. 11 is a reduction cylinder, 12 is a reduction screw, 13 and 14 are hydraulic piston devices, and 15 is a deflector roll disposed on the downstream side of the rolling mill.

When the strip s is wound around a large diameter roll 4 and rolled, the rods of the hydraulic cylinders 9 and 9' are moved back to position the rolls 8 and 8' on the pass line, and the strip s is rolled on the upper part of the roll 8 and rolled. Between 2 and 4, upper part of roll 8', deflector roll 1
5, and by rotating the roll 8' on the downstream side of the rolling mill above the roll 4 by means of a hydraulic cylinder 9', the strip s is approximately attached to the roll 4.
It is rolled at an angle of 180 degrees or more and rolled by driving the rolls 2 and 4 at different circumferential speeds. When the strip s is wound on the entry side of the roll bit part (rolling part), the tension tb of the strip on the entry side of the rolling part varies between t ₀ e〓〓 and _{t 0} e ^- 〓〓, and t ₀ e ^- 〓
In the case of 〓, the tension decreases on the input side of the strip, so that the shape of the strip is not flattened but meandered, so there is a risk of so-called squeezing (a phenomenon in which strips are rolled overlapping each other). However, in the present invention, since the strip on the entry side of the roll bit part (rolling part) is not wound around the roll 2, the tension applied to the strip is not reduced, and even a strip with a bad shape can maintain the tension. As a result, the shape of the strip is flattened, and there is no risk of constriction.
Moreover, the pressing force between the rolls 8' and 4 is smaller than the force required for rolling, and the strip s is not rolled, but the strip s is rolled by the roll 8'.
If the pressing force of is p', the strip tension T of the roll bit part (rolled part) is T=(T ₁ +p'μ)e〓〓...Equation (iii).

T ₁ ; Exit side tension μ : Coefficient of friction between roll 4 and strip θ : Winding angle of roll 4 From this equation, by winding strip s around roll 4 and applying force p', the tension of strip s can be increased. I know it's going to be expensive. Further, the roll 2 without the strip wound thereon has a smaller diameter than the roll 4 with the strip wound around it. It may be considered that the rolling load is approximately proportional to the diameter of the rolling roll. The average roll diameter in this case: _DM is 2/ _DM = 1/D ₄ + 1/D ₂ , where D ₄ : diameter of roll 4 D ₂ : diameter of roll 2, and D ₂ < _DM < D ₄ becomes. Therefore, if the roll diameter of a conventional rolling mill that wraps the strip around the upper and lower rolls is the same as D ₄ , the rolling load will be lower by the amount that the average roll diameter is smaller than the rolling load, and the roll torque will also be lower. . Therefore, rolling can be performed with a small rolling force, and if the rolling force is the same as when the strip is not wound, a large rolling reduction or elongation can be obtained.

When the strip s is rolled in the opposite direction to that shown in FIG. Wrap from the opposite direction to that shown in the figure.

When replacing the rolls, lower both rolls 8 and 8' to the pass line, keep the strip s in a straight line passing between rolls 2 and 4, and move each roll together with the axle box in a direction perpendicular to the plane of the paper in Figure 5. Move and replace.

In FIG. 5, rolls 2 and 4 are being driven. As for the rolling method, the circumferential speed of roll 2 is made to match the speed on the strip inlet side and the circumferential speed of roll 4 is made to match the circumferential speed on the strip exit side;
The peripheral speed of the roll 2 is made to match the speed on the strip entry side, and the peripheral speed of the roll 2 is made to match the speed on the strip exit side.

FIG. 6 shows a second embodiment of the present invention, which differs from the previous embodiment in that a roll shaft box 17 is rotatably mounted between the rolls 2 and 6 and fitted into the housing window so as to be able to move up and down. This is the point in which the intermediate roll 16 is disposed. 18 in the figure is a hydraulic piston device;
19 indicates a deflector roll. Even with such a configuration, rolling similar to that of the rolling apparatus shown in FIG. 5 can be performed. In the case of this embodiment, the strip can be passed straight between the roll 2 and the intermediate roll 16 and used as a conventional four-high rolling mill.

FIG. 7 shows a third embodiment of the present invention, in which the small diameter roll 2' is made smaller in diameter than the roll 2 of the first embodiment or the second embodiment, and is idled, and the intermediate roll 2' is
0 via the backup roll 21. Since the diameter of the roll 2 is further reduced, the rolling force is further reduced and shape control becomes easier. Therefore, it is possible to roll special steels such as stainless steel, silicon steel, and titanium steel, and difficult-to-process materials such as extremely thin plates and foils.

FIGS. 8 and 9 show a fourth embodiment of the present invention, in which the center of rotation is on a line passing through a large-diameter roll 4 and a small-diameter roll 2, and near the position where the rolls 2 and 4 face each other, and the strip progresses. A rotary guide 22 that can rotate in a vertical plane parallel to the direction is supported by a support roll 23, and a gear 2 that can be rotated by a drive device (not shown).
4 is engaged with a gear portion of a rotary guide 22, and a rotatable deflector roll 25 is disposed at a required position of the rotary guide 22.

When the strip s is rolled around a large diameter roll 4, the rotary guide 22 is rotated to position the deflector roll 25 at the solid line position in FIG.
upper surface, between rolls 2 and 4, deflector roll 25
The upper surface passes through the lower surface of the deflector roll 15, and the rotary guide 22 is rotated clockwise in FIG. 9 to move the deflector roll 25 from the position indicated by the two-dot chain line to the rear upper part of the roll 4 as shown in FIG. By positioning the strip s, the strip s is wrapped around the roll 4 at a wrapping angle of approximately 180 degrees or more,
Rolling is performed by driving the rolls 2 and 4 so that their circumferential speeds are different.

When rolling the strip s while advancing it in the direction opposite to that shown in FIG. 8, the deflector roll 25 is rotated counterclockwise together with the rotary guide 22 from the solid line position in FIG. The strip s is wound around the roll 4 in the opposite direction to that shown in FIG. Also, when changing the rolls, the work is carried out with the deflector roll 25 positioned at the solid line position in FIG. 9.

10 and 11 show a fifth embodiment of the present invention, in which two sets of deflector rolls 25, 25' are attached to a rotary guide 22. In this embodiment, during rolling, the strip s wound around the roll 4 changes direction by the deflector roll 25 and advances upward. Further, when threading or changing the rolls, the strip s is in a horizontal state between the rolls 2 and 4, as shown in FIG. 11, and is guided diagonally upward by the deflector roll 25'.

FIG. 12 shows a sixth embodiment of the present invention with rolls 4 and 6.
This is an example in which a small diameter roll 2' disposed between the rollers is made smaller in diameter than the roll 2, so that the rolls 4 and 6 can be driven.

The strip s passes, for example, over a deflector roll 19 and is passed between rolls 2' and 4.
It is wrapped at a wrapping angle of approximately 180 degrees or more,
The direction is changed by deflector rolls 25, 25', and 15, and the material is sent to a subsequent process.

During reverse rolling, the rotary guide 22, which is located at the position shown in FIG. 12, is rotated one turn counterclockwise from the state shown in FIG. To,
Also, the deflector roll 25 is positioned at the position of the deflector roll 25' shown by the solid line in FIG. This causes the strip s to be the first
It is wound in a state opposite to that shown in Figure 2.

When changing the rolls, rotate the rotary guide 22 and move the deflector rolls 25, 25' to the first position.
At the same time, the strip s is placed in the position indicated by the two-dot chain line B in FIG. Like the roll 2' shown in FIG. 7, the roll 2' has a smaller diameter than the other rolls 2, so the rolling force can be small and the shape can be easily controlled.

FIG. 13 shows a seventh embodiment of the present invention, in which an intermediate roll 16 rotatably pivoted to a roll shaft box 17 is interposed between the roll 2 and the backing roll 6. Even with such a configuration, rolling similar to that of the rolling apparatus shown in FIG. 10 can be performed.

In the embodiment of the present invention, the same reference numerals are given to the same parts in FIGS. 5 to 13.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but the arms, rolls, etc. are removed from the embodiments shown in FIGS. 6 and 7, and a deflector roll is provided, as shown in FIGS. It goes without saying that the present invention can be implemented even if a rotary guide is provided, and that various other changes can be made without departing from the gist of the present invention.

Further, in the above embodiments, an example was described in which the strip was not wound around the small diameter roll at all. However, depending on the angle of incidence of the strip, the strip may be wound around a small diameter roll, but since the winding angle is relatively small, it has little effect on increasing or decreasing the tension.

According to the rolling device of the present invention, it is possible to obtain a large rolling reduction ratio, the shape of the strip can be easily controlled, and the rolling force can be reduced, so power consumption can be reduced, and the rolling section Since the strip on the entry side is hardly wound around the roll, the tension on the entry side is not reduced, so the strip does not loosen and lose its shape, and so-called narrowing of the strip is prevented, etc. Various excellent effects can be achieved.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional variable speed rolling mill, Fig. 2 is a perspective view showing changes in rolling force distribution, Fig. 3 is an explanatory diagram showing bending deformation of the roll, and Fig. 4 is a diagram showing the thermal crown of the roll. 5 is an explanatory diagram of the first embodiment of the rolling mill of the present invention, FIG. 6 is an explanatory diagram of the second embodiment, FIG. 7 is an explanatory diagram of the third embodiment, and FIG. The figure is an explanatory diagram of the fourth embodiment, FIG. 9 is an explanatory diagram of the rolling apparatus in FIG. 8 during sheet passing and roll rearrangement,
11 is an explanatory diagram of the fifth embodiment of the rolling apparatus of the present invention, FIG. 11 is an explanatory diagram of the rolling apparatus of FIG. 10 during sheet passing and roll rearrangement, and FIG. FIG. 13 is an explanatory diagram of the seventh embodiment of the rolling apparatus of the present invention. In the figure, 1 is a rolling mill housing, 2 and 2' are small diameter rolls, 4 is a large diameter roll, 6 is a backing roll, 8,
8' is a roll, 9, 9' is a fluid pressure cylinder, 10,
10' is an arm, 15, 19, 25, 25' are deflector rolls, 16, 20 are intermediate rolls, 21 is a backing roll, 22 is a rotary guide, and 23 is a support roll.

Claims (1)

[Scope of Claims] 1. A small-diameter roll that is directly supported by the backing roll or supported by the backing roll via an intermediate roll, and a small-diameter roll that is disposed on the opposite backing roll side or the opposite intermediate roll side of the small diameter roll. and a large-diameter roll that is driven at a different circumferential speed from the small-diameter roll and rolls the strip in cooperation with the small-diameter roll, and a roll downstream of the large-diameter roll and the small-diameter roll in the strip traveling direction. an arm whose base end is pivoted on the side and is capable of swinging in a vertical plane parallel to the direction in which the strip travels; A roll is provided for winding the strip passed through a rolling section formed between the roll and the large diameter roll at a required winding angle on the downstream side of the rolling section with respect to the direction in which the strip travels. rolling equipment. 2. A small-diameter roll that is directly supported by the backing roll or supported by the backing roll via an intermediate roll, and a small-diameter roll that is disposed on the opposite backing roll side or the opposite intermediate roll side of the small diameter roll, and is a large-diameter roll that is driven at different peripheral speeds and rolls the strip in cooperation with the small-diameter roll, and a line passing through the rotation centers of the large-diameter roll and the small-diameter roll and a rotary guide capable of rotating in a vertical plane parallel to the strip traveling direction with a rotation center near a position where the roll and a small-diameter roll face each other; A deflector roll for winding the strip passed through the rolling section formed between the roll and the large diameter roll at a required wrapping angle on the downstream side of the rolling section with respect to the strip traveling direction. A rolling device characterized by being provided with.