JPS5838601A - Cross roll type rolling mill - Google Patents

Abstract

PURPOSE:To eliminate the adverse influence of thrust forces in a screw-down direction and to support thrust forces uniformly by providing wheels at the front and rear in the rolling direction of roll chocks to both end parts of supporting arms which are mounted freely horizontally turnably in central parts. CONSTITUTION:A crossing angle theta is given to work rolls 1 via roll chocks 2 abutting to pusher bars 6 guided by the guides 5 of housing 4 by the forward and backward movements of said bars. Then the thrust force T generated in the rolls 1 is transmitted from the supporting parts 2a, 2b of the chocks 2 to supporting arms 8 via pin joins 11 in the central part. Further said force is supported by the clamping plates 13 forming guiding grooves 15 mounted to the housing 4 from wheels 10 via automatic self-aligning roller bearings 9 in both end parts of the arms 8. Then the chocks 2 are supported by the wheels 10 and the friction state thereof is made into rolling friction, whereby the influence that the frictional force generated by the force T gives upon screw-down forces is decreased. Since both wheels 10 are maintained parallel by the arms 8 and the bearings 9 with respect to the plates 13, the force T at both wheels is made uniform.

Description

[Detailed Description of the Invention] The present invention eliminates the adverse effects of thrust force acting on the roll.
B is removed or rolled into a system mist rolling mill.

In recent years, a method has been developed for controlling the thickness distribution of rolled products in the [@ direction] by crossing the upper and lower work rolls and backup rolls to roll the material to be rolled. Various types of rolling mills have also been proposed.

In a cross roll type rolling mill, rolling is performed by crossing the upper and lower roll groups at a required cross angle θ. Since the traveling direction vs differs by the amount equivalent to the cross angle, a shift occurs in the axial direction vT, and upper work rule 02
Thrust force acts on Similarly, thrust forces of equal magnitude and opposite direction act on the lower work rule 03.

Comparing this thrust force with a conventional rolling mill, in which the upper and lower q-les are parallel and the stomach angle is 00, it is found that the conventional rolling mill has a cross angle of 0, so the axial Theoretically, when rolling in the direction Vyo, no thrust force is generated without groaning, but in actual O rolling, a slight thrust force T is generated.

The value is about 1 to S- of the rolling blade P. After a while,
The frictional force F in the direction of the rolling force due to the thrust force TK is so small that it can be ignored.

This frictional force F supports the workpiece four. - Friction coefficient of the sliding part in the front and back of the rolling direction of the rolling direction, t) Since it is friction, if ^ = 0.1 to 0.2 and 1, the following formula (1
) is given by

To F Fuji・T ■(0,001~0.003)P...-(1) Proceed like this) Since it is friction, the friction coefficient is large, but since the thrust force T is small, the friction force F is also small, The hysteresis of the reduction blade is also small, so it does not affect plate thickness control in any way and does not cause dizziness.

On the other hand, in a roll-less rolling mill, the thrust force T is large and its value is about 4 to 5% of the rolling blade P. This cannot be ignored, and the roll chock is supported via the sliding part. Then, due to the large thrust force T and the Bell friction coefficient, the frictional force F is also large, and this frictional force F affects the rolling blade when the roll moves in the direction of the rolling force, increasing hysteresis. This affects the thickness control of the M, G, and C plates, making it impossible to improve the precision.

In order to improve the influence of this thrust force, it has been proposed to install wheels before and after the rolling direction of the roll chock to create rolling friction, but this is not sufficient. The wheels are not parallel to each other, resulting in relative displacement, resulting in uneven thrust force acting on each wheel.

The object of the present invention is to eliminate such conventional drawbacks, eliminate the influence of thrust force in the direction of rolling force, and provide a cross-roll type rolling mill that can support thrust force equally in the front and back of the rolling direction.

The structure of the present invention that achieves this object is to displace the upper and lower work rolls and backup rolls back and forth in the rolling direction of the field pipes that support them, thereby aligning the center axis of each roll at right angles to the rolling direction in a horizontal plane. 4. In a four-wheel rolling mill, the center part of the support arm extending back and forth in the rolling direction is attached to the outer end of the front arbor so as to be rotatable in a horizontal plane. At the same time, wheels are rotatably attached to both ends of the supporting arm, and a guide formed along the direction of force of the wheel housing is attached so that it can be transferred. Wow.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Figures 2 to 5 show an embodiment of the cross-roll rolling mill of the present invention, Figure 2 is a plan view of the work roll, and Figure 3 is the main roll! Iku's enlarged plan view, Figure 4 is ■- in Figure 3.
■Cross-sectional view along the intermediary, Figure 5 is 3rd! It is a v-■ arrow composition in gl.

Each of the roll chocks 2 provided at the ninth extension supporting the workpiece four wheels 1 in the rolling direction 1'ClAl1
A chock liner 3 having an arcuate surface protruding from the chock liner 3 is attached thereto, and a pusher member s reciprocates while being guided by a pusher guy ks attached to the housing 4 so as to come into contact with the chock liner 3. Jin's Pusha/4-6
B'' 7-tall 1 is given a cross angle of 0 in the horizontal plane with respect to the direction perpendicular to the rolling direction.

The pusher per 6 is connected to a worm jack 7 attached to the housing 4 of the vk inner part of the pusher per 6 to allow reciprocating movement.
The cross angle is set by controlling the position of the pipe. In this case, the pusher pars 6 provided before and after the rolling direction move in the opposite direction by the same amount of movement, and the state in which the chock liner 3 is held between them is maintained.

On the other hand, in order to support the thrust force acting on the water roll l, as shown in the enlarged view, the upper and lower 2W is applied to the outer end of the thrust force acting side of the thrust force 2. , support portions 2m and 2b are formed to protrude toward the external stomach.

A support arm 8 is inserted between 2b, and the center portion of the support arm 8 is attached via a pusher 12t to a binge 11 located in the vertical direction so as to be rotatable in a horizontal plane. A wheel 10 is attached to the front and rear of the support arm 8 in the rolling direction at a symmetrical position with respect to the center of the wheel 1 through a self-aligning roller potion bearing 9. The wheels 10 are formed into an L-shape so that their base ends are rotatably exposed to the outer surface of the pusher guide y5 attached to the housing 4 and the pusher guide 5, and their distal ends are parallel to the pusher guide 95. The guide groove 15 extending in the direction of the rolling force is formed by the inner surface of the clamp plate 13 and can be moved. As shown in FIG. 2, the clamp plate 13 forming the guide groove L5 is opened and closed by a hydraulic cylinder 14 whose base end is attached to the housing 4, so that the work rolls L can be easily rearranged. .

With this configuration, the thrust force T acting on the work roll 1 is transmitted to the support portions 2m, 2 of the roll chock 2.
b to the support arm 8 via the binocular input) 11, and is further transmitted from the wheels lO at both ends of the support arm 80 to the housing 4.
It is supported by a guide groove (ts't-forming clamp derailleur) 13 attached to the guide groove.

Since the roll chock 2 is supported through the wheel 10 tube in this way, the friction condition is the same as the rollers! The frictional force F in the direction of the rolling force is given by the product of the roller friction coefficient All and the thrust force T.

The friction coefficient μ of the roller is smaller than the conventional sliding friction coefficient (w Q, l ~ 0.2), and the
The value is JAB = 0.005 to 0.01,
Even if the thrust force T of the rolling blade P is as large as 4 to 5, the friction force F is small yc as given by the following equation (2).

F-μR-T (0,0002-0.0005)P, ...-(
21 Therefore, the friction force F generated by the thrust force TK, which is smaller than the friction force of the sliding p friction shown by the conventional formula (1), has less influence on the hysteresis of the rolling blade and has a smaller influence on the plate thickness control.

In addition, the thrust force T transmitted to the roll chock 2 is supported by a rotatable support arm 8 via a binge-driven tty, and a wheel lO attached to both ends of the support arm 8 via self-aligning rolling bearings 9t. Therefore, when giving the cross angle # to the work roll 1 by the pusher 8, the roll chock 2 moves in an arc.
Although relative displacement occurs in the rolling direction, that is, on both sides of the work roll l in FIG. Since the wheels 10 are maintained in this state, the thrust forces on the left and right wheels 10 are equalized and balanced.

In the above embodiment, the work roll was explained among the roll groups, but the same thing can be done for the backup roll, and for the work roll that is paired with the disclosed work roll, it can be applied to the opposite end. Needless to say, the rolling bearing to which the wheel IO is attached is preferably a self-aligning type, but a general roller bearing tube can also be used.

As described above in detail with the embodiments, according to the present invention, even in a cross-roll type rolling mill, it is possible to reduce the frictional force in the rolling force direction due to the thrust force acting on the rolls, so that the frictional force in the rolling force direction can be reduced. The hysteresis that affects the roll movement Wt of the blade is reduced, and the AGC1N thickness control is not adversely affected and the plate thickness can be controlled accurately.

Further, the thrust force acting on the a-ru can be evenly supported in the front and back of the rolling direction, supporting the wheel.

Gently, no unreasonable force is applied to the bearing, and the life of the bearing is extended.

[Brief explanation of the drawing]

The Wti diagram is an explanatory diagram of the thrust force acting on the rolling mill in oxttroll type rolling. water p
- Plan view of the main part of the building, Figure 3: Enlarged plan view of the main part of the company, Figure 4
The figure is a sectional view taken along the line Fi'-W in Figure 1113, and Figure S is a view taken along the line v--■ in Figure 3. In the drawing. 1 is a work role. 2 is 1 roll. 2. Crow, 2b is the support part. 4 companies housing. 6 is Pusha Guy P. 6 is pusher par. 8 is the support arm. 9 is a self-aligning roller bearing. lO is a wheel. 11 is a binge joint. ! 3 is a clamp plate, and 1s is a groove. Applicant Mitsubishi Heavy Industries, Ltd. Nippon Seikaku Co., Ltd. Sub-agent Patent Attorney Shibu Mitsuishi (and 1 other person) JP 58-3860! ◆・Su Dai 3 Maro 2 Figure 4 Figure 5

Claims (1)

[Claims] The central axis of each roll is tilted in the horizontal plane with respect to the direction perpendicular to the rolling direction by displacing the coolant rolls that support the upper and lower work rules and backup rolls forward in the rolling direction. In the type rolling mill, the central part of the support arm extending back and forth in the rolling direction is attached to the outer end of the scissors rotary shaft so as to be rotatable in a horizontal plane, and a rotating wheel is attached to both ends of the rotary shears support arm. While the wheels can be freely installed, there are also guides formed along the direction of the rolling force of the wheel. 1 type rolling mill with 4 sprues and 1 special mold which is mounted so that it can roll in the groove.