JPH0455004A - Cross roll rolling mill - Google Patents

Abstract

PURPOSE:To remarkably decrease the wear and the fouling of the slide surface and to remarkably reduce the rolling friction coefficient by setting the axis of a roller so as to pass through the turning center of a roll chock. CONSTITUTION:A frictional resistance decreasing device 27 is formed by positioning plural cylindrical rollers 9 between the upper race 8a installed in a roll chock 13b and the lower race 8b installed in an equalizer beam 16. These plural rollers 9 are placed, respectively so that its axial direction extends radially centering around the turning center of the roll chock, that is, the roll rotation center '0' of crossed rolls. As a result, wear and fouling of the slide surface are decreased, and also, the rolling friction coefficient is also improved remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION <Public Expenses for Industrial Use> The present invention relates to a cross roll rolling mill used for rolling steel plates and the like.

<Prior Art> In recent years, the required precision for the dimensions of rolled products (rolled steel plates, etc.), especially the thickness in the width direction of the plate, has become extremely high. Therefore, in order to cancel the roll deflection due to the rolling load, it has been conventionally practiced to use a so-called crown roll in which a work roll is provided with an initial crown (usually a convex quadratic curve shape).

However, when the hardness, plate width, plate thickness, etc. of the rolled material differ, the degree of deflection changes, so that it has not been possible to perform good rolling with a single crown roll. That is, it was necessary to prepare a large number of crown rolls with different shapes, and then to temporarily stop the rolling mill and rearrange the crown rolls. In this case, the operating rate of the rolling mill decreases, resulting in an increase in manufacturing costs.

On the other hand, when the rolling operation is performed continuously, the crown shape changes significantly due to a combination of abrasion and thermal expansion of the work roll surface, resulting in a drawback that the rolling precision is significantly reduced.

Therefore, a cross-roll type rolling mill has been proposed for the purpose of eliminating the need to rearrange the rolls, improving the thickness accuracy of the rolled product in the width direction, and extending the wear life of the rolls.

This is a roll in which an upper roll (upper work roll, upper back-up roll, etc.) and a lower roll (lower work roll, lower back-up roll, etc.) are crossed at a required angle to the direction perpendicular to the rolling direction in a horizontal plane. It is.

FIG. 10 shows a schematic basic configuration of a cross roll mechanism of a four-high rolling mill as an example. An upper work roll backing chock 3a is supported on an upper backup roll roll chock 3b located on the upper side of the housing 1 and connected to the rolling down device 1a, and the upper work roll 2a is supported on these upper roll chocks 3a, 3b. , an upper backup roll 2b is supported. Also, on the lower side inside the housing 1, there is a roll chock 13 for the lower backup roll.
There is a lower workpiece 4 on this roll chic 13b.
A roll chuck 13a for the roll is supported, and the upper work roll 2a,
A lower work roll 12a faces the upper backup roll 2b.

A lower back up roll 12b is supported. On the upper and lower sides of the housing 1, pedestals 4a, 4b, 14m,
14b is provided, and these pedestals 4m, 4b, 14m,
14b has a roll check 3b for backup roll.
.

5g, 5c, 15b that engages with 13b.

15d and roll chucks 3a and 13 for work rolls.
The screws 5b and 5d engage with m.

15m and 15c are provided.

Therefore, the intersection with the axis perpendicular to the rolling direction is 3 m, 3 b, 13 m, and a pedestal 4 m for directly or indirectly attaching the roll nut 13 b to the housing 1.
, 4b, 14m, 14b and operated by an electric motor (not shown), 5m, 5b, 5c
, 5d and aryki ISm.

15 b, 15 c, and 15 d, horizontally move the roll chock 3 m, 3 b and the roll chuck W 13 m, 13 b in opposite directions, respectively, and move the upper roll 2 m, 2
b and lower 0-rules 12m and 12b were to be rotated in opposite directions around the vertical axis.

On the other hand, a top equalizer beam 6 is provided above the roll chock 3b, and a bottom equalizer beam 16 is provided below the roll chock 13b, each positioned within the window of the housing 1. Therefore, the jacks 5m, 5b, 5c, 5d and the jack 15a.

15 b, 15 c, and 15 d, respectively, and the upper 0-rules 2 m, 2 b and the lower 0-71, 12 m, 12
When giving a cross angle to b, between the roll chock 3b and the top equalizer beam 6 and the roll chock 13b
A relative sliding movement occurs between the bottom equalizer beam 16 and the bottom equalizer beam 16.

In the case of a cross-roll rolling mill without an equalizer beam, horizontal sliding motion occurs between the roll chock and the housing or between the roll chock and the rolling device.

When the roll crossing operation is performed before the start of rolling, the vertical load applied to the lower sliding surface is lower mouth - 412 m, 12
b and rollna 1 hook 13a.

13b, and the vertical load applied to the upper sliding surface is an overbalance load caused by a roll lifting device (not shown). Since these vertical loads are not very large, it is not very difficult to make the roll chock slide horizontally due to roll crossing.

However, during rolling, roll ch1. ri3b.

A large rolling load is applied between each equalizer beam 13b and each equalizer beam 6.16, and in order to change the roll intersection angle, the width direction thickness distribution variation of the strip W is detected and the amount of variation is adjusted. Accordingly, the change must be made against the large frictional resistance generated by the rolling load, requiring complicated and precise operations.

In addition, as a solution to the above problem, a method has already been proposed in which frictional resistance reducing devices 7, 17 are inserted between the roll chocks 3b, 13b and each equalizer beam 6.16 in order to easily change the roll intersection angle. Proposed.

A side cross section of this frictional resistance reducing device 17 is shown in FIG. 5, and FIG. 11 shows a view taken along the line A--A in FIG. 5 showing the planar arrangement of the rollers. As shown in these figures, the roll chuck 13
There is a race of 8m between b and equalizer beam 16.

A plurality of cylindrical or rod-shaped rollers 29 are arranged in parallel through the rollers 8b, and arranged in two rows such that the upper row and lower row are equally spaced i,=t. There is.

Furthermore, since the frictional resistance reducing device 7 also has the same configuration as that described above, a description thereof will be omitted.

<Invention tries to solve! 1ml> However, as shown in Fig. 11, in the conventional frictional resistance reducing device, when the roll is turned around the 0 point, the rolling direction of the rollers 29 (velocity vector = V) and the turning direction of the upper race 8a ( Since the velocity vector=v1) increases, the rollers 29 located at the ends of the array experience a large axial slip (velocity vector=v3). Therefore, due to this slippage, there has been a problem that the performance of the bearing of the frictional resistance reducing device is deteriorated, such as a decrease in wear resistance and seizure resistance and an increase in the rolling friction coefficient.

Means for Solving the Problems> In the first cross-roll rolling machine according to the present invention, the roll chocks that support the upper and lower rolls are rotated relative to the housing to adjust the intersection angle of the upper and lower rolls, respectively!
In a cross-roll rolling mill capable of adjusting the IN position, the roll chock is installed between the roll chock and an e-fraise beam of the housing that slidably supports the roll chock while receiving a rolling reaction force transmitted from the roll chock. It is characterized in that the axis of the accelerator is set to pass through the center of rotation of the rotation motion.

A cross-roll rolling mill according to a second aspect of the present invention is a cross-roll rolling mill in which the crossing angles of the upper and lower rolls can be adjusted by rotating the roll chucks supporting the upper and lower rolls with respect to the housing. A roller installed between a rollner hook and an equalizer beam of the housing that slidably supports the roll chuck while receiving a rolling reaction force transmitted from the roll chuck,
The equalizer beam is held by a holder having an arc-shaped end face centered on the rotation center of the net rotation, and a side end of the equalizer beam facing this end face slidably supports the holder. That is.

Function> When adjusting the crossing angle of the upper and lower rolls, the rollers rotate while receiving rolling reaction force, and the roll chock rotates relative to the housing. As a result, the roll supported by the roll chock rotates and its angle is adjusted.

At this time, since the axis of the roller is set to pass through the center of rotation, the roller does not slip in the axial direction, and the frictional force can be reduced.

Also, when adjusting the intersection angle of the upper and lower rolls,
Since the arc-shaped end surface formed on the cage that holds the rollers slides in contact with the side end of the equalizer beam, the cage rotates around the center of rotation. As a result, the rollers rotate smoothly and frictional force is reduced.

<X! Example> The first claim of the first claim relating to the cross roll rolling mill of the present invention
An example is shown in FIG. 1, FIG. 2, and FIG. 5, and the present example will be explained based on these figures.

The same members as those shown in the prior art are given the same reference numerals, and redundant explanations will be omitted.

As shown in FIG. 1, which is a cross section taken along line A-A in FIG. , a plurality of cylindrical rollers 9 (a,=b as shown in FIG. 2) are positioned between the lower race 8b installed on the equalizer beam 16. The plurality of rollers 9 are arranged so that their axial directions extend in a radial manner about the rotation center of the roll chock, that is, the roll rotation center 0 of the crossed rolls.

According to this embodiment, since the respective rollers 9 are arranged radially with respect to the roll rotation center 0, the slippage in the axial direction of the end rollers that occurs in the case of parallel arrangement as shown in FIG. 11 is eliminated. . As a result, wear and seizure of the sliding surfaces are reduced, and the rolling friction coefficient is also greatly improved.

In this embodiment, the rollers 9 are arranged in two rows, but one
The rollers 9 may be arranged in rows or other multiple rows, and the number of rollers 9 is not limited to the number shown in FIG. In addition, the radiation angle θ representing the interval of each flow 9,
The value of is not particularly limited.

Furthermore, the jlI friction resistance reducing device 27 described above
A similar configuration can be installed between the roll chock 3b and the equalizer beam 6. Moreover, the shape of the roller 9 may be rod-like.

Next, the second embodiment of the first claim is shown in FIGS. 3 and 4.
5 and 5, and the present embodiment will be explained based on these figures.

The same members as those shown in the prior art and the first embodiment are given the same reference numerals, and redundant explanations will be omitted.

As shown in FIG. 3, which is a cross section taken along line AA in FIG. 5, the frictional resistance reducing device 37 inserted into the same machine as the first embodiment has rollers 19 arranged at a radiation angle θ2. The roller 19 has different diameters on the upper end side and the lower end side, and is formed into a substantially conical shape such that the lower diameter b2 is smaller than the upper end diameter a2.

Therefore, according to this embodiment, the respective rollers 19 are arranged so that the axial direction extends radially around the roll rotation center O, and the rollers 19 are formed in a substantially conical shape. Therefore, it becomes easier to roll in an arc shape centered on the roll rotation center 0, and as a result, the posture of the roller 19 during sliding becomes stable, and the cylindrical roller 9 of the first embodiment
As described above, wear and seizure of the sliding surfaces are reduced, the rolling friction coefficient is improved, and the performance of the bearing is improved.

It should be noted that the cone angle θ3 representing the apex angle of the roller 19 (it is not particularly limited and may be changed arbitrarily), and the number, arrangement, and radiation angle θ of the rollers are also set to a specific quantity as in the first embodiment. , but is not limited to the value.

Next, a first embodiment of the second claim of the present invention is shown in FIGS. 6 and 7, and this embodiment will be described based on these figures.

Note that the same members as those described in the description of the prior art and the first claim are given the same reference numerals, and redundant explanation will be omitted.

Similar to the first claim, a plurality of cylindrical rollers 9 are arranged radially and are held.

As shown in FIG. 7, the roller 9 held by the holder 10 is located between the roll chink 13b and the equalizer beam 16 via the upper race 8a and the lower race 8b.

As shown in FIG. 6, both end surfaces 10a of the cage 10,
10b is formed in an arc shape so as to match the locus centered on the roll rotation center, and both end surfaces 10a,
Similarly to 10b, the equalizer beam 16 [f416a] follows the trajectory centered on the roll rotation center in an arc shape.

16b is formed. In other words, equalizer beam 1
6, the retainer 1110 is pivotably engaged.

Therefore, according to this embodiment, the rollers 9 are arranged radially on the holder 10, and the holder 10 is installed so as to be rotatable about the roll rotation center, which is the central axis of the radiation. When the retainer 10 receives a rotational force in the direction indicated by the arrow in FIG. This further improves performance.

In this embodiment, the same effect can be obtained even if a substantially conical roller 19 is used instead of the roller 9, and there is also a gap between the roll chute 3b and the equalizer beam 6. It is possible to install a holding Mlo etc. with a similar configuration.

Next, a second embodiment of the second claim is shown in FIGS. 8 and 9, and this embodiment will be described based on these figures.

It should be noted that the prior art, the first claim, and the first of the second claims
The same members as those shown in the embodiments are given the same reference numerals, and redundant explanations will be omitted.

This embodiment, like the first embodiment of the present claim described above,
Both inner and outer end surfaces 20 a and 20 b of the holding @ 20 are formed in an arc shape according to the locus centered on the roll rotation center.
and the side ends 16c, 16d of the equalizer beam 16
A plurality of rollers 21 are distributed between each
This roller 21 is on the side #416c of the equalizer beam 16.

It is held by a holder 22.23 installed and supported at 16d.

Therefore, according to this embodiment, both end surfaces 20 m, 20
Since a plurality of rollers 21 are arranged between the rollers 16-b and the side ends 16-c and 16d, the cage 20 receives a rotational force in the direction of the arrow shown in FIG. 8 when the rolls are crossed. The retainer 20 is attached to the side ends 16c and 16d of the equalizer beam 16.
The performance of the entire frictional resistance reducing device 57 as a bearing is improved because it is guided by the rollers 21 to perform accurate and smooth arcuate motion, and the rolling friction coefficient is greatly reduced by the action of the rollers 21. will improve dramatically.

In this embodiment, the rollers 21 held by the cages 22 and 23 may be balls instead of rollers, and a similar structure may be adopted between the roll chinks 3b and the equalizer beams 6. can.

<Effects of the Invention> According to the cross roll rolling mill according to the first claim of the present invention, the axis of the rollers is set to pass through the center of rotation of the roll chink, and as a result, when the rollers are arranged in parallel, There is no axial sliding of the rolling rollers, the wear and seizure of the sliding surfaces are greatly reduced, and the rolling friction coefficient is greatly reduced.

In this case, if the shape of the roller is approximately conical, the posture of the roller is always stable when the roller rotates and slides.

According to the cross-roll rolling mill according to the second aspect of the present invention, the end face shape of the cage that holds the rollers is made into an arc shape centered on the turning center of the roll chink. The device also rotates while being supported by the equalizer beam around the center of rotation of the roll chink, allowing accurate and smooth rotation.

At this time, by installing a sliding member such as a ball or a ball between the holding sound and the equalizer beam, it is possible to further reduce the frictional resistance, and the performance as a bearing is greatly improved. improves.

[Brief explanation of the drawing]

FIG. 1 is a view along arrow A-A in FIG. 5 showing a first embodiment of the first claim of the cross-roll rolling mill of the present invention, and FIG. 2 is an enlarged view of the rollers used in FIG. 1. , the third @ is also the first
Fig. 5 is an enlarged view of the roller used in Fig. 3, and Fig. 5 is the first claim of the present invention. and FIG. 6 is a side view of a frictional resistance reducing device according to the prior art, and FIG. 7 is a plan view of a frictional resistance reducing device representing the first embodiment of the second claim of the cross-roll rolling mill of the present invention. 6 is a view taken along the line C-C in FIG. 6, FIG. 8 is a plan view of the frictional resistance reducing device representing the second embodiment of the second claim of WR, and FIG. 9 is a view taken along the line D-D in FIG. visual view,
FIG. 10 is a front view showing the basic configuration of a cross-roll rolling mill, and FIG. 11 is a view taken along the line A--A in FIG. 5 showing a frictional resistance reducing device according to the prior art. l is +7 gearing, 2m, 2b, 12m, 12b roll, 3 m, 3 b, 13 m, 13 b is roll chock, 6.16 is equalizer beam, 7° 17.
27, 37, 47, 57 are frictional resistance reducing devices, 9, 19
, 21, 29 are rollers, 10, 20 are hold-1a, , b,
is the outer diameter of the roller, a is the upper end diameter of the conical roller, b2 is the lower end diameter of the conical roller, 0 is the center of rotation of the roll, θ1. θ2Lt
It is the radiation angle.

Claims (2)

[Claims] (1) In a cross-roll rolling mill in which the crossing angles of the upper and lower rolls can be adjusted by rotating roll chocks that support the upper and lower rolls with respect to the housing,
The axis of a roller installed between the roll chock and an equalizer beam of the housing that slidably supports the roll chock while receiving a rolling reaction force transmitted from the roll chock passes through the center of rotation of the rotation movement. A cross-roll rolling mill characterized in that it is set to (2) In a cross-roll rolling mill in which the crossing angles of the upper and lower rolls can be adjusted by rotating roll chocks that support the upper and lower rolls with respect to the housing,
A roller installed between the roll chock and an equalizer beam of the housing that slidably supports the roll chock while receiving a rolling reaction force transmitted from the roll chock is centered on the center of rotation of the swing motion. A cross-roll rolling mill characterized in that the equalizer beam is held by a cage having an arcuate end face, and a side end of the equalizer beam facing the end face slidably supports the cage.