JP3075378B2 - Cross mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a cross mill in which only upper and lower work rolls are crossed without changing the positions of intermediate rolls and standby rolls. The thrust force generated therebetween can be reduced.

[0002]

2. Description of the Related Art One of the methods for controlling the cross-sectional shape of a rolled product with high precision is a method of slightly crossing upper and lower work rolls to change the gap distribution between the rolls, and has been put to practical use as a so-called cross mill.

In this cross mill, the upper and lower work rolls are crossed in a horizontal plane with their rotation axes inclined in directions opposite to each other with respect to the direction perpendicular to the line.

When such a cross mill is configured as, for example, a four-high rolling mill, when only the upper and lower work rolls are crossed, and the upper and lower holding rolls supporting the work rolls are not crossed and rolled as they are, A thrust force is generated between the work roll and the rolled material, and a large thrust force is generated between the work roll and the holding roll.

For this reason, a strong thrust bearing must be provided at the end of the work roll or the holding roll against the thrust force generated between the rolls and supported by the housing.

[0006]

However, the thrust force between the rolls has a problem that the value itself is considerably large and increases with an increase in the rolling load. An excessively large thrust bearing cannot be provided to support the thrust force.

Therefore, in a conventional cross mill, as shown in a schematic configuration in FIG. 9, upper and lower work rolls 1 and 2 and upper and lower support rolls (retaining rolls and intermediate rolls) for supporting the same.
At present, these support rolls 3 and 4 are also of a pair cross type in which the support rolls 3 and 4 are crossed at the same angle so as to be parallel to the rotation axis of the work rolls 1 and 2 in order to eliminate generation of a thrust force between the support rolls 3 and 4.

For this reason, in addition to the work rolls 1 and 2, a cross mechanism for supporting rolls 3 and 4 (pre-rolls and intermediate rolls) for supporting the work rolls 1 and 2 is required, and the structure of the cross mill becomes complicated. There is.

The present invention has been made in view of the above-mentioned problems of the prior art. Even when only the upper and lower work rolls are crossed, a large thrust force is not generated between the rolls and a supporting roll such as a standby roll or an intermediate roll. It is intended to provide a cross mill that can be used.

[0010]

SUMMARY OF THE INVENTION In order to solve the problems of the prior art, a cross mill according to the present invention is a cross mill in which only upper and lower work rolls cross each other in a horizontal plane. Provide a lubricant supply device that supplies a lubricant between the intermediate roll and the standby roll to reduce frictional force and reduce inter-roll thrust force, and the intermediate roll or the standby roll
While the brake device is provided, the work roll
Or the operation of the brake device is controlled by a stop signal.
A control device is provided .

[0011]

[0012] In addition, Kurosumiru of the present invention, the upper and lower word
Cloth that allows only crawls to cross each other in a horizontal plane
In a mill, the work roll and the work roll
Lubricate between the intermediate or supporting roll that supports
Supply to reduce friction force and reduce thrust force between rolls
That a lubricant supply device is provided, the cross angle changing device for changing the cross angle of the Kurosumiru, a cross angle command unit for commanding the cross angle to the cross angle change device, according to the cross angle of the cross angle command device The lubricant supply device further includes a lubrication amount command device that outputs a command to increase or decrease the lubricant supply amount.

[0013] In addition, Kurosumiru of the present invention, the upper and lower word
Crosmi that crosses only crawls in a horizontal plane
The work roll and this work roll
Apply lubricant between the supporting intermediate roll and the backup roll.
To reduce frictional force to reduce thrust force between rolls
A lubricant supply device is provided, and the work roll, an intermediate roll, or a standby roll is provided with a thrust measuring device that measures a thrust load of at least one of the rolls, and the lubricant supply device is provided based on a measurement result of the thrust measurement device. A lubrication amount command device for instructing an increase or decrease of the lubricant supply amount is provided.

[0014]

SUMMARY OF] According to this Kurosumiru, whereupon a lubricant to between the rolls of the copy roll or intermediate rolls for supporting the work rolls so as to supply the lubricant supply device DOO
In addition, a brake device is installed on
The controller uses the brakes in response to the
The roll mechanism is controlled to reduce the friction between the rolls, thereby reducing the thrust force applied to supporting rolls such as pre-rolls and intermediate rolls, enabling crossing of only work rolls, and a cross mechanism. Tomo and can also be easily
The rolling mill by supplying lubricant between the rolls
Between rolls to slow down or to make an emergency stop.
Slip occurs, causing scratches on the surface of work rolls, etc.
To prevent that.

[0015]

Further, according to the cross mill, the cross angle is changed by the cross angle changing device in accordance with the command from the cross angle command device, and at the same time, the command to increase / decrease the amount of the lubricant supplied to the lubricant supply device by the change in the cross angle is issued. It changes the amount of lubrication according to the thrust force that increases and decreases with the change of the cross angle, without supplying excessive lubricant,
An appropriate lubricant can be supplied.

Further, according to this cross mill, at least one of the cross mills is provided with a thrust measuring device for measuring a thrust load applied to the roll, and based on the measurement result, the lubrication amount command device sends a command to the lubricant supply device. Is output to change the amount of lubricant supply, and the amount of lubrication is increased or decreased in accordance with the generation of a thrust load, so that there is no excessive supply of lubricant.

As a result, a cross mill using only work rolls can be realized, and safe operation can be achieved.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic side view according to an embodiment in which the cross mill of the present invention is applied to a four-high rolling mill. In the cross mill 10, only the upper and lower work rolls 11 and 12 are crossed, and although not shown, the roll chock supported by the housing is movable by a cross mechanism, and is perpendicular to the line in a horizontal plane. The rotation axes of the upper and lower work rolls 11 and 12 can cross each other.

The upper and lower rolls 13 and 14 for supporting the upper and lower work rolls 11 and 12 have their rotating shafts arranged in a direction perpendicular to the line as in a normal rolling mill, so that the roll chocks are fixed to the housing. Has become.

A lubricant supply device 16 for supplying a lubricant 15 is provided between the upper work roll 11 and the upper holding roll 13 of the cross mill 10 and between the lower work roll 12 and the lower holding roll 14. Have been. The lubricant supply device 16 has a lubricant supply pipe 17 attached to the housing along the roll axis direction of the upper and lower rolls 13 and 14, and a number of spray nozzles 18 attached to the lubricant supply pipe 17. The lubricant in the agent tank 19 is supplied under pressure by a pump 20. Further, a seal jacket 21 is provided so as to cover the lubricant supply pipe 17, and the leading edge thereof comes into contact with the surfaces of the upper work roll 11 and the upper holding roll 13 or the surfaces of the lower work roll 12 and the lower holding roll 14. Since the lubricant 15 sprayed from the spray nozzle 18 is sealed, the lubricant 15 is not excessively applied to the plate. Further, on the entry sides of the upper and lower work rolls 11 and 12, for example, a spatula-like lubricant scraping device 27 made of rubber or the like is provided so that the lubricant 15 is removed.
Is to be scraped off. As the lubricant 15 supplied between these rolls, for example, lubricating oil is used.

In the cross mill 10 configured as described above, lubricating oil is supplied as a lubricant 15 between the upper work roll 11 and the upper roll 13 and between the lower work roll 12 and the lower roll 14 as a lubricant. 18
From the upper and lower work rolls 11, 1
The friction coefficient between the rolls 2 and the upper and lower rolls 13 and 14 is reduced, and the thrust force generated between the rolls can be reduced.

Thus, the upper and lower work rolls 11, 12
When only the work rolls are crossed and the upper and lower rolls 13 and 14 are not crossed, the thrust force between the rolls is reduced, thrust countermeasures can be easily performed, and a cross mill consisting of only work rolls is used without a pair cross mill. Work rolls 11 and 12
Just good and easy.

Next, in such a cross mill 10, the coefficient of friction between the upper and lower work rolls 11, 12 and the upper and lower rolls 13, 14 is reduced, so that the thrust force generated between the rolls can be reduced. , Cross mill 10
Work roll 1 when emergency stop or sudden deceleration of
Since the coefficient of friction between the rolls 1 and 12 and the rolls 13 and 14 is small, the work rolls 11 and 12 and the rolls 13 and 14
In this case, roll slip may occur, and the rolls 13 and 14 may continue to rotate due to inertial force, and the surfaces of the work rolls 11 and 12 may be damaged.

In order to drive the work rolls 11 and 12 in the cross mill 10, as shown in FIG.
The brake devices 22, 23 are controlled by a control device 24. An emergency stop signal and a sudden deceleration signal of the cross mill 10 are input to the control device 24, and the operation of the brake devices 22 and 23 is controlled based on the emergency stop signal and the rapid deceleration signal.

Therefore, the brake devices 22, 23
In the cross mill 10 provided with the control device 24, when the work rolls 11 and 12 are stopped or decelerated suddenly, an operation signal is output from the control device 24 to the brake devices 22 and 23 by the signal, and the upper and lower control rolls 13 and 14 The brake is applied.

As a result, the work rolls 1 and 12 can be stopped or decelerated so as not to cause a roll slip between the work rolls 11 and 12 and the copy rolls 13 and 14.
It is possible to prevent surface flaws and the like from occurring on 1, 12 and the like.

Next, another embodiment of the cross mill according to the present invention will be described with reference to FIGS.

In the crocum mill of this embodiment, the amount of the lubricant 15 supplied from the lubricant supply device 16 is increased or decreased according to the cross angle of the work rolls 11 and 12, or the thrust load is detected. The supply amount of the lubricant 15 from the lubricant supply device 16 is increased or decreased based on the above.

In this cross mill, the work rolls 11,
A cross angle changing device 30 for changing the cross angle of the upper and lower work rolls 11 and 12 is provided on the drive side of the upper and lower work rolls 11 and 12, as shown in FIGS. They are supported via radial bearings. These drive-side axle boxes 31 and 32 are
Is positioned by pressing a positioning rod 36 which is connected to a positioning servo cylinder 34 attached to the motor and guided by a rod holding bracket 35 and reciprocally driven.

As shown in FIGS. 4 and 6, thrust bearing shaft boxes 37 and 38 are provided on the roll changing sides of the upper and lower work rolls 11 and 12, and are supported via thrust bearings and radial bearings. It has become. These thrust bearing boxes 37, 38 are provided with arm portions 37a,
The thrust receiving keeper plate 3 slidable along the groove 33a (see FIG. 7) of the housing 33 on the outside of the housing 38.
The rod of the keeper plate opening / closing cylinder 41 attached to the housing 33 is connected to the base ends of the thrust receiving keeper plates 39 and 40 via the housing 33.

The compression plates 42, 43 are provided inside the arm portions 37a, 38a of the thrust receiving shaft boxes 37, 38.
Are interposed between the housing 33 and the arm portion 37.
a and 38a are supported by being sandwiched between thrust receiving keeper plates 39 and 40.

In order to change the cross angle of the work rolls 11 and 12 by such a cross angle changing device 30, a cross angle command device 44 is provided, and the cross angle can be set by a cross angle setting device 45. An operation signal is output to the positioning servo cylinder 34 on the drive side and the keeper plate opening / closing cylinder 41 on the rearrangement side via the cross angle command device 44 according to the set cross angle.

Therefore, when the cross angle setting signal is output from the cross angle command device 44, the rod of the positioning servo cylinder 34 on the driving side expands and contracts up and down alternately as shown in FIG. Side box 31, 32
5, the arm parts 37a, 37a of the thrust receiving shaft boxes 37, 38 are moved by the keeper plate opening / closing cylinder 41 at the jaws of the thrust receiving keeper plates 39, 40, as shown in FIG. 3
The cross angle of the work rolls 11 and 12 can be changed by pressing 8a so that the work rolls 11 and 12 are shifted from each other.

When the cross angle of the work rolls 11 and 12 is changed by the cross angle changing device 30 as described above, the thrust force generally increases with an increase in the cross angle, and the amount of the lubricant 15 supplied between the rolls is increased. It is effective to increase or decrease the lubricant flow rate so that a lubricant flow control valve 25 is provided between the pump 20 of the lubricant supply device 16 and the lubricant supply pipe 17 and is controlled via the lubrication amount command device 26. Has become.

The lubrication amount command device 26 receives a cross angle set via a cross angle command device 44. The lubrication amount increases with an increase in the cross angle. The increase amount is not a simple proportional relationship, but an appropriate amount is supplied by using a function determined in advance by experiments or the like.

It is to be noted that excessive retention of the lubricant 15 between the rolls has an adverse effect on the rolling operation, and a lubricant discharge pump 28 is connected to the outlet side of the lubricant supply pipe 17 to remove the retained lubricant 15. Preferably, the lubricant is collected in the lubricant tank 19.

As described above, by controlling the amount of the lubricant 15 in accordance with the change of the cross angle, it is possible to always supply an appropriate amount of lubrication without excessively supplying the lubricant 15.

Next, a cross mill in which the supply amount of the lubricant is controlled in accordance with the generated thrust force will be described.

In the cross mill, even when the thrust force changes due to a change in the cross angle or a change in the rolling load, the lubricant 15 may be used.
It is effective to control the supply amount of thrust to reduce the thrust force.

Therefore, this cross mill is provided with a thrust measuring device 50 for measuring a thrust load, and an outward thrust load detector 5 composed of a strain gauge is provided outside each of the thrust receiving keeper plates 39 and 40.
1 and 52 are provided, and outward thrust loads are calculated and obtained by thrust load calculators 53 and 54.

In order to detect an inward thrust load, compression load meters 55 and 56 are attached to the compression plates 42 and 43, and the compression thrust load calculators 57 and 58 calculate the inward thrust load. It has become.

The calculation results of the thrust load calculators 53 and 54 and the compression thrust load calculators 57 and 58 are sent to two total thrust calculators 59 and 60 for calculation.
Further, the total thrust load is sent to the total thrust calculator / lubrication amount increasing / decreasing command device 61, and the lubrication amount determined based on the value is output to the lubricant flow control valve 25.

In the cross mill provided with such a thrust load measuring device 50, when the thrust load is applied outward or inward, the thrust load is applied to the outward thrust load detectors 51 and 52 or the compression load meter 55, The total thrust force is measured by the total thrust calculator 61.
When the thrust load is large, a command is issued to increase the amount of the lubricant 15.

According to such a thrust load, the lubricant 1
By controlling the supply amount of 5, it is possible to always supply an appropriate amount of lubricant without supplying an excessive amount of lubricant.

In the cross mills of these embodiments,
As the lubricant supply device 16, a number of spray nozzles 18 are attached to a lubricant supply pipe 17 to spray and supply the lubricant 15. As shown in FIG. 8, a porous lubricant roll 70 is used. The lubricant 15 is supplied and applied while being in contact with the rolls 13 and 14 while rolling, and an appropriate amount of the lubricant 15 is supplied to the porous lubricant roll 70 by connecting the lubricant flow control valve 25. And in this case,
A draining plate 71 is provided on the output side so as to be in contact with the surface of each roll, and removes water from the surfaces of the work rolls 11 and 12 and the auxiliary rolls 13 and 14 before applying the lubricant.
5 can be completely applied and the lubricant can be prevented from dropping on the rolled plate.

As a method of supplying the lubricant, a hole may be provided inside the work roll, and the lubricant may be supplied from the hole.

In the above embodiment, the case where the cross mill is applied to a four-high rolling mill has been described. However, the present invention is not limited to this, and may be applied to a multi-high rolling mill such as a six-high rolling mill.

The present invention is not limited to the case where the seal jacket covering the lubricant supply pipe is fixed, but may be displaced in accordance with the cross angle to have a deformable structure or movable so as to prevent leakage of the lubricant. You may do it.

Further, changes may be made to each component without departing from the scope of the present invention.

[0051]

As described above in detail with the embodiments, according to the cross mill of the present invention, the lubricant is supplied by the lubricant supply device between the work roll and the supporting roll or the intermediate roll supporting the work roll. so as to supply
At the same time, brake devices are installed on
Control by the rolling mill deceleration signal or stop signal.
Together since to control the brake system to reduce the friction between the rolls and it is possible to reduce the thrust force acting on the support rolls, such as copy roll or intermediate roll
The rolling mill by supplying lubricant between the rolls
Slip between rolls when emergency stop or sudden deceleration
And scratches on the surface of the work roll etc.
Can be prevented.

[0052] Thus, Rutotomoni easy to take measures of the thrust force generated between the rolls, I emergency stop or sudden decrease speed
A cloth that crosses only work rolls that can be safely performed
A mill can be realized, and the cross mechanism is simplified.

[0053]

[0054]

Further, according to this cross mill, the cross angle is changed by the cross angle changing device according to the command of the cross angle command device, and at the same time, the command to increase or decrease the amount of the lubricant supply to the lubricant supply device by the change of the cross angle is issued. Output, so the amount of lubrication is changed according to the thrust force that increases or decreases with the change in the cross angle, without supplying excessive lubricant,
An appropriate lubricant can be supplied.

According to this cross mill, at least one of the cross mills is provided with a thrust measuring device for measuring a thrust load applied to the roll, and based on the measurement result, the lubrication amount command device sends a command to the lubricant supply device. Is output and the lubricant supply amount is changed, so that the lubrication amount can be increased or decreased according to the generation of the thrust load, and there is no excessive lubrication supply.

As a result, a cross mill using only work rolls can be realized without affecting the rolled plate.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an embodiment in which a first cross mill of the present invention is applied to a four-high rolling mill.

FIG. 2 is a schematic perspective view of one embodiment in which the second cross mill of the present invention is applied to a four-high rolling mill.

FIG. 3 is a front view of an embodiment in which a third cross mill of the present invention is applied to a four-high rolling mill.

FIG. 4 is a plan view according to an embodiment in which the third and fourth cross mills of the present invention are applied to a four-high rolling mill.

FIG. 5 is a left side view of an embodiment in which the third and fourth cross mills of the present invention are applied to a four-high rolling mill.

FIG. 6 is a right side view according to an embodiment in which the third and fourth cross mills of the present invention are applied to a four-high rolling mill.

FIG. 7 is a partial explanatory view according to an embodiment in which the third and fourth cross mills of the present invention are applied to a four-high rolling mill.

FIG. 8 is a schematic side view of another embodiment in which the first to fourth cross mills of the present invention are applied to a four-high rolling mill.

FIG. 9 is a schematic configuration diagram of a conventional pair-cross type cross mill.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cross mill 11 Upper work roll 12 Lower work roll 13 Upper control roll 14 Lower control roll 15 Lubricant 16 Lubricant supply device 17 Lubricant supply pipe 18 Spray nozzle 19 Lubricant tank 20 Pump 21 Seal jacket 22 Brake device 23 Brake device 24 Control device 25 Lubricant flow control valve 26 Lubrication amount command device 27 Inlet-side lubricant scraping device 30 Cross angle changing device 34 Positioning servo cylinder 41 Keeper plate opening / closing cylinder 44 Cross angle command device 45 Cross angle setting device 50 Thrust measuring device 51, 52 Outward thrust load detector 55, 56 Compression load meter 61 Overall thrust calculator and lubrication amount increase / decrease command device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21B 13/14 B21B 27/10 B21B 1/22 B21B 45/02 310

Claims (3)

(57) [Claims] (1) Only upper and lower work rolls are mutually positioned in a horizontal plane.
In the cross mill, the work roll
And an intermediate or supporting roll that supports this work roll.
Lubricant by supplying friction between the roll
While providing a lubricant supply device to reduce the inter-thrust force, while providing a brake device on the intermediate roll or the retaining roll,
The features and to torque Rosumiru that a control device is provided for controlling the operation of the deceleration or stop signal of the work roll the braking device. 2. Only the upper and lower work rolls are mutually in a horizontal plane.
In the cross mill, the work roll
And an intermediate or supporting roll that supports this work roll.
Lubricant by supplying friction between the roll
The lubricant supply device that reduces between thrust force provided, the cross angle changing device for changing the cross angle of the Kurosumiru, a cross angle command unit for commanding the cross angle in the cross angle changer, the cross angle command device features and to torque loss <br/> mill that includes a lubricating amount command device for outputting a command to increase or decrease the lubricant supply amount to the lubricant supply device according to the cross angle. 3. Only the upper and lower work rolls are mutually in a horizontal plane.
In the cross mill, the work roll
And an intermediate or supporting roll that supports this work roll.
Lubricant by supplying friction between the roll
A lubricant supply device for reducing the inter-thrust force is provided, and the work roll, an intermediate roll or a standby roll is provided with a thrust measuring device for measuring a thrust load of at least one of the rolls, based on a measurement result of the thrust measuring device. features and to torque Rosumiru in that a lubricating amount command device for commanding an increase or decrease in the lubricant supply amount to the lubricant supply device.