JP2003145209A - Rolling mill and method for manufacturing clad material using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling mill which controls the rolling torque of each rolling roll, and also to provide a method for manufacturing a clad material using the same. SOLUTION: The rolling mill 10 is for manufacturing the clad material 3 by rolling and bonding a plurality of plates 1 and 2 by using at least a pair of rolling rolls 11a and 11b. The rolling mill 10 is provided with detecting means 31a to 32a and 31b to 32b to detect the rolling torque of each rolling roll 11a and 11b, control means 33 to 36 to control the amount of a lubricating oil O to be supplied to the circumferential surface of each rolling roll 11a and 11b on the basis of the detected rolling torque of each rolling roll 11a and 11b, and lubricating oil supplying means 37a to 39a and 37b to 39b which are connected to the control means 33 to 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill and a method for producing a clad material using the rolling mill, and more particularly, to a rolling mill used for producing a clad material obtained by rolling and adhering a plurality of plate materials, and a rolling mill for the same The present invention relates to a method for manufacturing the clad material.

[0002]

2. Description of the Related Art A rolling mill for rolling and adhering a plurality of plate materials to produce a clad material, for example, a four-high rolling mill, has upper and lower rolling rolls that perform roll bonding and upper and lower rolling rolls that press each rolling roll in the plate material direction. It is mainly composed of a back roll and a drive device for rotationally driving the rolling roll.

The driving force of the motor in the drive unit is transmitted to gears meshing with each other via a reduction gear, and the rotation of these gears rotates an upper rolling roll and a lower rolling roll connected to each gear. . By inserting a plurality of plate materials between the rolling rolls, rolling is performed and a clad material is obtained.

[0004]

By the way, while rolling is performed by using a rolling mill, the upper rolling roll is changed due to the change of the state of each rolling roll and the plate material, especially the temperature change of each rolling roll and the plate material. Also, there is a problem that the rolling torque of the lower rolling roll becomes non-uniform.

Here, the rolling torque is closely related to the frictional force generated between each rolling roll and the plate material, and this frictional force depends on the type and supply amount of the lubricating oil dropped on each rolling roll, and , Is affected by the blending ratio of the extreme pressure agent added to the lubricating oil. Therefore, it is possible to change the frictional force between each rolling roll and the plate material by changing the type and supply amount (dripping amount) of lubricating oil and the compounding ratio of the extreme pressure agent, which in turn changes the rolling torque of each rolling roll. Can be changed.

[0006] However, although the rolling torque can be changed by changing the frictional force between each rolling roll and the plate material, it is difficult to control the rolling torque.

Further, it is ideal that the upper rolling roll and the lower rolling roll have the same diameter during rolling, but the upper rolling roll and the lower rolling roll are appropriately changed depending on the type of the clad material to be manufactured. Therefore, the diameter is often different in the upper and lower parts. When the number of rotations is the same, the peripheral speed of the roll peripheral surface is higher as the roll diameter is larger, and thus in the clad material, the extrusion speed is faster on the rolling surface on the large diameter roll side. Therefore, when rolling normally, the clad material is bent and extruded toward the rolling surface on the small diameter roll side, so normally, rolling is performed while pulling the clad material in the horizontal direction at a predetermined tension, This bend is prevented. However, due to this tension, a rotational force in the deceleration direction is applied to the large-diameter rolling rolls, and a rotational force in the acceleration direction is applied to the small-diameter rolling rolls. Since (circulation torque) is applied, it is necessary to supply an appropriate amount of lubricating oil to each rolling roll to reduce the circulation torque.

However, when supplying the lubricating oil, if the amount of the lubricating oil supplied is insufficient, the torque balance may be lost, and excessive rolling torque may damage some of the rolling rolls or the drive unit. On the contrary, if the amount of lubricating oil supplied is too large, there is a problem that the rolling torque is insufficient and good rolling cannot be performed.

An object of the present invention, which was devised in view of the above circumstances, is to provide a rolling mill capable of controlling the rolling torque of each rolling roll and a method for producing a clad material using the rolling mill.

[0010]

In order to achieve the above object, a rolling mill according to the present invention is a rolling mill for producing a clad material by rolling and adhering a plurality of plate materials using at least one pair of rolling rolls. Detecting means for detecting the rolling torque of each rolling roll, control means for controlling the amount of lubricating oil supplied to the peripheral surface of each rolling roll based on the detected rolling torque of each rolling roll, and connecting to the control means And a lubricating oil supply means that is provided.

Further, the control means controls the amount of lubricating oil supplied to the peripheral surface of each rolling roll based on the arithmetic unit for calculating the detected difference in rolling torque of each rolling roll and the torque difference. And a control device.

The lubricating oil supply means may include a lubricating oil supply line and an extreme pressure agent supply line to be added to and mixed with the lubricating oil.

According to the above rolling mill, on the other hand, the method for producing a clad material using the rolling mill according to the present invention uses a rolling mill having at least one pair of rolling rolls to roll-bond a plurality of plate materials. In the method of producing a clad material, the rolling torque of each rolling roll during rolling is detected, the difference between the detected rolling torques of each rolling roll is calculated, and the peripheral surface of each rolling roll is calculated based on the torque difference. The amount of lubricating oil supplied is controlled to control the load balance of each rolling roll.

The supply amount of the lubricating oil may be controlled by controlling the timing of dropping the lubricating oil.

Further, the supply amount of the lubricating oil may be controlled by controlling the timing of dropping the lubricating oil, and the compounding ratio of the extreme pressure agent added to the lubricating oil may be controlled.

According to the above manufacturing method, since the rolling torque of each rolling roll can be controlled, the manufacturability and productivity of the clad material can be improved, and the running cost of the rolling mill can be reduced. it can.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view of the rolling mill according to the first embodiment, and FIG. 2 is a sectional view taken along line 2-2 in FIG.
FIG. 3 shows a schematic perspective view of the rolling mill according to the first embodiment.

As shown in FIGS. 1 to 3, a rolling mill 10 according to the present embodiment has a pair of rolling rolls 11a and 11b provided horizontally and vertically with a predetermined gap K therebetween.
And upper and lower back rolls 12a and 12b provided above and below each of the rolling rolls 11a and 11b and pressing each of the rolling rolls 11a and 11b in the plate material direction, and each of the rolling rolls 11a,
11b is mainly configured by a drive device 30 that rotationally drives 11b via spindle shafts 23a and 23b.

Each rolling roll 11a, 11b is horizontally
Also, the roll chocks 13a and 13b provided above and below
Further, the back rolls 12a, 12b are rotatably supported by back roll chocks 14a, 14b provided above and below the roll chocks 13a, 13b, respectively. Alternatively, it is attached to a stand 21 provided on the base.

Couplings 22, 22 are provided at both ends of each spindle shaft 23a, 23b, and the rolling rolls 11a, 11 are provided by the couplings 22, 22.
b, the spindle shafts 23a and 23b, and the rotary shaft 24 of the drive device 30 are flexible (flexible).
Further, the spindle shafts 23a and 23b are provided with torque detectors (detection means) 31a and 31b such as strain gauges that detect the rolling torque of the rolling rolls 11a and 11b, respectively. Enclosed in an annular shape, torque detection signal transmitter / receiver (detection means)
32a and 32b are provided.

Each torque detection signal transmitter / receiver (detection means) 3
A control means is connected to 2a and 32b. The control means includes a torque signal converter 33 connected to the transmitters / receivers 32a and 32b, a torque calculator (calculator) 34 connected to the signal converter 33 for calculating a difference in rolling torque, and the torque calculator. A torque balance width setting device (control means) 35 and a lubricating oil control device (control device) 36, which are respectively connected to 34.

Lubricating oil supply means is connected to the lubricating oil controller 36. The lubricating oil supply means includes a lubricating oil O supply tank (not shown) and supply lines 37a and 37b thereof.
And a supply tank (not shown) for the extreme pressure agent G, supply lines 39a and 39b thereof, and a dropping device 38 connected to the tips of the supply lines 37a and 37b and supplying the lubricating oil O by dropping.
a and 38b. Supply line 39 for extreme pressure agent G
a and 39b are connected to the supply lines 37a and 37b of the lubricating oil O, respectively, and the extreme pressure agent G is supplied in a state of being added to and mixed with the lubricating oil O.

Extreme pressure agent G is added to and blended with the lubricating oil O. The extreme pressure agent G is added and blended in the lubricating oil O at a predetermined ratio in order to prevent the peripheral surfaces of the rolling rolls 11a and 11b and the plate materials 1 and 2, that is, the metals from directly contacting each other. By forming a film of the lubricating oil O to which the extreme pressure agent G is added and compounded on the circumferential surface of each rolling roll 11a, 11b, each rolling roll 11a, 11b and the plate material 1,
2 is rolled with a predetermined frictional resistance (friction force).

Next, the operation of this embodiment will be described.

The plate materials 1 and 2 are inserted into the gap K between the rolling rolls 11a and 11b, and dry rolling is carried out in the cold by a high pressure load, and the plate materials 1 and 2 are roll-bonded to obtain the clad material 3. To be The clad material 3 is pulled in a horizontal direction with a predetermined tension and wound on a winding roll (not shown).

As the rolling progresses (passage of time), generally, the rolling torque of the upper rolling roll 11a becomes larger than that of the lower rolling roll 11b. At this time, in the rolling mill 10 of the present embodiment, the rolling rolls 11a,
Since the torque detectors 31a and 31b are provided on the spindle shafts 23a and 23b connected to the 11b, the rolling torques of the rolling rolls 11a and 11b are detected in real time.

The detected rolling torques are detected by the torque detection signal transmitter / receivers 32a and 32b.
It is output as a and 41b, and is input to the torque signal converter 33. In the torque signal converter 33, the torque detection signals 41a and 41b are converted into torque signals 42a and 42b, and the torque signals 42a and 42b are input to the torque calculator 34.

In the torque calculator 34, the torque signal 4
The comparison calculation of 2a and 42b is performed, and the rolling torque difference 43 is calculated. This torque difference 43 is input to the torque balance width setting device 35, and a pulse signal 44 that determines the supply timing (supply interval) of the lubricating oil O is output. The pulse signal 44 is input to the lubricating oil controller 36 via the torque calculator 34. Here, the pulse signal 44 corresponding to the rolling torque difference 43 is previously calculated and input to the torque balance width setting device 35. If the rolling torque difference 43 is larger than the specified range, the supply timing of the lubricating oil O is adjusted so that the rolling torque difference 43 becomes smaller. For example, when the rolling torque difference of the upper rolling roll 11a is larger than the specified range and the rolling torque difference 43 is larger than the specified range, the supply interval of the lubricating oil O to the upper rolling roll 11a is shortened, and the upper rolling roll 11a is reduced. Make the rolling torque of 11a fall within the specified range.

Based on this pulse signal 44, the supply timing of the lubricating oil O supplied from the lubricating oil controller 36 is controlled, and the supply lines 37a and 37b and the dropping devices 38a and 3 are controlled.
It is dripped and supplied to the peripheral surface of each back roll 12a, 12b (or rolling roll 11a, 11b) via 8b. The lubricating oil O is supplied in a state where the addition / blending ratio of the extreme pressure agent G is constant. Also, the lubricating oil O is dropped and supplied by the back rolls 12a and 12b (or the rolling rolls 11a and 11b).
Although it may be only the rolled portion on the peripheral surface, it may be dropped and supplied to the entire peripheral surface.

Lubricating oil O supplied dropwise is applied to the peripheral surfaces of the back rolls 12a and 12b and the rolling rolls 11a and 11b.
A coating is formed on the peripheral surface of b. By controlling the dripping supply of the lubricating oil O, the frictional force between the rolling rolls 11a and 11b and the plate materials 1 and 2 can be freely controlled, and as a result, the rolling of the upper and lower rolling rolls 11a and 11b can be performed. The torque can be adjusted accurately and freely.

Here, the upper and lower rolling rolls 11a and 11b
As the rolling torque of the rolling roll 11 is larger, the manufacturability and productivity of the clad material 3 are better.
The drive device 30 is preferably continuously used near the maximum capacity. Further, in order to reduce the running cost of the rolling mill 10, it is preferable that the rolling rolls 11a and 11b and the driving device 30 have a long service life.
However, when the roll diameters of the upper and lower rolling rolls 11a and 11b are different, a circulating torque is generated as described above, and as a result, a load is generated in each drive gear of the drive device 30,
Device life tends to be shorter. Moreover, if the rolling rolls 11a and 11b and the driving device 30 are continuously used in the vicinity of the maximum capacity, the device life tends to be further shortened.

In the rolling mill 10 of this embodiment, by controlling the supply timing of the lubricating oil O supplied from the lubricating oil controller 36, the circumference of each of the back rolls 12a, 12b (or the rolling rolls 11a, 11b) is controlled. The drop supply amount of the lubricating oil O dropped and supplied to the surface is controlled. by this,
It is possible to control the rolling torques of the respective rolling rolls 11a and 11b so that there is no torque difference, that is, the rolling torques of the respective rolling rolls 11a and 11b can be uniformly controlled.

By uniformly controlling the rolling torque of each rolling roll 11a, 11b, each rolling roll 11a, 11b is controlled.
It is possible to reduce the circulating torque caused by the difference in the roll diameters of the rollers, and it is possible to reduce the load on each drive gear of the drive device 30 and the reduction gear. Thereby, the drive device 3
It is possible to extend the life of the rolling rolls 11a,
11b and the drive device 30 can be continuously used near the maximum capacity and for a long time. As a result, the manufacturability and productivity of the clad material 3 are improved, and the running cost of the rolling mill 10 can be reduced, so that the manufacturing cost of the clad material 3 can be reduced.

Next, another embodiment of the present invention will be described with reference to the accompanying drawings.

In the previous embodiment, by changing the supply timing of the lubricating oil O, the rolling rolls 11a, 11
The rolling torque of b was controlled uniformly.

On the other hand, in the rolling mill according to the second embodiment, the lubricating oil O is supplied while the supply timing of the lubricating oil O is constant.
It controls the blending ratio of the extreme pressure agent G added and blended with.

Specifically, as shown in FIG. 4, the rolling torque difference 43 obtained in the same manner as in the previous embodiment is input to the torque balance width setting device 35 to add to the lubricating oil O. Pulse signal 5 for determining the blending ratio of extreme pressure agent G
4 is output. The pulse signal 54 is input to the lubricating oil controller 36 via the torque calculator 34. here,
The pulse signal 54 corresponding to the rolling torque difference 43 is calculated in advance and input to the torque balance width setting device 35. If the rolling torque difference 43 is larger than the specified range, the blending ratio of the extreme pressure agent G is adjusted so that the rolling torque difference 43 becomes smaller. For example, since the rolling torque of the upper rolling roll 11a is larger than the specified range, the rolling torque difference 43
Is larger than the specified range, the compounding ratio of the extreme pressure agent G of the lubricating oil O that is dropped and supplied to the upper rolling roll 11a is reduced so that the rolling torque of the upper rolling roll 11a falls within the specified range.

Based on the pulse signal 54, the mixing ratio of the extreme pressure agent G of the lubricating oil O supplied from the lubricating oil controller 36 is controlled, and the supply lines 37a and 37b and the dropping device 38 are controlled.
It is dripped and supplied to the peripheral surface of each back roll 12a, 12b (or rolling roll 11a, 11b) via a, 38b.

Lubricating oil O supplied dropwise is applied to the peripheral surface of each back roll 12a, 12b and each rolling roll 11a, 11b.
A coating is formed on the peripheral surface of b. By controlling the blending ratio of the extreme pressure agent G of the lubricating oil O, each rolling roll 11a, 1
The frictional force between 1b and the plate materials 1 and 2 can be freely controlled, and as a result, the rolling torque of the upper and lower rolling rolls 11a and 11b can be adjusted accurately and freely.

Further, the rolling mill of the third embodiment controls the supply timing of the lubricating oil O and the blending ratio of the extreme pressure agent G added and blended with the lubricating oil O.

Specifically, as shown in FIG. 5, the rolling torque difference 43 obtained in the same manner as in the first embodiment is input to the torque balance width setting device 35, whereby the lubricating oil O
Pulse signal 4 that determines the supply timing (supply interval) of
4 and a pulse signal 54 for determining the blending ratio of the extreme pressure agent G to be blended with the lubricating oil O are output. These pulse signals 44 and 54 are input to the lubricating oil controller 36 via the torque calculator 34. Here, the pulse signals 44 and 54 corresponding to the rolling torque difference 43 are obtained by calculation in advance and input to the torque balance width setting device 35. If the rolling torque difference 43 is larger than the specified range, the supply timing of the lubricating oil O and the blending ratio of the extreme pressure agent G are adjusted so that the rolling torque difference 43 becomes smaller. For example, when the rolling torque difference of the upper rolling roll 11a is larger than the specified range and the rolling torque difference 43 is larger than the specified range, the supply interval of the lubricating oil O dropped and supplied to the upper rolling roll 11a is shortened. The blending ratio of the extreme pressure agent G of the lubricating oil O is reduced so that the rolling torque of the upper rolling roll 11a falls within the specified range.

Based on the pulse signals 44 and 54, the supply timing of the lubricating oil O supplied from the lubricating oil controller 36 and the mixing ratio of the extreme pressure agent G of the lubricating oil O are controlled, and the supply lines 37a, 37b and Each of the back rolls 12a and 12b (or the rolling roll 11) via the dropping devices 38a and 38b.
It is dripped and supplied to the peripheral surface of a, 11b).

Lubricating oil O supplied dropwise is applied to the peripheral surfaces of the back rolls 12a and 12b and the rolling rolls 11a and 11b.
A coating is formed on the peripheral surface of b. By controlling the supply timing of the lubricating oil O and the mixing ratio of the extreme pressure agent G of the lubricating oil O, the frictional force between the rolling rolls 11a and 11b and the plate materials 1 and 2 can be freely controlled. As a result, the rolling torque of the upper and lower rolling rolls 11a and 11b can be adjusted more accurately and freely as compared with the first and second embodiments.

It is needless to say that the embodiments of the present invention are not limited to the above-mentioned embodiments, and various other embodiments are possible.

[0046]

In summary, according to the present invention, the following excellent effects are exhibited. (1) By controlling the amount of the lubricating oil supplied to the peripheral surface of each rolling roll based on the torque difference of the rolling torque of each rolling roll, the rolling machine can control the rolling torque of each rolling roll. (2) By using the rolling mill of (1), it is possible to reduce the manufacturing cost of the clad material.

[Brief description of drawings]

FIG. 1 is a front view of a rolling mill according to a first embodiment.

2 is a cross-sectional view taken along line 2-2 of FIG.

FIG. 3 is a schematic perspective view of the rolling mill according to the first embodiment.

FIG. 4 is a schematic perspective view of a rolling mill according to a second embodiment.

FIG. 5 is a schematic perspective view of a rolling mill according to a third embodiment.

[Explanation of symbols]

1,2 plate material 3 Clad material 10 rolling mill Rolls 11a, 11b 31a, 31b Torque detector (detection means) 32a, 32b Torque detection signal transmitter / receiver (detection means) 33 Torque signal converter (control means) 34 Torque calculator (calculator of control means) 35 Torque balance width setting device (control means) 36 Lubricating Oil Controller (Control Device of Control Means) 37a, 37b Supply line (lubricating oil supply means) 38a, 38b Dripping device (lubricating oil supply means) 39a, 39b Supply line (lubricating oil supply means) 43 Rolling torque difference (difference in rolling torque) O Lubricating oil G extreme pressure agent

Claims (6)

[Claims] 1. A rolling mill for manufacturing a clad material by rolling and adhering a plurality of plate materials using at least one pair of rolling rolls, and a detecting means for detecting a rolling torque of each rolling roll and each detected rolling. A rolling mill comprising: a control unit that controls the amount of lubricating oil supplied to the peripheral surface of each rolling roll based on the rolling torque of the roll; and a lubricating oil supply unit that is connected to the control unit. 2. The control means calculates a difference between the detected rolling torques of the respective rolling rolls, and controls the amount of lubricating oil supplied to the peripheral surface of each rolling roll based on the torque difference. The rolling mill according to claim 1, further comprising a control device. 3. The rolling mill according to claim 1 or 2, wherein the lubricating oil supply means includes a lubricating oil supply line and an extreme pressure agent supply line to be added to and mixed with the lubricating oil. 4. A method for producing a clad material by rolling and adhering a plurality of plate materials using a rolling mill having at least one pair of rolling rolls, and detecting the rolling torque of each rolling roll during rolling to detect the rolling torque. It is characterized by calculating the difference in rolling torque of each rolling roll, controlling the amount of lubricating oil supplied to the peripheral surface of each rolling roll based on the torque difference, and controlling the load balance of each rolling roll. A method for manufacturing a clad material using a rolling mill. 5. The method for producing a clad material using a rolling mill according to claim 4, wherein the supply amount of the lubricating oil is controlled by controlling the timing of dropping the lubricating oil. 6. The rolling mill according to claim 4, wherein the supply amount of the lubricating oil is controlled by controlling the dropping timing of the lubricating oil, and the compounding ratio of the extreme pressure agent added to the lubricating oil is controlled. A method for producing a clad material using.