JPH0694042B2 - Work roll cooling method for rolling mill and apparatus therefor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a work roll cooling method for a rolling mill and a device therefor.

[Conventional technology]

When a cladding material is manufactured by a rolling mill, a strong pressure acts on a pair of work rolls, so that the work rolls expand and deform due to heat generation, and the cladding material deforms. Particularly when a long or wide cladding material is pressure-bonded and rolled, the central portion of the work roll expands to generate a so-called thermal crown, which gives the cladding material a medium elongation.

In order to prevent this phenomenon, the surface of the work roll is directly sprayed with cooling water, or a coolant is flown into the cavity formed in the work roll, and the method of indirectly cooling the surface of the work roll is a single material rolling process. Are known.

[Problems to be Solved by the Invention]

However, in the former method, although it is a direct cooling method, since the atomized water is sprayed as a refrigerant, the cooling effect is generally insufficient, and a large amount is required to obtain a sufficient cooling effect. When water is sprayed, especially when it is applied to a work roll for rolling a cladding material, there is a problem that splashed water penetrates into the joints of the cladding material during pressure bonding / rolling, which causes peeling of the cladding material. In addition, the latter method is an indirect cooling method, so that not only the cooling efficiency is poor, but also the structure is complicated.

[Means for Solving the Problems]

The present invention has been made in view of the above circumstances, and its configuration is such that each of the work rolls of the rolling apparatus that presses and rolls the cladding material with a pair of upper and lower work rolls, in the traveling direction of the cladding material. Located in the first half, the pad having permeability is brought into direct contact with the pad to supply the temperature-controlled cooling emulsion liquid, and the emulsion liquid flowing down along the work roll is wiped with a wiper. After picking up, the air is blown out toward the front in the advancing direction of the clad material from the nozzles that are collected in the pan and arranged on both sides of the clad material in the width direction, and further flow down along the work roll, and crimping and rolling This is a work roll cooling method for a rolling mill, characterized in that the emulsion liquid flowing toward the pressure-bonded joint surface of the previous cladding material is blown off.

Then, the work roll cooling device of the rolling device that presses and rolls with a pair of upper and lower work rolls to form the cladding material is placed in the front half of the surface of the pair of work rolls in the traveling direction of the cladding material. A pad having permeability that directly supplies an emulsion liquid for cooling, a plurality of liquid tanks controlled to different temperatures, pipes that respectively communicate the liquid tank and each pad, and a lower portion of each pad. A wiper for wiping the emulsion liquid flowing down from the pad along the work roll, a tray for receiving the emulsion liquid captured by the wiper, and a cladding material arranged on both sides in the width direction of the cladding material. The nozzle that blows out the air toward the front in the advancing direction and blows off the emulsion liquid that flows toward the crimped joint surface of the cladding material before crimping and rolling. Has a closing valve for switching communication of the pipe so that the respective pads and the one of the liquid tank selectively communicating, and a flow rate adjuster for adjusting the flow rate of the pipe.
Further, in the work roll cooling device of this rolling mill, the temperature of the work roll is detected, temperature detection means for outputting the temperature detection value, reference value setting means for outputting the reference value indicating the reference temperature of the work roll, and It is possible to provide a comparison means for comparing the detected temperature value with the reference value, and a drive device for switching the on-off valve based on the comparison result.

[Action]

Thus, according to the work roll cooling method of this rolling apparatus, the temperature-controlled emulsion liquid, which is a cooling liquid, permeates into each pad, and the first half of the surface of the pair of work rolls in the advancing direction of the cladding material. It is directly supplied to remove heat from each work roll, effectively cooling each work roll. The emulsion liquid that has been cooled and flows down along each work roll is wiped off by a wiper, then received in a pan, and blown off by the air blown out from a nozzle, during pressure bonding and rolling. It is possible to prevent the emulsion liquid from entering the joints of the cladding materials. The emulsion solution not only promotes rusting and discoloration of the work roll surface, but also has a cleaning action.

Further, according to the work roll cooling device of the rolling device of the second aspect, the communication of the pipes is switched by the opening / closing valve, each pad is selectively communicated with any one of the liquid tanks, and the flow controller is used. Then, by adjusting the flow rate of the pipe, the emulsion liquid of a predetermined temperature and an appropriate amount is supplied to each pad. The emulsion liquid supplied to each pad is cooled in the first half of the cladding material of each work roll in the traveling direction, then flows down along each work roll, is wiped off by a wiper, and is received in a pan. Are collected and collected. Further, the emulsion liquid that flows down is blown off by the air blown from the nozzle, and the emulsion liquid is prevented from entering the joints of the cladding materials.

Then, the temperature of the work roll is detected by the temperature detecting means, and based on the detection result, by switching the on-off valve and adjusting the opening degree of the flow rate controller, an appropriate amount of the emulsion liquid having an appropriate temperature for cooling can be obtained. Can be automatically supplied to the pad.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

An embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 1 is a combination material (for example, steel as a core material).
It consists of 1a and stainless steel 1b, 1b which is a laminated material. ) And between the pair of upper and lower work rolls 2 and 2 ′ supported by the pair of back up rolls 3 and 3 ′ of the rolling device,
It is pressure-bonded and rolled, and wound as a cladding material 1'on a winding reel 4.

Direct contact cooling devices 7, 7'are provided in the front half of the work rolls 2, 2'in the advancing direction of the cladding material 1 ', that is, the half on the side of the cladding material 1'. The direct contact type cooling device 7 is made of metal such as stainless steel as shown in FIG. 3, and has a box-shaped pad holding container 10 which is curved in an arc shape.
The pad 11, which is made of heat-resistant fiber having permeability and which adheres well to the work roll 2, is held by the pad holding container 10 and the inner peripheral surface of which is in contact with the cylindrical surface of the work roll 2, and the pad holding container 10. The upper surface of the work roll 2 is composed of a plurality of injection ports 12 that are appropriately opened in the upper half (two in the center and one on each side) and are supplied with emulsion liquid. One set is arranged in. As shown in FIG. 4, the width of the pad 11 in the direction of the central axis is slightly wider than the width of the cladding material 1 '. Further, porous partition plates 13 such as punching plates are arranged at appropriate intervals on both inner sides of the pad holding container 10. Each partition plate 13 is inclined downward from both sides of the pad holding container 10 toward the center so that the emulsion liquid supplied to the pad 11 from the liquid injection ports 12 on both sides is concentrated in the center. The reason is that work roll 2
This is because the temperature rise in the central portion of the is larger than that of both sides, so that a large amount of emulsion liquid is supplied to the central portion to suppress the thermal crown. The direct contact cooling device 7'equipped on the lower work roll 2'has substantially the same structure. The emulsion solution contains an emulsifier as a main component and water added thereto.

Below the direct contact type cooling devices 7 and 7 ', recovery devices 8 and 8'for collecting the emulsion liquid flowing out from the pad 11 and flowing down along the outer surfaces of the work rolls 2 and 2'are provided. Further, in the vicinity of the work roll 2 on the upper side in the middle portion between the work rolls 2 and 2 ', they are located on both sides in the width direction of the cladding material 1', and the front side of the traveling direction of the cladding material 1 '(see FIG. 1). And a nozzle 14 that strongly blows air toward the right). The recovery device 8 is made of heat-resistant rubber (natural rubber or elastomer) as shown in FIG.
A wiper 8a whose tip is in sliding contact with the outer surface of the work roll 2 to wipe off emulsion liquid adhering to the work roll 2
And a pan 8b for receiving the emulsion liquid captured by the wiper 8a, and a pipe for returning the emulsion liquid in the pan 8b to the storage tank 9. The recovery device 8'equipped on the lower work roll 2'has substantially the same structure.

The emulsion liquid stored in the storage tank 9 is pumped by the pump 27
One of the pipes 51 is sent to the pipe 50 and branches from the pipe 50.
Is led to the liquid tank 29 in which the relatively high temperature emulsion liquid is stored, and is guided to the liquid tank 33 in which the relatively low temperature emulsion liquid is stored in the other pipe 52 branched from the pipe 50. The pipes 51 and 52 are provided with open / close valves 22 and 24, which are electromagnetic valves, respectively. Further, the liquid tank 29 and the liquid tank 33 are connected to the pipe 53 via the on-off valves 21 and 23, which are electromagnetic valves, respectively, and are connected to the pipes 54 and 54 ′ branched from the pipe 53 via the pump 26, and one of The pipe 54 is connected to the pipe 5 via the flow controller 25.
The pipe 55 is branched into 5,56 and is connected to a plurality of liquid injection ports 12 of one direct contact type cooling device 7 equipped on the work roll 2 on the upper side through an opening / closing valve 20a which is a solenoid valve, Plumbing 56
Is connected to a plurality of liquid injection ports 12 of another direct contact cooling device 7 via an on-off valve 20b which is a solenoid valve. Plumbing 53
The other pipe 54 ′ that branches from the same is connected to the flow controller 25 ′.
Via the opening / closing valve 20′a, which is a solenoid valve, to the work roll 2 ′ on the lower side. ′ Is connected to a plurality of liquid injection ports 12 and the pipe 56 ′ is connected to a plurality of liquid injection ports 12 of another direct contact cooling device 7 ′ through an opening / closing valve 20′b which is a solenoid valve. ing. Of course, the flow controller 25,2
The function of 5'can be given to the on-off valves 21, 23, 20a, 20b, 20'a, 20'b.

The temperature of the liquid tank 29 is detected by the hot liquid temperature detector 30,
The temperature control device 32 turns on / off the heater 31 and appropriately heats the emulsion liquid to maintain the emulsion liquid at a predetermined high temperature.

The temperature of the liquid tank 33 is detected by the cold liquid temperature detector 34,
The driving time of the refrigerating device 35 is controlled based on the detection result, and the circulation pump 28 circulates the refrigerant to maintain the emulsion liquid at a predetermined low temperature. 36 is an expansion tank.

In the work roll cooling device of such a rolling device, first, when it is predicted that the temperatures of the work rolls 2 and 2 ′ are significantly different before the start of the crimping / rolling work and at the end of the crimping / rolling work, Liquid tank 29 in both direct contact cooling devices 7, 7 '
Supply the high-temperature emulsion liquid of both work rolls 2,
2'is heated appropriately.

Next, after starting the crimping / rolling work, each work roll 2,2 '
Depending on whether the outer surface temperature of the liquid is high or low, the emulsion liquid mainly stored in the liquid tank 33 is directly cooled by the direct contact type cooling devices 7, 7 '.
Supply only the appropriate amount. For this, each work roll 2,
Thermocouples 5, 5'and 6 as temperature detecting means for detecting the temperatures of 2'and the outlet side cladding material 1'are provided respectively, and the temperature detection values thereof are inputted to the control device 40. As shown in FIG. 5, in the first comparing means 42 of the control device 40, the thermocouple is used.
The respective temperature detection values a and a'of 5, 5'are compared with the first reference value b from the first reference value setting means 44 incorporated in advance, and the first drive device 41 (electromagnetic wave) based on the comparison result c. The solenoid of the valve) to automatically open and close each of the on-off valves 21, 23, 20a, 20'a, 20b and 20'b, and based on this comparison result c
The drive device 43 (solenoid of the solenoid valve) is driven to automatically control the openings of the flow rate controllers 25, 25 'to maintain the temperature of the work rolls 2, 2'at a predetermined value.

For example, when the temperature detection value a of the thermocouple 5 of the upper work roll 2 is considerably larger than the first reference value b, the first drive device 41 is driven according to the comparison result c from the control device 40, The opening / closing valve 21 is closed, the opening / closing valve 23 (20a, 20b) is opened, the flow rate controller 25 is driven by the second drive device 43 to be opened appropriately, and at the same time, the pump 26 is driven to Tank
An appropriate amount of 33 relatively low temperature emulsion liquid is supplied from each liquid injection port 12 to the pad 11. As a result, the work roll 2 is temperature-controlled, is effectively cooled by the emulsion liquid having a relatively low temperature, and is automatically controlled to a predetermined temperature. At that time, the temperature of the cladding material 1'is detected by the thermocouple 6, and the detected value d and the second reference value setting means 45 outputs the second value.
The second comparison means 46 compares the reference value e with the reference value e, and the correction means 47 corrects the comparison result c based on the comparison result f.
The second drive device 43 is driven by the correction value g to control the flow rate controller 25 and the like.

On the other hand, when the temperature detection value a of the thermocouple 5 is slightly larger than the first reference value b, particularly in the case of cold rolling, the comparison result c of the first comparison means 42 of the control device 40 indicates that The first temperature controller 41 is driven to close the on-off valve 23, and the on-off valve 21
(20a, 20b) is opened to switch the on-off valves 21 and 23, the flow rate controller 25 is driven by the second drive device 43 to be opened appropriately, and at the same time, the pump 26 is driven and the liquid tank 29 A relatively high temperature emulsion solution is supplied to the pad 11 from each injection port 12. As a result, the work roll 2 is appropriately cooled by the emulsion liquid having a relatively high temperature. At that time, in consideration of the temperature of the cladding material 1 ′ detected by the thermocouple 6, the second drive device 43 can be driven with the correction value g to control the flow rate controller 25 and the like.

Based on the detected temperature value a'of the other thermocouple 5 ', the temperature of the lower work roll 2'is similarly adjusted.

The emulsion liquid supplied to each pad 11 and used for cooling the work rolls 2, 2 ′ flows out from the pad 11 and flows down on the outer surface of each work roll 2, 2 ′. This emulsion liquid is wiped off by each wiper 8a of the recovery device 8,
It is received in the tray 8b, is returned to the storage tank 9 through the respective pipes, and is circulated for use. Further, a small amount of emulsion liquid that passes through the wiper 8a and flows down along the upper work roll 2 is provided at both sides in the width direction of the cladding material 1 ′ by being positioned at the intermediate portion between the pair of work rolls 2 and 2 ′. The air strongly blown out from the nozzle 14 toward the front side in the traveling direction of the cladding material 1 ′ is blown away and prevented from entering the pressure-bonded joint surface of the combination material 1.

The upper backup roll 3 is also provided with a direct contact cooling device 7 having a structure similar to that of the direct contact cooling device 7 and a recovery device 8 for recovering emulsion liquid, so that the backup roll 3 can be cooled. Further, a container 15 can be provided below the lower backup roll 3 ', and after receiving the emulsion liquid dripping from the backup roll 3', it can be returned to the storage tank 9.

FIG. 6 is a temperature-time characteristic in which the vertical axis represents the surface temperature (° C.) of the central portion of the work rolls 2, 2 ′ and the horizontal axis represents time (t), where A is an uncooled temperature curve. , B is a temperature curve of the indirect cooling method, C is a temperature curve of the direct contact cooling method according to the present invention, and D is a temperature curve at a side portion about 200 mm away from the center of the work rolls 2, 2 '. The temperature at the start of crimping and rolling was set to be the same. As is known from the figure, according to the present invention, the temperature difference between the work rolls 2 and 2'during the pressure bonding / rolling operation is small in both the central portion and the side portions, and no cooling (A) and an indirect cooling method ( It can be seen that good temperature control is obtained as compared with B).

〔The invention's effect〕

As can be understood from the above description, according to the present invention, the following effects can be obtained.

(1) According to the invention of claim 1, since the emulsion liquid is directly supplied through the pad arranged in the front half of the traveling direction of the cladding material, the cooling efficiency is excellent and a small amount of the cooling liquid is used. The work roll is quickly adjusted to the proper temperature,
The small amount of emulsion liquid after being cooled is wiped down by the wiper while flowing down the first half of the work roll, and then received by the saucer to be suppressed from drip on the surface of the cladding material. The emulsion liquid that slightly drops on the surface of the cladding material and flows toward the pressure-bonded joint surface is blown off by the air blown out from the nozzle, so it is difficult for it to penetrate into the mating surface during pressure-bonding / rolling.

This nozzle is arranged on both sides of the cladding material in the width direction,
Since air is blown out in the forward direction of the clad material, the emulsion liquid flowing on the surface of the clad material is blown away by the air blown out from the nozzle toward the front in the forward direction and inward in the width direction, and pressure bonding / Since it is surely blown off immediately before entering the crimped joint surface before rolling, it is possible to prevent the emulsion liquid from intervening in the crimped joint surface during crimping / rolling, while flowing down the first half of the work roll. . As a result, it is possible to effectively prevent the emulsification solution from penetrating into the pressure-bonded joint surface of the cladding material and causing the peeling of the cladding material, and the quality of the cladding material as a product is significantly improved.

(2) Since the temperature-controlled emulsion liquid is directly supplied to the pair of work rolls via the pad, the cooling efficiency is excellent, and the work rolls are quickly adjusted to an appropriate temperature by a small amount of the coolant. As a result, excessive thermal expansion of the work roll is well suppressed, and especially during pressing and rolling of wide and long cladding materials, the central part of the work roll undergoes excessive thermal expansion and thermal crown is generated. It was very well prevented that the central part of the cladding material was depressed and a shape defect such as middle elongation was caused.

(3) Since the emulsion liquid is used as the cooling liquid, there is no fear of promoting the oxidation and discoloration of the roll material as compared with the case of using the cooling water.

(4) According to the invention described in claim 2, the work roll cooling device of the rolling device can be obtained by a simple structure, and the same effect as the invention described in claim 1 can be obtained.

(5) According to the third aspect of the present invention, since an appropriate temperature and an appropriate amount of emulsion liquid according to the temperature of the work rolls are automatically supplied to each work roll, it is possible to obtain a cladding material of even better quality. .

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is a control system diagram of the same, FIG. 3 is an enlarged front view of a direct contact cooling device, and FIG. FIG. 5 is a side view with the pad of the contact cooling device omitted, FIG. 5 is a block diagram showing the arrangement of the components, and FIG. 6 is a diagram showing the work roll temperature-time characteristics. 1: Combination material, 1 ': Clad material, 2, 2': Work roll,
4: Take-up reel, 5, 5 ', 6: Thermocouple (temperature detection means), 7,
7 ': direct contact cooling device, 8, 8': recovery device, 8a: wiper, 8b: pan, 9: storage tank, 10: pad holding container, 11: pad, 1
2: Injection port, 13: Partition plate, 14: Nozzle, 20a, 20′a, 20b, 20′b, 2
1,22,23,24: Open / close valve, 25,25 ': Flow controller, 29,33: Liquid tank, 4
1: first drive device (drive device), 42: first comparison means (comparison means), 43: second drive device, 44: first reference value setting means (reference value setting means), 45: second reference value Setting means, 53, 54, 54 ', 55, 5
5 ', 56, 56': piping, a, a ': temperature detection value, b: first reference value (reference value), c: comparison result.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masamitsu Murai, No. 4, Chazu-cho, Muroran-shi, Hokkaido Inside the Japan Steel Works (56) References JP 61-71116 (JP, A) JP 54-145355 (JP) , A) JP-A-59-169612 (JP, A) Actually developed S58-38304 (JP, U)

Claims (3)

[Claims] 1. A permeable pad is directly brought into contact with each of the work rolls of a rolling device for pressing and rolling the cladding material with a pair of upper and lower work rolls, by arranging it in the front half of the traveling direction of the cladding material. The temperature-controlled cooling emulsion liquid is supplied to the pad, and the emulsion liquid flowing down along the work roll is wiped off with a wiper and then collected in a pan, and in the width direction of the cladding material. Air is blown from the nozzles arranged on both sides of the cladding material toward the front in the traveling direction of the cladding material, further flows down along the work roll, and the emulsion liquid flowing toward the pressure bonding joint surface of the cladding material before pressure bonding and rolling is flowed. A method for cooling a work roll of a rolling mill, which is characterized by blowing off. 2. A work roll cooling device of a rolling device which presses and rolls a pair of upper and lower work rolls to form a cladding material, the first half of the surface of each of the pair of work rolls in the traveling direction of the cladding material. Located in the area
A pad having permeability that directly supplies the emulsion for cooling, a plurality of liquid tanks controlled to different temperatures, pipes that respectively communicate the liquid tank and each pad, and are arranged below each pad. , A wiper for wiping the emulsion liquid flowing down from the pad along the work roll, a tray for receiving the emulsion liquid captured by the wiper, and a width direction of the cladding material, which are arranged on both sides in the width direction of the cladding material. To blow out the emulsion liquid flowing toward the pressure-bonded joint surface of the cladding material before pressure-bonding / rolling and each pad and one of the liquid tanks to selectively communicate with each other. A work roll cooling device for a rolling mill, comprising: an open / close valve that switches communication between the pipes and a flow rate controller that adjusts a flow rate of the pipes. 3. A temperature detecting means for detecting a temperature of a work roll and outputting a temperature detection value, a reference value setting means for outputting a reference value indicating a reference temperature of the work roll, the temperature detection value and the reference value. The work roll cooling device of the rolling mill according to claim 2, further comprising: a comparison unit that compares the comparison result and a drive device that switches the on-off valve based on the comparison result.