JP6201430B2 - Lubricating oil supply method and lubrication rolling method for cold rolling mill - Google Patents

Description

The present invention relates to an apparatus for supplying lubricating oil in cold rolling a metal strip such as a thin steel strip, and in particular, a two-fluid nozzle on both upper and lower surfaces of the metal strip on the entry side of a cold rolling mill. It relates lubrication rolling method by placing the lubricant header, the lubricating oil supplying method for injecting supplying the lubricating oil and the gas at the same time on the upper and lower surfaces of the metal strip, and by applying the method for cold-rolled with a is there.

  As is well known, in the cold rolling process of a metal strip such as a thin steel strip, the roll is lubricated and lubricated between the metal strip such as a thin steel strip as a material to be rolled and the roll of a cold rolling mill. In order to cool, lubricating oil is supplied to the surface of the metal strip on the entry side of the rolling mill, the roll bite, or the roll surface.

  As a lubrication facility for such a cold rolling process, there are mainly a recirculation supply method and a direct supply method, and a hybrid supply method in which both supply methods are mixed. In either method, a lubricating oil emulsion or a lubricating oil stock solution obtained by previously stirring and mixing lubricating oil and water in a lubricating oil tank is applied to the roll bite entering side or the surface of a thin steel strip using a single fluid nozzle. A supplying method is widely applied (for example, see Non-Patent Document 1).

  In this way, the conventional lubrication method adopting the recirculation method or direct method while applying the lubrication supply method that supplies the lubricating oil emulsion or the lubricating oil stock solution to the roll bite or sheet steel strip using a one-fluid nozzle. Although rolling equipment has been the mainstream, in recent years, a method of supplying lubricating oil using a two-fluid nozzle is becoming widespread.

  The two-fluid nozzle is configured to eject while mixing two kinds of fluids. In lubrication in cold rolling, the lubricating oil stock solution is mixed with a gas such as air by a lubrication header having the two-fluid nozzle. By supplying to the roll bite entry side and the sheet steel strip surface, the lubrication amount is much less than when using a single fluid nozzle, and the lubrication is equivalent to or better than the lubrication method using the conventional supply method as described above. It is known that it can exhibit the property (refer patent document 1).

  Furthermore, by adopting a hybrid supply system that supplies a lubricating oil emulsion to the surface of a thin steel strip using a two-fluid nozzle in a tandem mill that employs a recirculation supply system, while maintaining the basic unit of lubricating oil A lubrication supply method that enables stable high-speed rolling has been proposed (see Patent Documents 2 and 3).

By the way, in the conventional lubrication equipment for supplying lubricating oil to the surface of the sheet steel strip at the entrance side of the cold rolling mill, the lubrication header and the lubrication nozzle are provided on the upper surface side and the lower surface side of the sheet steel strip. Lubricating oil is supplied aiming at the upper and lower surfaces of substantially the same part of the sheet steel strip in the rolling direction, being installed approximately symmetrically with respect to the surface of the sheet passing height.
In addition, in a conventional facility for supplying lubricating oil to the surface of a thin steel strip, a method is adopted in which as much lubricating oil as possible is introduced into the roll bite by supplying lubricating oil in the rolling direction.

JP 2006-263740 A Japanese Patent Laid-Open No. 2006-267372 JP 2008-212940 A

"Theory and Practice of Sheet Rolling (Revised)" Japan Steel Association Rolling Theory Group, September 2010, p208

  When supplying lubricating oil to the surface of the sheet steel strip together with a gas such as air using a lubrication header having a two-fluid nozzle, the sheet width direction of the sheet steel strip is prevented so that a portion where the lubricant is not injected is not generated. It is desirable to supply the lubricating oil as uniformly as possible over the entire surface. Therefore, in general, a lubrication header having a so-called flat nozzle in which the cross-sectional shape of the injection cone (three-dimensional shape of the injection flow region of the lubricating oil ejected from the nozzle) is a flat shape, for example, a flat oval shape, The lubrication header is disposed so that the long axis direction of the flat shape of the nozzle is along the plate width direction of the thin steel strip.

  Here, with respect to the spray amount distribution from the nozzle, since the lubricant amount is smaller in the edge portion than in the central portion of the nozzle, the lubricant oil is supplied uniformly over the entire surface of the sheet steel strip in the plate width direction. For this purpose, the lubricating oil must be supplied over a wider range than the plate width. Therefore, the lubricating oil is inevitably supplied from the lubricating header to the outside of the sheet steel strip in the plate width direction.

  By the way, as described above, on the upper surface side and lower surface side of the thin steel strip, it is installed almost symmetrically with the surface of the sheet steel strip through the height of the plate, and the upper and lower surfaces of the thin steel strip are lubricated at the same position. If oil is injected, the injection flow (injection cone) of the lubricating oil injected from the upper and lower lubricating headers collides at a location outside the plate width where there is no thin steel strip. And the oil droplets of the upper and lower jets shockly interfere and coalesce at the location outside the plate width, and the oil droplet flying direction changes, and the oil droplets (the lubrication injected toward the outside in the plate width direction) Oil droplets of oil) scatter and adhere to any part of the upper and lower surfaces of the thin steel strip. As a result, it is not only possible to accurately supply a predetermined lubricant oil above and below the thin steel strip, but also a variation in the amount of lubricant oil supplied in the width direction of the sheet, which makes stable rolling impossible, This may cause uneven wear and seizure of the roll. In addition, the scattered oil droplets of the lubricating oil easily adhere to the mill inside the rolling mill, and the adhering lubricating oil is mixed with iron powder generated by wear and the like to form sludge. It adheres to the surface and causes the surface quality of the product plate to deteriorate.

  On the other hand, if lubricating oil is supplied to the sheet steel strip in a state where the nozzle of the lubrication header is installed in the vertical direction (the inclination angle of the nozzle with respect to the rolling direction is zero), the region along the surface of the moving sheet steel strip In some cases, a moving layer of air is generated to prevent the lubricant from adhering to the surface of the sheet steel strip. In particular, as the sheet feeding speed of the thin steel strip increases, the decrease in the adhesion of the lubricating oil due to the moving layer of air increases. In particular, in the lubrication method in which lubricating oil and gas are supplied simultaneously using a two-fluid nozzle, the supply amount of the lubricating oil itself is much higher than in the lubricating method in which the emulsion is supplied by a lubrication header composed of a one-fluid nozzle. Because there are few lubricants that can be ignored with the lubrication method that supplies the emulsion with a single fluid nozzle, the collision and interference of the lubricant from the upper and lower nozzles and the moving layer of air generated on the surface of the sheet steel strip cannot be ignored. As a result, it is desirable to avoid such a phenomenon as much as possible.

The present invention has been made in the background of the above circumstances, and when a lubricant is jetted and supplied to the upper and lower surfaces of a metal strip at the entrance side of a cold rolling mill using a lubrication header having a two-fluid nozzle, The upper and lower lubricant jets collide and interfere on the outside of the strip in the width direction of the strip, avoiding uneven adhesion and poor adhesion of the lubricant to the metal strip, and evenly distributing the lubricant to the metal strip. Lubricating oil supply method capable of being supplied to the surface of a plate and thereby performing stable lubrication and rolling so that the surface quality of the product plate is kept good and can be operated with high productivity, and It is an object of the present invention to provide a lubrication rolling method using the. At the same time, it is an object to increase the efficiency of attaching the lubricating oil to the thin steel strip, thereby reducing the basic unit of the lubricating oil and improving the working efficiency and the operating rate.

  As a result of various experiments and studies conducted by the present inventors in order to solve the above-described problems, lubricating oil is injected and supplied together with gas onto the upper and lower sides of the metal strip that is the material to be rolled on the entry side of the cold rolling mill. The present invention has found that the above problem can be solved by appropriately installing the upper and lower lubrication headers when the lubrication header having two fluid nozzles is installed and the upper and lower surfaces of the metal strip are lubricated. It came to make.

Specifically, the lubricating oil supply method of the cold rolling mill of the basic aspect (first aspect) of the present invention is as follows:
Lubricating headers each having one or more two-fluid nozzles are arranged on both the upper and lower surfaces of the metal strip to be rolled on the entry side of the cold rolling mill, and lubrication is performed by these upper and lower lubricating headers. In the lubricating oil supply method of a cold rolling mill that supplies oil and gas to both the upper and lower surfaces of the metal strip at the same time,
Of the jet flow area of the lubricating oil sprayed from the upper lubrication header, the spray area on the surface of the metal strip plate at the work side side outside the metal strip plate is S1w,
Of the jet flow area of the lubricating oil sprayed from the upper lubrication header, the spray area on the surface of the metal strip plate through which the drive side is located on the drive side side of the metal strip plate is S1d,
Of the jet flow area of the lubricant sprayed from the lower lubrication header, S2w represents the spray area on the surface of the metal strip plate at the outside of the metal strip plate on the work side.
Of the jet flow area of the lubricating oil sprayed from the lower lubrication header, S2d represents the spray area on the surface of the metal strip plate at the outside of the drive side of the metal strip plate, S2d,
Respectively,
Furthermore, outside the work side, the area of the region where the region of the upper injection area S1w overlaps the region of the lower injection area S2w is S3w,
Outside the drive side, the area of the upper area of the injection area S1d and the lower area of the injection area S2d overlap each other with S3d,
age,
The ratios R1w, R1d, R2w, R2d of the overlapping area with respect to each injection area,
R1w = S3w / S1w × 100 (%)
R1d = S3d / S1d × 100 (%)
R2w = S3w / S2w × 100 (%)
R2d = S3d / S2d × 100 (%)
As for these ratios R1w, R1d, R2w, R2d, the line passing through the center of the injection direction of each of the lubrication headers is perpendicular to the rolling direction so that the largest ratio value is 50% or less. The lubricating oil is supplied by adjusting the angle formed with respect to each other, the spread angle of the jet flow area from each lubricating header nozzle in the rolling direction, and the relative position of the upper and lower lubricating headers in the rolling direction. Is.

In the lubricating oil supply method of the cold rolling mill of such a basic aspect, each of the spray areas S1w and S1d of the lubricating oil on the outer side in the width direction of the metal strip on the surface of the metal strip passing through. , S2w, S2d, the area ratio of the regions S3w, S3d where the upper and lower injection regions overlap is suppressed to 50% or less at maximum. Therefore, the collision and interference of the upper and lower lubricating oil jets on the outer side of the metal strip in the plate width direction are suppressed to the minimum. As a result, it is possible to minimize the oil droplets of the lubricating oil scattered and adhering to the surface of the metal strip or adhering around the rolling mill due to the collision and interference of the upper and lower lubricating oil jets.

The lubricating oil supply method for a cold rolling mill according to the second aspect of the present invention is the first aspect,
Lubricating oil is supplied by adjusting each lubrication header so that the position of the upper lubrication header and the position of the lower lubrication header are shifted in the rolling direction.

In the lubricating oil supply method of the cold rolling mill according to the second aspect, the upper and lower injection regions overlap by shifting the position of the upper lubricating header and the position of the lower lubricating header in the rolling direction. The area ratio of the regions S3w and S3d can be easily suppressed to 50% or less.

Furthermore, the lubricating oil supply method of the cold rolling mill of the third aspect of the present invention is the second aspect,
An angle formed by a line passing through the center of the upper lubrication header nozzle in the injection direction with respect to a vertical plane perpendicular to the rolling direction is α1,
The angle formed by the line passing through the center of the lower lubricating header nozzle in the injection direction with respect to the vertical plane perpendicular to the rolling direction is α2,
The spread angle in the rolling direction of the jet flow area from each lubrication header nozzle is θ,
Wherein each angle [alpha] 1, the [alpha] 2, on the side opposite to the side in the rolling direction and which each adjust at 1/2 within the spread angle theta, is intended to supply the lubricating oil.

  In this third aspect, the angles α1 and α2 of the upper and lower lubricating headers are set to be within ½ of the spread angle θ on the rolling direction side and the opposite side, respectively. This means that the center line of the nozzle of the lubrication header is substantially perpendicular to the plate surface of the metal strip, and lubricating oil is jetted and supplied from each lubrication header to the upper and lower surfaces of the metal strip. Thus, even when the lubricating oil is jetted and supplied almost vertically to the upper and lower surfaces of the metal strip, as described in the second aspect, the position of the upper lubricating header and the position of the lower lubricating header are rolled. By shifting in the direction, the area ratio of the regions S3w and S3d where the upper and lower injection regions overlap can be easily suppressed to 50% or less.

Moreover, the lubricating oil supply method for a cold rolling mill according to the fourth aspect of the present invention is the first or second aspect,
Tilt the upper and lower lubrication headers so that the injection direction from the nozzle is opposite to the rolling direction of the metal strip, and about the inclination,
An angle formed by a line passing through the center of the upper lubricating header nozzle in the injection direction with respect to a vertical plane perpendicular to the rolling direction is α1,
The angle formed by the line passing through the center of the lower lubricating header nozzle in the injection direction with respect to the vertical plane perpendicular to the rolling direction is α2,
The spread angle in the rolling direction of the jet flow area from each lubrication header nozzle is θ,
θ / 2 ≦ α1
α1 + θ / 2 ≦ 60 °,
θ / 2 ≦ α2
α2 + θ / 2 ≦ 60 °
To satisfy, the respective angles [alpha] 1, [alpha] 2, and the adjustment theta, is intended to supply the lubricating oil.

In the fourth aspect, the upper and lower lubrication headers are inclined by an appropriate angle so that the injection direction from the nozzles faces in the opposite direction to the rolling direction of the metal strip. For this reason, since the lubricating oil is injected and supplied so that the jet flow of the lubricating oil collides with the surface of the thin steel strip that continuously moves when the plate is passed, the collision speed of the lubricating oil drops increases and the collision frequency increases. As a result, the adhesion efficiency of the lubricating oil to the surface of the metal strip is improved.
In this case, by appropriately adjusting the inclination angle of the upper and lower lubricating headers within the above range, the area ratio of the regions S3w and S3d where the upper and lower injection regions overlap can be easily suppressed to 50% or less. . Of course, as described in the second aspect, the position of the upper lubrication header and the position of the lower lubrication header may be shifted in the rolling direction simultaneously with the adjustment of the tilt angle. .

Furthermore, the lubricating oil supply method of the cold rolling mill of the fifth aspect of the present invention is the first or second aspect,
The angle of spread in the rolling direction of the spray area from each of the lubricating header nozzles is θ,
In addition, regarding any one of the upper and lower lubrication headers, αq is an angle formed by a line passing through the center of the injection direction of the one lubrication header nozzle with respect to a vertical plane perpendicular to the rolling direction, and the angle αq Each within a half of the spread angle θ on the side in the rolling direction and the side opposite thereto,
In addition, the other lubricating header of the upper and lower lubricating headers is tilted so that the injection direction from the other nozzle is opposite to the rolling direction of the metal strip, and the inclination of the other nozzle is as follows. Αp is an angle formed by a line passing through the center of the injection direction with respect to a vertical plane perpendicular to the rolling direction,
θ / 2 ≦ αp
αp + θ / 2 ≦ 60 °
The lubricating oil is supplied by adjusting the angles αp, αq, and θ so as to satisfy the above.

  In the fifth aspect, one of the upper and lower lubricating headers is arranged substantially vertically as described in the third aspect, and the other lubricating header is described in the fourth aspect. Thus, it is inclined by an appropriate angle on the opposite side with respect to the rolling direction. Also in this case, the area ratio of the regions S3w and S3d where the upper and lower injection regions overlap can be easily reduced to 50% or less by shifting the positions of the upper and lower lubrication headers in the rolling direction or adjusting the inclination angle. Can be suppressed.

The lubrication rolling method of the sixth aspect of the present invention is
Applying the lubricating oil supply method of the cold rolling mill according to any one of the first to fifth aspects, the metal sheet is cooled while lubricating the upper and lower surfaces of the metal strip at the entrance side of the cold rolling mill. During rolling,
The gas injection pressure per nozzle is set to 0.001 MPa or more and 1 MPa or less, and the gas supplied from the nozzle of the lubrication header with respect to the value of the passing speed of the metal strip (V (m / min)). Cold rolling is performed while gas is supplied to the surface of the metal strip together with lubricant so that the pressure value (P (MPa)) is 1/5000 times or more.

  In such a lubricating rolling method of the sixth aspect, by determining the gas injection pressure per nozzle as described above, excess lubricating oil can be reliably and without adhering to the sheet steel strip or the periphery of the mill. Lubricating oil can be sufficiently supplied to the surface of the sheet steel strip. Moreover, if the pressure of the gas supplied from the nozzle of the lubrication header is set as described above, the lubrication oil is hindered by the fluidized layer of air on the surface of the thin steel strip generated in the plate, and the lubrication oil is sufficiently supplied. It is possible to avoid a situation where it is difficult to adhere to the steel plate.

  According to the present invention, a lubrication header having a two-fluid nozzle for supplying and supplying lubricating oil together with a gas is installed above and below a metal strip such as a thin steel strip as a material to be rolled on the entry side of the cold rolling mill. When lubricating the upper and lower surfaces of the metal strip, the lubricant is prevented from adhering unevenly in the width direction of the thin steel strip due to the collision of the lubricant injected from the upper and lower sides. In addition, the sheet steel strip can be supplied uniformly in the rolling direction, and as a result, the effect of enabling stable lubrication rolling can be achieved, and the adhesion efficiency of the lubricating oil to the sheet steel strip can be increased. As a result, it is possible to obtain the effect of reducing the basic unit of lubricating oil and improving the operation index such as work rate and operation rate.

1 is a schematic front view showing a first embodiment of a lubricating oil supply method for a cold rolling mill according to the present invention. FIG. 2 is a schematic side view taken along line II-II in FIG. 1. FIG. 3 is a schematic plan view taken along the line III-III in FIG. 2. FIG. 4 is a schematic plan view at a position according to FIG. 3 when the upper and lower injection regions partially overlap. It is a figure for showing the 1st example of the upper and lower lubricating oil injection situation in a 1st embodiment from the side, and is the rough solution figure equivalent to the principal part in FIG. It is a figure for showing the 2nd example of the upper and lower lubricating oil injection situation in a 1st embodiment from the side, and is a rough solution figure according to Drawing 5A. It is a rough front view which shows 2nd Embodiment of the lubricating oil supply method of the cold rolling mill of this invention. It is a figure for showing the 1st example of the upper and lower lubricating oil injection situation in a 2nd embodiment from the side, and is a rough solution figure equivalent to the important section in Drawing 6. It is a figure for showing the 2nd example of the upper and lower lubricating oil injection situation in a 2nd embodiment from the side, and is a rough solution figure according to Drawing 7A. It is a figure for showing the 3rd example of the up-and-down lubricating oil injection situation in a 2nd embodiment from the side, and is a rough solution figure according to Drawing 7A. It is a figure for showing the 4th example of the upper and lower lubrication oil injection situation in a 2nd embodiment from the side, and is a rough solution figure according to Drawing 7A. FIG. 5 is a schematic plan view at a position according to FIG. 4 for illustrating another method for shifting the upper and lower injection regions. It is a rough front view which shows the principal part of 3rd Embodiment of the lubricating oil supply method of the cold rolling mill of this invention.

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

1 to 3 show a lubricating oil supply facility according to a first embodiment of the present invention.
1-3, about the cold rolling mill 1 for rolling a metal strip, for example, the thin steel strip 2, only the upper and lower work rolls 1A and 1B are shown, and the backup roll and the intermediate roll are omitted. In addition, a guide roller that supports the thin steel strip 2 before and after the work rolls 1A and 1B is also omitted. In the present invention, any type of rolling mill such as a four-fold cold rolling mill or a six-fold cold rolling mill, a 12-stage cluster type cold rolling mill, a 20-stage Sendier cold rolling mill, etc. Is also applicable.
Lubricating oil is supplied to the upper and lower surfaces of the thin steel strip 2 on the upper and lower surfaces of the sheet steel strip 2 facing the entry side of the upper and lower work rolls 1A and 1B, that is, toward the entry side of the roll tool 3, respectively. An upper lubrication header 41 and a lower lubrication header 42 are provided. These lubrication headers 41 and 42 have a two-fluid nozzle that ejects a gas such as air together with the lubricating oil. As the nozzle, a so-called flat nozzle is used in which the cross-sectional shape of the injection cones (three-dimensional shape of the jet region of the lubricating oil jetted from the nozzle) 51, 52 is a flat shape, for example, a flat oval shape. The flat major axis direction is arranged along the plate width direction of the thin steel strip 2.

  Here, the lubrication headers 41 and 42 for supplying the lubricating oil to the upper and lower surfaces of the thin steel strip 2 are installed at positions separated from each surface of the thin steel strip 2 by a certain distance, and the angle of the header is set to be equal to that of the thin steel strip. It is configured to be inclined with respect to the rolling direction (movement direction) P. The angle adjustment can be set separately for the upper and lower lubrication headers 41 and 42. Further, the installation positions of the upper and lower lubrication headers 41 and 42 in the direction along the rolling direction P, that is, the distance from the center of the work rolls 1A and 1B of the rolling mill can be adjusted. 41 and 42 can be set to the same distance, or can be set to be shifted to different positions. In this case, the shifting direction may be such that the upper lubricating header 41 is closer to the rolling mill 1 than the lower lubricating header 42 or may be further away. The lubrication headers 41 and 42 are fixed at a certain distance from each surface of the thin steel strip 3, but the distance may be different between the upper and lower lubrication headers. Further, the nozzle tips attached to the lubrication header 41 may be different between the upper and lower lubrication headers 41 and 42.

  In ordinary cold rolling of sheet steel strip, not only the lubricating oil is supplied to the surface of the steel strip on the rolling mill entrance side, but also the lubricating oil emulsion is often supplied to the roll bite and the roll surface. Even when cold rolling is performed by applying the invention, a lubricating oil emulsion is often supplied to a roll bite, etc., but in FIG. 1, equipment for supplying the lubricating oil emulsion to a roll bite is omitted. Yes. In carrying out the present invention, any type of conventional lubrication equipment that is jetted and supplied toward a roll bite or roll surface of a rolling mill that has been conventionally provided may be applied.

In the first embodiment shown in FIGS. 1 to 3, the upper lubrication header 41 is shifted by a distance L to the side away from the work rolls 1 </ b> A and 1 </ b> B as compared to the lower lubrication header 42. In addition, the installation angles α1 and α2 of the upper and lower lubrication headers 41 and 42 are inclined to the opposite side of the rolling direction P by an equal angle vertically (α1 = α2).
The situation of the lubricating oil injection flow areas 51 and 52 from the upper and lower lubricating headers 41 and 42 as viewed along the rolling direction P in the first embodiment shown in FIG. 1 is shown in FIG. The situation of the lubricating oil injection flow areas 51 and 52 from the upper and lower lubricating headers 41 and 42 as seen on the surface S is shown in FIG. 2 and 3, DS indicates the drive side of the sheet steel strip 2 that is continuously passed through, and WS indicates the work side of the sheet steel strip 2 that is continuously passed through.

As already described, in order to uniformly supply the lubricating oil over the entire surface of the sheet steel strip in the width direction, the lubricating oil must be supplied over a wider range than the width of the sheet. Also, the lubricating oil is sprayed from the lubricating header. That is, as shown in FIGS. 2 and 3, the lubricating oil injection flow areas 51 and 52 from the upper and lower lubrication headers 41 and 42 have a plate width of the thin steel strip 2 on the surface S of the plate passing height. From the inside, it is in a state of protruding to the outside of the plate width on the drive side DS side and the outside of the plate width on the work side WS side.
Here, in the lubricating oil injection flow area 51 from the upper lubrication header 41, the injection area on the inner side of the plate width of the sheet steel strip 2 on the surface S of the plate passing height is 51o, and the injection on the outer side on the drive side DS side The region is 51d, and the outer injection region on the work side WS side is 51w. Further, in the lubricating oil jet flow area 52 from the lower lubrication header 42, the jet area inside the plate width of the thin steel strip 2 on the surface S having the plate passing height is 52o, and the jet area outside the drive side DS is 52o. Is 52d, and the outside injection area on the work side WS side is 52w. In FIG. 3, the upper and lower DS side and WS side outer injection regions 51d, 51w, 52d, and 52w are hatched.

  In the case of the present embodiment, as described above, the upper lubricating header 41 is shifted from the position of the lower lubricating header 42 by a distance L in a direction away from the work rolls 1A and 1B (opposite to the rolling direction P). In addition, since the installation angles α1 and α2 of the upper and lower lubrication headers 41 and 42 are inclined to the opposite side of the rolling direction P by an equal angle in the vertical direction, the surface S of the plate passing height is as shown in FIG. In addition, the upper and lower injection cones (injection flow areas) 51 and 52 do not collide. That is, in the lubricating oil jet flow area 51 from the upper lubrication header 41, the outer side area 51d on the drive side DS side and the outer side area 51w on the work side WS side in the surface S of the plate passing height are the lower side. In the lubricating oil jet flow area 52 from the lubrication header 42, the outer side area 52d on the drive side DS side and the outer area 52w on the work side WS side in the surface S of the plate passing height are not overlapped. Therefore, collision between the upper and lower lubricating oil jets and interference do not occur outside the width of the thin steel plate at the plate passing position. Therefore, it is effective that the lubricating oil scatters due to collision and interference between the upper and lower lubricating oil jets, and extra oil droplets adhere to the surface of the steel strip or oil droplets adhere around the rolling mill. Can be prevented.

  In the first embodiment shown in FIGS. 1 to 3 described above, the lubricating oil injection flow area 51 from the upper lubricating header 41 and the lubricating oil injection flow area 52 from the lower lubricating header 42 are passed through. The positions and inclinations of the upper and lower lubrication headers 41 and 42 in the rolling direction are adjusted so that they do not overlap at the height surface S at all. If the ratio of the area of the overlapping portion of the upper and lower jet flow areas 51 and 52 is a small value of a certain level or less, the collision and interference of the upper and lower lubricant jets outside the sheet width of the thin steel plate at the plate passing position are minimized. Thus, the above-mentioned problems due to interference and collision can be avoided. Next, the area ratio of such overlapping portions will be described with reference to FIG.

  FIG. 4 shows a situation where the lubricating oil injection flow area 51 from the upper lubrication header and the lubricating oil injection flow area 52 from the lower lubrication header partially overlap on the surface S of the plate height. Following the above. That is, the outer injection region 51d on the drive side DS side and the outer injection region 51w on the work side WS side in the through-plate height surface S are respectively in the lubricating oil injection flow region 52 from the lower lubrication header 42. The outer injection area 52d on the drive side DS side and the outer injection area 52w on the work side WS side of the surface S of the plate height overlap each other. These overlapping areas (overlapping areas) are cross-hatched in FIG. 4, and the overlapping area on the drive side DS side is indicated by reference numeral 53d, and the overlapping area on the work side WS side is indicated by reference numeral 53w.

Here, in the jet flow area 51 of the lubricating oil sprayed from the upper lubrication header, the injection region 51w on the surface S of the sheet steel strip 2 through which the sheet steel strip 2 has a height outside the work side WS side of the sheet steel strip 2 is shown. Let S1w be the area, and let S1d be the area of the injection region 51d on the surface S of the sheet steel strip 1 on the outside on the drive side DS side.
In addition, in the jet flow area 52 of the lubricating oil sprayed from the lower lubrication header, the injection region 52 w of the sheet steel strip 2 on the surface S of the sheet plate height 2 outside of the thin steel strip 2 on the work side WS side. Let S2w be the area, and let S2d be the area of the injection region 52d on the surface S of the sheet steel strip 2 through which the sheet plate height is outside on the drive side DS side.
Furthermore, the area of the overlapping region 53w where the injection region 51w from the upper side and the injection region 52w from the lower side overlap on the outside of the work side WS is S3w, the injection region 51d from the upper side outside the drive side DS, and the lower side The area of the overlapping region 53d that overlaps the injection region 52d from is defined as S3d.
And the ratios R1w, R1d, R2w, R2d of the overlapping areas S3w, S3d with respect to each injection area S1w, S1d, S2w, S2d,
R1w = S3w / S1w × 100 (%)
R1d = S3d / S1d × 100 (%)
R2w = S3w / S2w × 100 (%)
R2d = S3d / S2d × 100 (%)
It is defined as

  In the present invention, the upper and lower lubricating headers 41 and 42 are arranged so that the largest ratio value among the ratios R1w, R1d, R2w, and R2d of the overlapping areas to the injection areas is 50% or less. . Thus, by limiting the ratio of the overlapping areas to a maximum of 50% or less, the collision and interference of the upper and lower lubricating oil jets on the outer side of the sheet width of the thin steel plate at the plate passing position are minimized, and thereby Thus, problems due to collision and collision of the upper and lower lubricating oil jets can be avoided.

  That is, if any one of the overlapping area ratios R1w, R1d, R2w, R2d of the injection regions of the lubricating oil injected from the upper and lower lubricating headers outside the plate width is greater than 50%, the sheet steel strip passing plate When spraying lubricating oil from above and below, the upper and lower lubricating oil jets collide and the oil droplets become larger, and the direction in which the oil droplets fly changes and scatters and adheres to the surface of the steel strip. Therefore, there is a high risk of causing uneven lubrication (non-uniform adhesion), depositing around the rolling mill, depositing it, and dripping onto the thin steel strip in the plate. On the other hand, if the overlap area ratios R1w, R1d, R2w, and R2d are all 50% or less, the amount of lubricating oil supplied by the two-fluid nozzle is larger than the amount of lubricating oil supplied by the conventional one-fluid nozzle. Since the amount is extremely small, the level of occurrence of uneven lubrication and the amount of lubricating oil adhering and depositing around the rolling mill are almost negligible, that is, less than or equal to the conventional one-fluid nozzle supply method. Become. If there is a degree of freedom in setting the lubrication header installation space and the tilt angle, the ratios R1w, R1d, R2w, and R2d of the overlapping areas of the injection regions are preferably 30% or less at maximum.

  In the present invention, the ratio R1w, R1d, R2w, R2d of the overlapping areas of the injection regions is 50% or less, preferably 30% or less at the maximum, including the case where the ratio of these overlapping areas is 0%. Of course. That is, the situation shown in FIGS. 1 to 3 corresponds to the case where the ratios of these overlapping areas are all 0%.

  Here, it is difficult to actually measure the areas S1d, S1w, S2d, S2w, S3d, and S3w of each injection region in FIG. However, if the cold rolling line is stopped, a transparent acrylic plate or the like is placed on the WS side and DS side of the sheet steel strip to be passed, and lubricating oil is injected from the two fluid nozzles of the upper and lower lubrication headers, these The areas S1d, S1w, S2d, S2w, S3d, and S3w can be observed, and these areas can be easily measured by taking a photograph.

  In order to adjust the ratio R1w, R1d, R2w, R2d of the overlapping area of the lubricating oil injection regions on the outer side in the sheet width direction of the thin steel strip to 50% or less, preferably 30% or less, FIG. As shown in the above, either or both of the method of shifting the positions of the upper and lower lubrication headers 41 and 42 in the rolling direction and the method of adjusting the inclination angle of the upper and lower lubrication headers 41 and 42 are applied. It ’s fine. In this case, the distance between the lubrication header and the thin steel strip may be determined in consideration of the spreading characteristics of the spray cone of the nozzle tip to be used and the equipment layout around the installed rolling mill.

  Here, in the first embodiment shown in FIGS. 1 to 3, the upper and lower lubricating headers 4 </ b> A and 4 </ b> B each having two fluid nozzles are angled α <b> 1 and α <b> 2 on the opposite side of the rolling direction P with respect to the vertical plane Q. In this configuration, the lubricating oil is sprayed together with the gas. Two examples of the situation in which the upper and lower lubrication headers 4A and 4B are inclined to the opposite side of the rolling direction P with respect to the vertical plane Q are shown in an enlarged manner in FIGS. 5A and 5B.

The reason why the upper and lower lubricating headers 4A and 4B are inclined in the opposite direction to the rolling direction P is as follows.
That is, when a lubricating header having a two-fluid nozzle is used to supply the lubricating oil to the thin steel strip in the plate with gas, the upper and lower lubricating headers are installed in the vertical direction and the lubricating oil is sprayed in the vertical direction. Rather than supplying the lubricating oil, the lubricating oil is more efficiently attached when the upper and lower lubricating headers are inclined to the opposite side of the rolling direction P with respect to the vertical plane Q and the lubricating oil is sprayed together with the gas. This is because if the lubricating oil is spray-supplied so that the jet stream of the lubricating oil collides with the surface of the thin steel strip that continuously moves when the plate is passed, the collision speed of the oil droplets of the lubricating oil increases and the collision frequency increases. Because.

In order to effectively increase the collision speed and collision frequency of the oil droplets of the lubricating oil by tilting the upper and lower lubricating headers, it is preferable to satisfy the following conditions.
That is, an angle formed by a line passing through the center of the upper lubrication header nozzle in the injection direction with respect to the vertical plane Q perpendicular to the rolling direction is α1, and a line passing through the center of the lower lubrication header nozzle is in the rolling direction. Α2 is an angle formed with respect to the vertical plane Q perpendicular to the angle Q, and θ is a spread angle in the direction along the rolling direction of the jet flow area from the nozzle of each lubrication header,
θ / 2 ≦ α1
α1 + θ / 2 ≦ 60 °,
θ / 2 ≦ α2
α2 + θ / 2 ≦ 60 °
It is preferable to satisfy these conditions.

  Here, since the nozzle of the lubrication header has a certain injection width in the rolling direction, the injection flow of the lubricating oil must be inclined to the opposite side with respect to the rolling direction in consideration of the injection width. If the angles α1 and α2 formed between the nozzle center line and the vertical direction of the lubrication header are less than ½ of the jet angle θ in the rolling direction of the nozzle, the jet of lubricating oil collides with the surface of the continuously moving sheet steel strip. The effect to do becomes small. Therefore, the angles α1 and α2 are preferably set to θ / 2 or more. However, when (α1 + θ / 2) and (α2 + θ / 2) are larger than 60 °, a phenomenon occurs in which the steel plate rebounds and is less likely to adhere than the steel plate. Therefore, it is preferable to adjust the inclination angles α1 and α2 of the lubrication header within the above angle range. Even within this range, (α1 + θ / 2) and (α2 + θ / 2) are preferably 10 ° or more and 45 ° or less.

  1, FIG. 5A, and FIG. 5B show the case where the inclination angle α1 of the upper lubrication header 41 and the inclination angle α2 of the lower lubrication header 42 are equal. The inclination angles α1 and α2 do not necessarily have to be equal, and can be varied as appropriate.

In FIG. 6, as a second embodiment of the present invention, upper and lower lubrication headers 41 and 42 having two fluid nozzles are arranged with a vertical plane Q in which the nozzle injection direction center line O is orthogonal to the rolling direction P. FIG. 7A shows an example in which the oil is installed so as to be substantially along, and the lubricating oil is injected substantially perpendicularly to the upper and lower surfaces of the thin steel plate 2.
In the second embodiment shown in FIGS. 6 and 7A, the upper and lower lubrication headers 41 and 42 are installed at the same vertical angle in the vertical direction, but the upper lubrication header 41 is replaced with the lower lubrication header 42. Further, the distance L is shifted in the direction away from the work rolls 1A and 1B of the cold rolling mill 1. As a result, as in the case of the first embodiment shown in FIG. 1, the upper and lower injection cones (injection flow areas) 51 and 52 are adjusted so as not to collide with each other in the plane S of the plate passing height. In other words, the lubricant injection flow area 51 from the upper lubrication header 41 and the lubricant injection flow area 52 from the lower lubrication header 42 are adjusted so as not to overlap at all on the surface S of the plate height.

  Also in the second embodiment, as described in the first embodiment, the upper and lower jet flow areas 51 and 52 on the outer side of the plate width on the plane S of the plate passing height are, for example, shown in FIG. 7B. Even if they overlap as shown in Fig. 2, if the overlap area is small, which is less than a certain level, the collision and interference of the upper and lower lubricating oil jets outside the sheet width of the sheet steel at the plate passing position are minimized. Thus, the above-mentioned problems due to interference and collision can be avoided. As a condition for this, as in the first embodiment, the ratio of the overlapping areas S3w, S3d to the injection areas S1w, S1d, S2w, S2d outside the sheet width direction of the sheet steel strip in the plane S of the sheet passing height R1w, R1d, R2w, and R2d may be 50% or less, preferably 30% or less, respectively.

  When the center line O of the nozzles of the lubricating headers 41 and 42 is fixed in the vertical direction as in the second embodiment, the ratio of the overlapping areas described above is suppressed to 50% or less, preferably 30% or less, respectively. For this purpose, the positions of the upper and lower lubrication headers 41 and 42 must be shifted. However, the upper and lower lubrication headers 41 and 42 may be shifted in parallel to the rolling direction, or they may be shifted symmetrically (ie, rotated) with the center of the lubrication headers 41 and 42 as the center of rotation. Also good. An example of each of the injection regions 51w, 51d, 52w, 52d and the overlapping regions 53w, 53d on the surface of the sheet plate height of the thin steel plate 2 when shifted point-symmetrically is shown in FIG. Show. Further, as described above, the method of shifting in the rolling direction and the method of shifting by rotation may be combined.

  Here, as described in the second embodiment, the upper and lower lubrication headers 41 and 42 are installed so that the nozzle injection direction center line O is substantially along the vertical plane Q perpendicular to the rolling direction P. The lubricating oil is injected almost perpendicularly to the upper and lower surfaces of the thin steel strip 2 as shown in FIG. 6 not only when the center line O is strictly along the vertical direction, This includes the case where the line O is slightly inclined with respect to the vertical direction. Two examples in that case are shown in FIGS. 7C and 7D. In this case, similarly to the above, the angle formed by the injection direction center line O of the upper lubrication header nozzle with respect to the vertical plane Q orthogonal to the rolling direction P is α1, and the injection direction center line O of the lower lubrication header nozzle If the angle formed with respect to the vertical plane Q perpendicular to the rolling direction P is α2, and the spread angle of the jet flow area from each lubrication header nozzle in the rolling direction is θ, the angles α1 and α2 are the rolling direction. On the opposite side and on the opposite side thereof, it may be within ½ of the spread angle θ. In other words, if the side in the rolling direction is the minus (−) side and the side opposite to the rolling direction is the plus (+) side, the center line O of the upper and lower lubrication headers is ± θ / It may be within the range of 2.

  When each of the above angles α1, α2 is θ / 2 or more on the + side, as already described in the first embodiment, when each lubrication header is positively inclined to the opposite side with respect to the rolling direction. Equivalent to. On the other hand, when each angle α1, α2 exceeds θ / 2 on the minus side, each lubricating header is positively inclined in the rolling direction, in which case the impact force of oil droplets on the thin steel plate is reduced, The adhesion force becomes small, oil droplets floating without adhering to the thin steel plate increase, and they may adhere to the periphery of the thin steel plate or the rolling mill, leading to a decrease in product quality.

Further, FIG. 9 shows a third embodiment of the present invention.
In the third embodiment, the upper lubrication header 41 is installed so that the nozzle center line O is inclined to the opposite side with respect to the rolling direction P by an angle αp, as in the first embodiment. As in the second embodiment, the lubricating header 42 on the side is an example in which the nozzle center line O is installed along the vertical plane Q (that is, the inclination angle αq = 0). Also in the third embodiment, the ratio of the overlapping areas of the injection regions from the upper and lower lubrication headers 41 and 42 on the outer side in the plate width direction of the thin steel plate 2 on the surface S of the sheet passing position of the thin steel plate 2 is respectively As already described, the adjustment is made so that it is 50% or less, preferably 30% or less. The inclination angle αp of the upper lubrication header 41 preferably satisfies the conditions α1 and α2 described in the first embodiment, and the inclination angle αq of the lower lubrication header 42 is the second embodiment. It is desirable to satisfy the conditions of α1 and α2 described in the embodiment. Also, the upper and lower relationship with FIG. 9 is reversed, and the lower lubrication header 41 is installed so that the nozzle center line O is inclined to the opposite side with respect to the rolling direction P, as in the first embodiment. On the other hand, the upper lubrication header 41 may be installed so that the nozzle center line O is along the vertical plane Q, as in the second embodiment.

  In the present invention, a lubrication header having one or more two-fluid nozzles can be used as the lubrication header. In the case of a lubrication header having two or more two-fluid nozzles, the nozzles do not need to be provided at regular intervals. For example, the nozzle interval is small when it is desired to supply a large amount of lubricating oil, and the nozzle interval is large when it is not. You may do it. Further, two or more lubricated headers having one or two or more two-fluid nozzles may be installed on each of the upper side and the lower side. Further, as the two-fluid nozzle, when a thin steel plate is used, a nozzle having a flat injection cone as described above is preferable, but a nozzle having a round injection cone may be used depending on circumstances. Further, the nozzles of the lubrication header may be arranged so that the flat shapes are aligned in the plate width direction, or may be arranged so that the ends of the injection cones of the individual nozzles do not interfere with each other with a slight angle. good. The point is that the arrangement of the nozzles is arranged so that there is no portion where the lubricating oil is not supplied to the plate surface such as a thin steel strip to be rolled, and the conditions specified in the present invention as described above are satisfied. The form may be determined as appropriate.

  On the other hand, when cold rolling a metal strip such as a thin steel strip by applying the equipment of the present invention, a lubricant having a kinematic viscosity at 40 ° C. of 1 cSt or more and 800 cSt or less is used as the lubricant. It is preferable. When the kinematic viscosity at 40 ° C. is less than 1 cSt, there is a possibility that the lubricity necessary for cold rolling cannot be exhibited even if it is introduced into a roll bite. Further, if the kinematic viscosity at 40 ° C. is larger than 800 cSt, the fluidity in the lubricating oil supply pipe is poor, and the pipe is likely to be clogged. More preferably, it is desirable to use a lubricating oil having a kinematic viscosity at 40 ° C. of 5 cSt or more and 400 cSt or less. Further, as the lubricating oil, a lubricating oil stock solution may be used, or an emulsion in which water and lubricating oil are mixed in advance may be used. Any of them can be used to obtain a required lubricating effect by setting an appropriate supply amount, but it is preferable to use a lubricating oil stock solution in actual operation. Further, the gas ejected together with the lubricating oil from the two-fluid nozzle is arbitrary as long as it is a nonflammable gas such as air, nitrogen, argon, etc., but it is preferable to use air or nitrogen from the viewpoint of cost and ease of supply. .

  The distance from the rolling mill is not particularly limited as long as the lubrication header is installed at the entry side of the cold rolling mill. However, when emulsion is supplied as lubricating oil, the lubricating oil can be supplied to the sheet steel strip at a location about 1 m away from the roll bite inlet of the cold rolling mill in order to increase the time required for plate out. It is desirable to do. In addition to supplying lubricating oil to the surface of the sheet steel strip according to the present invention, in addition to this, when supplying an emulsion as a coolant to the roll tool, the sheet steel is at a position where the emulsion does not come on the surface of the sheet steel strip. It is preferable to supply lubricating oil to the belt. When it is necessary to install a lubrication header at a position where there is a concern that emulsion coolant will come on the sheet steel strip, it is preferable to install a wiper or the like so that the coolant does not come to the location where the lubricant is supplied.

  When performing lubrication rolling using the equipment of the present invention, the pressure of the gas injected from the nozzle is preferably 0.001 MPa or more and 1 MPa or less, more preferably 0.05 MPa or more and 1 MPa or less. . When using a low-viscosity lubricating oil, for example, a lubricating oil having a kinematic viscosity of 30 cSt or less at 40 ° C., the supply of gas at a pressure within the range of 0.001 to 0.1 MPa generates floating mist. And the adhesion efficiency of the lubricating oil is increased. In this case, at a pressure lower than 0.001 MPa, it becomes difficult to give the lubricating oil an initial speed enough to reach the thin steel strip. On the other hand, if injection is performed at a pressure higher than 1 MPa, even if the gas injection direction is angled, the injection flow of the lubricating oil becomes intense and the collision between the lubricating oils is promoted. It often adheres around the mill.

Further, when the thin steel strip passes through, a fluid layer of air on the surface is formed on the surface according to the speed of the thin steel strip. When supplying lubricating oil to the thin steel strip in the plate, it is necessary to break the air moving layer and attach the lubricating oil to the steel plate surface. To achieve this, if the plate speed of the thin steel strip is V (m / min) and the gas pressure P (MPa) from one nozzle to be supplied is
P = V / 5000
It is desirable to perform rolling while supplying the gas together with the lubricating oil at a pressure equal to or higher than the pressure obtained from the above relationship. If the lubricating oil is sprayed and supplied together with the gas at a pressure lower than the gas pressure obtained by the above relational expression, the lubricating fluid will be sufficiently absorbed by the air fluidized layer on the surface of the steel strip generated in the plate. It becomes difficult to make it adhere to a steel plate.

  In order to verify the operation and effect of the present invention, as shown in Experimental Example 1 below, a model experiment was conducted to investigate the adhesion of lubricant to the steel sheet (metal strip) surface, and as shown in Experimental Example 2, A lubrication rolling experiment was conducted using an actual cold rolling mill.

[Experimental Example 1]
Using a winder of a cold rolling experimental apparatus, lubricating oil was sprayed onto the moving steel plate, and the amount of lubricating oil adhering to the steel plate was measured. The roll of the rolling mill was opened so that the steel plate did not contact the work roll. As the steel plate, a coil having a plate thickness of 0.8 mm and a plate width of 380 mm was used. The distance (height) from the tip of the nozzle of the lubrication header to the steel plate surface was 120 mm. As the lubrication header, one having two 2-fluid nozzles installed at an interval of 250 mm was used, and the lubrication header was installed on the upper side and the lower side. The installation conditions of the upper and lower lubricating headers were adjusted so that the injection width of the lubricating oil was wider by 60 mm on both sides than the plate width. Further, the nozzle tip of the lubrication header was replaced, and the amount of adhesion was measured using the ones having an injection angle θ of 5 °, 10 ° and 15 ° in the sheet passing direction (rolling direction) of the steel plate. The amount of adhesion was determined by wiping off the lubricating oil on each of the upper and lower surfaces adhering to an area of 200 mm in the sheet passing direction with respect to the plate width central portion of 100 mm width and both edge 50 mm width, and examining the amount of lubricating oil adhering to the steel plate. Lubricating oil was supplied to each lubricating header by a metered delivery pump. As the lubricating oil, a lubricating oil having a kinematic viscosity at 40 ° C. of 55 cSt is used, and a lubricating oil stock solution is supplied together with air, and an emulsion having a concentration of 10% by volume (mixed with 10% by volume of lubricating oil in water) is air. Two types of conditions were investigated, including the conditions to be supplied together.
The results of examining the amount of lubricating oil adhering to the steel sheet by changing the conditions such as the inclination angle α1, α2 of the lubricating header and the overlapping area outside the width of the lubricating oil supplied from the upper and lower lubricating headers, It shows in Table 1 with conditions.

As is apparent from Table 1, by supplying the lubricating oil according to the present invention, a substantially stable amount of lubricating oil can be obtained, and there is almost no unevenness in the amount of lubricating oil adhering between the center portion of the plate width and the edge portion. Was confirmed. On the other hand, if rolling is performed under the conditions of the comparative example instead of the present invention, lubricating oil unevenness in the vicinity of the edge portion larger than 0.1 cc / m ² is generated, which makes it partially slippery. It was confirmed that accidents were likely to occur, resulting in a decrease in product surface quality and productivity.

[Experimental example 2]
Of the 5 stands of the actual tandem cold rolling mill, prepare a lubrication header with two fluid nozzles arranged at intervals of 150 mm on the entrance side of the # 4 rolling mill, 1.5 m away from the roll center of the # 4 stand Installed a lubrication header. The distance from the steel plate to the nozzle tip was 150 mm, and a two-fluid nozzle with a flat injection cone was installed in the lubrication header. The nozzle has an injection angle θ in the rolling direction of 5 °. As the lubricating oil, one having a kinematic viscosity of 70 cSt at 40 ° C. was used, and the lubricating oil stock solution was supplied to the upper and lower surfaces of the steel sheet together with air. The material used for rolling was carbon steel having a carbon content of 0.02 wt%. The # 4 stand had an inlet side plate thickness of about 1.2 mm, an outlet side plate thickness of about 0.9 mm, and a plate width of about 1180 mm. The nozzle was arranged so that the lubricating oil sprayed from the lubricating header was supplied to a width of about 1400 mm wider than the plate width at the plate passing position of the steel plate. The inlet / outlet tension was about 170 MPa, and the amount of lubricating oil supplied was 15 cc per minute per nozzle. Under these conditions, lubrication rolling is performed by changing the rolling speed, the inclination angle of the lubrication header, and the air pressure, and the friction coefficient is calculated back from the rolling data using the Orowan rolling analysis model. In addition to evaluation, the occurrence rate of squeezing near the edge due to uneven lubrication was investigated. The results are shown in Table 2.

  As is apparent from Table 2, by applying the present invention, uniform and stable adhesion of lubricating oil becomes possible, a good friction coefficient reduction effect can be obtained, and the occurrence of squeezing at the edge portion can also be reduced. confirmed.

  The preferred embodiments and experimental examples of the present invention have been described above. However, these embodiments and experimental examples are merely examples within the scope of the gist of the present invention, and do not depart from the gist of the present invention. Thus, addition, omission, replacement, and other changes of the configuration are possible. That is, the present invention is not limited by the above description, is limited only by the scope of the appended claims, and can be appropriately changed within the scope.

DESCRIPTION OF SYMBOLS 1 Cold rolling mill 1A, 1B Work roll 2 Sheet steel strip (metal strip)
41 Upper lubrication header 42 Lower lubrication header 51 Injection cone from upper lubrication header (injection flow area)
52 Injection cone from lower lubrication header (injection basin)
51w Outer injection region 51d on the work side in the plane of the through plate height in the upper injection flow region 51d Outer injection region 52w on the drive side in the surface of the through plate height in the upper injection flow region In the jet flow area, the outer injection area 52d on the work side side in the plane of the through-plate height, in the lower jet flow area, the injection area 53w on the drive side side in the plane of the through-plate height of the through-plate height Overlap area 53d of the upper and lower injection areas on the outer side of the work side in the plane Overlap area of the upper and lower injection areas on the outer side of the drive side in the plane of the sheet passing height WS Work side DS Drive side P Rolling direction S Height surface O Nozzle centerline Q of each lubrication header Vertical surface

Claims (6)

Lubricating headers each having one or more two-fluid nozzles are arranged on both the upper and lower surfaces of the metal strip to be rolled on the entry side of the cold rolling mill, and lubrication is performed by these upper and lower lubricating headers. In the lubricating oil supply method of a cold rolling mill that supplies oil and gas to both the upper and lower surfaces of the metal strip at the same time,
Of the jet flow area of the lubricating oil sprayed from the upper lubrication header, the spray area on the surface of the metal strip plate at the work side side outside the metal strip plate is S1w,
Of the jet flow area of the lubricating oil sprayed from the upper lubrication header, the spray area on the surface of the metal strip plate through which the drive side is located on the drive side side of the metal strip plate is S1d,
Of the jet flow area of the lubricant sprayed from the lower lubrication header, S2w represents the spray area on the surface of the metal strip plate at the outside of the metal strip plate on the work side.
Of the jet flow area of the lubricating oil sprayed from the lower lubrication header, S2d represents the spray area on the surface of the metal strip plate at the outside of the drive side of the metal strip plate, S2d,
Respectively,
Furthermore, outside the work side, the area of the region where the region of the upper injection area S1w overlaps the region of the lower injection area S2w is S3w,
Outside the drive side, the area of the upper area of the injection area S1d and the lower area of the injection area S2d overlap each other with S3d,
age,
The ratios R1w, R1d, R2w, R2d of the overlapping area with respect to each injection area,
R1w = S3w / S1w × 100 (%)
R1d = S3d / S1d × 100 (%)
R2w = S3w / S2w × 100 (%)
R2d = S3d / S2d × 100 (%)
As for these ratios R1w, R1d, R2w, R2d, the line passing through the center of the injection direction of each of the lubrication headers is perpendicular to the rolling direction so that the largest ratio value is 50% or less. The lubricating oil is supplied by adjusting the angle formed with respect to each other, the spread angle of the jet flow area from each lubricating header nozzle in the rolling direction, and the relative position of the upper and lower lubricating headers in the rolling direction. Lubricating oil supply method for cold rolling mill. In the cold oil rolling mill lubricating oil supply method according to claim 1,
A lubricating oil supply method for a cold rolling mill that supplies lubricating oil by adjusting each lubricating header so that the position of the upper lubricating header and the position of the lower lubricating header are shifted in the rolling direction. In the cold rolling mill lubricating oil supply method according to claim 2,
An angle formed by a line passing through the center of the upper lubricating header nozzle in the injection direction with respect to a vertical plane perpendicular to the rolling direction is α1,
The angle formed by the line passing through the center of the lower lubricating header nozzle in the injection direction with respect to the vertical plane perpendicular to the rolling direction is α2,
The spread angle in the rolling direction of the jet flow area from each lubrication header nozzle is θ,
Wherein each angle [alpha] 1, the [alpha] 2, the side and the side opposite to that of the rolling direction, each of the divergence angle θ and adjusted by within 1/2 of the lubricating oil supply of the cold rolling mill supplies lubricating oil Way . In the lubricating oil supply method of the cold rolling mill of Claim 1 or Claim 2,
Tilt the upper and lower lubrication headers so that the injection direction from the nozzle is opposite to the rolling direction of the metal strip, and about the inclination,
An angle formed by a line passing through the center of the upper lubricating header nozzle in the injection direction with respect to a vertical plane perpendicular to the rolling direction is α1,
The angle formed by the line passing through the center of the lower lubricating header nozzle in the injection direction with respect to the vertical plane perpendicular to the rolling direction is α2,
The spread angle in the rolling direction of the jet flow area from each lubrication header nozzle is θ,
θ / 2 ≦ α1
α1 + θ / 2 ≦ 60 °,
θ / 2 ≦ α2
α2 + θ / 2 ≦ 60 °
To satisfy, the respective angles [alpha] 1, [alpha] 2, and the adjustment theta, cold rolling mill lubricant supply method for supplying lubricating oil. In the lubricating oil supply method of the cold rolling mill of Claim 1 or Claim 2,
The spread angle in the rolling direction of the spray area from each lubrication header nozzle is θ,
In addition, regarding any one of the upper and lower lubrication headers, αq is an angle formed by a line passing through the center of the injection direction of the one lubrication header nozzle with respect to a vertical plane perpendicular to the rolling direction, and the angle αq Each within a half of the spread angle θ on the side in the rolling direction and the side opposite thereto,
In addition, the other lubricating header of the upper and lower lubricating headers is tilted so that the injection direction from the other nozzle is opposite to the rolling direction of the metal strip, and the inclination of the other nozzle is as follows. Αp is an angle formed by a line passing through the center of the injection direction with respect to a vertical plane perpendicular to the rolling direction,
θ / 2 ≦ αp
αp + θ / 2 ≦ 60 °
A lubricating oil supply method for a cold rolling mill that supplies the lubricating oil by adjusting the angles αp, αq, and θ so as to satisfy the above. In cold rolling a metal strip by applying the lubricating oil supply method for a cold rolling mill according to any one of claims 1 to 5,
The gas injection pressure per nozzle is set to 0.001 MPa or more and 1 MPa or less, and the gas supplied from the nozzle of the lubrication header with respect to the value of the passing speed of the metal strip (V (m / min)). A lubrication rolling method, characterized in that cold rolling is performed while jetting gas to the surface of a metal strip together with lubricating oil so that the pressure value (P (MPa)) is 1/5000 times or more.

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