JPH06190427A - Device for supplying rolling oil - Google Patents

Abstract

PURPOSE:To change the concentration of rolling oil to be supplied to a strip with high responsiveness. CONSTITUTION:Rolling oil is sucked up from a rolling oil tank 20 with a booster pump 22 and supplied to mixers 30, 30' while executing flow control with gear pumps 24, 24'. Hot water is similarly supplied from a hot water tank 26 to the mixer 30, 30' with a booster pump 28, the coolant is made into the emulsion state by mixing hot water with rolling oil and the coolant is jetted to the strip S which is rolled with rolling rolls 34 of a rolling mill 32 from injector type header devices 36, 36'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling oil supply device, and more particularly to a rolling oil supply device effective for supplying rolling oil to a strip when rolling the strip.

[0002]

2. Description of the Related Art When a metal strip such as a steel plate is rolled by a rolling mill, the friction between the rolling roll of the rolling mill and the strip is reduced to facilitate the processing of the strip or to finish the surface of the strip cleanly. Rolling oil is used for.

FIG. 5 shows a transient type rolling oil supply device called a direct system for supplying the rolling oil to the strip in cold rolling, which is used as follows.

The pressure of the rolling oil stored in the rolling oil tank 1 is raised by the pump 2, and the flow rate of the rolling oil detected by the flow meter 4 is fed back to the flow rate adjusting valve 3 to mix a predetermined amount of rolling oil. Supply to the tank 9. At the same time, the water stored in the water tank 5 is boosted by the pump 6, and the flow rate of the water detected by the flow meter 8 is fed back to the flow rate adjusting valve 7, so that a predetermined amount of water is also mixed in the mixing tank 9 Supply to.

In the mixing tank 9, the supplied rolling oil and water are agitated by the agitator 10 to form, for example, an emulsion-state coolant, and the coolant is pressurized by the pump 11 to be fed from the header 12 to the rolling mill 1.
The strip S being rolled by the third rolling roll 14 is jetted. The rolling oil can be supplied not only by cold rolling but also by hot rolling by substantially the same operation.

However, in the above-mentioned rolling oil supply device, when the rolling conditions such as the type of strip, its thickness, rolling speed, etc. are changed, and it is necessary to change the concentration of the rolling oil accordingly, Since the mixing tank 9 has a large capacity, the concentration of the rolling oil cannot be changed quickly, and therefore the responsiveness is poor.

Further, since the distance from the mixing tank 9 to the header 12 is long, the coolant in the emulsion state formed in the mixing tank 9 may be separated into rolling oil and water by the time it reaches the header 12. . As a result, the amount of the rolling oil applied to the surface of the strip S varies, and the extension rate of the strip becomes large in the portion where the coating amount is excessive, and the shape is disturbed. Heat streaks may occur on the surface of the.

In order to solve the above drawbacks, Japanese Patent Publication No. 63-124 discloses a technique of mixing rolling oil and water immediately before the header.

[0009]

However, the technique disclosed in Japanese Patent Publication No. 63-124 requires a few seconds before jetting from the header to the strip after mixing the rolling oil and water, which is not always sufficient. There is a problem that is not.

In other words, as a recent trend of rolling work, the speeding up is progressing, and particularly in the field of cold rolling, the thickness of the sheet after rolling is decreasing, so that the speed of production is increasing more and more in order to supplement the production amount. Tend to change. Under such a situation of high speed, when the concentration of rolling oil is changed in accordance with the change of rolling conditions, its high responsiveness becomes more and more important.

The present invention has been made to solve the above-mentioned conventional problems. Even when the rolling conditions are changed, the rolling oil concentration of the coolant applied to the strip can be changed with high response, and An object of the present invention is to provide a rolling oil supply device capable of applying a rolling oil in a fixed amount over the entire strip surface.

[0012]

According to the present invention, at least a flow rate of rolling oil is controlled by controlling the number of revolutions in a rolling oil supply apparatus for supplying rolling oil as a mixed fluid to the surface of a strip rolled by a rolling mill. The above object is achieved by a gear pump, a mixer that mixes rolling oil and other component fluids to form a mixed fluid, and an injector-type header device that injects the mixed fluid onto the strip surface. It is a thing.

[0013]

In the present invention, a mixer is provided immediately before the header device which is close to the strip being rolled, and the rolling oil is mixed with another component fluid, for example, water to form an emulsion. By changing the flow rate of at least one of water and water, the concentration of rolling oil can be changed quickly, and since the change in flow rate is made by controlling the rotation speed of the gear pump, it can be changed accurately and quickly. it can.

Further, since the injector type header device is used as the header device, it is possible to prevent the emulsion from being separated into water and oil in the header, and therefore the emulsion in which the rolling oil is mixed at a uniform concentration. Since it is possible to apply the coolant consisting of (3) to the surface of the strip, the amount of the rolling oil adhered to the surface of the strip can be made constant over the whole time.

[0015]

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

FIG. 1 is a schematic configuration diagram showing a rolling oil supply apparatus according to an embodiment of the present invention. The rolling oil supply device of the present embodiment includes a rolling oil tank 20 for storing rolling oil, a booster pump 22 for sucking the rolling oil from the rolling oil tank 20 and for boosting the pressure, and the booster pump 2
The first gear pump 24 for controlling the flow rate of the rolling oil boosted by 2 and the hot water tank 26 in which hot water is stored.
The hot water that is boosted from the hot water tank 26 by the hot water booster pump 28 and sent, and the first gear pump 24.
The first mixer 30 that forms a coolant (mixed fluid) in an emulsion state by mixing with each of the rolling oils whose flow rate is controlled by the rolling mill of the rolling mill 32. And an injector-type first header device for spraying on the upper surface of the strip S to be rolled at 34.

The rolling oil supply device further comprises a second gear pump 24 'for spraying a coolant on the lower surface of the strip S, a second mixer 30' and a second injector type header device 36 '. These are the first
The gear pump 24, the first mixer 30, and the first injector-type header device 36 have substantially the same functions.

As shown in the enlarged view of FIG. 2, the first mixer 30 has a hot water supply passage 40, a rolling oil supply passage 42, and a confluence section for colliding and mixing hot water and rolling oil supplied from these supply passages. 44, and a mixed fluid passage 48 having a cross-section sudden change portion 46 for completely mixing hot water and rolling oil merged at the merging portion 44 into an emulsion state. Exit 50
From the first header device 36 to the next.

The second mixer 30 'also has the same structure as that of the first mixer 30. Similarly, the coolant is sent to the second header device 36'.

Also, the first and second header devices 36, 36 '.
3, the supply pipe 52 for supplying the coolant in the direction of the arrow A and the flow passage of the coolant supplied to the supply pipe 52 are narrowed to generate a negative pressure, as shown in the enlarged view of FIG. Injector portion 54, a header 58 having a nozzle 56 for injecting the coolant supplied in the arrow B direction, and a return pipe 62 for returning the coolant in the arrow C direction from both ends 60, 60 of the header 58. It has and.

Next, the operation of this embodiment will be described.

The rolling oil stored in the rolling oil tank 20 is boosted by the booster pump 22, and then the first and second rolling oils are pressurized.
The flow rate is controlled by the gear pumps 24 and 24 ', and they are sent to the first and second mixers 30 and 30', respectively. In the first and second mixers 30 and 30 ', at the merging portion 44, the rolling oil fed in and the hot water fed from the hot water tank 26 are mixed into an emulsion state, and the coolant in this emulsion state is fed from the outlet 50 to the The coolant is jetted from the nozzle 56 to both the front and back surfaces of the strip S by being sent to the first and second injector type header devices 36 and 36 '.

As shown in FIG. 3, in both of the header devices 36 and 36 ', first, the coolant flows from the supply pipe 52 in the direction of arrow A, passes through the ejector portion 54, and then,
As shown by the arrow B, it branches in the direction of both end portions 60, 60 and is supplied into the header 58 and ejected from the nozzle 56.

At this time, since negative pressure is generated due to the constriction behind the injector portion 54, both ends 60, 6 of the header 58 are formed.
The coolant that has not been injected from the nozzle 56 to the injector portion 54 communicating with 0 through the return pipe 62 is
After reaching both ends 60, 60, the negative pressure is drawn through the return pipe 62, and the negative pressure causes the flow to return in the direction of arrow C.

Therefore, since there is no staying portion where the flow velocity is 0 inside the header 58, the coolant is prevented from being separated into water and rolling oil, and the oil component is prevented from accumulating at, for example, both end portions 60, 60. As a result, It is possible to always apply the coolant having a uniform rolling oil concentration to the strip S.

According to the present embodiment, the change of the coolant concentration is almost completed in the time required for replacing the coolant in the first and second header devices 36 and 36 'with the new concentration from the old concentration. It only takes about 3 seconds. Also, this time is
Further reduction can be achieved by reducing the capacity of the header device.

FIG. 4 is a diagram showing the results when the rolling oil supply system of the present embodiment is applied to tandem cold rolling immediately after exchanging the rolling rolls. As shown in FIG. 4, it can be seen that the conventional rolling speed of the rolling roll immediately after the roll replacement was about 1600 mpm, but it could be improved to 2000 mpm after applying this embodiment. This indicates that the rolling oil is always applied in a constant adhesion amount over the entire width direction on both front and back surfaces of the strip.

The present invention has been specifically described above, but the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the spirit of the invention.

For example, the specific structure of the rolling oil supply device, particularly the mixer and the injector type header device, is not limited to those shown in the above embodiment.

In the embodiment, the flow rate of rolling oil is controlled by the gear pump, but the present invention is not limited to this, and the flow rate of both rolling oil and hot water or only hot water may be controlled.

Further, as the other component fluid other than the rolling oil,
It is not limited to water (warm water).

[0032]

As described above, according to the present invention, the concentration of rolling oil can be changed with good responsiveness, and the coolant in the emulsion state can be prevented from separating into water and oil. Rolling is possible.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a rolling oil supply device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a mixer applied to a rolling oil supply device according to an embodiment.

FIG. 3 is a cross-sectional view showing an injector-type header device applied to a rolling oil supply device according to an embodiment.

FIG. 4 is a diagram showing the effect of the present invention.

FIG. 5 is an explanatory diagram showing a schematic configuration of a conventional rolling oil supply device.

[Explanation of symbols]

 20 ... Rolling oil tank 22, 28 ... Booster pump 24, 24 '... Gear pump 26 ... Hot water tank 30, 30' ... Mixer 32 ... Rolling machine 34 ... Rolling roll 36, 36 '... Injector type header device S ... Strip

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Ken Okamoto Ken 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture Inside the Chiba Works, Kawasaki Steel Co., Ltd. (72) Teruhiro Saito 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture Kawasaki Inside the Chiba Steel Works, Ltd. (72) Fumio Furukaku, 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Works Inside the Chiba Works

Claims (1)

[Claims] 1. A rolling oil supply device for supplying rolling oil as a mixed fluid to the surface of a strip rolled by a rolling mill, a gear pump for controlling at least the flow rate of rolling oil by controlling the number of revolutions, a rolling oil and other components. A rolling oil supply apparatus comprising: a mixer that mixes fluids to form a mixed fluid; and an injector-type header device that injects the mixed fluid onto a strip surface.