JPH06190428A - Device for supplying rolling oil - Google Patents

Abstract

PURPOSE:To apply rolling oil on the surface of a strip in rolling with the uniform sticking amount in the whole width direction. CONSTITUTION:With this device for supplying rolling oil, a coolant in the emulsion state is prepared by mixing rolling oil to be fed from a rolling oil tank 1 and hot water which is fed from a hot water tank 5 in a mixing tank 9 and the rolling oil is applied on the surface of the strip by jetting the coolant from a header device 12 on the surface of the strip S in rolling with rolling equipment 13. And an injector 18 is interposed between the mixing tank 9 and the header device 12 and a portion of the coolant which is supplied to the header device 12 with the injector 18 is circulated in the direction of the arrow A through the outlet-side pipe 19.

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. 3 shows a rolling oil supply device called a direct system for supplying the above-mentioned 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 increased 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 similarly 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 increase the header 1.
From 2 the jet is applied to the strip S being rolled by the rolling roll 14 of the rolling mill 13. In addition, not only cold rolling,
In hot rolling as well, rolling oil can be supplied by almost the same operation.

[0006]

However, in the above-mentioned conventional rolling oil supply device, since the distance from the mixing tank 9 to the header device 12 is long, the mixing tank 9
The coolant in the emulsion state prepared in the inside is separated into rolling oil and water before being sent to the header device 12, and as a result, there is a phenomenon that the concentration distribution of the rolling oil becomes nonuniform in the width direction of the header. Occur. In particular, the coolant tends to stay near both ends in the width direction of the header, so that a phenomenon in which the amount of rolling oil adheres increases on the strip surface at the position where the coolant is sprayed from the both ends of the header.

FIG. 4 shows the above-mentioned phenomenon. In this figure, the header device 12 provided in the rolling oil supply device shown in FIG. 3 is provided above and below the header device 12.
The rolling oil concentration distribution of the coolant injected from No. 2 is shown in the width direction of the header 15.

In the figure, 16 is an inlet pipe for supplying the coolant into the header 15, and 17 is a nozzle for injecting the coolant. The coolant used is 1
It is an emulsion in which 4% palm oil and 86% water are mixed, and the coolant is supplied at a flow rate of 8.4 [l / min].
Moreover, it was jetted at a pressure of 1.5 [kg / cm ² ].

As described above, if the amount of the rolling oil deposited on the surface of the strip varies, the extension rate of the strip becomes large and the shape is disturbed in the portion where the amount of the rolling oil adheres excessively. Then, heat streaks will occur on the surface.

The present invention has been made to solve the above-mentioned conventional problems, and it is possible to apply rolling oil to the surface of the strip in a uniform deposition amount over the entire width direction thereof. An object is to provide a supply device.

[0011]

According to the present invention, when a strip is rolled by a rolling mill, rolling oil and other component fluids are mixed in a mixing tank to prepare a mixed fluid, and the mixed fluid is fed from a header device. In a rolling oil supply device which sprays strips and applies rolling oil to the surface thereof, an injector for returning a part of the mixed fluid supplied to the header device is provided between the mixing tank and the header device. The above-mentioned problems are achieved by the provision.

[0012]

In the present invention, the injector is provided between the mixing tank and the header device, and a part of the coolant supplied to the header device is returned to the injector, so that the coolant is circulated by itself. Since it is possible to prevent the rolling oil contained in the coolant from separating, it is possible to always inject the coolant with a uniform concentration distribution. Therefore, it becomes possible to make the amount of rolling oil adhered to the surface of the strip the same over the entire width direction.

[0013]

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

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

In the rolling oil supply system of this embodiment, an injector 18 is provided in the middle of an inlet pipe 16 which connects the mixing tank 9 and the header devices 12 which are provided near the front and back surfaces of the strip S, respectively. The rolling oil supply shown in FIG. 3 except that a part of the coolant supplied to the header device 12 through the inlet pipe 16 can be returned to the injector 18 through the outlet pipe 19 by the injector 18. Substantially the same as the device. Therefore, FIG.
The description of the parts common to the above is omitted.

Next, the operation of this embodiment will be described.

The rolling oil stored in the rolling tank 1 is
The pressure is increased by the pump 2, and the flow rate of the rolling oil is controlled by the flow meter 4 and the flow rate adjusting valve 3 so as to be a predetermined amount, and the rolling oil is sent to the mixing tank 9.

At the same time, the hot water stored in the hot water tank 5 is boosted by the pump 6 and is controlled by the flow meter 8 and the flow rate adjusting valve 7 so that the flow rate of the hot water becomes a predetermined amount. Sent to 9.

In the mixing tank 9, the rolling oil and hot water are stirred by the stirrer 10 to prepare a coolant in an emulsion state, and then the coolant is pumped by the pump 1.
The pressure is increased by 1 and sent out in the direction of the arrow, and the header device 12
Is supplied to the front and back surfaces of the strip S to apply rolling oil.

In the present embodiment, the entire amount of the coolant supplied to the header device 12 by the pump 11 is not injected from the header device 12, but a part thereof is passed through the outlet pipe 19 by the suction effect of the injector 18. Since the coolant is returned to the injector 18, the coolant circulates in the pipe in the direction of arrow A.

Therefore, according to this embodiment, the header device 1
In 2, the rolling oil and water can be prevented from being separated from each other due to the stay of the coolant, so that the concentration of the rolling oil in the width direction of the header 15 can be eliminated.
It is possible to prevent the amount of rolling oil applied from varying across the width of the strip S.

FIG. 2 shows the results obtained when the rolling oil supply device of this embodiment was used and the coolant was injected under the same conditions as in the case of FIG. From this figure, according to the present invention, the rolling oil concentration of the coolant is suppressed to within ± 2% of the set concentration of 14%, and the variation of the rolling oil concentration distribution in the header 15 is greatly improved. You can see that it is done.

FIG. 5 is a sectional view showing a header device of a rolling oil supply system according to the second embodiment of the present invention.

In this embodiment, the header device 12 has a supply pipe 16A for supplying the coolant in the direction of arrow A, and a coolant supplied to the supply pipe 16A, as shown in the enlarged cross section of FIG. 18A for injecting a coolant supplied in the direction of arrow B, and an injector portion 18A for narrowing the flow path of the header to generate a negative pressure, and an arrow from both ends 20, 20 of the header 15. A return pipe 21 for returning the coolant in the C direction,
1 is substantially the same as the first embodiment except that the injector 18 of FIG. 1 is incorporated in the apparatus as an injector portion 18A.

In this embodiment, in the header device 12, first, the coolant flows in from the supply pipe 16A in the direction of arrow A, passes through the injector portion 18A, and then in the direction of both ends 20, 20 as shown by arrow B. Branch to header 1
It is supplied into the nozzle 5 and is ejected from the nozzle 17.

At this time, a negative pressure is generated by being throttled behind the injector portion 18A, so that both ends 20 of the header 15 are
The coolant that has not been injected from the nozzle 17 to the injector portion 18A that communicates with the reference numeral 20 through the return pipe 21 reaches the both ends 20, 20, and is drawn by the negative pressure through the return pipe 21 to the arrow C. It flows in the direction and is returned.

Therefore, since there is no staying portion where the flow velocity is 0 inside the header 15, the coolant is prevented from being separated into water and rolling oil, and the oil is prevented from being accumulated at both ends 20, 20, for example. 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 the coolant in the header device 12, which is arranged facing each other on the upper and lower surfaces of the strip S, to be replaced with the new concentration. Therefore, it takes about 3 seconds, for example. Also, this time can be further shortened by reducing the capacity of the header device.

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

For example, the device configuration for supplying rolling oil and hot water to the mixing tank is not limited to that shown in the above embodiment.

The component fluid other than the rolling oil is not limited to water (warm water).

[0032]

As described above, according to the present invention, an injector is provided between the mixing tank and the header device,
Since a part of the coolant supplied to the header device is made to circulate between the header device and the injector,
It is possible to make the rolling oil concentration distribution uniform in the header width direction, and it is possible to perform good strip rolling.

[Brief description of drawings]

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

FIG. 2 is a diagram showing the effect of the present invention.

FIG. 3 is an explanatory view showing an outline of a conventional rolling oil supply device.

FIG. 4 is a diagram showing defects of the conventional rolling oil supply device.

FIG. 5 is a sectional view showing an essential part of a second embodiment according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rolling oil tank 5 ... Warm water tank 9 ... Mixing tank 10 ... Stirrer 12 ... Header device 13 ... Rolling machine 14 ... Rolling roll 15 ... Header 16 ... Inlet pipe 16A ... Supply pipe 17 ... Nozzle 18 ... Injector 18A ... Injector part 19 ... Outgoing pipe 21 ... Return pipe S ... Strip

Claims (1)

[Claims] 1. When a strip is rolled by a rolling mill, a mixing tank mixes rolling oil with other component fluids to prepare a mixed fluid, and the mixed fluid is jetted from a header device to the strip to produce a surface thereof. In a rolling oil supply device for applying rolling oil to a rolling mill, an injector is provided between the mixing tank and the header device for returning a part of the mixed fluid supplied to the header device. Oil supply device.