JPH0639422A - Device for removing coolant of rolling mill - Google Patents

Abstract

PURPOSE:To provide a device for removing the coolant of a rolling mill by which the scattering of the coolant over a strip is effectively prevented. CONSTITUTION:On the entrance side of the rolling mill, coolant nozzles 15, 16 for spraying coolant are disposed; on the exit side of the rolling mill, air nozzles 21, 22 are disposed by which air is blown to the end part 17 of a roll bite and the end part 19 of a contact part between an upper work roll 5 and an upper auxiliary roll 9; and also along the inner wall of a housing 3, upper and lower collecting parts 24, 25 extending to a rolling direction are arranged. In the tip end parts on the side of the rolls 5 to 11 of the upper and lower collecting parts 24, 25, the upper and lower collecting ports 24a, 25a are each arranged by which the air blown from the air nozzles 21, 22 and the coolant that is blown away by this air are received.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coolant removing device for a rolling mill, and more particularly to a coolant removing device for preventing coolant from scattering on a strip.

[0002]

2. Description of the Related Art Conventionally, in cold rolling of, for example, aluminum or the like, for the purpose of lubrication and roll cooling, a rolling roll and a roll bite (work roll and strip) are introduced from the inlet side of the rolling mill. Coolant is sprayed on the contact part of.

As shown in FIG. 6, this coolant is used for upper and lower work rolls P3 and P5 and upper and lower auxiliary rolls P7 and P.
9 is attached to the hatched area and is scattered by the rotational force of the rolls P3 to P9, or the rolls P3 to P9.
It rolls out from the gap P11 formed by the roll neck P10 of No. 9 and scatters to the delivery side of the rolling mill. Of these, the coolant that has jumped out to the rolling mill exit side from the gap P14 formed by the upper and lower work rolls P3 and P5, that is, the gap P14 near the end of the strip P13, scatters and adheres to the strip P13. In addition, the end portion P of the contact portion of both rolls P3 and P7
The coolant accumulated in 15 leaches and stays in the central part (the upper part of the strip P13) P17 of the contact portion between the rolls P3 and P7, and finally falls onto the strip P13. Further, a part of the coolant leaches from the end portion P19 of the roll bite P18 to the rolling mill exit side and strips P13.
Adhere to.

The coolant that has adhered to the strip P13 through the above-described path causes defects such as oil stains in the next step, and therefore must be removed from the strip P13. Therefore, as a method for removing the coolant from the strip, the following method has been conventionally adopted.

For example, a method is known in which air is blown toward the strip from an air nozzle to blow off the coolant attached to the strip. However, blowing off the coolant once adhering to the strip is a method with poor removal efficiency in spite of requiring a large amount of air at high speed and high pressure. Further, as disclosed in Japanese Patent Application Laid-Open No. 50-77258, there is a report that air is blown to both ends of the strip to improve the removal efficiency. However, even if the removal efficiency is increased, the central portion of the strip is still removed. It is difficult to remove the coolant adhering to the.

Therefore, in order to solve the above problems,
As shown in FIG. 6, the air nozzle P2 extends from the end portion P19 of the roll bite P18 and the roll center portion of the contact portion between the upper work roll P3 and the upper auxiliary roll P7 toward the end portion P15.
The air is blown from 1 to blow back the coolant that is about to be scattered on the strip P13 to prevent the coolant from being scattered on the strip P13. In this method, the coolant scattered from the gap P14 near the end of the strip P13 and the central portion P17 of the contact portion between the upper work roll P3 and the upper auxiliary roll P7 and the coolant leaching from the end P19 of the roll bite P18 are aired. It is focused on that it is possible to prevent the coolant itself from scattering on the strip P13 by blowing back by.

However, even in the method of preventing the splash of the coolant on the strip P13 by blowing the coolant back using the air as described above, when the air pressure blown out from the air nozzle P21 is large, the coolant is rather discharged. There is a problem in that the effect of air blowing is reduced when the air scattering is increased and conversely the air pressure is low. Particularly, at the time of high speed rolling, the kinetic energy of the coolant attached to the rolls P3 to P9 is large and the splash of the coolant is increased at the end portion P15, but the air blowing is limited as described above, so that a sufficient effect is obtained. Sometimes it didn't appear.

The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a coolant removing device for a rolling mill, which can prevent the splash of the coolant on the strip more efficiently.

[0009]

The present invention for achieving the above object is to blow air outward from the rolling mill outlet side toward the contact portion between the roll bite and / or the work roll and the auxiliary roll. In the coolant removing device of the rolling mill equipped with the air nozzle that blows off the coolant,
Near the end of the roll bite on the delivery side of the rolling mill and / or near the end of the contact portion between the work roll and the auxiliary roll, and on the downstream side of the air flow by the air nozzle,
A gist of a coolant removing device of a rolling mill is provided with a recovery port for receiving the coolant removed by the air nozzle.

Here, the air nozzle may be located near the end of the contact portion between the roll bite and / or the work roll and the auxiliary roll, or may be located in the central portion.

[0011]

The inventors of the present invention have diligently studied the cause of the insufficient effect of the method for preventing the coolant from scattering on the strip as shown in the prior art. As a result, the flow of blown air in the housing is large. It became clear that it had an effect.

FIG. 7 is a diagram showing the flow of blown air in the housing. As shown by the arrow in the figure, the air blown from the air nozzle P21 is
It hits the inner wall of 2 and swirls in the housing P2 to generate a flow again onto the strip P13. This flow of air entrains the once blown coolant or the coolant scattered from the roll neck P10 to the delivery side of the rolling mill, and scatters the coolant toward the strip P13.

Therefore, in the present invention, air is blown out by the air nozzle to blow off the coolant that is about to be scattered on the strip, and at the vicinity of the end of the roll bite on the delivery side of the rolling mill and / or the contact portion between the work roll and the auxiliary roll. A recovery port is provided near the edge of the air nozzle and downstream of the air flow from the air nozzle to collect the coolant removed by the air nozzle. The recovery port collects the blown coolant and collects the blown air. To do.

As a result, the swirling air current as shown in FIG. 7 is not generated in the housing, and the air blown from the air nozzle does not scatter the coolant on the strip.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a front view showing a rolling mill provided with the coolant removing device of the embodiment, FIG. 2 is a side view of the rolling mill seen from the delivery side of the rolling mill, and FIG. 3 is a plan view of the same.

As shown in FIGS. 1 to 3, in the rolling mill 1 of the first embodiment, upper and lower work rolls 5 and 7 and upper and lower auxiliary rolls 9 and 11 for rolling are supported in a gate-shaped housing 3. Further, in order to scrape off the coolant adhering to the upper auxiliary roll 9, a wiper roll 13 that is in contact with the upper auxiliary roll 9 is provided on the rolling mill entrance side (left side in FIG. 1).

Coolant nozzles 15 and 16 for spraying the coolant to the upper auxiliary roll 9 and the roll bite 14 on the rolling mill entrance side are arranged on the rolling mill entrance side for removing heat generated during rolling and lubrication. It is set up. Further, on the rolling mill exit side, in order to prevent the coolant from scattering on the strip 27, the roll bite end portion 17 on the rolling mill exit side and the end portion of the contact portion between the upper work roll 5 and the upper auxiliary roll 9 are provided. Air nozzles 21 and 22 for blowing air toward 19 are provided.

Further, on the delivery side of the rolling mill, there is provided a recovery section 23 extending along the inner wall of the housing 3 in the rolling direction. The collecting unit 23 is divided into upper and lower collecting units 24 and 25, each of which is a tubular body in which thin plate materials are combined vertically and horizontally. Then, the rolls 5 to 1 of the upper and lower collecting portions 24 and 25
Upper and lower collection ports 24a, 25a for receiving the air blown from the air nozzles 21, 22 and the coolant blown off by the air at the tip portion on the first side.
Are provided respectively.

In the upper recovery port 24a, a lower plate portion 24d is extended to the rolls 5 and 9 side so that blown air and coolant can be easily received, and the outer side plate portion 24b also has an upper work roll 5 and an upper auxiliary roll. It is protruding like a wedge toward the gap of 9. For the same purpose, the lower recovery port 25a
Also, the outer side plate portion 25b, the upper plate portion 25c, the lower plate portion 25d
Extends to the rolls 5 to 11 side longer than the inner side plate portion 25e.

The upper recovery port 24a is disposed downstream of the air flow of the air nozzle 21 and near the end 19 of the contact portion between the work roll and the auxiliary roll. Further, the lower recovery port 25a is arranged on the downstream side of the air flow of the air nozzle 22, and is arranged near the end part 17 of the roll bite.

The opening areas of the upper and lower collection ports 24a, 25a are sufficiently larger than the opening areas of the blowing ports of the air nozzles 21 and 22 so that the air and the coolant blown out from the air nozzles 21 and 22 can be collected without omission. It is taken big. Next, the operation of the rolling mill 1 of this embodiment will be described with reference to FIG. In addition, FIG. 4A shows a rolling mill 1.
4B is a side view of the same as seen from the delivery side of the rolling mill.

As shown in FIG. 4, the rolling mill 1 has upper and lower work rolls 5 and 7 and upper and lower auxiliary rolls 9 and 1 during rolling work.
1 rotates in the directions of arrows a, b, c and d, respectively, to feed the strip 27 in the direction of arrow A for rolling, and at the entrance side of the rolling mill, from the coolant nozzles 15 and 16 to the roll bite 14 and the upper auxiliary. The coolant 31 is sprayed toward the roll 9.

On the other hand, on the delivery side of the rolling mill, the air nozzle 2
Air is blown from the ends 1 and 22 toward the roll bite end portion 17 and the end portion 19 of the contact portion between the upper work roll 5 and the upper auxiliary roll 9 to blow off the coolant to be scattered on the strip 27. Then, the blown-off coolant and the air nozzles 21 and 2 are blown together.
The upper and lower collection ports 24 follow the locus indicated by an arrow (indicated by a broken line)
It is led to the upper and lower collection parts 24 and 25 from a and 25a.

Therefore, in this embodiment, the upper and lower collection ports 24
By providing a and 25a, the air nozzles 21 and 2 are
The air blown from 2 does not generate an air flow that swirls in the housing 3 and returns to the top of the strip 27, and the coolant that has been once blown or the coolant that has scattered from the roll necks 35 to 41 winds up in this air flow. It will not be deposited on the strip 27.

Next, a second embodiment of the present invention will be described. As shown in FIG. 5, the rolling mill 50 of the second embodiment is a rolling mill of substantially the same configuration as the first embodiment, but a cover 55 is provided near the recovery port 51a of the upper recovery part 51. First in point
It differs from the embodiment.

The cover 55 is made of a thin plate material. The cover 55 is connected vertically to the upper plate portion 51b of the upper collecting portion 51 and the main portion 55a, and is connected to the inside of the rolling mill. It is composed of a side edge portion 55b extending to the lower end of the side plate portion 51c inside the recovery portion 51. The main portion 55a is installed so as to be slightly oblique to the axial direction of the upper auxiliary roll 56, and the edge portion 55b is bent with respect to the main portion 55a so as to cover the gap between the upper auxiliary roll 56 and the main portion 55a. Is attached to.

Next, the function of the cover 55 will be described. When the cover 55 is not provided, as shown in FIG. 4, the coolant scattered from the roll neck 39 of the upper auxiliary roll 9 in the rolling mill delivery side is indicated by an arrow B (indicated by a chain line) in the upper recovery portion 24. It may fall onto the upper plate portion 24c, bounce off, and be scattered on the strip 27.

On the other hand, when the cover 55 is provided as shown in FIG. 5, the coolant scattered from the roll neck 57 of the upper auxiliary roll 56 toward the rolling mill exit side collides with the cover 55 and is repelled. Therefore, the coolant does not fall on the upper plate portion 51b of the portion 51, and therefore the coolant is stripped.
It doesn't scatter on 9.

That is, in the second embodiment in which the cover 55 is provided, it is possible to more completely prevent the coolant from scattering on the strip 59, as compared with the first embodiment.
It should be noted that the present invention is not limited to the above-mentioned embodiments and can be of course implemented in various modes within the scope of the gist of the present invention.

For example, if vacuum suction is performed from the recovery port in each of the above embodiments, the blown air and the coolant can be more effectively recovered. In this case, if the vacuum suction flow rate is higher than the flow rate of the blowing air, it is even more effective. Further, in each of the above embodiments, the air nozzle may be arranged at the center of the contact portion between the roll bite and / or the upper work roll and the upper auxiliary roll. In this case, two adjacent air nozzles are arranged so as to cross each other, and the direction of the air nozzles is adjusted so that air is blown from the central portion of the contact portion between the roll bite and / or the upper work roll and the upper auxiliary roll toward the end portion. Adjust.

[0031]

As described above, in the present invention, the blown air is blown out from the housing because the blown air is blown off from the air nozzle to blow off the coolant to be scattered on the strip and the recovery port for receiving the blown coolant is provided. There is no swirling air flow inside, and the air blown from the air nozzle does not scatter the coolant on the strip.

Therefore, it is possible to prevent the splash of the coolant on the strip more effectively as compared with the conventional coolant removing device, and it is possible to prevent defects such as oil stains caused by the splash of the coolant. .

[Brief description of drawings]

FIG. 1 is a front view of a rolling mill including a coolant removing device according to a first embodiment.

FIG. 2 is a side view of a rolling mill including the coolant removing device according to the first embodiment.

FIG. 3 is a plan view of a rolling mill including the coolant removing device according to the first embodiment.

FIG. 4 is an explanatory diagram showing an operation of a rolling mill including the coolant removing device according to the first embodiment.

FIG. 5 is an explanatory diagram of a coolant removing device according to a second embodiment.

FIG. 6 is an explanatory view showing a conventional rolling mill.

FIG. 7 is an explanatory view showing a flow of blown air in a housing of a conventional rolling mill.

[Explanation of symbols]

 1, 50 ... Rolling mill 3 ... Housing 5, 7 ... Vertical work roll 9, 11 ... Vertical auxiliary roll 15, 16 ... Coolant nozzle 21, 22 ... Air nozzle 24, 25, 51, 52 ... Vertical recovery part 24a, 25a, 51a, 52a ... Vertical collection port 27, 59 ... Strip 51 ... Cover

Claims (1)

[Claims] 1. A coolant removing device for a rolling mill, comprising an air nozzle that blows air outward from a rolling mill outlet side toward a contact portion between a roll bite and / or a work roll and an auxiliary roll to blow out the coolant. , Near the end of the roll bite on the delivery side of the rolling mill and / or near the end of the contact portion between the work roll and the auxiliary roll, and on the downstream side of the air flow by the air nozzle,
A coolant removing device for a rolling mill, comprising a recovery port for receiving the coolant removed by the air nozzle.