JP2001170708A - Method for removing scale in rolling oil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for removing scale in rolling oil by which the metal scale in the rolling oil is removed rapidly and surely without settling and depositing the metal scale in the bottom part of a recovered oil tank. SOLUTION: In this method for removing the scale in the rolling oil in the return tank of the rolling oil, the scale removal is performed dividing it into two stages and, as its 1st stage, the metal scale which is apt to settle is settled and removed in an auxiliary tank and, after that, as the 2nd stage, fine metal scale is removed by carrying out filtration with a filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for removing scale from rolling lubricating oil.

[0002]

2. Description of the Related Art Generally, when a metal material is rolled by a rolling mill, rolling lubricating oil is dropped on a rolling portion of the rolling mill and on the metal material.

[0003] Here, the rolling lubricating oil contaminated by the rolling operation is first collected in a return tank.
Since the rolling lubricating oil contains metal scales and the like generated during the rolling operation of the metal material, the rolling lubricating oil filters and removes the metal scales and the like by a scale removing device or the like.

[0004] Next, the clean rolling lubricating oil obtained by filtering and removing the metal scale and the like is recirculated and used.

FIG. 2 is an explanatory front view showing such a conventional rolling lubricating oil clean circulation system.

In FIG. 2, 1 is a tank containing rolling lubricant, 2 is rolling lubricant, 3 is a delivery pump, 4 is a supply pipeline, 5 is a rolling mill, 6 is a recovery pipeline, and 7 is a return of rolling lubricant. Tank, 8: dirty rolling lubricant, 9: metal scale, 1
0 is a delivery pump, 11 is a delivery pipeline, 12 is a scale removing device, and 13 is a delivery pipe.

[0007] That is, as can be seen from FIG. 2, in the conventional clean lubricating oil circulation system, first, the rolling lubricating oil 2 is put in the tank 1.

Next, the rolling lubricating oil 2 is sent out through a delivery pump 3 and a supply piping 4 so as to be sprayed onto a rolling portion of a rolling mill 5. Here, the rolling lubricating oil 2 used in the rolling mill 5 becomes a dirty rolling lubricating oil mixed with a metal scale or the like.

The contaminated rolling lubricating oil is recovered to the return tank 7 via the recovery pipe 6.

In the return tank 7, dirty rolling lubricating oil 8 is collected, and the metal scale 9 in the rolling lubricating oil 8 sinks and accumulates at the bottom. Although not shown, the fine metal scale 9 stays in the rolling lubricant 8 as it is.

Then, the rolling lubricating oil 8 in which the fine metal scale 9 stays as it is is sent out to a scale removing device 12 through a delivery pump 10 and a delivery piping 11.

The fine metal scale 9 mixed in the rolling lubricating oil 8 is removed by filtration by the scale removing device 12, so that a clean rolling lubricating oil 2 is obtained.

Next, this clean rolling lubricating oil 2 is poured into the tank 1 from the delivery pipe 13.

Thus, the rolling lubricating oil is used while being circulated.

The rolling lubricating oil lost during the circulation is appropriately replenished.

[0016]

As described above, in the conventional rolling lubricating oil clean circulation system, the return tank 7
Metal scale 9 in dirty rolling lubricating oil 8 collected inside
Are settled and accumulated at the bottom of the return tank 7 as shown in FIG.

For this reason, in the conventional rolling lubricating oil clean circulation system, periodic inspection and cleaning are indispensable in order to remove the metal scale 9 that has settled and returned in the return tank 7.

Therefore, the metal scale 9 is settled and accumulated at the bottom of the return tank 7 until the periodical inspection and cleaning are performed.

By the way, when the rolling lubricating oil is in contact with a metal scale such as a metal or a metal oxide, there is a property that deterioration is easily promoted by the metal scale such as the metal or the metal oxide. In particular, the copper oxide scale is chemically active and has a property of easily deteriorating the rolling lubricating oil.

On the other hand, when a cast copper material is rolled by a rolling mill, a large amount of copper oxide scale is generated, and the copper oxide scale is mixed in the rolling lubricating oil. The rolling lubricating oil mixed with the copper oxide scale has a problem that the lubricating action is reduced, thereby shortening the roll life of the rolling mill.

For this reason, there has been a demand for a clean rolling lubricating oil circulation system that can quickly remove the metal scale in the rolling lubricating oil 8 without settling and accumulating on the bottom of the return tank 7.

The present invention has been made in view of such a point, and an object of the present invention is to solve the above-mentioned drawbacks of the prior art and to reduce the metal scale contained in the rolling lubricating oil to the return tank. It is an object of the present invention to provide a method for removing scale in rolling lubricating oil, which can be quickly removed without sedimentation and accumulation on the bottom.

[0023]

The gist of the present invention is to provide a method for removing scale from rolling lubricant in a rolling lubricant return tank, in which the scale is removed in two stages. In a separately installed auxiliary tank, sedimentation and removal of metal scale components that are likely to settle are performed, and then, by performing filter filtration as a second step, fine metal scale components are removed. The scale removal method.

In the present invention, it is preferable that the separately installed auxiliary tank is provided separately in the lubricating oil return tank and so as to allow the lubricating oil to overflow into the return tank.

In the present invention, it is preferable that the separately installed auxiliary tank has a shape whose diameter is reduced from the top to the bottom.

Further, in the present invention, the sludge liquid mainly composed of the metal scale settled at the bottom of the separately installed auxiliary tank is sent to a sludge liquid scale removing device by a sludge pump installed at the bottom of the auxiliary tank to remove the scale. It is preferable to filter and remove to obtain a filtered sludge liquid, and thereafter return the filtered sludge liquid to the return tank.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the method for removing scale from rolling lubricating oil according to the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory front view showing one embodiment of the method for removing scale from rolling lubricating oil according to the present invention.

In FIG. 1, 1 is a tank containing rolling lubricant, 2 is rolling lubricant, 3 is a delivery pump, 4 is a supply pipeline, 5 is a rolling mill, 6 is a recovery pipeline, and 7 is a rolling lubricant tank. , 8 is a contaminated rolling lubricant, 9 is a metal scale, 10 is a delivery pump, 11 is a delivery pipeline, 12 is a scale removing device, 13 is a delivery pipe, 20 is an auxiliary tank, 21 is a sludge liquid delivery pump, and 22 is a sludge liquid delivery pump. A delivery pipeline, 23 is a scale removing device, 24 is a delivery pipeline, 25 is a filtration sludge liquid tank, 26 is a filtration sludge liquid, and 27 is a pipeline thereof.

That is, the method of removing scale from the rolling lubricant according to one embodiment of the present invention is the same as that of the conventional rolling lubricating oil clean circulation system shown in FIG.

That is, the basic configuration of the method for removing scale from rolling lubricating oil according to one embodiment of the present invention is as follows. First, clean rolling lubricating oil 2 is put in a tank 1.
Is sent out to the rolling part of the rolling mill 5 via the delivery pump 3 and the piping 4. The rolling lubricating oil contains metal scale generated during the rolling process. That is, the rolling oil becomes dirty.

The feature of the method for removing scale from rolling lubricating oil according to one embodiment of the present invention lies in the method for cleanly treating the contaminated rolling lubricating oil.

That is, the first feature of the method for removing scale from rolling lubricating oil according to one embodiment of the present invention is that an auxiliary tank 20 for removing primary scale is installed in the return tank 7, Is fed through the recovery pipe line 6 so that the rolling lubricating oil contaminated from the wastewater may cause a cyclone phenomenon. By doing so, the scale contained in the rolling lubricating oil settles at the center bottom of the tank 20.

The rolling lubricating oil returns from the upper opening of the auxiliary tank 20 and overflows into the tank 7.

Here, dirty rolling lubricating oil containing fine scales overflows preferentially. On the other hand, the rolling lubricating oil containing a heavy scale with a large density is settled and accumulated at the bottom of the central portion of the auxiliary tank 20.

The inner diameter and height of the auxiliary tank 20 are
It is determined so that the following equation (1) is satisfied.

W · g> d · Cd · 1 / 2ρυ ² (1) Formula W; Weight of Scale g; Acceleration of Gravity d; Average Diameter of Scale Cd; Resistance Value of Scale to Lubricating Oil ρ; Scale density υ; rising flow velocity of dardy rolling lubricating oil In other words, in the present invention, υ is determined so as to satisfy equation (1). Then, the inner diameter and height of the auxiliary tank 20 are determined from the amount of rolling lubricating oil flowing into the auxiliary tank 20 per unit time.

A second feature of the method for removing scale from rolling lubricant according to one embodiment of the present invention is that the auxiliary tank 2
In other words, the sludge liquid mainly composed of the scale that has settled at the center bottom of the zero is sent out to the sludge liquid scale removing device 23 via the sludge liquid delivery pump 21 and the sludge solution delivery piping 22.

The sludge liquid scale removing device 23 can quickly filter the fed sludge liquid to remove the large weight scale mixed therein. Filtration sludge liquid 26 obtained by filtering and removing the scale is collected in filtration sludge liquid tank 25 via filtration sludge liquid delivery piping 24.

Next, the filtered sludge liquid 26 collected in the filtered sludge liquid tank 25 is returned to the rolling lubricating oil 8 in the return tank 7 through the filtered sludge liquid return pipe line 27. Therefore, since the filtration sludge liquid 26 returned into the return tank 7 does not contain scale, sedimentation and accumulation of the large-scale scale do not occur at the bottom of the return tank 7.

In the present invention, in order to efficiently send out the scale that settles and accumulates at the bottom of the auxiliary tank 20, it is more advantageous that the amount of scale that settles and accumulates at the bottom of the auxiliary tank 20 is larger.

The amount of scale that settles and accumulates at the bottom of the auxiliary tank 20 is determined by the difference between the inner diameter of the inlet of the rolling lubricant 8 fed into the auxiliary tank 20 and the top of the scale that accumulates and accumulates. Is determined by For this reason, it is desirable that the connection position of the recovery pipe line 6 connected to the side surface of the auxiliary tank 20 be provided above the auxiliary tank 20 as much as possible.

It is preferable that the inner wall surface of the auxiliary tank 20 is made of a wear-resistant material or that a wear-resistant coating agent is coated on the upper surface of the inner wall surface.

The dardy rolling lubricating oil 8 from which the metal scale 9 has been removed in this way is sent out to the scale removing device 12 via the delivery pump 10 and the delivery piping 11.

The fine metal scale 9 mixed in the rolling lubricating oil 8 is filtered and removed by the scale removing device 12 to obtain the clean rolling lubricating oil 2.

Next, the rolled lubricating oil 2 cleaned by the scale removing device 12 is poured into the tank 1 from the delivery pipe 13.

Thus, the rolling lubricating oil is used while circulating.

The rolling lubricating oil lost during the circulation is appropriately replenished.

[0049]

According to the method for removing scale from rolling lubricating oil of the present invention, scale in rolling lubricating oil can be quickly and reliably removed without sedimentation and accumulation at the bottom of the return tank. It is industrially useful.

[Brief description of the drawings]

FIG. 1 is an explanatory front view showing one embodiment of a method for removing scale from rolling lubricating oil according to the present invention.

FIG. 2 is an explanatory front view showing a conventional rolling lubricating oil clean circulation system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 2 Rolling lubricating oil 3 Delivery pump 4 Pipe line 5 Rolling machine 6 Recovery piping line 7 Return tank 8 Rolling lubricating oil 9 Metal scale 10 Delivery pump 11 Delivery piping line 12 Scale removing device 13 Delivery pipe 20 Auxiliary tank 21 Sludge liquid delivery Pump 22 Sludge liquid delivery pipe line 23 Sludge liquid scale removing device 24 Filtration sludge liquid delivery pipeline 25 Filtration sludge liquid tank 26 Filtration sludge liquid 27 Filtration sludge liquid return pipe line

Claims (4)

[Claims] In a method for removing scale from rolling lubricant in a rolling lubricant return tank, scale removal is performed in two stages, and as a first stage, a metal scale component that tends to settle in an auxiliary tank separately installed. Sedimentation and removal,
Thereafter, as a second step, a fine metal scale component is removed by performing filter filtration to remove scale from rolling lubricating oil. 2. The rolling lubricating oil according to claim 1, wherein the separately installed auxiliary tank is independent in the lubricating oil return tank and is installed so that the lubricating oil overflows in the return tank. Scale removal method. 3. A method for removing scale from rolling lubricating oil, wherein the separately installed auxiliary tank has a shape whose diameter is reduced from the top to the bottom. 4. A sludge liquid mainly composed of metal scale settled at the bottom of a separately installed auxiliary tank is sent to a sludge liquid scale removing device by a sludge pump installed at the bottom of the auxiliary tank to filter and remove the scale. A method of removing scale from the rolling lubricating oil, whereby the filtered sludge solution is returned to the return tank.