CN114406021B - Method for immediately changing concentration of cold rolling cooling lubricating liquid - Google Patents
Method for immediately changing concentration of cold rolling cooling lubricating liquid Download PDFInfo
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- CN114406021B CN114406021B CN202111653586.8A CN202111653586A CN114406021B CN 114406021 B CN114406021 B CN 114406021B CN 202111653586 A CN202111653586 A CN 202111653586A CN 114406021 B CN114406021 B CN 114406021B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B2037/002—Mass flow control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention relates to a method for changing the concentration of cold rolling cooling lubricating liquid in real time, which is characterized in that mixing tanks are correspondingly additionally arranged according to the number of rolling mill frames, when the concentration of the cooling lubricating liquid needs to be increased, oil is replenished to each mixing tank, the concentration of the cooling lubricating liquid in the mixing tank is increased on the basis of the original liquid concentration, and after the required concentration is met, the oil replenishing is stopped; when the concentration of the cooling lubricating liquid needs to be reduced, water is supplemented to each mixing tank, the concentration of the cooling lubricating liquid in the mixing tank is reduced on the basis of the original liquid concentration, and after the required concentration is met, water supplementing is stopped. The concentration of the cooling lubricating liquid sprayed to the rolling mill is changeable in time, and the concentration change time of the system is greatly shortened compared with the concentration adjustment time in the prior art.
Description
Technical Field
The invention relates to the field of strip steel cold rolling, in particular to a method for immediately changing the concentration of cold rolling cooling lubricating liquid.
Background
84% -88% of deformation work of the cold-rolled strip steel is converted into heat energy, so that the temperature of the strip steel and a roller is increased, and the service life of the roller is reduced; destroying the normal roller shape; affecting the strip shape and dimensional accuracy. The rolling oil and water are mixed into cooling lubricating liquid according to a certain proportion, and the cooling and lubricating of the roller and the strip steel can reduce friction, reduce rolling pressure and energy consumption and prevent metal from sticking to the roller. Circulation path of cooling lubricating liquid in the prior art: cleaning tank, spraying to rollers and strip steel, collecting tank, returning tank, circulating pump, filter and cleaning tank.
The steel grades produced by cold rolling generally have dozens of steel grades, and the deformation resistance of different steel grades is quite different. The concentration of cooling lubricating liquid is increased for the steel with large deformation resistance, so that rolling pressure and energy consumption can be reduced, and the expansion of strip steel is reduced; relatively reducing cooling and lubricating for steel with small deformation resistanceThe liquid concentration can reduce the drawing of the strip steel. The total liquid volume of the existing cooling and lubricating system is generally kept between 150 and 200m 3 By adopting a single-point oil supplementing and water supplementing mode, the concentration change of the whole system needs more than 3 hours, so that the actual concentration cannot be adapted to the steel grade of the online strip steel. The patent provides a method for changing the concentration of cooling lubricating liquid in time, when producing the steel grade with small deformation resistance, the concentration is reduced, the obstruction of the longitudinal extension of the strip steel in a rolling deformation area is relatively increased, and therefore the narrowing of the strip steel is eliminated. The concentration is improved when the steel with large deformation resistance is produced, and the obstruction of the longitudinal extension of the strip steel in the rolling deformation area is relatively reduced, so that the rolling pressure and the energy consumption are reduced, and the expansion of the strip steel is reduced.
Disclosure of Invention
The invention aims to provide a method for changing the concentration of cold rolling cooling lubricating liquid in real time, and the time for adjusting the concentration is greatly shortened.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for changing the concentration of cold rolling cooling lubricating liquid immediately, add the mixing tank according to the number of rolling mill frame times correspondingly, each mixing tank has liquid inlet, oil inlet, water inlet, liquid outlet separately, the liquid inlet of each mixing tank is connected with liquid outlet pipe of the cooling lubricating liquid cleaning tank, the oil inlet is connected with oil outlet pipe of the oil storage tank, the water inlet is connected with water outlet pipe of the water storage tank, the liquid outlet is connected with spray beam of the correspondent rolling mill, the sprayed cooling lubricating liquid is recycled to the return tank through the collecting tank at the bottom of rolling mill, the liquid outlet pipe of the return tank is connected with the cooling lubricating liquid cleaning tank through the filter;
when the concentration of the cooling lubricating liquid needs to be increased, the oil supplementing pump is started to supplement oil to each mixing tank, the concentration of the cooling lubricating liquid in the mixing tank is increased based on the original liquid concentration, and after the concentration of the outlet of the cooling lubricating liquid cleaning tank meets the required concentration, the oil supplementing is stopped;
when the concentration of the cooling lubricating liquid needs to be reduced, the water supplementing pump is started to supplement water to each mixing tank, the concentration of the cooling lubricating liquid in the mixing tank is reduced on the basis of the original liquid concentration, and after the concentration of the outlet of the cooling lubricating liquid cleaning tank meets the required concentration, water supplementing is stopped.
The volume of the mixing tank is 1% -5% of the volume of the cooling lubricating liquid cleaning tank.
And a stirring device is arranged in the mixing tank.
And a liquid outlet pump and a concentration detector are arranged on the liquid outlet pipe of the cooling lubricating liquid cleaning tank.
And the oil outlet pipe of the oil storage tank is provided with an oil supplementing pump.
And a water supplementing pump is arranged on the water outlet pipe of the water storage tank.
And a liquid supplementing pump is arranged on the liquid outlet pipe of the return tank.
The liquid inlet of each mixing tank is provided with a liquid inlet control valve, the oil inlet is provided with an oil inlet control valve and an oil inlet flow detection controller, the water inlet is provided with a water inlet control valve and a water inlet flow detection controller, and the liquid outlet is provided with a liquid outlet variable-frequency speed regulating pump.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, each mixing tank respectively provides cooling lubricating liquid for each rolling mill, the concentration of the cooling lubricating liquid sprayed to the rolling mill is changeable in time, and the concentration change time of the whole system is also greatly shortened compared with the concentration adjustment time in the prior art.
2. The concentration of the cooling lubricating liquid can be changed immediately, so that a real guarantee is provided for relevant adjustment in the production of different steel grades.
3. Because the concentration of the cooling lubricating liquid is changeable in time, when the hard steel with large deformation resistance is produced, the friction force of the deformation area is reduced by increasing the concentration of the spraying liquid, the rolling pressure and the energy consumption are reduced, and the annual energy consumption is reduced by 2.8 percent.
4. Because the concentration of the cooling lubricating liquid sprayed by the rolling mill is changeable in time, when the hard steel with large deformation resistance is produced, the friction force of the deformation area is reduced by improving the concentration of the sprayed liquid, the roughness decline trend of the working roller is slowed down, the control of the surface roughness of the strip steel is facilitated, and the rolling period of the working roller is prolonged.
5. Because the concentration of the cooling lubricating liquid sprayed by the rolling mill is changeable immediately, when the hard steel with large deformation resistance is produced, the friction resistance of the strip steel extending longitudinally is reduced by increasing the concentration of the sprayed liquid, and the expansion ratio generated in the strip steel rolling process is reduced from 45.94% to 11.22%.
6. Because the concentration of the cooling lubricating liquid sprayed by the rolling mill is changeable immediately, when the soft steel with small deformation resistance is produced, the reduction ratio generated in the rolling process of the strip steel can be reduced from 94.96% to 32.17% by reducing the concentration of the sprayed liquid and relatively increasing the friction resistance of the strip steel in the longitudinal extension.
7. The accurate control of the concentration of the cooling lubricating liquid can greatly reduce the cost consumption of the rolling oil.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
as shown in FIG. 1, in the method for changing the concentration of cold rolling cooling lubricating liquid in real time, 5 mixing tanks (T1, T2, T3, T4 and T5) are additionally arranged in an original system and respectively correspond to 5 rolling mills.
The volume of the mixing tank is 1% -5% of the volume of the cooling lubricating liquid cleaning tank. A stirring device is arranged in the mixing tank. The mixing tanks are respectively provided with a liquid inlet, an oil inlet, a water inlet and a liquid outlet, the liquid inlets of the mixing tanks are connected with a liquid outlet pipe of the cooling lubricating liquid cleaning tank, a liquid outlet pump Ps is arranged on the liquid outlet pipe of the cooling lubricating liquid cleaning tank, and a concentration detector CIC is arranged at the outlet of the liquid outlet pump Ps.
The oil inlet is connected with an oil outlet pipe of the oil storage tank, and an oil supplementing pump Po is arranged on the oil outlet pipe of the oil storage tank.
The water inlet is connected with a water outlet pipe of the water storage tank, and a water supplementing pump Pw is arranged on the water outlet pipe of the water storage tank.
The liquid outlet is connected with the corresponding rolling mill spray beam, the sprayed cooling lubricating liquid is recovered to the return tank through the collecting tank at the bottom of the rolling mill, and the liquid outlet pipe of the return tank is connected with the cooling lubricating liquid cleaning tank through the filter. The liquid outlet pipe of the return tank is provided with a liquid supplementing pump Pr.
Each mixing tank (T1, T2, T3, T4, T5) is provided with a liquid inlet control valve (v 1, v2, v3, v4, v 5), an oil inlet control valve (o 1, o2, o3, o4, o 5), and an oil inlet flow rate detection controller (FICO 1, FICO2, FICO3, FICO4, FICO 5). Water inlet control valves (w 1, w2, w3, w4, w 5), water inlet flow detection controllers (FICW 1, FICW2, FICW3, FICW4, FICW 5), liquid outlet variable-frequency speed pumps (P1, P2, P3, P4, P5), and liquid outlet flow detection controllers (FICz 1, FICz2, FICz3, FICz4, FICz 5).
When the concentration of the cooling lubricating liquid needs to be increased, the oil supplementing pump Po is started, the oil inlet control valves o 1-o 5 are opened, oil is supplemented to the mixing tanks T1-T5, and the concentration of the injected liquid is increased on the basis of the original liquid concentration; stopping oil supplementing when the concentration detected by the concentration detector CIC meets the set concentration; the mixing tank has small liquid storage and can change the concentration rapidly.
When the concentration of the cooling lubricating liquid needs to be reduced, the water supplementing pump Pw is started, the water inlet control valves w 1-w 5 are opened, water is supplemented to the mixing tanks T1-T5, the concentration of the sprayed liquid is reduced on the basis of the original concentration of the liquid, and water supplementing is stopped when the concentration detected by the concentration detector CIC meets the set concentration. The mixing tank has small liquid storage and can change the concentration rapidly.
EXAMPLE 1 concentration unchanged
Cooling lubricating liquid cleaning tank volume 200m 3 Each volume of the mixing tank is 5m 3 The jet flow rate of the rolling mill is set to be 5000L/min. The concentration of the sprayed liquid is not changed, taking 1 rolling mill as an example:
mixing tank T1 refuel flow lo=0. T1 water feeding flow L W ＝0。
Mixing tank T1 feed flow l1=1 mill jet flow L2.
Example 2: increase spray concentration
Cooling lubricating liquid cleaning tank volume 200m 3 Each volume of the mixing tank is 5m 3 The jet flow rate of the rolling mill is set to be 5000L/min. The concentration of the jet cooling lubricating liquid is represented by the original liquid concentration N1:1.5% to set liquid concentration N2:2%.
Taking 1 rolling mill as an example:
the oil supplementing pump Po is started, the oil inlet control valve o1 is opened to refuel oil into the mixing tank T1, and the oil inlet flow detection controller FICO1 controls the refuel flow of the mixing tank T1: lo=l2 (N2-N1)/(1-N1) = (5000 l×0.5%)/0.985=25.38L/min. The inlet flow rate of the mixing tank L1=L2-Lo=5000-25.38= 4974.62L/min. After 80 minutes, the liquid concentration from CIC detection was 2%, the make-up pump Po stopped, the inlet control valve o1 was closed, and fueling stopped.
Example 3: reducing spray concentration
Cooling lubricating liquid cleaning tank volume 200m 3 Each volume of the mixing tank is 5m 3 The jet flow of the rolling mill is set to be 6000L/min. The concentration of the sprayed liquid is defined by the original liquid concentration N1:2% was reduced to 1.5% of the set liquid concentration. Taking 1 rolling mill as an example:
the water make-up pump Pw is started, the water inlet control valve w1 is opened, and water is added to the mixing tank T1. The water inlet flow detection controller FICW1 controls the water adding flow L W =l2/N1 (N1-N2) =6000L/2% (2% -1.5%) =1500L/min. Feed flow rate l1=l2-L of mixing tank W =6000L-1500 l=4500L/min. After 36 minutes, the CIC detects that the concentration of the liquid output by the mixing tank is 1.5%, the water supplementing pump Pw is stopped, the water inlet control valve w1 is closed, and the water adding is stopped. At this time, l1=l2=6000L/min.
The time comparison of this application with prior art concentration adjustment is shown in the following table:
the above description is only of the basic principle of the invention, and is not limited in any way, and all equivalent changes and modifications according to the invention are within the scope of the technical protection scheme of the patent.
Claims (6)
1. A method for changing the concentration of cold rolling cooling lubricating liquid immediately is characterized in that mixing tanks are correspondingly additionally arranged according to the number of rolling mill frames, each mixing tank respectively provides cooling lubricating liquid for each rolling mill, and the concentration of the cooling lubricating liquid sprayed to the rolling mill is changeable immediately;
each mixing tank is provided with a liquid inlet, an oil inlet, a water inlet and a liquid outlet, the liquid inlet of each mixing tank is connected with a liquid outlet pipe of the cooling lubricating liquid cleaning tank, and the volume of the mixing tank is 1% -5% of the volume of the cooling lubricating liquid cleaning tank;
the oil inlet is connected with an oil outlet pipe of the oil storage tank, the water inlet is connected with an water outlet pipe of the water storage tank, the liquid outlet is connected with a spray beam of a corresponding rolling mill, sprayed cooling lubricating liquid is recovered to the return tank through a collecting tank at the bottom of the rolling mill, and the liquid outlet pipe of the return tank is connected with a cooling lubricating liquid cleaning tank through a filter; the liquid inlet of each mixing tank is provided with a liquid inlet control valve, the oil inlet is provided with an oil inlet control valve and an oil inlet flow detection controller, the water inlet is provided with a water inlet control valve and a water inlet flow detection controller, and the liquid outlet is provided with a liquid outlet variable-frequency speed regulating pump;
when the concentration of the cooling lubricating liquid needs to be increased, the oil supplementing pump is started to supplement oil to each mixing tank, the concentration of the cooling lubricating liquid in the mixing tank is increased based on the original liquid concentration, and after the concentration of the outlet of the cooling lubricating liquid cleaning tank meets the required concentration, the oil supplementing is stopped;
when the concentration of the cooling lubricating liquid needs to be reduced, the water supplementing pump is started to supplement water to each mixing tank, the concentration of the cooling lubricating liquid in the mixing tank is reduced on the basis of the original liquid concentration, and after the concentration of the outlet of the cooling lubricating liquid cleaning tank meets the required concentration, water supplementing is stopped.
2. The method for changing the concentration of cold rolling cooling lubricating liquid immediately according to claim 1, wherein a stirring device is arranged in the mixing tank.
3. The method for changing the concentration of cold rolling cooling lubricating liquid according to claim 1, wherein a liquid outlet pump and a concentration detector are arranged on a liquid outlet pipe of the cooling lubricating liquid cleaning tank.
4. The method for changing the concentration of cold rolling cooling lubricating liquid immediately according to claim 1, wherein the oil tank outlet pipe is provided with an oil supplementing pump.
5. The method for changing the concentration of cold rolling cooling lubricating liquid immediately according to claim 1, wherein the water storage tank water outlet pipe is provided with a water supplementing pump.
6. The method for changing the concentration of cold rolling cooling lubricating liquid immediately according to claim 1, wherein a liquid supplementing pump is arranged on the liquid outlet pipe of the return tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111653586.8A CN114406021B (en) | 2021-12-30 | 2021-12-30 | Method for immediately changing concentration of cold rolling cooling lubricating liquid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111653586.8A CN114406021B (en) | 2021-12-30 | 2021-12-30 | Method for immediately changing concentration of cold rolling cooling lubricating liquid |
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| CN114406021B true CN114406021B (en) | 2023-07-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4355278B2 (en) * | 2004-11-22 | 2009-10-28 | 新日本製鐵株式会社 | Lubricating oil supply method in cold rolling |
| CN100443202C (en) * | 2005-09-13 | 2008-12-17 | 北京伟世杰液压设备有限公司 | Bearing lubricating and cooling method and device |
| CN201320559Y (en) * | 2008-08-21 | 2009-10-07 | 济南钢铁股份有限公司 | Hot tandem rolling finishing mill group process lubricating automatization control system |
| CN109092914A (en) * | 2018-08-06 | 2018-12-28 | 鞍钢未来钢铁研究院有限公司 | A kind of steel rail rolling lubricating method and device |
| CN110773571B (en) * | 2019-11-13 | 2020-10-27 | 燕山大学 | Method for controlling concentration of emulsion of secondary cold rolling unit on line |
| CN111822519A (en) * | 2020-08-26 | 2020-10-27 | 武汉钢铁有限公司 | Cold continuous rolling mill roller cooling control system |
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