Method of lubing and cooling rolls and metal strip in cold rolling of metal strips

FIELD: process engineering.

SUBSTANCE: method comprises spraying lubricant (9) on entry side (7a) of stand (1) and coolant (10) on stand (1) exit side (8a) and feeding them to strip bottom (2a) and/or top (2b), and/or stand (1) bottom roll (4) and top roll (3). Amount of lubricant on said entry side is continuously calculated and proportioned using physical model (22) to correspond to minimum required amount for rolling with due allowance for such rolling parameters as speed (13), strip quality (14), for example, tensile strength, flatness (11a, 11b), surface roughness (26) and tension (28) at stand entry and exit, rolling force (29), roll diameter (30), roughness and (31) and material (32) of rolls.

EFFECT: higher quality of rolled strip.

10 cl, 3 dwg

 

The invention relates to a method for lubrication and cooling of the rolls and the metal strip during rolling, in particular during cold rolling, metal bands, and by spraying, at least on the input side is applied to the lubricating means and on the output side, the cooling means and to the lower and upper sides of the strip and/or to the upper and lower work rolls are served lubricant-active, purifying and inertizing substances or gases (environment) or their combinations.

From EP 0367967 B1 is known such a method of cooling and lubrication of the rolls and roll in cold rolling. While containing oil phase of oil-in-water emulsion is established by a special technique of emulsification, depending on the local tensile stresses in the band or depending on the conditions of capture between the roller and band and regulated by quantitative and model the use of emulsifiable environments. Disadvantages are too thick layer of deposited oil with a high proportion of water and, thereby, the risk of corrosion on the finished steel strip or coating on the strip of non-ferrous metal. Too thick a layer of deposited oil means that the band remain amount of oil that must be removed due to additional operations. In the case of environmental pollution resulting from the disposal of oznikaet even greater production costs.

From DE 19953230 C2 is known, furthermore, the method of cold rolling metal piece, in which he at room temperature is ignored for plastic deformation through the gap between driven in counter rotation rollers, and in the area mivakulova gap instead of coolant injected inert gas having a temperature below room temperature, as, for example, liquid nitrogen, which is lower than the temperature of the roll.

The basis of the invention lies in the task of increasing production of a metal strip by eliminating some steps in the process, and should be provided with higher quality bands due to the stability of the rolling process, in particular through the negotiation of friction in megvallva the gap.

This problem is solved according to the invention due to the fact that the number printed on the input side of clean lubricant is continuously calculated and proportioned on the basis of the physical model calculation so that it meets the minimum quantity of lubricant that is actually required during rolling, while physical model of continuous calculation of the minimum amount of lubricant is continuously takes into account such parameters as speed, quality, flatness, and surface tension of the strip at input and output sides of the x rolling stands, and such process parameters as the load capacity, diameter, roughness and material of the work rolls.

Advantages are better strip quality due to more stable rolling process, in particular, ensures the coordination of friction in megvallva gap. In addition, it is preferable that the subsequent removal of the oil is not required, resulting in a drop of additional stages of the process. Minimum quantity lubrication means on the input side is applied only as much lubricant as needed to achieve the desired product quality. In addition, fall utilizing device and the cost of oil emulsion. Online dosing of lubricant on the input side can be considered constant process parameters (e.g., material, width and the like), and during the passage - changing process parameters (e.g., strip speed, load, anticipation, tension bands, the distribution of strip tension across its width, the temperature of the strip, the temperature of the rolls, the strip thickness and compression in thickness). In addition, on the output side can be directly used preservatives (substances against corrosion and bonding strip).

One variant of the invention consists in the fact that the physical model calculation takes into account the following the parameters:

- forecast and optimization plan passes;

- evaluation of the lubricant film using tribological model;

- temperature model;

elastic deformation of the rolls;

- mechanical model mivakulova gap;

- optimization model for surface quality;

- coordination of friction with the process of reduction, or training, or flexible rolling (receiving different thicknesses of strip);

- hydrodynamic model;

- model prints roughness between the strip and the work rolls.

These parameters can be used to make based on them online using the physical model of the calculation of the rolling process, which includes mechanical, thermal and tribological effects, specifically to regulate the application environments on the rolls in mijalkovic gap and the metal strip.

Another variant provides that the rolling process sets the following variables control actions for applying liquid or gaseous lubricants and coolants based regulation by the model calculation:

volumetric flow;

- pressure;

- temperature;

- various settings across the width of the strip;

- if you need different settings for the lower and upper sides of the strip.

The benefits are in addition to the fast approval of the Council is managing impacts for application environments including, what can be done, for example, changing the ratio of mixing different operating environments, such as the mixing of the substance with greatly reducing friction in megvallva the gap effect and substance, with little effect on friction in megvallva gap, however, with a high detergent action.

This further preferable that the ratio of mixing of liquid and gaseous media is changed in accordance with the computer program physical model.

Another variant provides that prior to the beginning of the rolling process, the process parameters, such as load, tension and thickness of the strips and the like, are defined in terms of passes, which is processed by a computer program.

The invention is distinguished further by the fact that the process parameters are used to set a control loop for thickness, elongation, flatness, roughness and/or surface of the strip.

One improvement is also due to the fact that there is a forecast for the optimization of the temperature development in the band and/or work rolls.

Preferably also, what is the choice of lubricants by type of manufacturer, viscosity and temperature characteristic.

To improve the quality of the band also contributes to what is optimization of the strip surface by choosing rough the ti work rolls.

The described measures can be applied using the model calculation also in areas with changing speed. When this is achieved:

- set the desired surface of the strip (for example, in relation to roughness or gloss and other quality characteristics);

- set the desired flatness of the strip;

- stability (prevention of breakage of the strip);

- effective use of the media.

For so-called flexible rolling (for example, in the form of cold rolling to obtain different thicknesses of the strip along its length) is taken into account that at constant lubrication because of the variable length strip compression in the thickness of the status of the process changes dramatically. The greatly varying load only to some extent allows the installation of the desired flatness of the strip. At stages in a strong reduction in thickness is appropriate, therefore, to install a smaller coefficient of friction in megvallva the gap, if necessary, in combination with increasing the strip tension, to reduce the rolling force at least partially compensate for this effect. This process may take into account, depending on other parameters described above and using the physical model calculation (computer program).

The following examples of carrying out the invention are explained in more detail with the aid of the completion of the drawing, which shows:

- figure 1: block diagram stand for cold rolling, in combination with the alignment bodies operating on the basis of the model calculation model (computer program);

- figure 2: a table of operating parameters or process parameters used for the physical model calculation;

- figure 3: table of parameters used for the physical model calculation. (Fig 1 and 3 connected digits 2 and 3 in the circles; figure 2 and 3 are interconnected by a number 1 in a circle).

Rolling stand 1 (Fig 1) for metal bands 2 (for example, for various alloys of heavy or light metals) contains the upper 3 and lower 4 work rolls mounted between the supporting rollers 5, 6 in the pillows. Figure 1 shows 4 roll rolling mill. The described device is applicable to all types of rolling stands, for example, 6-high, 20-roller, cage Duo, etc. Metal strip 2 is sent from the unwinding device 7 on the input side 7a to the winding device 8 on the output side 8A. On the input side 7a is applied by spraying clean lubricating means 9 in the form of chemical composition, and on the output side 8A - cooling means 10. Lubricant 9 and the cooling means 10 consist of a lubricant-active, purifying and inertizing substances or gases and form their combinations and serves the Xia to the bottom 2A and upper 2b sides of the band. Lubricant-active substances on the input side 7a form an emulsion without the high water content of emulsion major oils, rolling oils and/or concentrated additives. Cleansing and inertizing substances consist of globalagenda inert gases, for example nitrogen, and combinations with other substances.

Used for this device (figure 1) consists of devices 11a to measure the flatness on the input side 7a and device 11b for measuring flatness on the output side 8A.

During passage of the metal strip by means of a device 12 for measuring the speed measured speed of 13 stripes, and using additional measuring instruments are measured existing efforts so that you can determine the quality of the 14 bands, corresponding to the properties of this metal, for example aluminum, steel, brass, copper and the like. The thickness 15 of the strip 2 is measured continuously and its width. On the bottom 2A and upper 2b side of the strip on the input side 7a are rows of 16 spray nozzles for dispensing means 9 in the right quantity and distribution of minimal lubrication 17. In rolling stands 1 such series 16 spray nozzles are arranged to lubricate the upper 3 and lower work rolls 4 and upper 5 and lower 6 back-up rolls.

On the output side 8A are top 18 and the bottom is 19 rows of spray nozzles for applying 20 nitrogen with the purpose of cooling and passivation, and optionally, as an alternative to lubricating means 9 in the form of application 21.

All substances for lubrication and cooling are determined in relation to its variable quantity in accordance with the obtained by computing or experience values calculation using the model 22, and corresponding signals are sent to the relevant Executive element connected to the measuring devices actuators. Due to this, the rolling process, in particular the cold rolling process, is extremely flexible thanks to the harmonization of conditions of friction. The dependence of the quantity of lubricant from the changing process parameters can be in a short time is set again. As a rule, manage to balance the friction in megvallva gap. Minimum quantity lubrication differs in that it is applied only as a lubricant 9, as required for the rolling process. When this so-called base oil may consist of various basic chemical substances, "environment 1" for minimal lubrication 17 may be mixed with the "environment 2" different model classes x, y in the environment "n", while for minimal lubrication 17 will not be achieved the required properties, for example viscosity and lubricity. The process continues on the output side 8A by applying nitrogen and alternative the positive lubricants.

Figure 2 presents appropriate parameters 23 process: block identified by the number 1 in a circle, contains when reading from left to right strip speed measured by the device 12, and then strip quality (for example, tear resistance): thickness 15 and the width of the strip 24, 25 flatness of the strip, measured by the instrument 11a, the surface (roughness) 26 strip, distribution 27 strip tension. The tension of the strip 28 is determined by the device 11 for measuring flatness.

The parameters of the efforts of 29 followed by rolling of diameter 30, 31 and roughness of the material 32 rolls, point 33 and temperature 34 rolling and compression 35 on the thickness of the metal strip 2. Similar values are provided on the output side 8A.

Figure 3 presents considered a separate, independent set of data for model 22 calculation. Settings 23 process is obtained on the basis of physical quantities, and in model 22 calculation includes additional submodels (computer program).

Preparation 36 plan passes optimized by the underlying model. To evaluate lubricant film involved tribological model 37. Temperature model 38 and the elastic deformation of the rolls 39 3-6 are entered in accordance with previous experience. Similarly accounted mechanical model 40 mivakulova gap (computer program). In addition, the model 22 calculation is enabled, the model 41 optimize surface quality. Approval 42 friction with the rolling process takes into account the reduction rolling, when training or when flexible rolling. Then we introduce the hydrodynamic model 43 distribution of lubricant 9 and model (computer program) 44 imprint roughness (surface rolls on the metal strip 2).

From the preset parameters for the model 22 calculation form specified data 45 efforts 29 rolling and stretching of the strip 28 (figure 3 left). Happen individual adjustment 46 regulatory circuits for thickness 15, flatness 25 and the surface 26 of the strip in relation to the roughness, gloss and other surface characteristics, and optimization 47 plan of passes in coordination friction with the individual rolling process.

For the output side 8A figure 3 on the right should be 48 forecast and optimize the development temperature of the work rolls 3, 4 and the metal strip 2. It should be defined 49 lubricants by type, viscosity and temperature. In addition, you must enter the optimization 50 quality of the strip surface and the choice of values of the roughness of the work rolls.

The reference list of items

1 - rolling mill

2 - metal band

2A is a bottom side of a metal strip

2b, the upper side of a metal strip

3 - the upper work roll

4 - lower working Valo is

5 - upper supporting roller

6 - lower bearing roller

7 - unwinding device

7a - input side

8 - winding device

8A - output side

9 - clean lubricating tool

10 - coolant

11a - device for measuring flatness (input side)

11b is a device for measuring flatness (output side)

12 - instrument for measuring speed

13 - the speed of the rolled strip

14 - the quality of the rolled strip

15 - strip thickness

16 - number of spray nozzles

17 - the number, composition and distribution of minimal lubrication

18 - the upper row of spray nozzles (deposition of nitrogen)

19 - the bottom row of spray nozzles (deposition of nitrogen)

20 - application of nitrogen

21 - application of alternative lubricants

22 - model calculation (computer program)

23 - process parameters

24 - bandwidth

25 - flatness of the strip

26 - surface strip

27 - distribution of strip tension

28 - tension band

29 - load

30 - diameter rolls

31 - roughness rolls

32 - material rolls

33 - point rolling

34 - temperature rolls

35 - compression thickness

36 is a plan passes

37 - tribological model (computer program)

38 - temperature model (computer program)

p> 39 - elastic deformation of the roll

40 - mechanical model mivakulova gap (computer program)

41 - model surface quality

42 - coordination of friction with rolling process

43 - hydrodynamic model (computer program)

44 - model imprint roughness

45 - the task of rolling force and strip tension

46 - set 1-level regulatory systems

47 - optimization and coordination of the table passes

48 - forecast temperature changes

49 - determination of lubricant

50 - optimization of the strip surface and the roughness of the work rolls.

1. Method of lubrication and cooling rolls (3, 4, 5, 6) and a metal strip (2) by rolling in a rolling stand (1), comprising spraying at least on the input side (7a) of the cage (1) lubricant (9), and on the output side (8A) of the cage (1) - coolant (10), thus lubricating the tool (9) and cooling means (10)consisting of a lubricating-active, purifying and inertizing liquid substances or combinations thereof, serves to the lower side (2A) and/or the upper side (2b) of the strip, and/or to the lower work roll position (4) cage (1) and the upper work roll position (3), characterized in that the number printed on the input side (7a) of pure lubricant without the high water content and with the required viscosity is continuously calculated and d is serout by the physical model (22) the calculation of so, it corresponds to the minimum quantity of lubricant that is actually required during rolling, while using the physical model of a continuous calculation of the minimum amount of lubricant is continuously take into account such parameters (23) process speed (13), (14) bands, such as tear resistance, flatness (11a, 11b), the roughness of the surface (26) of the strip and the tension (28) of the strip on the input side (7a) and output side (8A) of the rolling stand (1), and such process parameters as the force (29) rolling diameter (30) of the work rolls, the surface roughness (31) and the material (32) of the work rolls.

2. The method according to claim 1, characterized in that by using a physical model (22) the calculation take into account the forecast and optimization plan passes, the assessment of the lubricant film using tribological model (37), the temperature model (38), the elastic deformation of the rolls(3, 4, 5, 6), mechanical model (40) mivakulova gap, the optimization model quality (41) surface coordination (42) friction reduction process, training or flexible rolling, hydrodynamic model (43), model (44) imprint roughness between the metal strip (2) and the working rollers (3, 4).

3. The method according to claim 1, characterized in that the rolling process variables of control actions for applying liquid or ha is obraznyh lubricating means (9) and cooling means (10) on the basis of regulation by the model (22) calculation of the set volume flow, pressure, temperature, different installation width (24) strips, if necessary, a different setup for bottom side (2A) and upper side (2b) of the strip.

4. The method according to any one of claims 1 to 3, characterized in that the mixing ratio of liquid and gaseous media change in accordance with the model calculations (22).

5. The method according to any one of claims 1 to 3, characterized in that before the start of the rolling process parameters (23) of the process, such as force (29) rolling, tension (28) and the thickness (15) bands and such, set in the table passes.

6. The method according to any one of claims 1 to 3, characterized in that the parameters (23) the process used to create a control loop for thickness (15), elongation, flatness (25), roughness and/or surface (26) of the strip.

7. The method according to any one of claims 1 to 3, characterized in that the set prediction (48) optimization of the temperature development in the metal strip (2) and/or in the working rollers (3, 4).

8. The method according to any one of claims 1 to 3, characterized in that exercise the choice of lubricants by type of manufacturer, viscosity and temperature characteristic.

9. The method according to any one of claims 1 to 3, characterized in that carry out optimization (50) the surface of the strip due to the roughness of the work rolls.

10. The method according to any one of claims 1 to 3, characterized in that the above measures are applied using the model (22) calculation also participants on the Ah with changing speed.



 

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The invention relates to metallurgy, namely rolling production, and relates to methods and tools for automatic control of the rolling process on Olegovich rolling mills

FIELD: process engineering.

SUBSTANCE: method comprises spraying lubricant (9) on entry side (7a) of stand (1) and coolant (10) on stand (1) exit side (8a) and feeding them to strip bottom (2a) and/or top (2b), and/or stand (1) bottom roll (4) and top roll (3). Amount of lubricant on said entry side is continuously calculated and proportioned using physical model (22) to correspond to minimum required amount for rolling with due allowance for such rolling parameters as speed (13), strip quality (14), for example, tensile strength, flatness (11a, 11b), surface roughness (26) and tension (28) at stand entry and exit, rolling force (29), roll diameter (30), roughness and (31) and material (32) of rolls.

EFFECT: higher quality of rolled strip.

10 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to rolling and serves for adjustment of planarity at rolling of aluminium strip or foil. In compliance with this invention, this device comprises pair of working rolls to receive the strip or foil in contact zone between rolls. Besides, it comprises multiple fluid feeders configured to direct said fluid to one or more zones on the surface of at least one roll and heater to heat said one or more zones. Proposed method comprises feeding the cryogenic fluid to one or more zones on roll or rolls surface/surfaces via one or strip or foil feeders. Note here that said zones are distributed uniformly over roll width. One zone or more zones are heated on roll surface by one or more heaters for adjustment of roll radial size over its width.

EFFECT: higher quality of strip or foil.

29 cl, 3 dwg

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