EP3461566A1 - Rolling of a product - Google Patents

Abstract

The invention relates to a rolling device (1) for rolling a rolling stock (3) and a method for operating the rolling device (1). The rolling apparatus (1) has two rolling stands (5), each of which has two work rolls (11) spaced from one another by a roll gap (15) through which the rolling stock (3) can be guided. In a first operating mode, a lubricant mixture of a carrier gas and a lubricant and coolant are applied to at least one work roll (11) of a first roll stand (5) and / or on at least one rolled material surface (25, 27) of the rolling stock (3). In a second operating mode, a skin-pass agent is applied to at least one work roll (11) of the first roll stand (5), at least one work roll (11) of the second roll stand (7) or / and at least one rolled material surface (25, 27) of the rolled stock (3) ,

Description

The invention relates to a rolling device for rolling a rolling stock and a method for operating the rolling device.

When rolling a rolling stock in a rolling mill of a rolling mill, the rolling stock is usually formed in one or more rolling passes. In particular, during cold rolling of a rolling stock, a rolling apparatus is frequently arranged at the end of the process route, which has two rolling stands and can be operated in two different operating modes.

In a first operating mode, the thickness of the rolling stock in the first rolling stand of the rolling apparatus is significantly reduced, for example by more than three percent compared to the thickness of the rolling stock entering the first rolling stand. In contrast, in the second rolling stand, the rolling stock is mainly dressed, that is, a desired surface roughness of the rolling stock is produced, the thickness of the rolling stock is only slightly reduced, for example, less than three percent compared to the thickness of the incoming rolling stock in the second rolling mill.

The first mode of operation is typically used in the production of relatively hard and thin sheet metal, for example, in the production of tinplate with a thickness of less than 0.5 mm, which is used as a can plate for food. The rolling stock in the rolling train is first rolled to a thickness which is approximately in the range of a desired final thickness of the rolling stock. As a rule, a correspondingly large number of rolling steps or a correspondingly large stitch loss is required, the rolling stock is relatively brittle and brittle after these rolling steps or rolling passes, which is why it is then, for example, in an annealing furnace, heat treated to the toughness of the material again to increase. By taking place recrystallization of the material structure reduces the material hardness, which is why the rolling stock can be fed to the rolling device.

In contrast, in the second operating mode, the rolling stock in both rolling mills of the rolling apparatus is mainly dressed without substantial reduction in thickness. The second operating mode is used, for example, when rolling a rolling stock, which is subsequently galvanized and is usually slightly thicker than the aforementioned tinplate.

Since the rolling stock is significantly reduced in thickness in the first operating mode in the first rolling stand, the first operating mode requires sufficient lubrication of the rolling stock as it passes through the first rolling stand and cooling of the rolling stock and work rolls of the first rolling stand after passing the first rolling stand. Usually, therefore, in the first operating mode, a lubricating emulsion is applied to the rolling stock before it passes through the first rolling mill, which has a relatively high proportion of lubricant of 5% to 30%. The emulsion used is usually an emulsion containing water and a rolling oil as a lubricant. To cool the rolling stock, after passing through the first roll stand, a cooling emulsion is usually applied to the work rolls of the first roll stand and / or the rolling stock, which generally comprises water and a rolling oil having a relatively low rolling oil content.

WO 2012/079785 A1 discloses a method and apparatus for applying a lubricant when rolling metallic stock. In this case, a mixture of lubricant and a carrier gas is produced in a sputtering device and applied by means of an array of spray nozzles on at least one work roll and / or the rolling stock.

The invention has for its object to provide a rolling device and a method for its operation, which are particularly improved in terms of consumption, the cost of lubricant and coolant and the efficiency of the lubricating effect.

The object is achieved by a rolling device with the features of claim 1 and by a method having the features of claim 12.

Advantageous embodiments of the invention are the subject of the dependent claims.

A rolling mill for rolling a rolling stock according to the present invention comprises a first rolling stand, a second rolling stand spaced from the first rolling stand, a lubricant mixture applying device, a coolant applying device, and a temper rolling agent applying device. Each rolling stand has two work rolls spaced apart from one another by a nip through which the rolling stock can be guided. The Schmiergemischaufbringvorrichtung is for applying a lubricant mixture of a carrier gas and a lubricant on a side facing away from the second rolling mill side of at least one work roll of the first rolling mill and / or formed on at least one Walzgutoberfläche of the rolling on a side facing away from the second rolling stand side of the first rolling stand. The coolant application device is designed for applying coolant, for example cooling water or a cooling emulsion, to a side of at least one work roll of the first rolling stand facing the second rolling stand and / or onto at least one rolling surface of the rolling stock on a side of the first rolling stand facing the second rolling stand. The skin-applying device is for applying a tempering agent on a side facing away from the second rolling mill side of at least one work roll of the first stand or / and at least one Walzgutoberfläche of the rolling stock on a side facing away from the second rolling mill side of the first rolling stand and on a first rolling stand facing side of at least one work roll of the second rolling mill and / or formed on at least one Walzgutoberfläche of the rolling stock on a first rolling stand facing side of the second rolling stand.

By the lubricant mixture applying device, a lubricant mixture of a carrier gas and a lubricant can be applied to the work rolls of the rolling mill and / or the rolling stock to reduce the friction between the rolling stock and the work rolls of the first rolling stand in the above-mentioned first operation mode. Compared to the use of a lubricating emulsion, the use of a lubricating mixture of a carrier gas and a lubricant has several advantages. On the one hand, this can reduce the lubricant consumption, since less lubricant is required for the production of the lubricating mixture which is sprayed directly onto the work rolls and / or the rolling stock than for the production of a lubricating emulsion. On the other hand eliminates the costly production and reprocessing of the lubricating emulsion, which is usually used for lubrication.

The coolant applying device allows cooling of the work rolls of the first rolling stand and the rolling stock by a coolant. The use of cooling water as a coolant has several advantages over the use of a cooling emulsion. In principle, a cooling emulsion can be used only above a certain minimum temperature, for example above approximately 40 ° C., in order to prevent mold formation and / or blockage of lines. Cooling water, in contrast, can be used at lower temperatures, for example at about 20 ° C., which produces a correspondingly better cooling effect in comparison with a lubricating emulsion. On the other hand eliminates the laborious preparation and recycling of the cooling emulsion that is commonly used for cooling.

The skin pass application device allows the rolling of the rolling stock by using the skin pass through the second rolling stand in the first operating mode or by both rolling stands in the second operating mode.

Embodiments of the invention provide that the lubricant is a first rolling oil, and / or that the carrier gas is air. Suitable rolling oils for lubricating a nip are known and commercially available. Air is particularly advantageous as a carrier gas, since it is inexpensive and environmentally friendly.

A further embodiment of the invention provides that the pulper is an emulsion containing a second rolling oil and water. Suitable such tempering agents are known and commercially available.

A further embodiment of the invention provides that the Schmiergemischaufbringvorrichtung has at least one sputtering device to which the carrier gas and the lubricant are supplied and which is formed for generating the lubricating mixture of the carrier gas and the lubricant. This allows the production of the lubricating mixture by the Schmiergemischaufbringvorrichtung, so that no lubricant mixture must be kept.

A further embodiment of the invention provides that the Schmiergemischaufbringvorrichtung has a plurality of spray nozzles, which lubricating mixture can be fed and which are designed to output the lubricating mixture. As a result, the lubricant mixture can be selectively applied and distributed by spray nozzles.

A further embodiment of the invention provides that the rolling stands for each work roll have at least one support roll and the rolling device has a cleaning fluid application device for applying a cleaning fluid to at least one support roll. The cleaning fluid used is, for example, water or a cleaning emulsion. For example, the cleaning fluid applying apparatus has a plurality of cleaning nozzles for discharging the cleaning fluid. The cleaning fluid applying apparatus enables cleaning of the back-up rollers from abrasion accumulating on roller surfaces of the back-up rollers. This cleaning is advantageous because abrasion particles are formed during the skin pass through the roughening of the rolling stock surface, which would increasingly contaminate the rolling stock without the cleaning. In addition, as stated above, the rolling apparatus is preferably located at the end of the process route where the requirement for cleanliness of the rolling stock is particularly high.

A further embodiment of the invention provides a coolant circuit to which the coolant application device is connected and which has for each rolling stand a collecting device for collecting coolant that drips off the rolling stand, and a coolant treatment device for cleaning the coolant collected by the collecting devices. This embodiment of the invention allows a reuse of the coolant and thereby advantageously reduces the coolant consumption.

In the method according to the invention for operating a rolling device according to the invention, in a first operating mode, the lubricating mixture is directed to a side of at least one work roll of the first rolling stand facing away from the second rolling stand and / or onto at least one rolling material surface of the rolling stock on a side of the first rolling stand facing away from the second rolling stand and the coolant is applied to a side of at least one work roll of the first rolling stand facing the second rolling stand and / or onto at least one rolling material surface of the rolling stock on a side of the first rolling stand facing the second rolling stand. In a second operating mode, the skin pass agent is at least one side of the first rolling stand facing away from the second rolling stand and / or at least one rolled material surface of the rolling stock on a side of the first rolling stand facing away from the second rolling stand and at least one side facing the first rolling stand a work roll of the second rolling stand or / and applied to at least one Walzgutoberfläche of the rolling stock on a side facing the first rolling mill side of the second rolling stand. The advantages of the method according to the invention emerge from the abovementioned advantages of the rolling device according to the invention.

An embodiment of the method provides that, in the first operating mode, the skin-piercing agent is applied to a side of at least one working roll of the second rolling stand facing the first rolling stand and / or to at least one rolling-material surface of the rolling stock on a side of the second rolling stand facing the first rolling stand. This embodiment allows the rolling of the rolling stock in the first mode of operation using a tempering agent.

FIG 1

schematisch eine Walzvorrichtung gemäß dem Stand der Technik,

FIG 2

schematisch eine erfindungsgemäße Walzvorrichtung.

The above-described characteristics, features, and advantages of this invention, as well as the manner in which they will be achieved, will become clearer and more clearly understood in connection with the following description of exemplary embodiments which will be described in detail in conjunction with the drawings. Showing:

FIG. 1

schematically a rolling device according to the prior art,

FIG. 2

schematically a rolling device according to the invention.

Corresponding parts are provided in the figures with the same reference numerals.

FIG. 1 schematically shows a rolling device 1 for rolling a rolling stock 3 according to the prior art. The rolling device 1 has two rolling stands 5, 7, which are arranged one behind the other in a rolling direction 9. Each roll stand 5, 7 has two work rolls 11 and for each work roll 11, a support roller 13. The two work rolls 11 of a roll stand 5, 7 are spaced from each other by a nip 15, through which the rolling stock 3 is guided. The back-up roll 13 of a work roll 11 is arranged on a side of the work roll 11 facing away from the roll gap 15.

The rolling apparatus 1 further includes a lubrication emulsion applying device 17, a cooling emulsion applying device 19, and a temper rolling agent applying device 21.

The rolling apparatus 1 is operated in two different operating modes. In a first mode of operation, the thickness of the rolling stock 3 in a first rolling stand 5, which is arranged in the rolling direction 9 in front of the second rolling stand 7 and is thus traversed by the rolling stock 3 before the second rolling stand 7, is significantly reduced, for example by more than three Percent compared to the thickness of the rolling stock 3 before the first rolling stand 5. In the second rolling stand 7, however, the rolling stock 3 is mainly trained, that is, a desired surface roughness of the rolling stock 3 is produced, the thickness of the rolled stock 3 is only slightly reduced, For example, by less than three percent compared to the thickness of the rolling stock 3 before the second rolling stand 7. In the second mode of operation, the rolling stock 3 in both rolling stands 5, 7 on the other hand trained without significant reduction in thickness.

With the lubricating emulsion application device 17, a lubricating emulsion is applied to the rolling stock 3 in the first operating mode in front of the first rolling stand 5. The lubricating emulsion is applied by means of lubrication nozzles 23 of the lubrication emulsion application device 17 to an upper-side rolling-material surface 25 and a lower-side rolling-material surface 27 of the rolling stock 3. The lubricating emulsion contains water and a rolling oil and has a relatively high rolling oil content of, for example, 5% to 30%.

With the cooling emulsion application device 19, in the first operating mode, a cooling emulsion is applied to the work rolls 11 of the first stand 5 or / and to the rolling stock 3. The cooling emulsion is applied by means of cooling nozzles 29 of the cooling emulsion application device 19 to the sides of the work rolls 11 of the first rolling stand 5 facing the second rolling stand 7 and / or to the top side Walzgutoberfläche 25 and the lower side Walzgutoberfläche 27 of the rolling stock 3 on a second rolling stand 7 facing side of the first Roll stand 3 applied.

With the skin applying device 21, a skin-pass agent is applied to the work rolls 11 of the second roll stand 7 or / and in the region of the roll gap 15 of the second roll stand 7 to the rolling stock 3 in both operating modes. The skin-pass agent is applied to the first roll stand 5 facing sides of the work rolls 11 of the second stand 7 and / or on the upper side Walzgutoberfläche 25 and the lower side Walzgutoberfläche 27 of the rolling stock 3 on a first rolling stand 5 side facing the second by means of tempering 31 of the skin pass mill Roll stand 7 applied. The tempering agent is a tempering emulsion containing water and a rolling oil, wherein the tempering emulsion having a smaller rolling oil content and a different rolling oil than the lubricating emulsion.

Furthermore, with the skin-applying device 21 in the second operating mode, the skin-pass agent is also applied to the work rolls 11 of the first roll stand 7 and / or in the region of the roll gap 15 of the first roll stand 7 onto the rolling stock 3. The tempering agent is applied to the side facing away from the second stand 7 of the work rolls 11 of the first stand 5 and / or to the top side Walzgutoberfläche 25 and the lower side Walzgutoberfläche 27 of the rolling stock 3 on a side remote from the second stand 7 by means of further tempering nozzles 31 of the skin pass mill Side of the first rolling stand 5 applied.

The rolling apparatus 1 further comprises a cleaning fluid applying device 33 for applying a cleaning fluid to supporting rollers 13 of the rolling stands 5, 7 to clean the back-up rollers 13 of abrasion collecting on the roller surfaces of the back-up rollers 13. The cleaning fluid is discharged onto the back-up rollers 13 by means of cleaning nozzles 35 of the cleaning fluid applying device 33. In FIG. 2 only cleaning nozzles 35 for the above the work rolls 11 arranged support rollers 13 are shown. However, the Reinigungsfluidaufbringvorrichtung 33 may additionally have additional cleaning nozzles 35 for the arranged below the work rolls 11 back-up rollers 13. The cleaning fluid used is, for example, water or a cleaning emulsion.

FIG. 2 shows a rolling device according to the invention 1. This rolling device 1 differs from the in FIG. 1 shown rolling device 1 in that it has a Schmiergemischaufbringvorrichtung 37 instead of the Schmieremulsionsaufbringvorrichtung 17. Further, the rolling device 1 has a coolant applying device 39 on, from which a coolant can be dispensed, which is either cooling water or a cooling emulsion.

Also in FIG. 2 shown rolling device 1 is operated in two different operating modes. In a first operating mode, in turn, the thickness of the rolling stock 3 is appreciably reduced in the first rolling stand 5, for example by more than three percent compared to the thickness of the rolling stock 3 in front of the first rolling stand 5, and in the second rolling stand 7 the rolling stock 3 is primarily dressed, wherein the thickness of the rolling stock 3 is reduced only slightly, for example by less than three percent compared to the thickness of the rolling stock 3 before the second rolling stand 7. In the second operating mode, the rolling stock 3 in both rolling stands 5, 7 of the rolling device 1 again without substantial Thickness reduction trained.

With the Schmiergemischaufbringvorrichtung 37 in the first mode of operation, a lubricant mixture on the side facing away from the second stand 7 of the work rolls 11 of the first stand 5 and / or on the upper side Walzgutoberfläche 25 and the lower side Walzgutoberfläche 27 of the rolling stock 3 on one of the second stand 7th facing away from the first rolling stand 5 applied. The lubricating mixture is a mixture of a carrier gas and a lubricant. As a carrier gas, for example, air is used. As a lubricant, for example, a rolling oil is used. The Schmiergemischaufbringvorrichtung 37 has for each Walzgutoberfläche 25, 27 to a sputtering device 41, the carrier gas via a carrier gas line 43 and the lubricant via a lubricant line 45 are supplied and which is formed for generating the lubricating mixture of the carrier gas and the lubricant. Further, the Schmiergemischaufbringvorrichtung 37 a plurality of spray nozzles 47, which each supplied by a sputtering device 41 lubricating mixture can be fed. The of a sputtering device 41 with the Lubricating mixture fed spray nozzles 47 are distributed over a width of the rolling stock 3 and spray the rolling stock 3 along its width evenly with the lubricating mixture on the respective Walzgutoberfläche 25, 27th

In the first operating mode, coolant (cooling water or a cooling emulsion) is applied to the work rolls 11 of the first roll stand 5 or / and to the rolling stock 3 with the coolant application device 39. The coolant is directed by means of coolant nozzles 49 of the coolant application device 39 onto the sides of the work rolls 11 of the first rolling stand 5 facing the second rolling stand 7 and / or onto the top side of the rolling stock 25 and the underside rolling surface 27 of the rolling stock 3 on a side of the first side facing the second rolling stand 7 Roll stand 3 applied.

Furthermore, the rolling device 1 has a skin-applying device 21 and a cleaning fluid application device 33, which, as in FIG FIG. 1 shown rolling device 1 are formed and used and therefore will not be described again here.

The rolling apparatus 1 further has a coolant circuit 51 to which the coolant applying device 39 is connected. The coolant circuit 51 has, for each rolling stand 5, 7, a catcher 53 for catching coolant dripping from the rolling stand 5, 7 and a coolant conditioner 55 for cleaning the coolant caught in the catchers 53. When cleaning the coolant in the coolant treatment device 55, for example, a rolling oil of the lubricating mixture and / or other substances, such as substances from the rolling stock 3, the Work rolls 11 and / or the backing rollers 13 were rubbed away from the coolant.

While the invention has been further illustrated and described in detail by way of preferred embodiments, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

1

rolling device

3

rolling

5, 7

rolling mill

9

rolling direction

11

Stripper

13

supporting roll

15

nip

17

Schmieremulsionsaufbringvorrichtung

19

Kühlemulsionsaufbringvorrichtung

21

Dressiermittelaufbringvorrichtung

23

lubrication nozzle

25, 27

rolling stock

29

cooling nozzle

31

Dressierdüse

33

cleaning fluid

35

cleaning nozzle

37

Schmiergemischaufbringvorrichtung

39

Kühlwasseraufbringvorrichtung

41

atomizer

43

Carrier gas line

45

lubricant line

47

spray nozzle

49

coolant nozzle

51

Coolant circuit

53

catcher

55

Cooling water treatment device

Claims (13)

Rolling device (1) for rolling a rolling stock (3) comprising the rolling device (1) a first rolling stand (5) and a second rolling stand (7) spaced from the first rolling stand (5), each rolling stand (5, 7) being guided through a nip (15) through which the rolling stock (3) can be guided having spaced work rolls (11), - A Schmiergemischaufbringvorrichtung (37) for applying a lubricant mixture of a carrier gas and a lubricant on a side facing away from the second rolling stand (7) side of at least one work roll (11) of the first rolling mill (5) and / or on at least one Walzgutoberfläche (25, 27 ) of the rolling stock (3) on a side remote from the second rolling stand (7) side of the first rolling stand (5), a coolant application device (39) for applying a coolant to a second roll stand (7) facing side of at least one work roll (11) of the first roll stand (5) and / or on at least one Walzgutoberfläche (25, 27) of the rolled stock (3) on a second rolling stand (7) facing side of the first rolling mill (5), and a skin-applying means (21) for applying a skin-pass agent to a side of at least one work roll (11) of the first roll stand (5) and / or on at least one rolling-material surface (25, 27) of the rolled stock (3) facing away from the second roll stand (7). on a side of the first rolling stand (5) facing away from the second rolling stand (7) and on at least one work roll (11) of the second rolling stand (7) and / or on at least one rolling stock surface (25, 27) of the rolling stock (3) on a first rolling stand (5) facing side of the second rolling stand (7). Rolling device (1) according to claim 1,
characterized in that the lubricant is a first rolling oil. Rolling device (1) according to claim 1 or 2,
characterized in that the carrier gas is air. Rolling device (1) according to one of the preceding claims,
characterized in that the pulper is an emulsion containing a second rolling oil and water. Rolling device (1) according to one of the preceding claims,
characterized in that the coolant is cooling water or a cooling emulsion. Rolling device (1) according to one of the preceding claims,
characterized in that the lubricating mixture applying device (37) comprises at least one atomizing device (41) to which the carrier gas and the lubricant are supplied and which is formed to produce the lubricating mixture of the carrier gas and the lubricant. Rolling device (1) according to one of the preceding claims,
characterized in that the Schmiergemischaufbringvorrichtung (37) comprises a plurality of spray nozzles (47), which lubricant mixture can be supplied and which are designed to output the lubricant mixture. Rolling device (1) according to one of the preceding claims,
characterized in that the rolling stands (5, 7) for each work roll (11) comprise at least one support roll (13) and the rolling device (1) comprises a cleaning fluid application device (33) for applying a Cleaning fluid on at least one support roller (13). Rolling device (1) according to claim 8,
characterized in that the cleaning fluid is water or a cleaning emulsion. Rolling device (1) according to claim 8 or 9,
characterized in that the cleaning fluid applying device (33) has a plurality of cleaning nozzles (35) for discharging the cleaning fluid. Rolling device (1) according to one of the preceding claims,
characterized by a coolant circuit (51) to which the Kühlmittelaufbringvorrichtung (39) is connected and for each rolling stand (5, 7) a collecting device (53) for collecting coolant, which drips from the rolling stand (5, 7), and a Coolant processing device (55) for cleaning the captured by the collecting devices (53) coolant. Method for operating a rolling device (1) designed according to one of the preceding claims, wherein - In a first mode of operation, the lubricant mixture on one of the second rolling stand (7) facing away from at least one work roll (11) of the first stand (5) and / or at least one Walzgutoberfläche (25, 27) of the rolling stock (3) on one of The second roll stand (7) facing away from the first roll stand (5) is applied and the coolant to at least one work roll (11) of the first stand (5) and / or at least one Walzgutoberfläche (25 , 27) of the rolling stock (3) on a second rolling stand (7) facing side of the first rolling mill (5) is applied, or in a second mode of operation, the skin pass agent is directed onto a side of at least one work roll (11) of the first rolling stand (5) and / or onto at least one rolled material surface (25, 27) of the rolling stock (3) on one of the second rolling stand (7) facing away from the first roll stand (5) and on a first rolling stand (5) facing side of at least one work roll (11) of the second rolling stand (7) and / or at least one Walzgutoberfläche (25, 27) of the Walzguts (3) on a first rolling mill (5) facing side of the second rolling mill (7) is applied. Method according to claim 12,
characterized in that in the first mode of operation, the skin pass on a first rolling mill (5) facing side of at least one work roll (11) of the second rolling stand (7) and / or on at least one Walzgutoberfläche (25, 27) of the rolling stock (3) a side of the second rolling stand (7) facing the first rolling stand (5) is applied.

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