RU2574550C1 - Method and device for rolled material rolling - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: method includes application of the lubricating-cooling material on water base on the rolled material and/or roller forming area of deformation during rolling. To the lubricating-cooling material of water base prior to application on the rolled material and/or roller the water soluble tribologically active additive is added. The excessive the lubricating-cooling material after application on the rolled material and/or roller is caught and re-used for application on the rolled material and/or roller. The excessive the lubricating-cooling material after its catching prior to re-application is subjected to ultrafiltration.

EFFECT: additional quality increasing of the rolled material surface.

12 cl, 1 dwg

Description

Technical field

The invention relates to a method and apparatus for rolling rolled material. The method and apparatus are preferably used in cold rolling.

State of the art

During cold and hot rolling of metal strips, as a rule, fluids (fluids) are supplied to the rolls and / or rolled material to cool the rolls and strips in order to lubricate the working gap, as well as to provide the possibility of cleaning the roll and strip. These fluids are commonly referred to as cooling lubricants.

In the cooling function of the rolls and strips, lubricating and cooling materials serve, especially during cold rolling, to remove the heat of transformation, as well as the heat of friction. When lubricating the working gap in the deformation zone during rolling, lubricating and cooling materials are used to regulate the tribological conditions in the deformation zone between the rollers accordingly and, thus, to ensure the proper surface quality of the rolled material. With respect to the cleaning function, cutting lubricants are used to clean the roll and rolled material, as well as to remove dirt particles in order to achieve good surface quality of the rolled strip.

In addition, cutting fluids may have an effect on the conditioning of the strip. Lubricating and cooling materials, in addition, are installed in such a way that they are compatible with upstream and downstream devices in the processing chain when processing the rolled material, for example, in terms of corrosion protection, in relation to cleaning at other stages of the process and / or in relation to preventing changes the colors of the rolled strip, for example, during annealing. In addition, it is desirable that the properties of the cooling lubricant remain substantially stable during its use and that no degradation occurs over time.

This gives a list of requirements for lubricant-cooling materials, namely, they must provide the possibility of high heat capacity and good heat transfer, they must provide sufficient formation of a lubricating film to achieve the state of mixed friction using a lubricant-cooling material adapted to the viscosity process, they must allow to establish the boundary state of friction adapted to the process and they should have a good cleaning effect with good filterability at the same time.

The latter aspect is especially important, because circulation systems are usually used for the use of cutting lubricants, and the removed dirt particles must be removed again from the circulation circuit of the cooling lubricant to ensure good surface quality of the rolled strip when re-supplying the lubricant already used before -cooling material.

Accordingly, in the prior art, in industrial practice of cold rolling, lubricant-cooling materials are usually used, which are used either as single-phase oil-based lubricant-cooling materials, or in the form of water-based lubricant-cooling materials of liquids with dispersed oil-based drops, which are then in the form of emulsions.

Compared to water-based systems, purely oil-based lubricating and cooling materials have the disadvantage of flammability as well as poor heat transfer and low heat capacity. Due to this, the productivity of the rolling plants operated in this way is rather limited.

Emulsions may have disadvantages in that the oil-based droplets in the emulsion must first settle on the respective surfaces of the roll or on the surfaces of the rolled material, so that the active lubricants contained in them and the increased viscosity of the oil phase can exert their effect. Before entering the working gap of the deformation zone, it is desirable to separate the continuous phase from the tribologically active substance. This leads to a delay in the effect, due to which either the rolling speed limit is reached, or the distance between the rolling stands must be increased to achieve the required exposure time.

The lack of emulsions, in addition, is an unsatisfactory degree of ultrafine filtration (purification).

In the following description, the terms “ultrafine filtration” or “ultrafine filtration” are used to explain that, in contrast to “filtration” and “fine filtration”, that part of the spectrum of particles in which the greatest length in an individual particle is less than 5 microns is also captured.

Particles of dirt that are less than or equal to the order of magnitude of the oil droplets in the emulsion cannot be removed from the cooling lubricant without removing the oil phase from the cooling lubricant. The properties of water-based lubricant-cooling materials with dispersed oil-based droplets may also be degraded due to mechanical, biological or chemical effects.

In the future, for simplicity, the term “degradation” is used when an adverse change in a product’s properties is indicated, without a detailed description of the changes in the underlying mechanism, or without a restrictive indication of the scientific classification in terms of the physical, chemical, technological, physiological, olfactory, or any other property of the product.

In relation to the subject matter of the invention, reference may be made to the following prior art publications: DE 10107567 A1, DE 102004061939 B3, DE 102005042020 A1, DE 19621837 C1 and EP 0839895 A2.

In addition, German patent application DE 10143407 A1 discloses a method and apparatus for cold rolling strips, including stainless steels. The installation is a multi-stand continuous rolling mill, with the first stands rolling with relatively high compression, and the last stand with relatively low compression determines the quality of the strip surface. In the first stands with relatively high compression (thinning), an emulsion is used as a lubricant-cooling material, for which ultra-fine filtration is not provided. In contrast, in the last stand of a continuous rolling mill with relatively low compression, rolling oil is used as a lubricant, and this rolling oil is subjected to ultra-fine filtration to ensure high surface quality.

Finally, GB 729615 also discloses a method and apparatus for rolling rolled material, wherein a water-based lubricant-cooling material is applied to the rolled material and / or at least one of the work rolls. The water-based lubricant-cooling material is enriched before application with a water-soluble tribologically active additive, and the lubricant-cooling material enriched in this way is captured at the exit of the rolling stand, so that it can then be reused, i.e. reapplied.

SUMMARY OF THE INVENTION

The present invention is to further improve the known method and known device for rolling the rolled material in such a way as to further improve the surface quality of the rolled material.

This problem is solved using the method according to paragraph 1 of the claims. This method is characterized in that the excess lubricant-cooling agent after its capture, but before its re-application is subjected to ultrafine filtration.

Accordingly, a method for rolling a rolled material is provided, wherein a water-based lubricant-cooling material is applied to the rolled material and / or at least one roll forming a hot spot during rolling. In accordance with the invention, at least one water-soluble viscosity-modifying additive, as well as lubricating properties in the working gap in deformation processes, hereinafter referred to as “water-based lubricant-cooling material, before being applied to the rolling material and / or at least one roll,” tribologically active "additive.

Due to the fact that a water-soluble tribologically active additive is added to the water-based lubricant, ultrafine filtration can be implemented, so that excess lubricant-cooling material without loss of tribological effectiveness can be subjected to ultrafine filtration. Thus, excess cutting fluid can be reused and fed back into the circulation circuit of the cutting fluid. Due to the ultrafine filtration, a high surface quality of the rolled material can be simultaneously achieved, since the abrasion product during rolling is properly removed and removed from the circulation circuit of the cooling lubricant.

Due to the high water content of the cutting fluid, the risk of fire is significantly reduced compared to the use of cutting fluids based on oils or oil-containing emulsions. In addition, due to the use of a water-soluble tribologically active additive, it can be achieved that the active lubricating effect of the corresponding lubricating cooling material appears in a relatively short time after its application to the surface of the roll or to the surface of the rolled material, since there is no time delay due to separation phases, manifested in emulsion or dispersion, before entering the working gap during deformation.

In addition, by using a water-soluble tribologically active additive compared to using oil-based lubricants, it is achieved that for some applications, such as high-speed aluminum rolling, viscosity ranges that are not available when using lubricant-coolants can also be used. oil-based materials or impractical in industrial production conditions. This applies in particular to materials having a kinematic viscosity of less than 1.8 mm ² / s at 40 ° C.

With a suitable choice of a water-soluble tribologically active additive, the lubricating-cooling material can be adapted to the corresponding individual case of rolling, that is, for example, to the rolled steel or rolled material, as well as to the rolling conditions in the deformation zone.

Due to the targeted selection of a water-soluble tribologically active additive, a targeted, dependent on the case of rolling installation of tribological conditions in the deformation zone can also be achieved.

Preferably, a water-based lubricant-cooling material together with a water-soluble tribologically active additive, depending on the rolling case, is applied to the material being rolled and / or to the rolls forming the deformation zone, preferably by setting application conditions, in particular, preferably by changing the temperature of the feed material, pressure application, type of application, as well as the place of application. Accordingly, a certain concentration or layer thickness of a water-soluble tribologically active additive is achieved on the material being rolled and / or on the corresponding roll (s) in order to be able to establish appropriate tribological conditions in the deformation zone.

In order to effectively form a lubricant-cooling material circulation loop, excess lubricant-cooling material is captured after being applied to the rolled material and / or roll, then it is subjected to ultrafine filtration, and then the ultrafine-filtered lubricant-cooling material is reused as a lubricant-cooling material for application to rolled material and / or roll. Due to the ultrafine filtration, the products of abrasion during rolling and other foreign particles are carried away from the lubricant-cooling material, and the lubricant-cooling material can be reused without loss of quality. Thus, the efficient use of cutting lubricant can be performed.

In this regard, it is particularly preferable to add at least one water-soluble tribologically active additive to the ultrafine filtered lubricant before re-applying it to the rolling material and / or roll in order to re-achieve the initial desired concentration of the additive in the lubricant-cooling material. This is preferably done based on the determination of the depletion or enrichment of this additive, the depletion being preferably determined by continuously measuring the relative dielectric constant and / or electrical conductivity of the collected cooling lubricant.

In a preferred embodiment, the deposition of the additive on the rolled material and / or at least one roll is determined by evaluating the measured data of the rolling process using a suitable tribological process model, and the addition of a water-soluble tribologically active additive is controlled so that the desired deposition of the additive is achieved. In this way, it is possible to determine the necessary concentration of the additive in the cooling lubricant and appropriately add a water-soluble tribologically active additive to the flow of the cooling lubricant.

The deposition of the additive onto the rolled material leaving the deformation zone is determined by the additive layer remaining on the rolled material, and the addition of a water-soluble tribologically active additive is controlled or controlled so that the desired remaining deposition of the additive is achieved.

In an additional embodiment of the method, the addition of a water-soluble tribologically active additive is carried out on the basis of continuous measurement of particles of the product of abrasion during rolling in the collected lubricant-cooling material. This is preferably done in the form of continuous and online particle measurement, classification into rolling-relevant size classes using a database for comparison, which includes roll material, roll roughness, type of rolls, rolled material, alloying, rolling table and corresponding process model , and in accordance with this, control or regulation of the composition of the cutting fluid is carried out.

In yet another preferred embodiment, at least one additional water-soluble additive is metered into the lubricant-cooling material, preferably in order to balance the effect of the lubricant-cooling material between the cleaning effect and the lubricating effect, preferably depending on the desired and achieved surface appearance, for example, determined by the degree of gloss, roughness, print or texture. The concentration of a particular water-soluble additive is thus determined purposefully continuously, preferably by spectrometry and / or continuous measurement of the relative dielectric constant and / or electrical conductivity of the coolant.

In a further embodiment of the method, a different amount of water-soluble tribologically active additive is added to the lubricant-cooling material deposited on the upper side of the rolled material and / or the upper roll compared to the lubricant-cooling material that is applied to the lower side of the rolled material and / or lower roll. In this way, a different surface appearance of the material being rolled is achieved, so that the upper side and the lower side have different properties, such as, for example, a different surface appearance.

In another embodiment, the amount of added water-soluble tribologically active additive changes over time. Thus, the so-called "workpieces with predetermined characteristics" can be produced, in which case within the limits of a single, continuously rolled material various properties of the material and, in particular, various surface properties are achieved.

The above problem is also solved using a device with the characteristics of paragraph 11 of the claims. Preferred embodiments are presented in dependent claim 12.

Accordingly, a device is proposed for rolling a rolled material in a deformation zone formed by rolls, wherein a water-based lubricant-cooling material is applied to the rolled material and / or at least one roll forming a deformation zone. According to the invention, a water-soluble tribologically active additive is added to the water-based lubricant-cooling material.

Brief Description of the Drawing

Other preferred embodiments and aspects of the present invention will become apparent from the following description of FIG. 1, which schematically shows a side view of a cold rolling mill.

Detailed Description of Preferred Embodiments

Preferred examples are described below with reference to the drawing. In this case, identical, similar or equally acting elements are denoted by identical reference positions, and a repeated description of these elements is partially omitted in order to avoid redundancy in the description.

The rolled material 1 passes through two schematically shown rolling stands 2, 3, each of which has an upper roll 20, 30 and a lower roll 22, 32, each of which is supported by backup rolls 24, 34, 26, 36. Between the respective upper and the lower rolls 20, 22, 30, 32 form the actual focus of deformation 200, 300, in which the deformation of the rolled material 1 occurs.

It should be understood that the shown implementation of the rolling stands, as well as the location of the rolls is only schematic and possibly any other suitable for the corresponding case, the location of the rolls of individual rolling stands.

The rolling stand 2, located first in the rolling direction W, respectively performs the first reduction, followed by rolling stands 3, etc. - subsequent compression.

Lubricant-cooling material is applied to the rolled material 1 before entering the corresponding deformation zone 200, 300 of the rolling stands 2, 3. Lubricant-cooling material is applied to the upper side of the rolled material 1 by means of a spray beam 4 extending across the rolled material 1. To the corresponding a spray beam 4, a cooling lubricant is supplied through supply lines 40 for a cooling lubricant from a 42 reservoir of a cooling lubricant.

In the lower region below the rolled material 1, spray beams 5 are also provided, which are also fed through the supply lines 50 for the cooling lubricant from the cooling lubricant reservoir 52 and are intended for applying the cooling lubricant to the rolling material 1.

Lubricant-cooling material can be directly applied to the rolls 20, 22 in contact with the rolled material 1. For this purpose, the corresponding device is shown schematically in Fig. 1 in the form of spray beams 44, 54, which are respectively located in front of the deformation zone 200 above the rolls 20 , 22.

Below the rolling stands 2, 3 and / or below the spray beams 4, 44, 5, 54, pallets 28, 38 can be provided that trap excess lubricant-cooling material, which again merges from the rolled material 1 and / or rolls 20, 22. By means of pallets 28, 38, the excess cutting fluid can be recaptured and then fed back into the circulation circuit of the cutting fluid. Thus, the cooling lubricant can be reused, and thus more efficiently perform the rolling process.

In FIG. 1, the supply of cutting fluid to the spray beam 4 located on top and the spray beam 5 located on the bottom is performed separately, so that asymmetric coating of the cutting lubricant can take place here so that the corresponding surfaces of the rolled strip 1 on its upper side and its the underside may have a different surface appearance.

Water-soluble tribologically active additives having various properties can, as schematically shown by the metering device 6, be added in a variable manner to the cooling lubricant.

The metering device 6 for the metered addition of water-soluble additives to the lubricant-cooling material, which is applied through the cooling cross members 4, 5, allows the precise setting of the properties of the lubricant-cooling material, which is applied to the rolled material 1 and / or to the rolls that come into contact with the rolled material.

For example, by targetedly adding water-soluble tribologically active additives to a water-based lubricant, the desired tribological properties in the deformation zone are achieved. By appropriately adjusting the addition of water-soluble tribologically active additives, for example, a balance can be further established between the target flushing action and the target lubricating action of the cooling lubricant depending on the desired surface appearance and depending on the desired reduction in the manufacture of strip products from rolled material 1.

In addition, the data of the rolling process from the control and analysis of the deformation zone using a suitable tribological model of the process can be used to control the composition of the additive in the cooling lubricant.

By means of the schematically indicated sensors 70, the deposition of the additive on the strip rolled from the rolled material 1 can be measured after passing through the deformation zone 200. This parameter can also be taken into account when regulating the addition of water-soluble tribologically active additives. Accordingly, using a metering device 6, a mixture of appropriate water-soluble tribologically active additives is established.

Using electrical conductivity sensors or sensors that measure the relative dielectric constant of the lubricant, as, for example, shown schematically using the sensor 72, it is possible to determine the depletion of individual additives in the circulation circuit of the lubricant and, accordingly, the addition of depleted water-soluble additives can be controlled.

In another preferred embodiment, the particles of the abrasion product during rolling can also be measured by the schematically shown sensor 74 and by measuring particles using a database for comparison, which includes roll material, roll surface, rolled material, alloying, rolling conditions, and the corresponding process model, and thus can accordingly reproduce the parametric surface for abrasion products during rolling, respectively, the rolling process is controlled. Adequate control of the dosage of the water-soluble additive by means of the metering device 6 can also be performed in the same way.

The returned circulation of the cooling lubricant collected, for example, by means of two schematically shown pallets 28, 38, after passing through the respective sensors 72, 74, is filtered by ultrafine filtration in the filter 8. The filtering device 8 used preferably provides ultrafine filtration, so that even particles with less than 5 microns in size are removed from the collected lubricant-cooling material, so that it can be re-added without loss of quality when rolled 1 is deformed into the circulation circuit with smear-cooling material.

By performing the spray beam 4 above the strip and the spray beam 5 below the strip, it is possible, on the one hand, to asymmetrically spray the additive from above and below the strip, whereby a different appearance of the strip can be formed.

In addition, the provision of the metering device 6 provides the possibility that water-soluble tribologically active additives can be applied to the rolled material selectively and with time. Thus, a flexible rolling schedule can be maintained and custom-made products can be manufactured with variable properties of the rolled material depending on the width, length and time. For example, strip thickness, surface appearance, surface roughness, wettability, and coatability can be changed in this way.

The lubricant-cooling materials used, respectively, are designed as water-based lubricant-cooling materials, which, with the aid of water-based additives, which include, in particular, viscosity enhancers, which provide sufficient hydrodynamic formation of the lubricating film, good cooling properties, and the required ultra-high the degree of filtration in the range of less than 5 microns, at the same time provide resistance to biodegradation of the lubricating cooling material. By adding water-soluble tribologically active additives to the water-based lubricant-cooling material, it is possible to realize a tribological situation commensurate with the corresponding rolling task in the deformation zone.

In this case, using a viscosity enhancer (thickener), you can adjust the viscosity, which is set in the range that covers typical rolling tasks. For this, in comparison with the use of rolling oils, it is preferable for some applications, for example, for high-speed rolling of aluminum, the required viscosities can be set, which is not possible using currently generally accepted cutting lubricants.

Boundary friction in the deformation zone is achieved by the deposition of special, suitable for plastic deformation by means of rolls, water-soluble tribologically active additives on the surface of the roll and / or rolled material, in particular, strip 1. Accordingly, for this purpose, water-soluble tribologically active additives suitable for the rolling problem are installed , i.e., in particular, suitable for the material and rolling conditions in the deformation zone, and the deposition of the additive on the rolls, roll surfaces and strip can be adjusted atsya by setting and / or change the corresponding conditions of application, for example by changing or adjusting the temperature of the feed material, applying pressure, as well as the nature and location of the cooling-lubricating coating material.

Water-based lubricant-cooling materials with thickeners are known, for example, from the field of machining.

As far as applicable, all individual features that are presented in various exemplary embodiments may be combined with each other and / or replaced without departing from the scope of the present invention.

List of Reference Items

1 rolled material

2 rolling stand

20 upper roll

22 lower roll

24, 26 backup rolls

28 tray for excess cooling lubricant

200 hotbed

3 rolling stand

30 upper roll

32 lower roll

34, 36 backup rolls

38 tray for excess cooling lubricant

300 hotbed

4 top spray beam for rolled material

40 supply pipe for cutting fluid

42 upper coolant reservoir

44 spray beam for the upper roll

5 lower spray beam for rolled material

50 supply pipe for cutting fluid

52 lower coolant reservoir

54 lower roll spray boom

6 dosing device for one or more water-soluble tribologically active additives

70 sensor for deposition of additives

72 conductivity sensor

74 sensor for rolling abrasion product particles

8 filtering device

W rolling direction

Claims (12)

1. A method of rolling the rolled material (1), preferably for cold rolling the rolled material (1), comprising applying a water-based lubricant-cooling material to the rolled material (1) and / or at least one roll (20, 22, 30 , 32), forming a hotbed of deformation (200, 300) during rolling,
moreover, at least one water-soluble tribologically active additive is added to the water-based lubricant-cooling material before application to the rolled material and / or at least one roll, moreover, the excess lubricant-cooling material after application to the rolled material (1) and / or the roll (20, 22, 30, 32) is captured and then the cooling lubricant is reused for application on the rolled material (1) and / or the roll (20, 22, 30, 32);
characterized in that
excess lubricant-cooling material after its collection before its repeated application is subjected to ultrafine filtration. 2. The method according to claim 1, in which at least one water-soluble tribologically active additive is selected suitable for the individual case of rolling, preferably suitable for the rolled material and / or the required tribological conditions in the deformation zone (200, 300). 3. The method according to p. 1, in which a water-based lubricant-cooling material together with a water-soluble tribologically active additive is applied, depending on the rolling conditions, to the material being rolled (1) and / or to the rolls forming a hot spot (200, 300) (20) , 22, 30, 32), preferably by setting the application conditions, particularly preferably by changing the temperature of the feed material, application pressure, type of application, and also the place of application. 4. The method according to any one of paragraphs. 1-3, in which the ultrafine filtration lubricant-cooling material before re-applying to the rolled material (1) and / or roll (20, 22, 30, 32) add at least one water-soluble tribologically active additive to achieve the desired concentration of the additive in a cooling lubricant, preferably based on the determination of depletion of this additive, depletion being preferably determined by continuous measurement of the relative permittivity and / or electrical conductivity spine of the assembled cooling lubricant material. 5. The method according to any one of paragraphs. 1-3, in which the deposition of the additive on the rolled material (1) and / or on at least one roll (20, 22, 30, 32) is determined by evaluating the measured data of the rolling process using the appropriate tribological model of the deformation zone and adding water-soluble tribologically active additives regulate with the ability to achieve the desired deposition of the additive. 6. The method according to any one of paragraphs. 1-3, in which the deposition of the additive on the rolled material (1) leaving the deformation center (200, 300) is determined by the additive layer remaining on the rolled material (1) and the addition of a water-soluble tribologically active additive is controlled or controlled. 7. The method according to any one of paragraphs. 1-3, in which the dosage of the water-soluble tribologically active additive is controlled or controlled based on continuous measurement of particles of the abrasion product during rolling in the assembled cooling lubricant, preferably using for comparison a database that includes roll material, roll roughness, type of rolls , rolled material, alloying, rolling conditions, as well as the corresponding tribological model of the process. 8. The method according to any one of paragraphs. 1-3, in which a different amount of water-soluble tribologically active additive is added to the lubricant-cooling material applied to the upper side of the rolled material (1) and / or the upper roll (20) compared to the lubricant-cooling material that is applied to the lower side rolled material (1) and / or lower roll (22). 9. The method according to any one of paragraphs. 1-3, in which the amount of added water-soluble tribologically active additives change over time. 10. The method according to any one of paragraphs. 1-3, in which at least one additional water-soluble tribologically active additive is metered into the lubricant-cooling material, it is preferable to balance the effect of the lubricant-cooling material between the cleaning effect and the lubricating effect, particularly preferably depending on the desired surface appearance. 11. A device for rolling the rolled material (1), preferably for cold rolling the rolled material (1), in the deformation zone (200, 300) formed by the rolls (20, 22, 30, 32), and a water-based lubricant-cooling material is applied on rolled material (1) and / or on at least one roll forming a hot spot (20, 22, 30, 32) and contains a water-soluble tribologically active additive,
characterized in that
it is equipped with at least one filtering device (8) for ultrafine filtering of the collected cooling lubricant. 12. The device according to claim 11, which is equipped with a metering device (6) for the controlled or controlled addition of a water-soluble tribologically active additive to the cooling lubricant.

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