WO1999051369A1 - Process for adjusting lubricant oil droplet size in an aluminum rolling mill - Google Patents
Process for adjusting lubricant oil droplet size in an aluminum rolling mill Download PDFInfo
- Publication number
- WO1999051369A1 WO1999051369A1 PCT/CA1999/000294 CA9900294W WO9951369A1 WO 1999051369 A1 WO1999051369 A1 WO 1999051369A1 CA 9900294 W CA9900294 W CA 9900294W WO 9951369 A1 WO9951369 A1 WO 9951369A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- droplet size
- emulsion
- rolling
- aluminum
- oil
- Prior art date
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- 238000005096 rolling process Methods 0.000 title claims abstract description 35
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 239000000314 lubricant Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000008569 process Effects 0.000 title claims abstract description 12
- 239000000839 emulsion Substances 0.000 claims abstract description 46
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000007764 o/w emulsion Substances 0.000 claims abstract description 6
- 230000032683 aging Effects 0.000 claims abstract description 4
- 238000003860 storage Methods 0.000 claims abstract description 4
- 230000015556 catabolic process Effects 0.000 claims abstract description 3
- 238000006731 degradation reaction Methods 0.000 claims abstract description 3
- 238000005097 cold rolling Methods 0.000 claims description 3
- 238000005098 hot rolling Methods 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 15
- 229910045601 alloy Inorganic materials 0.000 description 13
- 239000000956 alloy Substances 0.000 description 13
- 230000009467 reduction Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 235000014113 dietary fatty acids Nutrition 0.000 description 5
- 239000000194 fatty acid Substances 0.000 description 5
- 229930195729 fatty acid Natural products 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- -1 fatty acid esters Chemical class 0.000 description 4
- 150000004665 fatty acids Chemical class 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000004094 surface-active agent Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 150000001298 alcohols Chemical class 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 239000000344 soap Substances 0.000 description 3
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 2
- YEVQZPWSVWZAOB-UHFFFAOYSA-N 2-(bromomethyl)-1-iodo-4-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=CC=C(I)C(CBr)=C1 YEVQZPWSVWZAOB-UHFFFAOYSA-N 0.000 description 1
- WPMYUUITDBHVQZ-UHFFFAOYSA-N 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoic acid Chemical compound CC(C)(C)C1=CC(CCC(O)=O)=CC(C(C)(C)C)=C1O WPMYUUITDBHVQZ-UHFFFAOYSA-N 0.000 description 1
- 239000005069 Extreme pressure additive Substances 0.000 description 1
- YSMRWXYRXBRSND-UHFFFAOYSA-N TOTP Chemical group CC1=CC=CC=C1OP(=O)(OC=1C(=CC=CC=1)C)OC1=CC=CC=C1C YSMRWXYRXBRSND-UHFFFAOYSA-N 0.000 description 1
- 125000005907 alkyl ester group Chemical group 0.000 description 1
- 239000007866 anti-wear additive Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000002194 fatty esters Chemical class 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000002563 ionic surfactant Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- FBWNMEQMRUMQSO-UHFFFAOYSA-N tergitol NP-9 Chemical compound CCCCCCCCCC1=CC=C(OCCOCCOCCOCCOCCOCCOCCOCCOCCO)C=C1 FBWNMEQMRUMQSO-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Classifications
-
- 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
- B21B45/0245—Lubricating devices
- B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/001—Aluminium or its alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
Definitions
- the present invention relates to the operation of rolling mills for rolling aluminum (including aluminum alloys) and in particular to the lubrication of the aluminum during the rolling process.
- the optimum particle size of the dispersed oil phase is not the same for all oil-in-water lubricant emulsions and that for a particular lubricant there is an optimum range of particle size which can be determined by experiment.
- Tripathi found that emulsion droplet size in rolling lubricants could be adjusted by chemical means, e.g. by adding a salt to increase the droplet size and adding a soap to decrease the droplet size.
- disadvantages were found in this chemical means for adjusting the droplet size. Firstly, a significant lag time is required from the time of addition of the chemical until the droplet size changes. Secondly, the addition of chemicals to the emulsion over time begin to change the characteristics of the lubricant.
- Hot mills often produce a wide range of alloys. Soft and hard alloys require different lubrication conditions in the mill.
- Conventional hot mills have single coolant/emulsion systems which provide emulsion with one and the same antifriction and anti-wear characteristics irrespective of alloys or passes rolled. This creates a situation in which the mill produces reroll with good and poor surface quality depending on the alloy or reduces productivity by prohibiting certain passes either due to excessive or insufficient friction.
- hot mill emulsions undergo significant aging which changes their performance throughout their life cycle.
- the present invention in its broadest aspect relates to a process for rolling aluminum products in which the aluminum is passed between rolls of a rolling mill and rolling bite friction is controlled by applying to the rolls or less often to the aluminum being rolled a lubricant comprising an oil-in-water emulsion having a specific oil droplet size.
- the oil droplet size is adjusted by either (a) blending the emulsion components from a multi-tank storage or (b) passing a large droplet size emulsion through an homogenizer or mixer to obtain droplets of a desired size.
- the droplet size is selected to optimize the roll bite friction requirements of different sheet aluminum products or rolling mills or to compensate for emulsion degradation due to aging.
- an homogenizer When used, it is preferably in the form of an in-line homogenizer in the lubricant feed line just ahead of the roll bite so that an emulsion of ideal droplet size is continuously delivered to this region of the mill stand.
- the system of this invention is especially valuable when running different alloys through the same hot mill, e.g. automotive alloys of varying hardness.
- a simple adjustment in droplet size is made to ensure continued optimum rolling performance. For instance, harder alloys such as 5182 require tighter, i.e. smaller droplet size, emulsion than do softer alloys.
- the emulsion is preferably formulated such that by the time it returns to a reservoir for pumping again through the circuit, its surface energy level is substantially at the minimum, i.e. the emulsion is at its loosest or largest droplet size.
- This provides the option of setting the homogenizer instantaneously to a variety of energy levels depending upon requirements, e.g. as the energy level increases, the emulsion becomes progressively tighter (smaller droplet size) .
- the alternative of controlling the droplet size by blending emulsion components from multi-tank storage is not as instantaneous as the homogenizer system, but it still represents a much improved system over that described in U.S. Patent 3,783,664. Thus it is still able to quickly adjust the droplet size without the addition of any chemicals that would not be beneficial to the characteristics of the oil-in-water emulsion.
- the oil phase comprises a hydrocarbon oil base, e.g. a mineral oil fraction with viscosities between 1.8 to 600 cSt at 40°C.
- a hydrocarbon oil base e.g. a mineral oil fraction with viscosities between 1.8 to 600 cSt at 40°C.
- the load bearing additives may include fatty acids, fatty acid esters of polyhydric or monohydric alcohols and other esters such as phosphates or borates .
- the surfactants may be either non- ionic or ionic or a combination of thereof.
- the non-ionic surfactants may include ethoxylated alcohols, esters, and fatty esters, alcohols and alkyl phenols.
- the non-ionic surfactants may also originate from polyhydric alcohols which have only some of their hydroxyl group bound by the fatty acid or ethoxylate to form partial esters or ethoxylates, respectively.
- the ionic surfactants may be produced by reacting fatty acids with suitable bases such as amines or inorganic and organometallic basic compounds containing metals.
- the amine-type soap is usually a soap formed from an ethanolamine, which is reacted with some of the fatty acid. It is also usual to incorporate other substances, such as triaryl or trialkyl phosphates (e.g. tricresyl or trioctyl phosphate) , as extreme pressure and anti-wear additive, and antioxidants (such as hindered phenols and amines.
- the average droplet or particle size of the oil phase is either periodically or continuously checked.
- the oil droplet size distribution is then restored to a value within the range of optimum. This is achieved by either varying the degree of homogenizing or varying the blending ratios of emulsion components.
- Tests were conducted on a laboratory hot rolling mill for rolling aluminum.
- the aluminum stock that was used was AAllOO.
- Emulsions were prepared of large droplet size (loose emulsions) and small droplet size (tight emulsion) .
- the loose emulsion had a medium droplet size of 5.5 microns and the tight emulsion had a median droplet size of 1.9 microns .
- the loose "HFR-2" emulsion was prepared comprising a 5% dilution in deionized water of the following composition (w/w %) :
- Igepal ® CO-430 (nonionic alkylphenol ethoxylate surfactant - low HLB * )
- Igepal CO-630 (nonionic alkylphenol ethoxylate surfactant - higher HLB * )
- Irganox ® L135 (3 , 5-di- tert-butyl-4- hydroxyhydrocinnamic acid, C7-9 branched alkyl esters)
- a tight emulsion was prepared in the same manner as above except that each emulisifier, e.g. Igepal CO, was present at a level of 3%, thus reducing the hydrocarbon oil mix to 52.5% of the total.
- each emulisifier e.g. Igepal CO
- the mill was operated at three different rolling speeds (20, 60 and 100 RPM) , two slab entry temperatures (300 and 500°C) and two reductions (20 and 50%) .
- the emulsion were applied to the aluminum alloy before the rolls and the "forward slip" results obtained are shown in Table 1 below:
- Forward slip occurs during rolling, and reflects the speed difference between the roll and sheet. It is a significant process phenomenon because it arises as an effect of friction. High forward slip usually indicates high friction while low forward slip indicates low friction. Thus, “positive forward slip” means that the strip speed is faster than the roll speed i.e. caused by the metal exiting the roll bite at a faster rate than it enters due to the reduction in thickness occurring during rolling; “negative forward slip” means that the strip speed is slower than the roll speed i.e. caused by skidding between the rolls and strip.
- the results indicate that, at a 300°C slab entry temperature, there is a relationship between friction and emulsion oil droplet size. During 8 rolling at 50% reduction, forward slip was significantly lower with the loose than with the tight emulsions. On the other hand, at 20% reduction the trend was opposite.
- the function of a rolling emulsion is to lower the forward slip to an acceptable level. While this is partially alloy dependant, it is often around 5% positive slip.
- Control of forward slip by mechanically adjusting oil droplet size distribution according to the invention provides significant practical benefits, because excessively high forward slip can lead to surface quality defects on the slab, while negative forward slip can prevent rolling and introduce other types of surface defects due to skidding the rolls on the strip.
- the invention can be used to adjust the forward slip ultimately to the optimum level for each alloy being rolled.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Lubricants (AREA)
Abstract
A process is described for rolling aluminum products in which the aluminum is passed between rolls of a rolling mill and rolling bite friction is controlled by applying to the rolls or less often to the aluminum being rolled a lubricant comprising an oil-in-water emulsion having a specific oil droplet size. According to the novel feature, the oil droplet size is adjusted by either (a) blending the emulsion components from a multi-tank storage or (b) passing a large droplet size emulsion through an homogenizer or mixer to obtain droplets of a desired size. The droplet size is selected to optimize the roll bite friction requirements of different sheet aluminum products or rolling mills or to compensate for emulsion degradation due to ageing.
Description
Process for Adjusting Lubricant Oil Droplet Size in an Aluminum Rolling Mill
Technical Field
The present invention relates to the operation of rolling mills for rolling aluminum (including aluminum alloys) and in particular to the lubrication of the aluminum during the rolling process. Background Art
It is well known in the rolling of aluminum to employ a rolling lubricant in the form of an oil-in-water emulsion. For example, Dowd et al . U.S. Patent 3,192,752, issued July 6, 1965, describes the use of an oil-in-water emulsion as both the coolant and the source of oily lubricant in the continuous cold rolling of aluminum strip in a multi-stand rolling mill. In this process, an oily lubricant of given composition is sprayed onto the strip and the rolls at the entry side of each mill stand. In Tripathi, U.S. Patent 3,783,664, issued January 8, 1974, it is disclosed that the change in behaviour of a lubricant during its service life is due to changes in the average particle size. Thus, it was recognized that the optimum particle size of the dispersed oil phase is not the same for all oil-in-water lubricant emulsions and that for a particular lubricant there is an optimum range of particle size which can be determined by experiment. Tripathi found that emulsion droplet size in rolling lubricants could be adjusted by chemical means, e.g. by adding a salt to increase the droplet size and adding a soap to decrease the droplet size. However, disadvantages
were found in this chemical means for adjusting the droplet size. Firstly, a significant lag time is required from the time of addition of the chemical until the droplet size changes. Secondly, the addition of chemicals to the emulsion over time begin to change the characteristics of the lubricant.
Currently, oil-in-water emulsions are used to hot roll aluminum ingot and slab to produce reroll. Hot mills often produce a wide range of alloys. Soft and hard alloys require different lubrication conditions in the mill. Conventional hot mills have single coolant/emulsion systems which provide emulsion with one and the same antifriction and anti-wear characteristics irrespective of alloys or passes rolled. This creates a situation in which the mill produces reroll with good and poor surface quality depending on the alloy or reduces productivity by prohibiting certain passes either due to excessive or insufficient friction. Moreover, due to rolling conditions, the chemical nature of lubricants and metal rolled, and mill construction, hot mill emulsions undergo significant aging which changes their performance throughout their life cycle.
There remains a need for a system to allow adjustment of lubricant emulsion droplet size such as to allow optimization of friction in response to current or computer-projected mill requirements. In this way, there could be a reduction in the number of hot mill passes required to achieve a final gauge of slab, an increase in the rolling speed and or the amount of reduction in the
tandem mill, and an improved quality of rolled product could be obtained. Disclosure of the Invention
The present invention in its broadest aspect relates to a process for rolling aluminum products in which the aluminum is passed between rolls of a rolling mill and rolling bite friction is controlled by applying to the rolls or less often to the aluminum being rolled a lubricant comprising an oil-in-water emulsion having a specific oil droplet size. According to the novel feature of the present invention, the oil droplet size is adjusted by either (a) blending the emulsion components from a multi-tank storage or (b) passing a large droplet size emulsion through an homogenizer or mixer to obtain droplets of a desired size. The droplet size is selected to optimize the roll bite friction requirements of different sheet aluminum products or rolling mills or to compensate for emulsion degradation due to aging.
When an homogenizer is used, it is preferably in the form of an in-line homogenizer in the lubricant feed line just ahead of the roll bite so that an emulsion of ideal droplet size is continuously delivered to this region of the mill stand. The system of this invention is especially valuable when running different alloys through the same hot mill, e.g. automotive alloys of varying hardness. Thus, rather than having to use a different emulsion blend for each alloy, a simple adjustment in droplet size is made to ensure continued optimum rolling performance. For instance, harder alloys such as 5182 require tighter, i.e. smaller droplet size, emulsion than do softer alloys.
The emulsion is preferably formulated such that by the time it returns to a reservoir for pumping again through the circuit, its surface energy level is substantially at the minimum, i.e. the emulsion is at its loosest or largest droplet size. This provides the option of setting the homogenizer instantaneously to a variety of energy levels depending upon requirements, e.g. as the energy level increases, the emulsion becomes progressively tighter (smaller droplet size) . The alternative of controlling the droplet size by blending emulsion components from multi-tank storage is not as instantaneous as the homogenizer system, but it still represents a much improved system over that described in U.S. Patent 3,783,664. Thus it is still able to quickly adjust the droplet size without the addition of any chemicals that would not be beneficial to the characteristics of the oil-in-water emulsion.
In a typical oil-in-water lubricant composition for use in this invention, the oil phase comprises a hydrocarbon oil base, e.g. a mineral oil fraction with viscosities between 1.8 to 600 cSt at 40°C. Into this oil base are dissolved load bearing additives and surfactants (wetting agents and emulsifiers) . The load bearing additives may include fatty acids, fatty acid esters of polyhydric or monohydric alcohols and other esters such as phosphates or borates . The surfactants may be either non- ionic or ionic or a combination of thereof. The non-ionic surfactants may include ethoxylated alcohols, esters, and fatty esters, alcohols and alkyl phenols. The non-ionic surfactants may also originate from polyhydric alcohols
which have only some of their hydroxyl group bound by the fatty acid or ethoxylate to form partial esters or ethoxylates, respectively. The ionic surfactants may be produced by reacting fatty acids with suitable bases such as amines or inorganic and organometallic basic compounds containing metals. The amine-type soap is usually a soap formed from an ethanolamine, which is reacted with some of the fatty acid. It is also usual to incorporate other substances, such as triaryl or trialkyl phosphates (e.g. tricresyl or trioctyl phosphate) , as extreme pressure and anti-wear additive, and antioxidants (such as hindered phenols and amines.
In a continuous rolling operation, the average droplet or particle size of the oil phase is either periodically or continuously checked. The oil droplet size distribution is then restored to a value within the range of optimum. This is achieved by either varying the degree of homogenizing or varying the blending ratios of emulsion components.
It is also possible to develop calibration tables whereby droplets of predetermined sizes may be obtained based on the proportions of emulsion components combined to form the emulsion or the mixing or homogenizing conditions used. In this manner, when a different alloy is passed through a rolling mill, the droplet size can immediately be adjusted to the optimum range for that particular alloy. The emulsion oil droplet size distribution can be monitored either on-line or off-line using either optical or conductivity-based measurement techniques. A method for assessing the average particle or droplet size of an emulsion oil is described in U.S. Patent No. 3,783,664.
The process of this invention can be used not only in hot rolling mills, but also in cold rolling, rolling of thin strip and for processing of other metals by rolling. Best Modes for Carrying Out the Invention Example 1
Tests were conducted on a laboratory hot rolling mill for rolling aluminum. The aluminum stock that was used was AAllOO.
Emulsions were prepared of large droplet size (loose emulsions) and small droplet size (tight emulsion) . The loose emulsion had a medium droplet size of 5.5 microns and the tight emulsion had a median droplet size of 1.9 microns .
The loose "HFR-2" emulsion was prepared comprising a 5% dilution in deionized water of the following composition (w/w %) :
40% Quakerol® 740E (neopentyl glycol dioleate ester)
1.5% Igepal® CO-430 (nonionic alkylphenol ethoxylate surfactant - low HLB*) 1.5% Igepal CO-630 (nonionic alkylphenol ethoxylate surfactant - higher HLB*)
1.5% Irganox® L135 (3 , 5-di- tert-butyl-4- hydroxyhydrocinnamic acid, C7-9 branched alkyl esters)
55.5% of mixture of 40% (w/w) Sunpar® 2280 and 60% (w/w) Sunpar LW150 (both are petroleum hydrocarbon oils)
*HLB stands for "Hydrophile-Lipophile Balance"
A tight emulsion was prepared in the same manner as above except that each emulisifier, e.g. Igepal CO, was
present at a level of 3%, thus reducing the hydrocarbon oil mix to 52.5% of the total.
The mill was operated at three different rolling speeds (20, 60 and 100 RPM) , two slab entry temperatures (300 and 500°C) and two reductions (20 and 50%) . The emulsion were applied to the aluminum alloy before the rolls and the "forward slip" results obtained are shown in Table 1 below:
TABLE 1
Speed [RPM] Forward Slip [%] high reduction [50%] low reduction [20%]
Tight Emulsion Loose Emulsion Tight Emulsion Loose Emulsion
20 2.0 1.0 4.0 4.0
60 1.5 0 1.5 3.0
100 -3.0 -7.0 0.0 3 . 0
Forward slip occurs during rolling, and reflects the speed difference between the roll and sheet. It is a significant process phenomenon because it arises as an effect of friction. High forward slip usually indicates high friction while low forward slip indicates low friction. Thus, "positive forward slip" means that the strip speed is faster than the roll speed i.e. caused by the metal exiting the roll bite at a faster rate than it enters due to the reduction in thickness occurring during rolling; "negative forward slip" means that the strip speed is slower than the roll speed i.e. caused by skidding between the rolls and strip. The results indicate that, at a 300°C slab entry temperature, there is a relationship between friction and emulsion oil droplet size. During
8 rolling at 50% reduction, forward slip was significantly lower with the loose than with the tight emulsions. On the other hand, at 20% reduction the trend was opposite.
The function of a rolling emulsion is to lower the forward slip to an acceptable level. While this is partially alloy dependant, it is often around 5% positive slip. Control of forward slip by mechanically adjusting oil droplet size distribution according to the invention provides significant practical benefits, because excessively high forward slip can lead to surface quality defects on the slab, while negative forward slip can prevent rolling and introduce other types of surface defects due to skidding the rolls on the strip. Thus, the invention can be used to adjust the forward slip ultimately to the optimum level for each alloy being rolled.
Claims
1. In a process for rolling aluminum products in which the aluminum is passed between rolls of a rolling mill and roll bite friction is controlled by applying to the aluminum being rolled a lubricant comprising an oil-in- water emulsion having a specific oil droplet size, the improvement which comprises adjusting the oil droplet size of the emulsion to optimize the roll bite friction requirements of different sheet aluminum product or rolling mills or to compensate for emulsion degradation due to aging, the droplet size being adjusted by either (a) blending emulsion components from multi-tank storage or (b) passing a large droplet size emulsion through a homogenizer or mixer to obtain droplets of a desired size.
2. A process according to claim 1 wherein the blending of emulsion components or homogenizing to form the desired droplet size is carried out immediately before a roll bite.
3. A process according to claim 2 wherein the homogenizing is carried out in an in-line homogenizer.
4. A process according to claim 2 wherein the rolling operation is carried out in a hot rolling mill.
5. A process according to claim 2 wherein the rolling operation is carried out in a cold rolling mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU31338/99A AU3133899A (en) | 1998-04-03 | 1999-04-01 | Process for adjusting lubricant oil droplet size in an aluminum rolling mill |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US8072398P | 1998-04-03 | 1998-04-03 | |
| US60/080,723 | 1998-04-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999051369A1 true WO1999051369A1 (en) | 1999-10-14 |
Family
ID=22159198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CA1999/000294 WO1999051369A1 (en) | 1998-04-03 | 1999-04-01 | Process for adjusting lubricant oil droplet size in an aluminum rolling mill |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU3133899A (en) |
| WO (1) | WO1999051369A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2846011A1 (en) * | 2002-10-18 | 2004-04-23 | Corus Aluminium Nv | Metal blank for forming operations, notably of aluminum alloy, with variable coefficient of friction over its surface, suitable for motor vehicle coachwork |
| US7622021B1 (en) * | 1999-02-13 | 2009-11-24 | Cognis Ip Management Gmbh | Process for paper substrates using an emulsion and products produced thereby |
| JP2018075584A (en) * | 2016-11-07 | 2018-05-17 | 新日鐵住金株式会社 | Rolling oil supply method, rolling oil supply system, and rolling line |
| WO2019243472A1 (en) * | 2018-06-19 | 2019-12-26 | Sms Group Gmbh | Method and roll stand for rolling a material to be rolled |
| IT201900005442A1 (en) * | 2019-04-09 | 2020-10-09 | Danieli Off Mecc | COLD ROLLING PROCESS OF AN ALUMINUM PRODUCT AND RELATED COLD ROLLING PLANT |
| RU2774690C1 (en) * | 2019-04-09 | 2022-06-21 | ДАНИЕЛИ И КО ОФФИЧИНЕ МЕККАНИКЕ С.п.А. | Method for cold rolling aluminum product and associated cold rolling plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3783664A (en) * | 1971-01-13 | 1974-01-08 | Alcan Res & Dev | Process for control of lubricants in an aluminium rolling mill |
| JPS5689316A (en) * | 1979-12-24 | 1981-07-20 | Kawasaki Steel Corp | Emulsion supplying method of rolling mill |
| JPS5739023A (en) * | 1980-08-20 | 1982-03-04 | Nippon Steel Corp | Feeding method for rolling mill oil in cold rolling |
| JPS62254907A (en) * | 1986-04-28 | 1987-11-06 | Sumitomo Light Metal Ind Ltd | Hot rolling method for aluminum |
| US5090225A (en) * | 1988-10-18 | 1992-02-25 | Sms Schloemann-Siemag Aktiengesellschaft | Method for cooling and lubricating chiplessly shaped metals |
| JPH04300012A (en) * | 1991-03-27 | 1992-10-23 | Nippon Steel Corp | Method for controlling surface gloss of metal strip |
| JPH06170409A (en) * | 1992-12-01 | 1994-06-21 | Sumitomo Light Metal Ind Ltd | Method for cold-rolling aluminum |
-
1999
- 1999-04-01 AU AU31338/99A patent/AU3133899A/en not_active Abandoned
- 1999-04-01 WO PCT/CA1999/000294 patent/WO1999051369A1/en active Application Filing
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| US3783664A (en) * | 1971-01-13 | 1974-01-08 | Alcan Res & Dev | Process for control of lubricants in an aluminium rolling mill |
| JPS5689316A (en) * | 1979-12-24 | 1981-07-20 | Kawasaki Steel Corp | Emulsion supplying method of rolling mill |
| JPS5739023A (en) * | 1980-08-20 | 1982-03-04 | Nippon Steel Corp | Feeding method for rolling mill oil in cold rolling |
| JPS62254907A (en) * | 1986-04-28 | 1987-11-06 | Sumitomo Light Metal Ind Ltd | Hot rolling method for aluminum |
| US5090225A (en) * | 1988-10-18 | 1992-02-25 | Sms Schloemann-Siemag Aktiengesellschaft | Method for cooling and lubricating chiplessly shaped metals |
| JPH04300012A (en) * | 1991-03-27 | 1992-10-23 | Nippon Steel Corp | Method for controlling surface gloss of metal strip |
| JPH06170409A (en) * | 1992-12-01 | 1994-06-21 | Sumitomo Light Metal Ind Ltd | Method for cold-rolling aluminum |
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| Title |
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| PATENT ABSTRACTS OF JAPAN vol. 005, no. 162 (M - 092) 17 October 1981 (1981-10-17) * |
| PATENT ABSTRACTS OF JAPAN vol. 006, no. 109 (M - 137) 19 June 1982 (1982-06-19) * |
| PATENT ABSTRACTS OF JAPAN vol. 012, no. 131 (M - 688) 22 April 1988 (1988-04-22) * |
| PATENT ABSTRACTS OF JAPAN vol. 017, no. 114 (M - 1377) 9 March 1993 (1993-03-09) * |
| PATENT ABSTRACTS OF JAPAN vol. 018, no. 498 (M - 1675) 19 September 1994 (1994-09-19) * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7622021B1 (en) * | 1999-02-13 | 2009-11-24 | Cognis Ip Management Gmbh | Process for paper substrates using an emulsion and products produced thereby |
| FR2846011A1 (en) * | 2002-10-18 | 2004-04-23 | Corus Aluminium Nv | Metal blank for forming operations, notably of aluminum alloy, with variable coefficient of friction over its surface, suitable for motor vehicle coachwork |
| JP2018075584A (en) * | 2016-11-07 | 2018-05-17 | 新日鐵住金株式会社 | Rolling oil supply method, rolling oil supply system, and rolling line |
| WO2019243472A1 (en) * | 2018-06-19 | 2019-12-26 | Sms Group Gmbh | Method and roll stand for rolling a material to be rolled |
| IT201900005442A1 (en) * | 2019-04-09 | 2020-10-09 | Danieli Off Mecc | COLD ROLLING PROCESS OF AN ALUMINUM PRODUCT AND RELATED COLD ROLLING PLANT |
| WO2020208535A1 (en) * | 2019-04-09 | 2020-10-15 | Danieli & C. Officine Meccaniche S.P.A. | A process for cold rolling an aluminum product and related cold rolling plant |
| CN113646103A (en) * | 2019-04-09 | 2021-11-12 | 丹尼尔和科菲森梅克尼齐有限公司 | Process for cold rolling aluminium products and relative cold rolling installation |
| RU2774690C1 (en) * | 2019-04-09 | 2022-06-21 | ДАНИЕЛИ И КО ОФФИЧИНЕ МЕККАНИКЕ С.п.А. | Method for cold rolling aluminum product and associated cold rolling plant |
| US11779980B2 (en) | 2019-04-09 | 2023-10-10 | Danieli & C. Officine Meccaniche S.P.A. | Process for cold rolling an aluminum product and related cold rolling plant |
Also Published As
| Publication number | Publication date |
|---|---|
| AU3133899A (en) | 1999-10-25 |
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