JPH09239403A - Method for cold rolling of metallic material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the reduction of area of cold rolling, and to enhance the appearance of a rolled sheet metal by supplying lubricating oil for rolling from a metallic material inlet side for rolling, and supplying cooling water from the rolled metallic plate outlet side to the surfaces of rolling rolls. SOLUTION: The lubricating oil for rolling is supplied by injecting to metallic material sheet surfaces 1c1 , rear 1c2 and/or the surfaces 2b1 , 2b2 of both rolling rolls as lubricating oil 9a1 , 9a2 for rolling from both upper and lower surface sides of the metallic material sheet 1 for rolling through supply pipes 6a1 and 6a2 . For the lubricating oil for rolling to be used, oil type lubricating oil insoluble to water, which does not essentially contain water, is used. The cooling water is supplied to respective surfaces 2c1 and 2c2 on the (b) side of the rolled metallic sheet 1 of the upper and lower rolling rolls from a tip nozzle through supply pipes 7a1 and 7a2 . As measures for deterioration in gloss property, a wiper 4a1 for preventing the attachment of the cooling water to the surface of the rolled metallic sheet, is installed in a position between the cooling water supply place of the surface 2c1 of the rolling roll and the rolled sheet metal 1b, making the wiper 4a1 come into contact with the rolling roll surface.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cold rolling method for metallic materials. More specifically, it is intended to improve the reduction ratio of cold rolling and prevent nonuniformity of the surface of a rolled metal sheet, and supply a rolling lubricant containing no water on the metal material inlet side. The present invention relates to a method of supplying cooling water to the surface of a rolling roll on the rolled metal plate exit side.

[0002]

2. Description of the Related Art Cold rolled sheets are preferably used for aluminum, its alloys, ordinary steel, stainless steel, zinc, etc. due to their characteristics. Among the factors that affect the efficiency of cold rolling of metallic materials, the reduction rate and the uniformity of the surface of the rolled metal sheet are the most important factors.The former are mainly the number of cold rolling, the production speed, and the physical properties of the product. However, the latter mainly affects the appearance characteristics of the rolled product, and various proposals have been made for improving the rolling reduction and the uniformity of the surface of the rolled metal sheet.

The reduction rate in cold rolling of metal materials naturally depends on the number of times of cold rolling, the speed of rolling, the diameter of the rolling roll, the type of lubricating oil for rolling, and other factors. The limit was ~ 50%. This limit is due to non-uniformity of the thickness, width, etc. of the cold rolled plate due to thermal expansion deformation of the rolled roll due to temperature increase of the rolling roll during cold rolling, and deterioration of mechanical properties of the rolled plate. It is decided by. The nonuniformity of the thickness referred to here includes a drastic decrease in the thickness of the central portion of the cold-rolled sheet, that is, a so-called medium elongation phenomenon.

On the other hand, the uniformity of the surface of the rolled metal sheet in the cold rolling process is judged by the presence or absence of a white streak or irregular pattern on the surface of the rolled sheet, a matte state, a striped matte state, etc. It is pointed out that, in addition to being influenced by the type of the lubricating oil for rolling, particularly in aluminum or its alloy, it is easily damaged by the water component in the lubricating oil for rolling, for example, the water emulsion or the water solution of the lubricating oil for rolling. ing. Regarding the above-mentioned rolling lubricating oil, the research is in the state of providing a considerably excellent one, but with the increase of the rolling reduction, it has been said that it is necessary to cool the rolling rolls, etc. There has been a demand for the appearance of a suitable method for preventing the deterioration of the uniformity of the surface of a rolled metal sheet under use.

[0005]

Therefore, the present invention solves the conventional problems caused by the cooling water for rolling rolls during cold rolling of metal materials, and improves the rolling reduction and the uniformity of the surface of the rolled metal sheet. To find a way to do it.

[0006]

As a result of intensive studies for solving the above-mentioned problems, the present inventor found that by completely separating the supply positions of the lubricating oil for rolling and the cooling water, and further after supplying both of them. The inventors have found that the problem can be solved by preventing the mutual mixing of the two as much as possible, and completed the present invention. The gist of the present invention is as follows.

(1) In a method of cold rolling a metal material using a rolling roll, a lubricating oil containing substantially no water is introduced from the metal material inlet side onto the surface of the rolling roll and / or the surface of the metal material. A method of cold rolling a metal material, characterized in that, while being supplied, cooling water is supplied to the surface of a rolling roll from the exit side of the obtained rolled metal plate. (2) The method of cold rolling a metal material according to the above 1, wherein the cooling water is supplied under cold rolling conditions in which the surface temperature of the rolling roll reaches at least the volume change temperature of the rolling roll. (Third) The cooling of the metallic material according to the first aspect, wherein the lubricating oil for rolling which does not substantially contain water is a mixture of a linear α-olefin having 6 to 40 carbon atoms and a mineral oil as a base oil. Hot rolling method. (4) The method of cold rolling a metal material according to the above 1, wherein a backup roll is attached to each rolling roll, and a lubricating oil removing wiper for rolling is attached to the surface of each backup roll. (Fifth) The cold rolling method for a metal material according to the first aspect, which is performed by attaching a cooling water drain wiper to each surface of the rolling roll on the delivery side of the rolled metal sheet. (Sixth) The mixed liquid of the rolling lubricant and the cooling water discharged from the metal material, the rolling roll or the backup roll is collected and separated to be re-used as the rolling lubricant and the cooling water containing substantially no water. The method for cold rolling a metal material according to any one of the first to fifth aspects, which is used.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention will be described below with reference to the drawings. First, the outline of each drawing will be described. The same reference numerals are used for the common parts in the drawings.
FIG. 1 is a side view of an example of a rolling process state of a metal material by the method of the most preferable embodiment in the cold rolling method according to the present invention. The rolling lubricating oil and cooling water used for the process A flow chart of usage is also shown. FIG. 2 is a side view showing a state where the cooling water is sprayed and supplied to the surface of the rolling roll after the cold rolling, and only the rolling roll on the upper surface side of the metal plate is shown.

As shown in FIG. 1, when a pair of upper and lower cold rolling rolls 2a ₁ and 2a ₂ are rotated in the direction of the arrow, the metal material plate 1 for rolling that passes between the two rolling rolls is passed.
Is rolled from the rolling metal material plate 1a to the rolled metal sheet 1b. The reduction rate referred to in the present invention is the thickness change rate itself. The lubricating oil for rolling passes through the supply pipes 6a ₁ and 6a ₂ from the upper and lower surfaces of the rolling metal material plate 1 to the front surface 1c _{1 of the} metal material plate, the back surface 1c ₂ and / or the front surface 2b _{1 of} both rolling rolls. The lubricating oil for rolling 9a ₁ and 9a ₂ is injected and supplied to 2b ₂ .

The change in shape of the metal material plate for rolling due to the rolling process is more gradual as the diameter of the rolling roll is larger. Therefore, if the diameter of the rolling roll is originally made as large as possible. Good, but it is naturally limited in terms of manufacturability, workability, and economy. If it becomes thin, naturally, it tends to bend during rolling, and a rolled metal thin plate having a uniform thickness over the entire width cannot be obtained. Therefore, usually in order to prevent the bending of, the upper and lower backup rolls 3a ₁ and 3a ₂ of the rolling roll, yet are arranged on the central axis of each roll in accordance with the vertical line (X-X).

Of the lubricating oil for rolling, the one supplied to the upper surface side is the backup roll surface 3 on the metal material entering side.
deposited also scattered in b _1, the surface 3c ₁ of rolled metal plate delivery side
Therefore, it is preferable to install the oil removing wiper 5a ₁ on the surface 3b ₁ because it may also be contaminated. On the other hand, the lubricating oil for rolling 9a ₂ supplied to the lower surface side may partially drop from the rolling roll 2a ₂ and may be scattered on the surface 3b ₂ of the backup roll 3a _{2 on} the metal material inlet side as described above. Since there is also a possibility of contaminating the surface 3c ₂ on the side of the rolled metal sheet, it is preferable to install an oil removing wiper 5a ₂ on the surface 3b ₂ . In the drawings, the wiper is used in such a manner that a plate-shaped wiper is brought into contact with the backup roll, but a plate-shaped wiper having high rigidity is considerably high if it is attempted to make contact with the backup roll without a gap. Since the original wiping effect does not appear unless it is used under pressure, the roll surface may be damaged, and a plate-like body made of felt or felt-coated or rubber or rubber-coated is more preferable. Most preferred is an air wiper that blows air onto the backup roll.

The rolling lubricating oil used here is an oil type water-insoluble lubricating oil which contains substantially no water. The water content depends on the type of the lubricating oil, but if the content is less than 1% by weight, the effect is likely to occur. Specific examples of oil-type water-insoluble lubricating oils include mineral oils, synthetic oils (α-olefins, monoesters, diesters, alcohols, etc.) and mixtures thereof as a base oil. It is preferable to use a mixture with mineral oil as a base oil because the limit of the rolling reduction is improved. Α- used here
Most preferably, the olefin is a straight chain having 6 to 40 carbon atoms. Further, the mixing ratio of mineral oil and α-olefin is 20-
95: 5 to 80, more preferably 50 to 95: 5 to 50 (weight%), and the result that the rolling reduction can be greatly improved from the conventional 30 to 50% by using the lubricating oil for mixed rolling in this range. Got

The surplus of the rolling lubricating oil 9a ₁ drops from both sides of the rolling metal material plate 1a, and the surplus of the rolling lubricating oil 9a ₂ is the surface 2b of the rolling roll.
₂ or from the oil removing wiper 5a ₂ drops as a used liquid 14 together with cooling water described later, is received by a container 15, and is accumulated in an oil / water separation tank 8 through a pipe 16 to form an oil layer 9
And a water layer 10 are separated. Mixed layer 11 at the boundary between both layers
Enters the oil / water separator 12 installed as necessary, and the separated oil is returned to the oil layer via the pipe 13a,
It is sent to the supply pipes 6a ₁ and 6a ₂ via the pipe 6 and is reused as the lubricating oil for rolling. The separated water is stored in the tank 17 through the pipe 13b, and the water in the water layer 10 and, if necessary, a part of the stored water is passed through the pipe 7 and the surface of the rolling roll on the side of the rolled metal sheet described later. Will be reused as cooling water.

The rolling roll is heated by the heat generated by the cold rolling of the metal, but when it is carried out under the conditions of high pressure reduction rate, high speed rolling, etc., or when it is intended to cold-roll difficult-to-roll metal, For example, the temperature becomes as high as 40 to 150 ° C., which causes deformation of the rolling roll itself, which is not preferable. Examples of the deformation referred to herein include axial expansion of the roll, radial drum-shaped expansion deformation of the roll as a whole, and radial expansion deformation of different locations along the axis. This thermal deformation of the rolling roll appears as it is as a non-uniform rolling action on the rolling metal material thick plate 1a, and a rolled metal thin plate 1b having a uniform thickness cannot be obtained.

The present invention employs, as a measure for preventing the thermal deformation of the rolling roll, a method of separating the supply place of the lubricating oil for rolling and the supply place of the cooling water. That is, a means for supplying only the lubricating oil for rolling from the inlet side of the metal material for rolling 1 and supplying only cooling water to the surface of the rolling roll on the outlet side of the metal plate after rolling is adopted. Each surface 2c _{1 of the} rolling rolls 2a ₁ and 2a _2
2 and 2c ₂ have a higher surface temperature in a portion closer to the rolled metal sheet, and heat release and heat storage phenomena can be seen with increasing distance from the sheet. Therefore, it is preferable that the cooling water is supplied closer to the rolled metal sheet.

The cooling water is supplied by the supply pipes 7a ₁ and 7a.
After passing through a ₂ , it is performed from the tip nozzle to each surface 2c ₁ and 2c _{2 of the} upper and lower rolling rolls on the side of the rolled metal sheet 1b. Water flow 10a _{1 on} the rolling roll on the upper surface of the rolled thin metal plate 1b
When cooling water is supplied as, the cooling water falls on the rolled metal sheet, and in the case of aluminum in particular, stains or
It is not preferable because the surface of the rolled thin metal plate is roughened and the glossiness is deteriorated. As a measure against this, the present invention provides a wiper 4a ₁ for preventing cooling water from adhering to the surface of the rolled metal sheet, a cooling water supply place on the surface 2c ₁ of the rolling roll and the rolled metal sheet 1b.
And is placed in contact with the surface of the rolling roll at a position between and. In this case, it is very effective to use a plurality of wipers. A part of the cooling water is also transferred to the backup roll side with the rotation of the rolling roll, but there is almost no possibility of being transferred to the rolling metal material thick plate side due to the drawing effect between both rolls. However, the mixing of water to such an extent that the performance of the lubricating oil for rolling is not substantially caused.

When cooling water is supplied as a water flow 10a ₂ to the rolling rolls on the lower surface of the rolled thin metal plate 1b, the used water is difficult to be transferred to the rolled metal plate side, and the backup roll 3 is used.
Combined with the throttling effect with a ₂ , the used liquid 14 almost falls from the surface 3c _{2 of the} backup roll into the container 15 and collects in the oil / water separation tank 8 together with the above-mentioned lubricating oil to form a water layer 10. . The cooling water thus separated and recovered or the cooling water recovered from the oil-water interface layer is sent to the supply pipes 7a ₁ and 7a ₂ via the pipe 7 as it is or after being sent to a cooling device (not shown). It is reused as cooling water. As described above, most of the cooling water supplied to the surface 2c ₂ of the rolling roll falls, but in the case of the mode of supply method, for example, running water jet, atomized jet, etc., it collides with or adheres to the lower surface of the rolled thin metal sheet above. However, since the condition of the lower surface of the rolled thin metal plate is deteriorated, a cooling water adhesion preventing wiper 4a ₂ in contact with a rolling roll is installed between a place where cooling water is supplied and the lower surface of the thin metal plate. Is preferred.

[0018]

【Example】

(Examples 1 and 2; Comparative Examples 1 to 3) Using the method shown in FIG. 1, cold rolling of a metal material was performed under the following conditions under various reduction rates, and the stress " The "rolling force" was measured, and the "surface state" of the rolled metal sheet was observed. (a) Rolling metal material: A3004H14 (Mn-containing aluminum material), 1.5 mm thickness, 70.0 mm width coil (b) Rolling machine: Rolling roll diameter 135 mm, Backup roll diameter 200 mm (c) Rolling conditions: (1) Rolling linear velocity (linear velocity of metal material for rolling): 150
m / min (2) Reduction ratio: Various reduction ratios shown in Table 1 were selected. (3) Cooling water supply method: Cooling water is used in the examples. Width 70m
Three cooling water nozzles were installed symmetrically on the upper and lower side surfaces of the rolled metal thin plate of m, and at the center and both sides thereof at intervals of 20 mm, and cooling water was supplied to the rolling rolls at the positions. 10 liters / minute from the central nozzle,
It was 2 liters / minute from each nozzle on both sides. The comparative example does not use cooling water. However, glossiness (gloss value)
Cooling water is used during measurement. (4) Wiper: Air wipers were installed at the positions of the wipers 5a ₁ and 5a _{2 in} FIG. 1, respectively. Air pressure is 6
It was performed at kg / cm ² . (d) Sample oil 1: 40 ° C, 3.6 mm ² / s mineral oil (91 wt
%) Myristyl alcohol (8 wt%) Butyl stearate (1 wt%) Sample oil 2: 40 ° C, 3.6 mm ² / s Mineral oil (64 wt%) C ₁₈ n-olefin (30 wt%) Myristyl alcohol (5 wt%) Butyl Stearate (1wt%) Sample oil 3: 40 ° C, 3.6mm ² / s Mineral oil (50wt%) Myristyl alcohol (40wt%) Emulsifier (10wt%) Water emulsion (5wt%) (e) Result is 1st Shown in the table.

[0019]

[Table 1]

[0020]

As in the present invention, during cold rolling,
Of the surface of the rolling roll, only the lubricating oil for rolling, which contains substantially no water, is supplied to the inlet side of the rolling metal material, and cooling water is supplied to the surface of the rolled metal plate outlet side. As a result, we succeeded in improving the reduction ratio of cold rolling and the appearance of the rolled metal sheet.

[Brief description of drawings]

FIG. 1 shows a side view of an example of a metal rolling processing state of a most preferable embodiment according to the present invention.

FIG. 2 is a side view showing a state of supplying cooling water to the surface of a rolling roll.

[Explanation of symbols]

1 ・ ・ ・ ・ ・ ・ Metal material for rolling 1a ・ ・ ・ ・ Metal plate for rolling thick plate 1b ・ ・ ・ ・ Rolled thin metal plate 1c ₁・ ・ ・ ・ Metal material for rolling Thick plate front side 1c ₂ ··· Metal material for rolling Back side 2a ₁ ··· Top side rolling roll 2a ₂ ··· Bottom side rolling roll 2b ₁ ··· Surface of metal material entry side of upper surface rolling roll 2b ₂ ···· Surface of metal material entry of lower surface rolling roll 2c ₁ ···· Surface of thin metal plate of upper surface rolling roll 2c ₂ ··· .... lower surface side rolling roll of sheet metal exit surface 3a _1, 3a ₂ ... backup roll 3b _1, 3b ₂ of ... backup roll metal material entry side surfaces 3c _1, 3c ₂ ... backup roll Surface of the metal thin plate on the output side 4a ₁ , 4a ₂ ... Wiper 5a ₁ , 5a ₂ for preventing adhesion of cooling water ... Oil drain Ri wiper 6a ₁ , 6a ₂ ... Lubricating oil supply pipe for rolling 7 ... Pipe 7a ₁ , 7a ₂ ... Cooling water supply pipe 8 ... 9 ... Oil layer 9a ₁ and 9a ₂ Rolling lubricating oil 10 ... Water layer 10a ₁ and 10a ₂ Water flow 11 ... Oil-water mixed layer 12 ... ・ Oil / water separator 13a, 13b ・ ・ Pipe 14 ・ ・ ・ ・ ・ ・ Used liquid 15 ・ ・ ・ ・ ・ ・ ・ Container 16 ・ ・ ・ ・ ・ ・ Pipe 17 ・ ・ ・····tank

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B21B 37/32 B21B 37/00 BBN 45/02 310 116S

Claims (6)

[Claims] 1. A method for cold rolling a metal material using a rolling roll, wherein a lubricating oil for rolling which does not substantially contain water is supplied from the metal material inlet side to the surface of the rolling roll and / or the surface of the metal material. Meanwhile, a method for cold rolling a metal material, characterized in that cooling water is supplied to the surface of a rolling roll from the obtained rolled metal plate exit side. 2. The method for cold rolling a metal material according to claim 1, wherein the cooling water is supplied under cold rolling conditions in which the surface temperature of the rolling roll reaches at least the volume change temperature of the rolling roll. 3. A metal material according to claim 1, wherein the lubricating oil for rolling which does not substantially contain water is based on a mixture of a linear α-olefin having 6 to 40 carbon atoms and a mineral oil. Cold rolling method. 4. The method of cold rolling a metal material according to claim 1, wherein each rolling roll is provided with a backup roll, and each backup roll surface is provided with a lubricating oil removing wiper for rolling. 5. The method of cold rolling a metal material according to claim 1, wherein cooling water draining wipers are attached to each surface of the rolling roll on the delivery side of the rolled metal sheet. 6. A mixed liquid of a lubricating oil for rolling and cooling water discharged from a metal material, a rolling roll or a backup roll is collected and separated to obtain a lubricating oil for rolling and cooling water containing substantially no water. The method for cold rolling a metal material according to any one of claims 1 to 5, which is reused.