JP3348825B2 - Wet temper rolling method and equipment row for cold rolled metal strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for wet-temper rolling a cold-rolled metal strip.

[0002]

2. Description of the Related Art Temper rolling of a cold-rolled metal strip is performed for the purpose of improving the shape of the metal strip after cold rolling or continuous annealing, and giving desired surface roughness and mechanical properties. There, metal powder generated during the cold rolling in the previous process and the temper rolling in the current process adheres to the work roll and intermediate roll (back-up roll) of the temper rolling mill, causing surface defects such as dull baldness and roll marks. In order to prevent
Generally, so-called wet temper rolling in which temper rolling is performed while supplying a temper liquid and performing roll cleaning is performed.

Conventionally, a 3-10% aqueous solution of an organic amine or an organic acid, which is effective in preventing rusting from temper rolling to rust-preventive oiling, has been used as a heat treatment liquid. As shown in FIG. 3 , the upper and lower work rolls 3, 3 or metal strips (cold-rolled metal strips) S on the upper and lower surfaces of the liquid supply nozzles 1, 1 disposed on the upper and lower sides of the temper mill 11 A method of spraying a large amount of the refining liquids 2, 2 is used. In addition, on the exit side of the temper rolling mill 11, the upper and lower surfaces of the metal strip are drained by air injection from air wipers 4 and 4 provided above and below in order to keep moisture of the temper liquid as little as possible.

[0004]

In wet pass tempering, a large amount of temper is used, but it is desired to reduce the supply of temper in order to reduce costs. On the other hand, the continuous annealing line for the thin steel strip is provided with an automatic surface inspection device for monitoring the metal strip subjected to wet temper rolling after continuous annealing and automatically detecting the surface flaw thereof. This device emits light to a surface to be inspected by a metal strip and recognizes the presence or absence of a flaw from the form of the reflected light.

However, in the metal strip surface after wet temper rolling, sometimes refining liquid remains in a thin mottled 8 or black dropwise pattern 9 as shown in FIG. Such a pattern is likely to be mistaken for a flaw because its reflected light form is similar to a flaw, due to its surface gloss, form of the residue, contour, and the like. There is a problem that loss occurs and cost increases. In the investigation by the present inventors so far, about 40% of the surface patterns determined to be surface flaws were those in which the above-mentioned liquid residue was erroneously recognized.

[0006] It is considered that if the supply amount of the refining liquid is reduced, the cost can be reduced, and at the same time, the residual liquid is reduced and the false recognition rate is also reduced. However, in this case, when the temper rolling is performed at a high speed, the probability of occurrence of liquid film breakage increases, and there is a problem that the surface quality and shape of the metal strip are often poor. As a countermeasure to such liquid film breakage does not occur when reducing the supply amount of refining liquid, as shown in FIG. 5, tempered fluid ejection supply destination temper rolling machine 11 and below the entry side of the 2, 2 Of the metal band S before and after entering the deflector rolls 5 and 5 and trying to uniformly spread the conditioning liquids 2 and 2 on the surface by the deflector rolls 5 and 5, The occurrence of poor surface quality and poor shape of the band was reduced.

However, since the organic amine and / or organic acid (collectively referred to as an organic component) in the liquid still leaves a pattern similar to the flaw on the surface of the metal strip after draining, misidentification of the surface flaw is completely eliminated. Could not be eliminated. In view of the above-mentioned problems of the prior art, the present invention provides a method and a series of equipment for cold-rolling a cold-rolled metal strip which can reduce the cost of a refining solution and which does not cause a liquid residue that can be recognized as a flaw after rolling. The purpose is to:

[0008]

SUMMARY OF THE INVENTION According to a first aspect of the present invention, a cold-rolled metal strip is temper-rolled while supplying a tempering liquid, and the upper and lower surfaces of the metal strip are drained. in the wet temper rolling method of cold rolling metal strip to rust coated oil, water was fed as the refining solution, the rust oiled before after the liquid cutting, before
Dry the metal strip and then inspect the surface of the dried metal strip.
A wet temper rolling method of cold rolling metal strip, which comprises carrying out.

[0009] The second invention is the first invention, wherein
Performs temper rolling at the delivery side of the continuous annealing equipment, the refining
Supply water as a liquid, and after the drainage and before rust-preventive oiling,
Dry the metal strip and then inspect the surface of the dried metal strip.
Cormorant be the gist. A third aspect of the present invention is to provide a conditioning liquid on the inlet side.
A liquid supply device for supplying water, and a temper rolling mill that includes a drainer on the outlet side and performs wet temper rolling of the cold-rolled metal strip,
Drying equipment for drying cold-rolled metal strips and automatic surface inspection equipment
And a lubricating apparatus for applying rust-preventive coating oil to the cold-rolled metal strip in this order .

In a fourth aspect, the present invention provides the third aspect of the present invention,
Temper rolling mill , the drying device, and the automatic surface inspection device
When, with the oiling device is summarized in that the are arranged in a delivery side of the continuous annealing equipment in this order.

[0011]

According to the first aspect of the present invention, a cold-rolled metal strip is temper-rolled while supplying a tempering liquid, and the upper and lower surfaces of the metal strip are drained. In a wet temper rolling method for cold-rolled metal strips to be lubricated ,
And with supplying water, before after draining rust oiling, metal
Dry the strip and then inspect the surface of the dried metal strip.
As a result, the refining liquid cost is significantly reduced to the level of water cost, and at the same time, there is no organic component even if liquid remains on the upper and lower surfaces of the metal strip after draining, so there is no organic component, so a reflection form similar to a flaw Since no pattern remains, it is not erroneously recognized as a flaw. In addition, since water can be used as the refining liquid , the cost can be afforded and the roll cleaning ability can be further increased, so that defects such as roll marks can be further reduced.

From the viewpoint of preventing the occurrence of false recognition of flaws,
Pure water is preferred as the feed water for temper rolling, and pure water is
More preferably, water containing 0.5% or less of an organic component is used.
If the organic component is not included
Water up to 0.5% may be applied.SoofLiquid
(Water) Dry the cold rolled metal strip after cutting and before rust-preventive oiling
Even if you do not rely on the rust-preventive power of organic components,
Rust between rust and anti-rust coating oil can be sufficiently suppressed
You. To perform this drying, heat the upper and lower surfaces of the metal strip to 60 ° C or more.
do it.

According to a second aspect of the present invention, in the first aspect of the present invention, the temper rolling is performed on the discharge side of the continuous annealing equipment and the temper rolling is performed.
Supply water as a liquid, and after draining, before rust prevention
Was Drying, followed because it was decided to perform surface inspection of the dried metal strip, it is possible to continue rolling flaw false efficiently without wet temper the metal strip after continuous annealing. The third present invention is a row of cold-rolled metal strip temper rolling equipment suitable for carrying out the first present invention. As shown in FIG. 1, a liquid supply device (liquid supply nozzle) 1 is provided on the inlet side. , A temper rolling mill 11 equipped with a draining device 4 on the outlet side for wet temper rolling of a metal strip (cold rolled metal strip) S, a drying device (dryer) 6 for drying the metal strip S, and an automatic surface inspection An apparatus 10 and an oiling apparatus 7 for applying rustproof oil to the metal strip S are arranged in this order.

From the liquid supply nozzle 1, water 2A is jetted. Although the liquid removing device 4 in FIG. 1 is configured by an air wiper, it may be configured by a pinch roll. Drying device 6
Any type, such as an electric heating type, a radiant tube type, and a steam heat exchange type, can be applied as long as it has a capability of raising the surface temperature of the metal strip S to 60 ° C. or more . Function of automatic surface inspection apparatus 10 is as described above. Thereby, the third invention can be efficiently implemented.

[0015] The fourth invention is the second temper rolling facilities column suitable cold rolling metal strip in the practice of the present invention, as shown in FIG. 2, a temper rolling machine 11, drying device 6 and automatic surface inspection
The inspection device 10 and the oiling device 7 are arranged on the exit side of the continuous annealing equipment 12 in this order . According to this, since temper rolling can be performed without winding the metal strip S after continuous annealing, productivity is further increased.

[0016]

EXAMPLES cold rolled thin steel strip continuous annealing have been thickness 0.3 to 2.9 mm, the step of rolling the wet temper at 0.5 to 2.0% temper rolling elongation, using the equipment column of FIG. 2, tone Using the purified water in place of the bulk liquid, using a steam heat exchange type dryer capable of raising the surface temperature of a steel strip traveling at a maximum speed of 500 mpm to 60 ° C. or higher as a drying device, the temper rolling method of the present invention. As a result, erroneous flaw determination of the automatic surface inspection device based on the residual liquid pattern after draining was performed.
Has disappeared.

Further, the refining liquid cost is remarkably reduced to the level of the water cost, and there is no rust between the drainage and the anti-rust coating.

[0018]

As described above, according to the present invention, the refining liquid cost in wet temper rolling is remarkably reduced, and the remaining liquid pattern is erroneously recognized as a flaw in the surface defect inspection of the cold-rolled metal strip after the temper rolling. It has an excellent effect that no longer occurs.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of a facility row according to a third invention.

FIG. 2 is a schematic diagram showing an example of a facility row according to a fourth invention.

FIG. 3 is a schematic view showing a conventional example of a wet passivation rolling method .

FIG. 4 is a schematic view showing a liquid remaining pattern which is easily mistaken for a surface flaw .

FIG. 5 is a schematic diagram showing another conventional example of a wet passivation rolling method .

[Explanation of symbols]

 S Metal band 1 Liquid supply nozzle (liquid supply device) 2 Conditioning liquid 2A Water 3 Work roll 4 Air wiper (liquid removal device) 5 Deflector roll 6 Drying device (Dryer) 7 Oiling device 8 Thin spot pattern 9 Black dripping pattern 10 Automatic surface inspection equipment 11 Temper rolling mill 12 Continuous annealing equipment

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Okamoto remodeling 1-chome, Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama Pref. Kawasaki Steel Corporation Mizushima Works (56) References JP-A-2-30305 (JP, A JP-A-6-15308 (JP, A) JP-A-7-16622 (JP, A) JP-A-55-91932 (JP, A) JP-A-59-78702 (JP, A) 45207 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 1/00-11/00 B21B 45/00-45/02

Claims (4)

(57) [Claims] 1. A cold-rolled metal strip which temper-rolls a cold-rolled metal strip while supplying a tempering liquid, performs liquid drainage on upper and lower surfaces of the metal strip, and applies rust-proof oil to the metal strip. of the wet temper rolling method, water is supplied as the refining solution, the liquid switch
After rusting and before rust preventive lubrication, the metal strip is dried and then dried.
A wet temper rolling method for a cold-rolled metal strip, characterized by performing a surface inspection of the metal strip that has been rolled. Wherein the row the temper rolling at the delivery side of the continuous annealing equipment
At the same time, water is supplied as the refining liquid, and after the draining,
Before lubrication, the metal strip is dried and then dried
According to claim 1, characterized in that the surface inspection of the genus band
Wet temper rolling method for cold rolled metal strip . 3. A temper rolling mill provided with a liquid supply device for supplying water as a temper liquid on an inlet side and a drainer on an outlet side for wet temper rolling a cold-rolled metal strip, and a cold-rolled metal strip. A cold-rolled metal strip temper rolling characterized by arranging, in this order, a drying device for drying the steel, an automatic surface inspection device, and an oiling device for applying rust-preventive coating oil to the cold-rolled metal strip. Equipment row. 4. The temper rolling mill , the drying device,
4. The refining rolling equipment line for cold-rolled metal strip according to claim 3 , wherein the automatic surface inspection device and the oiling device are arranged in this order on the outlet side of the continuous annealing equipment.