JPH01309705A - Continuous cold rolling equipment - Google Patents

Abstract

PURPOSE:To prevent the dilution of a high-density rolling mill lubricant by roll cooling water and to prevent the degradation of lubricity by disposing nozzles for injecting the high-concn. rolling mill lubricant to the inlet side of a rolling mill and disposing jacket type coolers oppositely to the outer peripheral faces of rolling rolls to the outlet side of the rolling mill. CONSTITUTION:The pressurized cooling water sent to a water feed pipe 15 passes a pipe body 12 and is sent to a water feed header 20 and is further projected from slit nozzles 20a of the water feed header 20 so as to be forcibly passed in cooling water passages 19. This water enters the inside of a drain header 21 from a drain port 21a and is drained through a pipe body 13 and a drain pipe 16. The cooling water of the roll 2a is supplied while the water forms a water film with the outside peripheral face of the roll 2a in the hermetically sealed jacket type roll cooler 5 and, therefore, the roll cooling power is extremely high and the leakage of the cooling water from sealing parts 6a, 6b is obviated. The dilution of the high-concn. rolling mill lubricant by the cooling water is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to equipment that can advantageously perform lubrication and cooling during continuous cold rolling of steel strip.

<Prior art> First of all, lubrication and cooling in continuous cold rolling of steel strip are
As shown in Fig. 2, in order to improve the lubricity between the steel strip 1 and the work roll 2, there is a header 3 installed on the entrance side of the stand that injects water-soluble oil onto the steel strip 1, and a header 3 for cooling the work roll 2. This is performed by a header 4 provided on the outlet side of the stand that injects water-soluble oil onto the work rolls 2.

However, in cold rolling using water-soluble oil, especially in rolling special steels such as stainless steel, surface gloss cannot be obtained after rolling. A method is used in which oil (straight oil) is injected into the belt. However, although this method has good lubricity, it has poor roll cooling ability (particularly in the latter stand, the high speeds tend to cause the oil film to break between the surface of the work roll 2 and the steel strip 1 (and heat). There was a problem that a burn-in phenomenon called streak occurred.

As a countermeasure against this problem, a method has been proposed in which roll cooling is performed using water with high cooling capacity, but the roll cooling water from the previous stand is carried to the next stand on the surface of the steel strip 1, and the highly concentrated rolling oil on the entry side is In order to solve this problem, Japanese Utility Model Application Publication No. 111601/1983 discloses a water drain hole at the rear of each stand. Continuous cold rolling equipment has been proposed in which the cooling water on the steel strip is drained by installing a steel strip.

<Problems to be Solved by the Invention> The draining roll shown in the above-mentioned Japanese Utility Model Application Publication No. 111601/1988 rolls rubber having a low Young's modulus (for example, neoprene) in order to prevent the steel strip from bottoming out. Rolls with a lining on the surface or rolls made of rubber alone are used, but in order to improve the drainage performance with a draining roll made of this material, it is necessary to press the toning band to ensure the crushing margin of the rubber, so the draining roll is The parts corresponding to both ends of the steel strip are locally worn and scraped at an early stage, and a gap is formed between the steel strip and the strip.
There was a drawback that sufficient water could not be drained, and if the process progressed further, there was a risk of an accident in which the rubber peeled off, forcing early replacement.

An object of the present invention is to provide continuous cold rolling equipment that solves the above problems.

<Means for Solving the Problems> The present invention provides a nozzle that injects high-concentration rolling oil to the belt on the entry side of the rolling mill, and a nozzle that injects high-concentration rolling oil to the belt on the exit side of the rolling mill, facing the outer circumferential surface of the rolling roll. Five jacket-type cooling devices are arranged above the belt to prevent cooling water from leaking.

<Function> The roll cooling water that cools the outer peripheral surface of the roll by the jacket type roll cooling device does not leak onto the steel strip, so high concentration rolling oil is sprayed from the header onto the strip at the entry side of the next stand. is not diluted by roll cooling water,
As a result, the lubricity during continuous cold rolling does not deteriorate, and for example, the surface gloss of the stainless steel strip can be improved. Furthermore, by using water as a refrigerant for cooling the rolls, the cooling performance can be improved.

<Example> An embodiment of the present invention will be described based on FIG.

In the figure, a header 3 that injects high-concentration rolling oil (straight oil) onto the steel strip 1 is installed on the inlet side of the rolling mill, and upper and lower work rolls 2a of the rolling mill are installed on the exit side of the rolling mill. ,2
A jacket-type roll cooling device 5 that uses water as a refrigerant and is configured to prevent cooling water from leaking onto the belt is arranged opposite to the outer circumferential surface of each of the rollers b. Note that in FIG. 1, the roll cooling device disposed on the lower work roll 2b is omitted.

Next, an embodiment of the jacketed roll cooling device 5 will be described in detail.

The jacket type roll cooling device 5 holds the cooling pad 6 by screws 11 provided on the reference beam 10, and seals 6a and 6b provided at the upper and lower edges of the cooling pad 6.
is pressed against the surface of the roll 2a with an appropriate pressure. Further, the cooling pad 6 and the reference beam 1O are connected by an extensible pipe 12.13 such as a bellows, and these pipes 12.13 are connected to a water supply pipe 15, respectively.
and connected to the drain pipe 16. Reference numeral 17 denotes a bolt for attaching the cooling water guide plate 18 to the reference beam 10, and by adjusting the threading of this bolt 17, the cooling water passage 19 is fixed.
The gap between the roll 2a and the cooling water guide plate 18 can be adjusted.

Now, the pressurized cooling water sent to the water supply pipe 15 from the water supply and drainage pipe system (not shown) passes through the pipe body 12 and reaches the water supply header 20.
and further to the slit nozzle 20 of the water supply header 20.
The water is injected from a, forced to pass through the cooling water passage 19, enters the drain header 21 from the drain port 21a, and is drained from there via the pipe body 13 and the drain pipe 16.

In this way, the cooling water for the roll 2a is supplied to the sealed jacket type roll cooling device 5 while forming a water belly between it and the outer peripheral surface of the roll 2a, so that the roll cooling ability is extremely high and the seal 6a Since there is no leakage of cooling water from parts 6b and 6b, water can be completely drained, and the highly concentrated rolling oil spouted from the header 3 on the entrance side of the next stand is not diluted by the cooling water.

Note that the present invention is applicable not only to tandem cold rolling but also to reverse cold rolling and Sendzimir rolling when the strip is continuously rolled.

<Effects of the Invention> As explained above, the present invention improves lubricity during cold rolling because the highly concentrated rolling oil spouted into the rolling strip at the entrance side of the rolling mill is not diluted by roll cooling water. As a result, for example, the surface gloss of stainless steel strips can be improved. In addition, since water, which has a large cooling capacity, is used as the refrigerant for cooling the rolls, instead of water-soluble oil,
Cooling capacity is improved, heat streaks and the like do not occur even when the line speed is increased, and productivity can be improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of continuous cold rolling equipment of the present invention, and FIG. 2 is an explanatory diagram of a lubrication/cooling device in a conventional continuous cold rolling equipment. ]...Tone belt, 2...Work roll, 2a, 2b...Upper and lower work rolls, 3...Header for injecting high concentration rolling oil, 5...Jacket type roll cooling device. Patent applicant: Kawasaki Steel Corporation fit iJ

Claims (1)

[Claims] A nozzle that injects high-concentration rolling oil onto the steel strip is placed on the inlet side of the rolling mill, and a nozzle is placed on the outlet side of the mill to face the outer peripheral surface of the rolling roll to prevent cooling water from leaking onto the steel strip. Continuous cold rolling equipment characterized by being equipped with a jacket type cooling device.