JPH0671329A - Roll wiping device for strip - Google Patents

Abstract

PURPOSE:Not to deteriorate the surface roughness by the wear of a roll even when a steel wiping roll is used and not to cause slip between the roll and a strip. CONSTITUTION:A cold rolling mill of the strip is constituted by providing a roll polishing device 4 pressing a polishing belt 41 in a fixed pressure to the surface of the steel wiping roll 3 arranged directly above and below the mill as the strip 1 is clamped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiping device for wiping and removing fluid such as rolling oil adhering to the strip surface using a wiping roll in a cold rolling mill for strips such as stainless steel strips.

[0002]

2. Description of the Related Art When cold-rolling a strip such as a stainless steel strip, a lubricating oil called rolling oil is supplied to a roll bite portion. Part of this rolling oil adheres to the strip surface and is carried to the outlet side, but if the strip is wound on the reel as it is, side slip of the strip occurs, and this adhered part is not collected in the rolling oil supply system, so rolling This is one of the causes of worsening the oil consumption rate. Therefore, the inlet and outlet sides of the reciprocating rolling mill, the outlet side of the tandem rolling mill, etc., wipe off the cooling water or rolling oil injected to cool the rolling rolls and strips, and remove it from the surface of the strips. Is usually provided.

The most common wiping device is a roll wiping device for wiping by pressing the wiping rolls provided above and below the strip against the strip and rotating the strip at a peripheral speed equal to the traveling speed of the strip. For example, one using a pair of upper and lower rolls as shown in FIG. 4, two upper and one lower as shown in FIG.
Some use book rolls. In FIGS. 4 and 5, 1 is a strip, 2 is rolling oil adhering to the surface of the strip, 3 is a wiping roll, and arrows represent rolling directions.

FIG. 6 shows a concrete example in which the roll wiping device described in Japanese Patent Laid-Open No. 3-405 is installed in a reciprocating multi-stage rolling mill (Sendimia mill), 5 being a rolling mill and 51 being its work rolls. , 52 is a roll bite coolant nozzle, 53 is a strip coolant nozzle, and 54 is a deflector roll. Although not shown in this figure, there are tension reels at both ends. In this example, the coolant (cooling water, or a mixture of cooling water and rolling oil in some cases) is installed in two stages, one for cooling the roll bite part and one for cooling the strip on the outlet side thereof. Also, one is installed between the roll bite coolant nozzle 52 and the strip coolant nozzle 53, one is provided on the exit side of the strip coolant nozzle 53 before the deflector roll 54, and four are provided on both sides.

By the way, as such a wiping roll, a roll made of steel or a non-woven fabric is generally adopted. Since the steel roll comes into contact with the surface of the strip without any gaps, the wiping performance is good, but there is a problem that the surface roughness decreases as it wears and slips between the strip and the strip, resulting in slip flaws. on the other hand,
Non-woven fabric has a rough surface and high elasticity, so slipping with the strip does not occur, but the liquid is impregnated inside the roll, so the wiping performance is poor, and the edges of the strip easily cause flaws on the roll side. .

Since the steel roll and the non-woven fabric roll have advantages and disadvantages as described above, they are properly used depending on the material of the strip being rolled, the required quality, etc., while leaving acceptable problems. It was the actual situation.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above problems and eliminates the deterioration of surface roughness due to wear of rolls, which is a disadvantage of steel rolls, that is, the reduction of friction coefficient, and excellent wiping performance. The purpose of the present invention is to realize a wiping roll which has a roll and prevents slipping.

[0008]

According to the present invention, in a strip cold rolling mill, a pair of upper and lower steel wiping rolls sandwiching the strip are ground with a constant pressing force on the surface of the wiping roll. A roll wiping device for a strip, which is equipped with a roll polishing device for pressing a belt.

[0009]

[Operation] According to the present invention, the surface roughness of the roll is kept at a substantially constant value by pressing the polishing belt against the steel wiping roll rotating in contact with the strip to keep the strip and the wiping roll. It is possible to prevent the occurrence of slipping with the roll, to prevent the occurrence of slip flaws, and to always perform good wiping while maintaining good wiping performance.

FIG. 7 shows an example of the optimum surface roughness of a steel wiping roll. The horizontal axis shows the surface roughness of the wiping roll, the vertical axis shows the rolling speed, ● indicates slip, x indicates surface flaw, and ○ indicates. Indicates the case where neither slip nor surface flaw occurred. In this example, rolling speed is up to 800 mpm, strip surface roughness
Ra is 0.03 to 0.2 μm, the rolling oil used is mineral oil called straight oil, and the viscosity at 40 ℃ is 7 to 8 cst.
Is. From this figure, the optimum surface roughness of the wiping roll in this example is Ra in the range of 0.1 to 0.6 μm. The surface flaws referred to here are those caused by the roughness of the wiping roll being too high and the unevenness of the roll surface being transferred to the strip.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side sectional view of the vicinity of the roll wiping device. Reference numeral 1 is a strip, 2 is rolling oil adhered to both front and back surfaces of the strip, 3 is a pair of wiping rolls arranged directly above and below the strip, and 4 is roll polishing of the present invention attached to each wiping roll. In the apparatus, arrows represent the traveling direction of the strip, and show how the rolling oil 2 adhering to the surface of the strip 1 is wiped off by the wiping roll 3.

FIG. 2 is a detailed perspective view of the wiping roll 3 and the roll polishing device 4 in FIG. 1. 41 is a polishing belt, 42 is a pressing block, 43 is a spring, 44 is a pedestal, 45 is a holding plate, and 46 is a thumbscrew. Is. Although not shown, the pedestal 44 is fixed by being attached to the chock (bearing block) of the wiping roll 3, and the U-shaped polishing belt 41 whose both ends are fastened to the front and back of the pedestal 44 by the pressing plates 45.
Is pressed against the wiping roll 3 by a pressing block 42 via a spring 43.

With the above construction, the polishing belt 41 is constantly pressed against the wiping roll 3 by the spring 43 with a constant force, and the wiping roll 3 is polished by the polishing belt 41. The pedestal 44 is attached and the spring 43 is adjusted so as to be pressed uniformly in the width direction. If you press only the same position of the polishing belt 41, the belt itself will wear and the polishing force will decrease, so the thumbscrew should be used at any time.
By loosening 46 and shifting the polishing belt 41 to expose a new surface, the entire length of the polishing belt 41 can be used.
Needless to say, the roll polishing device 4 can be separated from the wiping roll 3 when the polishing belt 41 is replaced or when it is not necessary to use the roll polishing device 4.

An example of the relationship between the roughness of the polishing belt and the surface roughness of the wiping roll is shown in FIG. The horizontal axis represents the surface roughness of the wiping roll, and the vertical axis represents the roughness of the polishing belt in terms of the number of abrasive grains. ◯ represents the maximum value of roll roughness when polished, and ● represents the minimum value. According to FIG. 7 shown above, the optimum value of the surface roughness of the wiping roll is in the range of 0.1 to 0.6 μm in Ra, so as a polishing belt satisfying this,
It turns out that the range from 100 to 200 is preferable. In addition,
The rolling speed in FIG. 3 is 400 mpm, and the surface roughness of the strip is Ra 0.03 to 0.2 μm.

[0015]

According to the present invention, while the excellent wiping performance, which is an advantage of steel rolls, is always maintained, slipping between the roll and the strip does not occur, and therefore, wiping can be performed without causing slip flaws. became. In addition, since the wiping roll is constantly polished to prevent the surface roughness from being lowered, the service life of the wiping roll is extended, the replacement frequency of the wiping roll is reduced, and the production efficiency is improved.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view of an embodiment of the present invention.

FIG. 3 is a graph showing polishing results in an example of the present invention.

FIG. 4 is a conceptual diagram of a roll wiping device according to the present invention.

FIG. 5 is a conceptual diagram of a roll wiping device according to the present invention.

FIG. 6 is a side sectional view of a conventional rolling mill.

FIG. 7 is a graph showing the optimum surface roughness range of the wiping roll according to the present invention.

[Explanation of symbols]

 1 strip 2 rolling oil 3 wiping roll 4 roll polishing device 41 polishing belt 42 pressing block 43 spring 44 pedestal 45 pressing plate 46 thumbscrew 5 rolling machine

Claims (1)

[Claims] 1. A cold rolling mill for strips, comprising a roll polishing device that presses a polishing belt against the surface of the wiping rolls with a constant pressing force on the steel wiping rolls placed directly above and below the strips. A strip roll wiping device characterized by being attached.