JPH0699203A - Method and equipment for producing cold rolled stainless steel stock excellent in surface quality - Google Patents

Abstract

PURPOSE:To obtain a means by which a cold rolled stainless steel stock without the unevenness of gloss and excellent in surface quality is stably manufactured by reverse rolling. CONSTITUTION:At the time of manufacturing the stainless steel material by cold reverse rolling of two or more passes, a wiper 3 for material to be rolled is used on the inlet side of a rolling mill in addition to a wiper 3 for material to be rolled on the outlet side of the rolling mill 2 and rolling is executed while also bringing this wiper 3 on the inlet side of the rolling mill into contact with the surface of the material 1 to be rolled. And, the cold rolling equipment for manufacturing the cold rolled stainless steel stock excellent in surface quality is constituted by arranging the wipers 3, 3 for material to be rolled on the inlet and outled sides of the reversible rolling mill 2 and also arranging nozzles 4, 4 with which a lubricating oily agent is applied facing to the surface of the material to be rolled on the outside positions of the respective wipers 3, 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cold rolled material of stainless steel having a good surface quality by cold reversal rolling, and a cold rolling facility therefor.

[0002]

2. Description of the Related Art Generally, the surface quality of a cold rolled material of stainless steel is considered important, but such a cold rolled material of stainless steel is subjected to multi-pass rolling (reverse rolling) by a reversible rolling mill. In the case of manufacturing by (1), a method as shown in FIG. 3 is usually adopted.

That is, the material to be rolled (stainless steel material) 1 is rewound and fed to the reversible rolling mill 2, and the wiper 3 arranged on the delivery side of the rolling mill is closed (the wiper 3 is rolled by hydraulic pressure or the like). Material is sandwiched), and in this state, cold rolling is performed while spraying rolling oil for lubrication and cooling, and then wound. Then, in the next pass, the reversible rolling mill 2 is rotated in the reverse direction, and the wiper-3 that was closed in the previous pass (that is, the wiper on the rolling mill entrance side in the present pass) is opened and opened in the previous pass. The same wiper (the wiper on the delivery side of the rolling mill in the current pass) is closed and cold rolling is performed in the same manner.

Here, the reason why rolling is performed by installing the wiper-3 in the rolling equipment and closing the wiper on the delivery side of the rolling mill is the reason why the rolling material is sandwiched on the delivery side of the rolling mill. The purpose of this is to prevent rolling oil flowing along with the rolling oil and prevent telescoping (a phenomenon in which the coil pops out like a bamboo shoot) that tends to occur when the rolled material is wound into a coil.

In order to obtain a sufficient contact pressure at the contact portion of the wiper-3 with the material to be rolled and to enhance the dampening effect of rolling oil, a rubber having a groove-shaped outer surface as shown in FIG. 4 ( In general, a tube made of neoprene rubber) cut into a predetermined length is used.

[0006] However, in such cold rolling of stainless steel, the surface of the rolled material often has "gloss unevenness".
In some cases, a "belt-shaped pattern extending in the plate longitudinal direction" called ". When such gloss unevenness occurs, it is necessary to take measures such as removing the uneven glossy portion to manufacture the product, and the yield is significantly deteriorated, which is a problem.

However, it is known that similar gloss unevenness may occur in the rolling of electromagnetic steel sheets,
On the other hand, it has been reported that uneven gloss can be improved by devising the additive of rolling oil. However, no report has been made as to such a decisive measure for the uneven luster of stainless steel.

In view of the above, the object of the present invention is to prevent the uneven glossiness that tends to appear when cold multi-pass rolling is performed by a reversing rolling mill and to provide a stainless steel cold surface having a uniform surface gloss. It is to establish means for stably producing hot-rolled material.

[0009]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present inventors first investigated the cause of uneven glossiness during cold reversal rolling of stainless steel, and the main cause was It was confirmed that there were "abrasion powder of the material to be rolled generated during rolling" and "wear of the wiper".

That is, when stainless steel having a relatively high deformation resistance is cold-rolled, a considerable amount of metal abrasion powder is generated even if sufficient rolling oil is used. However, the generated metal abrasion powder is wiped off together with the rolling oil by a wiper on the delivery side of the rolling mill.However, since this wiper is pressed against the material to be rolled with a high pressure, its contact portion Of the metal wiper, and the above-mentioned groove of the wiper is crushed in a short period of time, and it becomes impossible to completely remove the stuck metal wear powder. Therefore, the material to be rolled is once wound with the metal abrasion powder adhered to the surface in the form of a local band. Therefore, since it is reversal rolling, when the coil is rewound and rolled again, it is rolled with the metal abrasion powder adhering unevenly in the width direction, so the surface gloss is also non-uniform in the width direction. Therefore, the gloss becomes uneven. Of course, the same result can be obtained when the material to be rolled that has passed through the rolling mill is reverse-rolled as it is without being wound up.

In this case, if a large amount of rolling oil is used to wash the surface of the material to be rolled, a small amount of metal abrasion powder will flow off, so that the unevenness of gloss will be improved to some extent, but still sufficient surface quality can be ensured. Didn't arrive. In particular, recently, since the viscosity of rolling oil tends to be lowered in response to higher rolling speed, metal abrasion powder is often generated, which is also disadvantageous in preventing uneven gloss.

Therefore, an attempt was made to maintain the wiper for each pass of rolling, but this method resulted in a significant decrease in production efficiency and was not suitable for actual operation.

However, as a result of many tests and examinations from various points of view, "at the time of reversal rolling of stainless steel, not only the wiper on the outlet side of the rolling mill but also the wiper on the inlet side of the rolling mill is observed. When the rolling is performed in the closed state as well, the non-uniform adhesion of the metal abrasion powder in the width direction of the material to be rolled can be eliminated and a product with no uneven gloss can be stably manufactured. I was able to get it.

The present invention has been completed based on the above findings and the like. "When manufacturing a stainless steel material by cold reversal rolling of two passes or more, as shown in FIG. In addition to the wiper-3 for rolled material on the exit side of the rolling mill 2, the wiper-3 for rolled material is used on the entry side of the rolling mill as well. By making it possible to stably produce a stainless steel cold-rolled material having good surface quality by rolling it in contact with the steel sheet, and further, as shown in FIG. , Cold-rolling equipment for producing stainless steel cold-rolled material with good surface quality, the wiper 3 and 3 for the material to be rolled are arranged on the inlet side and the outlet side of the reversible rolling mill 2, and Nozzle that applies lubricating oil to the outer surface of −3, 3 facing the surface of the material to be rolled. 4, 4 but also characterized by point "as a structure of arranging the.

The contact portion of the wiper with the material to be rolled is made of the neoprene rubber tube (shown in FIG. 4) from the viewpoint of heat resistance, oil resistance, wear resistance and the like. Preferably.

[0016]

In the present invention, as shown in FIGS. 1 and 2, in the rolling, the wiper-3 is used not only on the outlet side of the rolling mill but also on the inlet side of the rolling mill. Rolling is performed while making contact with the surface of the material 1 to be rolled (closed state). At this time, the wiper on the delivery side of the rolling mill is rolled together with the metal wear powder adhering to the surface of the material 1 to be rolled. It plays the role of an oil drainer that dams and removes oil.

However, when the wiper wears or the like, a portion where the adhered metal abrasion powder cannot be removed locally occurs, and this may remain on the surface of the material to be rolled in a strip shape and be wound as it is. However, even if the material to be rolled 1 on which the metal abrasion powder remains as described above is rolled in the next pass as it is, the wiper on the entrance side of the rolling mill is also closed to wipe the surface of the material to be rolled. The remaining metal abrasion powder is sent to the rolling mill 2 in a state where it is removed. Therefore, uneven gloss caused by adhesion of the metal abrasion powder is sufficiently prevented.

For example, even if local wear occurs on the wiper on the rolling mill entrance side, the local wear site may be the same position as the local wear site on the rolling mill exit side wiper in the width direction of the material to be rolled. Since it is rare, the metal abrasion powder adhering to the material to be rolled is removed by any wiper and is hardly brought to the rolling mill.

As described above, in reversal rolling of stainless steel, when both the wiper on the exit side of the rolling mill and the wiper on the entry side of the rolling mill are closed, cold rolling is performed while contacting the surface of the material to be rolled. In addition, a stainless steel cold-rolled material with good surface quality without uneven gloss can be obtained, and there is no fear of telescoping during winding.

An oil agent (mineral oil is sufficient) for lubrication is applied to the surface of the material to be rolled at the front side of the wiper installed on the inlet side of the rolling mill, for example, by the nozzle 4 as shown in FIG. If you apply a small amount by dropping or spraying, wiper
It is possible to effectively prevent the seizure of the oil, and to prevent a decrease in the effect of removing oil and abrasion metal powder.

In order to prevent rubbing marks caused by foreign matter biting into the wiper, as shown in FIG. 2, a sponge material (foam resin, etc.) 5 is provided between the wiper-3 and the material 1 to be rolled. It is effective to put in.

Then, as is clear from the above description,
It can be said that the means according to the present invention is more suitable for the production of BA material and hard material whose rolled surface is a product as it is.

Next, the effects of the present invention will be described more specifically by way of examples.

EXAMPLE A 0.25 mm thick cold-rolled sheet material from a SUS304 stainless steel coil (thickness: 1.0 mm, width: 630 mm) with the pass schedule shown in Table 1 using the reverse rolling equipment as shown in FIG. The manufacturing test was conducted.

[0024]

According to this test, even when seven coils were rolled, no uneven gloss was observed. On the contrary,
As shown in FIG. 3, when rolling was performed without using a wiper on the inlet side of the rolling mill, uneven gloss occurred in 5 products out of 7 coils.

[0026]

[Summary of Effects] As described above, according to the present invention, it is possible to stably manufacture a cold rolled stainless steel material having excellent surface quality without uneven gloss by reversible rolling. It has a useful effect.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the present invention.

FIG. 2 is an explanatory diagram according to another example of the present invention.

FIG. 3 is an explanatory diagram related to a conventional stainless steel cold rolled material reverse rolling.

FIG. 4 is an explanatory view of a rubber tube forming a wiper.

[Explanation of symbols]

 1 rolled material 2 reversible rolling mill 3 wiper 4 nozzle 5 sponge material

Claims (4)

[Claims] 1. When manufacturing a stainless steel material by cold reversal rolling of two or more passes, in addition to the wiper for the rolled material on the exit side of the rolling mill, the wiper for the rolled material on the entry side of the rolling mill is also used. A method for producing a cold rolled material of stainless steel having good surface quality, which comprises using the wiper on the inlet side of the rolling mill and bringing it into contact with the surface of the material to be rolled. 2. The rolling method according to claim 1, wherein an oil agent for lubrication is applied to the surface of the material to be rolled before the wiper for the material to be rolled, which is installed on the entrance side of the rolling mill. For producing a stainless steel cold-rolled material having good surface quality. 3. A cold rolled stainless steel with good surface quality according to claim 1 or 2, wherein a sponge material is sandwiched between the wiper for the rolled material and the rolled material to perform rolling. Method for manufacturing rolled material. 4. A wiper for a material to be rolled is arranged at the inlet side and the outlet side of a reversible rolling mill, and a nozzle for applying a lubricating oil agent is arranged at an outer position of each wiper so as to face the surface of the material to be rolled. A cold rolling facility for stainless steel, which is characterized by