JPH02151306A - Method and apparatus for rolling stainless cold rolled steel sheet - Google Patents

Abstract

PURPOSE:To prevent scum soiling and gloss ununiformity and to maintain an output on the outlet side over a fixed value by inserting a stainless steel sheet between pinched rolls after the final rolling and supplying straight rolling oil to the stainless steel sheet before the pinch rolls. CONSTITUTION:On the outlet side of a cold rolling mill 10, straight rolling oil is sprayed from a spray equipment 18 to a stainless steel sheet 14. Then, the scum soiling causing defects such as gloss ununiformity and surface soiling is cleaned up by straight rolling oil high in solubility to scum. Further, the surface of the stainless steel sheet 14 is coated by the pinch roll 16 uniformly with the straight rolling oil to reduce the gloss uniformity from the steel sheet surface. Furthermore, water-soluble rolling oil low in friction coefficient is removed, the friction coefficient between the pinch roll 16 and the stainless steel plate 14 is increased, the tension on the outlet side of the cold rolling mill 10 can be kept high.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method and apparatus for rolling a cold-rolled stainless steel sheet that can roll the cold-rolled stainless steel sheet with high gloss and high efficiency.

[Conventional technology]

In cold rolling, there are two types of rolling oil: water-soluble rolling oil such as emulsion type and solution type, and straight oil type rolling oil made of 100% mineral oil such as paraffinic hydrocarbon. Cold-rolled steel sheets rolled using oil have less so-called scum contamination, which is made up of iron powder and oil, that adheres to the steel sheet after rolling, compared to cold-rolled steel sheets rolled using straight oil type rolling oil. , as shown in FIG. 3, is extremely large, 2 to 3 times as large. This scum stain causes uneven gloss and
This causes a defect called plate surface staining, which is especially fatal for high-gloss stainless steel plates. For this reason, conventionally, straight oil type rolling has been used when rolling high-gloss stainless steel sheets. However, the cooling ability of straight oil type rolling oil is significantly inferior to that of water-soluble rolling oil, and in order to compensate for the cooling ability, when using straight oil type rolling oil, the rolling speed must be lowered. There is a problem in that the production efficiency is reduced. In addition, in recent years, fully continuous tandem mills have been adopted for cold rolling for the purpose of high-efficiency rolling, but in these fully continuous tandem mills, the steel plate is shear-cut while rolling at the exit side of the final stand. After shear-cutting the steel plate, a priddle roll or leveler roll is often provided to hold the steel plate after the final stand in order to maintain the tension on the mill exit side while the steel plate is being wound around a tension reel. In a fully continuous tandem mill configured to maintain the tension at the mill exit side using such pry rolls or leveler rolls, in the case of cold rolled steel sheets rolled using water-soluble rolling oil as described above, the tension at the mill exit side cannot be maintained. It is difficult to maintain it above a certain level. That is, as mentioned above, cold-rolled steel sheets using water-soluble rolling oil have a lot of scum dirt containing oil and have a low coefficient of friction, so they slip with the pry roll or leveler roll and cannot maintain constant tension. It is from. In addition, if the exit tension is insufficient in this way, slip will occur between the steel plate and the work roll at the final stand of the continuous tandem mill, and this will significantly reduce the rolling efficiency of the fully continuous tandem mill. There is a point.

[Problem to be solved by the invention]

In other words, when high-gloss stainless steel is rolled using water-soluble rolling oil, not only defects such as uneven gloss and surface stains are likely to occur, but also the tension on the exit side of a fully continuous tandem mill cannot be maintained above a certain level. There is a problem. Furthermore, when a straight oil type rolling oil is used, there is a problem in that rolling efficiency is significantly reduced. This invention was made in view of the above-mentioned conventional problems, and eliminates the problems of reduced rolling efficiency, uneven gloss on the steel plate surface, plate surface stains, and insufficient tension on the outlet side of a fully continuous tandem mill. The purpose of the present invention is to provide a rolling method and device for rolling.

[Means to solve the problem]

In this invention, a stainless steel plate after final rolling is held between pinch rolls at a position between the exit side and the exit tension reel of a cold rolling mill that uses water-soluble rolling oil, and at the input side of the pinch rolls. The above object is achieved by a method for rolling a cold-rolled stainless steel sheet, which is characterized in that a straight oil type rolling oil is supplied to the stainless steel sheet. This invention relates to a cold rolling mill that uses water-soluble rolling oil, and a tension reel that is disposed between the exit side and the exit side tension reel of the cold rolling mill and that clamps a stainless steel plate after final rolling. and the input side of this pinch roll,
The above object is achieved by a rolling apparatus for cold-rolled stainless steel sheets, which includes an oil supply means for supplying straight oil type rolling oil between the pinch rolls and the stainless steel.

[Effect]

In this invention, a stainless steel plate rolled using water-soluble rolling oil is held between pinch rolls after final rolling, and straight oil type rolling oil is supplied to the stainless steel plate before the pinch rolls. ,Water-soluble rolling oil adhering to the stainless steel copper plate is cleaned, and at the same time, straight oil type rolling oil is applied to the surface of the stainless steel plate to increase the coefficient of friction with the pinch roll.
Without reducing rolling efficiency, scum stains can be removed to prevent uneven gloss and plate surface stains, and the tension at the exit of the rolling mill can be maintained above a certain level due to an increase in the coefficient of friction. Further, the pinch rolls can uniformly apply straight type rolling oil to the stainless steel plate after final rolling, and at the same time remove scum stains.

【Example】

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, this embodiment uses a fully continuous five-stand cold rolling mill 10 that uses water-soluble rolling oil.
A pinch roll 16 is arranged between the outlet side and the outlet tension reel 12 of the cold rolling mill 10 and pinches the stainless steel shoulder plate 14 after final rolling, and a pinch roll 16 is placed on the inlet side of the pinch roll 16. The apparatus includes a spray device 18 which is arranged and sprays straight oil type rolling oil onto the surface of the stainless steel shoulder plate 14, and constitutes a rolling device for cold rolled stainless steel sheets. Water-soluble rolling oil is supplied to the cold rolling mill 10 from a water-soluble rolling oil supply device 20 disposed below the cold rolling alio. Further, the straight oil type rolling oil is supplied to the spray device 18 from a straight oil type rolling oil supply device 22 arranged below the pinch rolls 16. Reference numeral 24 in FIG. 1 is a coil unwinding machine, 26 is a welding machine,
28 indicates an entry side louver, and 30 indicates a running cut shear. When a stainless steel plate was rolled using the rolling equipment shown in FIG. 1 under the rolling conditions shown in Table 1 below, as shown in FIG. 2, only water-soluble rolling oil was used in the cold rolling mill 10. In contrast to Condition 1, in which straight oil type rolling oil was not supplied to the pinch rolls 16, straight oil type rolling oil was sprayed onto the stainless steel plate 14 from the spray device 18 in front of the pinch rolls 16. Under Condition 2, it was confirmed that the gloss of the stainless steel sheet after rolling and the coefficient of friction at the pinch roll 16 were improved. Table 1: Stainless steel plate 14 on the exit side of rolling mill for cold rolling
When straight oil type rolling oil is sprayed from the spray device 18, scum stains that cause defects such as uneven gloss and surface stains on stainless steel shoulder plates are removed by the straight oil type rolling oil, which has a high scum solubility. The stainless steel sheet 14 is cleaned and straight oil type rolling oil is evenly applied to the surface of the stainless steel sheet 14 by the pinch rolls 16, thereby reducing uneven gloss on the surface of the steel sheet. The water-soluble rolling oil with a low friction IM coefficient is removed, and the straight oil type rolling oil adheres to the stainless steel plate 14, thereby increasing the friction coefficient between the pinch rolls 16 and the stainless steel plate 14, and rolling for cold rolling. The tension on the exit side of the machine 10 can be maintained high. Therefore, slippage between the stainless steel net plate 14 and the work rolls at the final stand of the cold rolling mill 10 is prevented. In the above embodiment, the straight oil type rolling oil is sprayed onto the stainless steel plate 14 by the spray device 18, but the straight oil type rolling oil is uniformly applied to the stainless steel plate 14 on the input side of the pinch rolls 16. Therefore, for example, straight oil type rolling oil may be supplied to the surface of the pinch roll 16 near the entrance side of the pinch roll 16. Even in this case, since the straight oil type rolling oil is oleophilic, it dissolves the scum dirt adhering to the surface of the stainless steel plate 14, and the straight oil type rolling oil adheres to the stainless steel plate 14. In addition, in the rolling mill 10 for cold rolling, rolling is performed using water-soluble rolling oil, so that rolling efficiency can be improved without reducing rolling efficiency.
The stainless steel plate 14 can be rolled.

【Effect of the invention】

Since the present invention is constructed as described above, it is possible to reduce uneven gloss of stainless steel sheets and stains on the sheet surface without reducing rolling efficiency, and to maintain high exit tension of a cold rolling mill. It has a great effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment of a rolling apparatus for cold rolling stainless steel according to the present invention; FIG. 2 is a line section showing a comparison of the effects of the rolling method of the present invention and a conventional rolling method; The figure shows a line section comparing the cases where a stainless steel plate is rolled using a water-soluble rolling oil and a straight oil type rolling oil. 0...Rolling mill for cold rolling, 2...Outside tension reel, 4...Stainless steel plate, 6...Pinch roll, 8...Spray device, 0...Water-soluble/specific rolling Oil supply device, 2... Straight oil type rolling oil supply device.

Claims (2)

[Claims] (1) At a position between the exit side and the exit tension reel of a cold rolling mill that uses water-soluble rolling oil, the stainless steel plate after final rolling is held between pinch rolls, and at the input side of the pinch rolls. A method for rolling stainless steel cold-rolled steel sheets, characterized by supplying straight oil type rolling oil to the stainless steel sheets. (2) A cold rolling mill that uses water-soluble rolling oil, and pinch rolls that are placed between the outlet side and the outlet tension reel of this cold rolling mill and that clamp the stainless steel sheet after final rolling. and an oil supply means for supplying straight oil type rolling oil between the pinch rolls and the stainless steel on the input side of the pinch rolls.