CN118595193A - Oil removal system and method for multi-roll wide reversible cold rolling mill - Google Patents

Abstract

The present invention belongs to the field of cold rolling, and relates to a multi-roller wide-width reversible cold rolling mill degreasing system and method. The technical solution includes: a first roller group, a second roller group and an air knife. The first roller group includes two parallel felt rollers. The second roller group is arranged behind the first roller group along the running direction of the strip, and the second roller group includes two parallel copper rollers. The air knife is arranged behind the second roller group along the running direction of the strip, and the air knife includes a plurality of blowing nozzles, and the air knife blows air toward the upper surface and the lower surface of the strip.

Description

Oil removal system and method for multi-roll wide reversible cold rolling mill

Technical Field

The invention belongs to the field of cold rolling, and relates to an oil removal system and method for a multi-roller wide-width reversible cold rolling mill.

Background Art

Wide-width cold-rolled stainless steel sheets are usually rolled using 18-roll, 20-roll and other multi-roll wide-width reversible cold rolling mills. Especially for products with special specifications such as ultra-thin materials, ultra-wide materials, wide and thick cold plates, multi-pass reversible rolling is adopted. Special lubricating cooling medium is used during the cold rolling process, and the entrance and exit of the rolling mill are equipped with oil removal systems to remove residual oil on the surface of the strip during the rolling process to achieve good coil shape and surface quality. Under the current working conditions, a large amount of residual oil appears on the surface during the rolling process, and the curling process causes side slippage and poor coil shape, which makes it impossible to roll at high speed, resulting in a significant reduction in production efficiency. In severe cases, the strip breaks directly and cannot be rolled in one go, resulting in a significant increase in production costs. The problem of improving the oil removal effect has a great impact on rolling stability and needs to be quickly studied and solved.

Summary of the invention

In order to overcome the defects in the above-mentioned related technologies, on the one hand, some embodiments of the present invention provide a multi-roll wide-width reversible cold rolling mill oil removal system, which is arranged at the feed inlet and discharge port of the cold rolling mill.

The multi-roller wide width reversible cold rolling mill oil removal system comprises: a first roll group, a second roll group and an air knife. The first roll group comprises two parallel felt rolls. The second roll group is arranged behind the first roll group along the running direction of the strip steel, and the second roll group comprises two parallel copper rolls. The air knife is arranged behind the second roll group along the running direction of the strip steel, and the air knife comprises a plurality of blowing nozzles, and the air knife blows air toward the upper surface and the lower surface of the strip steel.

Preferably, the angle between the airflow direction blown out by the multiple blowing nozzles and the running direction of the strip steel is 60°~80°.

Preferably, the horizontal distance between the wind knife and the second roller group is 300-1000 mm.

Preferably, the height of the first roller set is 0-20 mm relative to the height of the rolling line.

Preferably, the convexity C2 of the rollers of the first roller set is 2.0-3.0 mm.

Preferably, the roughness of the rollers of the first roller set is 0.2-0.5 μm.

Preferably, the height of the second roller set is 0-20 mm lower than the rolling line.

Preferably, the crown of the rollers of the second roller set is C2=0.60-0.80 mm.

Preferably, the roughness of the rollers of the second roller set is 0.5-1.2 μm.

On the other hand, some embodiments of the present invention further provide a multi-roller wide-width reversible cold rolling mill deoiling method, which is applicable to the above-mentioned multi-roller wide-width reversible cold rolling mill deoiling system.

The multi-roller wide-width reversible cold rolling mill deoiling method comprises: setting the multi-roller wide-width reversible cold rolling mill deoiling system at the discharge port of the cold rolling mill; controlling the operation of the first roll group, the second roll group and the air knife to deoil the surface of the strip.

Among them, the pressure of the first roller group and the second roller group of 300 series stainless steel is selected to be 30-60bar, and the pressure of the first roller group and the second roller group of 400 series stainless steel is selected to be 25-40bar; the wind pressure of the wind knife is: 0.4~1.0Mpa.

The beneficial effects of the present invention are:

The present invention can realize the effective coordination between the roller oil removal device and the air knife, and the residual rolling oil on the surface of the strip after passing through the roller oil removal device is swept and removed by the strong wind curtain of the "air knife", thereby truly realizing the effect of "pre-removal + fine removal", and the residual oil on the surface is controlled below 100ppm.

The present invention can form a height difference match between the working roll, the first roll group and the second roll group by selecting the height, convexity and pressure parameters of the first roll group and the second roll group, thereby ensuring that the rolling oil on the strip surface is removed to the greatest extent.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG. 1 is a structural diagram of the present invention.

DETAILED DESCRIPTION

In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

As shown in FIG. 1 , on the one hand, some embodiments of the present invention provide a multi-roll wide-width reversible cold rolling mill oil removal system, which is arranged at the feed inlet and the discharge outlet of the cold rolling mill.

The multi-roller wide width reversible cold rolling mill oil removal system comprises: a first roll group 1, a second roll group 2 and an air knife 3. The first roll group 1 comprises two parallel felt rolls. The second roll group 2 is arranged behind the first roll group 1 along the strip running direction X, and the second roll group 2 comprises two parallel copper rolls. The air knife 3 is arranged behind the second roll group 2 along the strip running direction X, and the air knife 3 comprises a plurality of blowing nozzles, and the air knife 3 blows air toward the upper surface and the lower surface of the strip.

Preferably, the angle between the airflow direction blown out by the multiple blowing nozzles and the running direction of the strip steel is 60°~80°.

Preferably, the horizontal distance between the wind knife 3 and the second roller set 2 is 300-1000 mm.

Preferably, the height of the first roll set 1 is 0-20 mm relative to the height of the rolling line 4 , and the height of the first roll set 1 refers to the height of the horizontal center line of the gap between two rolls of the first roll set 1 from the ground.

Preferably, the convexity C2 of the rollers of the first roller set 1 is 2.0-3.0 mm.

Preferably, the roughness of the rollers of the first roller set 1 is 0.2-0.5 μm.

Preferably, the height of the second roll set 2 is 0-20 mm lower than the rolling line 4, and the height of the second roll set 2 refers to the height of the horizontal center line of the gap between two rolls of the second roll set 2 from the ground.

Preferably, the convexity C2 of the rollers of the second roller set 2 is 0.60-0.80 mm.

Preferably, the roughness of the rollers of the second roller set 2 is 0.5-1.2 μm.

On the other hand, some embodiments of the present invention further provide a multi-roller wide-width reversible cold rolling mill deoiling method, which is applicable to the above-mentioned multi-roller wide-width reversible cold rolling mill deoiling system.

The multi-roller wide-width reversible cold rolling mill deoiling method comprises: setting the multi-roller wide-width reversible cold rolling mill deoiling system at the discharge port of the cold rolling mill; controlling the operation of the first roll group, the second roll group and the air knife to deoil the surface of the strip.

Among them, the pressure of the first roller group and the second roller group of 300 series stainless steel is selected to be 30-60bar, and the pressure of the first roller group and the second roller group of 400 series stainless steel is selected to be 25-40bar; the wind pressure of the wind knife is: 0.4~1.0Mpa.

In some examples, as shown in Figure 1, the Sundvik S6-high eighteen-roll rolling mill (model S6-High-1250/200×2100) adopts a "four-roll oil removal device + air knife 3" system. The rollers of the first roller group 1 are felt rollers made of non-woven fabric, and the rollers of the second roller group 2 are high-hardness copper rollers. A group of air knives 3 are arranged on the upper and lower sides of the outer sides of the oil removal rollers. The horizontal distance between the air knife 3 and the second roller group 2 is controlled to be 500mm, and the vertical distance between the air knife 3 and the strip is controlled to be 200mm. The angle between the blowing nozzle of the air knife 3 and the strip is 75°, and the wind pressure is 0.6MPa. The height H1 of the first roller group 1 = the height of the rolling line 4 + 10mm, and the height H2 of the roller of the second roller group 2 = the height of the rolling line 4 - 10mm. The roll diameter of the first roll group 1 is 250mm, and the roll crown of the first roll group 1 is C2=2.8mm; the roll diameter of the second roll group 2 is 220mm, and the roll crown of the second roll group 2 is C2=0.70mm. The degreasing roll pressure of 300 series stainless steel is selected to be 30bar, and the roll roughness of the second roll group 2 is controlled at 0.5μm. Working rolls with a roughness of 0.8μm are used from the first pass to the pass before the finished product, and working rolls with a roughness of 0.2μm are used for the finished product pass. At the start of rolling, there is a lot of residual oil on the edge of the strip surface, and the degreasing roll pressure is increased to 40bar, and the residual oil on the surface is 80ppm.

In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A multi-roller wide reversible cold rolling mill oil removal system is arranged at the feed inlet and the discharge outlet of the cold rolling mill, characterized in that the multi-roller wide reversible cold rolling mill oil removal system comprises: a first roller set, the first roller set comprising two felt rollers arranged in parallel; A second roller group, the second roller group is arranged behind the first roller group along the running direction of the strip steel, and the second roller group includes two copper rollers arranged in parallel; A wind knife is arranged behind the second roller group along the running direction of the strip steel, and the wind knife includes a plurality of blowing nozzles, and the wind knife blows air toward the upper surface and the lower surface of the strip steel. 2. The multi-roll wide-width reversible cold rolling mill oil removal system according to claim 1 is characterized in that the angle between the air flow direction blown out by the multiple blowing nozzles and the running direction of the strip is 60°~80°. 3. The multi-roll wide-width reversible cold rolling mill oil removal system according to claim 1 is characterized in that the horizontal distance between the air knife and the second roller group is 300~1000mm. 4. The multi-roll wide-width reversible cold rolling mill oil removal system according to claim 1 is characterized in that the height of the first roll group is 0~20mm relative to the height of the rolling line. 5. The multi-roll wide-width reversible cold rolling mill oil removal system according to claim 1 is characterized in that the convexity C2 of the rollers of the first roller group is 2.0-3.0 mm. 6. The multi-roll wide-width reversible cold rolling mill oil removal system according to claim 1, characterized in that the roughness of the rollers of the first roller group is 0.2-0.5 μm. 7. The multi-roll wide-width reversible cold rolling mill oil removal system according to claim 1 is characterized in that the height of the second roll group is 0 to 20 mm lower than the rolling line. 8. The multi-roll wide-width reversible cold rolling mill oil removal system according to claim 1 is characterized in that the convexity C2 of the rollers of the second roller group is 0.60-0.80 mm. 9 . The multi-roll wide width reversible cold rolling mill oil removal system according to claim 1 , characterized in that the roughness of the rollers of the second roller group is 0.5-1.2 μm. 10. A multi-roller wide width reversible cold rolling mill degreasing method, applicable to the multi-roller wide width reversible cold rolling mill degreasing system according to claims 1 to 9, characterized in that the multi-roller wide width reversible cold rolling mill degreasing method comprises: The multi-roller wide width reversible cold rolling mill oil removal system is arranged at the discharge port of the cold rolling mill; Control the operation of the first roller group, the second roller group and the air knife to remove oil from the strip surface; Among them, the pressure of the first roller group and the second roller group of 300 series stainless steel is selected to be 30-60bar, and the pressure of the first roller group and the second roller group of 400 series stainless steel is selected to be 25-40bar; The wind pressure of the wind knife is: 0.4~1.0Mpa.