CN110125190B - Method and device for preventing edge crack of strip steel in rolling - Google Patents
Method and device for preventing edge crack of strip steel in rolling Download PDFInfo
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- CN110125190B CN110125190B CN201910444656.5A CN201910444656A CN110125190B CN 110125190 B CN110125190 B CN 110125190B CN 201910444656 A CN201910444656 A CN 201910444656A CN 110125190 B CN110125190 B CN 110125190B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
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Abstract
The invention discloses a method and a device for preventing edge crack of strip steel rolling, which relate to the technical field of steel rolling, and the method comprises the following steps: carrying out hot rolling coiling according to coiling temperature control in a groove type coiling temperature change curve to obtain multi-coil strip steel; when a welding seam formed by welding two adjacent coils of strip steel and a cold-rolled strip head and a cold-rolled strip tail connected with the welding seam are rolled by a cold continuous rolling mill, the tension between the frames is improved; when the welding seam and a first preset area of a previous coil of strip steel and a second preset area of a next coil of strip steel which are connected by the welding seam are rolled by the cold continuous rolling mill, the positive bending roll force of each rack of the cold continuous rolling mill is improved; controlling the coiled strip steel to be continuously rolled by a cold continuous rolling mill; the method reduces the rolling edge cracks of the welding seams and the positions near the welding seams, avoids the accidents of strip breakage and the like, improves the quality of strip steel products, and solves the technical problem of edge cracks near the welding seams of the strip steel after cold continuous rolling in the prior art.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a method and a device for preventing edge crack of strip steel in rolling.
Background
The strip steel is a steel plate produced by various steel rolling enterprises in order to meet the requirements of different industrial departments on industrialized production of various types of metal or mechanical products, such as automobile plates and high-grade household appliance plates.
In the prior art, when a cold continuous rolling process is adopted to roll strip steel, edge crack defects exist near the welding seam of the strip steel after cold continuous rolling in the production process, so that the quality of the strip steel is influenced, strip breakage accidents are easy to occur, and the stable operation and the capacity exertion of an acid rolling production line are seriously influenced.
Disclosure of Invention
The embodiment of the application provides a method and a device for preventing edge crack during strip steel rolling, and solves the technical problem that edge crack defects exist near the welding seam of strip steel after cold continuous rolling in the related technology.
On one hand, the present application provides the following technical solutions through an embodiment of the present application:
a method of preventing edge cracking in rolling of a strip, the method comprising:
carrying out hot rolling coiling according to coiling temperature control in a groove type coiling temperature change curve to obtain multi-coil strip steel; the groove type coiling temperature change curve is used for representing the corresponding relation between the coiling temperature and the strip steel coiling length;
welding seam formed by welding two adjacent coils of strip steel and
when the cold-rolled strip head and the cold-rolled strip tail connected by the welding seam are rolled by a cold continuous rolling mill, judging whether the rolling speed of the cold continuous rolling mill is less than a preset value, if so, increasing the tension between the frames by 10-40%;
and when the welding seam and a first preset area of the previous coil of strip steel and a second preset area of the next coil of strip steel which are connected by the welding seam are rolled by the cold continuous rolling mill, the positive bending roll force of each frame of the cold continuous rolling mill is improved by 5-30%.
Optionally, in the groove-shaped coiling temperature variation curve, a first coiling temperature corresponding to a hot-rolled strip head of the strip steel and a second coiling temperature corresponding to a hot-rolled strip tail of the strip steel are higher than a third coiling temperature corresponding to a hot-rolled middle section of the strip steel.
Optionally, the first coiling temperature is greater than the second coiling temperature.
Optionally, the first coiling temperature and the second coiling temperature are both 20-30 ℃ higher than the third coiling temperature.
Optionally, in the groove-type coiling temperature change curve, the slope type of the curve corresponding to the first coiling temperature is excessive to the curve corresponding to the third coiling temperature, and the slope type of the curve corresponding to the third coiling temperature is excessive to the curve corresponding to the second coiling temperature.
Optionally, the preset value is 300 m/min.
Optionally, the cold continuous rolling mill is a five-stand tandem continuous rolling mill, and the method for improving the tension between the stands by 10 to 40% specifically includes:
improving the tension between the first frame and the second frame and between the second frame and the third frame of the five-frame tandem continuous rolling mill by 20-40%;
the tension between the third frame and the fourth frame and between the fourth frame and the fifth frame of the five-frame tandem type continuous rolling mill is improved by 10-30%;
the improvement range of the tension between the first frame and the second frame and the improvement range of the tension between the second frame and the third frame are larger than the improvement range of the tension between the third frame and the fourth frame and the improvement range of the tension between the fourth frame and the fifth frame.
Optionally, the first preset area is a strip steel within 5-20m of one side of the welding seam along the rolling speed direction, and the second preset area is a strip steel within 30-60m of one side of the welding seam along the opposite direction of the rolling speed.
Optionally, the cold continuous rolling mill is a five-stand tandem continuous rolling mill, and the positive bending force of each stand of the cold continuous rolling mill is improved by 5-30%, and the method specifically includes:
the positive bending roll force of the middle rolls of the front four frames of the five-frame tandem type continuous rolling mill is respectively improved by 10-30%;
the positive bending roll force of the working rolls of the first four frames of the five-frame tandem type continuous rolling mill is respectively improved by 5-15%;
the improvement range of the positive bending force of the middle roller of the front four frames is larger than that of the working roller.
In another aspect, the present application provides an apparatus for preventing a strip rolling edge crack, the apparatus including:
the coiling module is used for carrying out hot rolling coiling according to coiling temperature control in the groove type coiling temperature change curve to obtain multi-coil strip steel; the groove type coiling temperature change curve is used for representing the corresponding relation between the coiling temperature and the strip steel coiling length;
the tension control module is used for judging whether the rolling speed of the cold continuous rolling mill is less than a preset value or not when a welding seam formed by welding two adjacent coils of strip steel and a cold-rolled strip head and a cold-rolled strip tail connected with the welding seam are rolled by the cold continuous rolling mill, and if so, the tension between the racks is increased by 10-40%;
and the bending force control module is used for improving the positive bending force of each rack of the cold continuous rolling mill by 5-30% when the welding seam and a first preset area of a previous coil of strip steel and a second preset area of a next coil of strip steel which are connected by the welding seam are rolled by the cold continuous rolling mill.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the method, hot rolling coiling is carried out according to coiling temperature control in a groove-shaped coiling temperature change curve to obtain a plurality of coils of strip steel, wherein the groove-shaped coiling temperature change curve is used for representing the corresponding relation between coiling temperature and strip steel coiling length, so that the change of the hot rolling temperature along with the coiling of the strip steel is considered, and cracks caused by temperature difference in subsequent rolling are avoided; then, when a welding seam formed by welding the head and the tail of two adjacent rolls of strip steel and a cold-rolled strip head and a cold-rolled strip tail connected with the welding seam are rolled by a cold continuous rolling mill, judging whether the rolling speed of the cold continuous rolling mill is less than a preset value, and if so, increasing the tension between the frames by 10-40%; when the welding seam and the first preset area of the previous coil of strip steel and the second preset area of the next coil of strip steel which are connected by the welding seam are rolled by the cold continuous rolling mill, the positive roll bending force of each frame of the cold continuous rolling mill is improved by 5-30%, the tension and the roll bending force are improved when the welding seam machine is cold rolled in a preset area, on the basis of high-speed steady rolling tension, the tension between the frames when a welding seam area is rolled is increased, the roller bending force is increased when an area near the welding seam is rolled by cold continuous rolling, namely, on the basis of high-speed steady rolling tension, the roll bending force of each frame in the process of rolling a welding seam area is increased, the specific value ranges of the improved tension and the roll bending force are obtained through tests, further reducing the edge crack of the welding seam and the rolling near the welding seam, avoiding the accidents of strip breakage and the like, improving the quality of strip steel products and solving the technical problem of the edge crack defect near the welding seam of the strip steel after cold continuous rolling in the prior art.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method for preventing edge cracking in rolling a strip steel according to an embodiment of the present invention;
FIG. 2 is a schematic view of a groove type coiling temperature variation curve according to an embodiment of the present invention;
FIG. 3 is a structural view of an apparatus for preventing edge crack of a rolled strip in another embodiment of the present invention.
Detailed Description
The embodiment of the application provides a method for preventing the edge crack of the rolled strip steel, and solves the technical problem that the edge crack defect exists near the welding seam of the strip steel after cold continuous rolling in the prior art.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
a method of preventing edge cracking in rolling of a strip, the method comprising:
carrying out hot rolling coiling according to coiling temperature control in a groove type coiling temperature change curve to obtain multi-coil strip steel; the groove type coiling temperature change curve is used for representing the corresponding relation between the coiling temperature and the strip steel coiling length; when a welding seam formed by welding two adjacent coils of strip steel and a cold-rolled strip head and a cold-rolled strip tail connected with the welding seam are rolled by a cold continuous rolling mill, judging whether the rolling speed of the cold continuous rolling mill is less than a preset value or not, and if so, increasing the tension between the frames by 10-40%; and when the welding seam and a first preset area of the previous coil of strip steel and a second preset area of the next coil of strip steel which are connected by the welding seam are rolled by the cold continuous rolling mill, the positive bending roll force of each frame of the cold continuous rolling mill is improved by 5-30%.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Example one
In this embodiment, a method for preventing edge crack of strip steel rolling, referring to fig. 1, includes:
s101, carrying out hot rolling coiling according to coiling temperature control in a groove type coiling temperature change curve to obtain multi-coil strip steel; the groove type coiling temperature change curve is used for representing the corresponding relation between the coiling temperature and the strip steel coiling length;
s102, when a welding seam formed by welding two adjacent coils of strip steel and a cold-rolled strip head and a cold-rolled strip tail connected with the welding seam are rolled by a cold continuous rolling mill, judging whether the rolling speed of the cold continuous rolling mill is less than a preset value, and if so, increasing the tension between the frames by 10-40%;
s103, when the welding seam and a first preset area of a previous coil of strip steel and a second preset area of a next coil of strip steel which are connected by the welding seam are rolled by the cold continuous rolling mill, the positive bending roll force of each rack of the cold continuous rolling mill is improved by 5-30%.
In hot rolling and coiling, the steel strip is coiled into a coil, called a coil, and is rolled in a cold rolling mill after the ends of the steel strip are welded and connected before the cold rolling process.
Referring to fig. 1, S101 is first executed to perform hot rolling coiling according to coiling temperature control in a groove type coiling temperature variation curve to obtain a plurality of coils of strip steel; the groove type coiling temperature change curve is used for representing the corresponding relation between the coiling temperature and the strip steel coiling length.
Specifically, referring to fig. 2, in the groove-type coiling temperature variation curve, a first coiling temperature corresponding to a hot-rolled strip head of the strip steel and a second coiling temperature corresponding to a hot-rolled strip tail of the strip steel are higher than a third coiling temperature corresponding to a hot-rolled middle section of the strip steel, and the first coiling temperature is higher than the second coiling temperature.
The hot-rolled strip head corresponds to the strip tail in the cold rolling process, and the length of the strip head after the cold rolling is longer than that of the hot-rolled strip head because the cold-rolled strip tail is rolled.
More specifically, the first coiling temperature and the second coiling temperature are both 20-30 ℃ higher than the third coiling temperature.
Wherein the length of the hot-rolled strip head is 20-40 m, and the length of the hot-rolled strip tail is 30-60 m.
As an alternative embodiment, referring to fig. 3, in order to make the temperature transition gentle, in the groove type winding temperature variation curve, the curve corresponding to the first winding temperature is changed to the curve corresponding to the third winding temperature, and the curve corresponding to the third winding temperature is changed to the curve corresponding to the second winding temperature.
Specifically, the ramp transition may be linear or non-linear arc, as long as the ramp transition is slow, rather than at a certain take-up point, to change the temperature directly from one value to another.
And then, S102 is executed, when a welding seam formed by welding two adjacent coils of strip steel and a cold-rolled strip head and a cold-rolled strip tail connected with the welding seam are rolled by a cold continuous rolling mill, whether the rolling speed of the cold continuous rolling mill is smaller than a preset value or not is judged, and if yes, the tension between the racks is increased by 10-40%.
Specifically, the cold continuous rolling mill may be a single-stand or multi-stand, and if the single-stand is used, the tension at both ends is increased, as an optional embodiment, the cold continuous rolling mill is a five-stand tandem continuous rolling mill, and if the preset value is 300m/min,
the method for improving the tension between the frames by 10-40% specifically comprises the following steps:
improving the tension between the first frame and the second frame and between the second frame and the third frame of the five-frame tandem continuous rolling mill by 20-40%;
the tension between the third frame and the fourth frame and between the fourth frame and the fifth frame of the five-frame tandem type continuous rolling mill is improved by 10-30%;
the improvement range of the tension between the first frame and the second frame and the improvement range of the tension between the second frame and the third frame are larger than the improvement range of the tension between the third frame and the fourth frame and the improvement range of the tension between the fourth frame and the fifth frame.
As an alternative embodiment, the front and rear preset regions of the weld seam include:
the strip steel of the welding seam in 5-20m at one side along the rolling speed direction and the strip steel of the welding seam in 30-60m at one side along the reverse rolling speed direction.
As an optional implementation manner, the method for improving the positive bending force of each frame of the cold continuous rolling mill by 5-30% specifically comprises the following steps:
the positive bending roll force of the middle rolls of the front four frames of the five-frame tandem type continuous rolling mill is respectively improved by 10-30%;
the positive bending roll force of the working rolls of the first four frames of the five-frame tandem type continuous rolling mill is respectively improved by 5-15%;
the improvement range of the positive bending force of the middle roller of the front four frames is larger than that of the working roller.
And S103 is executed while S102 is executed, and when the welding seam and the first preset area of the previous coil of strip steel and the second preset area of the next coil of strip steel which are connected by the welding seam are rolled by the cold continuous rolling mill, the positive bending roll force of each rack of the cold continuous rolling mill is improved by 5-30%.
Specifically, as an optional implementation manner, the first preset area is a strip steel of which the welding seam is within 5-20m of one side in the rolling speed direction, and the second preset area is a strip steel of which the welding seam is within 30-60m of one side in the opposite direction of the rolling speed.
As an optional implementation manner, the cold continuous rolling mill is a five-stand tandem continuous rolling mill, and the positive bending force of each stand of the cold continuous rolling mill is increased by 5 to 30%, specifically including:
the positive bending roll force of the middle rolls of the front four frames of the five-frame tandem type continuous rolling mill is respectively improved by 10-30%;
the positive bending roll force of the working rolls of the first four frames of the five-frame tandem type continuous rolling mill is respectively improved by 5-15%;
the improvement range of the positive bending force of the middle roller of the front four frames is larger than that of the working roller.
The process of the present invention is described in detail below with reference to examples.
Example 1:
a method for preventing edge cracking of a strip steel in rolling, referring to fig. 1, the method comprising:
s101, carrying out hot rolling coiling according to coiling temperature control in a groove type coiling temperature change curve to obtain multi-coil strip steel; the groove type coiling temperature change curve is used for representing the corresponding relation between the coiling temperature and the strip steel coiling length;
s102, when a welding seam formed by welding two adjacent coils of strip steel and a cold-rolled strip head and a cold-rolled strip tail connected with the welding seam are rolled by a cold continuous rolling mill, judging whether the rolling speed of the cold continuous rolling mill is less than a preset value, and if so, increasing the tension between the frames by 10-40%;
s103, when the welding seam and a first preset area of a previous coil of strip steel and a second preset area of a next coil of strip steel which are connected by the welding seam are rolled by the cold continuous rolling mill, the positive bending roll force of each rack of the cold continuous rolling mill is improved by 5-30%.
Specifically, the method comprises the following steps:
the length of the hot-rolled strip head is 20m, and the length of the hot-rolled strip tail is 30 m;
the third coiling temperature was 500 ℃.
Specifically, the cold continuous rolling mill is a five-frame tandem continuous rolling mill:
the preset value is 200 m/min;
the cold continuous rolling mill is a five-frame tandem continuous rolling mill, and the tension between a first frame and a second frame of the five-frame tandem continuous rolling mill and the tension between a second frame and a third frame of the five-frame tandem continuous rolling mill are improved by 20%; and the tension between the third and fourth stands and the tension between the fourth and fifth stands of the five-stand tandem continuous rolling mill are improved by 10 percent.
The cold continuous rolling mill is a five-rack tandem continuous rolling mill, the first preset area is strip steel of which the welding seam is within 5m of one side in the rolling speed direction, and the second preset area is strip steel of which the welding seam is within 30m of one side in the opposite direction of the rolling speed.
The positive roll bending force of each frame of the cold continuous rolling mill is improved by 5-30%, and the method specifically comprises the following steps:
the positive roll bending force of the middle rolls of the front four frames of the five-frame tandem type continuous rolling mill is respectively improved by 10 percent;
the positive bending roll force of the working rolls of the first four frames of the five-frame tandem type continuous rolling mill is respectively improved by 5 percent;
the improvement range of the positive bending force of the middle roller of the front four frames is larger than that of the working roller.
Example 2:
a method for preventing edge cracking of a strip steel in rolling, referring to fig. 1, the method comprising:
s101, carrying out hot rolling coiling according to coiling temperature control in a groove type coiling temperature change curve to obtain multi-coil strip steel; the groove type coiling temperature change curve is used for representing the corresponding relation between the coiling temperature and the strip steel coiling length;
s102, when a welding seam formed by welding two adjacent coils of strip steel and a cold-rolled strip head and a cold-rolled strip tail connected with the welding seam are rolled by a cold continuous rolling mill, judging whether the rolling speed of the cold continuous rolling mill is less than a preset value, and if so, increasing the tension between the frames by 10-40%;
s103, when the welding seam and a first preset area of a previous coil of strip steel and a second preset area of a next coil of strip steel which are connected by the welding seam are rolled by the cold continuous rolling mill, the positive bending roll force of each rack of the cold continuous rolling mill is improved by 5-30%.
Specifically, the method comprises the following steps:
the length of the hot-rolled strip head is 40m, and the length of the hot-rolled strip tail is 60 m;
the third coiling temperature was 780 ℃.
Specifically, the cold continuous rolling mill is a five-frame tandem continuous rolling mill:
the preset value is 280 m/min;
improving the tension between the first frame and the second frame and between the second frame and the third frame of the five-frame tandem type continuous rolling mill by 40 percent; and the tension between the third and fourth stands and the tension between the fourth and fifth stands of the five-stand tandem continuous rolling mill are improved by 30 percent.
The cold continuous rolling mill is a five-rack tandem continuous rolling mill, the first preset area is strip steel with the weld joint within 20m of one side in the rolling speed direction, and the second preset area is strip steel with the weld joint within 60m of one side in the opposite direction of the rolling speed.
The positive roll bending force of each frame of the cold continuous rolling mill is improved by 5-30%, and the method specifically comprises the following steps:
the front four of the five-frame tandem continuous rolling mill
The positive roll bending force of the middle roll of each frame is respectively improved by 30 percent;
the positive bending roll force of the working rolls of the first four frames of the five-frame tandem type continuous rolling mill is respectively improved by 15 percent;
the improvement range of the positive bending force of the middle roller of the front four frames is larger than that of the working roller.
Example 3:
a method for preventing edge cracking of a strip steel in rolling, referring to fig. 1, the method comprising:
s101, carrying out hot rolling coiling according to coiling temperature control in a groove type coiling temperature change curve to obtain multi-coil strip steel; the groove type coiling temperature change curve is used for representing the corresponding relation between the coiling temperature and the strip steel coiling length;
s102, when a welding seam formed by welding two adjacent coils of strip steel and a cold-rolled strip head and a cold-rolled strip tail connected with the welding seam are rolled by a cold continuous rolling mill, judging whether the rolling speed of the cold continuous rolling mill is less than a preset value, and if so, increasing the tension between the frames by 10-40%;
s103, when the welding seam and a first preset area of a previous coil of strip steel and a second preset area of a next coil of strip steel which are connected by the welding seam are rolled by the cold continuous rolling mill, the positive bending roll force of each rack of the cold continuous rolling mill is improved by 5-30%.
Specifically, the method comprises the following steps:
the length of the hot-rolled strip head is 30m, and the length of the hot-rolled strip tail is 40 m;
the third coiling temperature was 580 ℃.
Specifically, the cold continuous rolling mill is a five-frame tandem continuous rolling mill:
the preset value is 260 m/min;
improving the tension between the first frame and the second frame and between the second frame and the third frame of the five-frame tandem type continuous rolling mill by 30 percent; and the tension between the third and fourth stands and the tension between the fourth and fifth stands of the five-stand tandem continuous rolling mill are improved by 20 percent.
Specifically, the cold continuous rolling mill is a five-frame tandem continuous rolling mill:
the cold continuous rolling mill is a five-rack tandem continuous rolling mill, the first preset area is strip steel with the weld seam within 10m of one side in the rolling speed direction, and the second preset area is strip steel with the weld seam within 40m of one side in the opposite direction of the rolling speed.
The positive roll bending force of each frame of the cold continuous rolling mill is improved by 5-30%, and the method specifically comprises the following steps:
the positive roll bending force of the middle rolls of the front four frames of the five-frame tandem type continuous rolling mill is respectively improved by 20 percent;
the positive bending roll force of the working rolls of the first four frames of the five-frame tandem type continuous rolling mill is respectively improved by 10 percent;
the improvement range of the positive bending force of the middle roller of the front four frames is larger than that of the working roller.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
according to the method, hot rolling coiling is carried out according to coiling temperature control in a groove-shaped coiling temperature change curve to obtain a plurality of coils of strip steel, wherein the groove-shaped coiling temperature change curve is used for representing the corresponding relation between coiling temperature and strip steel coiling length, so that the change of the hot rolling temperature along with the coiling of the strip steel is considered, and cracks caused by temperature difference in subsequent rolling are avoided; then, when a welding seam formed by welding the head and the tail of two adjacent rolls of strip steel and a cold-rolled strip head and a cold-rolled strip tail connected with the welding seam are rolled by a cold continuous rolling mill, judging whether the rolling speed of the cold continuous rolling mill is less than a preset value, and if so, increasing the tension between the frames by 10-40%; when the welding seam and the first preset area of the previous coil of strip steel and the second preset area of the next coil of strip steel which are connected by the welding seam are rolled by the cold continuous rolling mill, the positive roll bending force of each frame of the cold continuous rolling mill is improved by 5-30%, the tension and the roll bending force are improved when the welding seam machine is cold rolled in a preset area, on the basis of high-speed steady rolling tension, the tension between the frames when a welding seam area is rolled is increased, the roller bending force is increased when an area near the welding seam is rolled by cold continuous rolling, namely, on the basis of high-speed steady rolling tension, the roll bending force of each frame in the process of rolling a welding seam area is increased, the specific value ranges of the improved tension and the roll bending force are obtained through tests, further reducing the edge crack of the welding seam and the rolling near the welding seam, avoiding the accidents of strip breakage and the like, improving the quality of strip steel products and solving the technical problem of the edge crack defect near the welding seam of the strip steel after cold continuous rolling in the prior art.
Example two
In this embodiment, an apparatus for preventing edge crack in rolling of a strip steel, referring to fig. 3, the apparatus includes:
the coiling module is used for carrying out hot rolling coiling according to coiling temperature control in the groove type coiling temperature change curve to obtain multi-coil strip steel; the groove type coiling temperature change curve is used for representing the corresponding relation between the coiling temperature and the strip steel coiling length;
the tension control module is used for judging whether the rolling speed of the cold continuous rolling mill is less than a preset value or not when a welding seam formed by welding two adjacent coils of strip steel and a cold-rolled strip head and a cold-rolled strip tail connected with the welding seam are rolled by the cold continuous rolling mill, and if so, the tension between the racks is increased by 10-40%;
and the bending force control module is used for improving the positive bending force of each rack of the cold continuous rolling mill by 5-30% when the welding seam and a first preset area of a previous coil of strip steel and a second preset area of a next coil of strip steel which are connected by the welding seam are rolled by the cold continuous rolling mill.
Since the device for preventing edge cracking of strip steel rolling described in this embodiment is a device used for implementing the method for preventing edge cracking of strip steel rolling in the first embodiment of this application, a person skilled in the art can understand the specific implementation manner of the device of this embodiment and its various modifications based on the method for preventing edge cracking of strip steel rolling described in the first embodiment of this application, and therefore, how to implement the method in this embodiment of this application by the system will not be described in detail here. The technical personnel in the field can apply the device adopted by the method for preventing the strip rolling edge crack of the commodity in the embodiment of the application to the protection scope of the application.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A method for preventing edge cracking in rolling of a strip, the method comprising:
carrying out hot rolling coiling according to coiling temperature control in a groove type coiling temperature change curve to obtain multi-coil strip steel; the groove-shaped coiling temperature change curve is used for representing the corresponding relation between the coiling temperature and the strip steel coiling length, and in the groove-shaped coiling temperature change curve, a first coiling temperature corresponding to a hot rolling strip head of the strip steel and a second coiling temperature corresponding to a hot rolling strip tail of the strip steel are higher than a third coiling temperature corresponding to a hot rolling middle section of the strip steel;
when a welding seam formed by welding two adjacent coils of strip steel and a cold-rolled strip head and a cold-rolled strip tail connected with the welding seam are rolled by a cold continuous rolling mill, judging whether the rolling speed of the cold continuous rolling mill is less than a preset value or not, and if so, increasing the tension between the frames by 10-40%;
when the welding seam and a first preset area of a previous coil of strip steel and a second preset area of a next coil of strip steel which are connected by the welding seam are rolled by the cold continuous rolling mill, the positive bending roll force of each frame of the cold continuous rolling mill is improved by 5-30%; the first preset area is strip steel of which the welding line is within 5-20m of one side in the rolling speed direction, and the second preset area is strip steel of which the welding line is within 30-60m of one side in the opposite direction of the rolling speed.
2. The method of claim 1, wherein the first coiling temperature is greater than the second coiling temperature.
3. The method of claim 2, wherein the first coiling temperature and the second coiling temperature are both 20 to 30 ℃ higher than the third coiling temperature.
4. The method according to claim 3, wherein in the fluted winding temperature profile, the first winding temperature corresponds to a ramp profile that transitions to the third winding temperature, and the third winding temperature corresponds to a ramp profile that transitions to the second winding temperature.
5. The method of claim 1, wherein the predetermined value is 300 m/min.
6. The method of claim 1, wherein the cold continuous rolling mill is a five-stand tandem continuous rolling mill, and the increasing the tension between the stands by 10-40% comprises:
improving the tension between the first frame and the second frame and between the second frame and the third frame of the five-frame tandem continuous rolling mill by 20-40%;
the tension between the third frame and the fourth frame and between the fourth frame and the fifth frame of the five-frame tandem type continuous rolling mill is improved by 10-30%;
the improvement range of the tension between the first frame and the second frame and the improvement range of the tension between the second frame and the third frame are larger than the improvement range of the tension between the third frame and the fourth frame and the improvement range of the tension between the fourth frame and the fifth frame.
7. The method of claim 6, wherein the cold continuous rolling mill is a five-stand tandem continuous rolling mill, and the step of increasing the positive roll bending force of each stand of the cold continuous rolling mill by 5-30% comprises:
the positive bending roll force of the middle rolls of the front four frames of the five-frame tandem type continuous rolling mill is respectively improved by 10-30%;
the positive bending roll force of the working rolls of the first four frames of the five-frame tandem type continuous rolling mill is respectively improved by 5-15%;
the improvement range of the positive bending force of the middle roller of the front four frames is larger than that of the working roller.
8. An apparatus for preventing edge crack in rolling a strip, the apparatus comprising:
the coiling module is used for carrying out hot rolling coiling according to coiling temperature control in the groove type coiling temperature change curve to obtain multi-coil strip steel; the groove-shaped coiling temperature change curve is used for representing the corresponding relation between the coiling temperature and the strip steel coiling length, and in the groove-shaped coiling temperature change curve, a first coiling temperature corresponding to a hot rolling strip head of the strip steel and a second coiling temperature corresponding to a hot rolling strip tail of the strip steel are higher than a third coiling temperature corresponding to a hot rolling middle section of the strip steel;
the tension control module is used for judging whether the rolling speed of the cold continuous rolling mill is less than a preset value or not when a welding seam formed by welding two adjacent coils of strip steel and a cold-rolled strip head and a cold-rolled strip tail connected with the welding seam are rolled by the cold continuous rolling mill, and if so, the tension between the racks is increased by 10-40%;
the bending force control module is used for improving the positive bending force of each rack of the cold continuous rolling mill by 5-30% when the welding seam and a first preset area of a previous coil of strip steel and a second preset area of a next coil of strip steel which are connected by the welding seam are rolled by the cold continuous rolling mill; the first preset area is strip steel of which the welding line is within 5-20m of one side in the rolling speed direction, and the second preset area is strip steel of which the welding line is within 30-60m of one side in the opposite direction of the rolling speed.
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| CN114130825B (en) * | 2021-11-30 | 2023-11-17 | 攀钢集团攀枝花钢钒有限公司 | Method for removing sleeve from ultrathin material winding core and winding |
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