CN111215449A - Hot-rolled strip steel rough rolling double-rack rolling process - Google Patents
Hot-rolled strip steel rough rolling double-rack rolling process Download PDFInfo
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- CN111215449A CN111215449A CN202010042113.3A CN202010042113A CN111215449A CN 111215449 A CN111215449 A CN 111215449A CN 202010042113 A CN202010042113 A CN 202010042113A CN 111215449 A CN111215449 A CN 111215449A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
- B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
- B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
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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
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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
- B21B37/58—Roll-force control; Roll-gap 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
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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Abstract
The invention provides a hot-rolled strip steel rough rolling double-rack rolling process, which is carried out according to the following procedures: a first step: the method comprises the following steps that an original strip steel blank is conveyed to a first rough rolling edger through an inlet roller way, and the first rough rolling edger performs width hot rolling on the original strip steel blank to obtain a first strip steel blank; a second step: the rough rolling flat roller mill performs thickness hot rolling on the strip steel blank I to obtain a strip steel blank II; a third step: the rough rolling flat roller mill performs thickness hot rolling on the second strip steel blank to obtain a third strip steel blank; a fourth step: and the strip steel blank III enters the rough rolling vertical roller mill II from the inlet of the rough rolling vertical roller mill II and is output from the outlet of the rough rolling vertical roller mill II, but the rough rolling vertical roller mill II does not roll the strip steel blank III, and then the strip steel blank III is conveyed to an outlet roller way. The hot-rolled strip steel rough rolling double-stand rolling process can improve the strip steel yield, the precision of the strip steel and the yield.
Description
Technical Field
The invention relates to the technical field of rolling strip steel in a rough rolling area, in particular to a hot rolling strip steel rough rolling double-rack rolling process.
Background
The hot-rolled strip steel production line is rapidly improved along with the economic development of China in recent years, the consumption level demand of people is continuously improved, and the industries such as civil buildings, automobiles and the like are vigorously developed. The method also puts forward new requirements on the yield and the product precision of the hot rolled strip steel, and enterprises actively seek for product transformation and equipment upgrading in response to market demands, particularly urgent needs for improvement and optimization of production processes. The rough rolling area of the existing hot rolling strip steel production line adopts a reversible single stand machine group consisting of a rough rolling vertical roller mill and a rough rolling flat roller mill to perform reciprocating reversible rolling on strip steel blanks, the rolling mode inevitably comprises a process that the strip steel blanks are rolled by the rough rolling flat roller mill and then enter the rough rolling vertical roller mill for rolling, but due to the influence of the rolling environment of the rough rolling flat roller mill, the head of the strip steel blanks rolled by the rough rolling flat roller mill can generate a head warping or head buckling phenomenon, and the strip steel blanks are extruded by two opposite vertical roller hole grooves during the rolling process of the rough rolling vertical roller mill to perform width rolling on the strip steel blanks, and due to the groove structure of the vertical roller hole grooves, steel stacking accidents can occur when the head warped or head buckled strip steel blanks enter the vertical roller hole grooves, so that the quality of the steel products is poor, and the yield is low. And the reversible single-stand unit rolls for 5 times in a reciprocating way, wherein the rough rolling vertical roller mill rolls the hot-rolled steel billet for 3 times in width, the rough rolling flat roller mill rolls the hot-rolled steel billet for 5 times in thickness, the rolling times in the 5 processes of the reciprocating rolling are more, the rolling capacity is low, and the rolling speed is low.
Disclosure of Invention
In view of the above, the present invention is directed to a hot-rolled strip rough rolling double-stand rolling process, which can improve the yield, quality and yield of the strip steel.
In order to solve the technical problems, the invention adopts the technical scheme that: the hot-rolled strip steel rough rolling double-rack rolling process is provided and is carried out according to the following procedures:
a first step: the method comprises the following steps that an original strip steel blank is conveyed to a first rough rolling edger through an inlet roller way, and the first rough rolling edger performs width hot rolling on the original strip steel blank to obtain a first strip steel blank;
a second step: the rough rolling flat roller mill performs thickness hot rolling on the strip steel blank I to obtain a strip steel blank II;
a third step: the rough rolling flat roller mill performs thickness hot rolling on the second strip steel blank to obtain a third strip steel blank;
a fourth step: the third strip steel blank enters from the inlet of the second rough rolling vertical roller mill and is output from the outlet of the second rough rolling vertical roller mill, but the third strip steel blank of the second rough rolling vertical roller mill is not rolled, and then the third strip steel blank is conveyed to an outlet roller bed;
a fifth step: reversely transporting the three tail parts of the strip steel blanks serving as the front ends to a second rough rolling vertical roller mill through an outlet roller way, and performing width hot rolling on the three strip steel blanks by the two rough rolling vertical roller mills to obtain a fourth strip steel blank;
a sixth step: carrying out thickness hot rolling on the strip steel blank IV by the rough rolling flat roller mill to obtain a strip steel blank V;
a seventh step: the rough rolling flat roller mill performs thickness hot rolling on the strip steel blank V to obtain a strip steel blank VI;
an eighth step: and the strip steel blank six enters from an inlet of the rough rolling edger and is output through an outlet of the rough rolling edger, but the rough rolling edger does not roll the strip steel blank six and then conveys the strip steel blank six to an inlet roller way.
A ninth step: reversely transporting the six tails of the strip steel blanks serving as the front ends to a first rough rolling vertical roller mill through an inlet roller way, and performing width hot rolling on the six strip steel blanks by the first rough rolling vertical roller mill to obtain a seventh strip steel blank;
a tenth step: the rough rolling flat roller mill performs thickness hot rolling on the strip steel blank seven to obtain a strip steel blank eight;
an eleventh step: carrying out thickness hot rolling on the strip steel blank eight by the rough rolling flat roller mill to obtain a strip steel blank nine;
a twelfth step of: and the strip steel blank nine enters from the inlet of the rough rolling vertical roller mill II and is output through the outlet of the rough rolling vertical roller mill II, but the strip steel blank six of the rough rolling vertical roller mill II is not rolled, and then the strip steel blank nine is conveyed to an outlet roller way.
Further, the centering operation is performed by the centering device after the second process and before the third process, the centering operation is performed by the centering device after the sixth process and before the seventh process, and the centering operation is performed by the centering device after the tenth process and before the eleventh process.
Furthermore, in the first procedure, the width of the first strip steel blank is reduced by 15-35mm compared with the width of the original strip steel blank; in the second working procedure, the thickness of the second strip steel blank is reduced by 15 to 35 percent compared with the thickness of the first strip steel blank; in the third working procedure, the thickness of the strip steel blank is reduced by 15 to 35 percent compared with the thickness of the strip steel blank by two; in the fifth procedure, the width of the strip steel blank IV is reduced by 25-45mm compared with the width of the strip steel blank III; in the sixth procedure, the thickness of the strip steel blank five is reduced by 25-45% compared with the thickness of the strip steel blank four; in the seventh procedure, the thickness of the strip steel blank six is reduced by 25-45% compared with the thickness of the strip steel blank five; in the ninth procedure, the width of the strip steel blank seven is reduced by 15-35mm compared with the width of the strip steel blank six; in the tenth working procedure, the thickness of the strip steel blank eight is reduced by 15 to 35 percent compared with the thickness of the strip steel blank seven; in the eleventh procedure, the thickness of the nine-thickness strip steel blank is reduced by 15-35% compared with the eight-thickness strip steel blank.
Further, the rolling time of the first procedure is 3-5 seconds, the rolling time of the second procedure is 2-3 seconds, and the rolling time of the third procedure is 2-3 seconds; the operation time of the fourth procedure is 12-20 seconds; the rolling time of the fifth procedure is 3-5 seconds, the rolling time of the sixth procedure is 2-3 seconds, the rolling time of the seventh procedure is 2-3 seconds, and the operation time of the eighth procedure is 12-20 seconds; the rolling time of the ninth procedure is 3-5 seconds, the rolling time of the tenth procedure is 2-3 seconds, and the rolling time of the eleventh procedure is 2-3 seconds; the operation time of the twelfth procedure is 6-10 seconds.
Further, the temperature of the initial strip steel blank in the first procedure is 1100-.
Furthermore, the centering device comprises a hydraulic cylinder, an upper push rod, a transmission mechanism and a lower pull rod, the hydraulic cylinder is connected with the upper push rod, the lower pull rod is located below the upper push rod in an inclined mode, and the upper push rod and the lower pull rod can be synchronously and symmetrically drawn together and separated through the transmission mechanism.
Further, still include compression roller, bearing roller and guide roll, the compression roller set up in push up rod upper portion, the bearing roller set up in the lower link lower part, the guide roll includes deflector roll and lower deflector roll, go up the deflector roll set up in the push up rod lower part, lower deflector roll set up in the lower link lower part.
The invention has the advantages and positive effects that:
(1) the reversible single-stand unit reciprocating reversible rolling is carried out by two rolling mills consisting of one roughing vertical roller mill and one roughing flat roller mill in the original process, and the reversible single-stand unit reciprocating reversible rolling is changed into the reversible double-stand unit reciprocating reversible rolling by four rolling mills consisting of two roughing vertical roller mills and two roughing flat roller mills, so that the number of the rolling mills is increased, the rolling efficiency is improved, and the yield of steel is increased.
(2) The layout of the process is a first roughing vertical roller mill, a first roughing flat roller mill, a second roughing flat roller mill and a second roughing vertical roller mill which are sequentially arranged, strip steel blanks rolled by the roughing flat roller mill are prevented from entering the roughing vertical roller mill for rolling in the process production process, steel piling accidents caused when warped-head strip steel blanks rolled by the roughing flat roller mill enter a vertical roller hole groove of the roughing vertical roller mill are effectively avoided, the quality and the precision of steel are improved, and the yield is improved by 10% -20%.
(3) The rolling reciprocating rolling times are reduced, and the horizontal rolling passes are increased. For the hot rolling billet with the thickness and width dimension rolled into the strip steel blank with the thickness of 35mm required by a subsequent finishing mill set, the reversible single-stand machine set in the prior art carries out 5 processes of reciprocating production, wherein a rough rolling vertical roller mill rolls the hot rolling billet 3 times in width, and a rough rolling flat roller mill rolls the hot rolling billet 5 times in thickness, while the reversible double-stand machine set carries out 3 processes of reciprocating production, wherein the rough rolling vertical roller mill rolls the hot rolling billet 3 times in width, and the rough rolling flat roller mill rolls the hot rolling billet 6 times in thickness. Namely, the production process of the process is adjusted from the original reversible single-stand unit to the reversible double-stand unit to the reversible single-stand unit to perform reciprocating rolling for 5 times and to perform reciprocating rolling for 3 times. And the rolling times (horizontal rolling passes) of the corresponding rough rolling flat roller mill are adjusted from 5 times to 6 times.
(4) The reduction of the rolling reciprocating times can improve the rolling capacity and the rolling speed of the rough rolling unit, so that the yield of the rough rolling unit is matched with that of the finishing rolling unit. And the reduction of the rolling reciprocating times can reduce the rough rolling temperature drop, thereby reducing the tapping temperature and reducing the gas consumption, and meanwhile, the reduction of the tapping temperature of the heating furnace can prevent the quality reduction or burning waste of the billet caused by the intergranular precipitation of the billet due to overhigh heating temperature. If the temperature control rolling process of the rolled piece is considered, the tapping temperature of the heating furnace can be further reduced. The steel strip structure strength can be about 10% higher than that of the conventional steel strip by controlled temperature rolling.
(5) The horizontal rolling passes of the rough rolling flat rolling are increased, the rolling reduction of each rolling pass can be reduced, the width of the strip steel blank can be better controlled, and the shape of the big end and the big tail of a rolled piece can be better improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the rough rolling process of the hot rolled strip steel in the double-stand rolling process of the invention;
fig. 2 is a schematic view of the structure of the centering device of the present invention.
Description of reference numerals:
1-entrance roller way; 2-rough rolling vertical roller mill I; 3-rough rolling plain-barreled mill I; 4-rough rolling flat roller mill II; 5-rough rolling vertical roller mill II; 6-an outlet roller way; 7-a centering device; 71-hydraulic cylinders; 72-push up rod; 721-transmission side guide middle plate; 73-a transmission; 731-upper rack; 732-a gear shaft; 733-lower rack; 74-lower tie rod; 741-operating side guide middle plate; 75-a press roll; 76-carrying rollers; 77-guide roll; 771-upper guide roller; 772-lower guide rollers.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced items or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In the original strip steel production process, a heated hot-rolled strip steel blank is conveyed to a rough rolling vertical roller mill through an inlet roller way, and the rough rolling vertical roller mill rolls the edge of the hot-rolled strip steel blank so as to adjust the width dimension of the hot-rolled strip steel blank. And the strip steel blank rolled by the rough rolling vertical roller mill reaches a rough rolling flat roller mill, and the rough rolling flat roller mill rolls the hot rolling strip steel blank in the thickness direction so as to adjust the thickness dimension of the hot rolling strip steel blank. And conveying the rolled strip steel blank to an outlet roller way. And then the outlet roller table rotates reversely, the strip steel blank is sent to the rough rolling flat roller mill again, the rough rolling flat roller mill rolls the hot rolled strip steel blank in the thickness direction, the inlet of a rough rolling vertical roller mill in front of the rough rolling flat roller mill is opened, and the rough rolling vertical roller mill does not roll the strip steel blank rolled by the rough rolling flat roller mill in the width direction. At the moment, the strip steel blank is directly transported to the inlet roller way, and the reversible rolling process of a roughing mill set is completed. The thickness and width of the hot-rolled strip steel blank are rolled into a strip steel blank with the thickness of 35mm required by a subsequent finishing mill group, and the production process needs to be repeated according to the description. And the rough rolling vertical roller mill rolls the hot rolled strip steel blank for the last time. And the rough rolling flat roller mill rolls the hot rolled strip steel blank for the second time. Because the hot rolled blank is rolled in a reciprocating way on the single-rack roughing mill group, the rolling time of a roughing area is long, the production rhythm is slow, the productivity of the roughing area on a rolling line is smaller than that of a finishing area, and the whole rolling line cannot be matched. The temperature loss is large in the process of rolling hot strip steel blanks, and particularly the head and tail temperature of the steel strips are reduced greatly. Therefore, the production can not ensure the stable production of the strip steel, and the size precision of the head and the tail can not be ensured. This link directly affects the product extreme and quality so the production process is urgently needed to be solved.
As shown in the figure 1-2, the invention relates to a hot-rolled strip steel rough rolling double-stand rolling process. The process is mainly characterized in that a rough rolling flat roller mill II 4 and a rough rolling vertical roller mill II 5 are added after a rough rolling flat roller mill I3 on the basis of the original production process. The heated original strip steel blank is conveyed to a rough rolling edger 2 through an inlet roller table 1, and the rough rolling edger 2 rolls the edge of the original strip steel blank to adjust the width dimension of the strip steel blank so as to obtain the strip steel blank I. The first strip steel blank rolled by the first rough rolling edger 2 reaches the first rough rolling flat roller 3, and the first rough rolling flat roller 3 rolls the first strip steel blank in the thickness direction to adjust the thickness dimension of the strip steel blank to obtain a second strip steel blank. And the second strip steel blank rolled by the first rough rolling flat roller mill 3 reaches a second rough rolling flat roller mill 4, and the second rough rolling flat roller mill 4 rolls the first strip steel blank in the thickness direction to adjust the thickness dimension of the hot rolling billet to obtain a third strip steel blank.
However, the head bending phenomenon of the strip steel blank rolled by the rough rolling flat roller mill is mainly caused by the following reasons: (1) because the contact environments of the upper surface and the lower surface of the hot-rolled strip steel blank are different, the upper surface of the hot-rolled strip steel blank is naturally radiated by air, the lower surface of the hot-rolled strip steel blank is contacted with a roller way and is conducted and radiated, and the natural radiating rate is less than the conducting and radiating rate, the upper surface steel blank with high temperature and low radiating rate after being rolled by a rough rolling flat roller mill has high extensibility and the lower surface with low temperature and high radiating rate has low extensibility, so that the head of the steel blank. (2) The roller of a rough rolling flat roller mill in a hot rolling strip steel production line is contacted with a blank in the rolling process, the surface of the roller is abraded, the diameter of the roller is changed due to the abrasion of the roller, and the linear speed of the contact position of the surface of the roller and the blank in the rolling process of the roller is changed. Because the grinding degree of the upper and lower rollers is different due to the uncertainty of the surface wear of the rollers, the linear speed is uncertain in the rolling process of the upper and lower rollers, so that the strip steel is bent, the small billet with the diameter of the upper roller is bent upwards, the small billet with the diameter of the lower roller is bent downwards, and the head of the strip steel blank is bent. (3) The rolling mill position on the hot rolling strip steel production line is all equipped with the roll cooling water that prevents equipment damage, and after the strip steel blank passed through rough rolling plain-barreled mill, because the influence of rough rolling plain-barreled mill cooling water also probably makes hot rolling billet surface produce temperature variation and make the billet head crooked from top to bottom. The head of the strip steel blank is warped or buckled, and the groove structure of the vertical roll hole groove in the rough rolling vertical roll mill ensures that the head of the strip steel blank cannot smoothly enter the vertical roll hole groove, so that steel piling accidents are easily caused, and the yield and the quality of materials are reduced. But the tail part of the strip steel blank does not generate the phenomenon of head warping or head buckling (and the reason why the tail part does not generate the phenomenon of head warping or head buckling is supplemented). Therefore, the inlet of the second rough rolling vertical roller 5 after the second rough rolling flat roller 4 is opened, the third strip steel blank enters from the inlet of the second rough rolling vertical roller 5 and is output through the outlet of the second rough rolling vertical roller 5, but the third strip steel blank is not rolled by the second rough rolling vertical roller 5 and is then transported to the outlet roller table 6. And then the outlet roller table 6 rotates reversely to convey the strip steel blank reversely, namely the three tails of the strip steel blank are taken as the front ends to enter the vertical roller hole grooves in the second rough rolling vertical roller mill 5 for width rolling, so that the steel piling accident caused by the strip steel blank head entering the second rough rolling vertical roller mill 5 is avoided.
And rolling the strip steel blank IV by a rough rolling vertical roller mill II 5 to obtain a strip steel blank IV, enabling the strip steel blank IV to reach a rough rolling flat roller mill II 4, and rolling the strip steel blank IV in the thickness direction by the rough rolling flat roller mill II 4 to adjust the thickness dimension of the hot rolling billet to obtain a strip steel blank V. And the strip steel blank five after being rolled by the rough rolling flat roller mill two 4 reaches the rough rolling flat roller mill one 3, and the rough rolling flat roller mill one 3 rolls the strip steel blank five in the thickness direction to adjust the thickness dimension of the hot rolling billet to obtain a strip steel blank six. And the inlet of the first rough rolling edger 2 after the first rough rolling edger 3 is opened, the strip steel blank six enters the first rough rolling edger 2 from the inlet of the first rough rolling edger 2 and is output through the outlet of the first rough rolling edger 2, but the first rough rolling edger 2 does not roll the strip steel blank six and then transports the strip steel blank six to the inlet roller table 1. The strip steel blank is directly transported to the inlet roller table 1, and a back-and-forth rolling process of a rough rolling double-rack unit is completed at the moment. The thickness and the width of the hot rolled steel billet are rolled into the steel billet with the thickness of 35mm required by a subsequent finishing mill group, and the steel billet needs to be rolled for one time by taking the six tail parts of the strip steel billet as the front ends after a back-and-forth rolling process, namely the strip steel billet six is reversely transported to a rough rolling vertical roller mill I2 through an inlet roller table 1, and the rough rolling vertical roller mill I2 carries out width hot rolling on the strip steel billet six to obtain a strip steel billet seven; the rough rolling flat roller mill I3 carries out thickness hot rolling on the strip steel blank seven to obtain a strip steel blank eight; carrying out thickness hot rolling on the strip steel blank eight by a rough rolling flat roller mill II 4 to obtain a strip steel blank nine; and the strip steel blank nine enters from the inlet of the second rough rolling vertical roller mill 5 and is output from the outlet of the second rough rolling vertical roller mill 5, but the second rough rolling vertical roller mill 5 does not roll the strip steel blank six, and then the strip steel blank is conveyed to the outlet roller table 6, and the whole rolling process is completed through the processes. From the above steps, the reversible double-stand unit of the invention performs 3 processes of reciprocating production, wherein the rough rolling vertical roller mill rolls 3 times the width of the hot rolled steel billet, and the rough rolling flat roller mill rolls 6 times the thickness of the hot rolled steel billet, compared with the reversible single-stand unit of the original process, which performs 5 processes of reciprocating production, wherein the rough rolling vertical roller mill rolls 3 times the width of the hot rolled steel billet, and the rough rolling flat roller mill rolls 5 times the thickness of the hot rolled steel billet, the reciprocating rolling times of rolling in the invention are reduced, the horizontal rolling passes are increased, the rolling capacity of the rough rolling unit and the rough rolling speed are improved, so that the yield of the rough rolling unit is improved, and the width of the strip steel billet is better controlled.
In addition, the width of the first strip steel blank in the first procedure is reduced by 15-35mm compared with the width of the original strip steel blank; in the second procedure, the thickness of the second strip steel blank is reduced by 15-35% compared with the thickness of the first strip steel blank; in the third procedure, the thickness of the strip steel blank is reduced by 15-35% compared with the thickness of the strip steel blank; in the fifth procedure, the width of the strip steel blank IV is reduced by 25-45mm compared with the width of the strip steel blank III; in the sixth procedure, the thickness of the strip steel blank five is reduced by 25-45% compared with the thickness of the strip steel blank four; in the seventh procedure, the thickness of the strip steel blank six is reduced by 25-45% compared with the thickness of the strip steel blank five. For a reciprocating process, the width reduction numerical value is expanded from 15-35mm to 25-45mm along with the process sequence, the width reduction amplitude is increased, the thickness reduction numerical value is expanded from 15-35% to 25-45% along with the process sequence, the thickness reduction amplitude is increased, and the width reduction amplitude and the thickness reduction amplitude are gradually increased along with the rolling process, so that the width and thickness precision is effectively ensured. In the ninth procedure, the width of the strip steel blank seventh is reduced by 15-35mm compared with the width of the strip steel blank sixth; in the tenth working procedure, the thickness of the strip steel blank eight is reduced by 15 to 35 percent compared with the thickness of the strip steel blank seven; in the eleventh procedure, the thickness of the nine-thickness strip steel blank is reduced by 15-35% compared with the eight-thickness strip steel blank.
The rolling time of the first procedure is 3-5 seconds, the rolling time of the second procedure is 2-3 seconds, and the rolling time of the third procedure is 2-3 seconds; the operation time of the fourth procedure is 12-20 seconds; the rolling time of the fifth procedure is 3-5 seconds, the rolling time of the sixth procedure is 2-3 seconds, the rolling time of the seventh procedure is 2-3 seconds, and the operation time of the eighth procedure is 12-20 seconds; the rolling time of the ninth procedure is 3-5 seconds, the rolling time of the tenth procedure is 2-3 seconds, and the rolling time of the eleventh procedure is 2-3 seconds; the operation time of the twelfth procedure is 6-10 seconds. The temperature of the initial strip steel blank in the first procedure is 1100-. For the rough rolling process of the hot-rolled strip steel, the rolling time of the vertical roller mill and the flat roller mill is short, and the turning at the outlet roller way and the inlet roller way is relatively time-consuming, so that 4 rolling mills are arranged for hot rolling, the number of times of back-and-forth rolling is reduced, the time consumption of the turning at the outlet roller way and the inlet roller way is effectively reduced, the time of the whole rolling process is shortened, and the rolling efficiency is improved.
In addition, the invention provides a centering device applied to the hot-rolled strip rough rolling double-stand rolling process, namely, the centering device 7 is used for centering after the second process and before the third process, the centering device 7 is used for centering after the sixth process and before the seventh process, and the centering device 7 is used for centering after the tenth process and before the eleventh process. The centering device centers the strip steel blank output by the first rough rolling flat roller mill to prevent the strip steel blank from deviating so that the strip steel blank can smoothly enter the second rough rolling flat roller mill.
Specifically, the centering device 7 includes a hydraulic cylinder 71, an upper push rod 72, a transmission mechanism 73 and a lower pull rod 74, the hydraulic cylinder 71 is connected with the upper push rod 72, the lower pull rod 74 is located obliquely below the upper push rod 72, and the upper push rod 72 and the lower pull rod 74 can be synchronously and symmetrically closed and separated through the transmission mechanism 73. The press roller 75 is arranged on the upper portion of the upper push rod 72, the supporting roller 76 is arranged on the lower portion of the lower pull rod 74, the guiding roller 77 comprises an upper guiding roller 771 and a lower guiding roller 772, the upper guiding roller 771 is arranged on the lower portion of the upper push rod 72, and the lower guiding roller 772 is arranged on the lower portion of the lower pull rod 74.
The transmission device 73 comprises an upper rack 731, a gear shaft 732 and a lower rack 733, wherein the upper rack 731 is fixed at the lower part of the upper push rod 72, the lower rack 733 is fixed at the upper part of the lower pull rod 74, and the upper rack 731 and the lower rack 733 are meshed through the gear shaft 732, so that the two rods can be ensured to synchronously act. The end part of the upper push rod 72 is provided with a transmission side middle plate 721, the end part of the lower pull rod 74 is provided with an operation side middle plate 741, the transmission side middle plate 721 is opposite to the operation side middle plate 741 to form a strip steel blank placing area, and the transmission side middle plate 721 and the operation side middle plate 741 keep relative horizontal movement under the pushing of the upper push rod 72 and the lower pull rod 74. Wear-resisting plates are arranged on the contact surfaces of the transmission side guide middle plate 721 and the operation side guide middle plate 741 and the strip steel blank, so that the service life of the equipment can be prolonged. When the output shaft of the hydraulic cylinder 71 extends, the upper push rod 72 is pushed to move forward, and the lower pull rod 74 is driven to pull backwards through the action of the gear shaft 732, so that the transmission side guide middle plate 721 and the operation side guide middle plate 741 are synchronously and symmetrically close to the rolling center line, and the strip steel blank is squeezed until the strip steel blank is on the symmetrical rolling center line. Conversely, when the output shaft of the hydraulic cylinder 71 retracts, the drive side guide intermediate plate 721 and the operation side guide intermediate plate 741 are opened in synchronization and away from the rolling center line. The press roller 75 prevents the upper push rod 72 from coming off, the upper guide roller 771 is arranged at the lower part to guide the movement of the upper push rod 72, the lower guide roller 772 and the supporting roller 76 are arranged at the lower part of the lower pull rod 74, the lower guide roller 772 guides the lower pull rod 74, and the supporting roller 76 keeps the stable movement of the lower pull rod 74.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The hot-rolled strip steel rough rolling double-rack rolling process is characterized in that: the rough rolling process of the hot rolled strip steel by the double racks comprises the following steps:
a first step: the method comprises the following steps that an original strip steel blank is conveyed to a first rough rolling edger (2) through an inlet roller way (1), and the first rough rolling edger (2) carries out width hot rolling on the original strip steel blank to obtain a first strip steel blank;
a second step: the rough rolling flat roller mill I (3) performs thickness hot rolling on the strip steel blank I to obtain a strip steel blank II;
a third step: the rough rolling flat roller mill II (4) performs thickness hot rolling on the strip steel blank II to obtain a strip steel blank III;
a fourth step: the strip steel blank III enters the rough rolling vertical roller mill II (5) from the inlet of the rough rolling vertical roller mill II (5) and is output through the outlet of the rough rolling vertical roller mill II (5), but the rough rolling vertical roller mill II (5) does not roll the strip steel blank III, and then the strip steel blank III is conveyed to an outlet roller table (6);
a fifth step: reversely transporting the tail of the strip steel blank III serving as the front end to a second rough rolling vertical roller (5) through an outlet roller table (6), and performing width hot rolling on the strip steel blank III by the second rough rolling vertical roller (5) to obtain a strip steel blank IV;
a sixth step: the rough rolling flat roller mill II (4) performs thickness hot rolling on the strip steel blank IV to obtain a strip steel blank V;
a seventh step: carrying out thickness hot rolling on the strip steel blank V by using the rough rolling flat roller mill I (3) to obtain a strip steel blank VI;
an eighth step: and the strip steel blank six enters the rough rolling edger mill one (2) from the inlet of the rough rolling edger mill one (2) and is output through the outlet of the rough rolling edger mill one (2), but the rough rolling edger mill one (2) does not roll the strip steel blank six and then transports the strip steel blank six to the inlet roller table (1).
A ninth step: reversely transporting the six tails of the strip steel blank serving as the front ends to a first rough rolling edger (2) through an inlet roller way (1), and performing width hot rolling on the six strip steel blank by the first rough rolling edger (2) to obtain a seventh strip steel blank;
a tenth step: the rough rolling flat roller mill I (3) performs thickness hot rolling on the strip steel blank seven to obtain a strip steel blank eight;
an eleventh step: carrying out thickness hot rolling on the strip steel blank eight by a rough rolling flat roller mill II (4) to obtain a strip steel blank nine;
a twelfth step of: and the strip steel blank nine enters the rough rolling vertical roller mill II (5) from the inlet of the rough rolling vertical roller mill II (5) and is output through the outlet of the rough rolling vertical roller mill II (5), but the rough rolling vertical roller mill II (5) does not roll the strip steel blank VI, and then the strip steel blank VI is conveyed to the outlet roller table (6).
2. The hot rolled strip roughing mill double stand rolling process as claimed in claim 1, wherein centering is performed by the centering device 7 after the second process and before the third process, centering is performed by the centering device 7 after the sixth process and before the seventh process, and centering is performed by the centering device 7 after the tenth process and before the eleventh process.
3. The rough rolling double-stand rolling process of the hot-rolled strip steel as claimed in claim 2, wherein in the first process, the width of the strip steel blank I is reduced by 15-35mm compared with the width of the original strip steel blank; in the second working procedure, the thickness of the second strip steel blank is reduced by 15 to 35 percent compared with the thickness of the first strip steel blank; in the third working procedure, the thickness of the strip steel blank is reduced by 15 to 35 percent compared with the thickness of the strip steel blank by two; in the fifth procedure, the width of the strip steel blank IV is reduced by 25-45mm compared with the width of the strip steel blank III; in the sixth working procedure, the thickness of the strip steel blank five is reduced by 25-45% compared with the thickness of the strip steel blank four; in the seventh procedure, the thickness of the strip steel blank six is reduced by 25-45% compared with the thickness of the strip steel blank five; in the ninth procedure, the width of the strip steel blank seven is reduced by 15-35mm compared with the width of the strip steel blank six; in the tenth working procedure, the thickness of the strip steel blank eight is reduced by 15 to 35 percent compared with the thickness of the strip steel blank seven; in the eleventh procedure, the thickness of the nine-thickness strip steel blank is reduced by 15-35% compared with the eight-thickness strip steel blank.
4. The rough rolling double-stand rolling process of the hot-rolled strip steel as claimed in claim 3, wherein the rolling time of the first process is 3-5 seconds, the rolling time of the second process is 2-3 seconds, and the rolling time of the third process is 2-3 seconds; the operation time of the fourth procedure is 12-20 seconds; the rolling time of the fifth procedure is 3-5 seconds, the rolling time of the sixth procedure is 2-3 seconds, the rolling time of the seventh procedure is 2-3 seconds, and the operation time of the eighth procedure is 12-20 seconds; the rolling time of the ninth procedure is 3-5 seconds, the rolling time of the tenth procedure is 2-3 seconds, and the rolling time of the eleventh procedure is 2-3 seconds; the operation time of the twelfth procedure is 6-10 seconds.
5. The rough rolling process of the hot rolled strip steel by the double stands as claimed in claim 4, wherein the temperature of the original strip steel blank in the first step is 1100-.
6. The centering device applied to the hot-rolled strip roughing double-stand rolling process of the claims 1 to 5 is characterized in that the centering device (7) comprises a hydraulic cylinder (71), an upper push rod (72), a transmission mechanism (73) and a lower pull rod (74), the hydraulic cylinder (71) is connected with the upper push rod (72), the lower pull rod (74) is located on the oblique lower side of the upper push rod (72), and the upper push rod (72) and the lower pull rod (74) can be synchronously and symmetrically closed and separated through the transmission mechanism (73).
7. The hot-rolled strip roughing double-stand rolling process as claimed in claim 6, further comprising a press roll (75), a supporting roller (76) and a guiding roll (77), wherein the press roll (75) is disposed on the upper portion of the upper push rod (72), the supporting roller (76) is disposed on the lower portion of the lower pull rod (74), the guiding roll (77) comprises an upper guide roll (771) and a lower guide roll (772), the upper guide roll (771) is disposed on the lower portion of the upper push rod (72), and the lower guide roll (772) is disposed on the lower portion of the lower pull rod (74).
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| CN202010042113.3A CN111215449A (en) | 2020-01-15 | 2020-01-15 | Hot-rolled strip steel rough rolling double-rack rolling process |
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| CN202010042113.3A CN111215449A (en) | 2020-01-15 | 2020-01-15 | Hot-rolled strip steel rough rolling double-rack rolling process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114769310A (en) * | 2022-02-28 | 2022-07-22 | 鞍钢股份有限公司 | Double-stand symmetrical reciprocating hot continuous rolling roughing mill and rolling method |
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2020
- 2020-01-15 CN CN202010042113.3A patent/CN111215449A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114769310A (en) * | 2022-02-28 | 2022-07-22 | 鞍钢股份有限公司 | Double-stand symmetrical reciprocating hot continuous rolling roughing mill and rolling method |
| CN114769310B (en) * | 2022-02-28 | 2024-05-14 | 鞍钢股份有限公司 | Double-frame symmetrical reciprocating hot continuous rolling roughing mill and rolling method |
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