CN109821901B - Variable-step-pitch head-tail width control method for fixed-width machine - Google Patents
Variable-step-pitch head-tail width control method for fixed-width machine Download PDFInfo
- Publication number
- CN109821901B CN109821901B CN201910093266.8A CN201910093266A CN109821901B CN 109821901 B CN109821901 B CN 109821901B CN 201910093266 A CN201910093266 A CN 201910093266A CN 109821901 B CN109821901 B CN 109821901B
- Authority
- CN
- China
- Prior art keywords
- width
- step pitch
- head
- machine
- fixing machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention provides a variable-step-pitch head-tail width control method for a fixed-width machine, which comprises the following steps: when the head of the plate blank enters the width fixing machine, setting the step pitch of the width fixing machine by utilizing a first change rule, wherein the first change rule is that the step pitch of the width fixing machine is increased along with the roll gap stage of the head of the plate blank; when the middle part of the plate blank enters the width fixing machine, fixing the width of the head part of the plate blank by using the width fixing machine, wherein the second change rule is that the step pitch is not changed; when the tail part of the plate blank enters the width fixing machine, the step pitch of the width fixing machine is set according to a third change rule, and the third change rule is that the step pitch is gradually decreased in multiple stages; the variable mirror surfaces of the first and third variation rules at each stage correspond to each other. The method has the advantages that the step pitch of the sizing machine is controlled in a layered mode, the problems that the hardness level is high, the width of the steel is reduced greatly, and the width of the steel is not widened due to the fact that metal at the head and the tail end is not bound are solved, the width control precision of the sizing machine is effectively improved, and the product yield is improved.
Description
Technical Field
The invention relates to the technical field of rough rolling of hot rolled strip steel, in particular to a variable-step-pitch head-tail width control method for a width fixing machine.
Background
The hot rolling width control mainly depends on a width fixing machine and a vertical roll, and the width fixing machine has the characteristics that: the width adjusting capability is strong, but the width control precision is low, and the width adjusting range is 0-350 mm; the vertical roll has the characteristics that: the width adjusting capability is weak, but the width control precision is high, and the width adjusting range is 0-50 mm. The precision research of hot rolling width control equipment discovers that the head and the tail of the intermediate billet have the phenomenon of width loss after the plate blank is struck by a width fixing machine, and the phenomenon of width loss of the head and the tail becomes more obvious along with the increase of the width reduction amount; when the head and the tail lose width seriously, the vertical roller can not be adjusted and eliminated through a short stroke, so that the head and the tail of a finished product are ultra wide, the requirement of a customer can not be met, and the yield is influenced.
However, the applicant of the present invention finds that the prior art has at least the following technical problems:
the technical problem that the head and tail widths of steel grades with large width reducing amount and high hardness level cannot be effectively controlled in the prior art is solved.
Disclosure of Invention
The embodiment of the invention provides a variable-step-pitch head-tail width control method for a fixed-width machine, which solves the technical problem that the head-tail width of a steel grade with large width reduction amount and high hardness level cannot be effectively controlled in the prior art.
In view of the above problem, the present invention provides a method for controlling head and tail width of a fixed width machine with variable step pitch, comprising: when the head of the plate blank enters a width fixing machine, setting the step pitch of the width fixing machine by utilizing a first change rule, and fixing the width of the head of the plate blank by utilizing the width fixing machine, wherein the first change rule is a rule that the step pitch of the width fixing machine is gradually increased along with the increasing of the roll gap stage of the head of the plate blank; when the middle part of the plate blank enters the width fixing machine, setting the step pitch of the width fixing machine by using a second change rule, and fixing the width of the head part of the plate blank by using the width fixing machine, wherein the second change rule is a rule that the step pitch is kept unchanged; when the tail of the plate blank enters the width fixing machine, setting the step pitch of the width fixing machine by using a third change rule, and fixing the width of the head of the plate blank by using the width fixing machine, wherein the third change rule is a rule that the step pitch of the width fixing machine is decreased with the decrease of the roll gap stage of the tail of the plate blank; and the step pitch variation of the first variation rule corresponds to the variation mirror of the step pitch in the third variation rule.
Preferably, the slab head is divided into a plurality of stages according to the roll gap, and at least comprises: a head primary roll gap, a head secondary roll gap and a head tertiary roll gap; the step pitch of the width fixing machine is set by utilizing a first change rule, and the method specifically comprises the following steps: setting the step pitch of the width fixing machine to be a first step pitch P1 according to the head primary roll gap; setting the step pitch of the sizing machine to be a second step pitch P2 according to the head secondary roll gap; setting the step pitch of the width fixing machine to be a third step pitch P3 according to the head three-time roll gap; setting the step pitch of each stage in the width fixing machine to be P3 not less than P2 not less than P1 by utilizing the first change rule, wherein the P1, the P2 and the P3 are all 0-500 mm.
Preferably, when the middle portion of the slab enters the width fixing machine, the step pitch of the width fixing machine is set by using a second change rule, and the width fixing machine is used for fixing the width of the head portion of the slab, and the method includes: when the middle part of the plate blank enters the width fixing machine, the step pitch of the width fixing machine is set to be a fourth step pitch P4 by utilizing a second change rule, wherein the P4 is more than 0 and less than 500mm, and P4 is more than or equal to P3 and more than or equal to P2 and more than or equal to P1.
Preferably, the tail of the slab is divided into a plurality of stages according to the roll gap, and the tail of the slab at least comprises: a tail third roll gap, a tail secondary roll gap and a tail primary roll gap; when the tail of the slab enters the width fixing machine, the step pitch of the width fixing machine is set according to a third change rule, and the method comprises the following steps: setting the step pitch of the width fixing machine to be a fifth step pitch P3 'according to the tail three-time roll gap, and P3' is P3; setting the step pitch of the width fixing machine to be a sixth step pitch P2 'according to the tail secondary roll gap, and setting P2' to be P2; setting the step pitch of the width fixing machine to be P1 'according to the tail primary roll gap, wherein P1' is P1; and setting the step pitch of each stage in the width fixing machine to be P3 '≧ P2' ≧ P1 ', and setting the P1', P2 'and P3' to be 0-500mm by utilizing the third change rule.
Preferably, the method further comprises: and obtaining the width reduction amount of the plate blank, and setting a step distance threshold value of the width fixing machine according to the width reduction amount, wherein the step distances set in the first change rule, the second change rule and the third change rule all meet the step distance threshold value.
Preferably, the width reducing amount of the width fixing machine is 0-350 mm.
Preferably, the larger the width reducing amount is, the smaller the step pitch of the width fixing machine is.
Preferably, the width of the slab is 600-.
Preferably, the length of the striking segment of the constant width machine in each stage of the head primary roll gap, the head secondary roll gap and the head tertiary roll gap is respectively L1, L2 and L3; wherein, the L1, the L2 and the L3 are 0-5000 mm.
Preferably, the striking segment lengths of the constant width machine in each stage of the tail primary roll gap, the tail secondary roll gap and the tail tertiary roll gap are respectively L5, L6 and L7; wherein, the L5, the L6 and the L7 are 0-5000 mm.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
according to the variable-step head-tail width control method of the fixed-width machine, when the head of a plate blank enters the fixed-width machine, the step pitch of the fixed-width machine is set by using a first change rule, the head of the plate blank is fixed by using the fixed-width machine, the first change rule is a rule that the step pitch of the fixed-width machine is increased along with the increasing of the roll gap stage of the head of the plate blank, and the small step pitch is adopted for striking at the head end of the plate blank, so that the width of the head end is prevented from being widened due to the fact that metal flows at the end of the plate blank are not bound, and the step pitch is gradually increased along with the entering of the plate blank; when the middle part of the plate blank enters the width fixing machine, setting the step pitch of the width fixing machine by using a second change rule, and fixing the width of the head part of the plate blank by using the width fixing machine, wherein the second change rule is a rule that the step pitch is kept unchanged, and at the moment, as the problem that the end part of the middle part of the plate blank is not bound does not exist, a uniform large step pitch is selected for striking and rolling, the rolling time is shortened, and the temperature reduction of the plate blank is avoided; when the tail of the plate blank enters the width fixing machine, setting the step pitch of the width fixing machine by using a third change rule, and fixing the width of the head of the plate blank by using the width fixing machine, wherein the third change rule is a rule that the step pitch of the width fixing machine is decreased with the decrease of the roll gap stage of the tail of the plate blank; wherein the stride variation volume of first change law with the variation mirror surface of stride corresponds in the third change law, along with getting into slab tail end, the stride of sizing machine reduces gradually, adopts little stride when carrying out tail end strike rolling, avoids metal flow to afterbody end department, causes the afterbody width to lose width, and influences product quality to realized through sizing machine stride layered control, carry out the stride control, effectively improve sizing machine width control accuracy, avoid head, afterbody metal to cause the tip width to lose the width to appear to the tip flow, influence product yield, and then solved among the prior art to reducing the width greatly, the higher steel grade of hardness level, failed to carry out the technical problem of effective control to head, tail width.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Fig. 1 is a schematic flow chart of a variable-step-pitch head-tail width control method of a fixed-width machine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the step change of the width fixing machine according to the embodiment of the present invention;
FIG. 3 is a schematic diagram of a striking sequence of a conventional fixed width machine;
FIG. 4 is a schematic diagram of a striking timing sequence of the width setter of the present invention;
FIG. 5 is a diagram illustrating a variation trend of the main transmission current in the second embodiment of the present invention;
FIG. 6 is a graph showing the variation of the moving speed of the slab in the second embodiment of the present invention;
fig. 7 is a width curve diagram of the plate blank after being hit by the fixed width machine in the second embodiment of the invention.
Description of reference numerals: a width fixing machine 1 and a slab 2.
Detailed Description
The embodiment of the invention provides a variable-step-pitch head-tail width control method for a fixed-width machine, which is used for solving the technical problem that the head-tail width of a steel grade with large width reduction amount and high hardness level cannot be effectively controlled in the prior art.
The technical scheme provided by the invention has the following general idea:
when the head of the plate blank enters a width fixing machine, setting the step pitch of the width fixing machine by utilizing a first change rule, and fixing the width of the head of the plate blank by utilizing the width fixing machine, wherein the first change rule is a rule that the step pitch of the width fixing machine is gradually increased along with the increasing of the roll gap stage of the head of the plate blank; when the middle part of the plate blank enters the width fixing machine, setting the step pitch of the width fixing machine by using a second change rule, and fixing the width of the head part of the plate blank by using the width fixing machine, wherein the second change rule is a rule that the step pitch is kept unchanged; when the tail of the plate blank enters the width fixing machine, setting the step pitch of the width fixing machine by using a third change rule, and fixing the width of the head of the plate blank by using the width fixing machine, wherein the third change rule is a rule that the step pitch of the width fixing machine is decreased with the decrease of the roll gap stage of the tail of the plate blank; and the step pitch variation of the first variation rule corresponds to the variation mirror of the step pitch in the third variation rule. The method has the advantages that the step pitch of the sizing machine is controlled in a layering mode through optimization, the problems that steel grades are high in hardness level and large in width reduction amount, and width is lost due to the fact that metal at the head and tail ends is not bound are solved, the width control precision of the sizing machine is effectively improved, and the product yield is improved.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Fig. 1 is a schematic flow chart of a variable-step-pitch head-tail width control method of a fixed-width machine in the embodiment of the invention. The embodiment of the present invention provides a method for controlling head and tail width of a fixed width machine with variable step pitch, please refer to fig. 1-4, the method includes:
step 10: when the head of the slab enters the width fixing machine 1, setting the step pitch of the width fixing machine 1 by using a first change rule, and fixing the width of the head of the slab 2 by using the width fixing machine 1, wherein the first change rule is a rule that the step pitch of the width fixing machine 1 is gradually increased in multiple stages along with the increasing of the roll gap stage of the head of the slab 2.
Further, the slab head is divided into a plurality of stages according to the roll gap, and at least comprises: a head primary roll gap, a head secondary roll gap and a head tertiary roll gap; the step pitch of the width fixing machine is set by utilizing a first change rule, and the method specifically comprises the following steps: setting the step pitch of the width fixing machine to be a first step pitch P1 according to the head primary roll gap; setting the step pitch of the sizing machine to be a second step pitch P2 according to the head secondary roll gap; setting the step pitch of the width fixing machine to be a third step pitch P3 according to the head three-time roll gap; setting the step pitch of each stage in the width fixing machine to be P3 not less than P2 not less than P1 by utilizing the first change rule, wherein the P1, the P2 and the P3 are all 0-500 mm.
Further, the method further comprises: and obtaining the width reduction amount of the plate blank, and setting a step distance threshold value of the width fixing machine according to the width reduction amount, wherein the step distances set in the first change rule, the second change rule and the third change rule all meet the step distance threshold value. .
Further, the width reducing amount of the width fixing machine 1 is 0-350 mm.
Further, when the width reduction amount is larger, the step pitch of the width fixing machine 1 is smaller.
Specifically, for steel grades with high hardness levels, when the width reduction amount is large, metal flows towards the head and the tail of the plate blank 2 due to no constraint at the head and the tail of the plate blank 2, the conventionally used fixed width machine 1 and other steps are set in the side pressure process, the metal easily causes the width loss of the head and the tail of the plate blank 2, and the width loss trend becomes more serious along with the increase of the width reduction amount, the embodiment of the invention carries out the step-variable setting of the fixed width machine 1 in order to avoid the problem that the width of the head and the tail of the plate blank 2 cannot be effectively controlled to cause the width loss of the head and the tail, when the head of the plate blank 2 is beaten and rolled, the step-down setting of the step of the fixed width machine 1 is adopted, the smaller step P1 is used at the end, because the end is not constrained, when the step is large, the beating surface is large, the force is easy to cause the metal to flow towards the end, the head and the tail of the plate blank 2 is caused, the moving speed of the plate blank is slow, the striking force is small, the plate blank is slowly widened, the width precision of the plate blank is controlled, the problem that metal flows to the end part is solved, small steps cannot be used for rolling all the time, the pure rolling time is long, the temperature is reduced, the quality of the plate blank is prevented from being affected by the widening condition, and therefore a mode of gradually increasing is selected, as shown in fig. 2, the steps are increased to P2 at the position of a head secondary roll gap, the steps are increased to P3 at the position of a head tertiary roll gap, and the like, the width fixing machine 1 is provided with three steps or more steps, and can be divided into five stages for part of machine types. Meanwhile, the setting of the step pitch of each stage is related to the hardness and the width reduction amount of the steel grade of the plate blank 2, if the hardness and the width reduction amount of the plate blank 2 are larger, the step pitch can be selected to be set in a smaller mode, and the step pitch is difficult to reduce due to the fact that the hardness is larger, and the step pitch is gradually reduced. . In the steel type having a large step width, since the metal of the end portion of the slab 2 is not bound, and when the step width is large, the metal of the striking portion tends to flow to the end portion, it is necessary to control the step width in layers in accordance with the step width of the width setter 1. Calculating the width reduction amount of an original slab 2 according to the width of the slab, the target width of the slab 2 to be processed, the temperature, parameters of a width fixing machine 1 and other physical quantities, wherein the width fixing machine 1 performs width fixing striking rolling according to the width reduction amount to roll the original slab 2 to the target width, the conventional method is that the width fixing machine 1 performs striking rolling by adopting uniform steps, the maximum step is usually selected to set the width reduction amount so as to ensure the rolling time and the problem of rough rolling cooling, the head end and the tail end of the slab 2 are easy to form the problems of width loss, width loss and the like due to no constraint, the larger the probability of the width reduction amount is, therefore, the steps of the width fixing machine 1 are controlled in a layered mode according to the width reduction amount of the slab 2, the problems of width loss, width loss and the like due to no constraint of the head end and the tail end of the slab 2 are avoided, and simultaneously, the steel type with the larger width reduction amount is reduced, if the maximum step pitch is used for striking, main transmission overcurrent alarm can be caused, and the problem of main transmission tripping scrap steel can be caused in serious cases, so that the embodiment of the invention selects to carry out hierarchical control on the step pitch of the width fixing machine aiming at the width reduction quantity. Empirically, the relationship between the amount of width reduction and the step pitch is shown in table 1 below, and when the step pitch requirement of the slab 2 is determined based on the amount of width reduction, the step pitch is set according to the change rule of the head, the middle and the tail within the range satisfying the step pitch requirement.
For example, a siemens width setter 1 is adopted in a steel plant a, the maximum step pitch of a hammer head is designed to be 428mm, the step pitch of steel type APSKEY is set, when the hardness K value of the steel type ranges from 0 to 6, step pitch layering is performed according to the following table 1, and when the hardness K value of the steel type ranges from 7 to 8, the step pitch layering is set by adopting a level with a correspondingly reduced width. It should be noted that the hardness K value in this example is the hardness division of a steel works, not as a general index, and the basic principle is: a small step pitch is selected for setting a high-hardness slab, so that the condition of width loss is avoided, the yield of the slab is prevented from being influenced, and the slab can be correspondingly adjusted according to different requirements of different production lines and different conditions of steel hardness.
TABLE 1
The step pitch of a width fixing machine 1 of the traditional method is uniformly set to be 428mm at the maximum, metal is easily caused to flow to the end part of the width fixing machine for the end part, so that the head and the tail of a plate blank are subjected to width losing, the layering setting is carried out according to the embodiment of the invention, when the K value of a steel grade is 0-6, the width reducing amount is within 150mm, and the step pitch is set to be 428 mm; when the width reduction amount is 150-250mm, the step pitch is set to be 300 mm; when the width reduction amount is 250-300mm, the step pitch is set to be 200 mm; when the width reduction amount is 300-350mm, the step pitch is set to 100 mm. If the k value of the steel grade is 7-8, namely the steel grade with high hardness grade, when the width reduction amount is less than 250mm, the step pitch should be 200mm which is smaller by one grade; when the width reduction amount is 250mm and 300mm, the step pitch is 100 mm. The step setting is carried out by combining the hardness and the width reduction amount of the steel type of the plate blank, so that the problem that the head of the plate blank is not wide due to the metal flow at the end part of the plate blank is solved, meanwhile, the embodiment of the invention further optimizes the position of the plate blank entering the fixed width machine 1 and starting to roll, the main transmission is started after the plate blank 2 is loaded by the working roll at the inlet of the traditional fixed width machine 1 in the striking time sequence, and the plate blank 2 carries out start-stop action, and as the position of the loading position of the working roll is a certain distance M away from the actual striking position of the hammer head of the fixed width machine 1 to strike the plate blank 2, as shown in figure 3, the idle striking condition exists after the main transmission is started, and meanwhile, the pure rolling time of the fixed width machine. In the embodiment of the invention, after the striking time sequence of the width fixing machine 1 is optimized at the striking position, when the plate blank 2 moves to the position m before the parallel section of the hammer head of the width fixing machine 1, as shown in fig. 4, the main transmission is started, at the moment, the plate blank 2 performs the start-stop action, and when the hammer head of the width fixing machine 1 strikes, the plate blank 2 enters the striking position, so that the idle striking condition is avoided, and the striking time sequence of the width fixing machine 1 is optimized.
Step 20: when the middle part of the slab 2 enters the width fixing machine 1, the step pitch of the width fixing machine 1 is set by using a second change rule, the head of the slab 2 is fixed by using the width fixing machine 1, and the second change rule is a rule that the step pitch is kept unchanged.
Further, when the middle portion of the slab 2 enters the width fixing machine 1, setting the step pitch of the width fixing machine 1 by using a second change rule, and fixing the width of the head portion of the slab 2 by using the width fixing machine 1 includes: when the middle part of the plate blank enters the width fixing machine 1, the step pitch of the width fixing machine 1 is set to be a fourth step pitch P4 by utilizing a second change rule, wherein the P4 is more than 0 and less than 500mm, and P4 is more than or equal to P3 and more than or equal to P2 and more than or equal to P1.
Further, the striking length of the fixed width machine 1 in each stage of the head primary roll gap, the head secondary roll gap and the head tertiary roll gap is respectively L1, L2 and L3; wherein, the L1, the L2 and the L3 are 0-5000 mm.
Further, the striking segment lengths of the fixed width machine 1 in each stage of the tail primary roll gap, the tail secondary roll gap and the tail tertiary roll gap are respectively L5, L6 and L7; wherein, the L5, the L6 and the L7 are 0-5000 mm.
Further, the width of the slab 2 is 600-2250 mm.
Particularly, as for the middle part of the plate blank 2, the problem that the end part is not bound does not exist, the maximum step pitch within the step pitch threshold range is uniformly adopted for rolling, the pure rolling time is ensured, the rough rolling temperature is prevented from being reduced, meanwhile, the rolling efficiency is ensured by combining the step pitch reduction amount control, and as for the steel type with larger reduction amount, under the large step pitch striking mode, the main transmission overcurrent alarm often occurs, and the condition that the main transmission trips to scrap steel is also caused seriously, the step pitch limitation is carried out according to the step pitch reduction amount, the problem of the main transmission overcurrent alarm can be effectively avoided, the smoothness of the rolling process is ensured, and the influence on the yield of the plate blank is avoided. The length of the middle part is a longer part, the length L of the plate blank 2 rolled in the width fixing machine 1 ranges from 4800-12000mm, the width of the plate blank 2 ranges from 600-2250mm, the length of the head step striking sections L1, L2 and L3 ranges from 0mm to 5000mm, the length of the tail step striking sections L5, L6 and L7 ranges from 0mm to 5000mm, the striking section L4 of the middle part of the plate blank is L- (L1+ L2+ L3+ L5+ L6+ L7) except the head step striking sections and the tail step striking sections.
Step 30: when the tail of the slab 2 enters the width fixing machine 1, setting the step pitch of the width fixing machine 1 by using a third change rule, and fixing the width of the head of the slab 2 by using the width fixing machine 1, wherein the third change rule is a rule that the step pitch of the width fixing machine 1 is decreased with the decrease of the roll gap stage at the tail of the slab 2; and the step pitch variation of the first variation rule corresponds to the variation mirror of the step pitch in the third variation rule.
Further, the tail of the slab is divided into multiple stages according to the roll gap, and the tail of the slab at least comprises: a tail third roll gap, a tail secondary roll gap and a tail primary roll gap; when the tail of the slab enters the width fixing machine, the step pitch of the width fixing machine is set according to a third change rule, and the method comprises the following steps: setting the step pitch of the width fixing machine to be a fifth step pitch P3 'according to the tail three-time roll gap, and P3' is P3; setting the step pitch of the width fixing machine to be a sixth step pitch P2 'according to the tail secondary roll gap, and setting P2' to be P2; setting the step pitch of the width fixing machine to be P1 'according to the tail primary roll gap, wherein P1' is P1; and setting the step pitch of each stage in the width fixing machine to be P3 '≧ P2' ≧ P1 ', and setting the P1', P2 'and P3' to be 0-500mm by utilizing the third change rule.
Specifically, when the striking rolling is performed on the tail portion of the slab 2, the head portion is the same, if the striking rolling is performed on the tail portion of the slab continuously using the step setting size of the middle portion of the slab 2, the metal flows to the end portion due to the large step, and the tail portion is not bound, so that the tail portion is widened, the tail portion of the slab 2 is processed by using the step setting method which is the same as the step setting method of the head portion of the slab 2, that is, the step layering setting is adopted, the step of the tail portion is set to be recently reduced, the step corresponding to the step of the head portion of the slab 1 is set to be mirror-surface, as shown in fig. 2, the tail portion of the slab 2 enters the third roll gap, then the second roll gap, and finally the tail portion is the first roll gap, when the tail portion enters the third roll gap, the step of the fixed width machine 1 is P3, and when the tail portion enters the second roll gap, the step pitch of the sizing machine 1 is reduced to P2, when the last roll gap is formed, the step pitch is P1, striking is carried out at the tail part by adopting small step pitch, and the phenomenon that the tail part width is not wide due to metal flowing at the tail part of a plate blank is effectively avoided. By optimizing the step pitch layered control of the width fixing machine 1 and developing the step pitch control function, the problem that the width of steel with high hardness level and large width reduction quantity is not widened due to the fact that metal at the head and tail ends is not bound is solved, the width control precision of the width fixing machine is effectively improved, and the technical effect of improving the product yield is achieved.
Example two
In order to better describe the technical characteristics and the application of the variable-step-pitch head-tail width control method of the sizing machine of the invention, the application of the invention will be described in detail with reference to specific embodiments, please refer to fig. 5-7.
The embodiment of the invention relates to the specific use condition of a hot rolling mill using the variable-step-pitch head-tail width control method of the fixed-width mill, and the pipeline steel X80 with higher hardness grade and larger width reduction amount is selected for testing, and the test amount is 20 blocks. Raw material specification: 230 × 1650 × 10000, specification of finished product: 22 × 1450mm, the theoretical width reduction amount of the fixed width machine 1 is 200mm, the actual width reduction amount is 245mm, the step pitch of the fixed width machine 1 is set to be P1-100 mm, P2-P3-200 mm, P4-300 mm, and L1-L2-L3-600 mm; as shown in fig. 5-6, the width control precision of the plate blank 2 is effectively improved by the width control function with variable step pitch of the fixed width machine 1 from the actual field test condition, as shown in fig. 7, the width curve trend graph after the plate blank 2 is hit is shown, 20 test plate blanks 2 are actually measured on the field, and the width deviation of the plate blank 2 in the length direction is smaller than 4mm, compared with the width deviation of 25mm when the head and tail width control method with variable step pitch of the fixed width machine of the embodiment of the invention is not used, the test proves that the width control precision of the fixed width machine is effectively improved and the product yield is improved by optimizing the step pitch hierarchical control and variable step pitch control function of the fixed width machine, so that the problem of width loss caused by high hardness grade, large reduced width amount of steel and no constraint of head and tail end metal is solved.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
according to the variable-step head-tail width control method of the fixed-width machine, when the head of a plate blank enters the fixed-width machine, the step pitch of the fixed-width machine is set by using a first change rule, the head of the plate blank is fixed by using the fixed-width machine, the first change rule is a rule that the step pitch of the fixed-width machine is increased along with the increasing of the roll gap stage of the head of the plate blank, and the small step pitch is adopted for striking at the head end of the plate blank, so that the width of the head end is prevented from being widened due to the fact that metal flows at the end of the plate blank are not bound, and the step pitch is gradually increased along with the entering of the plate blank; when the middle part of the plate blank enters the width fixing machine, setting the step pitch of the width fixing machine by using a second change rule, and fixing the width of the head part of the plate blank by using the width fixing machine, wherein the second change rule is a rule that the step pitch is kept unchanged, and at the moment, as the problem that the end part of the middle part of the plate blank is not bound does not exist, a uniform large step pitch is selected for striking and rolling, the rolling time is shortened, and the temperature reduction of the plate blank is avoided; when the tail of the plate blank enters the width fixing machine, setting the step pitch of the width fixing machine by using a third change rule, and fixing the width of the head of the plate blank by using the width fixing machine, wherein the third change rule is a rule that the step pitch of the width fixing machine is decreased with the decrease of the roll gap stage of the tail of the plate blank; wherein the stride variation volume of first change law with the variation mirror surface of stride corresponds in the third change law, along with getting into slab tail end, the stride of sizing machine reduces gradually, adopts little stride when carrying out tail end strike rolling, avoids metal flow to afterbody end department, causes the afterbody width to lose width, and influences product quality to realized through sizing machine stride layered control, carry out the stride control, effectively improve sizing machine width control accuracy, avoid head, afterbody metal to cause the tip width to lose the width to appear to the tip flow, influence product yield, and then solved among the prior art to reducing the width greatly, the higher steel grade of hardness level, failed to carry out the technical problem of effective control to head, tail width.
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 modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments 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 encompass such modifications and variations.
Claims (8)
1. A variable-step head-tail width control method for a fixed-width machine is characterized by comprising the following steps:
when the head of the plate blank enters a width fixing machine, setting the step pitch of the width fixing machine by utilizing a first change rule, and fixing the width of the head of the plate blank by utilizing the width fixing machine, wherein the first change rule is a rule that the step pitch of the width fixing machine is gradually increased along with the increasing of the roll gap stage of the head of the plate blank;
when the middle part of the plate blank enters the width fixing machine, setting the step pitch of the width fixing machine by using a second change rule, and fixing the width of the head part of the plate blank by using the width fixing machine, wherein the second change rule is a rule that the step pitch is kept unchanged;
when the tail of the plate blank enters the width fixing machine, setting the step pitch of the width fixing machine by using a third change rule, and fixing the width of the head of the plate blank by using the width fixing machine, wherein the third change rule is a rule that the step pitch of the width fixing machine is decreased with the decrease of the roll gap stage of the tail of the plate blank; the step pitch variation of the first variation rule corresponds to the step pitch variation mirror in the third variation rule;
the slab head is divided into a plurality of stages according to the roll gap, and at least comprises: a head primary roll gap, a head secondary roll gap and a head tertiary roll gap; the step pitch of the width fixing machine is set by utilizing a first change rule, and the method specifically comprises the following steps:
setting the step pitch of the width fixing machine to be a first step pitch P1 according to the head primary roll gap;
setting the step pitch of the sizing machine to be a second step pitch P2 according to the head secondary roll gap;
setting the step pitch of the width fixing machine to be a third step pitch P3 according to the head three-time roll gap;
setting the step pitch of each stage in the width fixing machine by utilizing the first change rule as follows: p3 is more than or equal to P2 and more than or equal to P1, and P1, P2 and P3 are all 0-500 mm;
wherein, when the intermediate portion of slab gets into when the sizing machine, utilize the second to change the law and set for the step pitch of sizing machine, and utilize the sizing machine is right the slab head carries out the sizing and utilizes the second to change the law and set for the step pitch of sizing machine, and utilize the sizing machine is right the slab head carries out the sizing, the second changes the law and keeps unchangeable law for the step pitch, includes:
when the middle part of the plate blank enters the width fixing machine, setting the step pitch of the width fixing machine to be a fourth step pitch P4 by utilizing a second change rule, wherein the P4 is more than 0 and less than 500mm, and P4 is more than or equal to P3 and more than or equal to P2 and more than or equal to P1;
wherein the step size of each stage is set according to the hardness and the width reduction of the steel grade of the plate blank.
2. The method according to claim 1, characterized in that the tail of the slab is divided into a plurality of stages according to the roll gap, comprising at least: a tail third roll gap, a tail secondary roll gap and a tail primary roll gap; when the tail of the slab enters the width fixing machine, the step pitch of the width fixing machine is set according to a third change rule, and the method comprises the following steps:
setting the step pitch of the width fixing machine to be a fifth step pitch P3 'according to the tail three-time roll gap, and P3' is P3;
setting the step pitch of the width fixing machine to be a sixth step pitch P2 'according to the tail secondary roll gap, and setting P2' to be P2;
setting the step pitch of the width fixing machine to be a seventh step pitch P1 'according to the tail primary roll gap, and setting P1' to be P1;
setting the step pitch of each stage in the width fixing machine by utilizing the third change rule as follows: p3 'is not less than P2' is not less than P1 ', P1', P2 'and P3' are all 0-500 mm.
3. The method of claim 1, wherein the method further comprises:
and obtaining the width reduction amount of the plate blank, and setting a step distance threshold value of the width fixing machine according to the width reduction amount, wherein the step distances set in the first change rule, the second change rule and the third change rule all meet the step distance threshold value.
4. The method of claim 3, wherein the amount of width reduction is 0-350 mm.
5. The method of claim 3, wherein the step size of the deckle is reduced as the amount of the width reduction is increased.
6. The method as claimed in claim 1, wherein the width of the slab is 600-2250 mm.
7. The method of claim 1, wherein the length of the fixed-width machine striking segment at each stage of the head primary roll gap, the head secondary roll gap and the head tertiary roll gap is L1, L2 and L3 respectively; wherein, the L1, the L2 and the L3 are 0-5000 mm.
8. The method of claim 3, wherein the length of the striking segment of the fixed width machine at each stage of the tail primary roll gap, the tail secondary roll gap and the tail tertiary roll gap is L5, L6 and L7 respectively; wherein, the L5, the L6 and the L7 are 0-5000 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910093266.8A CN109821901B (en) | 2019-01-30 | 2019-01-30 | Variable-step-pitch head-tail width control method for fixed-width machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910093266.8A CN109821901B (en) | 2019-01-30 | 2019-01-30 | Variable-step-pitch head-tail width control method for fixed-width machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109821901A CN109821901A (en) | 2019-05-31 |
| CN109821901B true CN109821901B (en) | 2021-06-22 |
Family
ID=66863077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910093266.8A Active CN109821901B (en) | 2019-01-30 | 2019-01-30 | Variable-step-pitch head-tail width control method for fixed-width machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109821901B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113083908B (en) * | 2021-03-31 | 2022-11-22 | 北京首钢股份有限公司 | Method and device for controlling width of hot-rolled width-adjusted blank |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11342411A (en) * | 1998-05-29 | 1999-12-14 | Nkk Corp | Plate width control for thick steel plate |
| CN102989784A (en) * | 2012-12-07 | 2013-03-27 | 北京金自天正智能控制股份有限公司 | Fixed-width press plate blank width control method |
| CN103042043A (en) * | 2013-01-17 | 2013-04-17 | 山西太钢不锈钢股份有限公司 | Method for controlling strip steel head and tail widths through coil box production process |
| CN103386419A (en) * | 2013-07-15 | 2013-11-13 | 莱芜钢铁集团有限公司 | Method for controlling head-to-tail width of high broadening ratio steel plate |
| CN104324948A (en) * | 2014-11-06 | 2015-02-04 | 东北大学 | Method for controlling width of rolled piece in rough rolling process of hot continuous rolling |
| CN106734239A (en) * | 2016-12-14 | 2017-05-31 | 北京首钢股份有限公司 | Base head and tail width control method and device and constant width machine in the middle of a kind of constant width machine |
| CN107175260A (en) * | 2016-03-11 | 2017-09-19 | 宝山钢铁股份有限公司 | Wedge-shaped base width control method based on fixed-width side press |
| CN110038905A (en) * | 2018-01-15 | 2019-07-23 | 宝山钢铁股份有限公司 | A kind of variable step control method that roughing constant width machine is predicted based on slab head and tail width |
-
2019
- 2019-01-30 CN CN201910093266.8A patent/CN109821901B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11342411A (en) * | 1998-05-29 | 1999-12-14 | Nkk Corp | Plate width control for thick steel plate |
| CN102989784A (en) * | 2012-12-07 | 2013-03-27 | 北京金自天正智能控制股份有限公司 | Fixed-width press plate blank width control method |
| CN103042043A (en) * | 2013-01-17 | 2013-04-17 | 山西太钢不锈钢股份有限公司 | Method for controlling strip steel head and tail widths through coil box production process |
| CN103386419A (en) * | 2013-07-15 | 2013-11-13 | 莱芜钢铁集团有限公司 | Method for controlling head-to-tail width of high broadening ratio steel plate |
| CN104324948A (en) * | 2014-11-06 | 2015-02-04 | 东北大学 | Method for controlling width of rolled piece in rough rolling process of hot continuous rolling |
| CN107175260A (en) * | 2016-03-11 | 2017-09-19 | 宝山钢铁股份有限公司 | Wedge-shaped base width control method based on fixed-width side press |
| CN106734239A (en) * | 2016-12-14 | 2017-05-31 | 北京首钢股份有限公司 | Base head and tail width control method and device and constant width machine in the middle of a kind of constant width machine |
| CN110038905A (en) * | 2018-01-15 | 2019-07-23 | 宝山钢铁股份有限公司 | A kind of variable step control method that roughing constant width machine is predicted based on slab head and tail width |
Non-Patent Citations (2)
| Title |
|---|
| 2250mm热连轧板带宽度控制优化;胡健;《中国冶金》;20140330;第24卷(第3期);2-3 * |
| 定宽机在2250mm热轧生产线的应用;张明生;《轧钢》;20171230;第34卷(第6期);80-82 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109821901A (en) | 2019-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101912874B (en) | Production method of preventing from coiling and pulling narrow of hot-rolled low carbon strip steels used for cold-rolled base plates | |
| CN109821901B (en) | Variable-step-pitch head-tail width control method for fixed-width machine | |
| CN104148404A (en) | Hot rolled strip flatness automatic control method | |
| CN109926453A (en) | The method for determining Reversible Single Stand Cold Rolling Mill lifting speed rolling efficiency coefficient | |
| CN103949481A (en) | Flatness subsection control method considering both rolling stability and quality of hot rolling band steel | |
| CN106311762B (en) | Improve the load distribution method of hot rolled thin strip rolling stability | |
| CN103464472A (en) | Tension variable control method for improving full-length width uniformity of thin-specification hot-rolled stainless steel | |
| CN112958633A (en) | Incoming material camber-based fine rolling strip steel head pre-swing leveling control method | |
| CN102189112B (en) | Hot-rolled cross-rolling roll shifting method for sequence changing of drawing steel | |
| JP5141839B2 (en) | T-section steel manufacturing method and rolling equipment | |
| CN109365542B (en) | Method for calculating abrasion of rough rolling vertical roll | |
| CN114769325B (en) | Control method for hot continuous rolling CVC working roll shifting | |
| JP4986463B2 (en) | Shape control method in cold rolling | |
| JP5347912B2 (en) | Thick steel plate manufacturing method | |
| CN114951304A (en) | Roll bending force setting method for cold continuous rolling strip steel head plate shape defect | |
| CN114653755B (en) | Cold rolling mill working roll, roll forming method and UCM cold rolling mill | |
| KR100951269B1 (en) | Flatness control method using fine pass rolling | |
| KR101050792B1 (en) | Cooling Control Method Using Dynamic Reset | |
| RU2813726C1 (en) | Method of producing strip of variable thickness and strip of variable thickness | |
| CN114472530B (en) | Cold rolling mill working roll, roll forming method and UCMW cold rolling mill | |
| CN114589205B (en) | Method for determining online roll changing time node in strip rolling process | |
| JP2004090079A (en) | Edge drop controller for rolling mill | |
| CN114453426A (en) | Method for adjusting rough rolling center line | |
| RU2787897C1 (en) | Method for rolling tramway grooved rails | |
| JP7235014B2 (en) | Hat-shaped steel sheet pile manufacturing method and manufacturing equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |