CN110014040B - Steel rolling roll changing model - Google Patents
Steel rolling roll changing model Download PDFInfo
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- CN110014040B CN110014040B CN201910239214.7A CN201910239214A CN110014040B CN 110014040 B CN110014040 B CN 110014040B CN 201910239214 A CN201910239214 A CN 201910239214A CN 110014040 B CN110014040 B CN 110014040B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The invention discloses a steel rolling roll changing model, which comprises the following steps: step (ii) ofA. Neglecting the broadening in the cold continuous rolling process; b, setting through a second level and uploading to a third-level PES system; step C, l5The length of the finished product at the outlet of the acid rolling mill is measured to obtain the length of the finished product; step D, obtaining the rolling kilometers of each frame in the on-machine time period by the roller; the rolling kilometers of the 1# to 4# frames are calculated by researching and analyzing the relation between the rolling kilometers of the 1# to 5# frame working rolls and using the rolling kilometers of the 5# frame and the reduction ratios of the frames as calculation factors, so that reasonable and accurate kilometers are obtained. The invention can solve the problems of roll change basis loss and inaccurate partial data caused by the defects of the roll change model in the existing industrial automation.
Description
Technical Field
The invention relates to the technical field of cold-rolled strip steel manufacturing, in particular to a mathematical model for controlling roll changing during steel rolling.
Background
The production process flow of the cold-rolled steel strip generally comprises hot coiling, feeding and uncoiling, welding, acid washing, rolling, coiling, bundling, annealing, leveling, recoiling and oiling, coiling and packaging in sequence. The roll of the steel coil needs to be replaced when the steel passing amount of the roll in the rolling process reaches a certain amount, and the commonly used industrial automation (PES) roll replacement control is to track the steel passing amount of the roll and realize roll replacement according to the rolling kilometer number as a roll replacement basis.
PES is used by cold rolling plants of the enterprise from 2016 to 12 months, and the following problems exist:
the 1# -3# frame working roll takes the rolling tonnage as the roll change basis; the working rolls of the No. 4 and No. 5 frames adopt rolling kilometers as the basis of roll replacement, wherein the rolling kilometer number of the No. 5 frame is equal to the sum of the lengths of finished products of a steel coil rolled by the rolls at an acid rolling outlet in the machine time period, and the rolling kilometer number of the No. 4 frame is equal to the rolling kilometer number of the No. 5 frame multiplied by a fixed coefficient of 0.95. The first-level roll consumes rolling kilometer number information, a first-level system rolling kilometer number calculation formula takes a 1# rack as an example, the current linear speed of a working roll of the 1# rack is v (mpm), 10ms scanning is performed once, the kilometer number of each scanning period is S = v/60, the rolling kilometer number S =sigmas in a working roll single-time startup and shutdown time period, and the first-level data cannot be transmitted to the second level, and the second-level data cannot be transmitted to a third-level PES system, so the rolling kilometer number of the 1# to 3# rack cannot be used as a roll change basis all the time.
Taking 1250mm pickling continuous rolling mill as an example, the frame numbers of the roll information 1# -5# of PES are 301, 302, 303, 304 and 305 respectively, and the rolling kilometers corresponding to each frame in the time period of one time of loading and unloading of the working roll are calculated as follows: 1# (301), 2# (302), and 3# (303) working rolls of the frame work roll system kilometers: are equal to the kilometers of the working rolls of the No. 5 frame. 4# (304) the kilometer made by the working rolls of the frame is equal to 5# (305) the kilometer made by the working rolls of the frame is multiplied by 0.95; the kilometer number of the working roll of the No. 5 frame is equal to the sum of the lengths of the acid-rolled finished products corresponding to rolled steel rolls in the on-machine time period; therefore, the rolling kilometer number of the roller in the PES system is only 5# (305) accurate, and the others are not accurate.
In addition, the thickness of the steel coil is 0.20 mm-2.5 mm, and the thickness of the cold rolling raw material hot rolling coil is 2.0 mm-4.8 mm. Due to different rolling specifications, the difference of the rolling kilometers of different specifications is larger by adopting the rolling tonnage as the roll change basis. Thus, the roll change model of PES needs to be modified.
Disclosure of Invention
The invention aims to solve the problem that the roll changing model for steel rolling is provided to solve the problems of roll changing basis loss and inaccurate partial data caused by the defects of the roll changing model in the existing industrial automation.
In order to solve the problems, the technical scheme of the invention is as follows: the steel rolling roll changing model comprises the following steps:
step A, neglecting the broadening in the cold continuous rolling process,
firstly, the principle that the flow in seconds is equal in the continuous rolling process is used for obtaining: b isi×hi×Vhi=Bi+1×hi+1×Vh（i+1）；
Neglecting the broadening, the unit time is given by: h isi×li= hi+1×li+1；
③ according to the process h of continuous rollingi+1=Hi，li+1=Li；
H is got fromi×li=Hi×Li；
The volume law can also be obtained: h isi×li=Hi×Li；
L is obtained fromi=hi×li/HiWherein i =1,2,3,4, 5;
is provided with an absolute reduction of epsiloniThen H isi=hi/（1-εi) Wherein i =1,2,3,4, 5;
the formula is: l isi=li×（1-εi) Wherein i =1,2,3,4, 5;
ninthly, kinematic conditions of continuous rolling: vhi=VH(i+1)In unit time,/i=Li+1，i=1,2,3,4；
In the same way,. li-1=LiWherein i =2,3,4, 5;
the red is represented by the formula (ninu):
li-1=li×（1-εi) Wherein i =2,3,4,5,
li=li+1×（1-εi+1) Wherein i =1,2,3, 4;
step B, ε1、ε2、ε3、ε4、ε5The data are uploaded to a three-level PES system through two-level setting;
step C, l5The length of the finished product at the outlet of the acid rolling mill is measured to obtain:
l4=l5×（1-ε5），
l3=l4×（1-ε4）= l5×（1-ε5）×（1-ε4），
l2=l3×（1-ε3）= l5×（1-ε5）×（1-ε4）×（1-ε3），
l1=l2×（1-ε2）= l5×（1-ε5）×（1-ε4）×（1-ε3）×（1-ε2），
and D, in the on-machine time period of the roller, the calculation formula of the rolling kilometers of each rack is as follows:
rolling kilometers S on a stand1=
l1Wherein l is1=l5×（1-ε5）×（1-ε4）×（1-ε3）×（1-ε2）；
Two-stand rolling kilometers2=
l2Wherein l is2=l5×（1-ε5）×（1-ε4）×（1-ε3）；
Rolled kilometers S with three stands3=
l3Wherein l is3=l5×（1-ε5）×（1-ε4）；
Rolling kilometers S with four stands4=
l4Wherein l is4=l5×（1-ε5）；
Rolling kilometers S with five stands5=
l5Wherein l is5The length of the acid-rolled finished product of each coil of steel in the rolling time is defined as the rolling time;
wherein: h is the inlet thickness of the frame, H is the outlet thickness, VHIs the inlet velocity, VhIs the exit velocity, B is the exit width, L is the entrance length, L is the exit length, HiTo represent the entry thickness of the ith stand product, hiTo represent exit thickness, V, of the ith stand productHiInlet velocity, V, for ith rack producthiOutlet velocity of ith rack product, BiFor ith rack product width, LiEntry length, l, for ith frame productiIs the exit length of the ith rack product.
In the above technical solution, a more specific solution may be: and (3) comparing and correcting the theoretical length of the outlet material and the actual length of the outlet material:
outlet material actual length = outlet actual weight × 109(material thickness x material width x 7.85), wherein the material thickness is the thickness obtained by two-stage measurement, the material width is the order width +20mm, and the outlet actual weight is obtained by actually weighing the outlet area of the continuous rolling mill;
outlet material theoretical length = outlet real weight × 109(material thickness x material width x 7.85), wherein the material thickness is the order thickness, the material width is the order width +20mm, and the outlet actual weight is obtained by actual weighing of the outlet area of the continuous rolling mill;
when the actual length of the outlet material is less than or equal to 1.01 multiplied by the theoretical length of the outlet material, the number of kilometers of the five-stand rolling mill is l5= actual length of outlet material;
when the actual length of the outlet material is more than 1.01 multiplied by the theoretical length of the outlet material, the number of kilometers rolled by the five stands is l5= theoretical length of outlet material;
wherein: the length is in mm and the weight is in t.
Further: the data is set as 1.01 as the source of the basis, the proportion of the negative tolerance value in the thickness is set as 0.01 as the boundary, the width extension is neglected in the continuous rolling process, the proportion of the thickness reduction amount is equal to the proportion of the length increase, namely the length can be considered to be increased by 0.01 time for the longest length; when the measured actual length is larger than 1.01 times of the theoretical length, the measured actual length is considered to be unreliable; and when the measured actual length is less than or equal to 1.01 times of the theoretical length, the measured actual length is considered to be credible.
Further: establishing early warning setting of rolling kilometers: the method comprises the steps of setting a roller-changing rolling kilometer requirement of each rack, setting the roller-changing rolling kilometer = a target value +/-a floating value of the roller-changing rolling kilometer, setting the target value of the rolling kilometer as an early warning rolling kilometer, and displaying the early warning rolling kilometer in red when the rolling kilometer reaches the target value of the rolling kilometer.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the steel rolling roll change model analyzes the relation between the rolling kilometers of the working rolls of the 1# to 5# frames through research, and calculates the rolling kilometers of the 1# to 4# frames by using the rolling kilometers of the 5# frames and the reduction ratios of the frames as calculation factors to obtain reasonable and accurate kilometers;
2. the steel rolling roll changing model is used for researching l transmitted to a three-level PES system in a second-level uploading mode5The accuracy of (2). Tracking finds that when the thickness tracking measurement is abnormal, measured l5The difference between the value and the actual length is far, and the difference of the part can reach hundreds of times, so that the relative accuracy of the data acquired by the three-level PES system is ensured by adopting a method of comparing and correcting the outlet material theoretical length and the outlet material actual length;
3. according to the steel rolling roll changing model, the data is set to be 1.01 as a source of basis, and the proportion distribution of the negative tolerance value in the thickness from 1 month in 2018 to 10 months in 2018 is counted as follows: 0.004, 0.006, 0.005, 0.004, 0.005, 0.001, 0.005, 0.002, 0.003, 0.005, the proportion of the negative tolerance value to the thickness is set with 0.01 as a limit; neglecting the widening in the continuous rolling process, the ratio of the thickness reduction amount is equal to the ratio of the length increase, namely, the length can be considered to be increased by 0.01 times at the longest. When the measured actual length is more than 1.01 times of the theoretical length, the measured actual length (the actual length of the outlet material) is considered to be unreliable; when the measured actual length is less than or equal to 1.01 times of the theoretical length, the measured actual length (the actual length of the outlet material) is considered to be credible;
4. according to the steel rolling roll change model, through establishing early warning setting of rolling kilometers, the requirement of roll change rolling kilometers of each rack is made, the roll change rolling kilometers = target value +/-floating value of the roll change rolling kilometers, the target value of the rolling kilometers is set as the early warning rolling kilometers, when the rolling kilometers reach the target value of the rolling kilometers, the early warning rolling kilometers display red, roll change work is reminded, and rolls are changed as required;
the steel rolling roll change model effectively solves the problem that the 1# to 5# rack working rolls all use rolling kilometers as the roll change basis, avoids the potential safety hazard of roll use caused by roll change using rolling tonnage, improves the scientificity of roll change period, and is deeper in the aspect of industrialization and informatization integration.
Detailed Description
The following examples are provided for further details of the invention:
the roll changing model of the rolled steel uses a willow cold rolling 1250mm pickling continuous rolling mill group as the following:
i, material number L2181016605100, theoretical length of outlet material is 3839973mm, actual length of outlet material is 3830959mm, actual length of outlet material/theoretical length of outlet material =1.00, then L5=3.831 km. Epsilon1、ε2、ε3、ε4、ε50.3165, 0.351, 0.2975,0.2468 and 0.07 respectively, then
l4=l5×（1-ε5) =3.831 × (1-0.07) =3.5628 km;
l3=l5×（1-ε5）×（1-ε4) =3.831 × (1-0.07) × (1-0.2468) =2.6835 km;
l2=l5×（1-ε5）×（1-ε4）×（1-ε3) =3.831 × (1-0.07) × (1-0.2468) × (1-0.2975) =1.8852 km;
l1=l5×（1-ε5）×（1-ε4）×（1-ε3）×（1-ε2）=3.831×（1-0.07) × (1-0.2468) × (1-0.2975) × (1-0.351) =1.2235 km;
II, material number L2181016605200, theoretical length of outlet material 3836643mm, actual length of outlet material 3959624mm, actual length of outlet material/theoretical length of outlet material =1.03, then L5=3.8366 km.
ε1、ε2、ε3、ε4、ε50.3165, 0.351, 0.2975,0.2468 and 0.07 respectively, then
l4=l5×（1-ε5) =3.8366 × (1-0.07) =3.5681 km;
l3=l5×（1-ε5）×（1-ε4) =3.8366 × (1-0.07) × (1-0.2468) =2.6875 km;
l2=l5×（1-ε5）×（1-ε4）×（1-ε3) =3.8366 × (1-0.07) × (1-0.2468) × (1-0.2975) =1.888 km;
l1=l5×（1-ε5）×（1-ε4）×（1-ε3）×（1-ε2) =3.8366 × (1-0.07) × (1-0.2468) × (1-0.2975) × (1-0.351) =1.2253 km;
thirdly, assuming that target rolling kilometer values of the rolling kilometers of the No. 1 to No. 5 frames of the 1250mm pickling continuous rolling mill set are S respectively1 target、S2 object、S3 object、S4 target、S5 targetThe rolling kilometer number floating value is S1 float、S2 float、S3 float、S4 float、S5 float(ii) a The actual rolling kilometer counts are respectively S1PES、S2PES、S3PES、S4PES、S5PES(ii) a For the 1# frame work roll, when S1PES=S1 targetWhen the system is started to warn, when S is started1PES∈[S1 target-S1 float，S1 target+S1 float]In the process, the roller can be replaced; for the 2# frame work roll, when S2PES=S2 objectWhen the system is started to warn, when S is started2PES∈[S2 object-S2 float，S2 object+S2 float]In the process, the roller can be replaced; for the 3# frame work roll, when S3PES=S3 objectWhen the system is started to warn, when S is started3PES∈[S3 object-S3 float，S3 object+S3 float]In the process, the roller can be replaced; for the 4# frame work roll, when S4PES=S4 targetWhen the system is started to warn, when S is started4PES∈ [S4 target-S4 float，S4 target+S4 float]In the process, the roller can be replaced; for the 5# frame work roll, when S5PES=S5 targetWhen the system is started to warn, when S is started5PES∈ [S5 target-S5 float，S5 target+S5 float]In this case, the rolls can be changed.
The proportion distribution of the negative tolerance value in the thickness from 1 month in 2018 to 10 months in 2018 is counted as follows: 0.004, 0.006, 0.005, 0.004, 0.005, 0.001, 0.005, 0.002, 0.003, 0.005, the proportion of the negative tolerance value to the thickness is set with 0.01 as a limit; neglecting the widening in the continuous rolling process, the ratio of the thickness reduction amount is equal to the ratio of the length increase, namely, the length can be considered to be increased by 0.01 times at the longest. When the measured actual length is more than 1.01 times of the theoretical length, the measured actual length (the actual length of the outlet material) is considered to be unreliable; when the measured actual length is 1.01 times or less the theoretical length, the measured actual length (outlet material actual length) is considered to be reliable.
The steel rolling roll change model effectively solves the problem that the 1# to 5# rack working rolls all use rolling kilometers as the roll change basis, avoids the potential safety hazard of roll use caused by roll change using rolling tonnage, improves the scientificity of roll change period, and is deeper in the aspect of industrialization and informatization integration.
Claims (5)
1. A steel rolling roll change model is characterized by comprising the following steps:
step A, neglecting the broadening in the cold continuous rolling process,
firstly, the principle of equal second flow in the continuous rolling process is used to obtain：Bi×hi×Vhi=Bi+1×hi+1×Vh（i+1）；
Neglecting the broadening, the unit time is given by: h isi×li= hi+1×li+1；
③ according to the process h of continuous rollingi+1=Hi，li+1=Li；
H is got fromi×li=Hi×Li；
The volume law can also be obtained: h isi×li=Hi×Li；
L is obtained fromi=hi×li/HiWherein i =1,2,3,4, 5;
is provided with an absolute reduction of epsiloniThen H isi=hi/（1-εi) Wherein i =1,2,3,4, 5;
the formula is: l isi=li×（1-εi) Wherein i =1,2,3,4, 5;
ninthly, kinematic conditions of continuous rolling: vhi=VH(i+1)In unit time,/i=Li+1，i=1,2,3,4；
In the same way,. li-1=LiWherein i =2,3,4, 5;
the red is represented by the formula (ninu):
li-1=li×（1-εi) Wherein i =2,3,4,5,
li=li+1×（1-εi+1) Wherein i =1,2,3, 4;
step B, ε1、ε2、ε3、ε4、ε5The data are uploaded to a three-level PES system through two-level setting;
step C, l5The length of the finished product at the outlet of the acid rolling mill is measured to obtain:
l4=l5×（1-ε5），
l3=l4×（1-ε4）= l5×（1-ε5）×（1-ε4），
l2=l3×（1-ε3）= l5×（1-ε5）×（1-ε4）×（1-ε3），
l1=l2×（1-ε2）= l5×（1-ε5）×（1-ε4）×（1-ε3）×（1-ε2），
and D, in the on-machine time period of the roller, the calculation formula of the rolling kilometers of each rack is as follows:
rolling kilometers S on a stand1=
l1Wherein l is1=l5×（1-ε5）×（1-ε4）×（1-ε3）×（1-ε2）；
Two-stand rolling kilometers2=
l2Wherein l is2=l5×（1-ε5）×（1-ε4）×（1-ε3）；
Rolled kilometers S with three stands3=
l3Wherein l is3=l5×（1-ε5）×（1-ε4）；
Rolling kilometers S with four stands4=
l4Wherein l is4=l5×（1-ε5）；
Rolling kilometers S with five stands5=
l5Wherein l is5The length of the acid-rolled finished product of each coil of steel in the rolling time is defined as the rolling time;
wherein: h is the inlet thickness of the frame, H is the outlet thickness, VHIs the inlet velocity, VhIs the exit velocity, B is the exit width, L is the entrance length, L is the exit length, HiTo represent the entry thickness of the ith stand product, hiTo represent exit thickness, V, of the ith stand productHiInlet velocity, V, for ith rack producthiOutlet velocity of ith rack product, BiFor ith rack product width, LiEntry length, l, for ith frame productiIs the exit length of the ith rack product.
2. The steel rolling roll change model according to claim 1, wherein: and (3) comparing and correcting the theoretical length of the outlet material and the actual length of the outlet material:
outlet material actual length = outlet actual weight × 109(material thickness x material width x 7.85), wherein the material thickness is the thickness obtained by two-stage measurement, the material width is the order width +20mm, and the outlet actual weight is obtained by actually weighing the outlet area of the continuous rolling mill;
outlet material theoretical length = outlet real weight × 109(material thickness x material width x 7.85), wherein the material thickness is the order thickness, the material width is the order width +20mm, and the outlet actual weight is obtained by actual weighing of the outlet area of the continuous rolling mill;
when the actual length of the outlet material is less than or equal to 1.01 multiplied by the theoretical length of the outlet material, the number of kilometers of the five-stand rolling mill is l5= actual length of outlet material;
when the actual length of the outlet material is more than 1.01 multiplied by the theoretical length of the outlet material, the number of kilometers rolled by the five stands is l5= theoretical length of outlet material;
wherein: the length is in mm and the weight is in t.
3. The steel rolling roll change model according to claim 1 or 2, wherein: the data is set as 1.01 as the source of the basis, the proportion of the negative tolerance value in the thickness is set as 0.01 as the boundary, the width extension is neglected in the continuous rolling process, the proportion of the thickness reduction amount is equal to the proportion of the length increase, namely the length can be considered to be increased by 0.01 time for the longest length; when the measured actual length is larger than 1.01 times of the theoretical length, the measured actual length is considered to be unreliable; and when the measured actual length is less than or equal to 1.01 times of the theoretical length, the measured actual length is considered to be credible.
4. The steel rolling roll change model according to claim 1 or 2, wherein: establishing early warning setting of rolling kilometers: the method comprises the steps of setting a roller-changing rolling kilometer requirement of each rack, setting the roller-changing rolling kilometer = a target value +/-a floating value of the roller-changing rolling kilometer, setting the target value of the rolling kilometer as an early warning rolling kilometer, and displaying the early warning rolling kilometer in red when the rolling kilometer reaches the target value of the rolling kilometer.
5. The steel rolling roll change model according to claim 3, wherein: establishing early warning setting of rolling kilometers: the method comprises the steps of setting a roller-changing rolling kilometer requirement of each rack, setting the roller-changing rolling kilometer = a target value +/-a floating value of the roller-changing rolling kilometer, setting the target value of the rolling kilometer as an early warning rolling kilometer, and displaying the early warning rolling kilometer in red when the rolling kilometer reaches the target value of the rolling kilometer.
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