CN111558615A - Method for controlling finish rolling pressure of titanium plate on hot continuous rolling line - Google Patents
Method for controlling finish rolling pressure of titanium plate on hot continuous rolling line Download PDFInfo
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- CN111558615A CN111558615A CN202010420379.7A CN202010420379A CN111558615A CN 111558615 A CN111558615 A CN 111558615A CN 202010420379 A CN202010420379 A CN 202010420379A CN 111558615 A CN111558615 A CN 111558615A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- 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
- B21B1/24—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 continuous or semi-continuous process
- B21B1/26—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 continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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Abstract
The invention belongs to the technical field of metallurgical steel rolling of metallurgical science and technology, and relates to a method for controlling the finish rolling pressure of a titanium plate on a hot continuous rolling line, which comprises the following steps: predicting the hardness of each finish rolling stand according to the sum of the rough rolling pressure; determining a pressure correction coefficient; calculating the reduction rate of the finish rolling rack; and calculating the rolling pressure of each frame of the finishing mill. The rolling precision of the method for controlling the finish rolling pressure of the titanium plate on the hot continuous rolling line completely meets the rolling requirement of the titanium plate: the pressure deviation of each stand of the finish rolling is less than 10 percent, the thickness deviation is within +/-0.15 mm, the rolling stability among the stands is good, and no rolling line waste products caused by the speciality of the titanium plate variety are generated.
Description
Technical Field
The invention belongs to the technical field of metallurgical steel rolling in metallurgical science and technology, and relates to a method for controlling the finish rolling pressure of a titanium plate on a hot continuous rolling line.
Background
The hot continuous rolling process is a way of producing steel, and generally takes a continuous casting slab or a bloom slab as a raw material. The slab is first heated in a heating furnace to a target temperature at a temperature specified by the process. The slab is then descaled by high pressure water and then fed into a roughing mill, typically with roughing vertical rolls controlling the width and flat rolls controlling the thickness. And rolling the strip steel by the rough rolling unit to enable the strip steel to reach preset target thickness, width and temperature, and then enabling the strip steel to enter the finishing rolling unit for continuous rolling to enable the strip steel to reach the preset target thickness and temperature. And finally, forming the strip steel into a steel coil through a coiling machine.
Due to market demands and processing demands for improving the quality of the titanium plate, the titanium plate provided by Baotian corporation is required to be rolled on the Tai steel hot continuous rolling strip steel production line, and the titanium plate blank is rolled into the required final thickness and width requirements. All equipment and control of the tai-steel hot continuous rolling 1549 production line (figure 1) are designed for rolling strip steel, and no special equipment and control system for titanium plates are provided. Under the condition of consistent specifications, the titanium plate is rolled according to a fixed roll gap basically in rough rolling, so the titanium plate can be rolled normally in rough rolling, but in the continuous rolling process of a seven-stand finish rolling, if model calculation is inaccurate, the titanium plate cannot normally penetrate in finish rolling, rolling line waste products are generated, and the rolling of the titanium plate in finish rolling cannot be finished. In the calculation of the finish rolling model, the most basic calculation is the calculation of the rolling pressure, if the problem of the control accuracy of the rolling pressure of the titanium plate at each stand for finish rolling is solved, other control parameters can be solved on the basis of the rolling pressure, and when the titanium plate is rolled at each stand for finish rolling on a hot continuous rolling production line, compared with the rolling of strip steel, the following problems are mainly solved when the rolling pressure is controlled:
(1) the titanium plate can not provide chemical components required to be provided during strip steel rolling, the hardness of the titanium plate can not be tested, the hardness of each machine frame at each temperature is the most key basic link of finish rolling pressure calculation, and a method for determining the hardness of the titanium plate must be established independently.
(2) The temperature of the titanium plate cannot be measured in a hot continuous rolling production line, and the temperature cannot be tested and calculated in the finish rolling pressure hardness calculation.
(3) The width of the titanium plate cannot be measured on the hot continuous rolling line, so that the actual width of the rough rolling outlet cannot participate in the calculation of the finish rolling specification.
Disclosure of Invention
The invention provides a method for controlling the finish rolling pressure of a titanium plate on a hot continuous rolling line, which aims to solve the problem of how to control the finish rolling pressure of titanium plate varieties under the condition of no chemical components, temperature and width measurement values in hot continuous rolling.
Specifically, the method for controlling the finish rolling pressure of the titanium plate on the hot continuous rolling line comprises the following steps: predicting the hardness of each finish rolling stand according to the sum of the rough rolling pressure; determining a pressure correction coefficient; calculating the reduction rate of the finish rolling rack; and calculating the rolling pressure of each frame of the finishing mill.
The technical scheme of the invention has the following beneficial effects:
(1) the rolling precision of the method for controlling the finish rolling pressure of the titanium plate on the hot continuous rolling line completely meets the rolling requirement of the titanium plate: the pressure deviation of each stand of the finish rolling is less than 10 percent, the thickness deviation is within +/-0.15 mm, the rolling stability among the stands is good, and no rolling line waste products caused by the speciality of the titanium plate variety are generated.
(2) The method for controlling the finish rolling pressure of the titanium plate on the hot continuous rolling line has great economic benefit, and specifically comprises the following steps: the titanium plate has the benefit of 1000 yuan per ton, and can produce about 5000 tons per year, so that the annual benefit can be generated: 1000 yuan/ton 5000 ton 500 ten thousand yuan.
(3) The method for controlling the finish rolling pressure of the titanium plate on the hot continuous rolling line predicts the finish rolling pressure according to the actual pressure of the last pass of rough rolling, and solves the problem of how to control the finish rolling pressure under the condition of continuous rolling in a finish rolling area.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
Fig. 1 is a schematic view of the equipment layout of a tai-steel 1549 hot continuous rolling line.
Description of the symbols: the 1 is a heating furnace, comprising 4 heating furnaces and 1 trolley furnace; 2 is a high-pressure water descaling box; 3 is a rough rolling vertical roller mill (VE 0); 4 is a rough rolling flat roller mill (R0); 5 is a heat preservation cover; 6, drum type crop flying shears; 7 are finish rolling machine frames (7 additional frames); 8 is a convexity meter; 9 is a width gauge; 10 is a thickness gauge; 11 is a flatness meter; 12 is a coiling machine.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
The method for calculating the finish rolling pressure adopted in the prior strip steel rolling comprises the following steps:
F(I)＝NNFKORR(I)×MH(I)×EPS(I) (1)
wherein I represents the number of the finishing mill frame;
f (I) is the I stand rolling pressure, KN;
NNFKORR (I) is the I frame pressure correction factor;
MH (I) is a hardness value, KN, the hardness value can be tested according to the standard GB/T231-. The hardness refers to Brinell Hardness (HB);
EPS (I) is the screw-down rate of the I frame,%.
1) Method for determining depressing rate EPS (I) of frame I
According to the thickness of the strip steel at the inlet and the outlet of the finishing mill frame, the reduction rate of each finishing mill frame is determined according to the following formula.
Wherein I represents the number of the finishing mill frame;
EPS (I) is the pressing rate of the frame I,%;
THEN (I) is the thickness of steel at the inlet of the I frame, mm;
THEN (I +1) is the thickness of steel at the exit of the I frame, mm.
2) Method for determining pressure correction coefficient
The pressure correction coefficient is identified into two cases of a long genetic value and a short genetic value.
The determination condition of the long genetic value is at least one of the following conditions: 1) when the steel grade of the block of steel is inconsistent with that of the upper block of steel, taking a long genetic value; 2) when the thickness of the steel block is more than or equal to 10% of that of the upper steel block, taking a long genetic value; 3) and when the width of the steel block is more than or equal to 10% of the width of the upper steel block, taking the long genetic value.
The other cases except long inheritance are short inheritance.
The method for determining the pressure correction coefficient by the long genetic value comprises the following steps: taking the average value of the pressure correction coefficients of 30 close pieces of steel in a pressure correction coefficient database as the pressure correction coefficient of the steel; when the number of the approximate steels in the database is less than 30 pieces of steels, taking the average value of the pressure correction coefficients of the actual number of the steel pieces; when the steel grade does not exist in the database, the pressure correction coefficient takes a default value of 1.0.
The calculation method for determining the pressure correction coefficient by the short genetic value comprises the following steps:
NNFKORR(I)＝NNFKORR(I0)+0.68*(F(I0)-F(I00))/F(I00)
wherein NNFKORR (I) is the I frame pressure correction coefficient;
NNFKORR (I0) is a pressure correction coefficient of the steel block on the I frame;
f (I0) is the actual pressure, KN, of the steel block on the I frame;
f (I00) is the set pressure, KN, of the block of steel on the ith carriage.
However, when a titanium plate is hot-rolled, the following problems cannot be solved by using the above pressure control method.
The hardness value of the titanium plate No. I frame can not be obtained. Because the components of the titanium plate are unknown, and factors such as temperature, width and the like cannot be measured normally, the hardness value cannot be predicted before the titanium plate enters a finish rolling stand, so that the finish rolling pressure calculation has no basic prediction condition, and the hardness value is the basic condition of the whole model control, so that a hardness value calculation method with a reliable basis must be innovatively invented to complete the rolling pressure model control of the titanium plate.
The pressure correction coefficient can not be stored and calculated by the method, and has two reasons: a) because the rolling quantity of the titanium plate is very small, the interval time between two batches of rolling can be very long, under the condition of long inheritance, if the data of 30 approximate titanium plates are taken in the pressure correction coefficient database, the data collected by the 30 titanium plates can be taken in very long interval time, the rolling state is greatly changed due to the overlong interval time, and the 30 titanium plate data cannot represent the recent rolling characteristics, so that the phenomenon of inaccurate calculation is easily caused; b) in the production of titanium plates, a trolley furnace is adopted for heating plate blanks to burn the titanium plates, in the rolling process, the temperature loss between the first titanium plate and the second titanium plate in the same batch is large, the actual pressure difference between the two titanium plates is large, if short-term inheritance or the same long inheritance data is adopted between the two titanium plates, the rolling precision of the second titanium plate is very low, the rolling rule of the subsequent titanium plate behind the second titanium plate is close to that of the second titanium plate, and the short-term inheritance data can be used. Due to the two reasons, the value of the pressure correction coefficient cannot be taken according to the original value taking mode, the invention needs to invent a method suitable for the hot continuous rolling and rolling of the titanium plate to store and take the value of the pressure correction coefficient, and different application standards are adopted for long heredity and short heredity.
Aiming at the two problems of the titanium plate in the process of hot continuous rolling production and the prediction of the finish rolling pressure, the invention innovatively discloses a method for controlling the finish rolling pressure of the titanium plate on a hot continuous rolling line, which comprises the following steps: predicting the hardness of each finish rolling stand according to the sum of the rough rolling pressure; determining a pressure correction coefficient; calculating the reduction rate of the finish rolling rack; and calculating the rolling pressure of each frame of the finishing mill.
Specifically, in the actual rolling process of hot continuous rolling, long-time summary shows that the correlation between the hardness of each finish rolling stand and the rough rolling pressure is very strong, and the rough rolling pressure is high, so that the hardness of each finish rolling stand is high and the finish rolling pressure is high; on the contrary, the rough rolling pressure is low, the hardness value of each finish rolling machine frame is low, and the finish rolling pressure is also low. According to the above rules, the invention provides a method for predicting the hardness of each finish rolling stand according to the sum of rough rolling pressure (for example, a titanium plate is rolled for seven times in rough rolling, and the outlet target thickness is 35mm), which comprises the following steps:
(1) and determining the hardness distribution coefficients of different titanium plate varieties in each stand.
Specifically, a standard value MH for the hardness of each stand was determined0: TA1, TA2 and TA3 were 50000 KN; ti3111 is 40000 KN. On the basis of titaniumThe rolling characteristics and experiences of the plate in the trial rolling process determine the hardness distribution coefficient mhcoff (I) of different titanium plate varieties in the finish rolling I stand, and continuously debug the plate in the rolling process, finally the hardness distribution coefficient mhcoff (I) of the finish rolling I stand is formed as shown in the table 1:
TABLE 1 finish rolling I frame hardness distribution coefficient mhcoff (I)
Note: the above a-b means that the thickness is more than or equal to a and the thickness is less than b.
(2) Determining a finish rolling hardness correction coefficient according to the last pass pressure of rough rolling:
mhcorr＝RF/RFMH (3)
wherein mhcorr is a finish rolling hardness correction coefficient;
RF is the sum of rolling pressure of each pass of rough rolling, KN;
RFMH is standard load, KN.
In the invention, the thicknesses of various raw materials of the titanium plate are basically stable, wherein the thicknesses of TA1 and TA2 raw materials are 200-210 mm, the thickness of TA3 raw materials is 195-205 mm, and the thickness of Ti3111 raw materials is 170-180 mm, and the standard loads of A1, TA2 and TA3 RFMH are 142000KN and the standard load of Ti3111 RFMH is 60000 KN.
(3) Calculating the hardness value of each rack in finish rolling, wherein the calculation method comprises the following steps:
MH(I)＝MH0*mhcorr*mhcoff(I) (4)
wherein MH (I) is the I-th frame hardness, KN;
MH0the standard value of the I frame hardness, KN;
mhcorr is a finish rolling hardness correction coefficient;
mhcoff (I) is the hardness distribution coefficient of the finish rolling I stand.
Furthermore, the invention provides an access method for the pressure correction coefficient of the titanium plate.
The access method of the pressure correction coefficient comprises three conditions of rolling a first titanium plate, long inheritance and short inheritance.
The conditions for judging the long inheritance are as follows: a) the first titanium plate is started to be rolled into a long inheritance, and the second titanium plate is started to be rolled into a long inheritance; b) when the varieties of the titanium plate are different from the first titanium plate, the long genetic value is taken; c) when the thickness of the titanium plate is more than or equal to 10% of the thickness of the upper titanium plate, taking a long genetic value; d) and when the width of the titanium plate is more than or equal to 10% of the width of the upper titanium plate, the long genetic value is taken. In addition to the above, short inheritance is used for titanium plate rolling.
The method for determining the pressure correction coefficient by the long genetic value comprises the following steps: taking only the data (including the second titanium plate) after rolling the second titanium plate, and taking the average value of the pressure correction coefficients of 5 approximate titanium plates in the pressure correction coefficient database as the pressure correction coefficient of the titanium plate; when the number of the approximate titanium plates in the database is less than 5, taking the average value of the pressure correction coefficients of the actual number of the titanium plates; when the titanium plate variety does not exist in the database, the default value of the pressure correction coefficient is 1.0.
The method for determining the pressure correction coefficient of the first titanium plate during initial rolling comprises the following steps: firstly, taking data in a pressure correction coefficient database according to the variety specification, then adding a correction value on the basis of the data to be used as a pressure correction coefficient for rolling a first titanium plate, wherein the calculation method comprises the following steps:
NNFKORR1(I) ═ NNFKORR' (I) + correction value (5)
Wherein NNFKORR1(I) is the pressure correction coefficient of the I-th frame of the 1 st titanium plate after initial rolling;
NNFKORR' (I) is the I-th frame pressure correction coefficient calculated from the data in the database.
The calculation of NNFKORR' (I) is performed by methods commonly used in the art and will not be described in detail herein.
Wherein, the correction value of each rack is determined according to the variety and the thickness of the titanium plate, the correction value is obtained according to experience and test data, and the table model of the correction value of each variety is as follows:
table 2: correction value of pressure correction coefficient of I-th frame for first titanium plate
Note: the above a-b means that the thickness is more than or equal to a and the thickness is less than b.
The calculation method for determining the pressure correction coefficient by the short genetic value comprises the following steps:
NNFKORR(I)＝NNFKORR(I0)+0.8*(F(I0)-F(I00))/F(I00) (6)
wherein I is the number of the frame of the finishing mill;
NNFKORR (I) is the I frame pressure correction factor;
NNFKORR (I0) is a pressure correction coefficient of the titanium plate of the block I on the machine frame;
f (I0) is the actual pressure, KN, of the titanium plate on the frame I;
f (I00) is the set pressure, KN, of the titanium plate on the frame I.
After the pressure correction coefficient and the hardness of each stand are calculated according to the method, the rolling pressure of each stand in finish rolling is calculated according to the following method:
the first titanium plate is rolled by adopting the formula (7):
F(I)＝NNFKORR1(I)×MH(I)×EPS(I) (7)
if the first titanium plate is not rolled, calculating by adopting the formula (8):
F(I)＝NNFKORR(I)×MH(I)×EPS(I) (8)
wherein I is the number of the frame of the finishing mill;
f (I) is the I stand rolling pressure, KN;
NNFKORR1(I) is the pressure correction coefficient of the I-th frame for rolling the first titanium plate;
NNFKORR (I) is the I frame pressure correction coefficient (when not rolling the first titanium plate);
MH (I) is the I frame hardness, KN;
EPS (I) is the screw-down rate of the I frame,%.
The determination method of the reduction ratio EPS (I) comprises the following steps:
wherein I is the number of the frame of the finishing mill;
EPS (I) is the pressing rate of the frame I,%;
THEN (I) is the thickness of the titanium plate at the inlet of the finish rolling I rack, mm;
THEN (I +1) is the thickness of the titanium plate at the outlet of the finish rolling I machine frame, and is mm.
Before the development of the invention, the Tai-Gao hot continuous rolling 1549 wire has no special rolling pressure model aiming at the titanium plate. After the technology of the invention is applied in production, the rolling precision completely meets the rolling requirement of the titanium plate: the pressure deviation of each stand of the finish rolling is reduced to below 10 percent from the maximum 30 percent, the thickness deviation reaches within +/-0.15 mm, the rolling stability among the stands is good, and no rolling line waste products caused by the speciality of titanium plate varieties are generated.
The titanium plate has the benefit of 1000 yuan per ton, and can produce about 5000 tons per year, so that the annual benefit can be generated: 1000 yuan/ton 5000 ton 500 ten thousand yuan.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. Experimental procedures without specifying specific conditions in the following examples were carried out according to conventional methods and conditions.
In the examples, the equipment of a Tai steel 1549 hot continuous rolling line as shown in FIG. 1 was used. Wherein, 1 is a heating furnace, comprising 4 heating furnaces and 1 trolley furnace; 2 is a high-pressure water descaling box; 3 is a rough rolling vertical roller mill (VE 0); 4 is a rough rolling flat roller mill (R0); 5 is a heat preservation cover; 6, drum type crop flying shears; 7 are finish rolling machine frames (7 additional frames); 8 is a convexity meter; 9 is a width gauge; 10 is a thickness gauge; 11 is a flatness meter; 12 is a coiling machine.
Example 1
This example rolled a titanium sheet TA1, a first titanium sheet, coil No. 999113001.
The specification of the blank is as follows: the thickness is 206mm, the width is 1235mm, and the length is 8040 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: thickness 6.0mm, width 1238mm, target temperature 690 ℃.
Heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 880 ℃, the rough rolling after tapping adopts seven-pass rolling, the outlet thickness is 35mm, and the seven-pass rolling data are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The actual pressure sum of the rough rolling seven passes is 147582 KN.
The finish rolling pressure is calculated into a long genetic superposition correction value calculation mode, and the rolling pressure of each finish rolling rack is determined according to the following steps:
1) the thickness of the finished product of the titanium plate finish rolling is 6.0mm, and according to the table 1, the hardness distribution coefficient mhcoff (I) of each stand is determined as follows: 1.13760, 0.91836, 0.87793, 1.00076, 1.08356, 1.09995, 1.24678.
2) The sum of the actual pressure of the seven rough rolling passes is 147582KN, and the hardness correction coefficient mhcorr is determined according to the formula 3 as follows:
mhcorr＝RF/RFMH＝147582/142000＝1.03931。
3) according to equation 4: MH (i) ═ MH0Determining the hardness values of F0-F6 of each finish rolling stand as follows:
MH(0)＝50000*1.03931*1.13760＝59115.95KN
MH(1)＝50000*1.03931*0.91836＝47723.04KN
MH(2)＝50000*1.03931*0.87793＝45622.07KN
MH(3)＝50000*1.03931*1.00076＝52004.99KN
MH(4)＝50000*1.03931*1.09995＝57159.45KN
MH(5)＝50000*1.03931*1.10034＝57179.72KN
MH(6)＝50000*1.03931*1.24678＝64789.55KN
4) determining a pressure correction coefficient NNFKORR1 (I):
taking the data in the pressure correction coefficient database according to the variety specification as follows: 0.935, 0.646, 0.757, 0.661, 0.734, 0.795 and 0.768, and according to the table 2, the corrected values of NNFKORR1(I) of the first titanium plate rolled by each stand are determined to be 0.24, 0.19, 0.15, 0.14, 0.07, 0.02 and 0.01, and according to the formula (5), the values of F0-F6 pressure correction coefficients FKNNORR 1(I) are finally determined to be: 1.175, 0.836, 0.907, 0.801, 0.804, 0.815, 0.778.
5) According to the thickness of a finish rolling inlet of 35mm and the thickness of a finish rolling outlet of 6.0mm, the reduction rate (%) of each stand is finally determined by calculation as follows: 32.7, 31.7, 29.7, 22.3, 16.4, 10.4, 8.9.
6) According to equation (7): f (I) ═ NNFKORR1(I) × mh (I) × eps (I), and the rolling pressures of the stands of the titanium plate F0 to F6 were determined to be:
F(0)＝1.175*59115.95*32.7/100＝22713.8KN；
F(1)＝0.836*47723.04*31.7/100＝12647.2KN；
F(2)＝0.907*45622.07*29.7/100＝12289.6KN；
F(3)＝0.801*52004.99*22.3/100＝9289.3KN；
F(4)＝0.804*57159.45*16.4/100＝7536.8KN；
F(5)＝0.815*57179.72*10.4/100＝4846.6KN；
F(6)＝0.778*64789.55*8.9/100＝4486.2KN；
the rolling pressure and the roll gap value of each frame of the finish rolling after the titanium plate is rolled are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The total length thickness of the finished product after actual measurement is 6.14mm, and the requirements of customers are met.
This example rolled a titanium sheet TA3, a second titanium sheet, coil number 999113002.
The specification of the blank is as follows: the thickness is 209mm, the width is 1132mm, and the length is 8031 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: thickness 6.0mm, width 1138mm, target temperature 690 ℃.
Heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 880 ℃, the rough rolling after tapping adopts seven-pass rolling, the outlet thickness is 35mm, and the seven-pass rolling data are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The actual pressure sum of the rough rolling seven passes is 122721 KN.
The finish rolling pressure is calculated in a long genetic calculation mode, and the rolling pressure of each finish rolling rack is determined according to the following steps:
1) the thickness of the finished product of the titanium plate finish rolling is 6.0mm, and according to the table 1, the hardness distribution coefficient mhcoff (I) of each stand is determined as follows: 1.13760, 0.91836, 0.87793, 1.00076, 1.08356, 1.09995, 1.24678.
2) The sum of the actual pressure of the seven rough rolling passes is 122721KN, and the hardness correction coefficient mhcorr is determined according to the formula 3 as follows:
mhcorr＝RF/RFMH＝122721/142000＝0.86423。
3) according to equation 4: MH (i) ═ MH0Determining the hardness values of F0-F6 of each finish rolling stand as follows:
MH(0)＝50000*0.86423*1.13760＝49157.4KN
MH(1)＝50000*0.86423*0.91836＝39683.7KN
MH(2)＝50000*0.86423*0.87793＝37936.7KN
MH(3)＝50000*0.86423*1.00076＝43244.3KN
MH(4)＝50000*0.86423*1.08356＝46822.3KN
MH(5)＝50000*0.86423*1.09995＝47530.5KN
MH(6)＝50000*0.86423*1.24678＝53875.2KN
4) determining the pressure correction factor nnfkorr (i):
taking the data in the pressure correction coefficient database according to the variety specification as follows: 0.935, 0.646, 0.757, 0.661, 0.734, 0.795, 0.768.
5) According to the thickness of a finish rolling inlet of 35mm and the thickness of a finish rolling outlet of 4.5mm, the reduction rate (%) of each stand is finally determined by calculation as follows: 32.7, 31.7, 29.7, 22.3, 16.4, 10.4, 8.9.
6) According to equation (8): f (i) ═ nnfkorr (i) × mh (i) × eps (i), and the rolling pressure of each stand of the titanium plate F0 to F6 was determined as follows:
F(0)＝0.935*49157.4*32.7/100＝15029.6KN；
F(1)＝0.646*39683.7*31.7/100＝8126.5KN；
F(2)＝0.757*37936.7*29.7/100＝8529.3KN；
F(3)＝0.661*43244.3*22.3/100＝6374.3KN；
F(4)＝0.734*46822.3*16.4/100＝5636.3KN；
F(5)＝0.795*47530.5*10.4/100＝3929.8KN；
F(6)＝0.768*53875.2*8.9/100＝3682.5KN。
the rolling pressure and the roll gap value of each frame of the finish rolling after the titanium plate is rolled are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The total length thickness of the finished product after actual measurement is 6.05mm, and the requirements of customers are met.
This example rolled a titanium plate TA1, a third titanium plate having coil number 999113003.
The specification of the blank is as follows: the thickness is 209mm, the width is 1136mm, and the length is 8251 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: thickness 6.0mm, width 1138mm, target temperature 690 ℃.
Heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 880 ℃, the rough rolling after tapping adopts seven-pass rolling, the outlet thickness is 35mm, and the seven-pass rolling data are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The actual pressure sum of the rough rolling of seven passes is 122001 KN.
The finish rolling pressure is calculated in a short genetic calculation mode, and the rolling pressure of each frame of finish rolling is determined according to the following steps:
1) the thickness of the finished product of the titanium plate finish rolling is 6.0mm, and according to the table 1, the hardness distribution coefficient mhcoff (I) of each stand is determined as follows: 1.13760, 0.91836, 0.87793, 1.00076, 1.08356, 1.09995, 1.24678.
2) The total actual pressure of the seven rough rolling passes is 122001KN, and the hardness correction coefficient mhcorr is determined according to a formula 3 as follows:
mhcorr＝RF/RFMH＝122001/142000＝0.85916。
3) according to equation 4: MH (i) ═ MH0Determining the hardness values of F0-F6 of each finish rolling stand as follows:
MH(0)＝50000*0.85916*1.13760＝48869.0KN
MH(1)＝50000*0.85916*0.91836＝39450.9KN
MH(2)＝50000*0.85916*0.87793＝37714.1KN
MH(3)＝50000*0.85916*1.00076＝42990.6KN
MH(4)＝50000*0.85916*1.08356＝46547.6KN
MH(5)＝50000*0.85916*1.09995＝47251.7KN
MH(6)＝50000*0.85916*1.24678＝53559.2KN
4) determining the pressure correction factor nnfkorr (i):
the upper titanium plate is 999113002, the specification of the upper titanium plate is the same as that of the upper titanium plate, short inheritance is adopted, and the pressure coefficients of the seven racks of the upper titanium plate are respectively as follows: 0.935, 0.646, 0.757, 0.661, 0.734, 0.795, 0.768, the set pressure and the actual pressure are as follows:
according to equation (6): NNFKORR (I) NNFKORR (I0) +0.8 × (F (I0) -F (I00))/F (I00), each frame pressure coefficient NNFKORR (I) was calculated as follows:
NNFKORR(0)＝0.935+0.8*(15258.2-15029.6)/15029.6＝0.947
NNFKORR(1)＝0.646+0.8*(8237.5-8126.5)/8126.5＝0.657
NNFKORR(2)＝0.757+0.8*(8976.2-8529.3)/8529.3＝0.799
NNFKORR(3)＝0.661+0.8*(6965.4-6374.3)/6374.3＝0.735
NNFKORR(4)＝0.734+0.8*(5364.8-5636.3)/5636.3＝0.695
NNFKORR(5)＝0.795+0.8*(3930.2-3929.8)/3929.8＝0.795
NNFKORR(6)＝0.768+0.8*(3689.5-3682.5)/3682.5＝0.770
5) according to the thickness of a finish rolling inlet of 35mm and the thickness of a finish rolling outlet of 6.0mm, the reduction rate (%) of each stand is finally determined by calculation as follows: 32.7, 31.7, 29.7, 22.3, 16.4, 10.4, 8.9.
6) According to equation (7): f (i) ═ nnfkorr (i) × mh (i) × eps (i), and the rolling pressure of each stand of the titanium plate F0 to F6 was determined as follows:
F(0)＝0.947*48869.0*32.7/100＝15133.2KN；
F(1)＝0.657*39450.9*31.7/100＝8216.4KN；
F(2)＝0.799*37714.1*29.7/100＝8949.7KN；
F(3)＝0.735*42990.6*22.3/100＝7046.4KN；
F(4)＝0.695*46547.6*16.4/100＝5305.5KN；
F(5)＝0.795*47251.7*10.4/100＝3906.8KN；
F(6)＝0.770*53559.2*8.9/100＝3670.4KN；
the rolling pressure and the roll gap value of each frame of the finish rolling after the titanium plate is rolled are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The total length thickness of the finished product after actual measurement is 6.01mm, and the requirements of customers are met.
Example 2
This example rolled a titanium sheet TA2, first rolled a first titanium sheet, coil No. 99a 219301.
The specification of the blank is as follows: the thickness is 209mm, the width is 1133mm, and the length is 7375 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: thickness 4.5mm, width 1138mm, target temperature 690 ℃.
Heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 880 ℃, the rough rolling after tapping adopts seven-pass rolling, the outlet thickness is 35mm, and the seven-pass rolling data are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The actual pressure sum of the rough rolling seven passes is 141560 KN.
The finish rolling pressure is calculated into a long genetic superposition correction value calculation mode, and the rolling pressure of each finish rolling rack is determined according to the following steps:
1) the thickness of the finished product of the titanium plate finish rolling is 4.5mm, and according to the table 1, the hardness distribution coefficient mhcoff (I) of each stand is determined as follows: 1.14321, 0.92337, 0.88084, 1.01079, 1.09253, 1.10034, 1.26775.
2) The sum of the actual pressure of the seven rough rolling passes is 141560KN, and the hardness correction coefficient mhcorr is determined according to the formula 3 as follows: mhcorr RF/RFMH 141560/142000 0.9969.
3) According to equation 4: MH (i) ═ MH0Determining the hardness values of F0-F6 of each finish rolling stand as follows:
MH(0)＝50000*0.9969*1.14321＝56983.3KN
MH(1)＝50000*0.9969*0.92337＝46025.4KN
MH(2)＝50000*0.9969*0.88084＝43905.5KN
MH(3)＝50000*0.9969*1.01079＝50382.83KN
MH(4)＝50000*0.9969*1.09253＝54457.2KN
MH(5)＝50000*0.9969*1.10034＝54846.4KN
MH(6)＝50000*0.9969*1.26775＝63191KN
4) determining a pressure correction coefficient NNFKORR1 (I):
taking the data in the pressure correction coefficient database according to the variety specification as follows: 1.018, 0.748, 0.879, 0.752, 0.776, 0.861 and 0.939, and according to the table 2, determining the corrected values of the pressure correction coefficients of the first titanium plate rolled by each stand to be 0.25, 0.21, 0.17, 0.15, 0.09, 0.03 and 0.02, and finally determining the values of F0-F6 pressure correction coefficients NNFKORR1(I) according to the formula (5): 1.268, 0.958, 1.049, 0.902, 0.866, 0.891, 0.959.
5) According to the thickness of a finish rolling inlet of 35mm and the thickness of a finish rolling outlet of 4.5mm, the reduction rate (%) of each stand is finally determined by calculation as follows: 37.1, 36.0, 33.8, 25.3, 18.6, 11.8, 10.1.
6) According to equation (7): f (I) ═ NNFKORR1(I) × mh (I) × eps (I), and the rolling pressures of the stands of the titanium plate F0 to F6 were determined to be:
F(0)＝1.268*56983.3*37.1/100＝26806.5KN；
F(1)＝0.958*46025.4*36.0/100＝15873.2KN；
F(2)＝1.049*43905.5*33.8/100＝15567.2KN；
F(3)＝0.902*50382.83*25.3/100＝11497.7KN；
F(4)＝0.866*54457.2*18.6/100＝8771.7KN；
F(5)＝0.891*54846.4*11.8/100＝5766.4KN；
F(6)＝0.959*63191*10.1/100＝6120.6KN；
the rolling pressure and the roll gap value of each frame of the finish rolling after the titanium plate is rolled are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The total length thickness of the finished product after actual measurement is 4.56mm, and the requirements of customers are met.
This example rolled a titanium plate TA2, a second titanium plate, coil number 99A 219302.
The specification of the blank is as follows: the thickness is 209mm, the width is 1130mm, and the length is 8045 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: thickness 4.5mm, width 1138mm, target temperature 690 ℃.
Heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 880 ℃, the rough rolling after tapping adopts seven-pass rolling, the outlet thickness is 35mm, and the seven-pass rolling data are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The actual pressure sum of the rough rolling seven passes is 121602 KN.
The finish rolling pressure is calculated in a long genetic calculation mode, and the rolling pressure of each finish rolling rack is determined according to the following steps:
1) the thickness of the finished product of the titanium plate finish rolling is 4.5mm, and according to the table 1, the hardness distribution coefficient mhcoff (I) of each stand is determined as follows: 1.14321, 0.92337, 0.88084, 1.01079, 1.09253, 1.10034, 1.26775.
2) The sum of the actual pressure of the seven rough rolling passes is 121602KN, and the hardness correction coefficient mhcorr is determined according to the formula 3 as follows:
mhcorr＝RF/RFMH＝121602/142000＝0.85635。
3) according to formula (4): MH (i) ═ MH0Determining the hardness values of F0-F6 of each finish rolling stand as follows:
MH(0)＝50000*0.85635*1.14321＝48949KN
MH(1)＝50000*0.85635*0.92337＝39536.4KN
MH(2)＝50000*0.85635*0.88084＝37715.4KN
MH(3)＝50000*0.85635*1.01079＝43279.5KN
MH(4)＝50000*0.85635*1.09253＝46779.4KN
MH(5)＝50000*0.85635*1.10034＝47113.8KN
MH(6)＝50000*0.85635*1.26775＝54281.9KN
4) determining the pressure correction factor nnfkorr (i):
taking the data in the pressure correction coefficient database according to the variety specification as follows: 1.018, 0.748, 0.879, 0.752, 0.776, 0.861, 0.939.
5) According to the thickness of a finish rolling inlet of 35mm and the thickness of a finish rolling outlet of 4.5mm, the reduction rate (%) of each stand is finally determined by calculation as follows: 37.1, 36.0, 33.8, 25.3, 18.6, 11.8, 10.1.
6) According to equation (8): f (i) ═ nnfkorr (i) × mh (i) × eps (i), and the rolling pressure of each stand of the titanium plate F0 to F6 was determined as follows:
F(0)＝1.018*48949*37.1/100＝18487KN；
F(1)＝0.748*39536.4*36.0/100＝10646.4KN；
F(2)＝0.879*37715.4*33.8/100＝11205.3KN；
F(3)＝0.752*43279.5*25.3/100＝8234.18KN；
F(4)＝0.776*46779.4*18.6/100＝6751.95KN；
F(5)＝0.861*47113.8*11.8/100＝4786.67KN；
F(6)＝0.939*54281.9*10.1/100＝5148.04KN；
the rolling pressure and the roll gap value of each frame of the finish rolling after the titanium plate is rolled are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The total length thickness of the finished product after actual measurement is 4.53mm, and the requirements of customers are met.
This example rolled a titanium plate TA2, a third titanium plate, coil number 99A 219303.
The specification of the blank is as follows: thickness 209mm, width 1131mm, length 7953 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: thickness 4.5mm, width 1138mm, target temperature 690 ℃.
Heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 880 ℃, the rough rolling after tapping adopts seven-pass rolling, the outlet thickness is 35mm, and the seven-pass rolling data are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The actual pressure sum of the rough rolling seven passes is 116344 KN.
The finish rolling pressure is calculated in a short genetic calculation mode, and the rolling pressure of each frame of finish rolling is determined according to the following steps:
1) the thickness of the finished product of the titanium plate finish rolling is 4.5mm, and according to the table 1, the hardness distribution coefficient mhcoff (I) of each stand is determined as follows: 1.14321, 0.92337, 0.88084, 1.01079, 1.09253, 1.10034, 1.26775.
2) The sum of the actual pressure of the seven rough rolling passes is 116344KN, and the hardness correction coefficient mhcorr is determined according to the formula 3 as follows:
mhcorr＝RF/RFMH＝116344/142000＝0.81932。
3) according to equation 4: MH (i) ═ MH0Determining the hardness values of F0-F6 of each finish rolling stand as follows:
MH(0)＝50000*0.81932*1.14321＝46832.7KN
MH(1)＝50000*0.81932*0.92337＝37826.8KN
MH(2)＝50000*0.81932*0.88084＝36084.5KN
MH(3)＝50000*0.81932*1.01079＝41408KN
MH(4)＝50000*0.81932*1.09253＝44756.6KN
MH(5)＝50000*0.81932*1.10034＝45076.5KN
MH(6)＝50000*0.81932*1.26775＝51934.6KN
4) determining the pressure correction factor nnfkorr (i):
the upper titanium plate is 99A219303, the upper titanium plate and the upper titanium plate have the same specification, short inheritance is adopted, and the pressure coefficients of seven frames are respectively: 1.018, 0.748, 0.879, 0.752, 0.776, 0.861, 0.939, set and actual pressures as follows:
according to equation (6): NNFKORR (I) NNFKORR (I0) +0.8 × (F (I0) -F (I00))/F (I00), each frame pressure coefficient NNFKORR (I) was calculated as follows:
NNFKORR(0)＝1.018+0.8*(19301.3-18487)/18487＝1.053
NNFKORR(1)＝0.748+0.8*(11752.9-10646.4)/10646.4＝0.831
NNFKORR(2)＝0.879+0.8*(12100.5-11205.3)/11205.3＝0.943
NNFKORR(3)＝0.752+0.8*(8333.7-8234.18)/8234.18＝0.762
NNFKORR(4)＝0.776+0.8*(6812.9-6751.95)/6751.95＝0.783
NNFKORR(5)＝0.861+0.8*(5327.8-4786.67)/4786.67＝0.951
NNFKORR(6)＝0.939+0.8*(5319.5-5148.04)/5148.04＝0.966
5) according to the thickness of a finish rolling inlet of 35mm and the thickness of a finish rolling outlet of 4.5mm, the reduction rate (%) of each stand is finally determined by calculation as follows: 37.1, 36.0, 33.8, 25.3, 18.6, 11.8, 10.1.
6) According to equation (7): f (i) ═ nnfkorr (i) × mh (i) × eps (i), and the rolling pressure of each stand of the titanium plate F0 to F6 was determined as follows:
F(0)＝1.053*46832.7*37.1/100＝18295.8KN；
F(1)＝0.831*37826.8*36.0/100＝11316.3KN；
F(2)＝0.943*36084.5*33.8/100＝11501.4KN；
F(3)＝0.762*41408*25.3/100＝7982.88KN；
F(4)＝0.783*44756.6*18.6/100＝6518.26KN；
F(5)＝0.951*45076.5*11.8/100＝5058.39KN；
F(6)＝0.966*51934.6*10.1/100＝5067.05KN；
the rolling pressure and the roll gap value of each frame of the finish rolling after the titanium plate is rolled are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The total length thickness of the finished product after actual measurement is 4.49mm, and the requirement of a client is met.
Example 3
This example rolled a titanium sheet TA3, a first titanium sheet, coil No. 991148901.
The specification of the blank is as follows: the thickness is 200mm, the width is 1190mm, and the length is 7795 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: thickness 5.0mm, width 1190mm, target temperature 690 ℃.
Heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 880 ℃, the rough rolling after tapping adopts seven-pass rolling, the outlet thickness is 35mm, and the seven-pass rolling data are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The actual pressure sum of the rough rolling seven passes is 153906 KN.
The finish rolling pressure is calculated into a long genetic superposition correction value calculation mode, and the rolling pressure of each finish rolling rack is determined according to the following steps:
1) the thickness of the finished product of the titanium plate finish rolling is 5.0mm, and according to the table 1, the hardness distribution coefficient mhcoff (I) of each stand is determined as follows: 1.15981, 0.94057, 0.90014, 1.02297, 1.10577, 1.12216, 1.26899.
2) The sum of the actual pressure of the seven rough rolling passes is 153906KN, and the hardness correction coefficient mhcorr is determined according to the formula 3 as follows:
mhcorr＝RF/RFMH＝153906/142000＝1.08385。
3) according to equation 4: MH (i) ═ MH0Determining the hardness values of F0-F6 of each finish rolling stand as follows:
MH(0)＝50000*1.08385*1.15981＝62853.0KN
MH(1)＝50000*1.08385*0.94057＝50971.8KN
MH(2)＝50000*1.08385*0.90014＝48780.8KN
MH(3)＝50000*1.08385*1.02297＝55437.3KN
MH(4)＝50000*1.08385*1.10577＝59924.4KN
MH(5)＝50000*1.08385*1.12216＝60812.7KN
MH(6)＝50000*1.08385*1.26899＝68769.7KN
4) determining a pressure correction coefficient NNFKORR1 (I):
taking the data in the pressure correction coefficient database according to the variety specification as follows: 0.883, 0.761, 0.831, 0.774, 0.739, 0.837 and 0.906, and according to the table 2, determining the pressure correction coefficient correction values of the first titanium plate rolled by each stand as 0.27, 0.21, 0.18, 0.17, 0.09, 0.04 and 0.03, and finally determining the pressure correction coefficients NNFKORR1(I) of F0-F6 according to the formula (5) as follows: 1.153, 0.971, 1.011, 0.944, 0.829, 0.877, 0.936.
5) According to the thickness of a finish rolling inlet of 35mm and the thickness of a finish rolling outlet of 5.0mm, the reduction rate (%) of each stand is finally determined by calculation as follows: 35.5, 34.5, 32.3, 24.2, 17.8, 11.3, 9.7.
6) According to equation (7): f (I) ═ NNFKORR1(I) × mh (I) × eps (I), and the rolling pressures of the stands of the titanium plate F0 to F6 were determined to be:
F(0)＝1.153*62853.0*35.5/100＝25726.7KN；
F(1)＝0.971*50971.8*34.5/100＝17075.3KN；
F(2)＝1.011*48780.8*32.3/100＝15929.5KN；
F(3)＝0.944*55437.3*24.2/100＝12664.5KN；
F(4)＝0.829*59924.4*17.8/100＝8842.6KN；
F(5)＝0.877*60812.7*11.3/100＝6026.6KN；
F(6)＝0.936*68769.7*9.7/100＝6243.7KN。
the rolling pressure and the roll gap value of each frame of the finish rolling after the titanium plate is rolled are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The total length thickness of the finished product after actual measurement is 5.10mm, and the requirements of customers are met.
This example rolled a titanium sheet TA3, a second titanium sheet, coil number 991149001.
The specification of the blank is as follows: the thickness is 195mm, the width is 1078mm, and the length is 7020 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: thickness 4.5mm, width 1078mm, target temperature 690 ℃.
Heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 880 ℃, the rough rolling after tapping adopts seven-pass rolling, the outlet thickness is 35mm, and the seven-pass rolling data are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The actual pressure sum of the rough rolling seven passes is 129582 KN.
The finish rolling pressure is calculated in a long genetic calculation mode, and the rolling pressure of each finish rolling rack is determined according to the following steps:
1) the thickness of the finished product of the titanium plate finish rolling is 4.5mm, and according to the table 1, the hardness distribution coefficient mhcoff (I) of each stand is determined as follows: 1.16542, 0.94558, 0.90305, 1.033, 1.11474, 1.12255, 1.28996.
2) The sum of the actual pressure of the seven rough rolling passes is 129582KN, and the hardness correction coefficient mhcorr is determined according to the formula 3 as follows:
mhcorr＝RF/RFMH＝129582/142000＝0.91255。
3) according to formula (4): MH (i) ═ MH0Determining the hardness values of F0-F6 of each finish rolling stand as follows:
MH(0)＝50000*0.91255*1.16542＝53175.2KN
MH(1)＝50000*0.91255*0.94558＝43144.5KN
MH(2)＝50000*0.91255*0.90305＝41203.9KN
MH(3)＝50000*0.91255*1.033＝47133.2KN
MH(4)＝50000*0.91255*1.11474＝50862.8KN
MH(5)＝50000*0.91255*1.12255＝51219.2KN
MH(6)＝50000*0.91255*1.28996＝58857.6KN
4) determining the pressure correction factor nnfkorr (i):
taking the data in the pressure correction coefficient database according to the variety specification as follows: 0.978, 0.789, 0.892, 0.705, 0.811, 0.867 and 0.983.
5) According to the thickness of a finish rolling inlet of 35mm and the thickness of a finish rolling outlet of 4.5mm, the reduction rate (%) of each stand is finally determined by calculation as follows: 37.1, 36.0, 33.8, 25.3, 18.6, 11.8, 10.1.
6) According to equation (7): f (i) ═ nnfkorr (i) × mh (i) × eps (i), and the rolling pressure of each stand of the titanium plate F0 to F6 was determined as follows:
F(0)＝0.978*53175.2*37.1/100＝19294.0KN；
F(1)＝0.789*43144.5*36.0/100＝12254.8KN；
F(2)＝0.892*41203.9*33.8/100＝12422.8KN；
F(3)＝0.705*47133.2*25.3/100＝8406.9KN；
F(4)＝0.811*50862.8*18.6/100＝7672.4KN；
F(5)＝0.867*51219.2*11.8/100＝5240.07KN；
F(6)＝0.867*58857.6*10.1/100＝5154.0KN。
the rolling pressure and the roll gap value of each frame of the finish rolling after the titanium plate is rolled are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The total length thickness of the finished product after actual measurement is 4.51mm, and the requirements of customers are met.
This example rolled a titanium plate TA3, a third titanium plate having coil number 991149101.
The specification of the blank is as follows: the thickness is 195mm, the width is 1260mm, and the length is 6820 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: thickness 7.0mm, width 1260mm, target temperature 690 ℃.
Heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 880 ℃, the rough rolling after tapping adopts seven-pass rolling, the outlet thickness is 35mm, and the seven-pass rolling data are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The actual pressure sum of the rough rolling of seven passes is 167135 KN.
The thickness and width difference between the titanium plate and the upper titanium plate are more than 10%, the finish rolling pressure is calculated in a long genetic calculation mode, and the rolling pressure of each stand for finish rolling is determined according to the following steps:
1) the thickness of the finished product of the titanium plate finish rolling is 7.0mm, and according to the table 1, the hardness distribution coefficient mhcoff (I) of each stand is determined as follows: 1.15476, 0.93967, 0.88315, 1.01299, 1.09465, 1.12009, 1.24211.
2) The sum of the actual pressure of the seven rough rolling passes is 167135KN, and the hardness correction coefficient mhcorr is determined according to a formula 3 as follows:
mhcorr＝RF/RFMH＝167135/142000＝1.17701。
3) according to equation 4: MH (i) ═ MH0Determining the hardness values of F0-F6 of each finish rolling stand as follows:
MH(0)＝50000*1.17701*1.15476＝67958.2KN
MH(1)＝50000*1.17701*0.93967＝55300.0KN
MH(2)＝50000*1.17701*0.88315＝51973.8KN
MH(3)＝50000*1.17701*1.01299＝59615.0KN
MH(4)＝50000*1.17701*1.09465＝64420.7KN
MH(5)＝50000*1.17701*1.12009＝65917.9KN
MH(6)＝50000*1.17701*1.24211＝73098.8KN
4) determining the pressure correction factor nnfkorr (i):
the thickness and width of the titanium plate and the upper titanium plate are different by more than 10%, long inheritance is adopted, and the data in the pressure correction coefficient database are taken as follows: 0.977, 0.724, 0.817, 0.744, 0.834, 0.922, 0.927.
5) According to the thickness of a finish rolling inlet of 35mm and the thickness of a finish rolling outlet of 7.0mm, the reduction rate (%) of each stand is finally determined by calculation as follows: 30.2, 29.3, 27.5, 20.6, 15.1, 9.6, 8.2.
6) According to equation (7): f (i) ═ nnfkorr (i) × mh (i) × eps (i), and the rolling pressure of each stand of the titanium plate F0 to F6 was determined as follows:
F(0)＝0.977*67958.2*30.2/100＝20051.3KN；
F(1)＝0.724*55300.0*29.3/100＝11730.9KN；
F(2)＝0.817*51973.8*27.5/100＝11677.2KN；
F(3)＝0.744*59615.0*20.6/100＝9136.8KN；
F(4)＝0.834*64420.7*15.1/100＝8112.8KN；
F(5)＝0.922*65917.9*9.6/100＝5834.5KN；
F(6)＝0.927*73098.8*8.2/100＝5556.5KN；
the rolling pressure and the roll gap value of each frame of the finish rolling after the titanium plate is rolled are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The total length thickness of the finished product after actual measurement is 7.06mm, and the requirements of customers are met.
Example 4
This example rolled a titanium sheet TI3111, rolled a first titanium sheet with a coil number of 966097201.
The specification of the blank is as follows: 173mm in thickness, 1075mm in width and 6440mm in length; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: thickness 5.2mm, width 1080mm, target temperature 800 ℃.
Heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 930 ℃, and the rough rolling after tapping adopts seven-pass rolling, the outlet thickness is 35mm, and the seven-pass rolling data are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The actual pressure sum of the rough rolling seven passes is 60075.8 KN.
The finish rolling pressure is calculated into a long genetic superposition correction value calculation mode, and the rolling pressure of each finish rolling rack is determined according to the following steps:
1) the thickness of the finished product of the titanium plate finish rolling is 5.2mm, and according to the table 1, the hardness distribution coefficient mhcoff (I) of each stand is determined as follows: 1.31371, 1.08035, 1.11178, 1.12679, 1.23467, 1.24230, 1.31332.
2) The sum of the actual pressure of the seven rough rolling passes is 60075.8KN, and the hardness correction coefficient mhcorr is determined according to the formula 3 as follows: mhcorr RF/RFMH 60075.8/60000 1.00126.
3) According to formula (4): MH (i) ═ MH0Determining the hardness values of F0-F6 of each finish rolling stand as follows:
MH(0)＝40000*1.00126*1.31371＝52614.6KN
MH(1)＝40000*1.00126*1.08035＝43268.4KN
MH(2)＝40000*1.00126*1.11178＝44527.2KN
MH(3)＝40000*1.00126*1.12679＝45128.4KN
MH(4)＝40000*1.00126*1.23467＝49449.0KN
MH(5)＝40000*1.00126*1.24230＝49754.6KN
MH(6)＝40000*1.00126*1.31332＝52599.0KN
4) determining a pressure correction coefficient NNFKORR1 (I):
taking the data in the pressure correction coefficient database according to the variety specification as follows: 1.064, 0.868, 0.771, 0.642, 0.622, 0.782 and 0.854, determining the pressure correction coefficient correction values of the first titanium plate rolled by each stand to be 0.26, 0.23, 0.17, 0.15, 0.09, 0.03 and 0.02 according to the table 2, and finally determining the F0-F6 pressure correction coefficient FKORR1(I) values according to the formula (5): 1.324, 1.098, 0.941, 0.792, 0.712, 0.812, 0.874.
5) According to the thickness of a finish rolling inlet of 35mm and the thickness of a finish rolling outlet of 5.0mm, the reduction rate (%) of each stand is finally determined by calculation as follows: 34.3, 35.9, 31.2, 23.4, 17.2, 10.9, 9.4.
6) According to equation (7): f (I) ═ NNFKORR1(I) × mh (I) × eps (I), and the rolling pressures of the stands of the titanium plate F0 to F6 were determined to be:
F(0)＝1.324*52614.6*34.3/100＝23894.0KN；
F(1)＝1.098*43268.4*35.9/100＝17055.6KN；
F(2)＝0.941*44527.2*31.2/100＝13072.8KN；
F(3)＝0.792*45128.4*23.4/100＝8363.6KN；
F(4)＝0.712*49449.0*10.9/100＝3837.6KN；
F(5)＝0.812*49754.6*9.4/100＝3797.7KN；
F(6)＝0.874*52599.0*9.7/100＝4459.2KN；
the rolling pressure and the roll gap value of each frame of the finish rolling after the titanium plate is rolled are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The total length thickness of the finished product after actual measurement is 5.29mm, and the requirements of customers are met.
This example rolled a titanium plate Ti3111, a second titanium plate, coil number 966097202.
The specification of the blank is as follows: the thickness is 195mm, the width is 1080mm, and the length is 7220 m; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: thickness 5.2mm, width 1078mm, target temperature 800 ℃.
Heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 930 ℃, and the rough rolling after tapping adopts seven-pass rolling, the outlet thickness is 35mm, and the seven-pass rolling data are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The actual pressure sum of the rough rolling seven passes is 57955.2 KN.
The finish rolling pressure is calculated in a long genetic calculation mode, and the rolling pressure of each finish rolling rack is determined according to the following steps:
1) the thickness of the finished product of the titanium plate finish rolling is 5.2mm, and according to the table 1, the hardness distribution coefficient mhcoff (I) of each stand is determined as follows: 1.31371, 1.08035, 1.11178, 1.12679, 1.23467, 1.24230, 1.31332.
2) The sum of the actual pressure of the seven rough rolling passes is 57955.2KN, and the hardness correction coefficient mhcorr is determined according to the formula 3 as follows: mhcorr RF/RFMH 57955.2/60000 0.96592.
3) According to formula (4): MH (i) ═ MH0Determining the hardness values of F0-F6 of each finish rolling stand as follows:
MH(0)＝40000*0.96592*1.31371＝50757.6KN
MH(1)＝40000*0.96592*1.08035＝41741.3KN
MH(2)＝40000*0.96592*1.11178＝42955.6KN
MH(3)＝40000*0.96592*1.12679＝43535.6KN
MH(4)＝40000*0.96592*1.23467＝47703.7KN
MH(5)＝40000*0.96592*1.24230＝47998.5KN
MH(6)＝40000*0.96592*1.31332＝50742.5KN
4) determining the pressure correction factor nnfkorr (i):
taking the data in the pressure correction coefficient database according to the variety specification as follows: 1.064, 0.868, 0.771, 0.642, 0.622, 0.782, 0.854.
5) According to the thickness of a finish rolling inlet of 35mm and the thickness of a finish rolling outlet of 5.2mm, the reduction rate (%) of each stand is finally determined by calculation as follows: 34.3, 35.9, 31.2, 23.4, 17.2, 10.9, 9.4.
6) According to equation (7): f (i) ═ nnfkorr (i) × mh (i) × eps (i), and the rolling pressure of each stand of the titanium plate F0 to F6 was determined as follows:
F(0)＝1.064*50757.6*34.3/100＝18524.1KN；
F(1)＝0.868*41741.3*35.9/100＝13007.1KN；
F(2)＝0.771*42955.6*31.2/100＝10333.1KN；
F(3)＝0.642*43535.6*23.4/100＝6540.3KN；
F(4)＝0.622*47703.7*17.2/100＝5103.5KN；
F(5)＝0.782*47998.5*10.9/100＝4091.3KN；
F(6)＝0.854*50742.5*9.4/100＝4073.4KN。
the rolling pressure and the roll gap value of each frame of the finish rolling after the titanium plate is rolled are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The total length thickness of the finished product after actual measurement is 5.23mm, and the requirements of customers are met.
This example rolled a titanium plate Ti3111 and a third titanium plate with a coil number of 966097203.
The specification of the blank is as follows: the thickness is 195mm, the width is 1077mm, and the length is 8001 m; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: thickness 5.2mm, width 1078mm, target temperature 800 ℃.
Heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 930 ℃, and the rough rolling after tapping adopts seven-pass rolling, the outlet thickness is 35mm, and the seven-pass rolling data are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The actual pressure sum of the rough rolling seven passes is 57109.3 KN.
The thickness and width difference between the titanium plate and the upper titanium plate are more than 10%, the finish rolling pressure is calculated in a long genetic calculation mode, and the rolling pressure of each stand for finish rolling is determined according to the following steps:
1) the thickness of the finished product of the titanium plate finish rolling is 5.2mm, and according to the table 1, the hardness distribution coefficient mhcoff (I) of each stand is determined as follows: 1.31371, 1.08035, 1.11178, 1.12679, 1.23467, 1.24230, 1.31332.
2) The sum of the actual pressure of the seven rough rolling passes is 57109.3KN, and the hardness correction coefficient mhcorr is determined according to the formula 3 as follows: mhcorr RF/RFMH 57109.3/60000 0.95182.
3) According to equation 4: MH (i) ═ MH0Determining the hardness values of F0-F6 of each finish rolling stand as follows:
MH(0)＝40000*0.95182*1.31371＝50016.6KN
MH(1)＝40000*0.95182*1.08035＝41131.9KN
MH(2)＝40000*0.95182*1.11178＝42328.6KN
MH(3)＝40000*0.95182*1.12679＝42900.1KN
MH(4)＝40000*0.95182*1.23467＝47007.3KN
MH(5)＝40000*0.95182*1.24230＝47297.8KN
MH(6)＝40000*0.95182*1.31332＝50001.8KN
4) determining the pressure correction factor nnfkorr (i):
the upper titanium plate is 966097202, the specification of the upper titanium plate is the same as that of the upper titanium plate, short inheritance is adopted, and the pressure coefficients of the upper steel seven stand are respectively as follows: 1.064, 0.868, 0.771, 0.642, 0.622, 0.782, 0.854, the set pressures and actual pressures are as follows:
according to equation (6): NNFKORR (I) NNFKORR (I0) +0.8 × (F (I0) -F (I00))/F (I00), each frame pressure coefficient NNFKORR (I) was calculated as follows:
NNFKORR(0)＝1.064+0.8*(19101.3-18524.1)/18524.1＝1.089
NNFKORR(1)＝0.868+0.8*(12577.6-13007.1)/13007.1＝0.842
NNFKORR(2)＝0.771+0.8*(10745.1-10333.1)/10333.1＝0.803
NNFKORR(3)＝0.642+0.8*(6356.5-6540.3)/6540.3＝0.620
NNFKORR(4)＝0.622+0.8*(4653.7-5103.5)/5103.5＝0.551
NNFKORR(5)＝0.782+0.8*(4078.9-4091.3)/4091.3＝0.780
NNFKORR(6)＝0.854+0.8*(4205.8-4073.4)/4073.4＝0.880
5) according to the thickness of a finish rolling inlet of 35mm and the thickness of a finish rolling outlet of 5.2mm, the reduction rate (%) of each stand is finally determined by calculation as follows: 34.3, 35.9, 31.2, 23.4, 17.2, 10.9, 9.4.
6) According to equation (8): f (i) ═ nnfkorr (i) × mh (i) × eps (i), and the rolling pressure of each stand of the titanium plate F0 to F6 was determined as follows:
F(0)＝1.089*50016.6*34.3/100＝18682.6KN；
F(1)＝0.842*41131.9*35.9/100＝12433.3KN；
F(2)＝0.803*42328.6*31.2/100＝10604.8KN；
F(3)＝0.620*42900.1*23.4/100＝6223.9KN；
F(4)＝0.551*47007.3*17.2/100＝4455.0KN；
F(5)＝0.780*47297.8*10.9/100＝4021.3KN；
F(6)＝0.880*50001.8*9.4/100＝4136.1KN；
the rolling pressure and the roll gap value of each frame of the finish rolling after the titanium plate is rolled are as follows:
note: the set pressure means the calculated pressure, and the set roll gap means the actual roll gap.
The total length thickness of the finished product after actual measurement is 5.01mm, and the requirements of customers are met.
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to those of the embodiments are intended to be included within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.
Claims (10)
1. A method for controlling the finish rolling pressure of a titanium plate on a hot continuous rolling line is characterized by comprising the following steps:
predicting the hardness of each finish rolling stand according to the sum of the rough rolling pressure;
determining a pressure correction coefficient;
calculating the reduction rate of the finish rolling rack;
and calculating the rolling pressure of each frame of the finishing mill.
2. The method for controlling the rolling pressure in the finish rolling of a titanium sheet in a hot continuous rolling line according to claim 1, wherein the step of predicting the hardness of each stand in the finish rolling based on the sum of the rough rolling pressure comprises:
(1) determining the hardness distribution coefficients of different titanium plate varieties in each stand;
(2) determining a finish rolling hardness correction coefficient according to the last pass pressure of rough rolling:
mhcorr＝RF/RFMH
wherein mhcorr is a finish rolling hardness correction coefficient;
RF is the sum of rolling pressure of each pass of rough rolling, KN;
RFMH is the standard load, KN;
(3) calculating the hardness value of each rack in finish rolling, wherein the calculation method comprises the following steps:
MH(I)＝MH0*mhcorr*mhcoff(I)
wherein I is the number of the frame of the finishing mill;
MH (I) is the I frame hardness, KN;
MH0the standard value of the hardness of each frame, KN;
mhcorr is a finish rolling hardness correction coefficient;
mhcoff (I) is the hardness distribution coefficient of the finish rolling I stand.
3. The method of controlling rolling pressure in a hot continuous rolling line of a titanium plate as set forth in claim 2, wherein the standard value of the hardness of each stand of TA1, TA2 and TA3 is 50000KN, and the standard value of the hardness of each stand of Ti3111 is 40000 KN; the standard loads of TA1, TA2 and TA3 were 142000KN, and the standard load of Ti3111 was 60000 KN.
4. The method for controlling the finish rolling pressure of a titanium sheet in a hot continuous rolling line according to claim 2, wherein the hardness distribution coefficient of the finish rolling I-th stand is:
5. the method for controlling the finish rolling pressure of a titanium sheet in a hot continuous rolling line according to claim 1, wherein the confirmation of the pressure correction coefficient includes three cases of the first titanium sheet being rolled, the long inheritance and the short inheritance.
6. The method for controlling the finish rolling pressure of a titanium plate on a hot continuous rolling line according to claim 5, wherein the condition for judging the inheritance of elongation is: (a) rolling a first titanium plate and a second titanium plate to be long-genetic; (b) starting to roll a third titanium plate, and taking a long genetic value when the variety of the titanium plate is different from that of the previous titanium plate; (c) when the thickness of the titanium plate is more than or equal to 10% of the thickness of the upper titanium plate, taking a long genetic value; (d) and when the width of the titanium plate is more than or equal to 10% of the width of the upper titanium plate, the long genetic value is taken.
7. The method for controlling the finish rolling pressure of a titanium plate on a hot continuous rolling line according to claim 5, wherein the method for determining the pressure correction coefficient from the long genetic value comprises: only taking the data of the second titanium plate and the subsequent data, and taking the average value of the pressure correction coefficients of the 5 titanium plates which are close to the average value in the pressure correction coefficient database as the pressure correction coefficient of the titanium plate; when the number of the approximate titanium plates in the database is less than 5, taking the average value of the pressure correction coefficients of the actual number of the titanium plates; when the titanium plate variety does not exist in the database, the default value of the pressure correction coefficient is 1.0.
8. The method for controlling the finish rolling pressure of a titanium plate on a hot continuous rolling line according to claim 5, wherein the calculation method for determining the pressure correction coefficient from the short genetic value comprises:
NNFKORR(I)＝NNFKORR(I0)+0.8*(F(I0)-F(I00))/F(I00)
wherein NNFKORR (I) is the I frame pressure correction coefficient;
NNFKORR (I0) is a pressure correction coefficient of the titanium plate of the block I on the machine frame;
f (I0) is the actual pressure, KN, of the titanium plate on the frame I;
f (I00) is the set pressure, KN, of the titanium plate on the frame I.
9. The method for controlling the finish rolling pressure of the titanium plate on the hot continuous rolling line according to claim 5, wherein the method for determining the pressure correction coefficient of the first titanium plate after the first titanium plate is rolled comprises the following steps:
NNFKORR1(I) ═ NNFKORR' (I) + correction value
Wherein NNFKORR1(I) is the pressure correction coefficient of the I-th stand for rolling the first titanium plate;
NNFKORR' (I) is the I-th frame pressure correction coefficient calculated from the data in the database.
10. The method for controlling the finish rolling pressure of a titanium plate on a hot continuous rolling line according to claim 9, wherein the correction value is obtained from experience and experimental data, and the table model of the correction value for each steel type is as follows:
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