CN113857247B - Production method of hot continuous rolling titanium alloy plate - Google Patents
Production method of hot continuous rolling titanium alloy plate Download PDFInfo
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- CN113857247B CN113857247B CN202111215707.0A CN202111215707A CN113857247B CN 113857247 B CN113857247 B CN 113857247B CN 202111215707 A CN202111215707 A CN 202111215707A CN 113857247 B CN113857247 B CN 113857247B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 254
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 83
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 83
- 239000010936 titanium Substances 0.000 claims abstract description 83
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 230000033764 rhythmic process Effects 0.000 claims abstract description 7
- 238000009826 distribution Methods 0.000 claims description 30
- 238000013000 roll bending Methods 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 9
- 239000010959 steel Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 8
- 229910001200 Ferrotitanium Inorganic materials 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 3
- 230000004048 modification Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 18
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
Abstract
The application relates to a production method of a hot continuous rolling titanium alloy plate, and belongs to the technical field of rolling processes of titanium alloy plates. The application breaks through the characteristic of inherent titanium-steel cross rolling, adopts a two-seat heating furnace titanium loading mode, realizes batch rolling of titanium alloy in a hot continuous rolling steel production line, shortens rolling time from original 20 hours to 10 hours. The most critical effect is that the technical problem that the titanium alloy head is deviated, buckled and warped after the working roll of the finishing mill is replaced is creatively solved, and the production smooth and technical breakthrough is realized. The application only changes the rolling process, is convenient and quick to operate, and basically does not need input cost. The rolling mode does not need to be switched back and forth, so that the rolling rhythm of the titanium plate is improved, the preparation time and the rolling time before the production of the titanium plate are shortened, the operation rate is improved, and the effect of solving the big problem by small modification is achieved.
Description
Technical Field
The application relates to a production method of a hot continuous rolling titanium alloy plate, and belongs to the technical field of rolling processes of titanium alloy plates.
Background
In the case of a conventional hot rolling mill having only two heating furnaces, since the heating temperature of the titanium plate is lower than the heating temperature of the slab by about 400 ℃, it is generally considered that one furnace heats the slab and one furnace heats the slab. After the preparation of the relevant conditions of the titanium plate is finished, 20-40 billets are rolled firstly and then the titanium billets are rolled in order to ensure successful rolling of the titanium plate in the rolling process, and the main purpose is to adjust the stability of equipment and the rolling roll gap of a rolling mill by using billet rolling so as to check the reliability of a detection instrument. The method has become a production mode for producing the hot continuous rolling titanium plate, but the switching of the back and forth mode of the cross rolling leads to higher probability of error of operators and more defects.
Firstly, the time spent in the rolling process is long. One furnace for steel and one furnace for titanium, and 25 titanium billets can be produced from 2 hours of furnace shutdown, 6 hours of installation of rolling line equipment, 5 hours of rolling process and 3 to 5 hours of equipment recovery and 16 to 20 hours. Mainly cross rolling, and the production rhythm of 5-7 titanium plates can be completed in one heating furnace for 1 hour.
Secondly, the cross rolling needs to switch the titanium production mode and the steel production mode back and forth, the procedures are complicated, confusion is easy, and abnormal conditions are generated.
Thirdly, the rolling rhythm is limited, the production capacity of the titanium plate of the heating furnace is 5 blocks/hour, which is equivalent to producing 1 block of titanium blank in 12 minutes, and when the finishing mill rolls, the working roller is always in a cold roller state, which is not beneficial to the stable threading of the titanium alloy head.
Disclosure of Invention
The technical problems to be solved by the application are as follows: the production method of the hot continuous rolling titanium alloy plate can effectively improve production efficiency.
The technical scheme adopted by the application for solving the technical problems is as follows: the production method of the hot continuous rolling titanium alloy plate comprises the following steps:
1. before rolling a titanium alloy coil by hot continuous rolling, arranging a small unit of 5-10 billets for rolling, and resetting and leveling a working roll of a finishing mill by adopting a working roll shape of the titanium alloy for rolling, wherein a normal program of the working roll is cleared when the working roll is replaced;
2. in the rolling process of 5-10 billets, rolling in a mode of 1+3, wherein the rolling speed of rough rolling R2 is 3.0m/s-4.5m/s, and the thickness of an intermediate billet is controlled between 30mm and 35 mm;
3. recording roll gap values of a transmission side and an operation side of each frame and deviation values of roll gaps of two sides when each billet is rolled, and recording rolling load deviation values of each frame and roll bending force technical parameters of each billet;
4. after 5-10 billets are rolled, extracting working rolls of a finishing mill, preparing to install matched equipment for titanium alloy production, wherein the working rolls of the finishing mill are not replaced, and the working rolls of the previous rolling are installed after relevant equipment conditions are prepared, and a hydraulic cylinder of the finishing mill does not carry out zero clearing calibration and directly presses against to carry out roller leveling and uses a hydraulic pressing function;
5. adopting a titanium loading mode of two heating furnaces, and starting rolling a first rolled titanium blank; the heating furnace and the rough rolling are carried out according to the normal titanium alloy rolling process; the rolling parameters of the titanium alloy finish rolling are adjusted according to the parameters of the previous billet production, and the adjusted rolling parameters comprise one or more of a roll gap deviation value, a rolling load deviation value and a roll bending force value of the two sides;
6. rolling the second rolled titanium blank, and adjusting rolling parameters of finish rolling according to the rolling condition of the first rolled titanium blank, wherein the adjusted rolling parameters comprise one or more of a roll gap deviation value, a rolling load deviation value and a roll bending force value of two sides;
7. and (3) after finishing the titanium polishing of the final stand of the finishing mill, rolling the final stand of the finishing mill immediately after the second rolling, and controlling the rolling rhythm according to 20-25 titanium plates in one hour.
Further, the load distribution and roll gap calculation model of the finish rolling is as follows:
the thickness of the intermediate blank is set as A, the thickness of the rolled finished product is set as B,
the numbers of the finish rolling mills are F1, F2, F3, F4, F5 and F6 respectively,
the titanium plate rolling load distribution coefficient of the finish rolling mill F1 is K1, the titanium plate rolling load distribution coefficient of the finish rolling mill F2 is K2,
the titanium plate rolling load distribution coefficient of the finish rolling mill F3 is K3, the titanium plate rolling load distribution coefficient of the finish rolling mill F4 is K4,
the titanium plate rolling load distribution coefficient of the finish rolling mill F5 is K5, the titanium plate rolling load distribution coefficient of the finish rolling mill F6 is K6,
the sum of the titanium plate rolling load distribution coefficients is set as S, namely S=K1+K2+K3+K4+K5+K6,
the finishing mill reduction is calculated according to the following formula:
the depression amount of F1= (a-B) x K1/S,
the depression amount of F2= (a-B) x K2/S,
the depression amount of F3= (a-B) x K3/S,
the depression amount of F4= (a-B) x K4/S,
the depression amount of F5= (a-B) x K5/S,
the depression amount of F6= (a-B) x K6/S,
the finishing mill roll gap is calculated according to the following formula:
outlet thickness of F1 = amount of depression of a-F1,
outlet thickness of F2 = outlet thickness of F1-depression of F2,
outlet thickness of F3 = outlet thickness of F2-depression of F3,
outlet thickness of F4 = outlet thickness of F3-depression of F4,
outlet thickness of F5 = outlet thickness of F4-depression of F5,
outlet thickness of F6 = outlet thickness of F5-depression of F6,
wherein, the value of K1 is 2.5-3.0, the value of K2 is 1.2-1.33, the value of K3 is 0.5-0.687, the value of K4 is 0.2-0.39, the value of K5 is 0.1-0.22, and the value of K6 is 0.05-0.09.
The beneficial effects of the application are as follows: the characteristic of inherent titanium-steel cross rolling is broken, the titanium loading mode of two heating furnaces is adopted, the batch rolling of titanium alloy in a hot continuous rolling steel production line is realized, the rolling time is shortened, and the rolling time is shortened to 10 hours from 20 hours. The most critical effect is that the technical problem that the titanium alloy head is deviated, buckled and warped after the working roll of the finishing mill is replaced is creatively solved, and the production smooth and technical breakthrough is realized. Through implementation and application in nearly two years, the titanium alloy is rolled by more than 2000 tons in a certain conventional hot continuous rolling production line, the rolling time is shortened by 80 hours, the rolling deviation and the buckling and warping waste titanium rate of each stand of the finishing mill are zero, the working procedure operation rate is improved to 77.80% from the previous 56.3%, and the method has strong practicability and remarkable effect. The application only changes the rolling process, is convenient and quick to operate, and basically does not need input cost. The rolling mode does not need to be switched back and forth, so that the rolling rhythm of the titanium plate is improved, the preparation time and the rolling time before the production of the titanium plate are shortened, the operation rate is improved, and the effect of solving the big problem by small modification is achieved.
Detailed Description
The application comprises the following steps:
1. before rolling a titanium alloy coil by hot continuous rolling, arranging a small unit of 5-10 billets for rolling, and resetting and leveling a working roll of a finishing mill by adopting a working roll shape of the titanium alloy for rolling, wherein a normal program of the working roll is cleared when the working roll is replaced;
2. in the process of rolling 5-10 billets, the rolling is carried out according to the conventional process, and the preferable mode is that rolling is carried out in a mode of 1+3, the rolling speed of rough rolling R2 is 3.0m/s-4.5m/s, and the thickness of an intermediate billet is controlled between 30mm and 35 mm;
3. recording roll gap values of a transmission side and an operation side of each frame and deviation values of roll gaps of two sides when each billet is rolled, and recording rolling load deviation values of each frame and roll bending force technical parameters of each billet; at present, the record is usually carried out manually by an operator, and the data can be automatically acquired by adopting a sensor;
4. after 5-10 billets are rolled, extracting working rolls of a finishing mill, preparing to install matched equipment for titanium alloy production, wherein the working rolls of the finishing mill are not replaced, and the working rolls of the previous rolling are installed after relevant equipment conditions are prepared, and a hydraulic cylinder of the finishing mill does not carry out zero clearing calibration and directly presses against to carry out roller leveling and uses a hydraulic pressing function; the fact that the finishing mill working rolls are not replaced refers to the fact that the finishing mill working rolls are the same set of finishing mill working rolls used for rolling steel and titanium, but the finishing mill working rolls are switched to a titanium rolling mode, corresponding matched equipment is needed to be replaced, the finishing mill working rolls are needed to be removed in the process, and the matched equipment needed by titanium alloy production is the conventional technology; the hydraulic cylinder of the finishing mill can not carry out zero clearing calibration, but directly presses against to carry out roller leveling, and the hydraulic pressing function is put into use, so that the rolling parameter standard is prevented from being lost; the load adjustable interval of the pressing force is generally 500 tons to 1500 tons, and about 1000 tons are usually needed to be pressed for leveling the roller;
5. adopting a titanium loading mode of two heating furnaces, and starting rolling a first rolled titanium blank; the heating furnace and the rough rolling are carried out according to the normal titanium alloy rolling process; the rolling parameters of the titanium alloy finish rolling are adjusted according to the parameters of the previous billet production, and the adjusted rolling parameters comprise one or more of a roll gap deviation value, a rolling load deviation value and a roll bending force value of the two sides; the method is characterized in that the method is to correspondingly adjust and compensate according to the appearance quality of a finished product produced by a billet, ensure that a first titanium billet for initial rolling can be smoothly pierced and rolled, and generally be manually adjusted by an operator;
6. rolling the second rolled titanium blank, and adjusting rolling parameters of finish rolling according to the rolling condition of the first rolled titanium blank, wherein the adjusted rolling parameters comprise one or more of a roll gap deviation value, a rolling load deviation value and a roll bending force value of two sides; here too, the adjustment control is generally carried out manually by an operator;
7. and (3) after finishing the titanium polishing of the final stand of the finishing mill, rolling the final stand of the finishing mill immediately after the second rolling, and controlling the rolling rhythm according to 20-25 titanium plates in one hour.
The application breaks through the characteristic of inherent titanium-steel cross rolling, adopts two heating furnaces to load titanium, realizes batch rolling of titanium alloy in a hot continuous rolling steel production line, directly shortens the rolling time of a titanium plate from 20 hours to about 10 hours, and has no comparison of rolling parameters of a few blocks before the production of the titanium alloy. The threading rolling of the previous titanium alloy is affected by a plurality of factors, so that the problems of deviation and buckling and warping exist at high probability, and the probability of waste generation is quite high. Therefore, the rolling parameters of the billet are recorded in the third step, adjustment and compensation are carried out in the sixth step and the seventh step, the working roll gap of each stand of the hot continuous rolling finishing mill is controlled in real time, deviation at two sides is adjusted to correct deviation, buckling and warping heads with heads bent up and down are controlled, and smooth threading is realized mainly by adjusting the deviation, bending force and rolling force of the roll gap at two sides of the working roll of the finishing mill. In order to facilitate adjustment and control and effectively ensure the quality of products, the inventor of the application searches a large number of production practices, determines the titanium plate rolling load distribution coefficient of each rack of the finishing mill, establishes a finish rolling load distribution and roll gap calculation model on the basis, and stores the model in a secondary computer database for actual production. Specifically, the load distribution and roll gap calculation model of the finish rolling is as follows:
the thickness of the intermediate blank is set as A, the thickness of the rolled finished product is set as B,
the numbers of the finish rolling mills are F1, F2, F3, F4, F5 and F6 respectively,
the titanium plate rolling load distribution coefficient of the finish rolling mill F1 is K1, the titanium plate rolling load distribution coefficient of the finish rolling mill F2 is K2,
the titanium plate rolling load distribution coefficient of the finish rolling mill F3 is K3, the titanium plate rolling load distribution coefficient of the finish rolling mill F4 is K4,
the titanium plate rolling load distribution coefficient of the finish rolling mill F5 is K5, the titanium plate rolling load distribution coefficient of the finish rolling mill F6 is K6,
the sum of the titanium plate rolling load distribution coefficients is set as S, namely S=K1+K2+K3+K4+K5+K6,
the finishing mill reduction is calculated according to the following formula:
the depression amount of F1= (a-B) x K1/S,
the depression amount of F2= (a-B) x K2/S,
the depression amount of F3= (a-B) x K3/S,
the depression amount of F4= (a-B) x K4/S,
the depression amount of F5= (a-B) x K5/S,
the depression amount of F6= (a-B) x K6/S,
the finishing mill roll gap is calculated according to the following formula:
outlet thickness of F1 = amount of depression of a-F1,
outlet thickness of F2 = outlet thickness of F1-depression of F2,
outlet thickness of F3 = outlet thickness of F2-depression of F3,
outlet thickness of F4 = outlet thickness of F3-depression of F4,
outlet thickness of F5 = outlet thickness of F4-depression of F5,
outlet thickness of F6 = outlet thickness of F5-depression of F6,
wherein, the value of K1 is 2.5-3.0, the value of K2 is 1.2-1.33, the value of K3 is 0.5-0.687, the value of K4 is 0.2-0.39, the value of K5 is 0.1-0.22, and the value of K6 is 0.05-0.09. The rolling load distribution coefficient of the titanium plate is constant, and is determined by the inventor of the application through a great deal of experiments.
For ease of understanding, the following is illustrative.
Such as: the thickness of the rolled product of the titanium alloy is 3.0mm, the thickness of the intermediate billet is 30mm, and the rolling load distribution coefficients of the titanium plates of each stand of the finishing mill are shown in Table 1.
Table 1 titanium plate Rolling load distribution coefficient of each stand of finishing mill
| F1 | F2 | F3 | F4 | F5 | F6 |
| 2.8 | 1.33 | 0.687 | 0.39 | 0.22 | 0.09 |
Titanium plate rolling load distribution coefficient summation: s=2.8+1.33+0.687+0.39+0.22+0.09= 5.517.
And (5) calculating the rolling reduction of the finishing mill:
the depression amount of F1= (30-3) ×2.8/5.517 = 13.7031,
the depression amount of F2= (30-3) ×1.33/5.517 = 6.5089,
f3 reduction= (30-3) x 0.687/5.517 = 3.3621,
f4 reduction = (30-3) x 0.39/5.517 = 1.9086,
f5 reduction = (30-3) x 0.22/5.517 = 1.0766,
f6 reduction = (30-3) x 0.09/5.517 =0.4404,
calculating the roll gap of the finishing mill:
f1 outlet thickness = 30-13.7031 = 16.2969,
f2 outlet thickness= 16.3969-6.5089 = 9.7879,
f3 outlet thickness= 9.7879-3.3621 = 6.4257,
f4 outlet thickness= 6.4257-1.9086 = 4.5171,
f5 outlet thickness = 4.5171-1.0766 = 3.4405,
f6 outlet thickness= 3.4404-0.4404=3.
The application is further illustrated below with reference to examples.
Example 1:
the embodiment adopts a hot continuous rolling production line to produce a large-volume heavy titanium alloy roll TA0, 30 rolls and 222.20 tons are produced at one time, and the rolling specification is as follows: thickness x width = 3.5mm to 6.5mm x 1050mm to 1250mm, specific examples apply the techniques of the present application. The method comprises the following steps:
(1) Using a titanium alloy rolling roller type upper machine to finish rolling a finished product, and carrying out rolling configuration on a front frame; f1 = +0.25mm, f2 = -0.15mm,
f3 -0.20mm. 6 billets were rolled.
(2) The two heating furnaces are both provided with titanium blanks, and the heating furnaces and rough rolling are both carried out according to the normal titanium alloy rolling process.
(3) The final 3 specifications of billet rolling are 4.0mm multiplied by 1050mm, and the two specifications of titanium plates before rolling are 4.5mm multiplied by 1050mm. (4) And recording rolling gap deviation, load deviation and roll bending force data in the billet rolling process. Fifth, six steel billet rolling data
See table 2.
(5) The rolling data of the first and second titanium alloys are shown in Table 3, and the rolling gap and rolling force are greatly different, but the rolling force must be ensured
The difference between the roll gaps at the two sides and the difference between the rolling pressures are basically unchanged relative to billet rolling.
Table 2 fifth and sixth billet rolling data of example 1
Table 3 first and second block of titanium alloy rolling data of example 1
The implementation effect is as follows:
in the implementation process of the embodiment 1, rolling deviation (roll gap deviation) of a first titanium billet is rolled according to the roll gap deviation value of the last two rolling data of the billet, the head threading is stable, no deviation phenomenon exists, a certain wave shape exists after the threading, a certain inclination of the roll gap is indicated, and a trace adjustment is carried out in the rolling process of a second titanium billet. The rolling force deviation basically keeps the reference value of the last block, the condition of upward bending and downward buckling does not exist, the buckling and tilting rolling process is stable, the surface and plate shape quality of the titanium strip coil are good, the rolling time of the titanium strip is shortened by 8 hours, and the operation rate is improved by 10.3%.
Example 2:
the embodiment adopts a hot continuous rolling production line to produce a large-volume heavy titanium alloy roll TA1, and produces 23 rolls and 197.8 tons at one time, and the rolling specification is as follows: thickness x width = 5.0mm to 10.0mm x 1050mm, specific examples apply the techniques of the present application. The method comprises the following steps:
(1) Using a titanium alloy rolling roller type upper machine to finish rolling a finished product, and carrying out rolling configuration on a front frame; f1 = +0.25mm, f2 = -0.15mm,
f3 -0.20mm. 7 billets were rolled.
(2) The two heating furnaces are both provided with titanium blanks, and the heating furnaces and rough rolling are both carried out according to the normal titanium alloy rolling process.
(3) The final 3 specifications of billet rolling are 5.0mm multiplied by 1050mm, and the two specifications of titanium plates before rolling are 5.0mm multiplied by 1050mm. (4) And recording rolling gap deviation, load deviation and roll bending force data in the billet rolling process. Sixth, seven steel billet rolling data
See table 4.
Table 4 sixth and seventh billet rolling data of example 2
(5) The rolling data of the first and second titanium alloys are shown in Table 5, and the difference between the roll gap and the rolling pressure at both sides must be kept substantially unchanged, although there is a large difference between the roll gap and the rolling force.
Table 5 first and second block of titanium alloy rolling data of example 2
The implementation effect is as follows:
in the implementation process of the embodiment 2, the rolling deviation (roll gap deviation) of the first titanium billet is rolled according to the roll gap deviation value of the last two rolling data of the billet, the head threading is stable, and the deviation phenomenon does not exist. And carrying out micro adjustment in the rolling process of the second titanium blank. The rolling process is stable, the quality of the surface and the plate shape of the titanium strip coil is good, the rolling time of the titanium strip is shortened by 10 hours, and the operation rate is improved by 13.3%.
Example 3:
the embodiment adopts a hot continuous rolling production line to produce a large-volume heavy titanium alloy roll TA1, and produces 20 volumes and 172 tons at one time, and the rolling specification is as follows: thickness x width = 7.0mm to 10.0mm x 1250mm, specific examples apply the techniques of the present application. The method comprises the following steps:
(1) Using a titanium alloy rolling roller type upper machine to finish rolling a finished product, and carrying out rolling configuration on a front frame; f1 = +0.25mm, f2 = -0.15mm,
f3 -0.20mm. 6 billets were rolled.
(2) The two heating furnaces are both provided with titanium blanks, and the heating furnaces and rough rolling are both carried out according to the normal titanium alloy rolling process.
(3) The specification is thick, the final 2 blocks of the titanium alloy are 7.0mm multiplied by 1250mm, and the final 2 blocks of the titanium alloy are produced by adopting a F3/F5 frame
The two specifications before rolling of the plate are 7.0mm multiplied by 1250mm.
(4) And recording rolling gap deviation, load deviation and roll bending force data in the billet rolling process. Fifth, six steel billet rolling data
See table 6.
(5) The rolling data of the first and second titanium alloys are shown in Table 7, and the rolling gap and rolling force are greatly different, but the rolling force must be ensured
The difference in roll gap between the two sides and the difference in rolling pressure remain substantially unchanged.
Table 6 fifth and sixth billet rolling data of example 3
Table 7 first and second block of titanium alloy rolling data of example 3
The implementation effect is as follows:
in the implementation process of the embodiment 3, the head threading is stable, and the deviation phenomenon does not exist. And carrying out micro adjustment in the rolling process of the second titanium blank. The rolling process is stable, the quality of the surface and the plate shape of the titanium strip coil is good, the rolling time of the titanium strip is shortened by 7 hours, and the operation rate is improved by 9.6%.
Claims (1)
1. The production method of the hot continuous rolling titanium alloy plate is characterized by comprising the following steps of:
1. before rolling a titanium alloy coil by hot continuous rolling, arranging a small unit of 5-10 billets for rolling, and resetting and leveling a working roll of a finishing mill by adopting a working roll shape of the titanium alloy for rolling, wherein a normal program of the working roll is cleared when the working roll is replaced;
2. in the rolling process of 5-10 billets, rolling in a mode of 1+3, wherein the rolling speed of rough rolling R2 is 3.0m/s-4.5m/s, and the thickness of an intermediate billet is controlled between 30mm and 35 mm;
3. recording roll gap values of a transmission side and an operation side of each frame and deviation values of roll gaps of two sides when each billet is rolled, and recording rolling load deviation values of each frame and roll bending force technical parameters of each billet;
4. after 5-10 billets are rolled, extracting working rolls of a finishing mill, preparing to install matched equipment for titanium alloy production, wherein the working rolls of the finishing mill are not replaced, and the working rolls of the previous rolling are installed after relevant equipment conditions are prepared, and a hydraulic cylinder of the finishing mill does not carry out zero clearing calibration and directly presses against to carry out roller leveling and uses a hydraulic pressing function;
5. adopting a titanium loading mode of two heating furnaces, and starting rolling a first rolled titanium blank; the heating furnace and the rough rolling are carried out according to the normal titanium alloy rolling process; the rolling parameters of the titanium alloy finish rolling are adjusted according to the parameters of the previous billet production, and the adjusted rolling parameters comprise one or more of a roll gap deviation value, a rolling load deviation value and a roll bending force value of the two sides;
6. rolling the second rolled titanium blank, and adjusting rolling parameters of finish rolling according to the rolling condition of the first rolled titanium blank, wherein the adjusted rolling parameters comprise one or more of a roll gap deviation value, a rolling load deviation value and a roll bending force value of two sides;
7. the finishing mill end frame is rolled immediately after finishing titanium polishing, and rolling rhythm control is carried out according to 20-25 titanium plates in one hour;
and step five and step six, when rolling parameters are adjusted, the load distribution and roll gap calculation model of the finish rolling is as follows:
the thickness of the intermediate blank is set as A, the thickness of the rolled finished product is set as B,
the numbers of the finish rolling mills are F1, F2, F3, F4, F5 and F6 respectively,
the titanium plate rolling load distribution coefficient of the finish rolling mill F1 is K1, the titanium plate rolling load distribution coefficient of the finish rolling mill F2 is K2,
the titanium plate rolling load distribution coefficient of the finish rolling mill F3 is K3, the titanium plate rolling load distribution coefficient of the finish rolling mill F4 is K4,
the titanium plate rolling load distribution coefficient of the finish rolling mill F5 is K5, the titanium plate rolling load distribution coefficient of the finish rolling mill F6 is K6,
the sum of the titanium plate rolling load distribution coefficients is set as S, namely S=K1+K2+K3+K4+K5+K6,
the finishing mill reduction is calculated according to the following formula:
the depression amount of F1= (a-B) x K1/S,
the depression amount of F2= (a-B) x K2/S,
the depression amount of F3= (a-B) x K3/S,
the depression amount of F4= (a-B) x K4/S,
the depression amount of F5= (a-B) x K5/S,
the depression amount of F6= (a-B) x K6/S,
the finishing mill roll gap is calculated according to the following formula:
outlet thickness of F1 = amount of depression of a-F1,
outlet thickness of F2 = outlet thickness of F1-depression of F2,
outlet thickness of F3 = outlet thickness of F2-depression of F3,
outlet thickness of F4 = outlet thickness of F3-depression of F4,
outlet thickness of F5 = outlet thickness of F4-depression of F5,
outlet thickness of F6 = outlet thickness of F5-depression of F6,
wherein, the value of K1 is 2.5-3.0, the value of K2 is 1.2-1.33, the value of K3 is 0.5-0.687, the value of K4 is 0.2-0.39, the value of K5 is 0.1-0.22, and the value of K6 is 0.05-0.09.
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