CN113857247A - 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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- CN113857247A CN113857247A CN202111215707.0A CN202111215707A CN113857247A CN 113857247 A CN113857247 A CN 113857247A CN 202111215707 A CN202111215707 A CN 202111215707A CN 113857247 A CN113857247 A CN 113857247A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 268
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 55
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 86
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 86
- 239000010936 titanium Substances 0.000 claims abstract description 86
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 230000033764 rhythmic process Effects 0.000 claims abstract description 7
- 238000009826 distribution Methods 0.000 claims description 31
- 238000013000 roll bending Methods 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 229910001200 Ferrotitanium Inorganic materials 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 19
- 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
- 238000005098 hot rolling 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 invention relates to a production method of a hot continuous rolling titanium alloy plate, belonging to the technical field of rolling processes of titanium alloy plates. The invention breaks the inherent characteristic of titanium-steel cross rolling, adopts the titanium loading mode of two heating furnaces, realizes the batch rolling of titanium alloy in the hot continuous rolling steel production line, shortens the rolling time from the original 20 hours to 10 hours. The most critical effect is that the technical problem of titanium alloy head deviation and head warping after the finishing mill working roll is replaced is creatively solved, and the smooth production and the technical breakthrough are realized. The invention only changes the rolling process, is convenient and quick to operate and basically does not need investment 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 a large problem by small change is achieved.
Description
Technical Field
The invention relates to a production method of a hot continuous rolling titanium alloy plate, belonging to the technical field of rolling processes of titanium alloy plates.
Background
In the case of only two heating furnaces in a conventional hot rolling mill, since the heating temperature of a titanium plate is about 400 ℃ lower than that of a steel slab, it is generally considered that one furnace is charged with a titanium slab for heating and one furnace is charged with a steel slab for heating. After the preparation of relevant conditions of the titanium plate is finished, in order to ensure the smooth and successful rolling of the titanium plate in the rolling process, 20-40 steel billets are rolled firstly and then the titanium billet is rolled, and the main purposes are to adjust the stability of equipment by using the steel billet rolling and adjust the rolling roll gap of a rolling mill 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 cross rolling back-and-forth mode causes the error probability of operators to be high, and the defects are more.
One is the long time spent in the rolling process. And (3) charging steel and titanium in one furnace, and producing 25 titanium billets from 2 hours of furnace shutdown, preparation of rolling line equipment to 6 hours of installation, 5 hours of rolling process and 3-5 hours of equipment recovery, wherein the 16-20 hours are required. Mainly adopts cross rolling, and only can finish the production rhythm of 5-7 titanium plates within 1 hour of a heating furnace.
And secondly, the titanium production mode and the steel production mode need to be switched back and forth in the cross rolling process, so that the process is complicated and easy to confuse, and abnormal conditions are caused.
And thirdly, the rolling rhythm is limited, the production capacity of the titanium plate of one heating furnace is 5 pieces/hour, namely 1 titanium billet is produced in 12 minutes, and when the finish rolling mill rolls, the working roll is always in a cold roll state, which is not beneficial to the stable threading of the head of the titanium alloy.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the production method of the hot continuous rolling titanium alloy plate can effectively improve the production efficiency.
In order to solve the technical problems, the invention adopts the technical scheme that: the production method of the hot continuous rolling titanium alloy plate comprises the following steps:
arranging a small unit of 5-10 steel billets for rolling before hot continuous rolling of titanium alloy coils, wherein the working roll of a finishing mill adopts a titanium alloy rolled working roll shape, and the working roll is reset and leveled in a normal program when the roll is changed;
secondly, in the rolling process of 5-10 steel billets, rolling in a mode of 1+3, wherein the rolling speed of rough rolling R2 is 3.0-4.5 m/s, and the thickness of the intermediate billet is controlled between 30mm and 35 mm;
recording roll gap values of a transmission side and an operation side of each rack and roll gap deviation values of two sides when each steel billet is rolled, and recording rolling load deviation values and roll bending force value technical parameters of each rack of each steel billet;
after rolling of the fourth, 5-10 steel billets, extracting the working rolls of the finishing mill, preparing for installation of supporting equipment for titanium alloy production, wherein the working rolls of the finishing mill are not replaced, the working rolls rolled before are installed after preparation of relevant equipment conditions is completed, and the hydraulic cylinders of the finishing mill are not reset and calibrated, are directly pressed to level the rolls and have a hydraulic pressing function;
fifthly, adopting a titanium loading mode of two heating furnaces to roll a first rolled titanium blank; the heating furnace and the rough rolling are both executed according to a normal titanium alloy rolling process; the rolling parameters of the titanium alloy finish rolling are adjusted according to the parameters of the prior billet production, and the adjusted rolling parameters comprise one or more of the deviation value of roll gaps on two sides, the rolling load deviation value and the roll bending force value;
sixthly, rolling the second rolled titanium blank, and adjusting the 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 the deviation value of roll gaps on two sides, the rolling load deviation value and the bending force value;
and seventhly, after finishing titanium polishing of the last stand of the finishing mill, immediately following the second rolling, and performing rolling rhythm control on 20-25 titanium plates in one hour.
Further, the load distribution and roll gap calculation model of finish rolling is as follows:
the thickness of the intermediate billet is set to be A, the thickness of the rolled finished product is set to be B,
the numbers of the finish rolling mills are respectively F1, F2, F3, F4, F5 and F6,
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 load distribution coefficients of the titanium plate rolling is set to be S, namely S is K1+ K2+ K3+ K4+ K5+ K6,
the rolling reduction of the finishing mill is calculated according to the following formula:
the rolling reduction of F1 was (a-B) × K1/S,
the rolling reduction of F2 was (a-B) × K2/S,
the rolling reduction of F3 was (a-B) × K3/S,
the rolling reduction of F4 was (a-B) × K4/S,
the rolling reduction of F5 was (a-B) × K5/S,
the rolling reduction of F6 was (a-B) × K6/S,
the roll gap of the finishing mill is calculated according to the following formula:
the outlet thickness of F1 is equal to the reduction of a-F1,
the outlet thickness of F2-the reduction of F2 of the outlet thickness of F1,
the outlet thickness of F3-the reduction of F3 of the outlet thickness of F2,
the outlet thickness of F4-the reduction of F4 of the outlet thickness of F3,
the outlet thickness of F5-the reduction of F5 of the outlet thickness of F4,
the outlet thickness of F6-the reduction of F6 of the outlet thickness of F5,
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 invention has the beneficial effects that: the method breaks the inherent characteristic of cross rolling of titanium and steel, adopts a titanium loading mode of two heating furnaces, realizes batch rolling of titanium alloy in a hot continuous rolling steel production line, and shortens the rolling time from the original 20 hours to 10 hours. The most critical effect is that the technical problem of titanium alloy head deviation and head warping after the finishing mill working roll is replaced is creatively solved, and the smooth production and the technical breakthrough are realized. Through implementation and application in nearly two years, more than 2000 tons of titanium alloy is rolled on a certain conventional hot continuous rolling production line, the rolling time of 80 hours is shortened, the rolling deviation and head warping waste titanium rate of each stand of a finishing mill is zero, the working procedure operation rate is improved to 77.80 percent from the previous 56.3 percent, the practicability is high, and the effect is obvious. The invention only changes the rolling process, is convenient and quick to operate and basically does not need investment 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 a large problem by small change is achieved.
Detailed Description
The invention comprises the following steps:
arranging a small unit of 5-10 steel billets for rolling before hot continuous rolling of titanium alloy coils, wherein the working roll of a finishing mill adopts a titanium alloy rolled working roll shape, and the working roll is reset and leveled in a normal program when the roll is changed;
secondly, in the rolling process of 5-10 billets, the rolling is carried out according to the conventional process, preferably, the rolling is carried out in a mode of 1+3, the rolling speed of rough rolling R2 is 3.0-4.5 m/s, and the thickness of the intermediate billet is controlled between 30mm and 35 mm;
recording roll gap values of a transmission side and an operation side of each rack and roll gap deviation values of two sides when each steel billet is rolled, and recording rolling load deviation values and roll bending force value technical parameters of each rack of each steel billet; at present, the manual recording is usually carried out by operators, and certainly, a sensor can also be adopted for carrying out automatic data acquisition;
after rolling of the fourth, 5-10 steel billets, extracting the working rolls of the finishing mill, preparing for installation of supporting equipment for titanium alloy production, wherein the working rolls of the finishing mill are not replaced, the working rolls rolled before are installed after preparation of relevant equipment conditions is completed, and the hydraulic cylinders of the finishing mill are not reset and calibrated, are directly pressed to level the rolls and have a hydraulic pressing function; the 'finishing mill working roll is not replaced' means that steel rolling 'and titanium rolling' are the same set of finishing mill working roll, but are switched into a titanium rolling mode, corresponding matched equipment needs to be replaced, the finishing mill working roll needs to be detached 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 be subjected to zero clearing calibration, but is directly pressed to perform roller leveling, and a hydraulic pressing function is used, so that the rolling parameter reference is prevented from being lost; the load adjustable interval of the pressing force is generally 500-1500 tons, and the roller is required to be pressed by about 1000 tons to be leveled;
fifthly, adopting a titanium loading mode of two heating furnaces to roll a first rolled titanium blank; the heating furnace and the rough rolling are both executed according to a normal titanium alloy rolling process; the rolling parameters of the titanium alloy finish rolling are adjusted according to the parameters of the prior billet production, and the adjusted rolling parameters comprise one or more of the deviation value of roll gaps on two sides, the rolling load deviation value and the roll bending force value; the method is characterized in that corresponding adjustment and compensation are carried out according to the appearance quality of a finished product produced by a steel billet, so that the first titanium billet which is rolled can be smoothly threaded and rolled, and the adjustment is generally carried out manually by an operator;
sixthly, rolling the second rolled titanium blank, and adjusting the 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 the deviation value of roll gaps on two sides, the rolling load deviation value and the bending force value; the adjustment control is also generally carried out manually by an operator;
and seventhly, after finishing titanium polishing of the last stand of the finishing mill, immediately following the second rolling, and performing rolling rhythm control on 20-25 titanium plates in one hour.
The invention breaks through the characteristic of inherent titanium-steel cross rolling, adopts a titanium loading mode of two heating furnaces, realizes the batch rolling of titanium alloy on a hot continuous rolling steel production line, directly shortens the rolling time of a titanium plate from the original 20 hours to about 10 hours, and the rolling mode is that the rolling parameters of a plurality of blocks before the production of the titanium alloy have no contrast comparability. The threading and rolling of the first titanium alloy blocks are influenced by a plurality of factors, the problems of deviation and head buckling exist in a large probability, and the probability of generating waste products is quite high. Therefore, the invention records the rolling parameters of the billet in the third step, adjusts and compensates in the sixth step and the seventh step, controls the rolling roll gap of each frame working roll of the hot continuous rolling finishing mill in real time, adjusts the deviation of two sides, corrects the deviation, controls the buckling and raising head with the head bent up and down, and mainly emphasizes on adopting the adjustment of the deviation of the roll gap of two sides of the working roll of the finishing mill, the roll bending force and the rolling force to realize smooth threading. In order to facilitate adjustment and control and effectively ensure the product quality, the inventor of the application determines the titanium plate rolling load distribution coefficient of each rack of the finishing mill through a large amount of production practice research, establishes a load distribution and roll gap calculation model of finishing rolling on the basis, and stores the load distribution and roll gap calculation model in a secondary computer database for actual production. Specifically, the load distribution and roll gap calculation model of finish rolling is as follows:
the thickness of the intermediate billet is set to be A, the thickness of the rolled finished product is set to be B,
the numbers of the finish rolling mills are respectively F1, F2, F3, F4, F5 and F6,
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 load distribution coefficients of the titanium plate rolling is set to be S, namely S is K1+ K2+ K3+ K4+ K5+ K6,
the rolling reduction of the finishing mill is calculated according to the following formula:
the rolling reduction of F1 was (a-B) × K1/S,
the rolling reduction of F2 was (a-B) × K2/S,
the rolling reduction of F3 was (a-B) × K3/S,
the rolling reduction of F4 was (a-B) × K4/S,
the rolling reduction of F5 was (a-B) × K5/S,
the rolling reduction of F6 was (a-B) × K6/S,
the roll gap of the finishing mill is calculated according to the following formula:
the outlet thickness of F1 is equal to the reduction of a-F1,
the outlet thickness of F2-the reduction of F2 of the outlet thickness of F1,
the outlet thickness of F3-the reduction of F3 of the outlet thickness of F2,
the outlet thickness of F4-the reduction of F4 of the outlet thickness of F3,
the outlet thickness of F5-the reduction of F5 of the outlet thickness of F4,
the outlet thickness of F6-the reduction of F6 of the outlet thickness of F5,
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 titanium plate rolling load distribution coefficient is a constant and is determined by the inventor of the present application through a large number of experimental trials.
For ease of understanding, the following description is given by way of example.
Such as: the thickness of the rolled product of the titanium alloy was 3.0mm, the thickness of the intermediate slab was 30mm, and the titanium plate rolling load distribution coefficient of each stand of the finishing mill is shown in table 1.
TABLE 1 titanium plate Rolling load distribution coefficients for the stands of the finishing Mill
| F1 | F2 | F3 | F4 | F5 | F6 |
| 2.8 | 1.33 | 0.687 | 0.39 | 0.22 | 0.09 |
And (3) summing the rolling load distribution coefficients of the titanium plate: s2.8 +1.33+0.687+0.39+0.22+ 0.09-5.517.
And (3) calculating the rolling reduction of the finishing mill:
the reduction of F1 was (30-3) × 2.8/5.517 was 13.7031,
the reduction of F2 was (30-3) × 1.33/5.517 was 6.5089,
the reduction of F3 was (30-3) × 0.687/5.517 was 3.3621,
the reduction of F4 was (30-3) × 0.39/5.517 was 1.9086,
the reduction of F5 was (30-3) × 0.22/5.517 was 1.0766,
the reduction of F6 was (30-3) × 0.09/5.517 was 0.4404,
calculating the roll gap of the finishing mill:
the outlet thickness of F1-30-13.7031-16.2969,
the outlet thickness of F2 is 16.3969-6.5089 is 9.7879,
the outlet thickness of F3 is 9.7879-3.3621 is 6.4257,
the outlet thickness of F4 is 6.4257-1.9086 is 4.5171,
the outlet thickness of F5 is 4.5171-1.0766 is 3.4405,
the outlet thickness of F6 was 3.4404-0.4404-3.
The present invention will be further described with reference to the following examples.
Example 1:
in the embodiment, a hot continuous rolling production line is adopted to produce a large-coil heavy titanium alloy coil TA0, 30 coils and 222.20 tons are produced at one time, and the rolling specification is as follows: the thickness × width is 3.5mm to 6.5mm × 1050mm to 1250mm, and the technique of the present invention is applied to the specific embodiment. The method comprises the following specific steps:
(1) a titanium alloy rolling roller type machine is used, and a rolling configuration is carried out on a front rack of a finish rolling finished product; f1-0.25 mm, F2-0.15 mm,
f3-0.20 mm. 6 billets were rolled.
(2) The two heating furnaces are both provided with titanium billets, and the heating furnaces and the rough rolling are both executed according to the normal titanium alloy rolling process.
(3) The final 3 specifications of the rolled steel billet are 4.0mm multiplied by 1050mm, and the two specifications of the titanium plate before rolling are 4.5mm multiplied by 1050 mm. (4) And recording rolling roll gap deviation, load deviation and roll bending force data in the process of rolling the steel billet. Fifth and sixth billet rolling data
See table 2.
(5) The rolling data of the first titanium alloy and the second titanium alloy are shown in Table 3, and although the rolling roll gap and the rolling force have large difference, the rolling roll gap and the rolling force must be ensured
The difference of the roll gaps and the difference of the rolling pressure on the two sides are basically kept unchanged relative to the billet rolling.
TABLE 2 fifth and sixth billet Rolling data of example 1
TABLE 3 Rolling data of first and second titanium alloys of example 1
The implementation effect is as follows:
in the implementation process of the embodiment 1, 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 part is stably threaded, the deviation phenomenon does not exist, a certain wave shape exists after the threading, the roll gap is inclined to a certain degree, and the micro adjustment is carried out in the rolling process of the second titanium billet. The rolling force deviation basically keeps the reference value of the last block, the situation of buckling up and down does not exist, the buckling and head rolling process is stable, the surface and plate shape quality of the titanium strip coil is good, the rolling time of the titanium strip is shortened by 8 hours, and the operation rate is improved by 10.3 percent.
Example 2:
in the embodiment, a hot continuous rolling production line is adopted to produce a large-coil heavy titanium alloy coil TA1, 23 coils and 197.8 tons are produced at one time, and the rolling specification is as follows: the thickness × width is 5.0mm to 10.0mm × 1050mm, and the technique of the present invention is applied to a specific embodiment. The method comprises the following specific steps:
(1) a titanium alloy rolling roller type machine is used, and a rolling configuration is carried out on a front rack of a finish rolling finished product; f1-0.25 mm, F2-0.15 mm,
f3-0.20 mm. 7 billets were rolled.
(2) The two heating furnaces are both provided with titanium billets, and the heating furnaces and the rough rolling are both executed according to the normal titanium alloy rolling process.
(3) The final 3 specifications of the rolled steel billet are 5.0mm multiplied by 1050mm, and the two specifications of the titanium plate before rolling are 5.0mm multiplied by 1050 mm. (4) And recording rolling roll gap deviation, load deviation and roll bending force data in the process of rolling the steel billet. Sixth and seventh billet rolling data
See table 4.
TABLE 4 sixth and seventh billet Rolling data of example 2
(5) The rolling data of the first titanium alloy and the second titanium alloy are shown in a table 5, and although the rolling gap and the rolling force have large differences, the difference value of the rolling gap and the rolling pressure on two sides is ensured to be basically unchanged.
TABLE 5 Rolling data of first and second titanium alloys 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 part is stably threaded, and the deviation phenomenon does not exist. Minor adjustments were made during the second titanium billet rolling. The rolling process is stable, the surface and plate shape quality of the titanium strip coil is good, the rolling time of the titanium plate is shortened by 10 hours, and the operation rate is improved by 13.3 percent.
Example 3:
in the embodiment, a hot continuous rolling production line is adopted to produce a large-coil heavy titanium alloy coil TA1, 20 coils and 172 tons of titanium alloy coils are produced at one time, and the rolling specification is as follows: the thickness × width is 7.0mm to 10.0mm × 1250mm, and the technique of the present invention is applied to the specific embodiment. The method comprises the following specific steps:
(1) a titanium alloy rolling roller type machine is used, and a rolling configuration is carried out on a front rack of a finish rolling finished product; f1-0.25 mm, F2-0.15 mm,
f3-0.20 mm. 6 billets were rolled.
(2) The two heating furnaces are both provided with titanium billets, and the heating furnaces and the rough rolling are both executed according to the normal titanium alloy rolling process.
(3) The specification of the product is thick, the product is produced by adopting a polishing F3/F5 frame, and the final 2 pieces of the product have the specification of 7.0mm multiplied by 1250mm and are titanium
The two specifications before plate rolling are both 7.0mm multiplied by 1250 mm.
(4) And recording rolling roll gap deviation, load deviation and roll bending force data in the process of rolling the steel billet. Fifth and sixth billet rolling data
See table 6.
(5) The rolling data of the first titanium alloy and the second titanium alloy are shown in Table 7, and although the rolling roll gap and the rolling force have large difference, the rolling roll gap and the rolling force must be ensured
The difference value of the roll gaps of the two sides and the difference value of the rolling pressure are basically kept unchanged.
TABLE 6 fifth and sixth billet rolling data of example 3
TABLE 7 Rolling data of first and second titanium alloys of example 3
The implementation effect is as follows:
in the implementation process of the embodiment 3, the head part is stably threaded, and the deviation phenomenon does not exist. Minor adjustments were made during the second titanium billet rolling. The rolling process is stable, the surface and plate shape quality of the titanium strip coil is good, the rolling time of the titanium plate is shortened by 7 hours, and the operation rate is improved by 9.6%.
Claims (2)
1. The production method of the hot continuous rolling titanium alloy plate is characterized by comprising the following steps:
arranging a small unit of 5-10 steel billets for rolling before hot continuous rolling of titanium alloy coils, wherein the working roll of a finishing mill adopts a titanium alloy rolled working roll shape, and the working roll is reset and leveled in a normal program when the roll is changed;
secondly, in the rolling process of 5-10 steel billets, rolling in a mode of 1+3, wherein the rolling speed of rough rolling R2 is 3.0-4.5 m/s, and the thickness of the intermediate billet is controlled between 30mm and 35 mm;
recording roll gap values of a transmission side and an operation side of each rack and roll gap deviation values of two sides when each steel billet is rolled, and recording rolling load deviation values and roll bending force value technical parameters of each rack of each steel billet;
after rolling of the fourth, 5-10 steel billets, extracting the working rolls of the finishing mill, preparing for installation of supporting equipment for titanium alloy production, wherein the working rolls of the finishing mill are not replaced, the working rolls rolled before are installed after preparation of relevant equipment conditions is completed, and the hydraulic cylinders of the finishing mill are not reset and calibrated, are directly pressed to level the rolls and have a hydraulic pressing function;
fifthly, adopting a titanium loading mode of two heating furnaces to roll a first rolled titanium blank; the heating furnace and the rough rolling are both executed according to a normal titanium alloy rolling process; the rolling parameters of the titanium alloy finish rolling are adjusted according to the parameters of the prior billet production, and the adjusted rolling parameters comprise one or more of the deviation value of roll gaps on two sides, the rolling load deviation value and the roll bending force value;
sixthly, rolling the second rolled titanium blank, and adjusting the 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 the deviation value of roll gaps on two sides, the rolling load deviation value and the bending force value;
and seventhly, after finishing titanium polishing of the last stand of the finishing mill, immediately following the second rolling, and performing rolling rhythm control on 20-25 titanium plates in one hour.
2. The production method of a hot continuous rolled titanium alloy sheet as claimed in claim 1, characterized in that: the load distribution and roll gap calculation model of finish rolling is as follows:
the thickness of the intermediate billet is set to be A, the thickness of the rolled finished product is set to be B,
the numbers of the finish rolling mills are respectively F1, F2, F3, F4, F5 and F6,
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 load distribution coefficients of the titanium plate rolling is set to be S, namely S is K1+ K2+ K3+ K4+ K5+ K6,
the rolling reduction of the finishing mill is calculated according to the following formula:
the rolling reduction of F1 was (a-B) × K1/S,
the rolling reduction of F2 was (a-B) × K2/S,
the rolling reduction of F3 was (a-B) × K3/S,
the rolling reduction of F4 was (a-B) × K4/S,
the rolling reduction of F5 was (a-B) × K5/S,
the rolling reduction of F6 was (a-B) × K6/S,
the roll gap of the finishing mill is calculated according to the following formula:
the outlet thickness of F1 is equal to the reduction of a-F1,
the outlet thickness of F2-the reduction of F2 of the outlet thickness of F1,
the outlet thickness of F3-the reduction of F3 of the outlet thickness of F2,
the outlet thickness of F4-the reduction of F4 of the outlet thickness of F3,
the outlet thickness of F5-the reduction of F5 of the outlet thickness of F4,
the outlet thickness of F6-the reduction of F6 of the outlet thickness of F5,
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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