CN111922083B - Method for controlling shape of titanium plate - Google Patents
Method for controlling shape of titanium plate Download PDFInfo
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- CN111922083B CN111922083B CN202010737203.4A CN202010737203A CN111922083B CN 111922083 B CN111922083 B CN 111922083B CN 202010737203 A CN202010737203 A CN 202010737203A CN 111922083 B CN111922083 B CN 111922083B
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 51
- 239000010936 titanium Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000005096 rolling process Methods 0.000 claims abstract description 138
- 230000009467 reduction Effects 0.000 claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 3
- 239000011574 phosphorus Substances 0.000 claims abstract description 3
- 239000007921 spray Substances 0.000 claims description 35
- 238000001816 cooling Methods 0.000 claims description 29
- 238000009826 distribution Methods 0.000 claims description 18
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 7
- 229910001069 Ti alloy Inorganic materials 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 9
- 238000010079 rubber tapping Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000002994 raw material Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
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- 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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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Abstract
The invention discloses a method for controlling the shape of a titanium plate, which comprises the following steps: heating a plate blank, removing phosphorus by high-pressure water, rough rolling and finish rolling, wherein the rough rolling determines the thickness of a rough rolling outlet, distributes the initial rolling reduction of each pass according to the preset initial rolling reduction of each pass, and performs seven-pass rolling on the plate blank by increasing the maximum side pressure limit of each pass of odd passes. The method can solve the problems of buckling and warping of the titanium plate and the titanium alloy in the rolling process and the phenomenon of buckling after the rolling is finished.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for controlling the shape of a titanium plate.
Background
The hot continuous rolling process is a way of producing steel, and generally uses 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 blank is required to be rolled to the required final thickness and width, but no special equipment and control system for the titanium plate exist at present. After the smooth trial rolling and model improvement of titanium and titanium alloy are completed, the main problem of the titanium plate in the hot continuous rolling line is the plate shape problem, and the following problems mainly exist:
1. the phenomenon of severe head buckling exists in the rough rolling process, and waste products are frequently caused.
2. The titanium plate has obvious tripping phenomenon after being rolled, and the tripping arch height reaches about 80mm when the titanium plate is serious, thereby causing great influence on the further processing of downstream enterprises and generating more waste products.
Disclosure of Invention
In view of the above problems, the present invention provides a method for controlling a shape of a titanium plate.
The invention realizes the above purposes by the following technical scheme:
a method for controlling the shape of a titanium plate comprises the following steps: heating a plate blank, removing phosphorus by high-pressure water, rough rolling and finish rolling, wherein the rough rolling comprises the following steps:
determining the thickness of a rough rolling outlet to be 35 mm;
and (3) carrying out seven-pass rolling on the plate blank according to the preset initial reduction distribution of each pass and by adopting a mode of increasing the maximum side pressure limit of each pass of odd passes.
Optionally, when the thickness of the slab is more than or equal to 170mm and less than 180mm, the initial reduction distribution of each pass is as follows: 46mm for the first pass, 58mm for the second pass, 50mm for the third pass, 53mm for the fourth pass, 42mm for the fifth pass, 37mm for the sixth pass and 25mm for the seventh pass; when the thickness of the plate blank is more than or equal to 180mm and less than 205mm, the distribution of the initial reduction of each pass is as follows: 45mm for the first pass, 58mm for the second pass, 49mm for the third pass, 53mm for the fourth pass, 42mm for the fifth pass, 37mm for the sixth pass and 25mm for the seventh pass; when the thickness of the slab is more than or equal to 205mm and less than or equal to 220mm, the distribution of the initial rolling reduction of each pass is as follows: 44mm for the first pass, 58mm for the second pass, 47mm for the third pass, 53mm for the fourth pass, 42mm for the fifth pass, 37mm for the sixth pass, and 25mm for the seventh pass.
Alternatively, when the total side pressure is < -5mm, the maximum side pressure for each pass is: the first pass is 5mm, the third pass is 10mm, the fifth pass is 10mm, and the seventh pass is 10 mm; when the total side pressure is more than or equal to 5mm and less than 10mm, the maximum side pressure of each pass is as follows: the first pass is 20mm, the third pass is 20mm, the fifth pass is 20mm, and the seventh pass is 15 mm; when the total side pressure is more than or equal to 10mm, the maximum side pressure of each pass is as follows: 25mm for the first pass, 30mm for the third pass, 20mm for the fifth pass and 20mm for the seventh pass; wherein, the total side pressure is equal to the width of the blank-the width of the finished product.
Optionally, the finish rolling is performed by a small reduction rate control method of balancing each stand according to the target thickness.
Alternatively, when the target thickness is < 6.0mm, the initial values of the reduction ratios of the respective stands of the finishing mill are: a1 st frame F066%, a2 nd frame F164%, a3 rd frame F260%, a 4 th frame F345%, a 5 th frame F435%, a 6 th frame F523%, a 7 th frame F619%; when the target thickness is less than or equal to 6.0mm and less than 8.0mm, the initial values of the reduction ratios of the frames of the finishing mill are as follows: a1 st rack F066%, a2 nd rack F164%, a3 rd rack F260%, a 4 th rack F350%, a 5 th rack F436%, a 6 th rack F523%, a 7 th rack F620%; when the target thickness is more than or equal to 8.0mm, the initial values of the reduction rate distribution of each frame of the finishing mill are as follows: frame 1F 066%, frame 2F 164%, frame 3F 260%, frame 4F 350%, frame 5F 437%, frame 6F 524%, frame 7F 621%.
Optionally, the finish rolling is followed by laminar cooling, wherein the laminar cooling is performed in a manner that an upstream spray valve at the downstream sprays water, a downstream spray valve does not spray water, and all front and rear side blow valves of the opened valves are opened.
Optionally, when the target thickness is < 6.0mm, 2 upstream spray valves located downstream spray water; when the target thickness is less than or equal to 6.0mm and less than 8.0mm, 3 upstream spray valves positioned at the downstream spray water; when the target thickness is more than or equal to 8.0mm, 4 upstream spray valves at the downstream spray water.
Compared with the prior art, the method for controlling the shape of the titanium plate has the following beneficial effects:
the method for controlling the shape of the titanium plate can effectively solve the problems of buckling and warping of the titanium plate and the titanium alloy in the rolling process and the phenomenon of buckling after the rolling is finished. In the titanium plate rolling process, the phenomenon of buckling and warping is avoided, the finished product is free of the phenomenon of buckling, the plate shape quality can meet the requirements of downstream users, and the phenomenon of waste products of a rolling line caused by the plate shape of the titanium plate is avoided.
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.
Drawings
Fig. 1 is a schematic view of the equipment involved in the hot continuous rolling process, in which: 1. the heating furnace comprises 4 heating furnaces and 1 trolley furnace; 2. a high-pressure water descaling box; 3. a roughing edger (VE 0); 4. a roughing flat roll mill (R0); 5. a heat-preserving cover; 6. rotary drum type crop flying shears; 7. a finishing stand (7 stands); 8. a convexity meter; 9. a width gauge; 10. a thickness gauge; 11. a flatness meter; 12. laminar cooling; 13. a coiling machine.
FIG. 2 is a schematic view of a spray valve involved in a laminar flow cooling process wherein
To representAn upper valve is arranged on the upper side of the valve,
the upper number indicates the upper valve number, e.g., 10 indicates the 10# upper valve;
the lower spraying is shown to be performed,
the lower number indicates the lower valve number, such as 11 for # 11 lower valve;
a side-blow valve is shown in the figure,
the upper number indicates the side blow valve number, as 12 indicates the 12# side blow valve.
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.
At present, the rolling method of the hot continuous rolling production line is as follows:
1. the rough rolling adopts a five-pass rolling method, and the control method of the five-pass flat roll reduction and the vertical roll side pressure in the rough rolling is as follows:
the flat roll reduction amount control method comprises the following steps: the thickness of the plate blank is 170-220 mm, the thickness of the rough rolling outlet is 38-42 mm, the rough rolling is carried out for five times, and the initial given rolling reduction of each pass of flat roll is as follows: 56mm, 53mm, 48mm, 41mm and 26mm, and calculating the final reduction of each pass by taking the given reduction of each pass as an initial condition according to the thickness of the plate blank and the thickness of the rough rolling outlet.
The vertical roll side pressure control method comprises the following steps: in the vertical roll side pressure control, the side pressure is controlled in odd passes (first, third and fifth passes), the side pressure is not controlled in even passes, the target width is used as a calculation target in each odd pass based on the slab width and the target width of a finished product, and the side pressure amount required for reaching the target width is calculated.
2. The finish rolling seven-rack reduction rate control method comprises the following steps:
the thickness of a rough rolling outlet is 38-42 mm, the target thickness of finish rolling is 4.0-10.0 mm according to the requirements of users, and the initial reduction rate (%) of seven stands F0-F6 is as follows: 76. 58, 49, 42, 37, 30 and 27, and calculating the final reduction ratio of each titanium plate of each frame according to the initial reduction ratio to obtain the target thickness.
3. The laminar cooling control method comprises the following steps: laminar cooling was not put into use.
However, when the rolling method is adopted, the buckling problem existing in the rolling process and the buckling phenomenon existing after the rolling is finished are easy to occur, and the serious situation can reach about 80 mm.
The inventor aims at the problems and optimizes and improves the steps of rough rolling and finish rolling through research. Specifically, aiming at the phenomenon of head warping caused by rough rolling, a strategy of multi-pass small reduction and small side pressure rolling is provided; aiming at the phenomenon of thread-off after the rolling is finished, a control method of adopting a small reduction rate in finish rolling and adopting a special upward spraying mode in a laminar cooling area is provided.
Firstly, a rough rolling frame adopts a small reduction and small side pressure control method, which mainly comprises the following steps:
the first step is as follows: determining the thickness of the rough rolling outlet as a determined value: 35 mm.
The second step is that: the rough rolling adopts seven passes of rolling. On the basis of seven-pass rolling, on the basis of small rolling reduction of flat roll rolling, adjusting the distribution of each pass of flat roll according to the actual head buckling condition, and adopting different initial rolling reduction distribution according to different slab thicknesses; the vertical roll rolling adopts a method of increasing the maximum side pressure limit of each pass, and different maximum side pressure limits are adopted according to different total side pressure.
According to the actual situation of buckling and warping between frames, the rolling reduction of each pass is basically balanced; properly reducing the first pass reduction; increasing the second and fourth pass rolling reduction; and reducing the reduction of the seventh pass. The distribution of specific initial rolling reduction is distinguished according to the slab thickness, and is specifically shown in table 1:
TABLE 1 distribution of initial reduction in each pass of rough rolling
And calculating the final reduction of each pass according to the initial reduction of the flat roll.
As is known, the thickness of each raw material of the titanium plate is basically stable, for example, the thickness of TA1 and TA2 raw materials is usually between 200 and 210mm, the thickness of TA3 raw materials is usually between 195 and 205mm, and the thickness of Ti3111 raw materials is usually between 170 and 180 mm. Of course, it should be understood that the foregoing titanium plate numbering, thickness ranges are exemplary only, and are not intended to limit the scope of the present invention.
The control method for increasing the maximum side pressure limit of each odd pass according to the size of the total side pressure (the total side pressure is equal to the blank width-finished product width), and when the maximum side pressure is exceeded, the control is carried out according to the maximum side pressure. The width of the finished product is controlled to be slightly wider by the method, but the finished product is not beyond the tolerance of a user (the width tolerance of the titanium plate: the width deviation range is 0-50 mm). Specifically, as shown in table 2:
TABLE 2 maximum side pressure of each pass of rough rolling
The strategy of rough rolling with multiple passes, small rolling reduction and small side pressure rolling is adopted, and the phenomenon of head warping caused by rough rolling is mainly solved. The solution mechanism is as follows:
1) the rough rolling buckle warping head is mainly caused by the fact that the elongation of the upper surface is greatly different from that of the lower surface when a titanium plate is rolled, if the elongation of the upper surface is larger than that of the lower surface, the buckling phenomenon can occur at the pass outlet, and if the elongation of the upper surface is smaller than that of the lower surface, the warping phenomenon can occur at the pass outlet, so that the reason that the elongation of the upper surface is different from that of the lower surface is as follows: different temperatures of the upper surface and the lower surface, different diameters of the upper roller and the lower roller, different friction forces of the upper surface and the lower surface (different lubrication conditions), and the like, but the factors cannot be completely eliminated in the actual production process.
2) In actual production, if a certain pressing amount is too large, the difference of the elongation rates of the upper surface and the lower surface is obviously increased, and the head buckling phenomenon is very obvious, and conversely, if the pressing amount is reduced, the difference of the elongation rates of the upper surface and the lower surface is obviously reduced, and the head buckling phenomenon is gradually and not obvious. The rolling rule is very obvious in the rolling process of the titanium plate.
3) When the side pressure is high, a dog bone is formed at the edge of the titanium plate at the outlet of the pass vertical roll, thereby increasing the thickness of the edge, and the actual rolling reduction is increased in the subsequent flat rolling process.
Based on the analysis of the three aspects, a strategy of multi-pass small reduction and small side pressure rolling is provided to solve the problem of head warping of rough rolling.
Secondly, the finish rolling adopts a small reduction rate control method for balancing all the stands as much as possible, and adopts initial reduction rate distribution according to the target thickness, which is specifically shown in table 3:
TABLE 3 distribution of initial values of reduction ratios of respective stands in finish rolling
On the basis of the initial rolling reduction, the final rolling reduction of each stand is calculated.
And thirdly, laminar cooling adopts a mode that an upstream spray valve at the downstream sprays water and a downstream spray valve does not spray water. Here, the aforementioned downstream refers to a position of the laminar cooling zone near the downstream process, for example, in fig. 1, a position near the take-up zone. And determining the number of opened upward spraying valves according to the target thickness of the finished titanium plate. When the target thickness is less than 6.0mm, opening 2 upper spray valves to spray water; when the target thickness is less than or equal to 6.0mm and less than 8.0mm, opening 3 upper spray valves to spray water; when the target thickness is more than or equal to 8.0mm, 4 upper spray valves are opened to spray water. The open top-blowing valves should be spaced apart, i.e. there should be at least one unopened top-blowing valve between two adjacent open top-blowing valves. When the upper spray valve sprays water, in order to clean up the surface water of the titanium plate, front and rear side blow valves of the opened spray valves are opened, and the number of the opened side blow valves is based on the cleaning up of the surface water of the titanium plate, for example, the front and rear side blow valves of all the opened spray valves are opened.
The finish rolling adopts a small reduction rate and is combined with a laminar cooling area to adopt a special upward spraying mode, so that the problem of the phenomenon of downward buckling can be solved. The buckling phenomenon exists after the titanium plate is finished, mainly due to the fact that cooling shrinkage is different in the cooling process, in the process that the titanium plate is cooled to the room temperature after being rolled, the shrinkage of the lower surface is large, and the shrinkage of the upper surface is small, and therefore the buckling phenomenon after cooling is caused. The solution is as follows:
1) the finish rolling adopts a rolling method with small reduction ratio, and the main purpose is to reduce the problem of nonuniform internal stress formed in the rolling process to the maximum extent, and if the nonuniform internal stress is formed in the rolling process, the phenomenon of wave or thread-off can be caused in the process of cooling to room temperature.
2) The mode that the upper spray valve sprays water and the lower spray valve does not spray water is adopted, and the main purpose is to cool the upper surface of the titanium plate at first in a laminar cooling area so as to cause the contraction of the upper surface, and the phenomenon of buckling caused by large contraction of the lower surface can be counteracted in the cooling process. The purpose of the side spraying is mainly to blow off water existing on the surface of the titanium plate and prevent uneven cooling.
Referring to fig. 2, the arrangement of the injection valve of the laminar cooling process is exemplarily shown. Wherein, the smaller the number, the closer to the upstream, and the larger the number, the closer to the downstream. As an example, the valve opening number distribution in the laminar cooling process is shown in table 4:
TABLE 4 open-valve number distribution for laminar cooling
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Example 1
This example rolled a titanium plate Ti3111 with a coil number of 99A 109001.
The specification of the blank is as follows: the thickness is 172mm, the width is 1078mm, 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 5.2mm, width 1084mm, target temperature 690 ℃.
And (3) heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 880 ℃, seven-pass rolling is adopted for rough rolling after tapping, and the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the billet thickness was 172mm, and seven initial reductions (mm) were determined to be 46, 58, 50, 53, 42, 37, and 25, respectively, according to table 1. The total side pressure is-6 mm, and according to the table 2, the maximum side pressure (mm) of the 1 st, 3 rd, 5 th and 7 th passes are respectively determined as follows: 5. 10, 10. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the finish rolling parameters:
the specification of the finish rolling finished product is as follows: the thickness is 5.2mm, and the width is 1080 mm. According to Table 3, the initial reduction (%) was 66, 64, 60, 45, 35, 23, 19, and the finish rolling data were as follows:
3) calculating a layer cooling parameter:
according to table 4, the layer cooling parameters are:
in the rolling process of the titanium plate, no obvious buckling and head warping phenomenon exists in field observation, the maximum buckling of the finished product is 10.03mm in measurement, and the plate shape quality meets the requirements of users; the actual thickness of the finished product is 5.27mm, the actual width is 1095mm, and the size meets the requirements of users.
Example 2
This example rolled a titanium sheet TA3 with a coil number of 99a 139502.
The specification of the blank is as follows: the thickness is 201mm, the width is 1138mm, and the length is 7110 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 1132mm, target temperature 690 ℃.
And (3) heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 880 ℃, seven-pass rolling is adopted for rough rolling after tapping, and the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the billet had a thickness of 201mm, and seven initial reductions (mm) were determined to be 45, 58, 49, 53, 42, 37, and 25, respectively, according to table 1. The total side pressure is 6mm, and the maximum side pressure (mm) of the 1 st, 3 rd, 5 th and 7 th passes are determined according to the table 2 as follows: 20. 20, 15. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the finish rolling parameters:
the specification of the finish rolling finished product is as follows: the thickness is 7.0mm, and the width is 1132 mm. According to Table 3, the initial reduction (%) was 66, 64, 60, 50, 36, 23, 20, and the finish rolling data were as follows:
3) calculating a layer cooling parameter:
according to table 4, the layer cooling parameters are:
in the rolling process of the titanium plate, no obvious buckling and warping phenomenon exists in field observation, the maximum buckling of the finished product is 11.70mm in measurement, and the plate shape quality meets the requirements of users; the actual thickness of the finished product is 7.11mm, the actual width is 1150mm, and the size meets the requirements of users.
Example 3
This example rolled a titanium sheet TA1, coil number 99B 100101.
The specification of the blank is as follows: the thickness is 209mm, the width is 1235mm, and the length is 8001 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: thickness 8.1mm, width 1220mm, target temperature 690 ℃.
And (3) heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 880 ℃, seven-pass rolling is adopted for rough rolling after tapping, and the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the billet thickness was 209mm, and seven initial reductions (mm) were determined to be 44, 58, 47, 53, 42, 37, and 25, respectively, according to table 1. The total side pressure is 15mm, and the maximum side pressure (mm) of the 1 st, 3 rd, 5 th and 7 th passes are determined according to the table 2 as follows: 25. 30, 20 and 20. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the finish rolling parameters:
the specification of the finish rolling finished product is as follows: the thickness is 8.1mm, and the width is 1220 mm. According to Table 3, the initial reduction (%) was 66, 64, 60, 52, 37, 24, 21, and the finish rolling data were as follows:
3) calculating a layer cooling parameter:
according to table 4, the layer cooling parameters are:
in the rolling process of the titanium plate, no obvious buckling and head warping phenomenon exists in field observation, the maximum buckling of the finished product is 8.21mm in measurement, and the plate shape quality meets the requirements of users; the actual thickness of the finished product is 8.17mm, the actual width is 1243mm, and the size meets the requirements of users.
Example 4
This example rolled a titanium sheet TA2, coil number 99B 100501.
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 1130mm, target temperature 690 ℃.
And (3) heating the titanium plate blank in a trolley furnace, wherein the target tapping temperature is 880 ℃, seven-pass rolling is adopted for rough rolling after tapping, and the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the billet thickness was 209mm, and seven initial reductions (mm) were determined to be 44, 58, 47, 53, 42, 37, and 25, respectively, according to table 1. The total side pressure is 1mm, and the maximum side pressure (mm) of the 1 st, 3 rd, 5 th and 7 th passes are determined according to the table 2 as follows: 20. 20, 15. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the finish rolling parameters:
the specification of the finish rolling finished product is as follows: thickness 4.5mm, width 1130 mm. According to Table 3, the initial reduction (%) was 66, 64, 60, 45, 35, 23, 19, and the finish rolling data were as follows:
3) calculating a layer cooling parameter:
according to table 4, the layer cooling parameters are:
in the rolling process of the titanium plate, no obvious buckling and head warping phenomenon exists in field observation, the maximum buckling of the finished product is 9.37mm in measurement, and the plate shape quality meets the requirements of users; the actual thickness of the finished product is 4.47mm, the actual width is 1155mm, and the size meets the requirements of users.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other substitutions, modifications, combinations, changes, simplifications, etc., which are made without departing from the spirit and principle of the present invention, should be construed as equivalents and included in the protection scope of the present invention.
Claims (5)
1. A method for controlling the shape of a titanium plate comprises the following steps: heating a plate blank, removing phosphorus by high-pressure water, rough rolling and finish rolling, and is characterized in that the rough rolling comprises the following steps:
determining the thickness of a rough rolling outlet to be 35 mm;
performing seven-pass rolling on the plate blank according to preset initial reduction distribution of each pass and by adopting a mode of increasing the maximum side pressure limit of each pass of odd passes;
when the thickness of the plate blank is more than or equal to 170 and less than 180mm, the distribution of the initial rolling reduction of each pass is as follows: 46mm for the first pass, 58mm for the second pass, 50mm for the third pass, 53mm for the fourth pass, 42mm for the fifth pass, 37mm for the sixth pass and 25mm for the seventh pass;
when the thickness of the plate blank is more than or equal to 180mm and less than 205mm, the distribution of the initial reduction of each pass is as follows: 45mm for the first pass, 58mm for the second pass, 49mm for the third pass, 53mm for the fourth pass, 42mm for the fifth pass, 37mm for the sixth pass and 25mm for the seventh pass;
when the thickness of the slab is more than or equal to 205mm and less than or equal to 220mm, the distribution of the initial rolling reduction of each pass is as follows: 44mm for the first pass, 58mm for the second pass, 47mm for the third pass, 53mm for the fourth pass, 42mm for the fifth pass, 37mm for the sixth pass and 25mm for the seventh pass;
when the total side pressure is less than-5 mm, the maximum side pressure of each pass is as follows: the first pass is 5mm, the third pass is 10mm, the fifth pass is 10mm, and the seventh pass is 10 mm;
when the total side pressure is more than or equal to 5mm and less than 10mm, the maximum side pressure of each pass is as follows: the first pass is 20mm, the third pass is 20mm, the fifth pass is 20mm, and the seventh pass is 15 mm;
when the total side pressure is more than or equal to 10mm, the maximum side pressure of each pass is as follows: 25mm for the first pass, 30mm for the third pass, 20mm for the fifth pass and 20mm for the seventh pass;
wherein, the total side pressure is equal to the width of the blank-the width of the finished product.
2. The method for controlling a shape of a titanium plate according to claim 1, wherein said finish rolling is performed by a method of controlling a reduction ratio of each stand in balance according to a target thickness.
3. The method for controlling a shape of a titanium plate according to claim 2, wherein when the target thickness is < 6.0mm, the initial values of the reduction ratios assigned to the respective stands of the finishing mill are: a1 st frame F066%, a2 nd frame F164%, a3 rd frame F260%, a 4 th frame F345%, a 5 th frame F435%, a 6 th frame F523%, a 7 th frame F619%;
when the target thickness is more than or equal to 6.0 and less than 8.0mm, the initial values of the reduction ratios of all the stands of the finishing mill are as follows: a1 st rack F066%, a2 nd rack F164%, a3 rd rack F260%, a 4 th rack F350%, a 5 th rack F436%, a 6 th rack F523%, a 7 th rack F620%;
when the target thickness is more than or equal to 8.0mm, the initial values of the reduction rate distribution of each frame of the finishing mill are as follows: frame 1F 066%, frame 2F 164%, frame 3F 260%, frame 4F 350%, frame 5F 437%, frame 6F 524%, frame 7F 621%.
4. The method for controlling a titanium plate shape according to claim 1, wherein said finish rolling is followed by laminar cooling using an upstream blow valve for spraying water at a downstream side, a downstream blow valve for spraying no water, and front and rear side blow valves for opening all valves.
5. The method for controlling a plate shape of a titanium plate according to claim 4, wherein when the target thickness is < 6.0mm, 2 up-spray valves located downstream spray water;
when the target thickness is less than or equal to 6.0mm and less than 8.0mm, 3 upstream spray valves positioned at the downstream spray water;
when the target thickness is more than or equal to 8.0mm, 4 upstream spray valves at the downstream spray water.
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