CN112122340A - Process method for improving material yield of cold-rolled titanium strip coil - Google Patents
Process method for improving material yield of cold-rolled titanium strip coil Download PDFInfo
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- CN112122340A CN112122340A CN202010719345.8A CN202010719345A CN112122340A CN 112122340 A CN112122340 A CN 112122340A CN 202010719345 A CN202010719345 A CN 202010719345A CN 112122340 A CN112122340 A CN 112122340A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
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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
- B21B2001/221—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 by cold-rolling
-
- 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
- B21B2001/225—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 by hot-rolling
Abstract
The invention relates to a process method for improving the material yield of a cold-rolled titanium strip coil, which takes the weight of the head and tail non-rolled sections of the cold-rolled titanium strip coil as an entry point, and adopts a process method of butt-welding a plurality of hot-rolled titanium strips and welding connecting strips head and tail, compared with the traditional single-coil production method, the thickness of the head and tail non-rolled sections of the cold-rolled titanium strip coil can be reduced by 50-80%, so that the purposes of reducing the weight and the specific gravity of the head and tail non-rolled sections of the titanium strip coil are achieved, the material yield of the plate blank to the finished cold-rolled titanium strip coil can be improved by more than 5%, the head and tail butt-welded connecting strips can be repeatedly used, compared with the prior art, the material yield of the cold-rolled titanium.
Description
Technical Field
The invention relates to the technical field of titanium material processing, in particular to a process method for improving the material yield of a cold-rolled titanium strip coil.
Background
The cold-rolled titanium strip coil has uniform thickness, attractive surface quality, batch and stable production, good corrosion resistance and forming and welding performance, and is widely applied to the fields of petroleum, chemical engineering, seawater desalination, nuclear power and the like. After a titanium metal plate blank is subjected to hot rolling, a hot rolled coil with the thickness of about 4.0mm is generally obtained, and then in the production process of performing shot blasting, pickling, annealing and cold rolling to a finished product thickness coil, sections with head and tail thickness unqualified are required to be cut off except for intangible loss and trimming loss, wherein the sections comprise an unrolled section and a transition strip section; and the thickness of the non-rolled section is generally the initial thickness of the hot coil, the length of the non-rolled section is the sum of the length of a curling shaft area at the head and the tail of the coil and the length from the curling shaft to a roller, and the head and the tail of the coil are 12-15 m respectively.
On the premise of certain weight of the plate blank, the smaller the weight of the head and tail non-rolled sections of the strip coil is, the higher the material yield of the cold-rolled strip coil from the plate blank to a finished product is, and otherwise, the lower the material yield is. At present, a cold-rolled steel strip coil is manufactured into a blank by adopting a continuous casting method, the weight of the blank can reach 30-60 tons, and the specific gravity of a head and tail non-rolled section is small, so that the material yield of the cold-rolled steel strip coil is high and can reach 92-96%.
In the prior art, a cold-rolled titanium strip coil is produced by adopting a single-coil rolling mode, titanium is an active metal, needs to be smelted and made into a blank under the protection of vacuum or inert atmosphere, and cannot be continuously cast into a blank under the atmospheric environment like steel, so that the single weight of the plate blank is generally 5-8 tons under the limitation of smelting technology and equipment, and the material yield of the cold-rolled titanium strip coil is lower and generally ranges from 80% to 85% due to the fact that the plate blank is small in weight and the head and tail of a non-rolled section are high in occupied ratio.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a process method for improving the material yield of a cold-rolled titanium strip coil, compared with the traditional method, the process method has the advantages that on the basis of the existing equipment such as titanium smelting and rolling, the weight and the specific gravity of the head and tail non-rolled sections are reduced through process technology innovation, the material yield of the cold-rolled titanium strip coil is improved, the production cost is obviously reduced, and the market popularization and application of the cold-rolled titanium strip coil are facilitated.
In order to achieve the purpose, the invention adopts the technical scheme that: a process method for improving the material yield of a cold-rolled titanium strip coil mainly comprises the steps of plate blank preparation, hot-coil rolling, cold-coil rolling, heat treatment and finishing slitting, wherein after the hot-coil rolling, a plurality of hot-rolled titanium strips are subjected to butt-joint tailor-welding, a connecting band is welded to the head and the tail of each tailor-welded titanium strip, and then the cold-coil rolling and subsequent process flows are carried out.
Preferably, 2-4 hot-rolled titanium coils are butt-jointed and spliced end to end, and the length of the connecting belt is more than or equal to 15 m; the thickness difference of adjacent tailor-welded titanium coils or connecting bands is less than or equal to 1mm, and the diameter of the tailor-welded titanium coils is smaller than the maximum allowable diameter of the cold rolling mill.
The cold coil rolling and heat treatment process comprises the following steps: performing one-pass cold rolling on the spliced and welded titanium coil by using a cold rolling mill, and rolling the rest areas to a one-pass target thickness D1 except for the head-tail connecting belt and the spliced and welded seam positions, wherein the deformation rate of the rolling pass is more than or equal to 50%; then degreasing, cutting and annealing heat treatment are carried out, and a reusable head-tail connecting belt and a titanium belt coil with the thickness of D1 are obtained; and then carrying out finish rolling, degreasing and annealing heat treatment on the cold-rolled titanium strip coil with the thickness of D1.
And the finishing and cutting process comprises the steps of correcting the shape of the cold-rolled titanium strip coil after heat treatment, cutting edges and cutting the head and the tail of the cold-rolled titanium strip coil to obtain a finished cold-rolled titanium strip coil with the thickness meeting the tolerance requirement.
The hot coil rolling process comprises the following steps: and rolling the titanium plate blank by adopting a hot rolling mill group, and carrying out annealing and acid pickling treatment to obtain the hot-rolled titanium coil.
According to the characteristics of the production process flow of the cold-rolled titanium strip coil and the characteristics of production line equipment, technological innovation is carried out on the basis of the existing equipment, the weight of the non-rolled sections of the head and the tail of the titanium strip coil is reduced as an entry point, and the material yield of the cold-rolled titanium strip coil is remarkably improved by adopting the process method of butt-splicing welding the head and the tail of the hot-rolled titanium strip coil and welding the connecting band, so that the cold-rolled titanium strip coil has the following innovation points and advantages:
(1) the process route is novel, and the operation is simple and convenient: the method of the invention does not need to increase investment for equipment, and can solve the problem of low material yield of the cold-rolled titanium strip coil caused by small single weight of the titanium plate blank through process optimization on the basis of the existing equipment for titanium smelting, rolling and the like, thereby realizing the batch stable production of the cold-rolled titanium strip coil with high material yield.
(2) Before the cold rolling of one rolling process, a plurality of hot rolled titanium coils are butt-jointed and welded end to end, connecting belts are welded end to end, and slitting and finished product rolling are carried out after the cold rolling process.
(3) The method of the invention can not only greatly improve the material yield of the cold-rolled titanium strip coil, but also can repeatedly use the splicing welding connecting belt at the head and the tail, thereby obviously reducing the production cost of the cold-rolled titanium strip coil.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The invention relates to a process method for improving the material yield of a cold-rolled titanium strip coil, which comprises the following specific steps:
firstly, rolling the titanium plate blank by using a hot rolling unit, and carrying out annealing and acid pickling treatment to obtain a hot-rolled titanium coil.
Secondly, butt-welding 2-4 hot-rolled titanium coils end to end, and welding 1 connecting belt to the ends of the titanium coils respectively after the butt-welding is finished, wherein the length of the connecting belt is more than or equal to 15 m; the thickness difference of adjacent tailor-welded titanium coils or connecting bands is less than or equal to 1mm so as to obtain enough weld strength, and the diameter of the tailor-welded titanium coils is smaller than the maximum allowable diameter of the cold rolling mill.
And thirdly, performing one-pass cold rolling on the spliced and welded titanium coil by using a cold rolling mill, wherein the rest areas except the head and tail connecting belts and the spliced and welded seam are all rolled to a one-pass target thickness D1, and the deformation rate of the rolling pass is more than or equal to 50%.
Fourthly, degreasing, cutting and annealing heat treatment are carried out on the semi-finished cold-rolled titanium strip coil; and during slitting, shearing the splicing welding position to obtain a reusable head and tail connecting belt and a titanium strip coil with the thickness of D1.
And fifthly, rolling a finished product, degreasing and annealing the cold-rolled titanium strip coil.
And sixthly, performing plate shape correction, trimming and head and tail cutting treatment on the annealed cold-rolled titanium strip coil to obtain a cold-rolled titanium strip coil finished product with the thickness meeting the tolerance requirement.
In order to further illustrate the technical solution and effect of the present invention, several sets of examples and comparative examples are given below, wherein examples 1-3 are the process of the present invention, and comparative examples 1-3 are the single-coil rolling process of the prior art.
Example 1: rolling the titanium plate blank by using a hot rolling mill group, wherein the thickness of the plate blank is 190mm, the width is 1280mm, and the weight is 5000kg, and carrying out annealing, acid pickling and edge cutting treatment to obtain a hot rolled titanium coil with the specification of 4.0 x 1250 x cm; butt-welding the head and the tail of the 4 hot-rolled titanium coils, and welding 1 connecting belt with the length of 15m and the thickness of 4.0mm on the head and the tail of each titanium coil after the butt-welding is finished; cold rolling the hot-rolled titanium coil to 1.2mm by using a cold rolling mill, wherein the deformation rate of the rolling process is 70%, degreasing, cutting off along a welding seam to obtain 4 semi-finished cold-rolled titanium coil strips and 2 connecting strips, and then carrying out heat treatment on the semi-finished cold-rolled titanium coil strips; rolling the titanium coil to the thickness of a finished product of 0.6mm by adopting a twenty-high roll mill, degreasing, annealing heat treatment, plate shape correction, trimming and head and tail slitting treatment are carried out on the titanium coil to obtain 4 finished cold-rolled titanium coil products of 0.6 x 1220 x cm, and the material yield of the plate blank to the finished titanium coil products is 88%. Wherein the thickness of each titanium coil head and tail non-rolled section is 1.2mm, the length of one side is 12m, and the total weight of the head and tail non-rolled sections is 162kg and accounts for 3.24 percent of the weight of the plate blank.
Comparative example 1: the titanium plate blank with the same specification and weight as those in the example 1 is used, the single-coil rolling method is adopted to produce the finished product of the cold-rolled titanium strip coil with the specification of 0.6 x 1220 x cm, the process flow and the method are the same as those in the example 1 except that the hot-rolled titanium strip coil is not subjected to head-tail butt welding and welding connecting strips before the cold rolling, and the yield of the final plate blank to the finished product of the titanium strip coil is 81%. Wherein the thickness of each titanium coil head and tail non-rolled section is 4.0mm, the length of one side is 12m, and the total weight of the head and tail non-rolled sections is 540kg, which accounts for 10.8% of the weight of the plate blank.
It can be seen from this that: compared with the comparative example 1, the thickness of the head-tail non-rolled section is reduced from 4.0mm to 1.2mm, the total weight of the head-tail non-rolled section is reduced from 540kg to 162kg, and the weight proportion of the head-tail non-rolled section in the slab is reduced from 10.8% to 3.24% by the process method of head-tail butt welding and connecting belt welding of the hot-rolled titanium coil in the example 1. Because the weight and the specific gravity of the head and the tail of the titanium strip coil are greatly reduced, the material yield of the cold-rolled titanium strip coil of the embodiment 1 is improved by 7 percent compared with that of the finished product of the comparative example 1, and the head and the tail connecting strips can be repeatedly used, so that the production cost is obviously reduced.
Example 2: rolling the titanium plate blank by using a hot rolling mill group, wherein the thickness of the plate blank is 190mm, the width is 1280mm, and the weight is 6500kg, and carrying out annealing, acid pickling and edge cutting treatment to obtain a hot rolled titanium coil with the specification of 4.0 x 1250 x cm; butt-welding the head and the tail of the 3 hot-rolled titanium coils, and welding 1 connecting belt with the length of 16m and the thickness of 3.0mm respectively at the head and the tail of the titanium coils after the butt-welding is finished; cold rolling the hot-rolled titanium coil to 1.2mm by using a cold rolling mill, wherein the deformation rate of the rolling process is 70%, degreasing, cutting off along a welding seam to obtain 3 semi-finished cold-rolled titanium coil strips and 2 connecting strips, and then carrying out heat treatment on the semi-finished cold-rolled titanium coil strips; rolling the titanium coil to the thickness of a finished product of 0.6mm by adopting a twenty-high roll mill, degreasing, annealing heat treatment, plate shape correction, trimming and head and tail slitting treatment are carried out on the titanium coil to obtain 3 finished cold-rolled titanium coil products of 0.6 x 1220 x cm, and the material yield of the plate blank to the finished titanium coil products is 89%. Wherein the thickness of each titanium coil head and tail non-rolled section is 1.2mm, the length of one side is 13m, and the total weight of the head and tail non-rolled sections is 176kg, which accounts for 2.71 percent of the weight of the plate blank.
Comparative example 2: the titanium plate blank with the same specification and weight as those in the example 2 is used, the single-coil rolling method is adopted to produce the finished product of the cold-rolled titanium strip coil with the specification of 0.6 x 1220 x cm, the process flow and the method are the same as those in the example 2 except that the hot-rolled titanium strip coil is not subjected to head-tail butt welding and welding connection strips before the cold rolling, and the yield of the final plate blank to the finished product of the titanium strip coil is 83%. The thickness of each titanium coil head and tail non-rolled section is 4.0mm, the length of one side is 13m, the total weight of the head and tail non-rolled sections is 585kg, and the weight of the titanium coil head and tail non-rolled sections accounts for 9% of the weight of the plate blank.
It can be seen from this that: compared with the comparative example 2, the thickness of the head-tail non-rolled section is reduced from 4.0mm to 1.2mm, the total weight of the head-tail non-rolled section is reduced from 585kg to 176kg, and the weight proportion of the head-tail non-rolled section in the plate blank is reduced from 9% to 2.71%. Because the weight and the specific gravity of the head and the tail of the titanium strip coil are greatly reduced, the material yield of the cold-rolled titanium strip coil of the embodiment 2 is improved by 6 percent compared with that of the finished product of the comparative example 2, and the head and the tail connecting strips can be repeatedly used, so that the production cost is obviously reduced.
Example 3: rolling the titanium plate blank by using a hot rolling mill group, wherein the thickness of the plate blank is 190mm, the width of the plate blank is 1280mm, and the weight of the plate blank is 8000kg, and carrying out annealing, acid pickling and edge cutting treatment to obtain a hot rolled titanium coil with the specification of 4.0 x 1250 x cm; butt-welding 2 hot-rolled titanium coils end to end, and welding 1 connecting belt with the length of 16m and the thickness of 3.5mm on each end of the titanium coils after the butt-welding is finished; cold rolling the hot-rolled titanium coil to 1.0mm by using a cold rolling mill, wherein the deformation rate of a rolling process is 75%, degreasing, cutting the degreased titanium coil along a welding seam to obtain 2 semi-finished cold-rolled titanium coil coils and 2 connecting strips, and then carrying out heat treatment on the semi-finished cold-rolled titanium coil coils; rolling the titanium coil to the thickness of a finished product of 0.5mm by adopting a twenty-high roll mill, degreasing, annealing heat treatment, plate shape correction, trimming and head and tail slitting treatment are carried out on the titanium coil to obtain 2 finished cold-rolled titanium coil products of 0.5 x 1220 x cm, and the material yield of the plate blank to the finished titanium coil products is 90%. Wherein the thickness of each titanium coil head and tail non-rolled section is 1.0mm, the length of one side is 13m, and the total weight of the head and tail non-rolled sections is 146kg and accounts for 1.83 percent of the weight of the plate blank.
Comparative example 3: the titanium plate blank with the same specification and weight as those in the example 3 is used, the single-coil rolling method is adopted to produce the finished product of the cold-rolled titanium strip coil with the specification of 0.5 x 1220 x cm, the process flow and the method are the same as those in the example 3 except that the hot-rolled titanium strip coil is not subjected to head-tail butt welding and welding connection strips before the cold rolling, and the yield of the finished product of the plate blank to the finished product of the titanium strip coil is 85%. The thickness of each titanium coil head and tail non-rolled section is 4.0mm, the length of one side is 13m, the total weight of the head and tail non-rolled sections is 585kg, and the weight of the titanium coil head and tail non-rolled sections accounts for 7.31 percent of the weight of the plate blank.
It can be seen from this that: compared with the comparative example 3, the thickness of the head-tail non-rolled section is reduced to 1.0mm from 4.0mm by the process method of head-tail butt welding and connecting belt welding of the hot-rolled titanium coil in the example 3, the total weight of the head-tail non-rolled section is reduced to 146kg from 585kg, and the weight proportion of the head-tail non-rolled section in the plate blank is reduced to 1.83% from 7.31%. Because the weight and the specific gravity of the head and the tail of the titanium strip coil are greatly reduced, the material yield of the cold-rolled titanium strip coil of the embodiment 3 is improved by 5 percent compared with the finished product of the comparative example 3, and the head and the tail connecting strips can be repeatedly used, thereby obviously reducing the production cost.
In conclusion, through optimization of the process method, the problem that the material yield of the cold-rolled titanium strip coil is low due to small single weight of a titanium plate blank can be solved without increasing equipment investment by butt-welding the heads and the tails of a plurality of hot-rolled titanium strips and welding the connecting bands head and the tails before the cold-rolled titanium strip is subjected to head-to-tail butt joint, and batch stable production of the cold-rolled titanium strip coil with high material yield is realized.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A technological method for improving the material yield of a cold-rolled titanium strip coil mainly comprises the steps of plate blank preparation, hot-coil rolling, cold-coil rolling, heat treatment and finishing slitting.
2. The process method for improving the material yield of the cold-rolled titanium strip coil as claimed in claim 1, wherein preferably 2-4 hot-rolled titanium strips are butt-welded end to end, and the length of the connecting strip is more than or equal to 15 m; the thickness difference of adjacent tailor-welded titanium coils or connecting bands is less than or equal to 1mm, and the diameter of the tailor-welded titanium coils is smaller than the maximum allowable diameter of the cold rolling mill.
3. The process method for improving the material yield of the cold-rolled titanium strip coil as claimed in claim 1, wherein the cold-rolled rolling and heat treatment process comprises: performing one-pass cold rolling on the spliced and welded titanium coil by using a cold rolling mill, and rolling the rest areas to a one-pass target thickness D1 except for the head-tail connecting belt and the spliced and welded seam positions, wherein the deformation rate of the rolling pass is more than or equal to 50%; then degreasing, cutting and annealing heat treatment are carried out, and a reusable head-tail connecting belt and a titanium belt coil with the thickness of D1 are obtained; and then carrying out finish rolling, degreasing and annealing heat treatment on the cold-rolled titanium strip coil with the thickness of D1.
4. The process method for improving the material yield of the cold-rolled titanium strip coil as claimed in claim 1, wherein the finishing and slitting process comprises the steps of straightening the plate shape, trimming and head-to-tail slitting of the cold-rolled titanium strip coil after heat treatment to obtain the finished cold-rolled titanium strip coil with the thickness meeting the tolerance requirement.
5. The process method for improving the material yield of the cold-rolled titanium strip coil as claimed in claim 1, wherein the hot-coil rolling process comprises the following steps: and rolling the titanium plate blank by adopting a hot rolling mill group, and carrying out annealing and acid pickling treatment to obtain the hot-rolled titanium coil.
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| CN202010719345.8A CN112122340A (en) | 2020-07-23 | 2020-07-23 | Process method for improving material yield of cold-rolled titanium strip coil |
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| WO2023036206A1 (en) * | 2021-09-08 | 2023-03-16 | 洛阳双瑞精铸钛业有限公司 | Preparation method for titanium metal bipolar plate substrate of hydrogen fuel cell |
| CN115476116A (en) * | 2022-09-19 | 2022-12-16 | 西北有色金属研究院 | Preparation method of ultra-long titanium alloy plate |
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