CN112792158B - Online heating and stacking method for titanium alloy thin plate - Google Patents
Online heating and stacking method for titanium alloy thin plate Download PDFInfo
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- CN112792158B CN112792158B CN202011488271.8A CN202011488271A CN112792158B CN 112792158 B CN112792158 B CN 112792158B CN 202011488271 A CN202011488271 A CN 202011488271A CN 112792158 B CN112792158 B CN 112792158B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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Abstract
The invention discloses an online heating, stacking and straightening method for a titanium alloy sheet, which comprises the following steps: 1. horizontally placing more than 1 titanium alloy thin plate between the stacked upper base plate and the stacked lower base plate, and contacting the titanium alloy thin plate with the surfaces of the upper base plate and the lower base plate to form a stacking and straightening package; 2. and (3) feeding the stacked and straightened package into an online heating furnace for heating, then feeding the stacked and straightened package into a straightening machine for stacking, straightening and leveling, naturally cooling the stacked and straightened package, and then opening an upper backing plate and a lower backing plate to obtain the straightened titanium alloy sheet. According to the invention, the titanium alloy sheet is placed between the stacked upper cushion plate and the stacked lower cushion plate for online heating, heat preservation and straightening, the temperature drop of the titanium alloy sheet is reduced by utilizing the heat storage and heat preservation effects of the upper cushion plate and the lower cushion plate after heating and heat preservation, the straightening and leveling effect is enhanced, meanwhile, the incoming material thickness fed into the thermal straightening machine is increased, the thermal straightening effect is further enhanced, the effective online straightening of the titanium alloy sheet is realized, the process method is simple, the efficiency is high, and the batch production is easy.
Description
Technical Field
The invention belongs to the technical field of titanium alloy sheet preparation and processing, and particularly relates to an online heating, stacking and straightening method for a titanium alloy sheet.
Background
The titanium alloy sheet has excellent characteristics such as high specific strength, high temperature resistance, excellent mechanical properties and the like, and is widely applied to the field of aerospace. However, due to the characteristics of the material, the titanium alloy sheet is easy to rebound in the production and preparation process, the Young modulus is small, and the residual stress is not uniform after hot working and heat treatment, so that the plate shape is difficult to treat.
The common plate shape processing methods of the titanium alloy sheet are two types, the first type is a pressure sizing method, and the pressure sizing method comprises vacuum furnace pressure sizing, atmospheric furnace pressure sizing and creep furnace sizing. The shape pressing and correcting method adopts a certain number of stacking modes, and the temperature is raised, kept and lowered within a certain period; the method has the disadvantages that each furnace needs a certain time, the production period is long, and the surface states of upper and lower materials and intermediate materials are different. The second type is a straightening machine leveling method, which comprises cold straightening of a straightening machine and hot straightening of the straightening machine. When the titanium alloy sheet is cold corrected by the straightener, the cold correction effect is not good because the material is easy to rebound; when the straightening machine directly carries out hot straightening, the direct hot straightening effect is not good due to poor heat storage and rapid temperature drop of the titanium alloy sheet and large thickness required by the hot straightening machine on supplied materials. The traditional straightening method of the straightener is not suitable for the leveling treatment of the titanium alloy sheet. It is necessary to develop a straightening method for the above titanium alloy thin plate.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide an online heating, stacking and straightening method for a titanium alloy thin plate, aiming at the defects of the prior art. According to the method, the titanium alloy thin plate is placed between the stacked upper cushion plate and the stacked lower cushion plate for online heating, heat preservation and straightening, the heat storage and heat preservation effects of the upper cushion plate and the lower cushion plate after heating and heat preservation are fully utilized, the temperature drop of the titanium alloy thin plate is reduced, the straightening and leveling effect is enhanced, meanwhile, the incoming material thickness fed into a hot straightening machine is increased, the hot straightening effect is further enhanced, and the effective online straightening of the titanium alloy thin plate is realized.
In order to solve the technical problems, the invention adopts the technical scheme that: an online heating and stacking method for a titanium alloy sheet is characterized by comprising the following steps:
horizontally placing more than 1 titanium alloy thin plate between an upper base plate and a lower base plate which are stacked, and contacting the surfaces of the upper base plate and the lower base plate to form a stacking and straightening package; the sizes of the upper cushion plate and the lower cushion plate are larger than that of the titanium alloy sheet;
and step two, feeding the stacked and straightened bag formed in the step one into an online heating furnace for heating, then feeding the heated and straightened bag into a straightening machine for stacking, straightening and leveling, naturally cooling the folded and straightened bag, and then opening an upper backing plate and a lower backing plate to obtain the straightened titanium alloy sheet.
According to the invention, the titanium alloy sheet is placed between the stacked upper cushion plate and the stacked lower cushion plate, then the heating and the heat preservation are carried out on line, the stacking and the leveling are carried out, the heat storage and heat preservation effects of the upper cushion plate and the lower cushion plate after the heating and the heat preservation are fully utilized, the temperature drop of the titanium alloy sheet is reduced, the straightening and leveling effect is enhanced, meanwhile, the thickness of incoming materials fed into a hot straightening machine is increased by adopting the upper cushion plate and the lower cushion plate, the hot straightening effect is further enhanced, and the effective on-line straightening of the titanium alloy sheet is realized.
The online heating and stacking method for the titanium alloy sheet is characterized in that pits and dead corners do not exist on the surface of the titanium alloy sheet in the step one, and the flatness is 5 mm/m-10 mm/m.
The online heating and stacking method for the titanium alloy sheet is characterized in that in the step one, the thickness of the titanium alloy sheet is 0.8-1.5 mm, the width of the titanium alloy sheet is 1000mm, and the length of the titanium alloy sheet is 2000mm.
The online heating and stacking method for the titanium alloy sheet is characterized in that in the step one, the upper cushion plate and the lower cushion plate are both titanium plates with the brand numbers of TA1 or TA 2.
The online heating and stacking method for the titanium alloy sheet is characterized in that in the step one, the upper cushion plate and the lower cushion plate are the same in size, the thickness of the upper cushion plate and the thickness of the lower cushion plate are both 4-6 mm, and the length and the width of the upper cushion plate and the width of the lower cushion plate are both larger than the length and the width of the corresponding titanium alloy sheet by more than 100 mm.
The online heating and stacking method for the titanium alloy sheet is characterized in that the heating temperature in the step two is 700-730 ℃, and the heat preservation time is 10-20 min. Because the recrystallization temperature of the titanium alloy is 750 ℃, the temperature is lower than 750 ℃ to heat the titanium alloy so as not to influence the structure of the titanium alloy, and if the temperature is lower than 700 ℃, the straightening effect is not good; therefore, the optimized heating temperature ensures the straightening and leveling effect, avoids adverse effects on the titanium alloy structure, and has shorter optimized heat preservation time, thereby effectively reducing the effects on the titanium alloy structure.
The online heating stack straightening method for the titanium alloy sheet is characterized in that in the step two, the stack straightening leveling is performed by reciprocating heat straightening for 1-2 times. The preferred stack leveling process avoids work hardening and tissue effects associated with multi-pass straightening.
The online heating and stacking method for the titanium alloy sheet is characterized in that the flatness of the straightened titanium alloy sheet in the step two is 2 mm/m-3 mm/m.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the titanium alloy sheet is placed between the stacked upper cushion plate and the stacked lower cushion plate for online heating, heat preservation and straightening, the heat storage and heat preservation effects of the upper cushion plate and the lower cushion plate after heating and heat preservation are fully utilized, the temperature drop of the titanium alloy sheet is reduced, the straightening and leveling effect is enhanced, meanwhile, the thickness of incoming materials fed into a hot straightening machine is increased by adopting the upper cushion plate and the lower cushion plate, the hot straightening effect is further enhanced, and the effective online straightening of the titanium alloy sheet is realized.
2. The invention utilizes the heat storage and preservation functions of the upper backing plate and the lower backing plate, enhances the straightening and leveling effect, shortens the production period and avoids the adverse effect of longer production period on the surface state of the titanium alloy sheet.
3. The invention can realize the heating, straightening and leveling of the titanium alloy sheet only by adding the upper cushion plate and the lower cushion plate, has simple and convenient operation and better effect of improving the plate shape of the titanium alloy sheet.
4. The method has the advantages of simple process, high efficiency and easy batch production.
The technical solution of the present invention is further described in detail by examples below.
Detailed Description
Example 1
The embodiment comprises the following steps:
placing 1 TC4 titanium alloy thin plate between an upper cushion plate and a lower cushion plate which are stacked, and contacting the surfaces of the upper cushion plate and the lower cushion plate to form a stacking and straightening package;
the thickness of the TC4 titanium alloy sheet is 0.8mm, the width is 1000mm, the length is 2000mm, pits and dead corners do not exist on the surface of the TC4 titanium alloy sheet, and the flatness is 10mm/m;
the upper backing plate and the lower backing plate are both TA2 titanium plates, the thickness of the upper backing plate and the thickness of the lower backing plate are both 4mm, the width of the upper backing plate and the width of the lower backing plate are both 1500mm, and the length of the upper backing plate and the length of the lower backing plate are both 6000mm;
step two, feeding the stacked straightening package formed in the step one into an online heating furnace for heating, then feeding the stacked straightening package into an eleven-roller reversible straightening machine for reciprocating thermal straightening for 1 pass, naturally cooling the stacked straightening package to room temperature after the heating is finished, and then opening an upper backing plate and a lower backing plate to obtain a straightened TC4 titanium alloy thin plate; the heating temperature is 700 ℃, the temperature tolerance is +/-15 ℃, and the heat preservation time is 10min.
The flatness of the straightened TC4 titanium alloy sheet of the embodiment is 3mm/m through detection.
Example 2
The embodiment comprises the following steps:
placing 6 TC4 titanium alloy thin plates between an upper cushion plate and a lower cushion plate which are stacked, and contacting the surfaces of the upper cushion plate and the lower cushion plate to form a stacking and straightening bag;
the thickness of the TC4 titanium alloy sheet is 1.0mm, the width is 1000mm, the length is 2000mm, pits and dead corners do not exist on the surface of the TC4 titanium alloy sheet, and the flatness is 8mm/m;
the upper backing plate and the lower backing plate are both TA1 titanium plates, the thickness of the upper backing plate and the thickness of the lower backing plate are both 5mm, the width of the upper backing plate and the width of the lower backing plate are both 1500mm, and the length of the upper backing plate and the length of the lower backing plate are both 6000mm;
step two, feeding the stacked straightening package formed in the step one into an online heating furnace for heating, then feeding the stacked straightening package into an eleven-roller reversible straightening machine for reciprocating thermal straightening for 1 pass, naturally cooling the stacked straightening package to room temperature after the heating is finished, and then opening an upper backing plate and a lower backing plate to obtain a straightened TC4 titanium alloy thin plate; the heating temperature is 715 ℃, the temperature tolerance is +/-15 ℃, and the heat preservation time is 15min.
The flatness of the straightened TC4 titanium alloy sheet of the embodiment is 2mm/m through detection.
Example 3
The embodiment comprises the following steps:
placing 5 TC4 titanium alloy thin plates between an upper cushion plate and a lower cushion plate which are stacked, and contacting the surfaces of the upper cushion plate and the lower cushion plate to form a stacking and straightening bag;
the thickness of the TC4 titanium alloy sheet is 1.5mm, the width is 1000mm, the length is 2000mm, pits and dead corners do not exist on the surface of the TC4 titanium alloy sheet, and the flatness is 5mm/m;
the upper backing plate and the lower backing plate are both TA2 titanium plates, the upper backing plate and the lower backing plate are both 6mm in thickness, 1500mm in width and 6000mm in length;
step two, feeding the stacked straightening package formed in the step one into an online heating furnace for heating, then feeding the stacked straightening package into an eleven-roller reversible straightening machine for reciprocating thermal straightening for 1 pass, naturally cooling the stacked straightening package to room temperature after the heating is finished, and then opening an upper backing plate and a lower backing plate to obtain a straightened TC4 titanium alloy thin plate; the heating temperature is 730 ℃, the temperature tolerance is +/-15 ℃, and the heat preservation time is 20min.
The flatness of the straightened TC4 titanium alloy sheet of the embodiment is 2mm/m through detection.
Example 4
The embodiment comprises the following steps:
placing 3 TC4 titanium alloy thin plates between an upper cushion plate and a lower cushion plate which are stacked, and contacting the surfaces of the upper cushion plate and the lower cushion plate to form a stacking and straightening package;
the thickness of the TC4 titanium alloy sheet is 1.5mm, the width is 1000mm, the length is 2000mm, pits and dead corners do not exist on the surface of the TC4 titanium alloy sheet, and the flatness is 10mm/m;
the upper backing plate and the lower backing plate are both TA2 titanium plates, the thickness of the upper backing plate and the thickness of the lower backing plate are both 4mm, the width of the upper backing plate and the width of the lower backing plate are both 1500mm, and the length of the upper backing plate and the length of the lower backing plate are both 6000mm;
step two, feeding the stacked straightening package formed in the step one into an online heating furnace for heating, then feeding the stacked straightening package into an eleven-roller reversible straightening machine for reciprocating thermal straightening for 2 times, naturally cooling the stacked straightening package to room temperature after the heating is finished, and then opening an upper backing plate and a lower backing plate to obtain a straightened TC4 titanium alloy thin plate; the heating temperature is 700 ℃, the temperature tolerance is +/-15 ℃, and the heat preservation time is 10min.
The flatness of the straightened TC4 titanium alloy sheet of the embodiment is 3mm/m through detection.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (3)
1. An online heating and stacking method for a titanium alloy sheet is characterized by comprising the following steps:
horizontally placing more than 1 titanium alloy thin plate between an upper base plate and a lower base plate which are stacked, and contacting the surfaces of the upper base plate and the lower base plate to form a stacking and straightening package; the sizes of the upper cushion plate and the lower cushion plate are larger than that of the titanium alloy sheet; the upper cushion plate and the lower cushion plate are both titanium plates with the brand numbers of TA1 or TA 2; the thickness of the titanium alloy thin plate is 0.8mm to 1.5mm, the width of the titanium alloy thin plate is 1000mm, and the length of the titanium alloy thin plate is 2000mm; the upper cushion plate and the lower cushion plate are identical in size, the thickness of each of the upper cushion plate and the lower cushion plate is 4-6 mm, and the length and the width of each of the upper cushion plate and the lower cushion plate are larger than those of the corresponding titanium alloy thin plate by more than 100 mm;
step two, feeding the stacked and straightened bag formed in the step one into an online heating furnace for heating, then feeding the heated and straightened bag into a straightening machine for stacking, straightening and leveling, naturally cooling the folded and straightened bag, and then opening an upper backing plate and a lower backing plate to obtain a straightened titanium alloy sheet; the heating temperature is 700-730 ℃, and the heat preservation time is 10-20min; the stack straightening leveling is reciprocating heat straightening 1~2 passes.
2. The on-line heating, stacking and straightening method for the titanium alloy sheet as claimed in claim 1, wherein in the first step, the surface of the titanium alloy sheet is free of pits and dead corners, and the flatness is 5mm/m to 10mm/m.
3. The on-line heating and stacking method for the titanium alloy sheets as recited in claim 1, wherein the flatness of the titanium alloy sheets after the straightening in the second step is 2mm/m to 3mm/m.
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| CN202011488271.8A CN112792158B (en) | 2020-12-16 | 2020-12-16 | Online heating and stacking method for titanium alloy thin plate |
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| CN202011488271.8A CN112792158B (en) | 2020-12-16 | 2020-12-16 | Online heating and stacking method for titanium alloy thin plate |
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| CN112792158B true CN112792158B (en) | 2023-04-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO1986003435A1 (en) * | 1984-12-03 | 1986-06-19 | Kawasaki Steel Corporation | Method of correcting warping of two-layer clad metal plate |
| CN102861788B (en) * | 2012-10-18 | 2015-01-07 | 西部钛业有限责任公司 | Hot shaping method of large-specification titanium plate |
| CN203330179U (en) * | 2013-06-18 | 2013-12-11 | 西部钛业有限责任公司 | Pure titanium sheet straightening device |
| CN103447296B (en) * | 2013-08-21 | 2016-03-02 | 洛阳双瑞精铸钛业有限公司 | A kind of preparation method of Ti60 latten |
| CN103861892B (en) * | 2014-03-27 | 2016-01-06 | 西部钛业有限责任公司 | A kind of compound shaping method of wide magnesium alloy thin plate |
| CN108817132A (en) * | 2018-04-08 | 2018-11-16 | 洛阳双瑞精铸钛业有限公司 | A kind of warm method for aligning of pure titanium and low-intensity titanium alloy sheet |
| CN110639976B (en) * | 2019-09-27 | 2021-08-13 | 攀钢集团攀枝花钛材有限公司江油分公司 | Solid solution straightening method for titanium alloy plate |
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