CN112044982B - Vacuum creep heating leveling treatment method for titanium and titanium alloy sheet thin plate - Google Patents
Vacuum creep heating leveling treatment method for titanium and titanium alloy sheet thin plate Download PDFInfo
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- CN112044982B CN112044982B CN202010744389.6A CN202010744389A CN112044982B CN 112044982 B CN112044982 B CN 112044982B CN 202010744389 A CN202010744389 A CN 202010744389A CN 112044982 B CN112044982 B CN 112044982B
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a vacuum creep heating leveling treatment method for titanium and titanium alloy sheet thin plates, which comprises the following steps: placing a shape correcting base plate subjected to sand blasting on the platform surface of the base plate of the annealing furnace, and completely stacking a first single titanium and titanium alloy sheet-shaped thin plate on the sand blasting surface of the shape correcting base plate; superposing a sand blasting base plate on a first single sheet of titanium and titanium alloy sheet-shaped thin plate; stacking a second single titanium and titanium alloy sheet-shaped thin plate on the sand blasting base plate; repeating the step 2 and the step 3 until the height of the stacked plate stack reaches a preset height, and then placing a shape correction pressing plate with a downward sand blasting surface on the top of the plate stack; pushing the plate stack on the table top of the furnace chassis to a furnace chamber, vacuumizing the furnace chamber of the annealing furnace, and performing thermal leveling treatment by adopting gradient heating, heat preservation and cooling processes to obtain leveled titanium and titanium alloy sheet thin plates. The method of the invention can prevent the plates above and below the titanium and the titanium alloy from being adhered with the titanium and the titanium alloy, and the plates are easy to separate after heat treatment, thereby greatly improving the yield.
Description
Technical Field
The invention belongs to the technical field of leveling of titanium and titanium alloy sheets, and particularly relates to a vacuum creep heating leveling method for titanium and titanium alloy sheet-shaped sheets.
Background
Titanium and titanium alloy have the characteristics of small specific gravity, high specific strength, low elastic modulus and the like, so that the titanium and titanium alloy sheet material has more complicated working procedures and passes than a medium plate in the production process, and the deformation unevenness and the warping degree are larger, so that the titanium and titanium alloy sheet material can be used only by leveling. Leveling is particularly difficult due to the high strength and resilience of titanium and titanium alloys at room temperature due to their properties. The existing creep deformation correction method for titanium and titanium alloy plates is to stack the plates to be leveled orderly, apply a certain pressure above the stack, heat the stack to a certain temperature to soften and level the plates and keep the plates for a period of time, so that the residual stress in the plates is released to achieve the purpose of leveling. However, the biggest problems of the shape correction of the titanium and titanium alloy thin plate are as follows: the low-temperature leveling effect is poor in quality, the sheets after high-temperature leveling are easy to adhere and difficult to separate, and the yield is extremely low. Therefore, this leveling method is not basically used for the sheet-like thin plate material of titanium and titanium alloy. The leveling of the coiled sheet is realized by repeatedly bending the coiled sheet on a tension strip straightening machine, in addition, the length dimension of the material is required to be long enough and must be coiled between two tension rollers, generally, the leveling can be realized only by a strip material with the length being at least more than 15 meters, and the leveled sheet has certain internal stress through the tension leveling process, and certain resilience can be generated after the sheet is placed for a period of time, so that the accurate re-cutting processing of complex shapes is difficult to perform.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a vacuum creep heating leveling method for titanium and titanium alloy sheet-shaped thin plates.
The technical problem to be solved by the invention is realized by the following technical scheme:
a vacuum creep hot leveling treatment method for titanium and titanium alloy sheet-shaped thin plates comprises the following steps:
step 1: placing a shape correcting base plate with a sand blasting surface on the upper surface on the platform surface of the base plate of the annealing furnace, and completely stacking a first single titanium and titanium alloy sheet-shaped thin plate on the sand blasting surface of the shape correcting base plate;
step 2: superposing a sand blasting base plate with the upper surface and the lower surface both being sand blasting surfaces on the first single titanium and titanium alloy sheet-shaped thin plate, wherein the sand blasting base plate completely covers the first single titanium and titanium alloy sheet-shaped thin plate;
and step 3: completely overlapping a second single sheet of titanium and titanium alloy sheet-shaped thin plate on the sand blasting backing plate;
and 4, step 4: repeating the step 2 and the step 3 until the height of the stacked plate stack reaches a preset height, and then placing a shape correction pressing plate on the top of the plate stack, wherein the shape correction pressing plate completely covers the top of the plate stack; the downward bottom surface of the shape correcting pressure plate is a sand blasting surface; wherein the preset height is not higher than the height of the effective heating zone of the furnace chamber of the annealing furnace;
and 5: pushing the plate stack on the platform surface of the chassis of the annealing furnace to a furnace chamber, vacuumizing the furnace chamber, wherein the vacuum degree is not less than 10 - 2 And (3) maintaining the pressure for 30-35 min, heating to 220-250 ℃, preserving the heat for 30-35 min, then heating to 550-780 ℃, preserving the heat for 280-480 min, cooling to 180-200 ℃ in a vacuum environment, introducing argon, cooling to the temperature lower than 50 ℃, and discharging to obtain the leveled titanium and titanium alloy sheet.
Furthermore, the roughness of the sand spraying surfaces of the sizing bottom plate, the sand spraying base plate and the sizing press plate is larger than 2.5 microns.
Further, the unevenness of the sizing bottom plate, the sand blasting base plate and the sizing pressure plate is not more than 3 mm/m.
Further, the thickness of the first single sheet of titanium and titanium alloy sheet-shaped thin plate material and the thickness of the second single sheet of titanium and titanium alloy sheet-shaped thin plate material are both smaller than 0.8 mm.
The invention has the beneficial effects that:
according to the invention, the titanium and titanium alloy sheet-shaped thin plate is stacked between the sand blasting surfaces of the two layers of the thin plate, so that internal stress is released after the heat treatment, and the titanium and titanium alloy sheet-shaped thin plate is clamped between the sand blasting surfaces; tension is not applied in the whole leveling process, internal stress is fully released, so that the leveled thin plate does not generate rebound warping after being placed for a period of time, and the requirement for precise re-cutting processing can be completely met.
Drawings
Fig. 1 is a schematic view of the stacking structure of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a vacuum creep hot leveling method for a pure titanium sheet, wherein the length of the pure titanium sheet is 420mm, the width of the pure titanium sheet is 400mm, and the thickness of the pure titanium sheet is 0.1mm, and the method specifically includes the following steps:
step 1: placing a flat sizing bottom plate with the upper surface being a sand blasting surface and the roughness of the sand blasting surface being more than 2.5 mu m on the surface of the base plate of the annealing furnace, and completely stacking a first single pure titanium sheet to be leveled on the sand blasting surface of the sizing bottom plate, wherein the first single pure titanium sheet is completely positioned on the sand blasting surface of the sizing bottom plate, namely the length and the width of the sizing bottom plate are not less than the length and the width of the first single pure titanium sheet.
The thickness of the correcting bottom plate is not less than 25mm, the unevenness is not more than 3mm/m, and the correcting bottom plate is made of carbon steel or stainless steel.
Step 2: and placing a flat sand blasting base plate with the upper surface and the lower surface both being sand blasting surfaces and the roughness of the sand blasting surfaces being more than 2.5 mu m on the first single-piece pure titanium sheet-shaped thin plate, wherein the sand blasting base plate completely covers the first single-piece pure titanium sheet-shaped thin plate, namely the length and the width of the sand blasting base plate are not less than those of the pure titanium sheet-shaped thin plate.
The thickness of the sand blasting cushion plate is 2-3 mm, the unevenness is not more than 3mm/m, and the material is any one of carbon steel or stainless steel.
And step 3: and completely overlapping a second single sheet of pure titanium sheet to be leveled on the sand blasting backing plate, wherein the length and the width of the second single sheet of pure titanium sheet are not more than those of the sand blasting backing plate.
And 4, step 4: repeating the processes of the step 2 and the step 3 until the height of the stacked plate stack reaches a preset height, and then placing a flat shape-correcting pressing plate on the top of the plate stack; the downward bottom surface of the sizing press plate is a sand blasting surface, and the roughness of the sand blasting surface is more than 2.5 mu m; the preset height is not higher than the effective heating area of the furnace chamber of the annealing furnace, and more pure titanium sheet thin plates can be prevented from being placed as far as possible on the premise that the height of the effective heating area is not exceeded, so that the working efficiency is improved.
Further, the length and the width of the correction pressing plate are not less than those of the pure titanium sheet thin plate, namely the correction pressing plate completely covers the top of the plate stack; the thickness of the correction pressing plate is 10-25 mm, the unevenness is not more than 3mm/m, and the material is any one of carbon steel or stainless steel.
And 5: pushing the plate stack stacked on the base plate table-board of the annealing furnace to a furnace chamber, closing the furnace door, and vacuumizing the furnace chamber of the annealing furnace until the vacuum degree is not lower than 10 -2 Maintaining the pressure in the furnace for 30min, heating to 200 deg.C, maintaining the temperature for 30min, and maintaining the vacuum degree in the furnace at 10 -2 And (4) heating to 560 ℃ under MPa, keeping the temperature for 300min, cooling to 200 ℃ in a vacuum environment, introducing argon, cooling to below 50 ℃, and discharging to obtain a pure titanium sheet with the thickness of 0.1mm, the width of 400mm, the length of 420mm and the unevenness of 3 mm/m.
Example 2
The embodiment of the invention provides a vacuum creep heating leveling method for a Ti6Al4V titanium alloy sheet-shaped thin plate, wherein the Ti6Al4V titanium alloy sheet-shaped thin plate has the length of 500mm, the width of 500mm and the thickness of 0.2mm, and the processing method specifically comprises the following steps:
step 1: placing a flat shape-correcting bottom plate with the upper surface being a sand blasting surface and the roughness of the sand blasting surface being more than 2.5 mu m on the surface of the base plate of the annealing furnace, and stacking a first Ti6Al4V titanium alloy sheet-shaped thin plate to be leveled on the sand blasting surface of the shape-correcting bottom plate; the first single Ti6Al4V titanium alloy sheet-shaped thin plate is entirely positioned on the sand blasting surface of the shape correction base plate, namely the length and the width of the shape correction base plate are not less than those of the first single Ti6Al4V titanium alloy sheet-shaped thin plate.
The thickness of the correcting bottom plate is not less than 25mm, the unevenness is not more than 1mm/m, and the correcting bottom plate is made of any one of carbon steel or stainless steel.
Step 2: and placing a flat sand blasting liner plate, the upper surface and the lower surface of which are sand blasting surfaces and the roughness of which is more than 2.5 mu m, on the first single Ti6Al4V titanium alloy sheet-shaped thin plate, wherein the sand blasting liner plate completely covers the first single Ti6Al4V titanium alloy sheet-shaped thin plate, namely the length and the width of the sand blasting liner plate are not less than those of the Ti6Al4V titanium alloy sheet-shaped thin plate.
The thickness of the sand blasting cushion plate is 2-3 mm, the unevenness is not more than 1mm/m, and the material is any one of carbon steel or stainless steel.
And step 3: and completely overlapping a second single sheet of Ti6Al4V titanium alloy sheet thin plate to be leveled on the sand blasting cushion plate, wherein the length and the width of the second single sheet of Ti6Al4V titanium alloy sheet thin plate are not more than those of the sand blasting cushion plate.
And 4, step 4: repeating the processes of the step 2 and the step 3 until the height of the stacked plate stack reaches a preset height, and then placing a flat shape-correcting pressing plate on the top of the plate stack; the downward bottom surface of the sizing press plate is a sand blasting surface, and the roughness of the sand blasting surface is more than 2.5 mu m; the preset height is not higher than the effective heating area of the furnace chamber of the annealing furnace, and more Ti6Al4V titanium alloy sheet thin plates can be prevented from being placed as far as possible on the premise that the height of the effective heating area is not exceeded, so that the working efficiency is improved.
Further, the length and the width of the sizing press plate are not less than those of the Ti6Al4V titanium alloy sheet-like thin plate, namely the sizing press plate completely covers the top of the plate; the thickness of the correction pressing plate is 10-25 mm, the unevenness is not more than 1mm/m, and the material is any one of carbon steel or stainless steel.
And 5: pushing the plate stack stacked on the base plate table-board of the annealing furnace to a furnace chamber, closing the furnace door, and vacuumizing the furnace chamber of the annealing furnace until the vacuum degree is not lower than 10 -2 Maintaining the pressure in the furnace for 30min, heating to 200 deg.C, maintaining the temperature for 30min, and maintaining the vacuum degree in the furnace at 10 -2 And (4) heating to 750 ℃ under the pressure of MPa, keeping the temperature for 360min, cooling to 200 ℃ in a vacuum environment, introducing argon, cooling to below 50 ℃, and discharging to obtain the Ti6Al4V titanium alloy sheet with the thickness of 0.2mm, the width of 500mm, the length of 5000mm and the unevenness of not more than 1 mm/m.
In the above embodiment, the roughness of the sizing base plate, the sandblasting backing plate and the sizing press plate can ensure that the titanium and titanium alloy sheet-shaped thin plate after heat treatment can not be adhered to the sizing base plate, and the titanium and titanium alloy sheet-shaped thin plate can be easily taken down after heat treatment.
Titanium and titanium alloy are placed between plates with certain roughness requirement, and heat leveling treatment is carried out by adopting gradient heating, heat preservation and cooling processes, so that titanium and titanium alloy sheet-shaped thin plates with the unevenness not more than 3mm/m are obtained, the problem that the thin plates are overlapped and leveled and are adhered to each other is solved, and the unevenness of the leveled titanium and titanium alloy sheet-shaped thin plates can be kept for a long time.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (1)
1. A vacuum creep hot leveling treatment method for titanium and titanium alloy sheet-shaped thin plates is characterized by comprising the following steps:
step 1: placing a shape correcting base plate with a sand blasting surface on the upper surface on the platform surface of the base plate of the annealing furnace, and completely stacking a first single titanium and titanium alloy sheet-shaped thin plate on the sand blasting surface of the shape correcting base plate; the unevenness of the surface of the correction bottom plate is not more than 3mm/m, and the thickness is not less than 25 mm;
step 2: superposing a sand blasting base plate with the upper surface and the lower surface both being sand blasting surfaces on the first single titanium and titanium alloy sheet-shaped thin plate, wherein the sand blasting base plate completely covers the first single titanium and titanium alloy sheet-shaped thin plate; the unevenness of the sand blasting base plate is not more than 3mm/m, and the thickness of the sand blasting base plate is 2-3 mm;
and step 3: completely overlapping a second single sheet of titanium and titanium alloy sheet-shaped thin plate on the sand blasting backing plate; the thickness of the first single sheet of titanium and titanium alloy sheet-shaped thin plate and the thickness of the second single sheet of titanium and titanium alloy sheet-shaped thin plate are both less than 0.8 mm;
and 4, step 4: repeating the step 2 and the step 3 until the height of the stacked plate stack reaches a preset height, and then placing a shape correction pressing plate on the top of the plate stack, wherein the shape correction pressing plate completely covers the top of the plate stack; the downward bottom surface of the shape correcting pressure plate is a sand blasting surface; wherein the preset height is not higher than the height of the effective heating zone of the furnace chamber of the annealing furnace; the unevenness of the correction pressing plate is not more than 3mm/m, and the thickness of the correction pressing plate is 10-25 mm; the roughness of the sand spraying surfaces of the shape correcting base plate, the sand spraying base plate and the shape correcting pressing plate is more than 2.5 mu m;
and 5: pushing the plate stack on the platform surface of the chassis of the annealing furnace to a furnace chamber, vacuumizing the furnace chamber, wherein the vacuum degree is not less than 10 -2 And (3) maintaining the pressure for 30-35 min, heating to 220-250 ℃, preserving the heat for 30-35 min, then heating to 550-780 ℃, preserving the heat for 280-480 min, cooling to 180-200 ℃ in a vacuum environment, introducing argon, cooling to the temperature lower than 50 ℃, and discharging to obtain the leveled titanium and titanium alloy sheet.
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| CN201015775Y (en) * | 2007-01-31 | 2008-02-06 | 唐山建龙实业有限公司 | Rolling apparatus for the wide steel strip in the cold rolling |
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