A method for preparing a titanium alloy valence-dot array composite structure

Abstract

The present application relates to the technical field of plastic forming, and particularly relates to a preparation method of a titanium alloy valen-dot lattice composite structure, which comprises the following steps: a core plate is a titanium alloy hollow valen core plate, the core plate is placed between two titanium alloy face plates, a reinforcing rib is located at an end face of the corresponding titanium alloy face plate away from the core plate, two hollow steel plates are respectively wrapped in the two titanium alloy face plates, two steel face plates are respectively wrapped in the two hollow steel plates, the edges of the steel face plates and the steel frame are edge-welded, and an exhaust pipe is welded, so that a first preform is prepared; the first preform is diffusion connected; the steel frame and the steel face plate of the first preform after diffusion connection are removed, and an air inlet pipe is welded at the air passage position of the core plate, so that a second preform is prepared; the second preform is superplastically formed, so that the titanium alloy valen-dot lattice composite structure is prepared. The purpose of the preparation method of the titanium alloy valen-dot lattice composite structure is to solve the problem of low heat dissipation efficiency of the titanium alloy hollow valen structure.

Description

Technical Field

[0001] This invention relates to the field of plastic forming technology, specifically to a method for preparing a titanium alloy walon-lattice composite structure. Background Technology

[0002] Hollow titanium alloy wall structures possess both excellent performance and integrated heat dissipation functionality through internal cooling media. Hollow wall structures manufactured using superplastic forming / diffusion bonding processes offer advantages such as light weight, good vibration resistance, and long service life. Using hollow titanium alloy wall structures in components such as aero-engine fans can effectively reduce engine weight, improve component strength, and enhance impact resistance. When used as a heat dissipation structure, the cooling medium flows through a central channel, lowering the temperature of the hot surface; however, this heat dissipation method is considered "channel cooling," which limits its overall efficiency.

[0003] Therefore, the inventors have provided a method for preparing a titanium alloy walon-lattice composite structure. Summary of the Invention

[0004] (1) Technical problems to be solved

[0005] This invention provides a method for preparing a titanium alloy waler-lattice composite structure, which solves the technical problem of low heat dissipation efficiency of titanium alloy hollow waler structures.

[0006] (2) Technical solution

[0007] This invention provides a method for preparing a titanium alloy Valen-lattice composite structure, comprising the following steps:

[0008] A titanium alloy panel, a core plate, and reinforcing ribs are manufactured; wherein the core plate is a titanium alloy perforated varistor core plate, and the reinforcing ribs are perforated strips;

[0009] Processing steel panels, steel frames, and perforated steel plates;

[0010] The surfaces of the core board and the perforated steel plate are coated with anti-welding agent, and both sides of the perforated steel plate are fully coated with anti-welding agent;

[0011] The core plate is placed between the two titanium alloy panels, the reinforcing ribs are located on the end face of the corresponding titanium alloy panel away from the core plate, the two hollow steel plates are respectively covered by the two titanium alloy panels, the two steel panels are respectively covered by the two hollow steel plates, the steel frame fixes and clamps the two steel panels, and the edges of the steel panels and the steel frame are sealed by welding, and the air extraction pipe is welded to prepare the first preform.

[0012] After the first preform is baked and vacuum-sealed, diffusion bonding is performed.

[0013] The steel frame and steel panel of the first preform after diffusion bonding treatment are removed, and an air inlet pipe is welded at the air passage position of the core plate to prepare the second preform.

[0014] The second preform is placed into a superplastic forming mold for superplastic forming;

[0015] The hollowed-out steel plate and reinforcing ribs on the formed second preform were removed to prepare a titanium alloy walon-lattice composite structure.

[0016] Furthermore, the diffusion bonding process parameters are: 1.0MPa~2.0MPa / 920℃~960℃ / 2h~4h.

[0017] Furthermore, the superplastic forming process parameters are: 1.0MPa~2.0MPa / 920℃~960℃ / 1h~2h.

[0018] Furthermore, the titanium alloy walon-lattice structure is subjected to surface pickling.

[0019] This invention provides a method for preparing a titanium alloy walon-lattice composite structure, comprising the following steps:

[0020] A titanium-aluminum alloy panel and a core board are processed, wherein the core board is a titanium-aluminum alloy hollowed-out corrugated core board.

[0021] Apply a solder resist to the surface of the titanium-aluminum alloy panel;

[0022] A section of Ti2AlNb sheet is spliced ​​at the air intake position of the titanium-aluminum alloy panel;

[0023] A layer of brazing filler metal is coated on the edge of the titanium-aluminum alloy panel and the edge of the air intake channel of the Ti2AlNb plate.

[0024] The core plate is placed between the two titanium alloy panels, and the two steel panels are respectively covered by the two titanium alloy panels. The steel frame fixes and clamps the two steel panels, and the edges of the steel panels and the steel frame are spot welded to prepare the first preform.

[0025] Diffusion bonding is performed on the first preform;

[0026] The steel frame and steel panel of the first preform after diffusion bonding are removed, and an air inlet pipe is welded at the air inlet position of the Ti2AlNb plate to prepare the second preform.

[0027] The second preform is placed in a superplastic forming mold and superplastic forming is performed to prepare a titanium alloy walon-lattice composite structure.

[0028] Furthermore, the welding process parameters are: 900℃~920℃ / 5min~10min.

[0029] Furthermore, the diffusion bonding process parameters are: 4.0MPa~6.0MPa / 1100℃~1150℃ / 2h~4h.

[0030] Furthermore, the superplastic forming process parameters are: 4.0MPa~6.0MPa / 1100℃~1150℃ / 1h~2h.

[0031] Furthermore, the intake pipe is made of TC4 titanium alloy.

[0032] Furthermore, the titanium-aluminum alloy walon-lattice structure is subjected to surface pickling.

[0033] (3) Beneficial effects

[0034] In summary, this invention combines a hollow walnut structure and a three-dimensional lattice structure, specifically by creating triangular windows in the middle of the ribs of the walnut structure to connect the channels on both sides of the ribs, thereby significantly improving heat dissipation efficiency. This titanium alloy walnut-lattice composite structure can be fabricated using superplastic forming / diffusion bonding processes. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic flowchart of a method for preparing a titanium alloy Warren-lattice composite structure according to an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of a core board provided in an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of a reinforcing rib provided in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of a steel frame structure provided in an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the structure of a perforated steel plate provided in an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of a solder resist coating structure on the front side of a core board provided in an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of a flux-stop coating structure on the reverse side of a core board provided in an embodiment of the present invention;

[0043] Figure 8 This is a schematic diagram of the front structure of a preform provided in an embodiment of the present invention;

[0044] Figure 9 This is a schematic diagram of the reverse side structure of a preform provided in an embodiment of the present invention;

[0045] Figure 10 This is a schematic flowchart of a method for preparing a titanium alloy Warren-lattice composite structure according to an embodiment of the present invention;

[0046] Figure 11 This is a schematic diagram of the coating structure of brazing filler metal and anti-soldering agent on the front side of a titanium-aluminum alloy according to an embodiment of the present invention;

[0047] Figure 12 This is a schematic diagram of the coating structure of brazing filler metal and anti-soldering agent on the reverse side of a titanium-aluminum alloy according to an embodiment of the present invention;

[0048] Figure 13 This is a schematic diagram of the splicing structure of a Ti2AlNb plate provided in an embodiment of the present invention.

[0049] In the picture:

[0050] 1-Core board; 2-Reinforcing rib; 3-Steel frame; 4-Perforated steel plate; 5-Weld stop flux; 6-TC4 plate; 7-Connecting interface; 8-Ti2AlNb plate; 9-Binder alloy; 10-Titanium aluminum alloy panel. Detailed Implementation

[0051] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. That is, the present invention is not limited to the described embodiments, and any modifications, substitutions and improvements to the parts, components and connection methods are covered without departing from the spirit of the present invention.

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0053] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0054] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] Figure 1 This is a schematic flowchart illustrating a method for preparing a titanium alloy Warren-lattice composite structure according to an embodiment of the present invention. (See attached diagram.) Figure 1 The method may include the following steps:

[0056] S101, Processing titanium alloy panels, core plates, and reinforcing ribs; among which, such as Figure 2 As shown, core board 1 is a titanium alloy hollowed-out walnut core board, as... Figure 3 As shown, the reinforcing rib 2 is a perforated strip.

[0057] Specifically, high-pressure water or laser cutting methods can be used to process titanium alloy panels, core boards, and reinforcing ribs. The reinforcing ribs are manufactured using external processes; by employing these external reinforcing ribs, a titanium alloy walon-lattice composite structure with a panel thickness smaller than the core board thickness can be fabricated.

[0058] S102, Process steel panels, steel frames and perforated steel plates.

[0059] Specifically, high-pressure water or laser cutting methods can be used to process steel panels and steel frames (such as...). Figure 4 (as shown), hollowed-out steel plate 4 (as shown) Figure 5 (As shown).

[0060] S103. The surfaces of the core board and the perforated steel plate are coated with anti-welding agent, and both sides of the perforated steel plate are fully coated with anti-welding agent.

[0061] Specifically, such as Figures 6-7 As shown, the core board 1 has solder resist 5 applied to the hollowed-out positions on both sides.

[0062] S104. Place the core plate between two titanium alloy panels, with reinforcing ribs located on the end faces of the corresponding titanium alloy panels furthest from the core plate. Two perforated steel plates cover the two titanium alloy panels respectively, and two steel panels cover the two perforated steel plates respectively. A steel frame fixes and clamps the two steel panels, and the edges of the steel panels and the steel frame are sealed by welding. An extraction pipe is then welded to prepare a core plate as shown in the image. Figures 8-9 The first preform shown.

[0063] S105. After the first preform is baked and vacuum-sealed, diffusion bonding is performed.

[0064] Specifically, the diffusion bonding process parameters are: 1.0MPa~2.0MPa / 920℃~960℃ / 2h~4h.

[0065] S106. Remove the steel frame and steel panel of the first preform after diffusion bonding treatment, and weld the air inlet pipe at the air passage position of the core plate to prepare the second preform.

[0066] Specifically, the steel frame and steel panel of the first preform after diffusion bonding are removed by high-pressure water or laser cutting to expose the inner titanium alloy panel, and a titanium alloy air inlet pipe is welded to the air passage position of the titanium alloy hollowed-out walnut core plate.

[0067] S107. Place the second preform into the superplastic forming mold and perform superplastic forming.

[0068] Specifically, the superplastic forming process parameters are: 1.0MPa~2.0MPa / 920℃~960℃ / 1h~2h.

[0069] S108. Remove the hollowed-out steel plate and reinforcing ribs from the formed second preform to prepare a titanium alloy walon-lattice composite structure.

[0070] Specifically, the perforated steel plate on the formed second preform is removed, and the process reinforcing ribs on the outside of the titanium alloy panel are removed by CNC machining to prepare a titanium alloy walon-lattice composite structure with a smooth surface.

[0071] In the above embodiments, to ensure that the titanium alloy hollow lattice structure maintains excellent mechanical properties while also possessing good heat dissipation, the hollow lattice structure and the three-dimensional lattice structure are combined to form a titanium alloy hollow lattice core plate (specifically, a triangular window can be cut into the middle of the ribs of the lattice structure). This allows the channels on both sides of the ribs of the core plate to connect, thereby greatly improving heat dissipation efficiency. This titanium alloy lattice-lattice composite structure can be prepared using a superplastic forming / diffusion bonding process.

[0072] As an optional implementation, the titanium alloy walon-lattice structure is subjected to surface pickling. Surface pickling removes oxide scale and dirt from the surface.

[0073] Figure 10 This is a schematic flowchart illustrating a method for preparing a titanium alloy Warren-lattice composite structure according to an embodiment of the present invention. (See attached diagram.) Figure 10 The method may include the following steps:

[0074] S201. Process the titanium-aluminum alloy panel and core board. The core board is a titanium-aluminum alloy hollowed-out corrugated core board.

[0075] Specifically, high-pressure water or laser cutting methods can be used to process titanium-aluminum alloy panels and core boards.

[0076] S202. Apply a solder resist agent to the surface of the titanium-aluminum alloy panel.

[0077] Specifically, such as Figure 12 As shown, a solder resist agent 5 is coated on the surface of the titanium-aluminum alloy panel 10.

[0078] S203. A section of Ti2AlNb sheet is spliced ​​at the air intake position of the titanium-aluminum alloy panel.

[0079] Specifically, such as Figure 13 As shown, one end of the TC4 plate 6 is connected to one end of the Ti2AlNb plate 8, and the connection interface 7 is a brazed or diffusion-bonded section. By welding the Ti2AlNb air inlet at the air inlet position of the titanium-aluminum alloy sheath, the problem of welding the air inlet pipe to the titanium-aluminum alloy superplastic forming sheath is solved, and the superplastic forming of the difficult-to-form titanium-aluminum alloy material is realized.

[0080] S204. A layer of brazing filler metal is applied to the edge of the air intake of the titanium-aluminum alloy panel and the Ti2AlNb plate.

[0081] Specifically, such as Figure 11 As shown, a ring of solder 9 is coated on the surface edge of the titanium-aluminum alloy panel 10 and the air intake edge of the Ti2AlNb plate.

[0082] S205. The core board is placed between two titanium alloy panels, and two steel panels are respectively wrapped around the two titanium alloy panels. The steel frame fixes and clamps the two steel panels, and the edges of the steel panels and the steel frame are spot welded to prepare the first preform.

[0083] Specifically, the preform after spot welding is placed in a gas diffusion furnace and brazed under process parameters of 900℃~920℃ / 5min~10min to achieve the sealing of the pocket. The method of sealing the edges with brazing solder to enclose the cladding formed by the stacking of titanium-aluminum alloy panels and core plates enables subsequent superplastic forming, solving the problem of difficult edge sealing of titanium-aluminum alloys through welding.

[0084] S206. Diffusion bonding is performed on the first preform.

[0085] Specifically, argon gas is introduced into a gas diffusion furnace, and diffusion bonding of the titanium-aluminum alloy panel and the titanium-aluminum alloy hollowed-out core plate is achieved under the following process parameters: 4.0MPa~6.0MPa / 1100℃~1150℃ / 2h~4h.

[0086] S207. Remove the steel frame and steel panel of the first preform after diffusion bonding, and weld an air inlet pipe at the air inlet position of the Ti2AlNb plate to prepare the second preform. The air inlet pipe is made of TC4 titanium alloy.

[0087] S208. The second preform is placed in a superplastic forming mold and superplastic forming is performed to prepare a titanium alloy walon-lattice composite structure.

[0088] Specifically, the superplastic forming process parameters are: 4.0MPa~6.0MPa / 1100℃~1150℃ / 1h~2h.

[0089] In the above embodiments, to prepare the Warren / lattice structure of difficult-to-form and difficult-to-weld materials such as titanium-aluminum alloys, the core board and the panel are not edge-sealed after lamination, but are instead sealed by brazing. Similarly, a section of easily weldable material, such as Ti2AlNb, is welded to the inlet duct location by brazing or diffusion bonding. Before superplastic forming, an argon arc welding method is used to weld a TC4 titanium alloy inlet pipe to the front section of the easily weldable Ti2AlNb inlet pipe, for connecting to the argon gas source for superplastic forming.

[0090] As an optional implementation, the titanium-aluminum alloy walon-lattice structure is subjected to surface pickling. Surface pickling removes oxide scale and dirt from the surface.

[0091] Example 1

[0092] 1. Using high-pressure water or laser cutting methods, titanium alloy panels, core panels, and reinforcing ribs are processed. The core panel is a hollow core panel, the reinforcing ribs are perforated strips, and the panel is a flat plate.

[0093] 2. Steel panels, steel frames, and perforated steel plates are processed using high-pressure water or laser cutting methods;

[0094] 3. Assemble the titanium alloy panel, core plate, process reinforcing ribs, steel frame, and steel panel together, and seal the edges of the steel panel and steel frame with edge welding, and weld the exhaust pipe;

[0095] 4. After baking and vacuum sealing, the preform of the welded exhaust pipe is sent to a gas diffusion furnace for diffusion bonding. The diffusion bonding process is as follows: 1.0MPa~2.0MPa / 920℃~960℃ / 2h~4h.

[0096] 5. Using high-pressure water or laser cutting, remove the steel frame and steel panel of the preform after diffusion bonding to expose the internal titanium alloy, and weld the titanium alloy air inlet pipe at the air passage position of the titanium alloy hollow core plate.

[0097] 6. Place the preform of the welded air intake pipe into the superplastic forming mold and perform superplastic forming. The superplastic forming process is: 1.0MPa~2.0MPa / 920℃~960℃ / 1h~2h;

[0098] 7. Remove the perforated steel plate from the formed preform and use CNC machining to remove the process reinforcing ribs on the outside of the titanium alloy panel to prepare a titanium alloy walon-lattice structure with a smooth surface.

[0099] 8. Perform surface pickling on the titanium alloy walon-lattice structure to remove surface oxide scale and dirt.

[0100] Example 2

[0101] 1. Using high-pressure water or laser cutting methods, titanium-aluminum alloy panels, core boards, and reinforcing ribs are processed. The core board is a hollow core board, the reinforcing ribs are perforated strips, and the panel is a flat plate.

[0102] 2. Steel panels, steel frames, and perforated steel plates are processed using high-pressure water or laser cutting methods;

[0103] 3. Assemble the titanium-aluminum alloy panel, core plate, spliced ​​Ti2AlNb plate air intake, process reinforcing ribs, steel frame, and steel panel together, and seal the edges of the steel panel and steel frame with edge welding, and weld the exhaust pipe.

[0104] 4. After baking and vacuum sealing, the preform of the welded extraction pipe is sent to a gas diffusion furnace for diffusion bonding. The diffusion bonding process is as follows: 4.0MPa~6.0MPa / 1100℃~1150℃ / 2h~4h.

[0105] 5. Using high-pressure water or laser cutting, remove the steel frame and steel panel of the preform after diffusion bonding to expose the internal titanium-aluminum alloy, and weld TC4 titanium alloy air inlet pipe at the air duct position of the spliced ​​Ti2AlNb hollow core plate.

[0106] 6. Place the preform of the welded air intake pipe into the superplastic forming mold and perform superplastic forming. The superplastic forming process is: 4.0MPa~6.0MPa / 1100℃~1150℃ / 1h~2h;

[0107] 7. Remove the perforated steel plate from the formed preform and use CNC machining to remove the process reinforcing ribs on the outside of the titanium-aluminum alloy panel to prepare a titanium-aluminum alloy walen-lattice structure with a smooth surface.

[0108] 8. Perform surface pickling on the titanium-aluminum alloy walon-lattice structure to remove surface oxide scale and dirt.

[0109] Example 3

[0110] 1. Use high-pressure water or laser cutting methods to process titanium-aluminum alloy panels and core boards, wherein the core board is a hollow core board;

[0111] 2. Apply a solder resist agent to the surface of the titanium-aluminum alloy panel. The solder resist agent pattern for the titanium-aluminum alloy panel is as follows: Figure 5 As shown;

[0112] 3. Splice a section of Ti2AlNb sheet at the air intake position;

[0113] 4. Apply a layer of solder to the edges of the air intake channels of the panel and the spliced ​​Ti2AlNb plates, such as... Figure 8 As shown;

[0114] 5. Assemble the titanium alloy panel and core plate together, and spot weld the edges of the steel panel and steel frame using argon arc welding;

[0115] 6. Place the spot-welded preform into a gas diffusion furnace and braze it under the process parameters of 900℃~920℃ / 5min~10min to seal the pocket. Then, argon gas is introduced into the gas diffusion furnace and diffused connection between the panel and the hollow core board is achieved under the process parameters of 4.0MPa~6.0MPa / 1100℃~1150℃ / 2h~4h.

[0116] 7. Weld a TC4 titanium alloy intake pipe at the spliced ​​Ti2AlNb intake duct location;

[0117] 8. Place the preform of the welded air intake pipe into a superplastic forming mold and superplastically form a titanium-aluminum alloy walon-lattice structure. The superplastic forming process is as follows: 4.0MPa~6.0MPa / 1100℃~1150℃ / 1h~2h.

[0118] 9. Perform surface pickling on the titanium-aluminum alloy walon-lattice structure to remove surface oxide scale and dirt.

[0119] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0120] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art without departing from the scope of the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A method for preparing a titanium alloy Warren-lattice composite structure, characterized in that, The method includes the following steps: A titanium-aluminum alloy panel and a core board are processed, wherein the core board is a titanium-aluminum alloy hollowed-out corrugated core board. Apply a solder resist to the surface of the titanium-aluminum alloy panel; A section of Ti2AlNb sheet is spliced ​​at the air intake position of the titanium-aluminum alloy panel; A layer of brazing filler metal is coated on the edge of the titanium-aluminum alloy panel and the edge of the air intake of the Ti2AlNb plate. The air intake pipe is made of TC4 titanium alloy. The core board is placed between the two titanium-aluminum alloy panels, and two steel panels are respectively wrapped around the two titanium-aluminum alloy panels. The steel frame fixes and clamps the two steel panels, and the edges of the steel panels and the steel frame are brazed to prepare the first preform. Diffusion bonding is performed on the first preform; The steel frame and steel panel of the first preform after diffusion bonding are removed, and an air inlet pipe is welded at the air inlet position of the Ti2AlNb plate to prepare the second preform. The second preform is placed in a superplastic forming mold and superplastic forming is performed to prepare a titanium-aluminum alloy walon-lattice composite structure.

2. The method for preparing the titanium alloy Warren-lattice composite structure according to claim 1, characterized in that, The brazing process parameters are: 900℃~920℃ / 5min~10min.

3. The method for preparing the titanium alloy Warren-lattice composite structure according to claim 1, characterized in that, The diffusion bonding process parameters are: 4.0MPa~6.0MPa / 1100℃~1150℃ / 2h~4h.

4. The method for preparing the titanium alloy Warren-lattice composite structure according to claim 1, characterized in that, The superplastic forming process parameters are: 4.0MPa~6.0MPa / 1100℃~1150℃ / 1h~2h.

5. The method for preparing the titanium alloy Warren-lattice composite structure according to claim 1, characterized in that, The surface of the titanium-aluminum alloy walon-lattice structure is subjected to acid pickling.

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