A method for preparing an aluminum-titanium composite plate

Abstract

The invention discloses a method for preparing an aluminum-titanium composite plate, and belongs to the technical field of composite plate production. The method for preparing an aluminum-titanium composite plate comprises the following steps: S1, surface treatment of an aluminum plate and a titanium plate, and cleaning and drying the surfaces of the aluminum plate and the titanium plate; S2, assembling the aluminum plate and the titanium plate in a vacuum sealing device, and placing the assembled aluminum plate and the titanium plate in a heating furnace for the first heating; S3, performing a first-pass rolling on the aluminum plate and the titanium plate after the first heating to obtain a rolled blank; S4, placing the rolled blank in a heating furnace for the second heating; S5, performing a second-pass rolling on the rolled blank after the second heating, cooling to room temperature, and obtaining a composite plate blank; S6, heat-treating the composite plate blank to obtain an aluminum-titanium composite plate. The method for preparing an aluminum-titanium composite plate according to the present invention can solve the problems of complex production process and low bonding strength of the existing aluminum-titanium composite plate.

Description

Technical Field

[0001] The invention relates to the technical field of composite plate production, and in particular to a method for preparing an aluminum-titanium composite plate. Background Art

[0002] Metal composite panels refer to a layer of metal covered with another metal, which saves resources and reduces costs without reducing the use effect (anti-corrosion performance, mechanical strength, etc.). Metal composite panels can greatly improve the thermal expansion, strength, toughness, corrosion resistance, wear resistance, electrical properties, magnetic properties, etc. of a single metal material, and are widely used in industrial fields such as petroleum, chemical industry, shipbuilding, metallurgy, electricity, water conservancy, transportation, environmental protection, food, and pharmaceuticals. In addition to its structural and functional characteristics, metal composite panels can also save the use of precious metals and significantly reduce material costs.

[0003] Titanium alloy has the characteristics of low density, high specific strength, corrosion resistance, high temperature impact resistance, etc., but the price of titanium alloy is relatively expensive, while the price of aluminum alloy is relatively low, the density is low, and it has good specific strength. Therefore, titanium and aluminum are often compounded to obtain high temperature resistant and corrosion resistant lightweight composite plates.

[0004] The composite methods of titanium aluminum composite plates usually include explosive composite, explosive rolling composite, rolling composite, etc. The existing patent CN201611176536.4 discloses a layered high-strength and lightweight titanium aluminum composite plate and a preparation method thereof. The composite plate is composed of a LY12 aluminum alloy base layer and a TA18 titanium alloy cladding layer, and the thickness ratio of the TA18 layer to the LY12 layer is 1:2. The preparation method of the layered titanium aluminum composite plate includes the following steps: (1) selection of raw materials (2) surface treatment of raw materials (3) explosive welding (4) softening annealing (5) cold rolling processing (6) heat treatment and leveling. The layered high-strength and lightweight TA18 / LY12 titanium aluminum composite plate prepared by the present invention has excellent mechanical properties and can be applied in the fields of aviation, aerospace equipment and weapons and equipment. However, the above patent uses the method of explosive welding to produce composite plates. The cost and process difficulty of explosive welding are relatively large, and it is difficult to be widely used.

[0005] The existing patent CN201310218419.X discloses a method for preparing a layered titanium-aluminum composite plate, which is coated with a layer of aluminum or aluminum alloy on the surface of the combined titanium or titanium alloy plate by solid-liquid cladding, and then the aluminum or aluminum alloy plate and the coated plate are composited by thermal diffusion / hot rolling composite to obtain a layered titanium-aluminum composite plate blank, and finally the finished layered titanium-aluminum composite plate is obtained by cold rolling deformation. Compared with the explosion / rolling composite method, the cost and process difficulty of this method are greatly reduced, and the production efficiency is greatly improved. However, it is necessary to coat the surface of the titanium alloy with an aluminum layer, and the process is relatively complicated, which affects the production efficiency. In addition, the bonding between aluminum and titanium relies on the diffusion between the aluminum plate and the aluminum coating to bond, resulting in a relatively low bonding strength between the aluminum-titanium composite plates. Summary of the invention

[0006] The purpose of the present invention is to provide a method for preparing an aluminum-titanium composite plate, so as to solve the problems of complex production process and low bonding strength of the existing aluminum-titanium composite plate.

[0007] To achieve the above object, the present invention provides a method for preparing an aluminum-titanium composite plate, comprising the following steps:

[0008] S1. Surface treatment is performed on the aluminum plate and the titanium plate, and the surfaces of the aluminum plate and the titanium plate are cleaned and dried;

[0009] S2, assembling the aluminum plate and the titanium plate in a vacuum sealing device, and placing the assembled aluminum plate and the titanium plate into a heating furnace for a first heating;

[0010] S3, performing a first rolling process on the aluminum plate and the titanium plate after the first heating to obtain a rolled billet;

[0011] S4, placing the rolled billet into a heating furnace for a second heating;

[0012] S5, rolling the rolled billet after the second heating for a second time, cooling it to room temperature, and obtaining a composite billet;

[0013] S6. Heat-treating the composite plate blank to obtain an aluminum-titanium composite plate.

[0014] Preferably, in S1, the surfaces of the aluminum plate and the titanium plate are ground with sandpaper and then polished with a disc and a flat grinder, and the surface roughness of the polished aluminum plate and the titanium plate is 6μm-10μm; the surfaces of the aluminum plate and the titanium plate are cleaned with alcohol and dried.

[0015] Preferably, in S2, the first heating is performed under argon protection, the heating temperature of the heating furnace is 530°C, the heating rate is 20°C / min, and the insulation time is 5min.

[0016] Preferably, in S3, the deformation of the first rolling pass is 33%-38%, the roll diameter of the working roll is 600 mm, and the rolling speed is 20 r / min.

[0017] Preferably, in S4, the second heating is performed under argon protection, the heating temperature of the heating furnace is 530° C., the heating rate is 20° C. / min, and the holding time is 5 min.

[0018] Preferably, in S5, the deformation amount of the second rolling is 24%-27%.

[0019] Preferably, in S6, the heat treatment temperature is 300° C. and the holding time is 15 h.

[0020] Preferably, in S2, the vacuum sealing device includes a steel plate, and a receiving groove for accommodating an aluminum plate and a titanium plate is provided on the surface of the steel plate. The steel plate, the aluminum plate and the titanium plate are assembled in the welding tool in the order of steel plate-titanium plate-aluminum plate-steel plate, and the steel plates are welded, and the cavities between the steel plates are vacuumed. The aluminum plates and the titanium plates are stacked in a vacuum environment, and the steel plate welding is performed under argon protection, and the welding current is 80A.

[0021] Preferably, the welding tool comprises an assembly mechanism and a clamping mechanism, and the clamping mechanism is located directly above the assembly mechanism;

[0022] The clamping mechanism includes a workbench, a support leg for supporting the workbench is arranged on the workbench, a push plate for aligning the steel plate is slidably arranged on the upper surface of the workbench, a power structure for driving the push plate to slide synchronously along the workbench is arranged below the workbench, a groove is arranged on the upper surface of the workbench, a second top plate for lifting the vacuum sealing device is arranged in the groove, and a lifting cylinder for driving the second top plate to move up and down is arranged on the workbench;

[0023] The power structure includes a rotating shaft, which is located at the center of the workbench and is rotatably connected to the workbench. A rotating plate is arranged at the bottom of the rotating shaft, and the rotating plate and the slide plate are hinged by a connecting rod. The slide plate is located directly below the push plate and is arranged one-to-one with the push plate. The slide plate and the push plate are connected by a limiting plate. A limiting groove for the limiting plate to pass through is arranged on the workbench, and the limiting plate is slidably connected to the limiting groove. A guide rail that guides the sliding of the slide plate is arranged on the lower surface of the workbench, and the guide rail is located on both sides of the limiting groove. A first fixed plate is arranged on one slide plate, and a second fixed plate is arranged on the other slide plate arranged opposite to it, and the first fixed plate and the second fixed plate are connected by a telescopic cylinder.

[0024] A through hole for the piston rod of the jacking cylinder to pass through is arranged in the middle of the rotating shaft. The piston rod is rotatably connected to the rotating shaft, and the top end of the piston rod is fixedly connected to the second top plate.

[0025] Preferably, the clamping mechanism comprises a first top plate, the first top plate is located directly above the workbench, the first top plate and the workbench are connected via a connecting rod, a lifting seat is arranged below the first top plate, a lifting structure for driving the lifting seat to lift is arranged on the first top plate, and a clamping structure for clamping the vacuum sealing device is arranged on the lower surface of the lifting seat;

[0026] The lifting structure includes a pressing cylinder, which is arranged on a first top plate, a through hole for a piston rod of the pressing cylinder to pass through is arranged on the first top plate, the piston rod of the pressing cylinder is connected to a lifting seat, a guide rod for guiding the lifting of the lifting seat is arranged on the lifting seat, a guide hole for the guide rod to pass through is arranged on the first top plate, the guide rod is slidably connected to the first top plate, and a first buffer spring is arranged between the lifting seat and the first top plate;

[0027] The clamping structure includes a slider, which is arranged on a lifting seat in a cross shape, and the lifting seat is provided with a mounting groove for accommodating the slider, the slider is slidably connected to the mounting groove, a first inclined surface is arranged on the top of the slider and gradually tilts downward from the outside to the inside, a second inclined surface is arranged on the top of the mounting groove and matches the first inclined surface, a slide rail that has a guiding effect on the sliding of the slider is arranged on the second inclined surface, a slide groove matched with the slide rail is arranged on the slider, the slide rail is located in the slide groove and is slidably connected to the slide groove, a slot is arranged on one end of the slider located inside the mounting slot, a slide rod is slidably arranged in the slot, a slide seat is arranged on the end of the slide rod extending out of the slot, a guide groove matched with the slide seat is arranged at the end of the mounting slot, the slide seat is located in the guide groove and is slidably connected to the guide groove, and a second spring is arranged between the slide seat and the slider; a pressure plate that contacts the vacuum sealing device is arranged at the bottom of the slider.

[0028] The advantages and positive effects of the preparation method of the aluminum-titanium composite plate of the present invention are:

[0029] 1. The present invention uses a vacuum sealing device to wrap the aluminum plate and the titanium plate, so that the aluminum plate and the titanium plate are heated and hot-rolled in a vacuum environment, and oxides are generated on the surface of the aluminum plate and the titanium plate, which is beneficial to improve the composite effect of the aluminum plate and the titanium plate.

[0030] 2. The present claim claims heating the aluminum plate and the titanium plate at 530°C for 5 minutes. The short-time heating and heat preservation reduces the generation of brittle compounds at the interface while ensuring the deformation of the aluminum plate and the titanium plate, which is beneficial to improving the composite strength of the aluminum plate and the titanium plate.

[0031] 3. The roughness of the aluminum plate and the titanium plate is controlled to be 6μm-10μm, which increases the contact area of ​​the interface between the titanium plate and the aluminum plate, and forms a wider and more stable metallurgical bonding surface during the hot rolling process, which is beneficial to improving the shear strength of the titanium-aluminum composite plate.

[0032] 4. After heating the titanium plate and the aluminum plate, two hot rolling processes are performed to form an aluminum-titanium composite plate, and the process is simple.

[0033] 5. Heat treat the rolled aluminum-titanium composite plate to remove the internal stress during the rolling process and obtain a fine grain structure.

[0034] 6. Welding tooling is used for welding steel plates and assembling titanium plates and aluminum plates, which improves the assembly effect.

[0035] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a flow chart of an embodiment of the present invention;

[0037] Figure 2 This is a metallographic diagram of a TA1 titanium plate according to an embodiment of the present invention;

[0038] Figure 3 This is a metallographic diagram of a 5083Al aluminum plate according to an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of steel plate welding according to an embodiment of the present invention;

[0040] Figure 5 This is a macroscopic image of the aluminum-titanium composite plate obtained in Example 1 of the present invention;

[0041] Figure 6 This is a metallographic image of a cross section of an aluminum-titanium composite plate obtained in Example 1 of the present invention;

[0042] Figure 7 This is a metallographic image of the cross section of the aluminum-titanium composite plate obtained in Example 3 of the present invention;

[0043] Figure 8 This is a phase distribution diagram of the aluminum-titanium composite plate obtained in Example 1 of the present invention;

[0044] Fig. 9 This is the IPF diagram of the aluminum-titanium composite plate obtained in Example 1 of the present invention;

[0045] Fig.10 A schematic diagram of the welding tool structure according to an embodiment of the present invention;

[0046] Fig.11 It is a schematic diagram of the three-dimensional structure of the assembly mechanism of an embodiment of the present invention;

[0047] Fig.12 It is a bottom view structural diagram of an assembly mechanism according to an embodiment of the present invention;

[0048] Fig.13 It is a schematic diagram of the cross-sectional structure of the assembly mechanism of an embodiment of the present invention;

[0049] Fig.14 It is a schematic diagram of the three-dimensional structure of the clamping mechanism according to an embodiment of the present invention;

[0050] Fig.15 It is a front view structural schematic diagram of the clamping mechanism of an embodiment of the present invention;

[0051] Fig.16 A schematic diagram of the cross-sectional structure of a clamping mechanism according to an embodiment of the present invention;

[0052] Fig.17 Schematic diagram of the steel plate structure according to an embodiment of the present invention.

[0053] Reference numerals

[0054] 1. Assembling mechanism; 11. Workbench; 12. Support legs; 13. Push plate; 14. Lifting cylinder; 15. First top plate; 16. Limiting groove; 17. Slide plate; 18. Limiting plate; 19. Rotating shaft; 110. Rotating plate; 111. Connecting rod; 112. Telescopic cylinder; 113. First fixed plate; 114. Second fixed plate; 115. Guide rail; 116. Groove;

[0055] 2. Clamping mechanism; 21. Second top plate; 22. Connecting rod; 23. Clamping cylinder; 24. Lifting seat; 25. Guide rod; 26. First spring; 27. Sliding block; 28. Pressing plate; 29. ​​Mounting groove; 210. Slide rail; 211. Slide groove; 212. Guide groove; 213. Sliding seat; 214. Slot; 215. Sliding rod; 216. Second spring;

[0056] 3. Receiving tank. DETAILED DESCRIPTION

[0057] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0058] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0059] like Figure 1 A method for preparing an aluminum-titanium composite plate comprises the following steps:

[0060] S1. Surface treatment is performed on the aluminum plate and the titanium plate, and the surfaces of the aluminum plate and the titanium plate are cleaned and dried.

[0061] The surfaces of the aluminum plate and the titanium plate are ground with sandpaper, and then polished with a disc and a flat grinder. The surface roughness of the polished aluminum plate and the titanium plate is 6μm-10μm. The surfaces of the aluminum plate and the titanium plate are cleaned with alcohol and dried. The oxides on the surfaces of the aluminum plate and the titanium plate are removed after grinding and polishing, and the surface roughness of the aluminum plate and the titanium plate is controlled to be 6μm-10μm. The surface of the aluminum plate and the titanium plate is polished to form a significant roughness, which is beneficial to increase the contact area between the aluminum plate and the titanium plate during the rolling process, and is beneficial to the diffusion between the aluminum plate and the titanium plate, forming a thicker metallurgical bonding surface between the aluminum plate and the titanium plate, and improving the bonding strength of the aluminum plate and the titanium plate.

[0062] S2. Assemble the aluminum plate and the titanium plate in a vacuum sealing device, and place the assembled aluminum plate and the titanium plate into a heating furnace for the first heating.

[0063] The first heating is performed under argon protection, which can effectively prevent oxidation of the aluminum plate, titanium plate, and vacuum sealing device, and is beneficial to the rolling of the aluminum plate and titanium plate.

[0064] The heating furnace is a tubular heating furnace, the heating temperature of the heating furnace is 530°C, the heating rate is 20°C / min, and the holding time is 5min. A shorter holding time can prevent the formation of a brittle reaction layer between the aluminum plate and the titanium plate.

[0065] like Figure 4 , Fig.17 As shown. The vacuum sealing device includes a steel plate, and a receiving groove 3 for receiving an aluminum plate and a titanium plate is provided on the surface of the steel plate. The size of the receiving groove 3 is slightly larger than the size of the aluminum plate and the titanium plate, so that the aluminum plate and the titanium plate can be just placed in the receiving groove 3. The depth of the receiving groove 3 is less than the thickness of the aluminum plate and the titanium plate. The receiving groove 3 positions the aluminum plate and the titanium plate so that the aluminum plate and the titanium plate can be stacked together more accurately. The steel plate, the aluminum plate and the titanium plate are assembled in the welding tool in the order of steel plate-titanium plate-aluminum plate-steel plate, and the steel plate is welded. The cavity between the steel plates is vacuumed so that the aluminum plate and the titanium plate are stacked in a vacuum environment to avoid the formation of an oxide layer on the aluminum plate and the titanium plate during the heating process, thereby reducing the strength of the bonding surface. The steel plate welding is carried out under argon protection, and the welding current is 80A.

[0066] like Fig.10 The welding tool comprises an assembling mechanism 1 and a clamping mechanism 2, wherein the clamping mechanism 2 is located directly above the assembling mechanism 1.

[0067] like Figure 11-13 As shown, the clamping mechanism 2 includes a workbench 11, on which a support leg 12 is provided for supporting the workbench 11, and the workbench 11 is placed on the ground through the support leg 12. A push plate 13 for aligning the steel plate is slidably provided on the upper surface of the workbench 11, and four push plates 13 are provided, and the four push plates 13 are respectively located on the four sides of the steel plate, and the steel plate is aligned from four directions, so as to facilitate welding of the steel plate.

[0068] A power structure is provided below the workbench 11 to drive the push plate 13 to slide synchronously along the workbench 11. The power structure includes a rotating shaft 19, which is located at the center of the workbench 11 and is rotatably connected to the workbench 11 through a bearing. A rotating plate 110 is fixedly provided at the bottom of the rotating shaft 19. The rotating plate 110 is a square plate, and a semicircular groove is provided on the side of the square plate to reduce the mass of the rotating plate 110. The four corners of the rotating plate 110 are hinged to one end of a connecting rod 111, and the other end of the connecting rod 111 is hinged to the middle of the slide plate 17. The connecting rod 111 is arranged in an L-shaped structure. The rotating plate 110 drives the slide plate 17 to slide on the workbench 11 through the connecting rod 111.

[0069] The slide plate 17 is located directly below the push plate 13 and is arranged one-to-one with the push plate 13. The slide plate 17 is fixedly connected to the push plate 13 through the limit plate 18. The workbench 11 is provided with a limit groove 16 for the limit plate 18 to pass through, and the limit plate 18 is slidably connected to the limit groove 16. The lower surface of the workbench 11 is provided with a guide rail 115 that guides the sliding of the slide plate 17, and the guide rail 115 is located on both sides of the limit groove 16. The slide plate 17 is provided with a guide groove that matches the guide rail 115, and the guide rail 115 is located in the guide groove and is slidably connected to the guide groove.

[0070] A first fixing plate 113 is disposed on one of the slides 17, and a second fixing plate 114 is disposed on the other slide 17 opposite thereto. The first fixing plate 113 and the second fixing plate 114 are connected by a telescopic cylinder 112. The telescopic cylinder 112 provides power for the slide 17 to slide.

[0071] A groove 116 is provided on the upper surface of the workbench 11, and a second top plate 21 of the jacking vacuum sealing device is provided in the groove 116. A jacking cylinder 14 is provided on the workbench 11 to drive the second top plate 21 to move up and down, and the jacking cylinder 14 is fixed on the workbench 11 or the supporting leg 12. A through hole is provided in the middle of the rotating shaft 19 for the piston rod of the jacking cylinder 14 to pass through, and the piston rod is rotatably connected to the rotating shaft 19. The top end of the piston rod is fixedly connected to the second top plate 21. The jacking cylinder 14 drives the second top plate 21 to move up and down through the piston rod, and the second top plate 21 drives the vacuum sealing device to move upward, thereby facilitating the welding of the steel plate.

[0072] like Figure 14-16 The clamping mechanism 2 includes a first top plate 15, which is located directly above the workbench 11, and the first top plate 15 is fixedly connected to the workbench 11 via a connecting rod 22. A lifting seat 24 is disposed below the first top plate 15, and a lifting structure for driving the lifting seat 24 to rise and fall is disposed on the first top plate 15.

[0073] The lifting structure includes a clamping cylinder 23, which is arranged on the first top plate 15. The first top plate 15 is provided with a through hole for the piston rod of the clamping cylinder 23 to pass through, and the piston rod of the clamping cylinder 23 is fixedly connected to the lifting seat 24. A guide rod 25 that has a guiding effect on the lifting and lowering of the lifting seat 24 is fixedly arranged on the lifting seat 24, and a guide hole for the guide rod 25 to pass through is provided on the first top plate 15, and the guide rod 25 is slidably connected to the first top plate 15. A buffering first spring 26 is arranged between the lifting seat 24 and the first top plate 15, and the two ends of the first spring 26 are fixedly connected to the lifting seat 24 and the first top plate 15 respectively. The first spring 26 is sleeved on the outside of the guide rod 25.

[0074] A clamping structure for clamping the vacuum sealing device is provided on the lower surface of the lifting seat 24. The clamping structure includes a slider 27, which is arranged on the lifting seat 24 in a cross shape. Four sliders 27 clamp the steel plate from four directions respectively. A mounting groove 29 for accommodating the slider 27 is provided on the lifting seat 24, and the slider 27 is slidably connected with the mounting groove 29. A first inclined surface gradually tilted downward from the outside to the inside is provided on the top of the slider 27, and a second inclined surface matched with the first inclined surface is provided on the top of the mounting groove 29, and the slider 27 slides in the mounting groove 29 along the second inclined surface. A slide rail 210 with a guiding effect on the sliding of the slider 27 is provided on the second inclined surface, and a slide groove 211 matched with the slide rail 210 is provided on the slider 27, and the slide rail 210 is located in the slide groove 211 and is slidably connected with the slide groove 211. The slide groove 211 is a dovetail groove or a T-shaped groove to prevent the slider 27 from falling from the mounting groove 29.

[0075] A slot 214 is provided on one end of the slider 27 located inside the mounting groove 29, and a slide bar 215 is slidably provided in the slot 214. A slide seat 213 is fixedly provided on one end of the slide bar 215 extending out of the slot 214, and a guide groove 212 adapted to the slide seat 213 is provided at the end of the mounting groove 29, and the slide seat 213 is located in the guide groove 212 and slidably connected with the guide groove 212. The guide groove 212 is vertically arranged, and the slide seat 213 slides up and down in the guide groove 212. The guide groove 212 is a dovetail groove or a T-shaped groove to prevent the slide seat 213 from slipping out of the guide groove 212. A second spring 216 is provided between the slide seat 213 and the slider 27, and the two ends of the second spring 216 are fixedly connected to the slide seat 213 and the slider 27 respectively. The second spring 216 is sleeved on the slide bar 215. The second spring 216 applies an outward thrust to the slider 27. A pressing plate 28 in contact with the steel plate is fixedly provided at the bottom of the sliding block 27 , and a rubber anti-skid pad is fixedly provided on the lower surface of the pressing plate 28 .

[0076] The lifting cylinder 14, the telescopic cylinder 112 and the pressing cylinder 23 are all connected to an external air pump through a controller, and the specific connection method adopts existing technical connection according to needs.

[0077] When in use, first put the titanium plate and the aluminum plate into the accommodating groove 3 of the steel plate, place the titanium plate on top of the aluminum plate, put the stacking plate of steel plate-titanium plate-aluminum plate-steel plate on the workbench 11, start the telescopic cylinder 112, the telescopic cylinder 112 contracts, and drives the two relative slides 17 to slide synchronously relative to each other. The slide 17 drives the rotating plate 110 and the rotating shaft 19 to rotate through the connecting rod 111, and the rotating plate 110 drives the other two relative slides 17 to slide synchronously relative to each other through other connecting rods 111. The four slides 17 slide synchronously, and the slide 17 drives the push plate 13 to slide through the limit plate 18, and the push plate 13 aligns and clamps the steel plate.

[0078] The pressing cylinder 23 is started, and the pressing cylinder 23 is extended to drive the lifting seat 24 to move downward. The lifting seat 24 is pressed against the upper surface of the steel plate through the pressing plate 28 at the bottom. When the pressing plate 28 is pressing the steel plate, the slider 27 slides outward along the slide rail 210 under the action of the extrusion force, and the second spring 216 is stretched. The second spring 216 applies a pulling force to the slider 27. The slider 27 has a tendency to slide inward and downward under the action of the second spring 216, so that the pressing plate 28 is pressed against the upper surface of the steel plate, improving the stability of the steel plate pressing. If the steel plate has a tendency to move, the steel plate drives the slider 27 to move synchronously through the pressing plate 28. The slider 27 slides inward and downward under the action of the guide rail 115, so that the pressing plate 28 is pressed more tightly against the surface of the steel plate, preventing the steel plate from moving, improving the stability of the steel plate during the welding process, and improving the welding and assembly quality.

[0079] The lifting cylinder 14 is started, the lifting cylinder 14 is extended, the pressing cylinder 23 is contracted, and the lifting cylinder 14 drives the first top plate 21 to move upward. The stacking plate moves upward under the clamping action of the first top plate 21 and the pressing plate 28 to avoid the position of the push plate 13. The steel plate is welded, and the weld is tapped after welding to obtain a dense weld, reduce the thermal stress of the weld, improve the integrity of the weld in the subsequent rolling process, avoid weld cracking, and affect the vacuum rolling composite environment of the titanium plate and the aluminum plate.

[0080] S3, performing the first rolling on the aluminum plate and the titanium plate after the first heating to obtain a rolled billet.

[0081] The deformation of the first rolling is 33%-38%, the working roll diameter is 600mm, and the rolling speed is 20r / min. Although the aluminum and titanium plates are wrapped with steel plates, the thickness of the steel plates is relatively thin, which has little effect on the deformation of the aluminum and titanium plates.

[0082] S4, placing the rolled billet into a heating furnace for secondary heating.

[0083] The second heating was carried out under argon protection, the heating temperature of the heating furnace was 530°C, the heating rate was 20°C / min, and the holding time was 5min.

[0084] S5, rolling the rolled billet after the second heating for a second time, cooling it to room temperature, and obtaining a composite slab.

[0085] The deformation of the second rolling pass is 24%-27%.

[0086] After rolling is completed, the steel plate is cut off and the composite slab of the aluminum plate and the titanium plate is taken out from the steel plate.

[0087] S6. Heat-treating the composite plate blank to obtain an aluminum-titanium composite plate.

[0088] The heat treatment temperature is 300℃ and the holding time is 15h. Annealing heat treatment is used to eliminate the internal stress of the aluminum-titanium composite plate, refine the grains of the aluminum-titanium composite plate, and improve the mechanical properties of the aluminum-titanium composite plate.

[0089] Embodiment 1

[0090] A method for preparing an aluminum-titanium composite plate comprises the following steps:

[0091] S1. Surface treatment is performed on the aluminum plate and the titanium plate, and the surfaces of the aluminum plate and the titanium plate are cleaned and dried.

[0092] The titanium plate used in this embodiment is industrial pure titanium TA1, and the aluminum plate is 5083Al. The size of the titanium plate is 400mm×300mm×2mm, and the size of the aluminum plate is 400mm×300mm×6mm.

[0093] The surfaces of the aluminum plate and the titanium plate were ground with sandpaper and then polished with a disc and a flat grinder. The surfaces of the aluminum plate and the titanium plate were cleaned with alcohol and dried.

[0094] The surface roughness of the aluminum plate is 7 μm, and the surface roughness of the titanium plate is 8 μm.

[0095] The metallographic diagrams of titanium plate and aluminum plate are as follows Figure 2 , Figure 3 shown.

[0096] S2. Assemble the aluminum plate and the titanium plate in a vacuum sealing device, and place the assembled aluminum plate and the titanium plate into a heating furnace for the first heating.

[0097] The first heating was carried out under argon protection, the heating temperature of the heating furnace was 530°C, the heating rate was 20°C / min, and the holding time was 5min.

[0098] S3, performing the first rolling on the aluminum plate and the titanium plate after the first heating to obtain a rolled billet.

[0099] The deformation of the first rolling pass is 35%, the roll diameter of the working roll is 600 mm, and the rolling speed is 20 r / min.

[0100] S4, placing the rolled billet into a heating furnace for secondary heating.

[0101] The second heating was carried out under argon protection, the heating temperature of the heating furnace was 530°C, the heating rate was 20°C / min, and the holding time was 5min.

[0102] S5, rolling the rolled billet after the second heating for a second time, cooling it to room temperature, and obtaining a composite slab.

[0103] The deformation of the second rolling pass is 25%.

[0104] S6. Heat-treating the composite plate blank to obtain an aluminum-titanium composite plate.

[0105] The heat treatment temperature is 300°C and the holding time is 15h.

[0106] Embodiment 2

[0107] The difference between this embodiment and the first embodiment is that the surface roughness of the aluminum plate in this embodiment is 6 μm, and the surface roughness of the titanium plate is 6 μm. The first rolling deformation is 33%, and the second rolling deformation is 24%.

[0108] Embodiment 3

[0109] The difference between this embodiment and the first embodiment is that the surface roughness of the aluminum plate in this embodiment is 9 μm, and the surface roughness of the titanium plate is 10 μm. The first rolling deformation is 37%, and the second rolling deformation is 27%.

[0110] Comparative Example 1

[0111] The difference between this comparative example and the first embodiment is that in this comparative example, the surface roughness of the aluminum plate is 3 μm, and the surface roughness of the titanium plate is 3 μm.

[0112] Comparative Example 2

[0113] The difference between this comparative example and Example 1 is that in this comparative example, the aluminum plate and the titanium plate are directly stacked without vacuum treatment, and the aluminum plate and the titanium plate are heated and rolled in an air atmosphere, and the heating and rolling process is the same as that of Example 1.

[0114] The macroscopic image of the aluminum-titanium composite plate obtained in Example 1 is as follows: Figure 5 As shown. It can be seen that the titanium plate and the aluminum plate have a relatively good composite effect in the macroscopic view, and the surface is flat. The cross-sectional microstructure of the composite plate obtained in Example 1 and Example 3 is observed, as shown in FIG. Figure 6 , Figure 7 As shown. Figure 6 and Figure 7 It can be seen that the titanium plate and the aluminum plate are composited to form a close contact metallurgical bonding surface.

[0115] The phase distribution and grain size of the composite plate obtained in Example 1 were observed. Figure 8 , Fig. 9 It can be seen that the grain distribution at the bonding surface of the titanium plate and the aluminum plate is very fine, and is a fine equiaxed grain, which is beneficial to improving the composite strength of the aluminum plate and the titanium plate and improving the shear strength.

[0116] The aluminum-titanium composite plates obtained in Example 1, Example 2, Example 3, Comparative Example 1 and Comparative Example 2 were subjected to shear and bending tests. The test results are shown in Table 1.

[0117] Table 1 Shear and bending test results of aluminum-titanium composite plates

[0118]

[0119]

[0120] Therefore, the method for preparing the aluminum-titanium composite plate of the present invention can solve the problems of complex production process and low bonding strength of the existing aluminum-titanium composite plate.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for preparing an aluminum-titanium composite plate, characterized in that: The following steps are involved: S1. Surface treatment is performed on the aluminum plate and the titanium plate, and the surfaces of the aluminum plate and the titanium plate are cleaned and dried; S2, assembling the aluminum plate and the titanium plate in a vacuum sealing device, and placing the assembled aluminum plate and the titanium plate into a heating furnace for a first heating; S3, performing a first rolling process on the aluminum plate and the titanium plate after the first heating to obtain a rolled billet; S4, placing the rolled billet into a heating furnace for a second heating; S5, rolling the rolled billet after the second heating for a second time, cooling it to room temperature, and obtaining a composite billet; S6, heat treating the composite plate blank to obtain an aluminum-titanium composite plate; In S1, the surfaces of the aluminum plate and the titanium plate are ground with sandpaper and then polished with a disc and a flat grinder. The surface roughness of the polished aluminum plate and the titanium plate is 6 μm-10 μm; the surfaces of the aluminum plate and the titanium plate are cleaned with alcohol and dried; the thickness of the aluminum plate is 6 mm, and the thickness of the titanium plate is 2 mm; In S2, the first heating is performed under argon protection, the heating temperature of the heating furnace is 530°C, the heating rate is 20°C / min, and the holding time is 5min; In S3, the deformation of the first rolling pass is 33%-38%, the roll diameter of the working roll is 600mm, and the rolling speed is 20r / min; In S4, the second heating is performed under argon protection, the heating temperature of the heating furnace is 530°C, the heating rate is 20°C / min, and the holding time is 5min; In S6, the heat treatment temperature is 300° C. and the holding time is 15 h; In S2, the vacuum sealing device includes a steel plate, and a receiving groove for receiving an aluminum plate and a titanium plate is provided on the surface of the steel plate. The steel plate, the aluminum plate and the titanium plate are assembled in a welding tool in the order of steel plate-titanium plate-aluminum plate-steel plate, and the steel plate is welded, and the cavity between the steel plates is vacuumized. The aluminum plate and the titanium plate are stacked in a vacuum environment, and the steel plate welding is performed under argon protection, and the welding current is 80A; In S5, the deformation amount of the second rolling is 24%-27%; The welding tool comprises an assembly mechanism and a clamping mechanism, wherein the clamping mechanism is located directly above the assembly mechanism; The assembly mechanism includes a workbench, the workbench is provided with supporting legs for supporting the workbench, a push plate for aligning the steel plates is slidably provided on the upper surface of the workbench, a power structure for driving the push plate to slide synchronously along the workbench is provided below the workbench, a groove is provided on the upper surface of the workbench, a second top plate for lifting the vacuum sealing device is provided in the groove, and a lifting cylinder for driving the second top plate to move up and down is provided on the workbench; The power structure includes a rotating shaft, which is located at the center of the workbench and is rotatably connected to the workbench. A rotating plate is arranged at the bottom of the rotating shaft, and the rotating plate and the slide plate are hinged by a connecting rod. The slide plate is located directly below the push plate and is arranged one-to-one with the push plate. The slide plate and the push plate are connected by a limiting plate. A limiting groove for the limiting plate to pass through is arranged on the workbench, and the limiting plate is slidably connected to the limiting groove. A guide rail that guides the sliding of the slide plate is arranged on the lower surface of the workbench, and the guide rail is located on both sides of the limiting groove. A first fixed plate is arranged on one slide plate, and a second fixed plate is arranged on the other slide plate arranged opposite to it, and the first fixed plate and the second fixed plate are connected by a telescopic cylinder. A through hole is provided in the middle of the rotating shaft for the piston rod of the lifting cylinder to pass through, the piston rod is rotatably connected to the rotating shaft, and the top end of the piston rod is fixedly connected to the second top plate; The clamping mechanism includes a first top plate, the first top plate is located directly above the workbench, the first top plate and the workbench are connected by a connecting rod, a lifting seat is arranged below the first top plate, a lifting structure for driving the lifting seat to lift is arranged on the first top plate, and a clamping structure for clamping the vacuum sealing device is arranged on the lower surface of the lifting seat; The lifting structure includes a pressing cylinder, which is arranged on a first top plate, a through hole for a piston rod of the pressing cylinder to pass through is arranged on the first top plate, the piston rod of the pressing cylinder is connected to a lifting seat, a guide rod for guiding the lifting of the lifting seat is arranged on the lifting seat, a guide hole for the guide rod to pass through is arranged on the first top plate, the guide rod is slidably connected to the first top plate, and a first buffer spring is arranged between the lifting seat and the first top plate; The clamping structure includes a slider, which is arranged on a lifting seat in a cross shape, and the lifting seat is provided with a mounting groove for accommodating the slider, the slider is slidably connected to the mounting groove, a first inclined surface is arranged on the top of the slider and gradually tilts downward from the outside to the inside, a second inclined surface is arranged on the top of the mounting groove and matches the first inclined surface, a slide rail that has a guiding effect on the sliding of the slider is arranged on the second inclined surface, a slide groove matched with the slide rail is arranged on the slider, the slide rail is located in the slide groove and is slidably connected to the slide groove, a slot is arranged on one end of the slider located inside the mounting slot, a slide rod is slidably arranged in the slot, a slide seat is arranged on the end of the slide rod extending out of the slot, a guide groove matched with the slide seat is arranged at the end of the mounting slot, the slide seat is located in the guide groove and is slidably connected to the guide groove, and a second spring is arranged between the slide seat and the slider; a pressure plate that contacts the vacuum sealing device is arranged at the bottom of the slider.

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