Method and equipment for manufacturing titanium-aluminum composite pipe

Abstract

The invention provides a method and equipment for manufacturing a titanium-aluminum composite pipe, and the method comprises the following steps: melting metal aluminum to generate an aluminum solution, and heating the aluminum solution to 900 DEG C; the titanium tube is arranged in a graphite mold, and the titanium tube is heated to 900 DEG C; under the positive pressure nitrogen environment, the aluminum solution at the temperature of 900 DEG C is poured into the graphite mold, so that the aluminum solution at the temperature of 900 DEG C forms a metallurgical bonding layer on the surface of the titanium tube; and the mold is cooled through cold air till the aluminum solution and the titanium pipe in the mold are completely cooled, and the titanium-aluminum composite pipe is obtained. According to the method, the metal aluminum is melted and heated to the specific temperature, metallurgical bonding is conducted on the metal aluminum and the titanium pipe preheated to the same temperature under the nitrogen protection environment, and efficient preparation of the titanium-aluminum composite pipe is achieved. Compared with a traditional titanium-aluminum composite manufacturing method, the method has the advantages that the metal bonding strength is remarkably improved, the manufacturing process is greatly simplified, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of titanium-aluminum composite pipes, and particularly to a manufacturing method and equipment for titanium-aluminum composite pipes. Background Art

[0002] Titanium-aluminum composite pipes are mainly used in high-end fields such as aerospace, petrochemical, and automotive manufacturing, and are favored due to their excellent corrosion resistance and light weight and high strength characteristics. However, various defects in the above traditional manufacturing methods limit the large-scale production and application of titanium-aluminum composite pipes.

[0003] Traditional manufacturing methods for titanium-aluminum composites include explosive bonding method, rolling bonding method, drawing bonding method, and diffusion welding bonding method. Among them, explosive bonding (explosion welding) uses the shock wave generated by explosive explosion to make titanium and aluminum plates collide at high speed, and realizes metallurgical bonding through plastic deformation, but the cost is high and the manufacturing difficulty is large; rolling bonding (hot rolling / cold rolling) applies pressure through a rolling mill to make titanium and aluminum plastically deform and bond at high temperature billets (outer layer) are placed in an extrusion die, and high pressure is applied through an extruder to make them composite. Disadvantages: large equipment investment, limited extrusion ratio, and need to control the flow temperature of titanium and aluminum (hot rolling) or normal temperature (cold rolling). The disadvantage is that the metal bonding strength is poor; the drawing bonding method also has the disadvantage of poor metal bonding strength; the diffusion welding bonding method has the disadvantages of too high manufacturing environment requirements, long cycle, and low efficiency. Summary of the Invention

[0004] The present invention aims to at least solve the technical problem of poor metal bonding strength in the prior art, and particularly innovatively proposes a manufacturing method and equipment for titanium-aluminum composite pipes.

[0005] In order to achieve the above object of the present invention, the present invention provides a manufacturing method for titanium-aluminum composite pipes, and the method includes:

[0006] Melting metallic aluminum to generate an aluminum solution, and heating the aluminum solution to 900 degrees Celsius;

[0007] Placing a titanium pipe in a graphite mold, and heating the titanium pipe to 900 degrees Celsius;

[0008] Under a positive pressure nitrogen environment, pouring the 900-degree Celsius aluminum solution into the graphite mold, so that the 900-degree Celsius aluminum solution forms a metallurgical bonding layer on the surface of the titanium pipe;

[0009] Using cold air to cool the mold until the aluminum solution and the titanium pipe in the mold are completely cooled to obtain a titanium-aluminum composite pipe.

[0010] On the other hand, the present invention also provides a manufacturing equipment for titanium-aluminum composite pipes, which is used to implement the manufacturing method of the titanium-aluminum composite pipes described in the claims, and the equipment includes:

[0011] A support frame;

[0012] An aluminum melting furnace, which is arranged on the support frame;

[0013] A heating coil, which is arranged on the aluminum melting furnace and is used for heating metallic aluminum;

[0014] A positioning base, which is arranged on one side of the aluminum melting furnace and is close to the discharge port of the aluminum melting furnace;

[0015] A graphite mold, which is arranged on the positioning base;

[0016] A preheating coil, which is arranged on the graphite mold and is used for heating a titanium tube;

[0017] A plug, which is arranged inside the titanium tube and is located at the top of the graphite mold. An aluminum solution inlet is arranged between the plug and the graphite mold, and the aluminum solution enters the graphite mold through the aluminum solution inlet.

[0018] As an optional embodiment of the present invention, optionally, a thermocouple hole is arranged at the bottom of the positioning base.

[0019] As an optional embodiment of the present invention, optionally, a protrusion matching the bottom hole of the titanium tube and a positioning groove matching the graphite mold are arranged at the bottom of the positioning base.

[0020] As an optional embodiment of the present invention, optionally, nitrogen is arranged between the graphite mold and the titanium tube.

[0021] As an optional embodiment of the present invention, optionally, the aluminum melting furnace includes:

[0022] A melting furnace, which is arranged on the support frame and contains aluminum solution inside;

[0023] A cement block, which is suspended inside the melting furnace through a driving assembly.

[0024] As an optional embodiment of the present invention, optionally, the driving assembly includes:

[0025] A driver, which is arranged on the support frame;

[0026] A speed reducer, which is arranged on the output shaft of the driver;

[0027] A lead screw, which is arranged on the output shaft of the speed reducer;

[0028] A sliding key, which is movably arranged on the lead screw;

[0029] A connecting rod, which is arranged on the sliding key and moves along with the sliding key.

[0030] As an alternative embodiment of the present invention, optionally, the device further comprises:

[0031] A first temperature acquisition unit, disposed inside the melting furnace, for acquiring temperature data inside the melting furnace;

[0032] A second temperature acquisition unit, disposed inside the titanium tube, for acquiring temperature data of the titanium tube;

[0033] A control module, connected to the first temperature acquisition unit and the second temperature acquisition unit, for controlling the heating temperatures of the heating coil and the preheating coil.

[0034] As an alternative embodiment of the present invention, optionally, the control module is further connected to the driving assembly for adjusting the position of the cement block inside the melting furnace.

[0035] As an alternative embodiment of the present invention, optionally, the device further comprises a nitrogen supply device, which is connected to the graphite mold for providing a positive pressure nitrogen environment inside the graphite mold.

[0036] The beneficial effects of the present invention are as follows: By melting and heating metallic aluminum to a specific temperature and performing metallurgical bonding with a titanium tube preheated to the same temperature in a nitrogen protection environment, the efficient preparation of a titanium-aluminum composite tube is achieved. Compared with traditional methods for manufacturing titanium-aluminum composites, the present invention not only significantly improves the metal bonding strength but also greatly simplifies the manufacturing process and reduces production costs.

[0037] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0039] Figure 1 is a flowchart of a method for manufacturing a titanium-aluminum composite tube according to the present invention.

[0040] Figure 2 is a cross-sectional view of a manufacturing device for a titanium-aluminum composite tube according to the present invention.

[0041] Figure 3 is a schematic diagram of the top structure of a plug according to the present invention.

[0042] Figure 4 is a cross-sectional view of the A-A section according to the present invention.

[0043] In the figure: 1, support frame; 2, melting furnace; 3, graphite mold; 4, heating coil; 5, driver; 6, reducer; 7, lead screw; 8, cement block; 9, discharge port; 10, plug; 11, preheating coil; 12, titanium tube; 13, positioning base; 14, thermocouple hole; 15, positioning groove; 16, aluminum solution inlet; 17, aluminum solution; 18, sliding key; 19, connecting rod. Detailed implementation manners

[0044] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0045] Embodiment 1

[0046] As Figure 1 shown, a method for manufacturing a titanium-aluminum composite tube, the method comprising:

[0047] S1. Melting metallic aluminum to generate an aluminum solution and heating the aluminum solution to 900 degrees Celsius;

[0048] In this embodiment, the metallic aluminum is placed in an aluminum melting furnace, and the metallic aluminum is melted by the aluminum melting furnace to generate an aluminum solution, and the aluminum solution is heated to 900 degrees Celsius.

[0049] S2. Placing a titanium tube in a graphite mold and heating the titanium tube to 900 degrees Celsius;

[0050] In this embodiment, the titanium tube is vertically installed in the graphite mold, and then the top opening of the titanium tube is blocked by a plug, and the titanium tube is heated to 900 degrees Celsius. The beta transformation temperature of titanium is 882 °C. At this temperature, the atomic activity of titanium is high, and it is easy to form a metallurgical bonding layer. Then, the 900-degree Celsius aluminum solution in the aluminum melting furnace is poured into the graphite mold. During this process, the preheating coil heats the titanium tube to ensure that its temperature is maintained at 900 degrees Celsius to ensure the metallurgical bonding effect between the aluminum solution and the titanium tube. At the same time, a positive pressure nitrogen supply device provides a positive pressure nitrogen environment in the graphite mold, effectively preventing the influence of impurities such as oxygen on the metallurgical bonding process.

[0051] S3. Pouring the 900-degree Celsius aluminum solution into the graphite mold under a positive pressure nitrogen environment, so that the 900-degree Celsius aluminum solution forms a metallurgical bonding layer on the surface of the titanium tube;

[0052] It should be noted that when the aluminum solution is poured into the graphite mold in step S3, since both the titanium tube and the aluminum solution are at a high temperature of 900 degrees Celsius, and the graphite mold provides good thermal conductivity, a uniform metallurgical bonding layer can be rapidly formed on the surface of the titanium tube by the aluminum solution. This metallurgical bonding layer not only has high strength but also good corrosion resistance, and can meet the performance requirements of titanium-aluminum composite tubes in high-end fields. During the pouring process, the nitrogen supply device continuously provides a positive-pressure nitrogen environment into the graphite mold, effectively removing oxygen and other impurities in the mold, and ensuring the purity of the metallurgical bonding process. At the same time, nitrogen also plays a cooling role, helping the rapid solidification of the aluminum solution and further improving the production efficiency.

[0053] S4. Cool the mold with cold air until the aluminum solution and the titanium tube in the mold are completely cooled to obtain a titanium-aluminum composite tube.

[0054] It should be noted that rapidly and uniformly cooling the mold with cold air in step S4 can ensure that the aluminum solution and the titanium tube in the mold cool at a stable rate. This process not only helps to maintain the uniformity and integrity of the metallurgical bonding layer but also effectively prevents internal stress and deformation caused by uneven cooling rates. When the aluminum solution and the titanium tube in the mold are completely cooled, a titanium-aluminum composite tube with excellent performance can be obtained. This titanium-aluminum composite tube not only has high metal bonding strength but also good corrosion resistance, is light in weight and high in strength, and is especially suitable for high-end fields such as aerospace, petrochemical, and automotive manufacturing.

[0055] The titanium-aluminum composite tube manufactured through the above process has been verified through performance tests and practical applications, showing excellent performance indicators. Its metal bonding strength has been significantly improved, effectively solving the problem of poor metal bonding strength in traditional titanium-aluminum composite manufacturing methods. The specific performance test method is as follows: First, cut the titanium-aluminum composite tube sample to prepare a specimen that meets the test standard; then use a universal testing machine to conduct a tensile test on the specimen, record the maximum load and fracture position during the tensile process; finally, calculate the metal bonding strength based on the test results. The test results show that the metal bonding strength of the titanium-aluminum composite tube of the present invention is 428 MPa.

[0056] Comparative Example 1: Explosion bonding method

[0057] Manufacturing method:

[0058] Material preparation: Titanium plate (base layer, thickness 5 - 10 mm), aluminum plate (clad layer, thickness 2 - 8 mm), powdered emulsion explosive (detonation velocity 1600 - 1700 m / s), 0.15 mm thick copper foil (supporting material).

[0059] Charge and Support: Place the titanium plate and aluminum plate in the composite order. Fill the gap between the titanium and aluminum with explosive (charge amount: 30 - 50 mm). Install a circular explosion-proof plate and a conical metal cover on the top of the aluminum plate, and install a detonator at the tip of the metal cover.

[0060] Explosion Welding: Detonate the explosive, and use the shock wave to make the titanium and aluminum plates collide at high speed to achieve metallurgical bonding.

[0061] Clean the outer surface of the composite pipe and cut off the unbonded area at the end.

[0062] Explosive Detonation Velocity: 1600 - 1700 m / s;

[0063] Support Material: Copper foil with a thickness of 0.15 mm;

[0064] Charge Amount: 30 - 50 mm;

[0065] Thinning Amount of Aluminum Layer: 0.3 - 1.2 mm.

[0066] Bonding Strength:

[0067] Tensile Strength: 424.7 MPa (measured average value);

[0068] Shear Strength: 72.1 MPa (measured average value).

[0069] Comparative Example 2: Rolling Composite Method

[0070] Manufacturing Method:

[0071] Material Pretreatment: Softening annealing of titanium and aluminum plates (annealing temperature: 650 - 850 °C for titanium plate, 400 - 500 °C for aluminum plate).

[0072] Surface Grinding: Mechanical grinding or shot peening treatment on the surface of the titanium plate (surface roughness 0.1 - 10 μm), and sandpaper grinding on the surface of the aluminum plate.

[0073] Rolling Composite: Single-pass hot rolling for final composite (rolling temperature 350 - 450 °C, rolling reduction ratio 10% - 50%).

[0074] Post-treatment: Diffusion annealing (holding at 470 °C for 24 h) to improve the bonding strength.

[0075] Rolling Temperature: 350 - 450 °C;

[0076] Rolling Reduction Ratio: 10% - 50%;

[0077] Annealing Temperature: 470 °C;

[0078] Annealing Time: 24 h.

[0079] Bonding Strength:

[0080] Interface bonding strength: 73 MPa (rolled at 300 °C, 60% deformation, not annealed);

[0081] Bonding strength after annealing: 72 MPa (rolled at 350 °C, 47.8% deformation, annealed at 470 °C for 24 h).

[0082] Comparative Example 3: Drawing composite method

[0083] Manufacturing method:

[0084] Material preparation: titanium tube (base tube), aluminum tube (liner tube), titanium-aluminum interstitial filling explosive (explosion welding to prepare composite tube blank).

[0085] Drawing forming: The titanium-aluminum tubes are combined by drawing force (drawing speed 10 mm / s, die angle 9°, unilateral clearance 0.2 mm).

[0086] Post-treatment: Cut off the unbonded area at the end.

[0087] Drawing speed: 10 mm / s;

[0088] Die angle: 9°;

[0089] Unilateral clearance: 0.2 mm;

[0090] Coefficient of friction: <0.15.

[0091] Bonding strength:

[0092] Minimum bonding strength: 50 MPa (required for forming of composite elbow by pushing and bending).

[0093] Comparative Example 4: Diffusion welding composite method

[0094] Manufacturing method:

[0095] Material pretreatment: Mechanical grinding (800-mesh sandpaper) and chemical cleaning (soaking in acetone and alcohol) of the surface of titanium-aluminum plates.

[0096] Assembly: The titanium-aluminum plates are closely fitted (clearance <0.05 mm) and loaded into a special fixture.

[0097] Diffusion welding: Heating (600 - 620 °C) in a vacuum environment, holding for heat preservation (60 min), applying pressure (7 - 12 MPa).

[0098] Post-treatment: Slowly cool to 300 °C and then air-cool.

[0099] Welding temperature: 600 - 620 °C;

[0100] Heat preservation time: 60 min;

[0101] Pressure: 7 - 12 MPa;

[0102] Vacuum degree: 5×10 -4 Pa.

[0103] Bonding strength:

[0104] Tensile strength of the joint: 214 MPa (using L4 aluminum foil as the intermediate layer, measured average value).

[0105] Compare using Chart 1:

[0106]

[0107]

[0108] As can be seen from Chart 1 above, the manufacturing method of the titanium-aluminum composite pipe in this embodiment shows obvious advantages in bonding strength compared with the explosion bonding method of Comparative Example 1, the rolling bonding method of Comparative Example 2, the drawing bonding method of Comparative Example 3, and the diffusion welding method of Comparative Example 4. At the same time, the method of this embodiment is also more excellent in terms of process complexity and cost control. Specifically, although the explosion bonding method has high bonding strength, it has high costs, great manufacturing difficulty, and complex equipment; the rolling bonding method is suitable for sheet metal composite, but the bonding strength is relatively low, and the equipment investment is large; the drawing bonding method has simple process and low cost, but the bonding strength is also relatively low, and it is easy to form brittle phases; the diffusion welding method is suitable for workpieces with complex shapes, but it has low efficiency, long cycle, and is easy to generate brittle phases. In contrast, the manufacturing method of the titanium-aluminum composite pipe in this embodiment not only has high bonding strength, but also has simple process and low cost, and only needs to precisely control the temperature and nitrogen environment to achieve efficient preparation. Therefore, the manufacturing method of the titanium-aluminum composite pipe in this embodiment has broad application prospects and market competitive advantages in high-end fields.

[0109] Example 2

[0110] As Figure 2 and 4 shown, a manufacturing device for a titanium-aluminum composite pipe, used to implement the manufacturing method of the titanium-aluminum composite pipe described in Claim 1, the device includes:

[0111] Support frame 1;

[0112] Aluminum melting furnace, arranged on the support frame 1;

[0113] Heating coil 4, arranged on the aluminum melting furnace, used to heat metallic aluminum;

[0114] Positioning base 13, arranged on one side of the aluminum melting furnace and close to the discharge port 9 of the aluminum melting furnace;

[0115] Graphite mold 3, arranged on the positioning base 13;

[0116] The preheating coil 11 is arranged on the graphite mold 3 and is used for heating the titanium tube 12;

[0117] The plug 10 is arranged inside the titanium tube 12 and is located at the top of the graphite mold 3. An aluminum solution inlet 16 is arranged between the plug 10 and the graphite mold 3, and the aluminum solution enters the graphite mold 3 through the aluminum solution inlet 16.

[0118] As Figure 3 shown, during use, the plug 10 is installed at the top of the titanium tube 12 to prevent the aluminum solution from entering the titanium tube 12; four aluminum solution inlets 16 are provided on the plug 10, which are used to flow the aluminum solution flowing out of the discharge port 9 into the graphite mold 3 through the aluminum solution inlets 16.

[0119] During use, first place the metallic aluminum in the aluminum melting furnace, and use the heating coil 4 installed on the aluminum melting furnace to melt the metallic aluminum until the metallic aluminum is completely melted and the aluminum solution in the aluminum melting furnace reaches 900 degrees Celsius. Subsequently, divert the aluminum solution to the graphite mold 3 through the discharge port 9 of the aluminum melting furnace. During this process, the preheating coil 11 continuously heats the titanium tube 12 to ensure that its temperature is maintained at 900 degrees Celsius to ensure the metallurgical bonding effect between the aluminum solution and the titanium tube. At the same time, a nitrogen supply device (not shown in the figure) provides a positive pressure nitrogen environment into the graphite mold 3, effectively preventing the influence of impurities such as oxygen on the metallurgical bonding process.

[0120] To further ensure that the aluminum solution can be uniformly and stably poured into the titanium tube 12, the present invention also provides a driving assembly. The driving assembly drives the reducer 6 through the driver 5, and then drives the lead screw 7 to rotate. The sliding key 18 on the lead screw 7 moves accordingly, and then drives the connecting rod 19 and the cement block 8 connected thereto to move up and down in the melting furnace. When the cement block 8 moves downward, the liquid level of the aluminum solution in the aluminum melting furnace rises. When the liquid level of the aluminum solution exceeds the height of the discharge port 9, the aluminum solution flows from the discharge port 9 into the graphite mold 3 equipped with the titanium tube 12.

[0121] After the aluminum solution is completely poured into the graphite mold 3, the driver 5 of the driving assembly rotates in the reverse direction. At this time, the lead screw 7 drives the sliding key 18 to move upward, and at the same time drives the cement block 8 to move upward. During the upward movement of the cement block 8, the liquid level of the aluminum solution in the aluminum melting furnace decreases until the liquid level of the aluminum solution is lower than the discharge port 9. At this time, the discharge port 9 stops discharging the aluminum solution, and the graphite mold 3 is quickly and uniformly cooled by cold air. This process can ensure that the aluminum solution and the titanium tube 12 in the mold are cooled at a stable rate, thereby maintaining the uniformity and integrity of the metallurgical bonding layer. When the aluminum solution and the titanium tube 12 in the graphite mold 3 are completely cooled, a titanium-aluminum composite tube with excellent performance can be obtained.

[0122] As an alternative embodiment of the present invention, optionally, a thermocouple hole 14 is provided at the bottom of the positioning base 13.

[0123] As Figure 2 shown, the thermocouple hole 14 is provided on the center line at the bottom of the positioning base 13. The setting of the thermocouple hole 14 facilitates the insertion of a thermocouple to monitor the temperature change inside the graphite mold 3 in real time. Through the accurate measurement of the thermocouple, it can be ensured that the temperature of the titanium tube 12 and the aluminum solution during the metallurgical bonding process is always maintained within a preset range, that is, 900 degrees Celsius, thereby further improving the quality and strength of the metallurgical bonding layer. The use of the thermocouple not only improves the accuracy of temperature control but also helps to detect and correct temperature deviations in a timely manner, ensuring the stability and reliability of the entire manufacturing process.

[0124] As an alternative embodiment of the present invention, optionally, the bottom of the positioning base 13 is provided with a protrusion matching the bottom hole of the titanium tube 12 and a positioning groove 15 matching the graphite mold 3.

[0125] As Figure 2 shown, the protrusion provided at the bottom of the positioning base 13 matches the bottom hole of the titanium tube 12, which can effectively fix the titanium tube 12 and prevent it from moving or tilting during the process of pouring the aluminum solution. At the same time, the positioning groove 15 provided on the positioning base 13 matches the graphite mold 3, which can ensure that the titanium tube 12 can be accurately aligned with the graphite mold 3 during installation, thereby ensuring that the aluminum solution can be evenly poured on the surface of the titanium tube 12. This design not only improves the accuracy and stability of the manufacturing process but also helps to improve the quality of the titanium-aluminum composite tube.

[0126] As an alternative embodiment of the present invention, optionally, nitrogen is provided between the graphite mold 3 and the titanium tube 12.

[0127] As Figure 2 shown, it should be noted that nitrogen is continuously supplied to the gap between the graphite mold 3 and the titanium tube 12 through a nitrogen supply device (not shown in the figure). The continuous supply of nitrogen not only effectively removes oxygen and other impurities in the mold, ensuring the purity of the metallurgical bonding process, but also plays a role in heat insulation and cooling, helping the aluminum solution to solidify quickly and improving the production efficiency.

[0128] As an alternative embodiment of the present invention, optionally, the aluminum melting furnace includes:

[0129] A melting furnace 2, which is arranged on the support frame 1 and is internally provided with an aluminum solution 17;

[0130] A cement block 8, which is suspended in the melting furnace 2 through a driving component.

[0131] As Figure 2As shown, the cement block 8 is suspended in the melting furnace 2 by a driving assembly, and its height in the melting furnace 2 is driven by the driving assembly, so as to control the height of the aluminum solution in the melting furnace 2 by using the cement block 8.

[0132] As an alternative embodiment of the present invention, optionally, the driving assembly includes:

[0133] A driver 5, arranged on the support frame 1; in this embodiment, the driver 5 is a servo motor and is installed on the support frame 1 by screws;

[0134] A speed reducer 6, arranged on the output shaft of the driver 5;

[0135] A lead screw 7, arranged on the output shaft of the speed reducer 6;

[0136] A sliding key 18, movably arranged on the lead screw 7; the sliding key 18 is a slider.

[0137] A connecting rod 19, arranged on the sliding key 18 and moving along with the sliding key 18.

[0138] As Figure 1 As shown, when the driving assembly is in use, it is used to adjust the height of the cement block 8. Specifically, when the height of the cement block 8 needs to be lowered, the driver 5 drives the speed reducer 6 by forward rotation, and then drives the lead screw 7 to rotate forward. The sliding key 18 on the lead screw 7 moves downward accordingly, and then drives the connecting rod 19 and the cement block 8 connected thereto to descend in the melting furnace 2. When the cement block 8 descends, the liquid level of the aluminum solution 17 in the melting furnace 2 rises accordingly. When the height of the cement block 8 needs to be raised, the driver 5 drives the speed reducer 6 by reverse rotation, and then drives the lead screw 7 to rotate reversely. The sliding key 18 on the lead screw 7 moves upward accordingly, and then drives the connecting rod 19 and the cement block 8 connected thereto to rise in the melting furnace 2. When the cement block 8 rises, the liquid level of the aluminum solution 17 in the melting furnace 2 drops accordingly. Through this precise height adjustment, precise control of the aluminum solution filling amount can be achieved, thereby ensuring the production quality of the titanium-aluminum composite pipe.

[0139] As an alternative embodiment of the present invention, optionally, the device further includes:

[0140] A first temperature acquisition unit, arranged in the melting furnace 2 and used to acquire the temperature data in the melting furnace 2;

[0141] It should be noted that in this embodiment, the first temperature acquisition unit is a temperature acquisition sensor, which is installed in the melting furnace 2 and used to monitor the temperature in the melting furnace 2 in real time to ensure the temperature stability of the aluminum solution during the melting process. When the temperature exceeds the preset range, the first temperature acquisition unit will send a signal to the control system, and the control system will adjust the heating power of the heating coil 4 according to the signal, so as to achieve precise control of the temperature in the melting furnace 2.

[0142] A second temperature acquisition unit, which is arranged in the titanium tube 12 and used to acquire the temperature data of the titanium tube 12;

[0143] It should be noted that in this embodiment, the second temperature acquisition unit is a thermocouple, and the thermocouple is installed in the titanium tube 12 through the thermocouple hole 14 and used to monitor the temperature change of the titanium tube 12 during the heating process. When the temperature of the titanium tube 12 reaches the preset value, the second temperature acquisition unit will send a signal to the control system, and the control system will adjust the heating power of the preheating coil 11 according to the signal, so as to ensure that the metallurgical bonding effect between the titanium tube 12 and the aluminum solution reaches the best.

[0144] A control module, which is connected to the first temperature acquisition unit and the second temperature acquisition unit and used to control the heating temperatures of the heating coil 4 and the preheating coil 11.

[0145] It should be noted that in this embodiment, the control module is a PLC programmable controller, which precisely controls the heating temperatures of the heating coil 4 and the preheating coil 11 through a preset program. The PLC programmable controller receives the temperature data sent by the first temperature acquisition unit and the second temperature acquisition unit, and automatically adjusts the heating power of the heating coil 4 and the preheating coil 11 according to the preset temperature range and control strategy to ensure that the temperatures of the titanium tube 12 and the aluminum solution during the metallurgical bonding process are always maintained within the best range. This precise temperature control not only improves the quality and strength of the metallurgical bonding layer, but also helps to improve the production efficiency and stability of the titanium-aluminum composite tube. At the same time, the PLC programmable controller also has a fault alarm and self-protection function. When a fault or abnormal temperature occurs in the equipment, it can automatically stop and send an alarm signal to ensure the safety of the equipment and the operator.

[0146] As an optional embodiment of the present invention, optionally, the control module is also connected to the driving assembly and used to adjust the position of the cement block 8 in the melting furnace 2.

[0147] As Figure 2 shown, it should be noted that the control module is electrically connected to the driver 5 of the driving assembly and used to control the forward and reverse rotation and the rotation speed of the driver 5, so as to achieve precise adjustment of the height of the cement block 8 in the melting furnace 2. Through this precise position control, the stability and accuracy of the aluminum solution pouring amount can be further ensured, and the production precision and quality of the titanium-aluminum composite tube can be improved.

[0148] As an alternative embodiment of the present invention, optionally, the device further includes a nitrogen supply device, which is connected to the graphite mold 3 and is used to provide a positive-pressure nitrogen environment inside the graphite mold 3.

[0149] It should be noted that in this embodiment, the nitrogen supply device is specifically a combination of a nitrogen cylinder and a nitrogen delivery pipeline. The nitrogen cylinder stores high-pressure nitrogen, and the nitrogen is delivered into the graphite mold 3 through the nitrogen delivery pipeline. A pressure gauge and a flow control valve are provided on the nitrogen delivery pipeline to monitor and control the pressure and flow rate of nitrogen, ensuring the stability and controllability of the nitrogen environment inside the graphite mold 3. Through this nitrogen supply method, it is possible to effectively prevent impurities such as oxygen from entering the graphite mold 3, ensuring the purity and quality of the metallurgical bonding process. At the same time, the continuous supply of nitrogen also plays a role in heat insulation and cooling, contributing to the rapid solidification of the aluminum solution and the production efficiency of the titanium-aluminum composite pipe.

[0150] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A manufacturing method of a titanium-aluminum composite pipe, characterized in that, The method includes: Melting metallic aluminum to generate an aluminum solution, and heating the aluminum solution to 900 degrees Celsius; Placing a titanium tube in a graphite mold, and heating the titanium tube to 900 degrees Celsius; Under a positive-pressure nitrogen environment, pouring the 900-degree Celsius aluminum solution into the graphite mold so that the 900-degree Celsius aluminum solution forms a metallurgical bonding layer on the surface of the titanium tube; Using cold air to cool the mold until the aluminum solution and the titanium tube in the mold are completely cooled to obtain a titanium-aluminum composite tube.

2. A manufacturing device for a titanium-aluminum composite pipe, which is used to implement the manufacturing method of the titanium-aluminum composite pipe described in Claim 1 above, characterized in that, The equipment includes: A support frame (1); An aluminum melting furnace, arranged on the support frame (1); A heating coil (4), arranged on the aluminum melting furnace for heating metallic aluminum; A positioning base (13), arranged on one side of the aluminum melting furnace and close to the discharge port (9) of the aluminum melting furnace; A graphite mold (3), arranged on the positioning base (13); A preheating coil (11), arranged on the graphite mold (3) for heating the titanium tube (12); A plug (10), arranged inside the titanium tube (12) and at the top of the graphite mold (3). An aluminum solution inlet (16) is arranged between the plug (10) and the graphite mold (3), and the aluminum solution enters the graphite mold (3) through the aluminum solution inlet (16).

3. The manufacturing equipment of the titanium-aluminum composite pipe according to claim 2, characterized in that, A thermocouple hole (14) is arranged at the bottom of the positioning base (13).

4. The manufacturing equipment for the titanium-aluminum composite pipe according to claim 2, characterized in that, A protrusion matching the bottom hole of the titanium tube (12) and a positioning groove (15) matching the graphite mold (3) are arranged at the bottom of the positioning base (13).

5. The manufacturing equipment for the titanium-aluminum composite pipe according to claim 2, characterized in that, Nitrogen is arranged between the graphite mold (3) and the titanium tube (12).

6. The manufacturing equipment of the titanium-aluminum composite pipe according to claim 2, characterized in that, The aluminum melting furnace includes: A melting furnace (2), arranged on the support frame (1) and internally provided with an aluminum solution (17); A cement block (8), suspended in the melting furnace (2) through a driving assembly.

7. The manufacturing equipment for the titanium-aluminum composite pipe according to claim 6, characterized in that, The driving assembly includes: A driver (5), arranged on the support frame (1); A reducer (6), arranged on the output shaft of the driver (5); A lead screw (7), arranged on the output shaft of the reducer (6); A sliding key (18), movably arranged on the lead screw (7); A connecting rod (19), arranged on the sliding key (18) and moving along with the sliding key (18).

8. The manufacturing equipment of the titanium-aluminum composite pipe according to claim 7, characterized in that, The equipment further includes: A first temperature acquisition unit, arranged inside the melting furnace (2) for acquiring temperature data inside the melting furnace (2); A second temperature acquisition unit, arranged inside the titanium tube (12) for acquiring temperature data of the titanium tube (12); A control module, connected to the first temperature acquisition unit and the second temperature acquisition unit for controlling the heating temperature of the heating coil (4) and the preheating coil (11).

9. The manufacturing equipment of the titanium-aluminum composite pipe according to claim 8, characterized in that, The control module is further connected to the driving assembly for adjusting the position of the cement block (8) inside the melting furnace (2).

10. The manufacturing equipment of the titanium-aluminum composite pipe according to claim 2, characterized in that, The equipment further includes a nitrogen supply device, and the nitrogen supply device is connected to the graphite mold (3) for providing a positive-pressure nitrogen environment to the graphite mold (3).

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