TC4 titanium alloy external adjusting sheet product, mold and forming method

Abstract

The invention provides a TC4 titanium alloy external adjusting sheet product, a mold and a forming method, and relates to the technical field of aerospace. The problems that at present, spot welding and seam welding are usually adopted for products of the type, electrode loss is prone to being generated, the surface temperature of a weldment is high during welding, the electrode is prone to adhering to the surface of the weldment, and a roller and an electrode tip are abraded are solved. The die comprises an upper die, a blank pressing die, a lower die, at least one pair of guide blocks and a plurality of stop pins, grooves matched with the guide blocks are symmetrically formed in the outer walls of the upper die, the blank pressing die and the lower die in the longitudinal direction, the lower die, the blank pressing die and the upper die are sequentially stacked from bottom to top, the lower portions of the guide blocks are installed in the grooves of the lower die, and the stop pins are arranged in the grooves of the lower die. A plurality of pairs of pin shaft holes are longitudinally formed in the bottom face of the upper die and the top face of the blank pressing die, the positions of the pin shaft holes are opposite, and the two ends of the stop pin are installed in the pair of pin shaft holes. The method is mainly used for manufacturing TC4 titanium alloy external adjusting sheet products.

Description

Technical Field

[0001] This invention relates to the field of aerospace technology, specifically to a TC4 titanium alloy external adjustment plate product, mold, and forming method. Background Technology

[0002] In the aerospace field, external control strips have always been a crucial component of aircraft, their performance directly affecting the stability of the aircraft's flight attitude. Currently, these products are commonly manufactured using a "spot welding + seam welding" process. This method is prone to electrode wear issues. The high surface temperature of the workpiece during welding easily causes the electrode to adhere to the workpiece surface, leading to wear on the rollers and electrode heads. Wear on the seam welding rollers is particularly severe, and even enhanced water cooling is insufficient to improve the situation. Frequent electrode repairs or replacements delay production and further increase overall costs. Furthermore, all operations are manual, and the welding quality depends heavily on the operator's skill level, making it difficult to guarantee consistent quality.

[0003] Diffusion welding is an advanced joining technology with advantages such as high joint quality, small component deformation, high dimensional accuracy, and consistent welding quality. Furthermore, diffusion welding can simultaneously weld multiple components, making it particularly suitable for welding structural parts with multiple layers, sandwich structures, and complex cavities. Summary of the Invention

[0004] In view of this, and to solve the above problems, this invention proposes a TC4 titanium alloy external adjustment plate product, mold, and forming method. A dedicated mold is designed, and one set of molds can be used for both thermoforming and welding processes. The TC4 titanium alloy external adjustment plate product is obtained through local diffusion welding, resulting in high welding quality.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a TC4 titanium alloy outer adjustment plate product, comprising an inner shell A, an inner shell B and an outer adjustment plate, wherein both the inner shell A and the inner shell B are mounted on the outer adjustment plate; The inner shell A is a shell structure with an upward-protruding cavity in the middle of the plate, which includes a central cavity and a circumferential plate connected to each other. The inner shell B is also a shell structure with a cavity protruding upward in the middle of the plate, which includes a central cavity two and a circumferential plate two connected to each other; The bottom surfaces of both the first and second circumferential plates are connected to the top surface of the outer adjusting plate, and the sidewalls of the first circumferential plate are connected to the sidewalls of the second circumferential plate. The top surface of the external adjustment plate is concave, and the bottom surface is convex.

[0006] A mold for manufacturing the TC4 titanium alloy external adjustment plate product includes an upper mold, a blank holder mold, a lower mold, at least a pair of guide blocks, and multiple stop pins. The outer walls of the upper mold, blank holder mold, and lower mold are symmetrically provided with grooves that fit with the guide blocks along the longitudinal direction. The lower mold, blank holder mold, and upper mold are stacked sequentially from bottom to top. The lower part of the guide block is installed in the groove of the lower mold, and the upper part is slidably connected with the groove of the blank holder mold and the groove of the upper mold. The bottom surface of the upper mold and the top surface of the blank holder mold are provided with multiple pairs of pin holes that are positioned opposite each other along the longitudinal direction. The two ends of the stop pins are installed in a pair of pin holes. The bottom surface of the upper mold is a concave surface that matches the bottom surface of the outer adjusting plate; The pressing die is longitudinally provided with through holes one and two, which have the same opening shapes as the central cavity one and the central cavity two, respectively; The top surface of the lower die is provided with protrusions 1 and 2, which have the same shape as through hole 1 and through hole 2, respectively. Protrusion 1 is slidably connected to through hole 1, and protrusion 2 is slidably connected to through hole 2. The top surface of protrusion 1, the top surface of protrusion 2, and the top surface of the pressing die together form a convex surface that fits with the top surface of the outer adjusting piece. The lower die is also provided with multiple through holes 3 along the longitudinal direction. Temperature measuring holes are provided laterally on the outer walls of the upper mold and the pressing mold.

[0007] Furthermore, the groove of the lower mold is provided with bolt holes laterally, and the lower part of the guide block is provided with through holes four laterally. The lower part of the guide block is connected to the groove of the lower mold by bolts.

[0008] Furthermore, the outer walls of the upper mold, the pressing mold, and the lower mold are symmetrically provided with multiple pairs of lifting lugs.

[0009] A hot pressing forming method for an external adjustment piece, using the mold described above for manufacturing TC4 titanium alloy external adjustment piece products, includes the following steps; Step 1: Mold assembly and thermocouple installation: Assemble the upper mold, pressing mold, lower mold, guide block and stop pin in the hot press equipment to form a mold, and install thermocouples in the temperature measuring holes. Use the hot press equipment to heat the mold and use the thermocouples to provide real-time feedback on the mold temperature. Step 2, Sheet Material Insulation: After the mold temperature reaches the standard, the upper mold is raised using a hot press equipment and positioned with the help of the stop pin. The sheet material is then placed on the convex surface formed by the top surface of the first protrusion, the second protrusion, and the pressing die to insulate the sheet material. Step 3, Pressure Forming: After the sheet material has been kept warm for the required time, the upper mold is closed and pressure is applied to the upper mold using a hot press. After the thickness is reached, pressure is maintained. After the pressure maintenance time is reached, the pressure is stopped, and the sheet material is pressed into a sheet. Step 4: Cooling: Use a hot press to lift the upper mold, clamp the edge of the plate and remove the plate, then place it flat on refractory bricks to cool naturally to room temperature; Step 5: Cutting and shaping: Cut the plate to obtain the outer adjustment piece.

[0010] Furthermore, in step one, the mold is heated to 790°C.

[0011] Furthermore, in step two, after placing the sheet material, the upper mold is lowered to a distance of 20mm from the sheet material using a hot press, and the sheet material is kept warm for 3-4 minutes.

[0012] Furthermore, in step three, the hot pressing equipment applies a pressure of 60t to the upper mold, and the pressure holding time is usually 4-5 minutes.

[0013] A diffusion welding forming method for a TC4 titanium alloy external adjustment plate product, using the mold for manufacturing the TC4 titanium alloy external adjustment plate product, includes the following steps; Step 1: Mold Preparation and Thermocouple Installation: Assemble the upper mold, pressing mold, lower mold, guide block, and stop pin in the hot press to form a mold. Use the hot press to lift the upper mold, and use the hot press push rod to lift the pressing mold through the through hole three, so that the through holes one and two can respectively accommodate the central cavity one and central cavity two. Install thermocouples in the temperature measuring holes to provide real-time feedback on the mold temperature. Step 2: Assembly of workpiece and mold: Install inner shell A and inner shell B on the top surface of the pressure die through through holes 1 and 2, place the outer adjusting plate on inner shell A and inner shell B, and use a hot pressing device to lower the upper mold until it contacts the outer adjusting plate; Step 3: Heating: The mold is heated and kept warm in stages using a hot press. Step 4: Apply pressure for diffusion welding: Maintain the mold temperature using a hot press and apply pressure and hold pressure in stages on the upper mold. Step 5: Cooling down: The hot pressing equipment stops heating the mold, reduces the pressure applied to the upper mold and maintains the pressure. After the TC4 titanium alloy outer regulating plate product cools to room temperature, the pressure applied to the upper mold is stopped. Step 6: Remove: Use a hot press to lift the upper mold and remove the TC4 titanium alloy outer adjustment piece, completing the diffusion welding of the TC4 titanium alloy outer adjustment piece product.

[0014] Furthermore, the specific process of stage heating and heat preservation in step three is as follows: S1. Within 20 minutes, raise the mold temperature to 350℃, and then maintain the mold temperature at 350±10℃ for 60 minutes. S2. Within 30 minutes, raise the mold temperature to 600℃, and then maintain the mold temperature at 600±10℃ for 60 minutes. S3. Within 20 minutes, raise the mold temperature to 800℃, and then maintain the mold temperature at 800±10℃ for 60 minutes. S4. Within 20 minutes, raise the mold temperature to 920℃, and then maintain the mold temperature at 920±10℃ for 60 minutes. In step four, maintaining the mold temperature at 920±10℃ and performing staged pressurization and pressure holding on the upper mold are as follows: T1. Increase the pressure applied to the upper mold to 10kN and hold the pressure for 60 minutes; T2. Increase the pressure applied to the upper mold to 14kN and hold the pressure for 60 minutes; T3. Increase the pressure applied to the upper mold to 17kN and hold the pressure for 60 minutes; T4. Increase the pressure applied to the upper mold to 20kN and hold the pressure for 180min; In step five, the pressure applied to the upper mold is reduced to 5 kN.

[0015] Compared with the prior art, the beneficial effects of the TC4 titanium alloy external adjustment plate product, mold, and forming method described in this invention are: 1. This invention designs a special mold for the structure of TC4 titanium alloy external adjustment plate products. One set of molds can be used for both hot pressing and welding of TC4 titanium alloy external adjustment plate products, reducing mold investment costs and saving production costs.

[0016] 2. The thermoforming and welding processes of the mold described in this invention both use hot pressing equipment. Therefore, the thermoforming and welding processes can be carried out continuously. The two processes are carried out continuously using the same set of production equipment, which saves mold disassembly and clamping time and improves production efficiency.

[0017] 3. The top surfaces of protrusion one, protrusion two, and the pressure die together form a convex surface that matches the top surface of the outer adjusting piece. During the thermoforming process, the downward pressure of the upper die may cause the sheet metal to move around. Therefore, this invention is equipped with a stop pin. First, the stop pin can prevent the sheet metal from moving around during the downward pressure of the upper die. Second, because the operator is located near the furnace during the thermoforming process and has poor visibility while wearing heat-insulating clothing, the stop pin can serve as a reference for the material to be placed, helping the operator to judge and determine the placement position.

[0018] 4. When the mold described in this invention is used for diffusion welding, the push rod of the hot pressing equipment is used to lift the pressure die through the through hole three, so that the through hole one and through hole two can respectively accommodate the central cavity one and central cavity two. The pressure applied by the mold mainly acts on the part of the TC4 titanium alloy outer adjustment plate product that needs to be welded, to prevent the central cavity one and central cavity two from being subjected to pressure, which would cause deformation of the cavity part. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of the TC4 titanium alloy external adjustment plate product described in this invention; Figure 2 This is a schematic diagram of the structure of the external adjustment plate described in this invention; Figure 3 An exploded view of the TC4 titanium alloy external adjustment plate product described in this invention. Figure 1 ; Figure 4 An exploded view of the TC4 titanium alloy external adjustment plate product described in this invention. Figure 2 ; Figure 5 This is an exploded view of a mold used to manufacture the TC4 titanium alloy external adjustment plate product according to the present invention. Figure 1 ; Figure 6 This is an exploded view of a mold used to manufacture the TC4 titanium alloy external adjustment plate product according to the present invention. Figure 2 ; Figure 7 For the present invention Figure 5 The main view; Figure 8 This is a bottom view of the upper mold described in this invention; Figure 9 This is a top view of the pressing die described in this invention; Figure 10 This is a top view of the lower mold described in this invention; Figure 11 This is a schematic diagram of the mold described in this invention when the hot pressing equipment lifts the upper mold during the thermoforming process; Figure 12 This is a schematic diagram of the mold structure of the present invention when the hot pressing equipment lifts the upper mold and the push rod lifts the pressing mold during the diffusion welding process; In the diagram: 11-Inner shell A; 12-Inner shell B; 13-Outer adjusting plate; 111-Central cavity one; 121-Central cavity two; 1-Upper die; 2-Pressure die; 3-Lower die; 4-Guide block; 5-Stop pin; 6-Pin hole; 7-Temperature measuring hole; 21-Through hole one; 22-Through hole two; 31-Protrusion one; 32-Protrusion two; 33-Through hole three. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0021] I. Detailed Implementation Method 1, see [link / reference] Figure 1-12 This embodiment describes a TC4 titanium alloy external adjustment plate product, which includes an inner housing A11, an inner housing B12, and an external adjustment plate 13, wherein both the inner housing A11 and the inner housing B12 are mounted on the external adjustment plate 13. The inner shell A11 is a shell structure with an upward bulge in the middle of the plate, shaped like a "hat". It includes a central cavity 111 and a circumferential plate connected to each other. The inner shell B12 is also a shell structure with an upward bulge in the middle of the plate, shaped like a "hat". It includes a central cavity 121 and a circumferential plate connected to each other. The bottom surfaces of both the first and second circumferential plates are connected to the top surface of the outer adjusting plate 13, and the sidewalls of the first circumferential plate are connected to the sidewalls of the second circumferential plate. The top surface of the external adjustment plate 13 is concave, and the bottom surface is convex.

[0022] A mold for manufacturing the TC4 titanium alloy external adjustment plate product includes an upper mold 1, a blank holder mold 2, a lower mold 3, at least a pair of guide blocks 4, and multiple stop pins 5. The outer walls of the upper mold 1, the blank holder mold 2, and the lower mold 3 are symmetrically provided with grooves that fit with the guide blocks 4 along the longitudinal direction. The lower mold 3, the blank holder mold 2, and the upper mold 1 are stacked sequentially from bottom to top. The lower part of the guide block 4 is installed in the groove of the lower mold 3, and the upper part is slidably connected to the groove of the blank holder mold 2 and the groove of the upper mold 1. The bottom surface of the upper mold 1 and the top surface of the blank holder mold 2 are provided with multiple pairs of pin holes 6 in opposite positions along the longitudinal direction. The two ends of the stop pins 5 are installed in a pair of pin holes 6. The bottom surface of the upper mold 1 is a concave surface that matches the bottom surface of the outer adjusting piece 13; The pressing die 2 is longitudinally provided with through holes 21 and 22, which have the same opening shapes as the central cavity 111 and the central cavity 221, respectively. The top surface of the lower mold 3 is provided with protrusions 31 and 32, which have the same shape as through hole 21 and through hole 22, respectively. Protrusion 31 is slidably connected to through hole 21, and protrusion 32 is slidably connected to through hole 22. The top surfaces of protrusion 31, protrusion 32, and the top surface of the pressing mold 2 together form a convex surface that fits with the top surface of the outer adjusting piece 13. The lower mold 3 is also provided with a plurality of through holes 33 along the longitudinal direction. Temperature measuring holes 7 are provided laterally on the outer walls of the upper mold 1 and the pressing mold 2.

[0023] The groove of the lower mold 3 is provided with bolt holes in the horizontal direction, and the lower part of the guide block 4 is provided with through holes in the horizontal direction. The lower part of the guide block 4 is connected to the groove of the lower mold 3 by bolts.

[0024] The outer walls of the upper mold 1, the pressing mold 2, and the lower mold 3 are symmetrically provided with multiple pairs of lifting lugs.

[0025] Preferably, the guide blocks 4 are a pair, the stop pins 5 are three, the pin holes 6 are three pairs, the through holes 33 are four, and the lifting lugs are two pairs.

[0026] A hot pressing forming method for an external adjustment piece, using the mold described above for manufacturing TC4 titanium alloy external adjustment piece products, includes the following steps; Step 1: Mold assembly and thermocouple installation: Assemble the upper mold 1, pressing mold 2, lower mold 3, guide block 4 and stop pin 5 in the hot press equipment to form a mold, and install thermocouples in the temperature measuring hole 7. Use the hot press equipment to heat the mold and use the thermocouples to provide real-time feedback on the mold temperature. Step 2, Sheet Material Insulation: After the mold temperature reaches the standard, the upper mold 1 is raised using a hot press equipment and positioned with the help of the stop pin 5. The sheet material is placed on the convex surface formed by the top surfaces of the first protrusion 31, the second protrusion 32 and the pressing die 32 to insulate the sheet material. Step 3, Pressure Forming: After the sheet material has been kept warm for the required time, the upper mold 1 is closed and pressure is applied to the upper mold 1 using a hot press. After the thickness is reached, pressure is maintained. After the pressure maintenance time is reached, the pressure is stopped on the upper mold 1, and the sheet material is pressed into a sheet. Step 4, Cooling: Use a hot press to lift the upper mold 1, clamp the edge of the plate and remove the plate, then place it flat on the refractory bricks to cool naturally to room temperature; Step 5: Cutting and shaping: Cut the plate to obtain the outer adjustment piece.

[0027] In step one, the mold is heated to 790°C.

[0028] In step two, after placing the sheet material, the upper mold 1 is lowered to a distance of 20mm from the sheet material using a hot pressing device. The sheet material is kept warm for 3-4 minutes. The sheet material needs to be kept warm to a suitable temperature before pressing. Lowering the upper mold 1 to a distance of 20mm from the sheet material can improve the heating effect of the sheet material.

[0029] In step three, the hot pressing equipment applies a pressure of 60t to the upper mold 1, and the pressure holding time is usually 4-5min.

[0030] A diffusion welding forming method for a TC4 titanium alloy external adjustment plate product, using the mold for manufacturing the TC4 titanium alloy external adjustment plate product, includes the following steps; Step 1: Mold preparation and thermocouple installation: Assemble the upper mold 1, pressing mold 2, lower mold 3, guide block 4 and stop pin 5 in the hot press equipment to form a mold. Use the hot press equipment to lift the upper mold 1, and use the hot press equipment push rod to lift the pressing mold through the through hole 33, so that the through hole 21 and through hole 22 can respectively accommodate the central cavity 111 and central cavity 2121. Install the thermocouple in the temperature measuring hole 7, and use the thermocouple to provide real-time feedback on the mold temperature. Step 2, workpiece and mold assembly: The inner housing A11 and inner housing B12 are installed on the top surface of the pressing mold 2 through through holes 1 21 and 2 22, and the central cavities 111 and 121 do not interfere with the protrusions 31 and 32. Then, the outer adjusting piece 13 is placed on the inner housing A11 and inner housing B12. The upper mold 1 is lowered to contact the outer adjusting piece 13 using a hot pressing device, forming an upper and lower clamping pressure on the inner housing A11, inner housing B12 and outer adjusting piece 13 with the top surface of the pressing mold 2. The top surface of the pressing mold 2 acts on the circumferential plate 1 of the inner housing A11 and the circumferential plate 2 of the inner housing B12 to avoid deformation of the central cavities 111 and 112 due to pressure. Before installing the inner housing A11, inner housing B12 and outer adjusting plate 13, the workpieces are precision machined to ensure that the welding surfaces of the inner housing A11, inner housing B12 and outer adjusting plate 13 are very clean and flat, so that the workpieces can fit together tightly during diffusion welding.

[0031] Step 3: Heating: The mold is heated and kept warm in stages using a hot press. Step 4: Apply pressure for diffusion welding: Maintain the mold temperature using a hot press and apply pressure and hold pressure in stages on the upper mold 1. Step 5, Cooling: The hot pressing equipment stops heating the mold and reduces the pressure applied to the upper mold 1 and maintains the pressure. After the TC4 titanium alloy outer regulating plate product cools to room temperature, the pressure applied to the upper mold 1 is stopped. Step 6: Remove: Use a hot press to lift the upper mold 1 and remove the TC4 titanium alloy outer adjustment piece, thus completing the diffusion welding of the TC4 titanium alloy outer adjustment piece product.

[0032] The specific process of stage heating and heat preservation in step three is as follows: S1. Within 20 minutes, raise the mold temperature to 350℃, and then maintain the mold temperature at 350±10℃ for 60 minutes. S2. Within 30 minutes, raise the mold temperature to 600℃, and then maintain the mold temperature at 600±10℃ for 60 minutes. S3. Within 20 minutes, raise the mold temperature to 800℃, and then maintain the mold temperature at 800±10℃ for 60 minutes. S4. Within 20 minutes, raise the mold temperature to 920℃, and then maintain the mold temperature at 920±10℃ for 60 minutes. In step four, maintaining the mold temperature at 920±10℃ and performing staged pressurization and pressure holding on the upper mold 1 are as follows: T1. Increase the pressure applied to the upper mold 1 to 10kN and hold the pressure for 60min; T2. Increase the pressure applied to the upper mold 1 to 14kN and hold the pressure for 60min; T3. Increase the pressure applied to the upper mold 1 to 17kN and hold the pressure for 60min; T4. Increase the pressure applied to the upper mold 1 to 20kN and hold the pressure for 180min; In step five, the pressure applied to the upper mold 1 is reduced to 5 kN.

[0033] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A TC4 titanium alloy external adjustment plate product, characterized in that, It includes an inner shell A (11), an inner shell B (12) and an outer adjusting plate (13), wherein the inner shell A (11) and the inner shell B (12) are both mounted on the outer adjusting plate (13); The inner shell A (11) is a shell structure with an upward convex cavity in the middle of the plate, which includes a central cavity (111) and a circumferential plate connected to each other; The inner shell B (12) is also a shell structure with a cavity protruding upward in the middle of the plate. It includes a central cavity two (121) and a circumferential plate two connected to each other. The bottom surfaces of both the first and second circumferential plates are connected to the top surface of the outer adjusting plate (13), and the side wall of the first circumferential plate is connected to the side wall of the second circumferential plate. The top surface of the external adjustment plate (13) is concave, and the bottom surface is convex.

2. A mold for manufacturing the TC4 titanium alloy external adjustment plate product as described in claim 1, characterized in that, The assembly includes an upper die (1), a pressing die (2), a lower die (3), at least one pair of guide blocks (4), and multiple stop pins (5). The outer walls of the upper die (1), the pressing die (2), and the lower die (3) are symmetrically provided with grooves that fit with the guide blocks (4) along the longitudinal direction. The lower die (3), the pressing die (2), and the upper die (1) are stacked sequentially from bottom to top. The lower part of the guide block (4) is installed in the groove of the lower die (3), and the upper part is slidably connected to the groove of the pressing die (2) and the groove of the upper die (1). The bottom surface of the upper die (1) and the top surface of the pressing die (2) are provided with multiple pairs of pin holes (6) that are positioned opposite each other in the longitudinal direction. The two ends of the stop pins (5) are installed in a pair of pin holes (6). The bottom surface of the upper mold (1) is a concave surface that matches the bottom surface of the outer adjusting piece (13); The pressing die (2) is longitudinally provided with through hole one (21) and through hole two (22) having the same opening shape as the central cavity one (111) and the central cavity two (121), respectively; The lower mold (3) has protrusions 1 (31) and 2 (32) on its top surface, which are the same shape as through hole 1 (21) and through hole 2 (22) respectively. Protrusion 1 (31) is slidably connected to through hole 1 (21), and protrusion 2 (32) is slidably connected to through hole 2 (22). The top surface of protrusion 1 (31), the top surface of protrusion 2 (32) and the top surface of the pressing mold (2) together form a convex surface that fits with the top surface of the outer adjusting piece (13). The lower mold (3) also has multiple through holes 3 (33) along the longitudinal direction. Temperature measuring holes (7) are provided laterally on the outer walls of the upper mold (1) and the pressing mold (2).

3. A mold for manufacturing TC4 titanium alloy external adjustment plates according to claim 2, characterized in that, The groove of the lower mold (3) is provided with bolt holes in the horizontal direction, and the lower part of the guide block (4) is provided with through holes in the horizontal direction. The lower part of the guide block (4) is connected to the groove of the lower mold (3) by bolts.

4. A mold for manufacturing TC4 titanium alloy external adjustment plates according to claim 2, characterized in that, The outer walls of the upper mold (1), the pressing mold (2), and the lower mold (3) are symmetrically provided with multiple pairs of lifting lugs.

5. A hot pressing method for forming an external adjustment sheet, characterized in that, The mold for manufacturing TC4 titanium alloy external adjustment plate products as described in claim 2 includes the following steps; Step 1: Mold assembly and thermocouple installation: Assemble the upper mold (1), pressing mold (2), lower mold (3), guide block (4) and stop pin (5) in the hot pressing equipment to form a mold, and install thermocouples in the temperature measuring hole (7). Use the hot pressing equipment to heat the mold and use the thermocouples to provide real-time feedback on the mold temperature. Step 2, heat preservation of sheet material: After the mold temperature reaches the standard, the upper mold (1) is raised using a hot pressing device and positioned with the help of the stop pin (5). The sheet material is placed on the convex surface formed by the top surfaces of the first protrusion (31), the second protrusion (32) and the pressing die (32) to keep the sheet material warm. Step 3, Pressure forming: After the sheet material has been kept warm for the required time, the upper mold (1) is closed and pressure is applied to the upper mold (1) using a hot press. After the thickness has been met, pressure is maintained. After the pressure maintenance time has been met, pressure is stopped on the upper mold (1) and the sheet material is pressed into a plate. Step 4, Cooling: Use a hot press to lift the upper mold (1), clamp the edge of the plate and remove the plate, then place it flat on the refractory bricks and let it cool naturally to room temperature; Step 5: Cutting and shaping: Cut the plate to obtain the outer adjustment piece.

6. The hot pressing forming method for an external adjustment sheet according to claim 5, characterized in that, In step one, the mold is heated to 790℃.

7. The hot pressing forming method for an external adjustment sheet according to claim 5, characterized in that, In step two, after placing the sheet material, the upper mold (1) is lowered to a distance of 20mm from the sheet material using a hot press device, and the sheet material is kept warm for 3-4 minutes.

8. The hot pressing forming method for an external adjustment sheet according to claim 5, characterized in that, In step three, the hot pressing equipment applies a pressure of 60t to the upper mold (1) and holds the pressure for 4-5 minutes.

9. A diffusion welding forming method for a TC4 titanium alloy external adjustment plate product, characterized in that, The mold for manufacturing TC4 titanium alloy external adjustment plate products as described in claim 2 includes the following steps; Step 1: Mold preparation and thermocouple installation: Assemble the upper mold (1), pressing mold (2), lower mold (3), guide block (4) and stop pin (5) in the hot press equipment to form a mold. Use the hot press equipment to lift the upper mold (1), and use the hot press equipment push rod to lift the pressing mold through the through hole three (33) so that the through hole one (21) and through hole two (22) can respectively accommodate the central cavity one (111) and the central cavity two (121). Install the thermocouple in the temperature measuring hole (7) and use the thermocouple to provide real-time feedback on the mold temperature. Step 2, workpiece and mold assembly: Install inner shell A (11) and inner shell B (12) on the top surface of the pressing die (2) through through hole 1 (21) and through hole 2 (22), place the outer adjusting piece (13) on the inner shell A (11) and inner shell B (12), and use a hot pressing device to make the upper mold (1) fall down to contact the outer adjusting piece (13); Step 3: Heating: The mold is heated and kept warm in stages using a hot press. Step 4: Apply pressure for diffusion welding: Use a hot press to maintain the mold temperature and apply pressure and hold pressure on the upper mold (1) in stages; Step 5, Cooling: The hot pressing equipment stops heating the mold and reduces the pressure applied to the upper mold (1) and maintains the pressure. After the TC4 titanium alloy outer regulating plate product cools to room temperature, the pressure applied to the upper mold (1) is stopped. Step 6: Remove: Use a hot press to lift the upper mold (1) and remove the TC4 titanium alloy outer adjustment piece to complete the diffusion welding of the TC4 titanium alloy outer adjustment piece product.

10. The diffusion welding forming method for a TC4 titanium alloy external adjustment plate product according to claim 9, characterized in that, The specific process of stage heating and heat preservation in step three is as follows: S1. Within 20 minutes, raise the mold temperature to 350℃, and then maintain the mold temperature at 350±10℃ for 60 minutes. S2. Within 30 minutes, raise the mold temperature to 600℃, and then maintain the mold temperature at 600±10℃ for 60 minutes. S3. Within 20 minutes, raise the mold temperature to 800℃, and then maintain the mold temperature at 800±10℃ for 60 minutes. S4. Within 20 minutes, raise the mold temperature to 920℃, and then maintain the mold temperature at 920±10℃ for 60 minutes. In step four, the mold temperature is maintained at 920±10℃, and the upper mold (1) is subjected to staged pressure application and pressure holding. The specific process is as follows: T1. Increase the pressure applied to the upper mold (1) to 10kN and hold the pressure for 60min; T2. Increase the pressure applied to the upper mold (1) to 14kN and hold the pressure for 60min; T3. Increase the pressure applied to the upper mold (1) to 17kN and hold the pressure for 60min; T4. Increase the pressure applied to the upper mold (1) to 20kN and hold the pressure for 180min; In step five, the pressure applied to the upper mold (1) is reduced to 5 kN.

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