Multi-cavity superplastic forming die for small-size titanium alloy component and forming method of multi-cavity superplastic forming die

Abstract

The invention discloses a multi-cavity superplastic forming die for a small-size titanium alloy component and a forming method thereof.The forming die is composed of an upper die cover, a discharging plate, forming die bodies, a base and positioning pins, and the multiple forming die bodies are located on the base and connected to base positioning grooves in a clamped mode through positioning columns; the upper die cover, the discharging plate and the base are positioned through the positioning holes and the positioning pins; the mold is additionally provided with a set of blowing cooling tool used for assisting the structural part difficult to demold to be discharged out of the furnace. By optimizing the mold structure and the process, efficient forming of products is achieved, and for some titanium alloy components which are large in batch, small in size and complex in shape and structure, the problems that the equipment utilization rate is low and the production efficiency is low when a superplastic forming process is adopted are solved.

Description

Technical Field

[0001] The invention relates to the technical field of nonferrous metal materials and processes, in particular to a multi-cavity superplastic forming die for a small-sized titanium alloy component and a forming method thereof. Background Art

[0002] With the development of aerospace technology, the application scope of titanium alloys in the aerospace field has been continuously expanded, and titanium alloy structural parts are increasingly showing a trend of complex shapes, thin-walled curved surfaces, variable thickness and overall structure. However, titanium alloys have high deformation resistance, severe springback and local cracking at room temperature. Therefore, the commonly used processes at this stage include hot pressing, superplastic forming, superplastic forming / diffusion bonding technology, etc.

[0003] The superplastic forming process can achieve near-net-shape forming of products, simplify the process flow, and improve production efficiency. It is especially suitable for thin-walled parts with complex shapes. Titanium alloy superplastic forming technology is used in missile structural parts, propellant tanks, fairings and engine components in the aerospace industry at home and abroad. However, this process takes about two days to form a furnace of products. For some titanium alloy components with a size of less than 500mm and that need to be produced in large quantities, one furnace per piece of production results in low equipment utilization and relatively low production efficiency. It is urgent to study the multi-cavity superplastic forming mold and forming technology of small-sized titanium alloy components. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art, to provide a multi-cavity superplastic forming die and a forming method for small-sized titanium alloy components, to optimize the die structure and process, to achieve efficient forming of the product, and to solve the problems of low equipment utilization and low production efficiency existing in the superplastic forming process for some titanium alloy components with large batches, small sizes and complex shapes and structures.

[0005] The technical solution of the present invention is: a multi-cavity superplastic forming die for small-sized titanium alloy components, comprising: an upper die cover, a stripper plate, a forming die, a base and a positioning pin;

[0006] A plurality of mold grooves are distributed in the middle of the base for installing the forming mold, and a mold positioning groove is opened in each mold groove; the outer shape of each forming mold is designed to be a column structure, and a positioning column matched with the mold positioning groove is designed at the bottom, and a discharge platform is provided on the top, whose outer diameter is smaller than the outer diameter of the forming mold, and the inside has a cavity for accommodating the blank to be formed, and an exhaust groove is opened at the bottom, and an exhaust hole is provided at the center of the bottom of the cavity through the exhaust groove; a discharge hole is provided in the middle of the discharge plate in accordance with the distribution of each forming mold; the position corresponding to the discharge hole on the upper mold cover is an air cavity, and the center of each air cavity is an air inlet hole, and a sealing ring is fixed around it, and an air inlet pipeline is connected to the center of the upper mold cover, and the air inlet pipeline and each air inlet hole are connected;

[0007] Symmetrical positioning holes are arranged at the edge positions of the base, the unloading plate and the upper die cover. After the upper die cover, the unloading plate, each forming die and the base are installed in sequence, the positioning holes on each component are connected and positioned using positioning pins.

[0008] Furthermore, the multi-cavity superplastic forming mold also has a set of co-used air blowing and cooling tooling to assist in the demolding of structural parts with straight wall features that are difficult to demold. The tooling includes an outer ring, an air pipe, a support rod, a lifting column and an air intake pipe. The air intake pipe is connected to the outer ring and is arranged in a cross inside the outer ring. The air pipes are connected at a position perpendicular to the plane of the outer ring and corresponding to the air inlet holes. Compressed air is introduced through the air intake pipe and enters the forming mold cavity through the air pipes, so that the product can be quickly cooled and shrunk.

[0009] Furthermore, hoisting columns are designed around the upper mold cover, unloading plate, forming mold and base to facilitate the hoisting of the formed structure out of the furnace;

[0010] Equipment fixing plates are designed on both the upper mold cover and the base to respectively install and fix them in the superplastic equipment;

[0011] Temperature measuring holes are evenly arranged around the upper mold cover and the forming mold to facilitate temperature measurement during the forming process.

[0012] Furthermore, the materials used for the upper die cover, the unloading plate, the forming die and the base are Ni7N heat-resistant steel, and the materials used for the air intake pipe and the positioning pins are stainless steel.

[0013] Furthermore, the material used for the air blowing and cooling tooling is stainless steel.

[0014] Furthermore, the assembly clearance between the unloading hole of the unloading plate and the unloading table of the forming mold is 1 to 3 mm on one side, the clearance between the forming mold and the mold groove of the base is 1 to 3 mm on one side, and the clearance between the positioning column and the mold positioning groove is 0.5 to 2 mm on one side; the height of the unloading plate is 1 to 4 mm lower than the height of the unloading table.

[0015] Further, the diameter of the sealing ring is larger than the maximum diameter of the forming mold cavity but smaller than the maximum outer diameter of the unloading platform.

[0016] The present invention also provides a forming method using a multi-cavity superplastic forming die for a small-sized titanium alloy component, comprising the following steps:

[0017] Step 1: Use bolts to fix the upper die cover and the equipment fixing plate of the base of the assembled forming die to the upper platform and lower platform of the superplastic equipment respectively. After installation, remove the positioning pins;

[0018] Step 2: evenly apply solder stop on the inner cavity of the forming mold, the surface of the blank and the lower surface of the upper mold cover, and place the blank on the unloading plate with the center aligned with the center of the forming mold cavity;

[0019] Step 3: Connect the thermocouple, close the furnace door after entering the furnace, heat up the superplastic equipment at a rate of 40-60℃ / h, and the final forming temperature of the mold is 890-910℃. Keep warm for 1h, close the mold on the upper platform and lower it, and execute the air intake program;

[0020] Step 4: After the product is molded, maintain the pressure for 5 to 15 minutes, stop the air intake, raise the upper platform, and cool down to 650 to 800°C with the furnace;

[0021] Step 5: Lift the unloading plate and lift the product out of the oven. For products with straight wall sections that are difficult to remove from the oven, install an air blowing and cooling device above the unloading plate. Each vertical air pipe extends into the forming mold cavity and is connected to compressed air. While blowing and cooling, slowly lift the unloading plate to complete the lifting of the product out of the oven.

[0022] Furthermore, during the furnace loading process in step 2, the blanks are placed independently above the unloading holes corresponding to each forming mold, and the maximum outer diameter of the blank is at least 10 mm larger than the diameter of the sealing ring, and the maximum cannot exceed the center lines of the two unloading holes. If the maximum outer diameter of the blank is smaller than the unloading hole, the blank is overlapped on the unloading plate by welding ears.

[0023] Furthermore, it is suitable for the superplastic forming process of titanium alloy components with specifications and dimensions below 500mm, and can realize the forming of multiple pieces in one furnace.

[0024] The advantages of the present invention compared with the prior art are:

[0025] (1) The present invention provides a multi-cavity superplastic forming die for small-sized titanium alloy components, which can realize superplastic forming of multiple pieces in one furnace, greatly improving equipment utilization and production efficiency, and is particularly suitable for the superplastic forming process of large-scale small-sized products.

[0026] (2) The present invention designs forming molds with the same outer dimensions to share the upper mold cover, unloading plate and base, that is, two products with similar dimensions and specifications are put into production with multiple forming molds, the mold cavities are different, but the mold outer diameters, unloading platform outer dimensions and positioning column dimensions are the same, the upper mold cover, unloading plate and base are shared, so that after one product is formed, another product can be loaded into the furnace within the range of less than 500°C, achieving one furnace production per day, greatly improving production efficiency.

[0027] (3) The positioning holes and positioning pins of the upper mold cover, the unloading plate and the base, as well as the positioning columns of the forming mold and the positioning grooves of the base of the present invention can realize the rapid loading of products into the furnace, reduce the production difficulty and the requirements on the operating level of workers.

[0028] (4) The unloading plate of the present invention can realize all products being taken out of the oven at one time, and the air blowing and cooling tooling can realize the cooling and shrinking of products with straight wall structures so as to quickly take them out of the oven. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is an assembly diagram of a multi-cavity superplastic forming die according to an embodiment of the present invention;

[0030] Figure 2 An exploded view of a multi-cavity superplastic forming die according to an embodiment of the present invention;

[0031] Figure 3 The upper mold cover of the multi-cavity superplastic forming mold according to the embodiment of the present invention;

[0032] Figure 4 It is a stripper plate of a multi-cavity superplastic forming die according to an embodiment of the present invention;

[0033] Figure 5 It is a forming mold of a multi-cavity superplastic forming mold according to an embodiment of the present invention;

[0034] Figure 6 The base of the multi-cavity superplastic forming mold according to the embodiment of the present invention;

[0035] Figure 7 It is an air blowing and cooling tooling of a multi-cavity superplastic forming mold according to an embodiment of the present invention;

[0036] Figure 8 This is a schematic diagram of a blank ear piece according to an embodiment of the present invention;

[0037] Fig. 9 This is a product diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0039] The present invention proposes a multi-cavity superplastic forming die for a small-sized titanium alloy component, such as Figure 1 and Figure 2 As shown, the mold includes: an upper mold cover 1, a stripper plate 2, a forming mold 3, a base 4 and a positioning pin 5. The mold also has a set of air blowing and cooling tooling Figure 7 As shown, the air blowing and cooling tooling is used to assist the difficult-to-demold structural parts to be taken out of the furnace. The air blowing and cooling tooling includes an outer ring 61, an air pipe 62, a support rod 63, a hanging column 64 and an air inlet pipe 65.

[0040] like Figure 3 As shown, the upper mold cover 1 includes a positioning hole 11, a sealing ring 12, an equipment fixing plate 13, an air cavity 14, a hanging column 15, an air inlet pipeline 16, a temperature measuring hole 17 and an air inlet hole 18.

[0041] Specifically, the position on the upper mold cover 1 corresponding to the discharge hole 22 is an air cavity 14, the center of each air cavity is an air inlet hole 18, and a sealing ring 12 is fixed around it. The center of the upper mold cover 1 is connected to an air inlet pipe 16, and the air inlet pipe 16 is connected to each air inlet hole 18 through a five-way structure.

[0042] like Figure 4 As shown, the unloading plate 2 includes a positioning hole 21 , a unloading hole 22 and a hanging column 23 .

[0043] Specifically, a discharge hole 22 is provided in the middle of the discharge plate 2 and is distributed in accordance with the distribution of the forming dies 3 .

[0044] like Figure 5 As shown, the forming mold 3 includes an exhaust groove 31 , a positioning column 32 , a discharge platform 33 , a hanging column 34 , a cavity 35 and a temperature measuring hole 36 .

[0045] Specifically, each forming mold 3 is designed to be a column structure, with a positioning column 32 that matches the mold positioning groove 45 at the bottom, a discharge platform 33 at the top, and an outer diameter smaller than the outer diameter of the forming mold 3. The inside has a cavity 35 for accommodating the blank to be formed, and an exhaust groove 31 is opened at the bottom. The center of the bottom of the cavity 35 has an exhaust hole that penetrates the exhaust groove 31. The cavity 35 of the forming mold is scaled in volume according to the different thermal expansion coefficients of the mold material and the titanium alloy material.

[0046] like Figure 6 As shown, the base 4 includes a positioning hole 41 , an equipment fixing plate 42 , a hanging column 43 , a mold groove 44 and a mold positioning groove 45 .

[0047] Specifically, a plurality of mold grooves 44 are distributed in the middle of the base 4 for installing the forming mold 3 , and a mold positioning groove 45 is formed in each mold groove 44 .

[0048] In summary, after the upper mold cover 1, the unloading plate 2, the forming molds 3 and the base 4 are assembled in sequence, the positioning pins 5 are used to connect and position them through the positioning holes on the components.

[0049] Preferably, the raw materials used for the upper mold cover 1, the unloading plate 2, the forming mold 3 and the base 4 are Ni7N heat-resistant steel, and the raw materials used for the air intake pipe 16 and the positioning pin 5 are stainless steel.

[0050] Preferably, the raw material used for the cold air cooling tooling is stainless steel.

[0051] Preferably, the assembly clearance between the discharge hole 22 of the discharge plate 2 and the discharge platform 33 of the forming mold 3 is 1 to 3 mm on one side, the clearance between the forming mold 3 and the mold groove 44 of the base 4 is 1 to 3 mm on one side, and the clearance between the positioning column 32 and the mold positioning groove 45 is 0.5 to 2 mm on one side, which can prevent assembly interference when the mold expands at high temperature.

[0052] Preferably, the height of the unloading plate 2 is 1 to 4 mm lower than the height of the unloading platform 33, so that the upper mold cover and the forming mold can be well matched, and the part of the blank overlapping the unloading plate sinks in a high temperature environment. The lifting of the unloading plate when taking out of the furnace can prevent the outer wall of the product from deformation.

[0053] Preferably, the diameter of the sealing ring 12 is larger than the maximum diameter of the cavity of the forming mold 3 but smaller than the maximum outer diameter of the unloading platform 33, so as to achieve good sealing and prevent air leakage during superplastic air intake.

[0054] Preferably, after the upper mold cover 1, unloading plate 2, forming mold 3 and base 4 are assembled, the positioning pin 5 cannot be higher than the upper plane of the upper mold cover. After the upper mold plate 1 and base 4 are respectively installed on the upper and lower platforms of the equipment, the positioning pin 5 should be removed.

[0055] The present invention provides a multi-cavity superplastic forming method for a small-sized titanium alloy component, the steps of which are as follows:

[0056] Step 1: Fix the upper mold cover 1 and the equipment fixing plate of the base 4 of the assembled mold to the upper platform and the lower platform of the superplastic equipment with bolts respectively. After installation, remove the positioning pins.

[0057] Step 2: evenly apply solder stopper on the inner cavity of the forming mold 3, the surface of the blank and the lower surface of the upper mold cover 1. The blank is placed above the unloading plate 2 and its center is aligned with the center of the forming mold cavity.

[0058] Step 3: Connect the thermocouple, close the furnace door after entering the furnace, heat up the superplastic equipment at a rate of 40-60°C / h, and the final forming temperature of the mold is 890-910°C. Keep warm for 1 hour, close the mold on the upper platform and lower it, and execute the air intake program.

[0059] Step 4: After the product is molded, maintain the pressure for 5 to 15 minutes, stop the air intake, raise the upper platform, and cool down to 650 to 800°C along with the furnace.

[0060] Step 5: Slowly lift the unloading plate to lift the product out of the oven. For products with straight wall sections that are difficult to remove from the oven, install an air blowing and cooling device above the unloading plate. Each vertical air blowing pipe extends into the forming mold cavity and is connected to compressed air. While blowing and cooling, slowly lift the unloading plate to lift the product out of the oven.

[0061] Preferably, during the furnace loading process, the blanks are placed independently above the discharge holes 22 corresponding to each forming mold 3. The maximum outer diameter of the blank should be more than 10 mm larger than the diameter of the sealing ring 12, and the maximum cannot exceed the center line of the two discharge holes. If the maximum outer diameter of the blank is smaller than the discharge hole, it can be welded by means of ear pieces, such as Figure 8 As shown, it is overlapped on the unloading plate 2, so that the unloading plate 2 can be hoisted to realize the unloading of all products.

[0062] Preferably, the method is suitable for the superplastic forming process of titanium alloy components with specifications below 500 mm, and can achieve multi-piece forming in one furnace. Depending on the platform size of the superplastic forming equipment and the size of the product components, the number of mold cavities can be 2 or more, up to 10 or even more.

[0063] A specific embodiment is given below.

[0064] Example 1

[0065] In this embodiment, Fig. 9 As shown in the figure, the maximum outer diameter of the small-sized titanium alloy component is 213mm, the height is 154mm, the straight wall section is 30mm, and the cone section has 6 protrusions. Due to the relatively complex shape and structure of the product, only superplastic forming process can be used. Due to the existence of process structures such as flange edge and cutting margin in superplastic forming process, the straight wall section of the product after superplastic forming is 40mm, which is very difficult to be taken out of the furnace, and the product is easily deformed during the process. The following is the specific implementation process of the one-mold multi-cavity superplastic forming process.

[0066] Step 1: Design and manufacture a multi-cavity superplastic forming die, such as Figure 1 As shown. It includes an upper die cover, a stripper plate, a forming die, a base and a positioning pin. The forming die is located on the base and is clamped in the positioning groove of the base through a positioning column; the upper die cover, the stripper plate and the base are positioned through their positioning holes and positioning pins.

[0067] The assembly clearance between the discharge hole of the discharge plate and the discharge table of the forming mold is 2mm on one side, the clearance between the forming mold and the mold groove of the base is 2mm on one side, and the clearance between the positioning column and the mold positioning groove is 1mm on one side.

[0068] Fix the upper mold cover and the equipment fixing plate of the base of the assembled mold to the upper platform and lower platform of the superplastic equipment with bolts respectively. After installation, remove the positioning pins.

[0069] Step 2: Apply solder paste evenly on the inner cavity of the forming mold, the surface of the blank and the lower surface of the upper mold cover. Place the blank on the unloading plate and align its center with the center of the forming mold cavity.

[0070] Step 3: Connect the thermocouple, close the furnace door after entering the furnace, heat up the superplastic equipment at a rate of 50°C / h, and set the final forming temperature of the mold to 900°C. Keep warm for 1 hour, close the mold by moving the upper platform down, and execute the air intake procedure.

[0071] Step 4: After the product is molded, maintain the pressure for 10 minutes, stop the air intake, raise the upper platform, cool it down to 750℃ with the furnace, open the furnace door and take it out of the furnace.

[0072] Step 5: Install the air blowing and cooling device above the unloading plate. Each vertical air blowing pipe extends into the cavity of the forming mold and is connected to compressed air. While blowing and cooling, the unloading plate is slowly lifted to achieve rapid lifting and unloading of the product.

[0073] It is to be understood that the present invention is described by way of embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and embodiments that can fall within the scope of the claims of this application all fall within the scope protected by the present invention.

[0074] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A multi-cavity superplastic forming die for small-sized titanium alloy components, characterized in that: include: An upper die cover (1), a stripping plate (2), a forming die (3), a base (4) and a positioning pin (5); A plurality of mold grooves (44) are distributed in the middle of the base (4) for installing the forming mold (3), and a mold positioning groove (45) is provided in each mold groove (44); each forming mold (3) is designed to be a column structure, and a positioning column (32) is provided at the bottom end to match the mold positioning groove (45), and a discharge platform (33) is provided at the top, the outer diameter of which is smaller than the outer diameter of the forming mold (3), and the inside of which is provided with a mold cavity (35) for accommodating a blank to be formed, and an exhaust groove (31) is provided at the bottom. The center of the bottom of the cavity (35) has an exhaust hole extending through the exhaust groove (31); the middle position of the discharge plate (2) has a discharge hole (22) that is distributed in the same manner as the respective forming molds (3); the position on the upper mold cover (1) corresponding to the discharge hole (22) is an air cavity (14), the center of each air cavity is an air inlet hole (18), a sealing ring (12) is fixed around it, the center of the upper mold cover (1) is connected to an air inlet pipeline (16), and the air inlet pipeline (16) and the air inlet holes (18) are connected; Symmetrical positioning holes are arranged at the edges of the base (4), the stripping plate (2) and the upper die cover (1). After the upper die cover (1), the stripping plate (2), the respective forming dies (3) and the base (4) are assembled in sequence, they are connected and positioned using positioning pins (5) through the positioning holes on the respective components.

2. The multi-cavity superplastic forming die for small-sized titanium alloy components according to claim 1, characterized in that: The multi-cavity superplastic forming mold also has a set of cooperating air blowing and cooling tooling for assisting the removal of structural parts with straight wall features that are difficult to demold. The tooling includes an outer ring (61), an air pipe (62), a support rod (63), a hanging column (64) and an air inlet pipe (65). The air inlet pipe (65) is connected to the outer ring (61) and is arranged in a cross inside the outer ring (61). The air pipes (62) are connected at positions perpendicular to the plane where the outer ring (61) is located and corresponding to the air inlet holes (18). Compressed air is introduced through the air inlet pipe (65) and enters the cavity of the forming mold (3) through the air pipes (62), so that the product is quickly cooled and shrunk.

3. The multi-cavity superplastic forming die for small-sized titanium alloy components according to claim 1, characterized in that: Lifting columns are designed around the upper mold cover (1), the unloading plate (2), the forming mold (3) and the base (4) to facilitate the lifting of the formed structure out of the furnace; Equipment fixing plates are designed on both the upper mold cover (1) and the base (4) for respectively installing and fixing them in the superplastic equipment; Temperature measuring holes are evenly arranged around the upper mold cover (1) and the forming mold (3) to facilitate temperature measurement during the forming process.

4. The multi-cavity superplastic forming die for small-sized titanium alloy components according to claim 1, characterized in that: The materials used for the upper die cover (1), the unloading plate (2), the forming die (3) and the base (4) are Ni7N heat-resistant steel, and the materials used for the air intake pipeline (16) and the positioning pin (5) are stainless steel.

5. The multi-cavity superplastic forming die for small-sized titanium alloy components according to claim 2, characterized in that: The material used for the air blowing and cooling tooling is stainless steel.

6. The multi-cavity superplastic forming die for small-sized titanium alloy components according to claim 1, characterized in that: The assembly clearance between the discharge hole (22) of the discharge plate (2) and the discharge platform (33) of the forming mold (3) is 1 to 3 mm on one side, the clearance between the forming mold (3) and the mold groove (44) of the base (4) is 1 to 3 mm on one side, and the clearance between the positioning column (32) and the mold positioning groove (45) is 0.5 to 2 mm on one side; the height of the discharge plate (2) is 1 to 4 mm lower than the height of the discharge platform (33).

7. The multi-cavity superplastic forming die for small-sized titanium alloy components according to claim 1, characterized in that: The diameter of the sealing ring (12) is larger than the maximum diameter of the cavity (35) of the forming mold (3) but smaller than the maximum outer diameter of the unloading platform (33).

8. A forming method using a multi-cavity superplastic forming die for a small-sized titanium alloy component according to any one of claims 1 to 7, characterized in that: The steps include: Step 1: The upper mold cover (1) and the equipment fixing plate of the base (4) of the assembled forming mold are respectively fixed to the upper platform and the lower platform of the superplastic equipment with bolts. After installation, the positioning pin (5) is removed; Step 2: evenly apply solder stop on the inner cavity (35) of the forming mold (3), the surface of the blank and the lower surface of the upper mold cover (1), and place the blank on the top of the unloading plate (2) with its center aligned with the center of the forming mold cavity; Step 3: Connect the thermocouple, close the furnace door after entering the furnace, heat up the superplastic equipment at a rate of 40-60℃ / h, and the final forming temperature of the mold is 890-910℃. Keep warm for 1h, close the mold on the upper platform and lower it, and execute the air intake program; Step 4: After the product is molded, maintain the pressure for 5 to 15 minutes, stop the air intake, raise the upper platform, and cool down to 650 to 800°C with the furnace; Step 5: Lift the unloading plate (2) and lift the product out of the oven. For products with straight wall sections that are difficult to remove from the oven, install an air blowing and cooling device above the unloading plate. Each vertical air pipe (62) extends into the cavity of the forming mold and is connected to compressed air. While blowing and cooling, slowly lift the unloading plate to complete the lifting of the product out of the oven.

9. The forming method of a small-sized titanium alloy component using a multi-cavity superplastic forming die according to claim 8, characterized in that: During the furnace loading process in step 2, the blanks are placed independently above the discharge holes (22) corresponding to each forming mold (3). The maximum outer diameter of the blank is at least 10 mm larger than the diameter of the sealing ring (12), and the maximum cannot exceed the center lines of the two discharge holes. If the maximum outer diameter of the blank is smaller than the discharge hole, the blank is overlapped on the discharge plate (2) by welding ears.

10. The forming method of a small-sized titanium alloy component using a multi-cavity superplastic forming die according to claim 8, characterized in that: It is suitable for superplastic forming of titanium alloy components with specifications and dimensions below 500mm, and can realize the forming of multiple pieces in one furnace.

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