Superplastic forming and diffusion bonding rapid transfer die set

Abstract

The application provides a superplastic forming / diffusion bonding quick conversion die seat, and belongs to the technical field of plastic processing of metal materials. The quick conversion die seat is a movable heating furnace. The die is placed in the quick conversion die seat to realize small-tonnage die closing, pressurizing and high-temperature heating, and replaces the original heating mode of the superplastic forming equipment. The superplastic forming die and the blank preparation stage before entering the superplastic forming equipment, the die cooling and high-temperature part taking after the superplastic forming / diffusion bonding and the like can be transferred to the special forming equipment outside, and the preheating of the forming temperature is implemented in advance. The superplastic forming / diffusion bonding processing cycle is shortened, the production efficiency is improved, and the overall manufacturing cost of the high-temperature forming parts is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of plastic working of metal materials, and relates to a high-temperature plastic forming production line processing technology of light-weight difficult-to-machine materials, in particular to a rapid conversion die set for superplastic forming and diffusion bonding. BACKGROUND

[0002] With the increasing requirements of new-generation high-Mach flight speed aircrafts for light weight, high strength, high temperature resistance, fatigue resistance and the like, the application demand for light-weight high-efficiency heat-resistant integrated structures is increasing. Therefore, the application demand for high-strength materials such as titanium alloy, titanium-aluminum compound, titanium-based composite and high-temperature alloy is also increasing. Due to the limitation of physical properties of such materials, it is almost impossible to perform stamping plastic forming at room temperature, so the high-temperature environment becomes one of the key process conditions for forming, which brings great challenges to the production line processing mode.

[0003] The process principle of superplastic forming is to utilize the abnormal large elongation characteristics of materials under specific temperature, pressure and other external conditions, so as to process special shape profiles beyond the limit. At the same time, in the process of superplastic forming, the diffusion and solid-phase reaction between the interface atoms of the surfaces of the materials in contact with each other are realized under the action of high temperature and certain pressure, that is, diffusion bonding occurs, so that the superplastic forming / diffusion bonding combined process can be realized, and a hollow integrated structure with complex structure can be obtained. The process conditions of superplastic forming and superplastic forming / diffusion bonding are more stringent. Taking titanium alloy as an example, the processing temperature of superplastic forming / diffusion bonding of C4 material is preferably 890-920℃.

[0004] The typical production line process operation flow of superplastic forming / diffusion bonding is as follows: (1) preparation of raw materials and molds; (2) superplastic forming equipment out of the lower platform; (3) mold and raw material into the lower platform; (4) lower platform with mold into superplastic forming equipment; (5) connect gas path and vacuumize; (6) superplastic forming equipment platform warming up (argon gas is introduced into the mold when the temperature is about 300-500℃); (7) high-temperature (900-1100℃) superplastic forming / diffusion bonding processing; (8) superplastic forming equipment platform and mold cooling; (9) high-temperature (500-700℃) cutting protection gas path; (10) high-temperature out of the superplastic forming equipment lower platform together with the mold; (11) mold opening at high temperature (500-700℃) to take out the part and close the mold; (12) high-temperature re-entry into the superplastic forming equipment lower platform; (13) superplastic forming equipment platform and mold continue to cool to room temperature; (14) again out of the superplastic forming equipment lower platform; (15) mold unloading, completing the processing of a single part. The above-mentioned entire production flow can be repeated to process other parts.

[0005] The typical superplastic forming equipment is as follows: Figure 1 , 2, 3, as shown in the figure, is a movable superplastic forming machine with a track under the platform, wherein A is the equipment accessories, B is the overall outer frame, C is the hydraulic cylinder, D is the upper platform, E is the lower platform, F is the front furnace door, G is the outer frame, H is the guide rail, I is the side furnace door, J is the side outer frame, K is the control cabinet, L is the track, and M is the forming die. During processing, first place the forming die M in the center on the lower platform E at room temperature without clamping, then connect the gas circuit and start the overall heating and pressurization; after reaching the process temperature, carry out pressure processing, the temperature is about 900-1100℃; after completion, the die M cools with the platform, when the die M cools to about 500-700℃, the lower platform E is opened and the upper die of the die M is opened, the part blank is taken out, after completion, the die is restored and the lower platform E is reset to continue cooling with the furnace; until room temperature, the next set of dies are replaced. In the entire superplastic forming equipment, the furnace cavity 6 faces only the lower surface of the upper platform D and the upper surface of the lower platform E contain the heating system, the remaining four sides of the front furnace door F and the side furnace door I only contain a ceramic insulation layer and do not have a heating system, and the die M only relies on the upper and lower surfaces for heat conduction to warm up.

[0006] Considering the heating and cooling capacity of the superplastic forming equipment, the service life of the die M and other factors, the heating and cooling rate is generally 60-75℃ / h, so the heating time needs to last for 12-18 hours, the part forming process only takes about 1-3 hours, and the cooling time after forming is longer than the heating time by about 18-24 hours, resulting in a single part manufacturing cycle of about 36-72 hours, and the effective part processing production efficiency is extremely low. Looking at the entire superplastic manufacturing process, the die M heating / cooling process occupies the longest time of the superplastic forming equipment, the effective forming processing time accounts for less than 10%, a large amount of energy resources are wasted, and cannot be used for effective part forming manufacturing process.

[0007] With the rapid increase in the amount of high-temperature-resistant materials used in future aircraft, the number of parts that need to be formed by high-temperature plastic forming processes is gradually increasing, and increasing the number of equipment to meet the production line capacity demand is extremely costly, which cannot fundamentally solve the low efficiency of the equipment platform, and cannot realize batch continuous production scale effect, so a continuous and efficient high-temperature forming method is needed to achieve low-cost manufacturing. SUMMARY

[0008] In order to solve the above key technical problems, the application provides a rapid conversion die set for superplastic forming and diffusion bonding and a die changing processing method, which is a superplastic forming / diffusion bonding processing method based on innovative die transfer and replacement, uses multiple movable heating furnaces to replace the original superplastic forming equipment heating mode, and transfers all processes such as the superplastic forming mold and blank preparation stage before entering the superplastic forming equipment and mold cooling and high-temperature part taking after superplastic forming / diffusion bonding to outside the special forming equipment, and implements preheating at a forming temperature of 900-1100 DEG C, reduces the preparation process and the superplastic forming equipment time occupied by the preheating and mold cooling process, thereby shortens the superplastic forming / diffusion bonding processing cycle, improves the production efficiency, and further reduces the overall manufacturing cost of high-temperature forming parts.

[0009] In order to achieve the above object, the technical scheme adopted by the application is as follows:

[0010] The rapid conversion die set for superplastic forming and diffusion bonding is used in cooperation with the existing superplastic forming equipment, and is used for heating and small-tonnage die assembly and pressurization, and comprises an upper cover and a lower structure.

[0011] The lower structure comprises guide columns 11, a base 12 and lower ceramic bricks 13, the base 12 is a rectangular base, a base groove is arranged in the middle of the base 12, the lower ceramic bricks 13 are installed in the base groove, multiple slot-shaped through holes and slot-shaped blind holes are uniformly arranged on the bottom surface of the two side edges of the base 12 in the length direction, the slot-shaped through holes and the slot-shaped blind holes are coaxial and perpendicular, and a cross-shaped groove is formed; the lower ceramic bricks 13 are installed in the base groove and are fixed through long screws, small holes are arranged on the side surface of the lower ceramic bricks 13 near the upper surface, and the small holes are used for inserting heating thermocouples to realize heating; the guide columns 11 are fixed on the upper surface of the base 12 at the center positions of the two ends, and are used for ensuring the alignment of the base 12 and the upper cover.

[0012] The upper cover comprises an upper pressing plate 1, an upper ceramic tile 2, a left side wall 3, a left side ceramic tile 4, a right side wall 5, a right side ceramic tile 6, a front side wall 7, a front side ceramic tile 8, a rear side wall 9, a rear side ceramic tile 10, and a rotatable hydraulic rod 14. The upper pressing plate 1 is a rectangular plate with the same size as the base 12, which together with the left side wall 3, the right side wall 5, the front side wall 7 and the rear side wall 9 forms a hollow cover body. The inner sides of the upper pressing plate 1 and the four side walls are respectively fixed with the upper ceramic tile 2, the left side ceramic tile 4, the right side ceramic tile 6, the front side ceramic tile 8 and the rear side ceramic tile 10. Each ceramic tile is provided with a plurality of small holes on the side surface for inserting a heating thermocouple to achieve heating. The small holes are close to the surface facing the inner side of the upper cover. The outer sides of the left side wall 3 and the right side wall 5 are provided with protruding ear hole for cooperating with the guide column 11 on the base 12. The upper cover covers the lower structure, and the ceramic tiles on the inner sides of the two form an internal space for placing a forming mold M and forming a hexahedral heating mode. The height of the internal space is less than the height of the forming mold M after clamping to achieve a pressurizing effect. A gap is left between the upper cover and the lower structure after clamping for the air pipe to pass through the connection with the forming mold M to achieve the air passage of the mold M. The rotatable hydraulic rod 14 is a hydraulic telescopic rod, the upper end of which is fixed on the upper pressing plate 1. A plurality of rotatable hydraulic rods 14 are evenly distributed on the two side edges of the upper pressing plate 1 in the length direction. The lower end of the rotatable hydraulic rod 14 cooperates with the cross-shaped slot on the base 12, and the rotatable hydraulic rod 14 is coaxial with the cross-shaped slot to achieve small tonnage clamping and pressurizing of the upper cover and the lower structure.

[0013] Further, the rotatable hydraulic rod 14 comprises a spherical base 141, a cylinder body 142, a telescopic rod 143, a shape joint 144 and a fixed seat 145. The cylinder body 142 and the telescopic rod 143 are integral parts with a contraction pressure maintaining function. The telescopic rod 143 is deep into the cylinder body 142. The telescopic rod 143 has a self-rotation function of 90°. The cylinder body 142 is movably connected with the spherical base 141 on the upper end through a spherical surface, so that the rotatable hydraulic rod 14 can adapt to a certain degree of angular load. The spherical base 141 is fixed on the upper pressing plate 1. The shape joint 144 is a strip-shaped block structure, which is connected with the lower end of the telescopic rod 143 through a thread, and is used for cooperating with the cross-shaped slot on the base 12. The shape joint 144 first passes through the slot-shaped through hole in the cross-shaped slot from the upper side, and then rotates 90° with the telescopic rod 143 to be clamped into the slot-shaped blind hole to realize the locking. The fixed seat 145 is arranged on the outer wall of the cylinder body 142, and is used for connecting the rotatable hydraulic rod 14 with the front side wall 7 or the rear side wall 9.

[0014] Further, the base 12, the upper pressing plate 1, the left side wall 3, the right side wall 5, the front side wall 7 and the rear side wall 9 are evenly distributed with internal pipe slots which are communicated. The openings at both ends of each internal pipe slot, i.e. the pipe slot ports 15 are used for connecting the circulating cooling water to avoid the temperature inside from being transferred to the outer wall to realize the rapid conversion of the mold base for normal temperature handling and transfer.

[0015] The quick conversion die holder is assembled as shown in the figure Figure 12 The forming die M is placed in the interior of the quick conversion die holder, and the six-surface heating and pressurizing function of the quick conversion die holder greatly improves the heating efficiency of the original superplastic forming equipment, shortens the heating time, and improves the overall production efficiency. Therefore, multiple steps in the process can be implemented outside the superplastic forming equipment, without occupying the equipment.

[0016] Further, the quick conversion die holder can be used in cooperation with a simple press equipment.

[0017] The effects and benefits of the present application are as follows:

[0018] By using the present application, the superplastic forming / diffusion bonding overall production process is shortened. The integral movable heating furnace (quick conversion die holder) with self-heating function is used to replace the original large superplastic forming equipment for heating, and the six-surface heating mode greatly improves the heating efficiency, which can effectively shorten the heating period. The quick conversion die holder is used to preheat all the dies, which directly saves the time for heating the dies in the equipment. The integral lifting and moving function avoids the preparation of the raw material tooling and the debugging of the gas connection link, and comprehensively realizes the quick replacement of the superplastic forming die and the overall improvement of the production efficiency. For the same equipment, the heating and heat preservation functions are simplified, multiple quick conversion die holders are equipped, and multiple dies are prepared, heated, and connected with the gas connection for debugging. In this way, multiple forming dies can be quickly replaced in a high-temperature state, the equipment can be continuously produced, and the energy consumption of single production is reduced. After continuous batch processing, the manufacturing cost of single parts is also greatly reduced, which has strong popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Fig. 1 is a schematic diagram of the overall structure of a superplastic forming equipment;

[0020] Figure 2 Fig. 4 is a schematic diagram of the opening of the front furnace door of the superplastic forming equipment;

[0021] Figure 3 Fig. 5 is a front view of the opening of the front furnace door of the superplastic forming equipment;

[0022] Figure 4 Fig. 6 is a schematic diagram of the structure of a quick conversion die holder;

[0023] Figure 5 Fig. 7 is a schematic diagram of the upper cover structure of the quick conversion die holder;

[0024] Figure 6 Fig. 8 is a schematic diagram of the internal structure of the upper cover of the quick conversion die holder;

[0025] Figure 7 Fig. 9 is a schematic diagram of the lower structure of the quick conversion die holder;

[0026] Figure 8 : Preloading diagram of forming die M;

[0027] Figure 9 : Assembly diagram of quick conversion die seat;

[0028] Figure 10 : Locking diagram of rotatable hydraulic rod;

[0029] Figure 11 : Structure diagram of rotatable hydraulic rod;

[0030] Figure 12 : Assembly diagram of quick conversion die seat;

[0031] Figure 13 : Quick conversion die seat in superplastic forming equipment rotation installation diagram;

[0032] Figure 14 : Quick conversion die seat in simple press equipment diagram;

[0033] In the figure: 1 upper pressing plate; 2 upper ceramic tile; 3 left side wall; 4 left side ceramic tile; 5 right side wall; 6 right side ceramic tile; 7 front side wall; 8 front side ceramic tile; 9 rear side wall; 10 rear side ceramic tile; 11 guide column; 12 base; 13 lower ceramic tile; 14 rotatable hydraulic rod; 15 pipe groove port; 141 spherical base; 142 cylinder; 143 telescopic rod; 144 shape joint; 145 fixed seat; A equipment accessories; B overall outer frame; C hydraulic cylinder; D upper platform; E lower platform; F front furnace door; G outer frame; H guide rail; I side furnace door; J side outer frame; K control cabinet; L track; M forming die. DETAILED DESCRIPTION

[0034] The technical solutions of the present application will be described below clearly and completely. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments improved or adjusted by those skilled in the art belong to the protection scope of the present application.

[0035] A quick conversion die seat for superplastic forming and diffusion bonding, which is used in combination with existing superplastic forming equipment to realize heating and small-tonnage die assembly pressurization, comprises an upper cover and a lower structure, as shown in Figure 4 .

[0036] As shown in Figure 7 , the lower structure comprises a guide column 11, a base 12 and a lower ceramic tile 13. The base 12 is a rectangular base, and a base groove is arranged in the middle part for mounting a lower ceramic tile 13. Three slot-shaped through holes and slot-shaped blind holes are uniformly arranged on the bottom surface of the lengthwise two side edges of the base 12, and the slot-shaped through holes and the slot-shaped blind holes are coaxial and perpendicular, forming a cross-shaped slot, as shown inFigure 10 The lower ceramic tiles 13 are arranged in two rows, each row having four tiles, and are fixed in the base groove by long screws. The side surface of the lower ceramic tiles 13 near the upper surface is provided with a plurality of small holes for inserting heating thermocouples.

[0037] As shown in Figure 5 and Figure 6 The upper cover includes an upper pressing plate 1, upper ceramic tiles 2, a left side wall 3, left side ceramic tiles 4, a right side wall 5, right side ceramic tiles 6, a front side wall 7, front side ceramic tiles 8, a rear side wall 9, rear side ceramic tiles 10, and rotatable hydraulic rods 14. The upper pressing plate 1 is a rectangular plate with the same size as the base 12, which, together with the left side wall 3, the right side wall 5, the front side wall 7, and the rear side wall 9, forms a hollow cover body. Eight upper ceramic tiles 2 are fixed on the bottom surface of the upper pressing plate 1 by screws after being assembled. The upper ceramic tiles 2 have the same assembly method as the lower ceramic tiles 13. Four left side ceramic tiles 4 and four right side ceramic tiles 6 are respectively arranged in two rows, each row having two tiles, and are fixed on the inner side surfaces of the left side wall 3 and the right side wall 5 by screws after being assembled. Three front side ceramic tiles 8 and three rear side ceramic tiles 10 are respectively arranged in two rows and are fixed on the inner side surfaces of the front side wall 7 and the rear side wall 9 by screws after being assembled. The side surfaces of each ceramic tile are provided with a plurality of small holes for inserting heating thermocouples. The small holes are close to the surface facing the inner side of the cover. The left side wall 3 and the right side wall 5 are provided with protruding ear hole on the outer side for cooperating with the guide column 11 on the base 12. The upper cover is placed on the lower structure, and the ceramic tiles on the inner sides of the two form an internal space for placing a forming mold M and forming a hexahedral heating mode. The height of the internal space is less than the height of the forming mold M after clamping to achieve a pressing effect. A gap is left between the upper cover and the lower structure after clamping for the air pipe to pass through and connect with the forming mold M to achieve air ventilation of the mold M. The rotatable hydraulic rods 14 are hydraulic telescopic rods, the upper ends of which are fixed on the upper pressing plate 1. Six rotatable hydraulic rods 14 are uniformly distributed on the two side edges of the upper pressing plate 1 in the length direction. The lower ends of the rotatable hydraulic rods 14 cooperate with the cross-shaped groove on the base 12, and the rotatable hydraulic rods 14 are coaxial with the cross-shaped groove, which is used to realize small tonnage clamping and pressing of the upper cover and the lower structure.

[0038] As shown in Figure 11As shown, the rotatable hydraulic rod 14 includes a spherical base 141, a cylinder 142, an extension rod 143, a shape joint 144 and a fixing base 145. The cylinder 142 and the extension rod 143 are integral pieces with a contraction pressure maintaining function. The extension rod 143 is below and deep into the cylinder 142, and the extension rod 143 has a self-rotation 90° function. The upper end of the cylinder 142 is movably connected with the spherical base 141 through a spherical surface, so that the rotatable hydraulic rod 14 can adapt to a certain degree of angular offloading. The spherical base 141 is fixed on the upper pressing plate 1. The shape joint 144 is a strip block structure, which is threadedly connected at the lower end of the extension rod 143, and is used for cooperating with the cross slot on the base 12. The shape joint 144 first passes through the slot-shaped through hole in the cross slot from above, and then rotates 90° with the extension rod 143 to be clamped into the slot-shaped blind hole to realize the lock catch. The fixing base 145 is arranged on the outer wall of the cylinder 142, and is used for connecting the rotatable hydraulic rod 14 with the front side wall 7 or the rear side wall 9.

[0039] The base 12, the upper pressing plate 1, the left side wall 3, the right side wall 5, the front side wall 7 and the rear side wall 9 are uniformly provided with internal pipe grooves in communication. The openings at both ends of each internal pipe groove, i.e. the pipe groove ports 15, are used for connecting the circulating cooling water, so as to avoid the temperature inside from being transferred to the outer wall, thereby realizing the rapid conversion of the mold base.

[0040] The above rapid conversion mold base is matched with a superplastic forming device, wherein the superplastic forming device is only used for large-tonnage supplementary die closing pressurization when high gas pressure forming is performed. The use process is as follows:

[0041] 1. Production preparation is performed. The surface of the forming die M is cleaned and coated with a stop welding agent. The pipeline is connected and air tightness test is performed. The raw material is prepared and coated with a stop welding agent.

[0042] 2. The raw material is placed in the forming die M in a room temperature state. The die itself is aligned and assembled by the guide column. The die closing state is reached.

[0043] 3. The rapid conversion mold base is assembled in a room temperature state. The upper cover is vertically moved upward as a whole by using a crane. The rapid conversion mold base is opened. The lower structure is exposed, as shown in Figure 7 The upper surface of the lower ceramic brick 13 is cleaned of sundries. The forming die M prepared for loading is placed on the lower ceramic brick 13 as a whole by using a crane, as shown in Figure 8 The upper cover is vertically lowered and installed by using a crane in a room temperature state, as shown in Figure 9As shown, using guide pillar 11 to align with the base 12 folding assembly, the lower end of the swivel hydraulic rod 14 type joint 144 exposed through the cross-shaped slot-shaped through hole on the base 12, the telescopic rod 143 rotated 90° to make the type joint 144 align with the cross-shaped slot-shaped blind hole, and then drive the swivel hydraulic rod 14 to retract, so that the type joint 144 is clamped into the slot-shaped blind hole, thereby realizing the sealing and pressurization of the quick change die set to the internal forming die M, as shown in Figure 12

[0044] 4. The venting pipeline of the forming die passes through the gap of the quick change die set, and the forming die M is vacuumed through the venting pipeline to achieve a negative pressure state and replace the air inside the forming die M. After the swivel hydraulic rod 14 forms a stable mold closing pressure, circulating cooling water is introduced into the internal pipe groove on each wall surface of the quick change die set, and the quick change die set starts to heat up, with a target temperature of 900-1100°C.

[0045] 5. When the temperature of the forming die M reaches 300-500°C, protective argon gas is introduced into the forming die M, with a pressure of 0.11-0.12 MPa. Continue to heat up until the forming die M reaches the forming temperature of 900-1100°C.

[0046] 6. Use a forklift or crane to transfer the quick change die set with the forming die M to the lower platform E of the superplastic forming equipment and place it in the center. Move the lower platform E along the track L back to the working position, keep the heating temperature and circulating cooling water of the quick change die set, and move the upper platform D downward to apply pressure to the upper cover of the quick change die set. When the downward pressure is greater than the total pressure of the swivel hydraulic rod 14, remove the retraction pressure of the swivel hydraulic rod 14, and the sealing pressure of the forming die M is changed to be controlled by the superplastic forming equipment as a whole.

[0047] 7. Set the upper platform D downward pressure of the superplastic forming equipment in linkage control with the forming gas pressure in the blank, and always keep the remaining sealing pressure at 10-20 tons. Release the outlet of the forming die M gas path to allow exhaust, and start superplastic forming / diffusion bonding. After the venting, pressure holding, and pressure reducing cycles, the blank forming process is completed, and the forming die M gas path is again protected by the pressure, with a pressure of 0.11-0.12 MPa.

[0048] 8. Restore the use of the swivel hydraulic rod 14 to apply sealing mold closing pressure to the forming die M, gradually remove the mold closing pressure of the upper platform D of the superplastic forming equipment downward, and change to high-temperature sealing by the quick change die set itself. The forming die M in the quick change die set continues to maintain the gas path protective pressure. Open the upper platform D of the superplastic forming equipment and move the lower platform E. At this time, other quick change die sets that have completed steps 1 to 5 can be placed on the lower platform E to perform steps 6 to 8, realize continuous operation of the superplastic forming equipment, and improve equipment utilization efficiency, as shown in Figure 13 ​shown.

[0049] 9. The forming die M is cooled down outside the superplastic forming equipment with furnace; when the temperature is reduced to 500-700℃, the protection gas pressure of the forming die M is stopped, the pressure of the rotatable hydraulic rod 14 of the quick change die set is released, the upper cover is opened by using a forklift or a crane, the upper die of the forming die M is opened, the formed part rough material is taken out to other position for cooling, and after the forming die M and the quick change die set are cooled to room temperature, the rough material replacement or the die replacement can be performed.

[0050] In other embodiments, the superplastic forming equipment is replaced by a simple press equipment, such as a common hydraulic press, such as Figure 14 shown.

Claims

1. A rapid transfer die set for superplastic forming and diffusion bonding, comprising: The quick conversion die holder is used in combination with existing superplastic forming equipment to realize heating and small tonnage die closing and pressurizing, and comprises an upper cover and a lower structure; The lower structure comprises a base (12) and a lower ceramic brick (13), the base (12) is a rectangular base, a base groove is arranged in the middle of the base (12) for mounting the lower ceramic brick (13), a plurality of groove-shaped through holes and groove-shaped blind holes are uniformly arranged on the bottom surface of the two side edges of the base (12) in the length direction, the groove-shaped through holes and the groove-shaped blind holes are coaxial and perpendicular, and a cross slot is formed; the lower ceramic brick (13) is mounted in the base groove and fixed, a plurality of small holes are arranged on the side surface near the upper surface of the lower ceramic brick (13) for inserting a heating thermocouple to realize heating. The upper cover comprises an upper pressing plate (1), an upper ceramic brick (2), a left side wall (3), a left side ceramic brick (4), a right side wall (5), a right side ceramic brick (6), a front side wall (7), a front side ceramic brick (8), a rear side wall (9), a rear side ceramic brick (10) and a rotatable hydraulic rod (14); the upper pressing plate (1) is a rectangular plate with the same size as the base (12), which surrounds a hollow cover body together with the left side wall (3), the right side wall (5), the front side wall (7) and the rear side wall (9), and the inner sides of the upper pressing plate (1) and the four side walls are respectively fixed with the upper ceramic brick (2), the left side ceramic brick (4), the right side ceramic brick (6), the front side ceramic brick (8) and the rear side ceramic brick (10), and a plurality of small holes are arranged on the side surface of each ceramic brick for inserting a heating thermocouple to realize heating, and the small holes are close to the surface facing the inner side of the upper cover; the upper cover covers the lower structure, and the internal space surrounded by the ceramic bricks on the inner sides of the two is used for placing a forming die (M); the rotatable hydraulic rod (14) is a hydraulic telescopic rod, the upper end of which is fixed on the upper pressing plate (1), a plurality of rotatable hydraulic rods (14) are uniformly distributed on the two side edges of the upper pressing plate (1) in the length direction, the lower end of each rotatable hydraulic rod (14) is matched with the cross slot on the base (12), and the rotatable hydraulic rod (14) is coaxial with the cross slot, which is used for realizing small tonnage die closing and pressurizing of the upper cover and the lower structure. The quick conversion die holder is provided with a forming die (M) inside, which is heated and pressurized and combined with a simple press machine to realize superplastic forming / diffusion bonding processing.

2. A rapid transfer die set for superplastic forming and diffusion bonding according to claim 1, wherein The base (12) is provided with guide columns (11) at the center positions of the two end surfaces, and the left side wall (3) and the right side wall (5) are provided with protruding ear hole on the outer side, the guide columns (11) are matched with the ear hole, and the base (12) is aligned with the upper cover.

3. The rapid transfer die set for superplastic forming and diffusion bonding of claim 1, wherein, The height of the internal space surrounded by the upper cover and the lower structure is less than the height of the forming die (M) after die closing.

4. The rapid transfer die set for superplastic forming and diffusion bonding of claim 1, wherein, After the upper cover and the lower structure are combined, a gap is left between the two, which is used for a ventilation pipeline to pass through and be connected with the forming die (M) to realize ventilation of the forming die (M).

5. The rapid transfer die set for superplastic forming and diffusion bonding of claim 1, wherein, The base (12), the upper pressing plate (1), the left side wall (3), the right side wall (5), the front side wall (7) and the rear side wall (9) are uniformly provided with internal pipe grooves, and the openings at the two ends of each internal pipe groove, i.e. the pipe groove ports (15) are used for connecting circulating cooling water to realize normal temperature handling and transfer of the quick conversion die holder.

6. The rapid transfer die set for superplastic forming and diffusion bonding of claim 1, wherein, The rotatable hydraulic rod (14) comprises a cylinder (142), a telescopic rod (143) and a shape joint (144), the cylinder (142) and the telescopic rod (143) are integral, have a contraction pressure maintaining function, the telescopic rod (143) is below and deep into the cylinder (142), the telescopic rod (143) has a self-rotation 90° function, and the upper end of the cylinder (142) is fixed on the upper pressing plate (1); the shape joint (144) is a strip block structure, is connected to the lower end of the telescopic rod (143) through a thread, is used for cooperating with a cross slot on the base (12), the shape joint (144) is firstly passed through a slot-shaped through hole in the cross slot from above, then is rotated 90° along with the telescopic rod (143), is clamped into a slot-shaped blind hole to realize a lock catch.

7. A rapid transfer die set for superplastic forming and diffusion bonding according to claim 6, wherein In the rotatable hydraulic rod (14), the upper end of the cylinder (142) is movably connected with a spherical base (141) through a spherical surface, so that the rotatable hydraulic rod (14) can adapt to a certain degree of angular load, and the spherical base (141) is fixed on the upper pressing plate (1).

8. A rapid transfer die set for superplastic forming and diffusion bonding according to claim 6 or 7, characterised in that, The outer wall of the cylinder (142) is provided with a fixing seat (145) for connecting the rotatable hydraulic rod (14) with the front side wall (7) or the rear side wall (9).

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