Vacuum vertical pressurization shape righting furnace and casting shape righting method

Abstract

The invention relates to the technical field of casting shape righting, in particular to a vacuum vertical pressurizing shape righting furnace and a casting shape righting method. The shape righting furnace comprises a mounting seat arranged in a pit, and further comprises a vacuum heating furnace arranged on the mounting seat, and a furnace pipe is arranged in the vacuum heating furnace; the shape righting die comprises an upper die and a lower die and is arranged in the furnace pipe; the upper ends of the supporting rod assemblies extend into the furnace pipe; the movable tray is placed at the top ends of the supporting rod assemblies and used for placing a lower die; the hydraulic machine comprises guide columns arranged on the two sides of the vacuum heating furnace, an upper beam body erected on the tops of the guide columns, a main oil cylinder installed in the middle of the upper beam body and a movable beam arranged below the upper beam body. The lower end of the guide column is fixed on the mounting seat, the movable beam is in sliding fit with the guide column, and a telescopic rod of the main oil cylinder is connected with the movable beam; the upper pressing block is placed on the top surface of the upper die; the upper end of the pressing rod assembly is connected with the movable beam, and the lower end of the pressing rod assembly sequentially penetrates through the vacuum heating furnace and the furnace pipe and then abuts against the upper pressing block.

Description

Technical Field

[0001] The present invention relates to the technical field of casting orthopedics, and particularly to a vacuum vertical pressurized orthopedic furnace and a casting orthopedic method, which are used for thermally orthopedic titanium alloy and superalloy precision castings. Background Art

[0002] For complex and precision castings of titanium alloy and superalloy, due to their relatively complex structures and shapes, certain deformations often occur in the structural shapes after casting. In order to eliminate the structural deformation without affecting the practical performance of the castings, the commonly used method at present is as follows: A standard heat-resistant steel orthopedic mold is made according to the shape of the casting, which consists of an upper mold and a lower mold. The side with deformation or the side with a larger deformation amount of the casting is placed upward in the lower mold, and then the upper mold is closed. A certain weight of counterweight is placed on the upper end face of the upper mold. Finally, the entire assembly (upper mold + lower mold + casting + counterweight) is placed in a vacuum heat treatment furnace, heated to the annealing temperature, and kept warm for a long time. The casting is pressed tightly by the gravity of the counterweight and the upper mold, so that the casting eliminates deformation at high temperature. As shown in Figure 1 shown, in Figure 1 A represents the counterweight.

[0003] Using Figure 1 the vacuum heat treatment furnace in

[0004] for heat treatment has the following problems:

[0005] (1) It is necessary to heat the mold, casting, and counterweight together to the annealing temperature, resulting in huge power consumption.

[0006] (2) The process is complex: The loading and unloading processes are cumbersome, and the labor intensity is high.

[0007] (3) Poor controllability: The pressure of the counterweight is not adjustable and cannot be applied to the orthopedics of castings of different sizes. Summary of the Invention

[0008] The main object of the present invention is to propose a vacuum vertical pressurized orthopedic furnace and a casting orthopedic method, aiming to solve the above technical problems.

[0009] To achieve the above object, on the one hand, the present invention proposes a vacuum vertical pressurized orthopedic furnace, which includes a mounting base arranged in a pit, and further includes:

[0010] A vacuum heating furnace, arranged on the mounting base, and a furnace liner is arranged inside it;

[0011] An orthopedic mold, including an upper mold and a lower mold, is arranged in the furnace liner and is used for fixing the casting;

[0012] A plurality of support rod assemblies, the upper ends of the support rod assemblies extending into the furnace liner;

[0013] A movable material tray, placed at the tops of the plurality of support rod assemblies for placing the lower mold;

[0014] A hydraulic press, including guide columns arranged on both sides of the vacuum heating furnace, an upper beam body erected on the tops of the guide columns, a main oil cylinder installed in the middle of the upper beam body, and a movable beam arranged below the upper beam body; the lower ends of the guide columns are fixed on the mounting seat, the movable beam is slidably matched with the guide columns, and the telescopic rod of the main oil cylinder is connected to the movable beam;

[0015] An upper pressing block, placed on the top surface of the upper mold;

[0016] A pressure rod assembly, its upper end connected to the movable beam, and its lower end passing through the vacuum heating furnace and the furnace liner in sequence and abutting against the upper pressing block.

[0017] Preferably, the pressure rod assembly is a water-cooled pressure rod assembly with cooling water flowing through its interior.

[0018] Preferably, a connecting rod is welded on the bottom surface of the movable beam, and a first connecting plate is installed at the lower end of the connecting rod by screws; the pressure rod assembly includes an upper rod body and a lower rod body; the lower rod body is installed at the lower end of the upper rod body by a detachable structure, and the lower rod body is coaxially arranged with the upper rod body; a graphite pressing head is arranged at the lower end of the lower rod body; a flange ring is welded on the outer peripheral surface of the top of the upper rod body; the flange ring is bolted to the first connecting plate.

[0019] Preferably, an annular groove is arranged on the outer peripheral surface of the upper rod body; a sleeve is sleeved on the outer peripheral surface of the upper rod body, and the sleeve and the annular groove of the upper rod body jointly form a cooling water accommodating cavity; a water inlet joint and a water outlet joint are arranged on the upper part of the upper rod body; a main water inlet pipe is opened in the center of the upper rod body, the lower part of the main water inlet pipe is communicated with the cooling water accommodating cavity, and the upper part is communicated with the water inlet joint; a water outlet pipe is opened in the upper part of the upper rod body, the lower part of the water outlet pipe is communicated with the cooling water accommodating cavity, and the middle part is communicated with the water outlet joint.

[0020] Preferably, the upper and lower ends of the sleeve are respectively formed with circumferential welds with the upper rod body by full welding; the main water inlet pipe and the water outlet pipe are both vertical blind hole structures; the water inlet joint is communicated with the main water inlet pipe through a first transverse hole; the lower part of the main water inlet pipe is communicated with the cooling water accommodating cavity through a second transverse hole; the water outlet joint is communicated with the water outlet pipe through a third transverse hole; the lower part of the water outlet pipe is communicated with the cooling water accommodating cavity through a fourth transverse hole; a first plug is arranged at the mouth of the main water inlet pipe; a second plug is arranged at the mouth of the water outlet pipe; the top surfaces of the first plug and the second plug both abut against the bottom surface of the first connecting plate of the connecting plate.

[0021] Preferably, a seal seat installation pipe is arranged on the vacuum heating furnace, and a flange plate is welded on the top of the seal seat installation pipe; a seal seat is installed on the flange plate; the assembly formed by the upper rod body and the sleeve is slidably matched with the seal seat; a sealing ring is arranged between the seal seat and the sleeve.

[0022] Preferably, the seal seat includes a seat pipe, an upper flange edge welded on the upper part of the seat pipe, and a lower flange edge welded on the lower part of the seat pipe; ribs are jointly welded between the upper flange edge, the seat pipe and the lower flange edge; the outer peripheral surface of the sleeve is slidably matched with the inner hole of the seat pipe; the sealing ring includes an upper sealing ring and a lower sealing ring, and the upper sealing ring and the lower sealing ring are respectively installed in the annular grooves at the upper and lower parts of the central hole of the seat pipe; the upper flange edge is installed with an upper seal pressing cover through bolt connection for pressing the upper sealing ring; the lower flange edge is installed with a lower seal pressing cover through screws for pressing the lower sealing ring.

[0023] Preferably, the detachable structure includes a second connecting plate and a clamping pipe; the second connecting plate is installed on the lower end surface of the upper rod body through screws; an annular protrusion is integrally formed on the outer peripheral surface of the top end of the lower rod body; the clamping pipe is sleeved on the lower rod body, and the annular protrusion is stuck on the clamping edge at the lower part of the clamping pipe; the flange edge at the upper part of the clamping pipe is bolt-connected with the second connecting plate; a plurality of cushion plates are arranged between the top end of the lower rod body and the second connecting plate.

[0024] Preferably, the vacuum vertical pressure straightening furnace further includes a vacuum machine installed in a pit, and the vacuum machine is connected with the vacuum heating furnace for evacuating the vacuum heating furnace; the vacuum heating furnace includes a furnace door, and casters are arranged at the bottom of the furnace door; the number of the guide columns is four, and guide sleeves are respectively installed at the four corner positions of the movable beam for slidably matching with the guide columns.

[0025] On the other hand, the present invention also provides a casting straightening method, using the above-mentioned vacuum vertical pressure straightening furnace, including the following steps:

[0026] S1. Forklift the movable material tray out of the vacuum heating furnace and transfer it outside the furnace;

[0027] S2. Place the lower die of the orthopedic mold on the movable material tray, then place the casting to be orthopedically treated on the lower die, and buckle the upper die on the casting; place an upper pressing block on the top of the upper die;

[0028] S3. Use a forklift to lift the movable material tray with the orthopedic mold, casting, and upper pressing block and send it into the vacuum heating furnace, so that the movable material tray is placed on the support rod assembly;

[0029] S4. Evacuate the vacuum heating furnace, heat it to the annealing temperature of the casting, and keep it warm; at the same time, use a hydraulic press to drive the pressure rod assembly and press tightly on the upper pressing block, so that the upper die applies pressure for orthopedic treatment to the casting; the hydraulic press applies a set pressure and keeps the pressure until the deformation is eliminated;

[0030] S6. After cooling, use a forklift to lift the movable material tray with the orthopedic mold, casting, and upper pressing block and transfer it outside the furnace, take out the casting, and complete the orthopedic treatment.

[0031] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0032] (1) The present invention adopts a structure combining a hydraulic press and a vacuum heating furnace. Since the pressure of the hydraulic press is adjustable, it can flexibly adjust the pressure according to the specific deformation conditions of the casting, improving the controllability and adaptability of orthopedic treatment. It overcomes the problem in the prior art that the pressure of the counterweight block is not adjustable and cannot be applied to the orthopedic treatment of castings of different sizes.

[0033] (2) In the vacuum vertical pressure orthopedic furnace and the casting orthopedic method provided by the present invention, since the counterweight block is cancelled and the pressure is applied by using a hydraulic press, no additional counterweight block is required, significantly reducing the components to be heated, thereby greatly reducing the energy consumption. In addition, the method of applying pressure by using a hydraulic press greatly improves the orthopedic efficiency.

[0034] (3) In the present invention, due to the setting of the movable material tray, the orthopedic mold, casting, and upper pressing block are installed outside the furnace, and the forklift is used for loading and unloading, greatly reducing the labor intensity. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0036] Figure 1Schematic diagram of orthopedic treatment using counterweights in the prior art;

[0037] Figure 2 Schematic diagram of the vacuum vertical pressure orthopedic furnace provided by the present invention;

[0038] Figure 3 Internal structure schematic diagram when the furnace door of the vacuum heating furnace in the present invention is in the open state;

[0039] Figure 4 Schematic diagram of the structure of the pressure rod assembly in the present invention.

[0040] Explanation of the reference numerals in the drawings: 1, vacuum machine; 2, vacuum heating furnace; 3, hydraulic press; 3a, upper beam body; 3b, guide column; 3c, movable beam; 3d, main oil cylinder; 4, pressure rod assembly; 401, upper rod body; 401a, main water inlet pipe; 401b, water outlet pipe; 401c, first transverse hole; 401d, second transverse hole; 401e, third transverse hole; 401f, fourth transverse hole; 402, lower rod body; 402a, annular protrusion; 403, flange ring; 404, sleeve; 405, cooling water accommodation cavity; 406, water inlet joint; 407, water outlet joint; 408, first plug; 409, second plug; 410, graphite pressing head; 5, connecting rod; 6, furnace door; 7, furnace liner; 8, upper pressing block; 9, upper pressing head assembly; 10, upper mold; 11, casting; 12, lower mold; 13, movable material tray; 14, support rod assembly; 14a, support rod body; 14b, graphite support head; 14c, support ring; 15, mounting seat; 16, first connecting plate; 17, sealing seat installation pipe; 18, flange plate; 19, sealing seat; 19a, seat pipe; 19b, lower flange edge; 19c, upper flange edge; 19d, rib plate; 20, upper sealing ring; 21, lower sealing ring; 22, upper sealing pressing cover; 23, lower sealing pressing cover; 24, second connecting plate; 25, limiting column. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0042] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0043] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] Combined with Figures 2 to 4 As shown, on the one hand, the present embodiment provides a vacuum vertical pressure straightening furnace, which includes a mounting base 15 arranged in a pit, and further includes:

[0045] A vacuum heating furnace 2, arranged on the mounting base 15, and a furnace liner 7 is arranged inside it;

[0046] A straightening die, including an upper die 10 and a lower die 12, is arranged in the furnace liner 7 and is used for fixing a casting 11;

[0047] A plurality of support rod assemblies 14, the upper ends of the support rod assemblies 14 extend into the furnace liner 7;

[0048] A movable material tray 13 is placed on the tops of the plurality of support rod assemblies 14 and is used for placing the lower die 12;

[0049] A hydraulic press 3, including guide columns 3b arranged on both sides of the vacuum heating furnace 2, an upper beam body 3a erected on the tops of the guide columns 3b, a main oil cylinder 3d installed in the middle of the upper beam body 3a, and a movable beam 3c arranged below the upper beam body 3a; the lower ends of the guide columns 3b are fixed on the mounting base 15, the movable beam 3c is slidably matched with the guide columns 3b, and the telescopic rod of the main oil cylinder 3d is connected to the movable beam 3c;

[0050] An upper pressing block 8 is placed on the top surface of the upper die 10;

[0051] A plurality of pressure rod assemblies 4, their upper ends are connected to the movable beam 3c, and their lower ends sequentially pass through the vacuum heating furnace 2 and the furnace liner 7 and then abut against the upper pressing block 8.

[0052] In this embodiment, the guide columns 3b are made of alloy steel with chromium plating on the surface to increase the surface strength, corrosion resistance and wear resistance. The number of the guide columns 3b is four, and guide sleeves are respectively installed at the four corner positions of the movable beam 3c for sliding cooperation with the guide columns 3b.

[0053] Combined with Figure 3As described above, the support rod assembly 14 includes a support rod body 14a, a graphite support head 14b provided at the top of the support rod body 14a, and a support ring 14c sleeved on the support rod body 14a. The bottom end of the support rod body 14a is fixedly connected to the mounting seat 15, and the support ring 14c is used to support the bottom of the vacuum heating furnace 2; the graphite support head 14b is used to support the bottom surface of the movable material tray 13, and the graphite support head 14b has good high-temperature and pressure resistance performance. Limit posts 25 are provided on the bottom surface of the movable material tray 13, and the plurality of limit posts 25 surround the graphite support head 14b, and the limit posts 25 are used to play a limiting role to prevent the movable material tray 13 from sliding.

[0054] Combined with Figure 4 As shown, a connecting rod 5 is welded to the bottom surface of the movable beam 3c, and a first connecting plate 16 is installed at the lower end of the connecting rod 5 by screws; the pressing rod assembly 4 includes an upper rod body 401 and a lower rod body 402; the lower rod body 402 is installed at the lower end of the upper rod body 401 by a detachable structure, and the lower rod body 402 is coaxially arranged with the upper rod body 401; a graphite pressing head 410 is provided at the lower end of the lower rod body 402, and the graphite pressing head 410 has good high-temperature and pressure resistance performance. A flange ring 403 is welded to the outer peripheral surface of the top of the upper rod body 401; the flange ring 403 and the first connecting plate 16 of the connecting plate 16 are bolted together to realize the detachable installation of the upper rod body 401.

[0055] In this embodiment, both the upper pressing block 8 and the movable material tray 13 are made of 0Cr25Ni20 heat-resistant steel. 0Cr25Ni20 has good oxidation resistance and can resist oxidation in a high-temperature environment. The dense oxide film formed on its surface can prevent oxygen from further reacting with the matrix metal. At the same time, it has relatively high strength, and its yield strength and tensile strength are both relatively excellent, which enables it to maintain the integrity and stability of the structure under a relatively large load.

[0056] Combined with Figure 4 As shown, combined with Figure 4As shown, the pressing rod assembly 4 is a water-cooled pressing rod assembly with cooling water flowing inside, aiming to cool the pressing rod assembly 4. Specifically, an annular groove is provided on the outer peripheral surface of the upper rod body 401; a sleeve 404 is sleeved on the outer peripheral surface of the upper rod body 401, and the sleeve 404 and the annular groove of the upper rod body 401 jointly form a cooling water accommodation cavity 405; an inlet joint 406 and an outlet joint 407 are provided on the upper part of the upper rod body 401; a main water inlet pipe 401a is opened in the center of the upper rod body 401, the lower part of the main water inlet pipe 401a is communicated with the cooling water accommodation cavity 405, and the upper part is communicated with the inlet joint 406; a water outlet pipe 401b is opened in the upper part of the upper rod body 401, the lower part of the water outlet pipe 401b is communicated with the cooling water accommodation cavity 405, and the middle part is communicated with the outlet joint 407. During use, the inlet joint 406 is connected to a water source through a water pipe, and the water source can be a tap water pipe. The outlet joint 407 is connected to a water storage tank (not shown in the figure) through a water pipe. Cooling water enters from the inlet joint 406, flows into the cooling water accommodation cavity 405 after passing through the main water inlet pipe 401a, and finally flows out through the water outlet pipe 401b and the outlet joint 407.

[0057] To ensure the sealing of the cooling water accommodation cavity 405, full welding is adopted between the upper and lower ends of the sleeve 404 and the upper rod body 401 to form an annular weld.

[0058] Combined with Figure 4 As shown, the main water inlet pipe 401a and the water outlet pipe 401b are both vertical blind hole structures, and the main water inlet pipe 401a and the water outlet pipe 401b are respectively drilled from the top surface of the upper rod body 401 downward. The inlet joint 406 is communicated with the main water inlet pipe 401a through a first transverse hole 401c; the lower part of the main water inlet pipe 401a is communicated with the cooling water accommodation cavity 405 through a second transverse hole 401d; the outlet joint 407 is communicated with the water outlet pipe 401b through a third transverse hole 401e; the lower part of the water outlet pipe 401b is communicated with the cooling water accommodation cavity 405 through a fourth transverse hole 401f. The four transverse holes are all processed by transverse drilling.

[0059] A first plug 408 is provided at the mouth of the main water inlet pipe 401a; a second plug 409 is provided at the mouth of the water outlet pipe 401b; the top surfaces of the first plug 408 and the second plug 409 both abut against the bottom surface of the first connecting plate 16 of the connecting plate 16.

[0060] Combined with Figure 4As shown, a sealing seat installation pipe 17 is provided on the vacuum heating furnace 2, and a flange plate 18 is welded to the top of the sealing seat installation pipe 17; a sealing seat 19 is installed on the flange plate 18; the assembly formed by the upper rod body 401 and the sleeve 404 is in sliding fit with the sealing seat 19; a sealing ring is provided between the sealing seat 19 and the sleeve 404. Specifically, the sealing seat 19 includes a seat pipe 19a, an upper flange 19c welded to the upper part of the seat pipe 19a, and a lower flange 19c welded to the lower part of the seat pipe 19a; a rib plate 19d is welded together between the upper flange 19c, the seat pipe 19a and the lower flange 19c; the outer peripheral surface of the sleeve 404 is in sliding fit with the inner hole of the seat pipe 19a; the sealing ring includes an upper sealing ring 20 and a lower sealing ring 21, and the upper sealing ring 20 and the lower sealing ring 21 are respectively installed in the annular grooves at the upper and lower parts of the central hole of the seat pipe 19a; the upper flange 19c is bolted with an upper sealing gland 22 for pressing the upper sealing ring 20; the lower flange 19c is screwed with a lower sealing gland 23 for pressing the lower sealing ring 21.

[0061] Combined with Figure 4 As shown, the detachable structure between the upper rod body 401 and the lower rod body 402 includes a second connecting plate 24 and a clamping pipe 25; the second connecting plate 24 is installed on the lower end face of the upper rod body 401 by screws; an annular protrusion 402a is integrally formed on the outer peripheral surface of the top of the lower rod body 402; the clamping pipe 25 is sleeved on the lower rod body 402, and the annular protrusion 402a is stuck on the clamping edge at the lower part of the clamping pipe 25; the flange at the upper part of the clamping pipe 25 is bolted to the second connecting plate 24; multiple cushion plates 25 are provided between the top of the lower rod body 402 and the second connecting plate 24. When the lower rod body 402 is deformed after long-term use in a high-temperature environment, it is convenient to disassemble and remove the lower rod body 402 for maintenance or replacement.

[0062] Combined with Figure 1 As shown, the vacuum vertical pressing and straightening furnace further includes a vacuum machine 1 installed in a pit, and the vacuum machine 1 is connected to the vacuum heating furnace 2 for evacuating the vacuum heating furnace 2, and the number of vacuum machines 1 is two. The vacuum machine 1 is a conventional existing device and will not be elaborated here.

[0063] Combined with Figure 2 As shown, the vacuum heating furnace 2 includes a furnace door 6, and casters are provided at the bottom of the furnace door 6. The furnace door 6 runs on the ground by means of the casters, which is convenient for opening or closing the furnace door 6.

[0064] In this embodiment, a pressure sensor (not shown in the figure) is provided between the telescopic rod of the main oil cylinder 3d and the movable beam 3c for detecting the pressure applied by the hydraulic press 3.

[0065] On the other hand, this embodiment also provides a casting orthopedic method, which uses the above-mentioned vacuum vertical pressure orthopedic furnace and includes the following steps:

[0066] S1. Use a forklift to lift the movable material tray 13 out of the vacuum heating furnace 2 and transfer it outside the furnace;

[0067] S2. Place the lower die 12 of the orthopedic die on the movable material tray 13, then place the casting 11 to be orthopedized on the lower die 12, and buckle the upper die 10 on the casting 11; place the upper pressing block 8 on the top of the upper die 10;

[0068] S3. Use a forklift to lift the movable material tray 13 with the orthopedic die, the casting 11, and the upper pressing block 8 and send it into the vacuum heating furnace 2, so that the movable material tray 13 is placed on the support rod assembly 14;

[0069] S4. Evacuate the vacuum heating furnace 2, heat it to the annealing temperature of the casting, and keep it warm; at the same time, use the hydraulic press 3 to drive the pressure rod assembly 4 and press against the upper pressing block 8, so that the upper die 10 applies pressure to orthopedize the casting 11; the hydraulic press 3 applies a set pressure and keeps the pressure until the deformation is eliminated;

[0070] S6. After cooling, use a forklift to lift the movable material tray 13 with the orthopedic die, the casting 11, and the upper pressing block 8 and transfer it outside the furnace, take out the casting 11, and complete the orthopedics.

[0071] The annealing temperature, the heat preservation duration, and the set pressure applied by the hydraulic press 3 are all determined according to the specific casting 11, and will not be elaborated here.

[0072] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A vacuum vertical pressure straightening furnace, comprising a mounting seat (15) arranged in a pit, characterized in that, It further includes: A vacuum heating furnace (2) is provided on the mounting base (15), and a furnace liner (7) is arranged inside it; An orthopedic mold, including an upper mold (10) and a lower mold (12), is arranged inside the furnace liner (7) for fixing a casting (11); Multiple support rod assemblies (14), the upper ends of the support rod assemblies (14) extend into the furnace liner (7); A movable material tray (13) is placed on the tops of multiple support rod assemblies (14) for placing the lower mold (12); A hydraulic press (3), including guide columns (3b) arranged on both sides of the vacuum heating furnace (2), an upper beam body (3a) erected on the tops of the guide columns (3b), a main oil cylinder (3d) installed in the middle of the upper beam body (3a), and a movable beam (3c) arranged below the upper beam body (3a); the lower ends of the guide columns (3b) are fixed on the mounting base (15), the movable beam (3c) is slidably matched with the guide columns (3b), and the telescopic rod of the main oil cylinder (3d) is connected to the movable beam (3c); An upper pressing block (8) is placed on the top surface of the upper mold (10); A pressure rod assembly (4), its upper end is connected to the movable beam (3c), and its lower end passes through the vacuum heating furnace (2) and the furnace liner (7) in sequence and abuts against the upper pressing block (8).

2. The vacuum vertical pressure orthopedic furnace according to claim 1, characterized in that, The pressure rod assembly (4) is a water-cooled pressure rod assembly, and cooling water passes through its interior.

3. The vacuum vertical pressure orthopedic furnace according to claim 1, characterized in that, A connecting rod (5) is welded on the bottom surface of the movable beam (3c), and a first connecting plate (16) is installed at the lower end of the connecting rod (5) by screws; The pressure rod assembly (4) includes an upper rod body (401) and a lower rod body (402); The lower rod body (402) is installed at the lower end of the upper rod body (401) by a detachable structure, and the lower rod body (402) is coaxially arranged with the upper rod body (401); A graphite pressing head (410) is arranged at the lower end of the lower rod body (402); A flange ring (403) is welded on the outer peripheral surface of the top of the upper rod body (401); the flange ring (403) is bolted to the first connecting plate (16).

4. The vacuum vertical pressure orthopedic furnace according to claim 3, characterized in that, An annular groove is arranged on the outer peripheral surface of the upper rod body (401); A sleeve (404) is sleeved on the outer peripheral surface of the upper rod body (401), and the sleeve (404) and the annular groove of the upper rod body (401) together form a cooling water accommodation cavity (405); An inlet joint (406) and an outlet joint (407) are arranged at the upper part of the upper rod body (401); A main water inlet pipe (401a) is opened in the center of the upper rod body (401), the lower part of the main water inlet pipe (401a) is communicated with the cooling water accommodation cavity (405), and the upper part is communicated with the inlet joint (406); An outlet pipe (401b) is opened in the upper part of the upper rod body (401), the lower part of the outlet pipe (401b) is communicated with the cooling water accommodation cavity (405), and the middle part is communicated with the outlet joint (407).

5. The vacuum vertical pressure orthopedic furnace according to claim 4, characterized in that, The upper and lower ends of the sleeve (404) and the upper rod body (401) are respectively formed into annular welds by full welding; The main water inlet pipe (401a) and the water outlet pipe (401b) are both vertical blind hole structures; The water inlet joint (406) is connected to the main water inlet pipe (401a) via a first transverse hole (401c); The lower part of the main water inlet pipe (401a) is connected to the cooling water accommodating chamber (405) via a second transverse hole (401d); The water outlet joint (407) is connected to the water outlet pipe (401b) via a third transverse hole (401e); The lower part of the water outlet pipe (401b) is connected to the cooling water containing chamber (405) via a fourth transverse hole (401f); A first plug (408) is provided at the mouth of the main water inlet pipe (401a); a second plug (409) is provided at the mouth of the water outlet pipe (401b); the top surfaces of the first plug (408) and the second plug (409) are both against the bottom surface of the first connecting plate (16).

6. The vacuum vertical pressure orthopedic furnace according to claim 4, wherein, A sealing seat mounting tube (17) is provided on the vacuum heating furnace (2), and a flange plate (18) is welded on the top of the sealing seat mounting tube (17); A sealing seat (19) is mounted on the flange plate (18); The assembly formed by the upper rod body (401) and the sleeve (404) is slidably matched with the sealing seat (19); and a sealing ring is provided between the sealing seat (19) and the sleeve (404).

7. The vacuum vertical pressure orthopedic furnace according to claim 6, characterized in that, The sealing seat (19) comprises a seat tube (19a), an upper flange edge (19c) welded to the upper part of the seat tube (19a), and a lower flange edge (19c) welded to the lower part of the seat tube (19a); a rib plate (19d) is welded between the upper flange edge (19c), the seat tube (19a) and the lower flange edge (19c); The outer peripheral surface of the sleeve (404) is slidably matched with the inner hole of the seat tube (19a); The sealing ring comprises an upper sealing ring (20) and a lower sealing ring (21), and the upper sealing ring (20) and the lower sealing ring (21) are respectively installed in the annular grooves at the upper part and the lower part of the center hole of the seat tube (19a); The upper flange edge (19c) is installed with an upper sealing gland (22) via bolt connection for pressing the upper sealing ring (20); The lower flange edge (19c) is mounted with a lower sealing gland (23) by means of screws for tightening the lower sealing ring (21).

8. The vacuum vertical pressure orthopedic furnace according to claim 3, characterized in that The detachable structure comprises a second connecting plate (24) and a card tube (25); The second connecting plate (24) is mounted on the lower end surface of the upper rod body (401) by means of screws; An annular protrusion (402a) is integrally formed on the outer peripheral surface of the top end of the lower rod body (402); The clamping tube (25) is sleeved on the lower rod body (402), and the annular protrusion (402a) is clamped on the clamping edge of the lower part of the clamping tube (25); The flange edge at the upper portion of the clamping tube (25) is bolted to the second connecting plate (24); A plurality of pads (25) are arranged between the top end of the lower rod body (402) and the second connecting plate (24).

9. The vacuum vertical pressure orthopedic furnace according to claim 1, characterized in that, It further includes a vacuum machine (1) installed in a pit, and the vacuum machine (1) is connected to the vacuum heating furnace (2) for evacuating the vacuum heating furnace (2). The vacuum heating furnace (2) includes a furnace door (6), and casters are provided at the bottom of the furnace door (6). The number of the guide columns (3b) is four, and guide sleeves are respectively installed at the four corner positions of the movable beam (3c) for sliding cooperation with the guide columns (3b).

10. A method for casting orthopedic correction, characterized in that, Using the vacuum vertical pressure straightening furnace according to any one of claims 1 to 9, comprising the following steps: S1. Use a forklift to lift the movable material tray (13) out of the vacuum heating furnace (2) and transfer it outside the furnace. S2. Place the lower die (12) of the straightening die on the movable material tray (13), then place the casting (11) to be straightened on the lower die (12), and buckle the upper die (10) on the casting (11); place an upper pressing block (8) on the top of the upper die (10). S3. Use a forklift to lift the movable material tray (13) with the straightening die, the casting (11), and the upper pressing block (8) and send it into the vacuum heating furnace (2) so that the movable material tray (13) is placed on the support rod assembly (14). S4. Evacuate the vacuum heating furnace (2), heat it to the annealing temperature of the casting and keep it warm; at the same time, use the hydraulic press (3) to drive the pressure rod assembly (4) and press against the upper pressing block (8) so that the upper die (10) applies pressure to straighten the casting (11); the hydraulic press (3) applies a set pressure and keeps the pressure until the deformation is eliminated. S6. After cooling, use a forklift to lift the movable material tray (13) with the straightening die, the casting (11), and the upper pressing block (8) and transfer it outside the furnace, take out the casting (11), and complete the straightening.

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