Integrated device and method suitable for vacuum / inert gas isothermal reciprocating extrusion and heat treatment process of small and medium-sized titanium alloy

Abstract

The invention discloses an integrated device and method suitable for medium and small titanium alloy vacuum / inert gas isothermal reciprocating extrusion and a heat treatment process, and relates to the field of nonferrous metal plastic processing. The invention solves the problems that the existing small and medium-sized titanium alloy blanks are in contact with air during hot working to cause heat dissipation and temperature drop, so that isothermal forming cannot be realized, the surface layer is oxidized, and the processing precision and the surface quality are not easy to guarantee. According to the invention, the heating of the blank and the mold and the complete sealing of subsequent thermal deformation and thermal treatment processes are ensured, and the problem that the thermal processing precision is influenced by temperature reduction caused by heat dissipation in the process of transferring the small and medium-sized titanium alloy blank from the furnace and thermal deformation is avoided; and deformation can be carried out under vacuum or inert gas, so that the influence of blank oxidation on the surface quality and performance is avoided. After reciprocating extrusion is completed, subsequent heat treatment can be directly carried out, and furnace opening is not needed again. The method is used for preparing non-ferrous metals such as titanium alloy.

Description

Technical Field

[0001] The present invention relates to the field of nonferrous metal plastic processing, and in particular to an integrated device and method suitable for vacuum / inert gas isothermal reciprocating extrusion and heat treatment processes of small and medium-sized titanium alloys. Background Art

[0002] Titanium alloys are widely used in aviation, aerospace, automobiles, ships and other fields due to their excellent comprehensive mechanical properties such as high specific strength, good toughness, corrosion resistance, high temperature resistance, weldability and non-magnetism. For titanium alloys, the finer the structure, the higher the tensile strength of the alloy as the grain structure is refined. Among them, severe plastic deformation (Severe Plastic Deformation, SPD) as an emerging plastic deformation method can introduce a large strain during the deformation process, thereby effectively refining the metal and obtaining submicron or even nano-sized grains. By controlling the microstructure during the deformation process, bulk nanomaterials with high strength and high plasticity can be obtained at the same time. There are no residual shrinkage cavities in the samples prepared by this method, and it is not easy to introduce impurities during the processing. It also overcomes the problems of voids and poor density in the process of preparing ultrafine grain materials by other methods. Researchers have developed a variety of methods for preparing ultrafine-grained materials using SPD technology. Currently, the more mature methods include equal-diameter angle extrusion, high-pressure torsion, cumulative rolling, stir friction processing, and reciprocating extrusion. Among them, reciprocating extrusion as one of the deformation methods has been applied to titanium alloys.

[0003] Titanium alloys usually require heat treatment to regulate their organization after deformation, thereby improving their mechanical properties. However, when heat treatment is performed directly in an air furnace, due to the high activity of titanium alloys, high-temperature heat treatment directly in the air is easy to oxidize, and the oxide layer will fall off layer by layer, which has an adverse effect on the mechanical properties of titanium alloys. Heat treatment of titanium alloys in a vacuum or under inert gas protection can ensure that they are not affected by external oxygen, but the titanium alloy needs to be sealed or transferred to a vacuum tube furnace or heat treated in an inert gas protection furnace. The process flow is cumbersome and the cost is high.

[0004] In the existing reciprocating extrusion device, small and medium-sized titanium alloy billets (diameter and height are both less than 100 mm) come into contact with air during the transfer from the heating furnace and the thermal deformation process, resulting in heat dissipation. The actual deformation temperature is lower than the set temperature, and the surface in direct contact with the air will also oxidize and easily crack, thus affecting the processing accuracy, forming and surface quality.

[0005] In summary, the existing small and medium-sized titanium alloys come into contact with air during hot processing, resulting in heat dissipation. The temperature drops and true isothermal forming cannot be achieved. There is also surface oxidation, which makes it difficult to ensure processing accuracy and has poor surface quality. Summary of the invention

[0006] The purpose of the present invention is to solve the problem that small and medium-sized titanium alloys (diameter and height are both less than 100 mm) contact with air during thermal deformation, resulting in heat dissipation, temperature drop and inability to achieve true isothermal forming, as well as surface oxidation, which makes it impossible to ensure processing accuracy and surface quality. Further, an integrated device and method suitable for vacuum / inert gas isothermal reciprocating extrusion and heat treatment process of small and medium-sized titanium alloys is provided.

[0007] The technical solution of the present invention is:

[0008] An integrated device suitable for vacuum / inert gas isothermal reciprocating extrusion and heat treatment process of small and medium-sized titanium alloys includes a left crossbeam, a right crossbeam, a left movable crossbeam, a right movable crossbeam, a left pressure head, a right pressure head, an upper connecting beam, a lower connecting beam, a reciprocating extrusion processing device, a gas cylinder and a vacuum pumping system. The left crossbeam and the right crossbeam are arranged in parallel on the left and right sides, and the left crossbeam and the right crossbeam are connected by an upper connecting beam and a lower connecting beam arranged up and down. The reciprocating extrusion processing device is located at the center of an area enclosed by the left crossbeam, the right crossbeam, the upper connecting beam and the lower connecting beam. The left movable crossbeam and the right movable crossbeam are respectively located on the left and right sides of the reciprocating extrusion processing device and are slidably installed on the upper connecting beam and the lower connecting beam. One ends of the left pressure head and the right pressure head are arranged oppositely and are respectively installed on the left movable crossbeam and the right movable crossbeam. The other ends of the left pressure head and the right pressure head are respectively sealed and slidably inserted into the reciprocating extrusion processing device. The gas cylinder and the vacuum pumping system are respectively connected to a heating furnace.

[0009] Furthermore, the reciprocating extrusion processing device includes a heating furnace, a left extrusion punch, a right extrusion punch and an extrusion die. The extrusion die is located in the center of the heating furnace. The other ends of the left and right pressure heads are respectively connected to one end of the left extrusion punch and the right extrusion punch. The other ends of the left and right extrusion punches extrude small and medium-sized titanium alloy billets.

[0010] Furthermore, it also comprises an air inlet valve and an air outlet valve, and the air inlet valve and the air outlet valve are installed on the heating furnace.

[0011] Furthermore, it also comprises a horizontal hydraulic press working platform, which is connected with the extrusion concave die.

[0012] Furthermore, it also comprises a furnace door, on which an observation window is arranged, and the furnace door can be opened on the heating furnace.

[0013] Furthermore, it also includes a control cabinet, a display screen and a plurality of control switches. The control cabinet is connected to the vacuum system, the display screen is installed on the control cabinet, and the plurality of control switches are installed below the display screen.

[0014] Preferably, the interior of the heating furnace is coated with a high-temperature sealing insulation layer.

[0015] The present invention also provides a method suitable for vacuum / inert gas isothermal reciprocating extrusion and heat treatment of small and medium-sized titanium alloys, which comprises the following steps:

[0016] Step 1: Preparation of raw materials:

[0017] The outer surface of the small and medium-sized titanium alloy billet (referring to the titanium alloy billet with a diameter and a height of less than 100 mm) is polished with 120-mesh sandpaper to remove oil stains, and then polished with 400-mesh, 800-mesh, 1000-mesh, 1200-mesh, and 2000-mesh sandpaper in sequence to make the surface clean and smooth, and the polished small and medium-sized titanium alloy billet is placed in a mixture of acetone and anhydrous ethanol for ultrasonic cleaning, and then cleaned with anhydrous ethanol and dried with a hair dryer;

[0018] Step 2: Equipment preparation:

[0019] Step 21: Apply high temperature graphite lubricant to the inner wall of the extrusion die.

[0020] Step 22: Apply glass lubricant on the surface of the small and medium-sized titanium alloy billet and then put it into the reciprocating extrusion processing device and close the furnace door;

[0021] Step 23: Start the vacuum pump group and evacuate the inside of the heating furnace to 2.5-3×10 -1 ~10 -3 pa vacuum environment;

[0022] Step 3: Open the gas cylinder and fill the furnace body with argon gas to -0.05MPa;

[0023] Step 4: Preheating small and medium-sized titanium alloy billets;

[0024] Turn on the heating component, heat the mold and small and medium-sized titanium alloy billets to the deformation temperature of 600℃~1000℃, and understand the gas pressure and temperature values ​​in the heating furnace in real time through the display screen.

[0025] Then, the heating power of the heating element is controlled to keep the temperature of the left extrusion punch, the right extrusion punch, the extrusion die and the titanium alloy blank constant at 600° C. to 1000° C.;

[0026] Step 5: Extrusion of small and medium-sized titanium alloy billets:

[0027] After keeping the temperature for 20 to 60 minutes, pressurize the left pressure head to move it to the right, and extrude the small and medium-sized titanium alloy billet placed in the left die cavity in advance, and stop applying pressure after it completely enters the right die cavity;

[0028] Then, the left pressing head is withdrawn to the set position, and the right pressing head is driven in the reverse direction, so that the small and medium-sized titanium alloy billet completely enters the left die cavity, and the extrusion is stopped to complete one-pass processing. The above steps are repeated to complete the reciprocating extrusion processing;

[0029] Step 6: After the hot processing of small and medium-sized titanium alloy billets is completed, wait for the furnace body to cool naturally, and then set the heating rate, heat treatment temperature and holding time through the control cabinet for subsequent heat treatment.

[0030] Furthermore, in step 22, the surface of the small-sized titanium alloy billet is coated with glass lubricant before being placed in the reciprocating extrusion device.

[0031] Furthermore, in step five, the extrusion die is coated with high temperature graphite lubricant before pressurization.

[0032] Compared with the prior art, the present invention has the following effects:

[0033] The small and medium-sized titanium alloy billets in the present invention can be integrally formed under vacuum or inert gas protection and in an isothermal environment, which can achieve vacuum / inert gas isothermal forming, improve deformation accuracy, improve surface quality, and no converter is required after deformation, and subsequent heat treatment can be carried out directly in the device, thereby achieving the reuse of vacuum and inert gas and simplifying the process flow.

[0034] The present invention can ensure that the heating of the blank and the mold, as well as the subsequent thermal deformation and heat treatment processes, are completely closed, and the heat dissipation of small and medium-sized titanium alloy blanks during transfer from the furnace and during the hot processing process causes the temperature to drop, thereby affecting the hot processing accuracy. In addition, the deformation can be performed under vacuum or inert gas, thereby preventing the blank from being oxidized and affecting the performance. After the extrusion is completed, subsequent heat treatment can be directly performed without opening the furnace again, which can ensure the reuse of vacuum or inert gas, reduce costs, and improve production efficiency. The present invention can be used for the preparation of non-ferrous metals such as titanium alloys. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention. Figure 2 It is a schematic diagram of the heating furnace 4.

[0036] In the figure:

[0037] 1. Left crossbeam, 2. Left movable crossbeam, 3. Upper connecting beam, 4. Heating furnace, 5. Left pressure head, 6. Left extrusion punch, 7. Extrusion die, 8. Right extrusion punch, 9. Right pressure head, 10. Right movable crossbeam, 11. Right crossbeam, 12. Inlet valve, 13. Exhaust valve, 14. Lower connecting beam, 15. Horizontal hydraulic press working platform, 16. Titanium alloy billet, 17. Gas cylinder, 18. Vacuum extraction system, 19. Multiple control switches, 20. Display screen, 21. Control cabinet, 22. Furnace door, 23. Observation window. DETAILED DESCRIPTION

[0038] Specific implementation method 1: Combination Figure 1 to Figure 2 The present embodiment includes a left crossbeam 1, a right crossbeam 11, a left movable crossbeam 2, a right movable crossbeam 10, a left pressure head 5, a right pressure head 9, an upper connecting beam 3, a lower connecting beam 14, a reciprocating extrusion processing device, a gas cylinder 17 and a vacuum system 18. The left crossbeam 1 and the right crossbeam 11 are arranged in parallel on the left and right sides, and the left crossbeam 1 and the right crossbeam 11 are connected by the upper connecting beam 3 and the lower connecting beam 14 arranged up and down. The reciprocating extrusion processing device is located on the left crossbeam 1, the right crossbeam 11, the upper connecting beam 3 and the lower connecting beam 14. At the center of the area enclosed by the connecting beam 3 and the lower connecting beam 14, the left movable crossbeam 2 and the right movable crossbeam 10 are respectively located on the left and right sides of the reciprocating extrusion processing device and are slidably installed on the upper connecting beam 3 and the lower connecting beam 14, the left pressure head 5 and the right pressure head 9 are arranged opposite to each other and are respectively installed on the left movable crossbeam 2 and the right movable crossbeam 10, the other ends of the left pressure head 5 and the right pressure head 9 are respectively sealed and slidably inserted into the reciprocating extrusion processing device, and the gas cylinder 17 and the vacuum system 18 are respectively connected to the heating furnace 4.

[0039] The left and right movable crossbeams 2 and 11 of the present embodiment are fixed with a left pressure head 5 and a right pressure head 9 at the bottom, a heating furnace 4, and the left and right pressure heads 5, 9 and the heating furnace 4 are slidably matched. The bottom ends of the pressure heads (referring to the left pressure head 5 and the right pressure head 9) extend into the heating furnace 4 and are connected to the extrusion punches (referring to the left extrusion punch 6 and the right extrusion punch 8). The extrusion die 7 is fixedly connected to the horizontal hydraulic press working platform 15 by high-temperature bolts. The gas cylinder 17 and the vacuum system 18 are installed on the outside of the furnace body of the heating furnace 4 and are connected to the furnace body of the heating furnace 4. The control cabinet 21 is provided with a vacuum pump switch, a heating element switch and a hydraulic press switch 19, which can be used to control the vacuum pump and the heating rate, the heating time and the insulation time as well as the left arm and the right arm of the hydraulic press. The display screen 19 can display the air pressure, temperature and pressure in the furnace. The heating furnace 4 is provided with a furnace door 22 and an observation window 23.

[0040] The small and medium-sized titanium alloy billet 16 of this embodiment is in a heating furnace 4 during heating and deformation, and the environment is a vacuum or inert gas and is in an isothermal environment.

[0041] Specific implementation method 2: Combination Figure 1 to Figure 2To illustrate the present embodiment, the reciprocating extrusion processing device of the present embodiment includes a heating furnace 4, a left extrusion punch 6, a right extrusion punch 8 and an extrusion die 7. The extrusion die 7 is located at the center of the heating furnace 4. The other ends of the left ram 5 and the right ram 9 are respectively connected to one end of the left extrusion punch 6 and the right extrusion punch 8. The other ends of the left extrusion punch 6 and the right extrusion punch 8 extrude the titanium alloy billet 16.

[0042] In this arrangement, the pressure heads (left pressure head 5 and right pressure head 9) of the horizontal hydraulic press are slidably matched with the heating furnace 4, and a high-temperature sealing insulation layer is provided inside the heating furnace 4, and a furnace door 22 is provided, and the material can be discharged by opening and closing the furnace door and high-temperature graphite can be applied inside the extrusion die 16. The heating furnace body includes an air inlet valve 12 and an air outlet valve 13, and a vacuum pump 18 and a gas cylinder 17 are provided on the outside. Other components and connection relationships are the same as those in the first embodiment.

[0043] Specific implementation method three: Combination Figure 1 to Figure 2 To explain this embodiment, this embodiment further includes an air inlet valve 12 and an air outlet valve 13 , and the air inlet valve 12 and the air outlet valve 13 are installed on the heating furnace 4 .

[0044] With such arrangement, there are an air inlet valve and an air outlet valve on the furnace body, which can be used for exhausting and taking in air. Other components and connection relationships are the same as those in the first or second specific implementation.

[0045] Specific implementation method four: Combination Figure 1 to Figure 2 This embodiment is described, and this embodiment also includes a horizontal hydraulic press working platform 15, and the horizontal hydraulic press working platform 15 is connected to the extrusion die 7. In this way, the reciprocating extrusion processing device is installed on the horizontal hydraulic press, and the installation is firm, the positions of each part, the connection relationship must be correct, and the operation is carried out in sequence. The other components and connection relationships are the same as any one of the specific embodiments one to three.

[0046] Specific implementation method five: Combination Figure 1 to Figure 2 To explain this embodiment, this embodiment further includes a furnace door 22 , on which an observation window 23 is provided, and the furnace door 22 can be opened on the heating furnace 4 .

[0047] Such a configuration can be used to place and take materials and observe the conditions of materials, and a high temperature resistant sealing insulation layer is provided inside. The heating furnace 4 of this embodiment is provided with a control cabinet 21 outside, on which there are a vacuum pump switch, a heating element switch, a hydraulic press control switch 19, etc., and the display screen 20 can display the gas pressure, temperature and pressure of the press in the heating furnace, etc. The other structures and components are the same as any one of the specific embodiments one to four.

[0048] Specific implementation method six: Combination Figure 1 to Figure 2To illustrate this embodiment, this embodiment also includes a control cabinet 21, a display screen 20 and a plurality of control switches 19. The control cabinet 21 is connected to the vacuum system 18, the display screen 20 is installed on the control cabinet 21, and the plurality of control switches 19 are installed below the display screen 20.

[0049] This arrangement can be used to control the vacuum pump and heating rate, heating time and holding time, as well as the left and right arms of the hydraulic press, and the display screen can display the gas pressure, temperature and pressure in the furnace. Other components and connection relationships are the same as any one of the specific embodiments one to three.

[0050] Specific implementation method seven: Combination Figure 1 to Figure 2 To explain this embodiment, the interior of the heating furnace 4 of this embodiment is coated with a high-temperature sealing and heat-insulating layer. Other components and connection relationships are the same as any one of the specific embodiments 1 to 6.

[0051] Specific implementation method eight: Combination Figure 1 to Figure 2 The present embodiment is described, and the method of the present embodiment is characterized in that it comprises the following steps:

[0052] Step 1: Preparation of raw materials:

[0053] The outer surface of the small and medium-sized titanium alloy blank was polished with 120-mesh sandpaper to remove oil stains, and then polished with 400-mesh, 800-mesh, 1000-mesh, 1200-mesh, and 2000-mesh sandpaper in sequence to make the surface clean and smooth. The polished small and medium-sized titanium alloy blank (diameter and height are both less than 100 mm) was placed in a mixture of acetone and anhydrous ethanol for ultrasonic cleaning, and then cleaned with anhydrous ethanol and dried with a hair dryer;

[0054] Step 2: Equipment preparation:

[0055] Step 21: First, apply high-temperature graphite lubricant to the inner wall of the extrusion die 7.

[0056] Step 22: Coat the surface of the small and medium-sized titanium alloy billet 16 with glass lubricant and then put it into the reciprocating extrusion processing device, and close the furnace door;

[0057] Step 23: Start the vacuum pump group 18 to evacuate the interior of the heating furnace 4 to 2.5-3×10 -1 ~10 -3 pa vacuum environment;

[0058] Step 3: Open the gas cylinder 17 and fill the furnace body of the heating furnace 4 with argon gas to -0.05MPa;

[0059] Step 4: preheating the small and medium-sized titanium alloy billet 16;

[0060] The heating assembly is turned on to heat the mold and the small and medium-sized titanium alloy blank 16 to a deformation temperature of 600°C to 1000°C. The air pressure and temperature values ​​in the heating furnace 4 are obtained in real time through the display screen 20.

[0061] Then, the heating power of the heating element is controlled to keep the temperature of the left extrusion punch 6, the right extrusion punch 8, the extrusion die 7 and the small and medium-sized titanium alloy blank 16 at a constant temperature of 600° C. to 1000° C.;

[0062] Step 5: Extrusion of small and medium-sized titanium alloy billets 16:

[0063] After keeping the temperature for 20 to 60 minutes, pressurize the left pressure head 5 to move it to the right, and extrude the small and medium-sized titanium alloy billet 16 pre-placed in the left die cavity, and stop applying pressure after the billet completely enters the right die cavity;

[0064] Then, the left ram 5 is withdrawn to the set position, and the right ram 9 is driven in the reverse direction, so that the small and medium-sized titanium alloy billet 16 completely enters the left die cavity, and the extrusion is stopped to complete one-pass processing, and the above steps are repeated to complete the reciprocating extrusion processing;

[0065] Step 6: After the hot processing of small and medium-sized titanium alloys is completed, after the furnace body is naturally cooled, the heating rate, heat treatment temperature and holding time are set through the control cabinet 21 for subsequent heat treatment.

[0066] After the present embodiment is modified, the vacuum or inert gas environment can be used to directly perform heat treatments such as solution treatment and aging in the furnace without sealing the tube or transferring the tube to a tubular vacuum furnace for heat treatment.

[0067] Specific implementation method nine: Combination Figure 1 and Figure 2 To explain this embodiment, in step 22 of this embodiment, glass lubricant is applied to the small and medium-sized titanium alloy billets before they are placed in the reciprocating extrusion processing device, and in step 5, high-temperature graphite lubricant is applied to the extrusion die 7 before pressurization.

[0068] The other components and connection relationships are the same as any one of the specific implementation modes 1 to 8.

[0069] The present invention provides a small and medium-sized titanium alloy vacuum / inert gas isothermal reciprocating extrusion and heat treatment integrated device, including an extrusion punch connected to a horizontal extruder head, an extrusion die fixed to a workbench, a heating furnace, a vacuum pump, a gas cylinder, a control cabinet and other devices, which can realize that the titanium alloy is completely in a vacuum / inert gas isothermal environment during the reciprocating extrusion process, and solves the problem that small and medium-sized titanium alloys contact with air during thermal deformation, resulting in heat dissipation, temperature drop, and inability to achieve true isothermal forming, as well as surface oxidation, making it difficult to ensure processing accuracy and surface oxidation. The device can realize vacuum / inert gas isothermal reciprocating extrusion and can perform subsequent heat treatment without opening the furnace again after the deformation is completed, saving vacuum / inert gas resources, reducing process costs, and simplifying the process flow.

[0070] Combination Figure 1 to Figure 2 The working principle of the present invention is described:

[0071] The present invention comprises a left crossbeam and a right crossbeam, a left pressure head and a right pressure head are fixed at the bottom of the left movable crossbeam and the right movable crossbeam, the cross sections of the left and right pressure heads are circular, a heating furnace is provided with a furnace door and an observation window, the pressure head and the heating furnace are slidably matched, the bottom end of the pressure head extends into the heating furnace and is connected with an extrusion convex die, an extrusion concave die and a horizontal hydraulic press working platform are fixedly connected by high-temperature bolts, a gas cylinder and a vacuum system are installed on the outside of the furnace body and are connected with the inside of the heating furnace body.

[0072] There is a high-temperature sealing ring between the pressure head and the heating furnace, and the pressure head and the extrusion punch are fixed by high-temperature screws.

[0073] The heating furnace is equipped with a furnace door and an observation window, which can be used to place and take materials as well as observe the condition of the materials. There is a high-temperature resistant sealed insulation layer inside. There are air inlet valves and air outlet valves on the furnace body, which can be used for exhaust and air intake.

[0074] The extrusion die is fixedly connected to the workbench below the horizontal hydraulic press. Before extrusion, the extrusion die should be coated with high-temperature graphite lubricant, and the surface of the titanium alloy billet should be coated with glass lubricant.

[0075] The vacuum pump and gas cylinder are connected to the heating furnace to evacuate the vacuum and pass inert gas.

[0076] A control cabinet is provided on the outside of the heating furnace, on which are provided a vacuum pump switch, a heating element switch, and a hydraulic press switch, which can be used to control the vacuum pump and heating rate, heating time and insulation time, as well as the left and right arms of the hydraulic press. The display screen can display the air pressure, temperature, and pressure in the furnace.

[0077] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated device suitable for vacuum / inert gas isothermal reciprocating extrusion and heat treatment of small and medium-sized titanium alloys, characterized in that: It comprises a left crossbeam (1), a right crossbeam (11), a left movable crossbeam (2), a right movable crossbeam (10), a left pressure head (5), a right pressure head (9), an upper connecting beam (3), a lower connecting beam (14), a reciprocating extrusion processing device, a gas cylinder (17) and a vacuum pumping system (18). The left crossbeam (1) and the right crossbeam (11) are arranged in parallel on the left and right sides, and the left crossbeam (1) and the right crossbeam (11) are connected by an upper connecting beam (3) and a lower connecting beam (14) arranged up and down. The reciprocating extrusion processing device is located at the center of the area enclosed by the left crossbeam (1), the right crossbeam (11), the upper connecting beam (3) and the lower connecting beam (14). The left movable crossbeam (2) and the right movable crossbeam (10) are respectively located on the left and right sides of the reciprocating extrusion processing device and are slidably mounted on the upper connecting beam (3) and the lower connecting beam (14). One ends of the left pressure head (5) and the right pressure head (9) are arranged opposite to each other and are respectively mounted on the left movable crossbeam (2) and the right movable crossbeam (10). The other ends of the left pressure head (5) and the right pressure head (9) are respectively sealed and slidably inserted into the reciprocating extrusion processing device. The gas cylinder (17) and the vacuum system (18) are respectively connected to the heating furnace (4).

2. The integrated device for vacuum / inert gas isothermal reciprocating extrusion and heat treatment of small and medium-sized titanium alloys according to claim 1 is characterized in that: The reciprocating extrusion processing device comprises a heating furnace (4), a left extrusion punch (6), a right extrusion punch (8) and an extrusion concave die (7). The extrusion die (7) is located at the center of the heating furnace (4); the other ends of the left pressure head (5) and the right pressure head (9) are respectively connected to one end of the left extrusion punch (6) and the right extrusion punch (8); and the other ends of the left extrusion punch (6) and the right extrusion punch (8) extrude the titanium alloy billet (16).

3. The integrated device for vacuum / inert gas isothermal reciprocating extrusion and heat treatment of small and medium-sized titanium alloys according to claim 1 is characterized in that: It also includes an air inlet valve (12) and an air outlet valve (13), and the air inlet valve (12) and the air outlet valve (13) are installed on the heating furnace (4).

4. The integrated device for vacuum / inert gas isothermal reciprocating extrusion and heat treatment of small and medium-sized titanium alloys according to claim 1 is characterized in that: It also comprises a horizontal hydraulic press working platform (15), which is connected to the extrusion die (7).

5. The integrated device for vacuum / inert gas isothermal reciprocating extrusion and heat treatment of small and medium-sized titanium alloys according to claim 4 is characterized in that: It also includes a furnace door (22) with an observation window (23) on it. The furnace door (22) can be opened on the heating furnace (4).

6. The integrated device for vacuum / inert gas isothermal reciprocating extrusion and heat treatment of small and medium-sized titanium alloys according to claim 5 is characterized in that: It also includes a control cabinet (21), a display screen (20) and a plurality of control switches (19). The control cabinet (21) is connected to the vacuum system (18), the display screen (20) is installed on the control cabinet (21), and the plurality of control switches (19) are installed below the display screen (20).

7. The integrated device for vacuum / inert gas isothermal reciprocating extrusion and heat treatment of small and medium-sized titanium alloys according to claim 2 is characterized in that: The interior of the heating furnace (4) is coated with a high-temperature sealing and heat-insulating layer.

8. A method suitable for vacuum / inert gas isothermal reciprocating extrusion and heat treatment of small and medium-sized titanium alloys, characterized in that: It includes the following steps: Step 1: Preparation of raw materials: The outer surface of the small and medium-sized titanium alloy blank (16) is polished with 120-mesh sandpaper to remove oil stains, and then polished with 400-mesh, 800-mesh, 1000-mesh, 1200-mesh, and 2000-mesh sandpaper in sequence to make the surface clean and smooth, and the polished small and medium-sized titanium alloy blank is placed in a mixture of acetone and anhydrous ethanol for ultrasonic cleaning, and then cleaned with anhydrous ethanol and dried with a hair dryer; Step 2: Equipment preparation: Step 21: First, apply high-temperature graphite lubricant to the inner wall of the extrusion die (7). Step 22: coating the surface of the small- and medium-sized titanium alloy billet (16) with glass lubricant and then placing it into a reciprocating extrusion processing device, and closing the furnace door; Step 23: Start the vacuum pump group (18) to evacuate the interior of the heating furnace (4) to 2.5-3×10 -1 ~10 -3 pa vacuum environment; Step 3: Open the gas cylinder (17) and fill the furnace body of the heating furnace (4) with argon gas to -0.05 MPa; Step 4: preheating the small and medium-sized titanium alloy billet (16); The heating assembly is turned on to heat the mold and the titanium alloy blank (16) to a deformation temperature of 600°C to 1000°C, and the air pressure and temperature values ​​in the heating furnace (4) are obtained in real time through the display screen (20). Then, the heating power of the heating element is controlled so that the temperature of the left extrusion punch (6), the right extrusion punch (8), the extrusion die (7) and the titanium alloy blank (16) is kept constant at 600° C. to 1000° C.; Step 5: Extrusion of small and medium-sized titanium alloy billets (16): After keeping the temperature for 20 to 60 minutes, pressurizing the left pressure head (5) to move it to the right, and extruding the small and medium-sized titanium alloy billet (16) pre-placed in the left die cavity, and stopping the pressure after the billet completely enters the right die cavity; Then, the left pressing head (5) is withdrawn to the set position, and the right pressing head (9) is driven in the reverse direction, so that the small and medium-sized titanium alloy billet (16) completely enters the left die cavity, and the extrusion is stopped to complete a processing, and the above steps are repeated to complete the reciprocating extrusion processing; Step 6: After the hot processing of the small and medium-sized titanium alloy billet (16) is completed, the heating rate, heat treatment temperature and holding time are set through the control cabinet (21) after the furnace body is naturally cooled down, so as to carry out subsequent heat treatment.

9. The method according to claim 8, characterized in that: In step 2, the small-sized titanium alloy blank (16) is coated with glass lubricant before being placed in the device, and in step 5, the extrusion die (7) is coated with high-temperature graphite lubricant before pressurization.

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