The application relates to a device and method suitable for the integration of the vacuum / inert gas isothermal reciprocating extrusion and heat treatment processes of small and medium-sized titanium alloys

Abstract

The application relates to an integrated device and method suitable for small and medium-sized titanium alloy vacuum / inert gas isothermal reciprocating extrusion and heat treatment process, and relates to the field of non-ferrous metal plastic working. The application solves the problems that the existing small and medium-sized titanium alloy blanks cannot realize isothermal forming due to heat dissipation, temperature drop and surface layer oxidation during hot working, and the processing precision and surface quality cannot be guaranteed. The application guarantees that the blanks and the die are heated, and the subsequent heat deformation and heat treatment process are completely closed, avoids the problems that the small and medium-sized titanium alloy blanks are transferred from the furnace and the heat deformation process is affected by the temperature drop caused by heat dissipation, and the heat processing precision is affected, and the blanks can be deformed in vacuum or inert gas, so that the surface quality and performance are not affected by blank oxidation. After the reciprocating extrusion is completed, subsequent heat treatment can be directly carried out, and the furnace does not need to be opened again. The application is used for preparing titanium alloy and other non-ferrous metals.

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, and ships due to their excellent comprehensive mechanical properties, including high specific strength, good toughness, corrosion resistance, high temperature resistance, weldability, and non-magnetism. For titanium alloys, the finer the microstructure, the higher the tensile strength of the alloy as the grain structure refines. Severe plastic deformation (SPD), as an emerging plastic deformation method, can introduce large strains during the deformation process, effectively refining the metal and obtaining submicron or even nanometer-sized grains. By controlling the microstructure during the deformation process, bulk nanomaterials with both high strength and high plasticity can be obtained. The samples produced by this method do not contain residual shrinkage cavities, are less likely to introduce impurities during processing, and overcome the problems of voids and poor density in ultrafine-grained materials prepared 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 angular 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] After deformation, titanium alloys usually require heat treatment to regulate their structure and improve their mechanical properties. However, when heat treatment is performed directly in an air furnace, due to the high activity of titanium alloys, direct high-temperature heat treatment in air is prone to oxidation, and the oxide layer will fall off layer by layer, which has an adverse effect on the mechanical properties of the titanium alloy. 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 in an inert gas protection furnace for heat treatment. 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 transfer from the heating furnace and thermal deformation, resulting in heat dissipation. The actual deformation temperature is lower than the set temperature, and the surface in direct contact with air will also oxidize and easily crack, thereby 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 present invention aims to address the problem of heat dissipation during thermal deformation of small and medium-sized titanium alloys (less than 100 mm in diameter and height) due to contact with air, resulting in a temperature drop that prevents true isothermal forming, and surface oxidation, which compromises machining accuracy and surface quality. Furthermore, the present invention provides an integrated device and method for vacuum / inert gas isothermal reciprocating extrusion and heat treatment of small and medium-sized titanium alloys.

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

[0008] An integrated device suitable for vacuum / inert gas isothermal reciprocating extrusion and heat treatment processes 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 parallel to each other, and the left crossbeam and the right crossbeam are connected by the upper connecting beam and the lower connecting beam arranged up and down. The reciprocating extrusion processing device is located at the center of the 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 beam 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 opposite to each other and are respectively installed on the left movable crossbeam and the right movable beam. 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 the 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 pressure head and the right pressure head are respectively connected to one end of the left extrusion punch and the right extrusion punch. The other ends of the left extrusion punch and the right extrusion punch extrude small and medium-sized titanium alloy billets.

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

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

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

[0013] Furthermore, it also includes a control cabinet, a display screen and multiple control switches. The control cabinet is connected to the vacuum system, the display screen is installed on the control cabinet, and the multiple 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 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 a titanium alloy billet with a diameter and height of less than 100 mm) 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 billet 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;

[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 to the surface of the small and medium-sized titanium alloy billet and then place it into the reciprocating extrusion processing device and close the furnace door;

[0021] Step 2 and 3: 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 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. Stop applying pressure after the billet completely enters the right die cavity.

[0028] Then, the left ram is withdrawn to the set position, and the right ram 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 process;

[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 should be 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 realize 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 realizing the reuse of vacuum and inert gas and simplifying the process flow.

[0034] The present invention ensures that the heating of the billet and the die, as well as subsequent thermal deformation and heat treatment processes, are completely sealed, preventing heat dissipation during transfer from the furnace and during heat treatment of small and medium-sized titanium alloy billets, which can lead to temperature drops and affect heat treatment accuracy. Furthermore, deformation can be performed under vacuum or inert gas, thereby preventing oxidation of the billet from affecting performance. Subsequent heat treatment can be performed directly after extrusion is completed without the need to reopen the furnace, ensuring the reuse of vacuum or inert gas, reducing costs, and improving production efficiency. The present invention can be used in 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 picture:

[0037] 1. Left crossbeam, 2. Left movable crossbeam, 3. Upper connecting beam, 4. Heating furnace, 5. Left ram, 6. Left extrusion punch, 7. Extrusion die, 8. Right extrusion punch, 9. Right ram, 10. Right movable crossbeam, 11. Right crossbeam, 12. Inlet valve, 13. Outlet valve, 14. Lower connecting beam, 15. Horizontal hydraulic press working platform, 16. Titanium alloy billet, 17. Gas cylinder, 18. Vacuum 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 Figures 1 to 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 parallel to each other, 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. In 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. One ends of 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. The gas cylinder 17 and the vacuum system 18 are respectively connected to the heating furnace 4.

[0039] In this embodiment, the left movable crossbeam 2 and the right movable crossbeam 11 are fixed with a left pressure head 5 and a right pressure head 9 at the bottom, and a heating furnace 4. The left pressure head 5, the right pressure head 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. A vacuum pump switch, a heating element switch and a hydraulic press switch 19 are provided on the top of the control cabinet 21, which can be used to control the vacuum pump and the heating rate, the heating time and the holding 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 placed inside the 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 Figures 1 to 2To illustrate this embodiment, the reciprocating extrusion processing device of this 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 in 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] With this arrangement, the rams of the horizontal hydraulic press (left ram 5 and right ram 9) slide in contact with the heating furnace 4. The interior of the heating furnace 4 is equipped with a high-temperature sealing and insulation layer and a furnace door 22, which allows for material discharge and the application of high-temperature graphite to the interior of the extrusion die 16. The heating furnace body includes an air inlet valve 12 and an air outlet valve 13, and is externally equipped with a vacuum pump 18 and a gas cylinder 17. Other components and connections are the same as those in the first embodiment.

[0043] Specific implementation method three: Combination Figures 1 to 2 To illustrate 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 this arrangement, the furnace body has an air inlet valve and an air outlet valve for exhausting and taking in air. Other components and connection relationships are the same as those in the first or second embodiment.

[0045] Specific implementation method four: Combination Figures 1 to 2 This embodiment further includes a horizontal hydraulic press work platform 15 connected to the extrusion die 7. With this arrangement, the reciprocating extrusion processing device is mounted on the horizontal hydraulic press, securely installed, with all components positioned and connected correctly and operated in sequence. The remaining components and connections are the same as those in any one of the first to third embodiments.

[0046] Specific implementation method five: Combination Figures 1 to 2 This embodiment will be described. This embodiment further includes a furnace door 22 , on which an observation window 23 is provided. The furnace door 22 can be opened on the heating furnace 4 .

[0047] This arrangement allows for placing and removing materials and observing their condition, and includes a high-temperature resistant, sealed, and heat-insulating layer. The heating furnace 4 of this embodiment is provided with a control cabinet 21 on the outside, which houses a vacuum pump switch, a heating element switch, a hydraulic press control switch 19, and the like. The display screen 20 can display the furnace's internal pressure, temperature, and press pressure. Other structures and components are the same as those of any one of the first to fourth embodiments.

[0048] Specific implementation method six: combination Figures 1 to 2The embodiment is described, the embodiment further comprises a control cabinet 21, a display screen 20 and a plurality of control switches 19, the control cabinet 21 is connected with the vacuumizing 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] In this way, the display screen can be used to control the vacuum pump and the heating rate, the heating time and the holding time, and the left arm and the right arm of the hydraulic machine, and can display the gas pressure, the temperature and the pressure in the furnace.

[0050] Specific embodiment seven: in combination Figures 1 to 2 The embodiment is described, the inside of the heating furnace 4 of the embodiment is coated with a high-temperature sealing and heat-insulating layer.

[0051] Specific embodiment eight: in combination Figures 1 to 2 The embodiment is described, the method of the embodiment is characterized in that it comprises the following steps:

[0052] Step one: preparation of raw materials:

[0053] The outer surface of the small and medium-sized titanium alloy blank 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.

[0054] Step two: preparation of equipment:

[0055] Step two one: first, the inner wall of the extrusion die 7 is coated with high-temperature graphite lubricant,

[0056] Step two two: the surface of the small and medium-sized titanium alloy blank 16 is coated with glass lubricant and then put into the reciprocating extrusion processing device, and the furnace door is closed tightly;

[0057] Step two three: start the vacuum pump set 18, and the inside of the heating furnace 4 is pumped to a vacuum environment of 2.5-3x10 -1 ~ 10 -3 Pa;

[0058] Step three: open the gas cylinder 17 to fill argon into the furnace body of the heating furnace 4 to-0.05MPa;

[0059] Step four: preheat the small and medium-sized titanium alloy blank 16;

[0060] Turn on the heating assembly, heat the mold and the small and medium-sized titanium alloy billet 16 to a deformation temperature of 600°C to 1000°C, and obtain the gas pressure and temperature values ​​in the heating furnace 4 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 billet 16 constant at 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 pressing head 5 to move it to the right, and extrude the small and medium-sized titanium alloy billet 16 placed in the left die cavity. 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 is completely entered into the left die cavity, and the extrusion is stopped to complete one-pass processing. The above steps are repeated to complete the reciprocating extrusion process;

[0065] Step 6: After the heat treatment of small and medium-sized titanium alloys is completed, the heating rate, heat treatment temperature and holding time are set through the control cabinet 21 after the furnace body cools down naturally so as to carry out subsequent heat treatment.

[0066] After modification, this embodiment can be directly subjected to heat treatments such as solution treatment and aging in a furnace using a vacuum or inert gas environment, without the need to seal the tube or transfer the tube to a tubular vacuum furnace for heat treatment.

[0067] Specific implementation method nine: Combination Figure 1 and Figure 2 To illustrate 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 embodiments 1 to 8.

[0069] The present invention provides an integrated device for vacuum / inert gas isothermal reciprocating extrusion and heat treatment of small and medium-sized titanium alloys. The device comprises an extrusion punch connected to the horizontal extruder ram, an extrusion die fixed to a workbench, a heating furnace, a vacuum pump, a gas cylinder, a control cabinet, and other devices. This device allows the titanium alloy to be completely in a vacuum / inert gas isothermal environment during the reciprocating extrusion process. This solves the problems of heat dissipation and temperature drop during thermal deformation of small and medium-sized titanium alloys, which prevent true isothermal forming from occurring due to contact with air, as well as surface oxidation, which makes it difficult to ensure machining accuracy. The device can achieve vacuum / inert gas isothermal reciprocating extrusion and can perform subsequent heat treatment after deformation without the need to re-open the furnace, thus conserving vacuum / inert gas resources, reducing process costs, and simplifying the process flow.

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

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

[0076] A control cabinet is provided on the outside of the heating furnace, on which are installed 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 holding time, as well as the left and right arms of the hydraulic press. The display screen can display the air pressure, temperature, and pressure inside the furnace.

[0077] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An integrated device suitable for vacuum / inert gas isothermal reciprocating extrusion and heat treatment of small and medium-sized titanium alloys, characterized by: 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 parallel to each other, 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 above and below. 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 end 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). The reciprocating extrusion processing device 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), and 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).

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: 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).

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 a horizontal hydraulic press working platform (15), which is connected to the extrusion die (7).

4. The integrated device for vacuum / inert gas isothermal reciprocating extrusion and heat treatment of small and medium-sized titanium alloys according to claim 3 is characterized in that: It also includes a furnace door (22) with an observation window (23) on the furnace door, and the furnace door (22) can be opened on the heating furnace (4).

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 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).

6. 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 interior of the heating furnace (4) is coated with a high-temperature sealing insulation layer.

7. A method for using the integrated device for vacuum / inert gas isothermal reciprocating extrusion and heat treatment of small and medium-sized titanium alloys according to any one of claims 1 to 6, 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) 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 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; 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 2 and 3: Start the vacuum pump group and evacuate the interior of the heating furnace (4) to 2.5×10 -3 ~3×10 -1 Pa vacuum environment; Step 3: Open the gas cylinder (17) and fill the heating furnace (4) with argon gas to -0.05 MPa; Step 4: Preheating the small and medium-sized titanium alloy billet (16); Turn on the heating assembly, heat the mold and the titanium alloy blank (16) to a deformation temperature of 600°C to 1000°C, and obtain the air pressure and temperature values ​​in the heating furnace (4) 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, 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; 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 one-pass processing. The above steps are repeated to complete the reciprocating extrusion processing; Step 6: After the heat treatment of the small and medium-sized titanium alloy billets (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, so as to carry out subsequent heat treatment.

8. The method according to claim 7, wherein: In step 2, the small-sized titanium alloy billet (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 being pressurized.

Images