Titanium alloy curved surface structure heat treatment tool and heat treatment method

Abstract

The invention provides a titanium alloy curved surface structure heat treatment tool and a heat treatment method.The titanium alloy curved surface structure heat treatment tool comprises a heat treatment frame and a pre-tightening device, the pre-tightening device is used for fixing the heat treatment frame, the heat treatment frame comprises a plurality of main frames and a plurality of auxiliary frames, the main frames are connected in a crossed mode to form a curved surface frame, and the main frames are connected with the auxiliary frames; during heat treatment, the titanium alloy curved surface structure is located on the heat treatment frame. The heat treatment frame is formed by the multiple main frames and the multiple auxiliary frames, the heat treatment frame curved surface is consistent with the titanium alloy curved surface in structure, the heat treatment frame can increase the contact area between the heat treatment frame and the titanium alloy curved surface, and the situation that the contact area of a traditional supporting pier is small, and high stress concentration is formed on local curved surfaces is avoided; in order to solve the problems of easy deformation in the heat treatment process and large surface quality control difficulty in the prior art, the pre-tightening device is in contact with the heat treatment frame and provides supporting force to realize the pre-tightening function of the titanium alloy curved surface structure, and the heat treatment surface quality of the titanium alloy curved surface structure is further ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of titanium alloy structure preparation, in particular to a titanium alloy curved surface structure heat treatment tool and a heat treatment method. BACKGROUND

[0002] Titanium alloy spherical shell (or spherical head) is one of the typical structure forms of pressure vessels. At present, titanium alloy spherical shells with a diameter of more than 2m are usually manufactured by using the process of split stamping + assembly and welding. The curved surface structures such as petal and top circle are hot formed, and then the whole is welded to form a head. After the titanium alloy curved surface structure is formed, in order to improve the mechanical properties of the titanium alloy material, the curved surface structure needs to be heat treated. The traditional titanium alloy curved surface structure heat treatment adopts support piers for supporting and fixing (see the attached Figure 1 ), which has the following problems:

[0003] (1) With the increase of temperature, the strength of titanium alloy decreases significantly. The yield strength of titanium alloy at 600℃ is 1 / 2 of that at room temperature, and the yield strength of titanium alloy at 900℃ is only 1 / 30 of that at room temperature. When the support piers are used to support the titanium alloy structure for heat treatment, the distance between the support piers is generally large. The area of the titanium alloy structure which is not in contact with the support piers cannot be effectively supported. With the increase of temperature, this part of the area deforms plastically due to its own weight, which seriously affects the dimensional accuracy of the curved surface structure, and it is difficult to correct the shape.

[0004] (2) The traditional heat treatment support pier is in point contact with the titanium alloy curved surface structure, which is easy to cause surface defects such as indentation and pit on the surface of the titanium alloy, resulting in irreparable loss.

[0005] Therefore, the forming accuracy of the curved surface structures such as petal and top circle directly affects the assembly quality of the structure. Poor forming accuracy will lead to quality problems such as misalignment of the structure during welding, local stress concentration, etc., which will bring great risk to the safety and reliability of the structure in service.

[0006] The prior art with the publication number CN106734388B discloses a titanium alloy machine casing part heat treatment correction tool. The heat treatment correction tool includes an inner ring support, an outer ring support, a first radial plate support, a second radial plate support, a third radial plate support, an outer ring pressing plate assembly, an inner ring pressing cover plate and a first fastening stud. In use, the inner ring support, the inner ring pressing cover plate and the first fastening stud fix the inner ring of the titanium alloy machine casing part to be corrected which is installed on the inner ring support. The first radial plate support, the second radial plate support and the third radial plate support fix the radial plate of the titanium alloy machine casing part to be corrected. Each outer ring pressing plate assembly is installed on the outer ring support to fix the outer ring of the titanium alloy machine casing part to be corrected which is installed in the positioning groove of the outer ring support. The tool in the prior art can only be used for heat treatment of the titanium alloy machine casing part, and cannot be used for heat treatment of the titanium alloy curved surface structure. SUMMARY

[0007] Therefore, the present application aims to provide a titanium alloy curved surface structure heat treatment tooling and heat treatment method to solve the problem of deformation and difficulty in surface quality control in the prior art when heat treating large-sized titanium alloy curved surface structures.

[0008] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0009] A titanium alloy curved surface structure heat treatment tooling, comprising a heat treatment frame and a pre-tightening device, the pre-tightening device being used to fix the heat treatment frame, the heat treatment frame comprising a plurality of main frames and a plurality of auxiliary frames, the plurality of main frames being connected to form a curved surface frame, and the plurality of main frames being connected to the auxiliary frames, wherein the titanium alloy curved surface structure is located on the heat treatment frame during heat treatment.

[0010] The heat treatment frame is formed by the plurality of main frames and the plurality of auxiliary frames, the curved surface of the heat treatment frame is consistent with the titanium alloy curved surface structure, the heat treatment frame can increase the contact area between the two, avoid the point contact of the traditional support pier, the contact area is small, high stress concentration is formed in the local curved surface, and the problem of easy deformation and difficulty in surface quality control during heat treatment is solved, the pre-tightening device is in contact with the heat treatment frame and provides a supporting force to realize the pre-tightening function of the titanium alloy curved surface structure, and the surface quality of the titanium alloy curved surface structure during heat treatment is further ensured.

[0011] Further, the plurality of main frames are connected by bolts, and the main frames and the auxiliary frames are connected by bolts.

[0012] This arrangement improves the stability of the heat treatment frame and improves the heat treatment effect of the titanium alloy curved surface structure.

[0013] Further, the auxiliary frame comprises a plurality of annular auxiliary support frames.

[0014] Further, the distance between the annular auxiliary support frames should satisfy L1, L2, …, L n ≤ 500mm, wherein the levels of the annular auxiliary support frames from top to bottom are 1st, 2nd, …, nth, the distance between the 1st annular auxiliary support frame and the vertex of the main frame is L1, and the same applies to the other levels.

[0015] This arrangement performs heat treatment on the heat treatment tooling together with the titanium alloy curved surface structure, controls the distance between the main frame and the auxiliary frame, and ensures the forming precision and surface quality of the titanium alloy curved surface structure during heat treatment.

[0016] Further, the plurality of annular auxiliary support frames are arranged in parallel.

[0017] Further, the auxiliary frame further comprises a triangular auxiliary support frame, and the triangular auxiliary support frame is provided with a plurality of.

[0018] The arrangement improves the stability of the heat treatment frame and improves the heat treatment effect of the titanium alloy curved surface structure.

[0019] Further, the outer arc curvature r of the main frame is 框架 The curvature radius r of the titanium alloy curved surface structure is 曲面结构 Wherein, r 框架 =r 曲面结构 .

[0020] Further, the heat treatment frame is located on the bottom plate and between the two pre-tightening supports, and the fastener is used to fix the heat treatment frame.

[0021] The arrangement realizes the pre-tightening function of the titanium alloy curved surface structure by the pre-tightening device in contact with the heat treatment frame and providing a supporting force, and further ensures the surface quality of the titanium alloy curved surface structure after heat treatment.

[0022] Further, the pre-tightening device further comprises a reinforcing member, and the reinforcing member is arranged on the fastener.

[0023] Further, the reinforcing member is a pre-tightening gasket.

[0024] A titanium alloy curved surface structure heat treatment method adopts the titanium alloy curved surface structure heat treatment tooling as described above, and comprises the following steps:

[0025] Step one, design of the main frame in the heat treatment tooling;

[0026] Step two, design of the auxiliary frame in the heat treatment tooling;

[0027] Step three, installation of the pre-tightening device in the heat treatment tooling;

[0028] Step four, oxidation prevention treatment of the plate;

[0029] Step five, furnace loading;

[0030] Step six, heating;

[0031] Step seven, cooling;

[0032] Step eight, disassembly of the heat treatment pre-tightening device;

[0033] Step nine, precision detection.

[0034] Compared with the prior art, the titanium alloy curved surface structure heat treatment tooling and heat treatment method have the following advantages:

[0035] (1) The heat treatment tooling of the present application changes the contact mode of the heat treatment tooling with the titanium alloy curved surface structure from the traditional point contact to the surface contact, increases the contact area of the titanium alloy curved surface structure and the heat treatment tooling, ensures the precision of the titanium alloy curved surface structure, and will not cause damage to the heat treatment equipment and the surface of the titanium alloy curved surface structure;

[0036] (2) All frame structures in the heat treatment tooling of the present application can be disassembled and replaced, and have good universality;

[0037] (3) The heat treatment tooling of the present application adopts an arched frame structure, has good structural stability in a high temperature state, can be repeatedly used for many times, and greatly reduces the cost of the heat treatment tooling;

[0038] (4) The heat treatment tooling of the present application adopts a lightweight and low-cost frame combined structure, reasonably designs the frame spacing of the heat treatment tooling based on the curvature radius and arc length of the titanium alloy curved surface structure, realizes low-cost heat treatment of large-specification titanium alloy curved surface structures, and has good technical application and market prospect in the field of titanium alloy ocean engineering;

[0039] (5) The titanium alloy curved surface structure after heat treatment of the present application has mechanical properties of yield strength ≥ 250 MPa, tensile strength ≥ 370 MPa, and elongation ≥ 12%. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is a structure schematic diagram of the traditional pier of the present application for heat treatment of the titanium alloy curved surface structure;

[0041] Figure 2 It is a structure schematic diagram of the titanium alloy curved surface structure (top circle) of the present application arranged on the heat treatment tooling Figure 1 ;

[0042] Figure 3 It is a structure schematic diagram of the titanium alloy curved surface structure (melon piece) of the present application arranged on the heat treatment tooling Figure 2 ;

[0043] Figure 4 It is a schematic diagram of the heat treatment tooling frame of the present application;

[0044] Figure 5 It is a schematic diagram of the heat treatment tooling frame size design of the present application;

[0045] Figure 6 It is a schematic diagram of the pre-tightening device of the present application.

[0046] Explanation of reference signs:

[0047] 1 - heat treatment frame, 11 - main frame, 12 - auxiliary frame, 121 - annular auxiliary support frame, 122 - triangular auxiliary support frame, 2 - pre-tightening device, 21 - bottom plate, 22 - pre-tightening support, 23 - fastener, 24 - reinforcing piece, 25 - welding position. DETAILED DESCRIPTION

[0048] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0049] The present application is directed to a large-size titanium alloy curved surface structure with a thickness of 20 mm or more and a maximum arc length of 1000 mm or more, and proposes a titanium alloy curved surface structure heat treatment tooling, which comprises a heat treatment frame 1 and a pre-tightening device 2, the pre-tightening device 2 is used to fix the heat treatment frame 1, the heat treatment frame 1 comprises a plurality of main frames 11 and a plurality of auxiliary frames 12, the plurality of main frames 11 are connected to form a curved surface frame, and the plurality of main frames 11 are connected with the auxiliary frames 12 to form the heat treatment frame 1, and the titanium alloy curved surface structure is located on the heat treatment frame during heat treatment.

[0050] The setting forms a heat treatment frame through a plurality of main frames and a plurality of auxiliary frames, the curved surface of the heat treatment frame is consistent with the titanium alloy curved surface structure, the heat treatment frame can increase the contact area between the two, avoid the point contact or plane contact of the traditional support pier, the contact area is small, and high stress concentration is formed in the local curved surface, which is easy to deform and difficult to control the surface quality during the heat treatment process, the pre-tightening device is in contact with the heat treatment frame and provides a supporting force to realize the pre-tightening function of the titanium alloy curved surface structure, and the surface quality of the titanium alloy curved surface structure during heat treatment is further ensured.

[0051] Specifically, the size and arc length of the main frame need to be designed according to the size of the titanium alloy curved surface structure.

[0052] Specifically, the plurality of main frames are connected through bolts, and the main frame and the auxiliary frame are connected through bolts.

[0053] Specifically, the auxiliary frame 12 comprises an annular auxiliary support frame 121, and a plurality of annular auxiliary support frames are arranged. The number and connection position of the auxiliary support frames need to be designed according to the arc length of the main frame.

[0054] Specifically, the plurality of annular auxiliary support frames are arranged in parallel.

[0055] Specifically, the auxiliary frame 12 further comprises a triangular auxiliary support frame 122, and a plurality of triangular auxiliary support frames are arranged. The plurality of auxiliary support frames are connected between the two annular auxiliary support frames at the bottom of the main frame.

[0056] Specifically, the outer arc curvature r of the curved frame formed by the main frame 框架 , the curvature radius r of the titanium alloy curved structure 曲面结构 , wherein r 框架 =r 曲面结构 .

[0057] Specifically, the pre-tightening device 2 comprises a bottom plate 21, a pre-tightening support 22, and a fastener 23, the pre-tightening support is fixed on the bottom plate, the heat treatment frame is located on the bottom plate and between the two pre-tightening supports, and the fastener fixes the heat treatment frame.

[0058] Preferably, the pre-tightening support is welded on the bottom plate, such as the welding position 25 shown in the figure. Figure 6

[0059] Specifically, the pre-tightening device 2 further comprises a reinforcing piece 24, which is arranged on the fastener.

[0060] Preferably, the fastener 23 is a pre-tightening bolt.

[0061] Preferably, the reinforcing piece is a pre-tightening gasket, which has a threaded hole in the center to facilitate the insertion of the bolt.

[0062] The pre-tightening device specifically operates as follows: the pre-tightening gasket is placed in the groove of the pre-tightening support and is compressed by the pre-tightening bolt, the lower end of the pre-tightening bolt is in contact with the heat treatment frame and provides a supporting force to realize the pre-tightening function of the titanium alloy curved structure.

[0063] The application also provides a titanium alloy curved structure heat treatment method, which adopts the titanium alloy curved structure heat treatment tooling described above and comprises the following steps.

[0064] Step one, main frame design in the heat treatment tooling: according to the size design of the main frame of the heat treatment tooling for the titanium alloy curved structure, the curvature radius r of the titanium alloy curved structure 曲面结构 and the outer arc curvature r of the main frame of the heat treatment tooling 框架 satisfy formula (1), so as to ensure that the titanium alloy curved structure is well attached to the heat treatment tooling during the heat treatment process.

[0065] r 框架 =r 曲面结构 (1)

[0066] The maximum arc length L of the curved structure max and the arc length L of the main frame of the heat treatment tooling 框架 satisfy formula (2), so as to ensure that the titanium alloy curved structure is located above the heat treatment tooling as a whole during the heat treatment process.

[0067] L 框架 ≥L max (2) ​

[0068] Step two, the auxiliary frame design in the heat treatment tooling: the spacing of the auxiliary support frame should meet L1, L2, …, L n ≤500mm, the levels of the auxiliary support frame from top to bottom are 1st, 2nd, …, nth, the distance between the 1st auxiliary support frame and the vertex of the main frame is L1, the distance between the 2nd auxiliary support frame and the 1st auxiliary support frame is L2, and the naming method of the distance between the auxiliary frames of each level is similar. When the main frame spacing R 主框架 is the distance between the bottom of the main frame and the vertical axis, R 主框架 satisfies 500mm≤R 主框架 ≤1000mm, a 1st triangular auxiliary support should be arranged in the area surrounded by two adjacent main frames and two adjacent auxiliary frames, i.e., the triangular auxiliary support directly connects the opposite corners of the area, when the main frame spacing R 主框架 satisfies 1000mm≤R 主框架 ≤1500mm, a 2nd triangular auxiliary support should be arranged in the area surrounded by two adjacent main frames and two adjacent auxiliary frames, wherein the 2nd auxiliary support has two axisymmetric auxiliary frames in a quadrilateral frame, the 1st auxiliary support has only one auxiliary frame in a quadrilateral frame, the larger the main frame spacing, the closer to the bottom of the heat treatment tooling, and the arrangement method of the triangular auxiliary frame is similar.

[0069] Step three: install the heat treatment pre-tightening device: weld the heat treatment pre-tightening support on the corresponding position of the titanium alloy melon surface and the heat treatment frame, install the pre-tightening gasket and pre-tightening bolt on the heat treatment frame, and use tools to complete the pre-tightening.

[0070] Step four: plate oxidation prevention treatment: brush the oxidation prevention coating on the surface of the titanium alloy curved surface structure, the oxidation prevention coating is a conventional coating, which is not described in detail, brush 2-3 times, and each coating is naturally dried before brushing the next coating.

[0071] Step five: furnace loading: use an electric heating furnace or a natural gas heating furnace, place the heat treatment tooling in the center of the effective heating area of the furnace hearth to ensure uniform heating of the curved surface structure, place the plate in the heat treatment tooling according to step three, and align the center of gravity of the plate with the vertex of the heat treatment tooling. Place the thermocouple on the plate to detect the temperature in real time.

[0072] Step six: heating: use furnace heating or temperature heating, and set the heat treatment process parameters such as heating temperature, heating speed, and holding time according to needs.

[0073] Step 7: Cooling: Cool the titanium alloy curved surface structure according to the process requirements. To avoid deformation of the titanium alloy curved surface structure due to thermal stress during the cooling process, the surface cooling rate of the titanium alloy curved surface structure should meet the requirement T_cooling ≤ 150℃ / min.

[0074] Step 8: Disassembly of the heat treatment pre-tightening device: After cooling to room temperature, use tools to remove the pre-tightening bolts and pre-tightening washers, and then use an angle grinder to remove the welded parts between the pre-tightening bracket and the titanium alloy structural parts to complete the disassembly.

[0075] Step 9, Precision Inspection: Use a three-dimensional template (with the same radius of curvature as the curved surface structure) that matches the design dimensions of the curved surface structure to inspect the gaps in the inner arc surface of the curved surface structure.

[0076] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.

[0077] Example 1

[0078] This embodiment provides a heat treatment method for titanium alloy curved surface structures, including the following steps:

[0079] 1. For the top circle of a titanium alloy curved surface structure with a thickness of 25mm, a maximum arc length of 2000mm, and a curvature radius of 1400mm, a heat treatment fixture with a curvature radius of 2700mm, a base diameter of 2458mm, and a height of 406mm is designed. The main frame arc length is selected as 1500mm, and the titanium alloy grade is TA2.

[0080] 2. Based on the arc length calculation of the main frame in step 1), and considering that the spacing of the circumferential auxiliary support frames L1, 2, ..., n ≤ 500mm, select to set 3 layers of circumferential auxiliary support frames. Since the maximum spacing R of the main frame at the bottom circumferential auxiliary support frame... 框架 =965.3mm>500mm, a first-level triangular auxiliary frame needs to be set between the second-level circumferential auxiliary support frame and the third-level circumferential auxiliary support frame.

[0081] 3. Based on the dimensions of the heat treatment frame designed in steps 1) and 2), process and assemble the heat treatment frame.

[0082] 4. Weld the heat treatment pre-tightening bracket to the corresponding position of the titanium alloy melon petal surface and the heat treatment frame as described in step 1), install the pre-tightening shim and pre-tightening bolt onto the heat treatment frame, and use tools to complete the pre-tightening.

[0083] 5. Apply an anti-oxidation coating to the top circular surface of the titanium alloy described in step 1). Apply two coats, allowing each coat to dry naturally before applying the next coat.

[0084] 6. Using an electric heating furnace, placing the heat treatment tooling described in step 3) in the center of the effective heating area of the furnace to ensure uniform heating of the titanium alloy top circle in step 4), aligning the center of gravity of the titanium alloy top circle with the upper vertex of the support, and placing a thermocouple on the top circle to detect the temperature in real time during the heat treatment process.

[0085] 7. Using furnace heating, setting the heating temperature to 550℃, the heating rate to 300℃ / h, and the holding time to 40min, and heating the titanium alloy top circle and the heat treatment tooling treated in step 5) together for heat treatment.

[0086] 8. Taking out the titanium alloy top circle treated in step 6) for air cooling, Tcooling=100℃ / min.

[0087] 9. After cooling to room temperature, using tools to remove the pre-tightening bolts and pre-tightening washers described in step 4), and then using an angle grinder to remove the welded parts of the pre-tightening support and the titanium alloy structure in step 4), completing the disassembly.

[0088] 10. Using a three-dimensional template with a curvature radius of 2700mm to detect the inner arc gap of the titanium alloy top circle treated in step 7).

[0089] The mechanical properties of the titanium alloy curved surface structure after heat treatment are: yield strength 280MPa, tensile strength 410MPa, and elongation 13%.

[0090] Example 2

[0091] The present embodiment provides a titanium alloy curved surface structure heat treatment method, comprising the following steps:

[0092] 1. For a titanium alloy melon piece with a thickness of 30mm, a maximum arc length of 1600mm, and a curvature radius of 1500mm, a heat treatment tooling with a curvature radius of 1500mm, a bottom diameter of 1855.1mm, and a height of 321.2mm is designed, the arc length of the main frame is selected to be 1000mm, and the titanium alloy grade is TC4.

[0093] 2. According to the arc length calculation of the main frame in step 1), 2 layers of circumferential auxiliary support frames are selected and set according to the circumferential auxiliary support frame spacing L1, 2, …, n≤500mm, and since the maximum spacing R3=728mm of the main frame at the bottom circumferential auxiliary support frame is greater than 500mm, a level 1 triangular auxiliary frame needs to be set.

[0094] 3. According to the heat treatment frame size designed in steps 1) and 2), the heat treatment frame is processed and assembled.

[0095] 4. Weld the heat treatment pre-tightening bracket to the corresponding position of the titanium alloy melon petal surface and the heat treatment frame as described in step 1), install the pre-tightening shim and pre-tightening bolt onto the heat treatment frame, and use tools to complete the pre-tightening.

[0096] 5. Apply anti-oxidation coating to the surface of the titanium alloy melon petals and pre-tightening fixture described in step 4). Apply three coats of coating, allowing each coat to dry naturally before applying the next coat.

[0097] 6. Use an electric heating furnace and place the heat treatment fixture described in step 3) in the center of the effective heating zone of the furnace to ensure that the titanium alloy petals are heated evenly in step 4), and that the center of gravity of the titanium alloy petals is aligned with the apex of the support. During the heat treatment process, place thermocouples on the petals to monitor the temperature in real time.

[0098] 7. Use furnace heating, set the heating temperature to 810℃, the heating rate to 400℃ / h, and the holding time to 65min, and heat the titanium alloy melon petals treated in step 5) together with the heat treatment fixture for heat treatment.

[0099] 8. Take out the titanium alloy melon petals processed in step 6) and air cool them at T_cooling = 100℃ / min.

[0100] 9. After cooling to room temperature, use tools to remove the pre-tightening bolts and pre-tightening washers described in step 4), and then use an angle grinder to remove the welded parts between the pre-tightening bracket and the titanium alloy structural component described in step 4) to complete the disassembly.

[0101] 10. Use a three-dimensional template with a curvature radius of 1500mm to test the gap between the inner arc surfaces of the titanium alloy melon petals after the processing in step 7).

[0102] The heat-treated titanium alloy curved surface structure has the following mechanical properties: yield strength of 910 MPa, tensile strength of 970 MPa, and elongation of 13%.

[0103] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A titanium alloy curved structure heat treatment tooling, characterized in that, The application relates to a heat treatment frame (1) and a pre-tightening device (2) for fixing the heat treatment frame (1), wherein the heat treatment frame (1) comprises a plurality of main frames (11) and a plurality of auxiliary frames (12), the plurality of main frames (11) are connected to form a curved frame, and the plurality of main frames (11) are connected with the auxiliary frames (12), and the titanium alloy curved structure is located on the heat treatment frame (1) during heat treatment.

2. The tooling of claim 1, wherein, The plurality of main frames (11) are connected through bolts, and the main frames (11) and the auxiliary frames (12) are connected through bolts.

3. The titanium alloy curved structure heat treatment fixture of claim 1, wherein, The auxiliary frame (12) comprises a plurality of annular auxiliary support frames (121).

4. The titanium alloy curved structure heat treatment fixture of claim 3, wherein, The plurality of annular auxiliary support frames (121) are arranged in parallel.

5. The titanium alloy curved structure heat treatment fixture of claim 3, wherein, The auxiliary frame (12) further comprises a plurality of triangular auxiliary support frames (122).

6. The titanium alloy curved structure heat treatment fixture of claim 1, wherein, The outer arc curvature r formed by the main frame 框架 The curvature radius r of the titanium alloy curved surface structure 曲面结构 Wherein, r 框架 =r 曲面结构 .

7. The titanium alloy curved structure heat treatment fixture of claim 1, wherein, The pre-tightening device (2) comprises a bottom plate (21), a pre-tightening support (22) and a fastener (23), the pre-tightening support (22) is fixed on the bottom plate (21), the heat treatment frame (1) is located on the bottom plate and between the two pre-tightening supports (22), and the fastener (23) is used for fixing the heat treatment frame (1).

8. The titanium alloy curved structure heat treatment fixture of claim 1, wherein, The pre-tightening device (2) further comprises a reinforcing piece (24), and the reinforcing piece (24) is arranged on the fastener (23).

9. The titanium alloy curved structure heat treatment fixture of claim 8, wherein, The reinforcing piece is a pre-tightening gasket.

10. A heat treatment method for a titanium alloy curved surface structure, characterized in that, The application further discloses a heat treatment process of the titanium alloy curved structure, and the process comprises the following steps: Step one, main frame design in the heat treatment process; Step two, auxiliary frame design in the heat treatment process; Step three, pre-tightening device installation in the heat treatment process; Step four, plate anti-oxidation treatment; Step five, furnace loading; Step six, heating; Step seven, cooling; Step eight, pre-tightening device dismounting; Step nine, precision detection.

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