Titanium alloy blisk linear friction welding heat correction tooling and process method

Abstract

The application discloses a titanium alloy integral blade linear friction welding heat correction tool and a process method. The tool comprises a base, a profile pressing block and an upper pressing plate; the base is provided with a positioning block; the inner profile of the profile pressing block is fully matched with the cross section of the blade 9-13, and the outer circumference of the profile pressing block is aligned with the outer circumference of the base in the assembled state. The process method comprises the following steps: detecting the initial size of the blade; assembling the tool after coating the contact surface with a stop solder, and ensuring that the outer circle of the profile pressing block is flush with the base; heating to 650 DEG C at 5 DEG C / min in a vacuum furnace, keeping for 3 hours, cooling to below 200 DEG C with argon, and re-measuring the size of the blade after disassembly. The tool of the application adopts stainless steel material with a linear expansion coefficient of less than or equal to 10*10-6 / DEG C, solves the pose out-of-tolerance problem of the no-margin linear friction welding blade through full-profile pressing and anti-channeling structure design, and combines the high-temperature creep effect.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of manufacturing of aero-engine fan blisk, in particular to a titanium alloy blisk linear friction welding heat correction tool and process method. BACKGROUND

[0002] The blisk is a core component for realizing structural innovation and technical leap of a new generation of aero-engines, and has become a necessary structure of an engine with a thrust-to-weight ratio of 10 and above. However, the blisk is made of high-performance metal materials such as titanium alloy and high-temperature alloy, which leads to poor machinability, and the blisk has the structural characteristics of thin and large radial plate, complex blade shape, narrow and nonlinear flow channel, etc., which leads to extremely high manufacturing technology requirements, so the comprehensive manufacturing process technology of the blisk has become a worldwide problem. Compared with other technologies, linear friction welding can obtain high-performance and high-quality welded joints, has unique advantages in the manufacturing technology of the blisk, can realize high-efficiency, low-cost and high-reliability machining and repair of the blisk, and is the only technical means for realizing the manufacturing of hollow blades and blisks made of different materials.

[0003] When the linear friction welding blisk is welded, the blade and the disc body are subjected to very large welding pressure, and the maximum pressure can reach 30-40 tons. At the same time, the blade is in a vibrating state during the welding process, and the welding tool will also deform under the action of the welding pressure. Therefore, under the influence of the welding pressure and vibration, the position and twist of the blade deviate from the theoretical position after welding. Moreover, since the blade is in a no-stock state, it cannot be corrected through subsequent machining processes. SUMMARY

[0004] To solve the above technical problems, the application provides a titanium alloy blisk linear friction welding heat correction tool and process method, and the specific technical solutions are as follows:

[0005] A titanium alloy blisk linear friction welding heat correction tool, comprising a base, a profile pressing block and an upper pressing plate.

[0006] The base is provided with a positioning profile block matched with the bottom of the disc body of the blisk along the circumference, and the positioning profile block is processed according to the blade profile and used for positioning and bearing the blisk.

[0007] The number of the profile pressing blocks is consistent with the number of the blades, the inner profile of each profile pressing block completely matches the blade body profile, and the profile pressing blocks are assembled to match the blade profile; and the outer profile of the profile pressing block is processed as a plane.

[0008] The upper pressing plate covers the outer plane of all the profile pressing blocks, the profile pressing blocks are located between the blade profile and the upper pressing plate, and vertical pressure is applied to the three through a pressure transmission mechanism.

[0009] The outer circumference of the profiled block is aligned with the outer circumference of the base in the assembled state.

[0010] The linear expansion coefficient of the base, the profiled block and the upper pressing plate is less than or equal to 10*10-6 / ℃. 6 / ℃.

[0011] The leaf body contact surface of the profiled block covers all profiled areas of the blade 9-13 sections.

[0012] The center of the positioning block of the base is coaxial with the center hole of the integral blade.

[0013] The process method of the linear friction welding heat shaping tool for the titanium alloy integral blade comprises the following steps:

[0014] Step one: size detection before heat treatment

[0015] The blade section profile and the tip stacking point diameter size are detected.

[0016] Step two: assemble the tool

[0017] The welding inhibitor is coated on the contact surface of the integral blade and the tool and the contact surface of each component of the tool; the integral blade is installed on the base (the positioning block); the profiled blocks are pressed on the blade surface one by one to ensure that the outer circle of the profiled block is flush with the outer circle of the base; the upper pressing plate is installed to make the profiled block tightly adhere to the blade.

[0018] Step three: heat treatment

[0019] The assembled body is placed in a vacuum furnace, heated to 650℃ at a rate of 5±2℃ / min and kept for 3 hours, then cooled to below 200℃ and cooled by argon filling;

[0020] Step four: size detection after heat treatment

[0021] The tool is disassembled and the welding inhibitor is removed, and the blade profile size is detected.

[0022] In the process method of the linear friction welding heat shaping tool for the titanium alloy integral blade, the welding inhibitor in step two is a high-temperature inorganic coating with a coating thickness of 0.05-0.1 mm.

[0023] In the process method of the linear friction welding heat shaping tool for the titanium alloy integral blade, three thermocouples are used to monitor the temperature of different parts of the tool and the integral blade in step three.

[0024] The preferred scheme of the process method of the titanium alloy blisk linear friction welding heat correction tooling is that, in step four, the non-water ethanol is used to clean the surface of the blisk.

[0025] Compared with the prior art, the application has the following beneficial technical effects:

[0026] The titanium alloy linear friction welding blisk heat treatment tooling and heat treatment process are designed reasonably, the blade type correction and post-welding heat treatment of the titanium alloy linear friction welding blisk can be realized, the problems of the out-of-tolerance of the blade position and torsion after the friction welding are solved, the overall correction of the blade profile finally meets the design requirements, the machining precision of the part is improved, and the machining cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a blisk correction tooling assembly schematic diagram;

[0028] Figure 2 It is a blisk schematic diagram;

[0029] Figure 3 It is a base structure schematic diagram;

[0030] Figure 4 It is a profile pressing block structure schematic diagram;

[0031] Figure 5 It is an upper pressing plate structure schematic diagram.

[0032] In the figure, 1 is a base, 2 is a profile pressing block, 3 is an upper pressing plate, 4 is a blisk, 5 is a blade, and 6 is a positioning profile block. DETAILED DESCRIPTION

[0033] The application will be described in detail below with reference to the accompanying drawings. Figures 1-5 The protection scope of the application is not limited by the accompanying drawings.

[0034] A titanium alloy blisk linear friction welding heat correction tooling comprises a base 1, a profile pressing block 2 and an upper pressing plate 3.

[0035] The base 1 is provided with a positioning profile block 6 matched with the bottom of the blisk 4 along the circumference, the positioning profile block 6 is processed according to the blade profile, and is used for positioning and bearing the blisk;

[0036] The number of the profile pressing blocks 2 is consistent with the number of the blades, the inner profile of each profile pressing block is completely consistent with the blade body profile of the blade 5, and is matched with the blade profile during assembly; and the outer profile of the profile pressing block 2 is processed as a plane.

[0037] The upper pressing plate 3 covers the outer side plane of all profiled blocks 2 between the blade profile and the upper pressing plate 3, and vertical pressure is applied by a pressure transmission mechanism;

[0038] The outer circumference of the profiled block 2 is aligned with the outer circumference of the base 1 in the assembled state.

[0039] The base 1, profiled block 2, and upper pressing plate 3 are made of stainless steel material with a linear expansion coefficient ≤10×10⁻ 6 / ℃.

[0040] The blade body contact surface of the profiled block 2 covers the entire profile area of the blade 9-13 section.

[0041] The center of the positioning block 6 of the base 1 is coaxial with the center hole of the integral blade disc 4.

[0042] The process method of applying a linear friction welding heat shaping tool for a titanium alloy integral blade disc includes the following steps:

[0043] Step one: size detection before heat treatment

[0044] Detect the blade section profile and the blade tip stacking point diameter size;

[0045] Step two: assemble the tool

[0046] Apply a soldering inhibitor to the contact surface of the integral blade disc and the tool, and the contact surface of each component of the tool; install the integral blade disc on the positioning block 6 of the base 1; press the profiled blocks 2 one by one on the blade surface to ensure that the outer circle of the profiled blocks 2 is flush with the outer circle of the base 1; install the upper pressing plate 3 to make the profiled blocks 2 tightly fit the blade 5;

[0047] Step three: heat treatment

[0048] Put the assembled body into a vacuum furnace, heat up to 650℃ at a rate of 5℃ / min, keep for 3h, then cool down to below 200℃ and fill with argon gas;

[0049] Step four: size detection after heat treatment

[0050] Remove the tool and clean the soldering inhibitor, and detect the profile size of the blade 5.

[0051] In the step two, the soldering inhibitor is a high-temperature inorganic coating with a coating thickness of 0.08mm.

[0052] In the step three, three thermocouples are used to monitor the temperature of different parts of the tool and the integral blade disc 4.

[0053] In the step four, anhydrous ethanol is used to remove the soldering inhibitor on the surface of the integral blade disc 4.

Claims

1. A linear friction welding hot trim tooling for a titanium alloy blisk, characterized by, The base, the profiled block and the upper pressing plate are included. The base is provided with positioning blocks matching the bottom of the disk body along the circumference, and the positioning blocks are machined according to the blade profile for positioning and bearing the integral blade disk. The number of the profiled blocks is consistent with the number of the blades, the inner profile of each profiled block is completely consistent with the blade profile, and the profiled blocks are assembled to match the blade profile; the outer profile of the profiled block is machined as a plane. The upper pressing plate covers the outer plane of all profiled blocks, the profiled blocks are located between the blade profile and the upper pressing plate, and vertical pressure is applied through a pressure transmission mechanism. The outer circumference of the profiled block is aligned with the outer circumference of the base in the assembled state.

2. The linear friction welding hot-shaping tooling for a titanium alloy blisk of claim 1, wherein: The base, the profiled briquet, and the upper pressing plate are made of stainless steel material with linear expansion coefficient ≤10×10⁻ 6 / ℃.

3. The linear friction welding hot-shaping tooling for a titanium alloy blisk of claim 1, wherein: The blade body contact surface of the profiled block covers the entire profile area of the blade 9-13 section.

4. The linear friction welding hot trim fixture for a titanium alloy blisk of claim 1, wherein: The center of the positioning block of the base is coaxial with the center hole of the integral blade disk.

5. The process of using a linear friction welding heat straightening tooling for a titanium alloy blisk according to any one of claims 1-4, characterized in that: The steps include: Step one: size detection before heat treatment; Detect the blade section profile and the blade tip stacking point diameter size; Step two: assembly tooling; Apply a flux to the contact surface of the integral blade disk and the tooling and the contact surface of each component of the tooling; install the integral blade disk on the positioning block of the base; press the profiled blocks one by one on the blade surface to ensure that the outer circle of the profiled block is flush with the outer circle of the base; install the upper pressing plate to make the profiled blocks tightly fit the blades; Step three: heat treatment; Put the assembly into a vacuum furnace, heat up to 650℃ at a rate of 5±2℃ / min, keep for 3h, cool down to below 200℃ in the furnace, and then cool down by filling argon; Step four: size detection after heat treatment; Disassemble the tooling and remove the flux, and detect the blade profile size.

6. The process of claim 5, wherein the titanium alloy blisk linear friction welding hot trim process is characterized by: In step two, the flux is a high-temperature inorganic coating with a coating thickness of 0.05-0.1mm.

7. The process of claim 5, wherein the titanium alloy blisk linear friction welding hot trim process is characterized by: In step three, three thermocouples are used to monitor the temperature of different parts of the tooling and the integral blade disk.

8. The process of claim 5, wherein the titanium alloy blisk linear friction welding hot trim process is characterized by: In step four, anhydrous ethanol is used to remove the flux on the surface of the integral blade disk.

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