Titanium alloy blisk linear friction welding hot sizing tool and technological method

Abstract

The invention discloses a titanium alloy blisk linear friction welding hot sizing tool and a technological method. The tool comprises a base, a molded surface pressing block and an upper pressing plate. The base is provided with a positioning block; the inner side molded surfaces of the molded surface pressing blocks are fully matched with the sections of the blades 9-13, and the outer circumferences of the molded surface pressing blocks are aligned with the outer circumference of the base in the assembling state. The process method comprises: detecting the initial size of a blade; a tool is assembled after the contact surface is coated with a welding stop agent, and it is ensured that the outer circle of the molded surface pressing block is flush with the base; raising the temperature to 650 DEG C at the speed of 5 + / -2 DEG C / min in a vacuum furnace, preserving heat for 3 hours, cooling to 200 DEG C or below along with the furnace, and filling argon for cooling; and the blade size is measured again after dismounting. The tool is made of a stainless steel material with the linear expansion coefficient smaller than or equal to 10 * 10 / DEG C, and the problem that the pose of the zero-allowance linear friction welding blade is out of tolerance is solved through full-profile pressing and anti-channeling structural design in combination with the high-temperature creep effect.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing an aero-engine fan blade disk, and in particular to a titanium alloy blade disk linear friction welding thermal correction tool and a process method. Background Art

[0002] The blisk is a core component that enables structural innovation and technological advancements in the new generation of aircraft engines, and has become an essential structure for engines with a thrust-to-weight ratio of 10 or above. However, the use of high-performance metal materials such as titanium alloys and high-temperature alloys results in poor machinability. Furthermore, the blisk's thin, large webs, complex blade profiles, and nonlinear, narrow flow paths create extremely demanding manufacturing requirements. Therefore, the comprehensive manufacturing process technology for blisks has become a global challenge. Compared to other technologies, linear friction welding can produce high-performance, high-quality weld joints, offering unique advantages in blisk manufacturing technology. It enables efficient, low-cost, and highly reliable machining and repair of blisks, and is the only technical means to manufacture hollow blades and blisks made of dissimilar materials.

[0003] When welding linear friction welded integral blades, the blades and the disc body are subjected to very large welding pressure, with the maximum pressure reaching 30-40 tons. At the same time, the blade part is in a vibrating state during the welding process, and the welding tooling will also produce a certain deformation under the action of welding pressure. Therefore, under the influence of welding pressure and vibration, the position and torsion of the blade will deviate from the theoretical position after welding. Moreover, since the blade is in a zero-residue state, it cannot be corrected through subsequent machining processes. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a titanium alloy blisk linear friction welding thermal alignment tool and process method; the specific technical solution is as follows: A titanium alloy integral blade linear friction welding heat correction tool, comprising a base, a profile pressing block and an upper pressing plate; The base is provided with a positioning block along the circumference that matches the bottom of the blisk body. The positioning block is processed according to the blade profile and is used to position and carry the blisk; The number of the profile pressing blocks is consistent with the number of blades, and the inner profile of each profile pressing block is completely consistent with the blade body profile of the blade, and fits the blade profile during assembly; the outer profile of the profile pressing block is processed into a plane; The upper pressing plate covers the outer planes of all the profile pressing blocks, and the profile pressing blocks are located between the blade profile and the upper pressing plate, and the three apply vertical pressure through a pressure transmission mechanism; The outer circumference of the profile pressing block is aligned with the outer circumference of the base in the assembled state.

[0005] The preferred embodiment of the titanium alloy integral blade linear friction welding heat correction tool is that the base, the profile block and the upper pressure plate all adopt a linear expansion coefficient of ≤10×10⁻ 6 / ℃ stainless steel material.

[0006] The preferred embodiment of the titanium alloy integral blade linear friction welding thermal correction tool is that the blade body contact surface of the profile pressing block covers the entire profile area of ​​the blade sections 9-13.

[0007] The preferred embodiment of the titanium alloy integral blade disk linear friction welding thermal alignment tool is that the center of the positioning block of the base is coaxial with the center hole of the integral blade disk.

[0008] A process method for applying a titanium alloy integral blade linear friction welding heat correction tooling includes the following steps: Step 1: Dimensional inspection before heat treatment Detect the blade cross-section profile and the diameter of the blade tip overlap point; Step 2: Assemble the tooling Apply solder paste to the contact surfaces between the blisk and the tooling, and the contact surfaces between the tooling components; install the blisk on the base (on the positioning block); press the profile blocks onto the blade surface one by one, ensuring that the outer circle of the profile blocks is flush with the outer circle of the base; install the upper pressure plate so that the profile blocks fit tightly against the blade; Step 3: Heat treatment Place the assembly in a vacuum furnace, heat it to 650°C at a rate of 5±2°C / min, and hold it for 3 h. Cool it to below 200°C in the furnace and then cool it with argon gas. Step 4: Dimensional inspection after heat treatment Disassemble the tooling and remove the solder paste, then inspect the blade profile dimensions.

[0009] The preferred embodiment of the process method using a titanium alloy integral blade linear friction welding thermal correction tool is that in step 2, the solder stopper is a high-temperature inorganic coating with a coating thickness of 0.05-0.1 mm.

[0010] The preferred embodiment of the process method using a titanium alloy integral blade linear friction welding thermal correction tool is that in step three, three thermocouples are evenly distributed to monitor the temperatures of different parts of the tool and the integral blade.

[0011] The preferred embodiment of the process method using a titanium alloy integral blade linear friction welding heat correction tool is that in step 4, the solder stop on the surface of the integral blade is removed with anhydrous ethanol.

[0012] Compared with the prior art, the present invention has the following beneficial technical effects: This technical solution can achieve blade shape correction and post-weld heat treatment of titanium alloy linear friction welded integral blade disks through the design of reasonable titanium alloy linear friction welded integral blade disk heat treatment tooling and heat treatment process, solve the problem of out-of-tolerance blade position and torsion after friction welding, and finally meet the design requirements after the overall shape correction of the blade surface; improve the processing accuracy of parts and reduce processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the assembly of the blisk shaping fixture; Figure 2 Schematic diagram of the integral blade disk; Figure 3 Schematic diagram of the base structure; Figure 4 Schematic diagram of the profile block structure; Figure 5 Schematic diagram of the upper pressure plate structure.

[0014] In the figure: 1-base, 2-molding surface block, 3-upper pressure plate, 4-integral blade, 5-blade, 6-positioning block. DETAILED DESCRIPTION

[0015] The following is combined with Figure 1-5 The present invention is described in detail, but the protection scope of the present invention is not limited by the accompanying drawings.

[0016] A titanium alloy integral blade linear friction welding thermal correction tool, comprising a base 1, a profile pressing block 2 and an upper pressing plate 3; The base 1 is provided with a positioning block 6 along the circumference thereof, which matches the bottom of the blisk 4. The positioning block 6 is processed according to the blade profile and is used to position and carry the blisk; The number of the profile pressing blocks 2 is consistent with the number of blades, and the inner profile of each profile pressing block is completely consistent with the blade body profile of the blade 5, and fits the blade profile during assembly; the outer profile of the profile pressing block 2 is processed into a flat surface; The upper pressing plate 3 covers the outer surface of all the profile pressing blocks 2. The profile pressing blocks 2 are located between the blade profile and the upper pressing plate 3. The three apply vertical pressure through a pressure transmission mechanism. The outer circumference of the profile pressing block 2 is aligned with the outer circumference of the base 1 in the assembled state.

[0017] The base 1, the profile pressing block 2 and the upper pressing plate 3 all adopt a linear expansion coefficient of ≤10×10⁻ 6 / ℃ stainless steel material.

[0018] The blade contact surface of the profile pressing block 2 covers the entire profile area of ​​the cross section of the blades 9-13.

[0019] The center of the positioning block 6 of the base 1 is coaxial with the center hole of the integral blade disk 4.

[0020] A process method for applying a titanium alloy integral blade linear friction welding heat correction tooling includes the following steps: Step 1: Dimensional inspection before heat treatment Detect the blade cross-section profile and the diameter of the blade tip overlap point; Step 2: Assemble the tooling Apply solder paste to the contact surfaces between the blisk and the tooling, and the contact surfaces between the tooling components; install the blisk on the positioning block 6 of the base 1; press the profile pressing blocks 2 onto the blade surface one by one, ensuring that the outer circle of the profile pressing blocks 2 is flush with the outer circle of the base 1; install the upper pressing plate 3 so that the profile pressing blocks 2 and the blade 5 are tightly fitted; Step 3: Heat treatment The assembly was placed in a vacuum furnace, heated at 5°C / min to 650°C and held for 3 h, cooled to below 200°C in the furnace, and then cooled with argon gas. Step 4: Dimensional inspection after heat treatment Disassemble the tooling and remove the solder paste, then inspect the surface dimensions of blade 5.

[0021] In the step 2, the solder stopper is a high-temperature inorganic coating with a coating thickness of 0.08 mm.

[0022] In the step three, three thermocouples are evenly distributed to monitor the temperatures of different parts of the tooling and the integral blade disk 4 .

[0023] In the step 4, the solder stop on the surface of the blisk 4 is removed with anhydrous ethanol.

Claims

1. A titanium alloy blisk linear friction welding thermal alignment tool, characterized in that: It includes a base, a profile pressing block and an upper pressing plate; The base is provided with a positioning block along the circumference that matches the bottom of the blisk body. The positioning block is processed according to the blade profile and is used to position and carry the blisk; The number of the profile pressing blocks is consistent with the number of blades, and the inner profile of each profile pressing block is completely consistent with the blade body profile of the blade, and fits the blade profile during assembly; the outer profile of the profile pressing block is processed into a plane; The upper pressing plate covers the outer planes of all the profile pressing blocks, and the profile pressing blocks are located between the blade profile and the upper pressing plate, and the three apply vertical pressure through a pressure transmission mechanism; The outer circumference of the profile pressing block is aligned with the outer circumference of the base in the assembled state.

2. The titanium alloy blisk linear friction welding thermal alignment tool according to claim 1, characterized in that: The base, profile pressing block and upper pressing plate all adopt linear expansion coefficient ≤10×10⁻ 6 / ℃ stainless steel material.

3. The titanium alloy blisk linear friction welding thermal alignment tool according to claim 1, characterized in that: The blade body contact surface of the profile pressing block covers the entire profile area of ​​the blade 9-13 cross section.

4. The titanium alloy blisk linear friction welding thermal alignment tool according to claim 1, characterized in that: The center of the positioning block of the base is coaxial with the center hole of the integral blade disk.

5. The process method using a titanium alloy blisk linear friction welding thermal alignment tool according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Dimensional inspection before heat treatment; Detect the blade cross-section profile and the diameter of the blade tip overlap point; Step 2: Assemble tooling; Apply solder paste to the contact surfaces between the blisk and the tooling, and the contact surfaces between the tooling components; install the blisk on the base positioning block; press the profile blocks onto the blade surface one by one, ensuring that the outer circle of the profile blocks is flush with the outer circle of the base; install the upper pressure plate to ensure that the profile blocks fit tightly against the blade; Step 3: heat treatment; Place the assembly in a vacuum furnace, heat it to 650°C at a rate of 5±2°C / min, and hold it for 3 h. Cool it to below 200°C in the furnace and then cool it with argon gas. Step 4: Dimensional inspection after heat treatment; Disassemble the tooling and remove the solder paste, then inspect the blade profile dimensions.

6. The process method using a titanium alloy blisk linear friction welding thermal alignment tool according to claim 5, characterized in that: In the step 2, the solder stopper is a high-temperature inorganic coating with a coating thickness of 0.05-0.1 mm.

7. The process method using a titanium alloy blisk linear friction welding thermal alignment tool according to claim 5, characterized in that: In the step three, three thermocouples are evenly distributed to monitor the temperatures of different parts of the tooling and the integral blade disk.

8. The process method using a titanium alloy blisk linear friction welding thermal alignment tool according to claim 5, characterized in that: In the step 4, the solder stop on the surface of the integral blade disk is removed with anhydrous ethanol.

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