Water-cooling integrated cladding head based on titanium alloy blade repair

Abstract

The invention relates to the technical field of laser remanufacturing and repairing, and discloses a water-cooling integrated cladding head based on titanium alloy blade repairing, the water-cooling integrated cladding head comprises a cladding head body, and a powder feeding channel and a laser channel which are arranged in the cladding head body, and the powder feeding channel is communicated with the laser channel. A water cooling channel is further formed in the cladding head body, and the water cooling channel is provided with an inlet and an outlet and used for water circulation; a clamping cooling head is arranged below the cladding head body, a clamping channel is formed in the middle of the clamping cooling head, and the clamping cooling head communicates with the water cooling channel; during repairing, the two sides of the clamping channel clamping the cooling head advance in the mode of being attached to the blade, heat generated during repairing is taken away, and generated local high temperature is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of laser remanufacturing and repair, and in particular to a water-cooled integrated cladding head based on titanium alloy blade repair. Background Art

[0002] Titanium alloy blades play an extremely important role in aircraft engines. They are usually subjected to extreme working conditions, such as high-speed rotation, high temperature and high-pressure gas impact. These conditions easily lead to damage to the blades, such as wear, cracks, ablation and corrosion. Since titanium alloy blades are expensive to manufacture and have a direct impact on engine performance, effective repair of damaged blades can not only extend the service life of the blades and reduce maintenance costs, but also improve the reliability and economy of aircraft engines.

[0003] For this problem, it is of great practical significance to carry out research on the repair technology of titanium alloy blades. Repair technology can not only extend the service life of blades and reduce manufacturing costs, but also help improve the reliability and economy of aircraft engines. At present, the repair methods of titanium alloy blades mainly include advanced technologies such as laser melting deposition, argon arc welding, and linear friction welding. Although these methods can achieve the optimization of microstructure and the restoration of mechanical properties in the repair area to a certain extent by controlling the welding process and parameters, they are prone to defects such as warping, undercutting, and cracks. Therefore, a new repair method is needed.

[0004] When repairing titanium alloy blades, due to the small thickness and geometric dimensions of the blades, the following situations may occur during the repair process:

[0005] Substrate deformation: Due to the concentrated heat input during the laser additive repair process, thin-walled parts may deform due to thermal expansion and uneven cooling.

[0006] Heat-affected zone: Laser processing creates a heat-affected zone on the base material, which may affect the material's microstructure and properties.

[0007] The bonding problem between the coating and the substrate: It is necessary to ensure good metallurgical bonding between the cladding layer and the substrate to avoid peeling or cracks.

[0008] Uneven surface: During the cladding deposition process, surface fluctuations may occur, resulting in an uneven surface.

[0009] The above problems undoubtedly limit the difficulty of blade repair, so a new repair method is needed to solve this problem; therefore, the present invention proposes a water-cooled integrated cladding head specially used for repairing titanium alloy. Summary of the invention

[0010] In order to solve the problems of blade deformation, bonding strength between the cladding layer and the blade, ablation, cracks and the like that may occur in the titanium alloy blade during the repair process, the present invention proposes an integrated cladding head for water cooling the blade during the repair process.

[0011] The technical solution of the present invention is as follows:

[0012] A water-cooled integrated cladding head for repairing titanium alloy blades comprises a cladding head body and a powder feeding channel and a laser channel arranged inside the cladding head body, wherein the powder feeding channel and the laser channel are connected.

[0013] The cladding head body also has a water cooling channel inside, and the water cooling channel is provided with an inlet and an outlet for water circulation.

[0014] A clamping cooling head is provided below the cladding head body, a clamping channel is provided in the middle of the clamping cooling head, and the clamping cooling head is connected to the water cooling channel; during repair, the clamping channel of the clamping cooling head moves along the blades on both sides, taking away the heat generated during repair and reducing the local high temperature generated.

[0015] Furthermore, the clamping cooling head includes a water cooling plate, a clamping plate A and a clamping plate B. The clamping plate A and the clamping plate B are both hollow structures. The clamping plate A and the clamping plate B are relatively arranged at the bottom of the water cooling plate, and a clamping channel is formed between the clamping plate A and the clamping plate B.

[0016] Furthermore, the water cooling plate is provided with a water inlet A and a water outlet A on one side of the splint A, the water inlet A and the water outlet A are respectively connected to the splint A, and a partition is provided between the water inlet A and the water outlet A; the water cooling plate is provided with a water inlet B and a water outlet B on one side of the splint B, the water inlet B and the water outlet B are respectively connected to the splint B, and a partition is provided between the water inlet B and the water outlet B; the water outlet A is connected to the water inlet B, and a partition is provided between the water outlet B and the water inlet A.

[0017] Furthermore, the inner sides of the splint A and the splint B are respectively inlaid with graphite to form a copper-inlaid graphite structure.

[0018] Furthermore, the clamping cooling head and the cladding head body are connected by groove matching (a form of movable connection), so that the clamping cooling head rotates and changes the clamping direction according to the deviation of the repair path.

[0019] Furthermore, the cladding head body and the clamping cooling head are both made of brass.

[0020] Furthermore, the cladding head body and the clamping cooling head are formed by 3D printing.

[0021] A working process of a water-cooled integrated cladding head based on titanium alloy blade repair includes the following steps:

[0022] When the laser shines down from above, the powder and the laser are coupled in the laser channel, and the water flows into the clamping cooling head along the cooling channel. The water inlet A is connected to the entrance of the water cooling channel. The water flows into the clamping plate A from the water inlet A, flows out from the water outlet A, and enters the water inlet B, then enters the clamping plate B from the water inlet B, and flows out from the water outlet B into the outlet of the water cooling channel, forming a water cooling cycle to ensure that the temperature of the blade is lowered during repair.

[0023] Beneficial effects of the present invention:

[0024] 1) When repairing a blade, circulating cooling water is passed through the two hollow copper clamps located at the bottom. The clamps are attached to the blades, and the good thermal conductivity of copper takes away a large amount of heat generated during the repair process.

[0025] 2) The repair of the blade includes the movement of the copper splint. In order to reduce the friction during the movement, several copper-inlaid graphite are installed on the copper splint. Since the texture of graphite is relatively soft, it can act as a lubricant.

[0026] 3) Considering that the blade repair process may have path changes, a groove is used at the top of the copper clamp where it connects to the cladding head. The purpose of this design is to allow the copper clamp to rotate around the cladding head at a certain angle. In this way, even if the path changes, the clamp can still be close to the blade to cool it. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the integrated cladding head for titanium alloy blade repair according to the present invention;

[0028] Figure 2 It is a schematic front view of the water circulation direction inside the cladding head of the present invention;

[0029] Figure 3 It is a schematic side view of the water circulation direction inside the cladding head of the present invention;

[0030] Figure 4 It is a front view of the integrated cladding head based on titanium alloy blade repair of the present invention;

[0031] Figure 5 It is a right view of the integrated cladding head for repairing titanium alloy blades according to the present invention;

[0032] Figure 6 It is an AA cross-sectional view of the water-cooled integrated cladding head based on titanium alloy blade repair of the present invention;

[0033] Figure 7It is a schematic diagram of the internal structure of the clamping cooling head of the present invention;

[0034] Figure 8 A top view of a water-cooled integrated cladding head for titanium alloy blade repair according to the present invention;

[0035] Fig. 9 It is a cross-sectional view BB of the water-cooled integrated cladding head based on titanium alloy blade repair of the present invention;

[0036] Fig.10 This is a front view of a blade repaired by a water-cooled integrated cladding head based on titanium alloy blade repair of the present invention;

[0037] Fig.11 It is a right view of a blade repaired by a water-cooled integrated cladding head based on titanium alloy blade repair of the present invention;

[0038] Fig.12 This is an axonometric diagram of a blade repaired by a water-cooled integrated cladding head based on titanium alloy blade repair of the present invention;

[0039] Fig.13 It is a comparison diagram before and after the repair of the present invention;

[0040] Fig.14 A comparison diagram of the repair effect of the present invention and the repair effect of the prior art;

[0041] In the figure: 1-graphite; 2-clamping cooling head; 201-water cooling plate; 202-clamping plate A; 203-clamping plate B; 3-water cooling channel; 4-powder feeding pipeline; 5-laser channel; 6-water inlet A; 7-water outlet A; 8-partition; 9-water inlet B; 10-water outlet B. DETAILED DESCRIPTION

[0042] The present invention will be further described below in conjunction with the accompanying drawings.

[0043] like Figure 1-9 As shown, a water-cooled integrated cladding head based on titanium alloy blade repair includes: graphite 1, a clamping cooling head 2, a water cooling channel 3, a powder channel 4, a laser channel 5, a water inlet 6, a water outlet 7, and a baffle 8;

[0044] Graphite 1, as a solid lubricant, forms a lubricating layer on the surface or inside of the splint, reducing direct friction between the blade and the splint and reducing wear. Secondly, it has good high temperature resistance and can always maintain good lubrication effect in the high temperature environment generated during the repair process. In addition, the lubricating effect of graphite can also reduce the noise generated by the blade and the copper splint during the repair, making the entire repair process run more smoothly.

[0045] The clamping cooling head 2 includes a water cooling plate 201, a clamp A202 and a clamp B203. The clamp is made of brass. Since copper has good thermal conductivity and the inside of the clamp is a hollow structure with a water cooling channel 3, it can take away a large amount of heat during the repair process and keep the temperature of the blade from being too high to cause deformation and other problems.

[0046] Water cooling channel 3 During the laser additive repair process, the cladding head will generate a lot of heat. The water cooling channel can effectively take away the heat and prevent the cladding head from overheating, thereby protecting the cladding head and extending its service life, which helps to improve the stability of the repair process and the quality of the repaired part; through effective cooling, the cladding head can be restored to the working state in a shorter time, improving the repair efficiency; the water cooling channel helps to reduce the adhesion of powder to the nozzle or other parts of the cladding head during the additive repair process, and keep the cladding process smooth.

[0047] The powder channel 4 accurately transports the powder material to the outlet of the cladding head, ensuring that the powder and the laser beam reach the blade surface synchronously to form a uniform repair layer; the design of the powder channel 4 ensures the precise coupling of the powder flow and the laser beam in space to achieve efficient melting of the powder and uniform formation of the repair layer.

[0048] Laser channel 5 is responsible for transmitting the high-energy laser beam generated by the laser to the outlet of the cladding head, ensuring that the laser energy can accurately act on the blade and powder material.

[0049] The water inlet 6 smoothly introduces the cooling water into the clamping plate to form a circulation.

[0050] The water outlet 7 is used to introduce cooling water into the clamping plate on the other side and let the cooling water flow out of the cladding head to form a circulation.

[0051] The function of the partition plate 8 is to prevent the cooling water from flowing into the water outlet when entering the water inlet from above, and to separate the two outlets to prevent convection interference.

[0052] like Figure 1 As shown, the laser is emitted from the laser channel, the metal powder is coupled to the laser, and then the repair work is performed. Figure 2 Yes Figure 1 A partial enlarged view of the water-cooling part below. The water-cooling channels on both sides of the laser channel are connected to the brass clamp below. The top of the brass clamp is connected to the nozzle through a groove, so that the clamp can rotate at a certain angle around the nozzle.

[0053] When the laser enters the middle laser channel and couples with the powder, the blade is then repaired by additive. In order to avoid melting collapse, ablation, and cracking during the repair process due to the thinness of the titanium alloy blade, two brass splints are installed on both sides below the cladding head. During the repair process, the two brass splints are attached to the blade by the copper-inlaid graphite layer. At the same time, the inside of the splint is a hollow structure, connected to the water cooling channel above the cladding head, so that the cooling water flows into the splint. The water circulation path is as shown in the attached figure. Figure 2 and attached Figure 3 As shown in the figure, the cooling water enters the brass clamp from the upper water inlet. When the cooling water flows to the groove, since this is a hollow structure, the cooling water flows out from the water outlet and flows along Figure 6 , Figure 7 As shown by the arrow in the middle, the water flows to the brass clamp on the other side and enters the water inlet, then flows out of the water outlet through the bottom copper clamp, forming a complete cycle. It takes away the large amount of heat generated during the repair process and ensures that the blades are maintained at a suitable temperature.

[0054] Secondly, considering that the direction of the repair path may change when repairing the titanium alloy blade, the connection part between the clamping cooling head and the cladding head body is designed to be a groove structure that can rotate around the cladding head. This will not interfere with the circulation of cooling water, and the clamping direction of the clamping cooling head can be changed according to the deviation of the repair path, so that the titanium alloy blade is always kept in cooling; in this embodiment, the rotation angle between the clamping cooling head and the cladding head body can be controlled by setting a baffle in the groove, and the water seal is achieved by setting a sealing ring on the periphery of the groove.

[0055] During the repair process, several copper-inlaid graphite were installed on the two side plates, which greatly reduced the friction between the brass plates and the titanium alloy blades during movement.

[0056] like Figure 10-12 As shown, the present invention is a water-cooled integrated cladding head for repairing titanium alloy blades. The effects before and after the repair are as follows: Fig.13 As shown, the repair effect of the present invention compared with the prior art is as follows Fig.14 As shown, it can be seen that the present invention can further improve the effect of repairing titanium alloy blades.

[0057] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A water-cooled integrated cladding head for titanium alloy blade repair, comprising a cladding head body and a powder feeding channel (4) and a laser channel (5) arranged inside the cladding head body; characterized in that: The cladding head body also has a water cooling channel (3) inside, a clamping cooling head (2) is provided below the cladding head body, a clamping channel is provided in the middle of the clamping cooling head (2), and the clamping cooling head (2) is connected to the water cooling channel (3); during repair, the clamping channel of the clamping cooling head (2) moves along the blades on both sides, taking away the heat generated during repair, thereby reducing the generated local high temperature.

2. The water-cooled integrated cladding head for titanium alloy blade repair according to claim 1 is characterized in that: The clamping cooling head (2) comprises a water cooling plate (201), a clamping plate A (202) and a clamping plate B (203); the clamping plate A (202) and the clamping plate B (203) are both hollow structures; the clamping plate A (202) and the clamping plate B (203) are relatively arranged at the bottom of the water cooling plate (201), and a clamping channel is formed between the clamping plate A (202) and the clamping plate B (203).

3. The water-cooled integrated cladding head for titanium alloy blade repair according to claim 2 is characterized in that: The water cooling disk (201) is provided with a water inlet A (6) and a water outlet A (7) on one side of the clamping plate A (202); the water inlet A (6) and the water outlet A (7) are respectively connected to the clamping plate A (202), and a partition plate (8) is provided between the water inlet A (6) and the water outlet A (7); the water cooling disk (201) is provided with a water inlet B (9) and a water outlet B (10) on one side of the clamping plate B (203); the water inlet B (9) and the water outlet B (10) are respectively connected to the clamping plate B (203), and a partition plate (8) is provided between the water inlet B (9) and the water outlet B (10); the water outlet A (7) is connected to the water inlet B (9), and a partition plate (8) is provided between the water outlet B (10) and the water inlet A (6).

4. The water-cooled integrated cladding head for titanium alloy blade repair according to claim 1 is characterized in that: The inner sides of the clamping plate A (202) and the clamping plate B (203) are respectively inlaid with graphite (1).

5. The water-cooled integrated cladding head for titanium alloy blade repair according to claim 1 is characterized in that: The clamping cooling head (2) is movably connected to the cladding head body, so that the clamping cooling head (2) deflects and changes the clamping direction according to the deviation of the blade repair path.

6. The water-cooled integrated cladding head for titanium alloy blade repair according to claim 1 is characterized in that: The cladding head body and the clamping cooling head (2) are both made of brass.

7. The water-cooled integrated cladding head for titanium alloy blade repair according to claim 1 is characterized in that: The cladding head body and the clamping cooling head (2) are formed by 3D printing.

8. The working process of a water-cooled integrated cladding head based on titanium alloy blade repair according to claim 3 is characterized in that: The steps include: When the laser shines down from above, the powder and the laser are coupled in the laser channel, and the water flows into the clamping cooling head along the cooling channel. The water inlet A is connected to the entrance of the water cooling channel. The water flows into the clamping plate A from the water inlet A, flows out from the water outlet A, and enters the water inlet B, then enters the clamping plate B from the water inlet B, and flows out from the water outlet B into the outlet of the water cooling channel, forming a water cooling cycle to ensure that the temperature of the blade is lowered during repair.

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