Clamping tool and machining method for narrow and deep arc groove of engine turbine blade

Abstract

The invention relates to the technical field of aero-engines, and discloses a clamping tool and a machining method for a narrow and deep arc groove of an engine turbine blade, positioning of a blade tenon in the X-axis direction is achieved through a first positioning part, Y-axis positioning of the blade tenon is achieved through abutting of a second positioning part and an exhaust edge of the tenon, and the blade tenon is clamped in the clamping tool. The tooth structures of the first positioning part and the sliding clamping block are meshed with the tenon teeth and clamp the tenon, so that positioning of the blade tenon in the Z-axis direction is achieved, clamping and fixing of the blade tenon are achieved through the first positioning part and the sliding clamping block, clamping of the blade tenon is achieved, and forming machining of a narrow and deep arc groove of a blade is facilitated. According to the machining method, the blade is clamped through the clamping tool, vertical clamping of the machining part of the blade tenon narrow and deep arc groove is achieved, then the narrow and deep arc groove of the blade is machined on the slow feeding grinding machine, forming machining of the narrow and deep arc groove of the blade is achieved, and the purpose of improving the product percent of pass and the production efficiency is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of aviation engines and discloses a clamping tool and a processing method for a narrow and deep arc groove of an engine turbine blade. Background Art

[0002] Turbine blades are core components of turbines, subject to extreme thermal stress and centrifugal forces. Aircraft engine turbine blades are primarily made of nickel-based superalloys, which have poor machinability. The turbine blade tenon is a complex structure with multiple steps, narrow and deep grooves, requiring high precision and presenting significant machining challenges. Traditional machining methods, such as CNC milling, suffer from dimensional instability, poor surface quality, and low efficiency, creating bottlenecks in scientific research delivery. Summary of the Invention

[0003] The purpose of the present invention is to provide a clamping tool for the narrow and deep arc groove of the engine turbine blade, which helps to realize the narrow and deep arc groove forming processing of the blade and improve the product qualification rate and production efficiency.

[0004] The purpose of the present invention is to provide a method for processing narrow and deep arc grooves of engine turbine blades, so as to realize the forming processing of narrow and deep arc grooves of blades and improve product qualification rate and production efficiency.

[0005] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0006] A clamping tool for a narrow and deep arc groove of an engine turbine blade, comprising:

[0007] A base, wherein the base is provided with a first positioning portion and a sliding clamping block, the first positioning portion is provided with a first positioning surface, the first positioning surface and the sliding clamping block are both provided with a tooth structure, and the tenon of the blade is clamped by the tooth structure;

[0008] A second positioning portion, wherein the second positioning portion is used to abut and position the axial end surface of the tenon.

[0009] In this embodiment, the first positioning portion includes a first positioning block fixed to the base, and the tooth structure is provided on the first positioning block.

[0010] In this embodiment, the base is further provided with a fixing seat and a locking assembly. The fixing seat is fixed to the base. The locking assembly is connected to the sliding clamp block and drives the sliding clamp block to approach or move away from the first positioning portion.

[0011] In this embodiment, the locking assembly includes a support and a locking screw. The support is fixed to the base. The support is provided with a threaded hole. The locking screw is threadedly connected to the threaded hole and extends to the sliding clamp, connected to the sliding clamp, and the locking screw is threadedly connected to a locking nut.

[0012] In this embodiment, a connecting structure is provided at one end of the locking screw, and the connecting structure includes a cylindrical head and a connecting column. The cylindrical head is fixed to the locking screw via the connecting column. Assuming that the outer diameter of the locking screw is D1, the diameter of the connecting column is D2, and the maximum diameter of the cylindrical head is D3, then D1>D2 and D3>D2;

[0013] The sliding clamp is provided with a T-shaped slot, which includes a wide portion and a narrow portion that are interconnected. The cylindrical head is snapped into the wide portion of the T-shaped slot, and the connecting column is snapped into the narrow portion of the T-shaped slot. Assuming that the width of the wide portion of the T-shaped slot is d1 and the width of the narrow portion of the T-shaped slot is d2, then d1>D3 and D3>d2>D2.

[0014] In this embodiment, the second positioning portion is fixed to the base, and the second positioning portion is provided with a second positioning surface, and the second positioning surface abuts against the exhaust edge of the tenon.

[0015] In this embodiment, the second positioning portion includes a hook-shaped member, the positioning surface is provided at one end of the hook-shaped member, and the other end of the hook-shaped member is fixed to the base.

[0016] In this embodiment, the base is a U-shaped block, the first positioning portion is arranged on the first arm of the U-shaped block, the sliding clamping block is arranged on the second arm of the U-shaped block, and the base is also provided with a reinforcement block, which is fixed to the first arm and the second arm respectively.

[0017] In this embodiment, a bottom plate is further included, and the base is fixed to the bottom plate.

[0018] A method for machining a narrow and deep arc groove of an engine turbine blade comprises the following steps:

[0019] S1. Fix the clamping fixture to the work surface of the creep grinder and complete the blade clamping;

[0020] S2. Grinding the forming grinding wheel using a diamond roller;

[0021] S3. Use the reground forming grinding wheel to process the narrow and deep arc grooves on the blades.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The present invention realizes the positioning of the blade tenon in the X-axis direction through the first positioning part, realizes the Y-axis positioning of the blade tenon by abutting the exhaust edge of the tenon with the second positioning part, realizes the positioning of the blade tenon in the Z-axis direction by meshing the tooth structure of the first positioning part and the sliding clamp with the tenon teeth and clamping the tenon, and realizes the clamping and fixing of the blade tenon by the first positioning part and the sliding clamp, thereby realizing the clamping of the blade tenon, which helps to realize the narrow and deep arc groove forming processing of the blade and helps to improve the product qualification rate and production efficiency.

[0024] (2) The present invention clamps the blades by a clamping tool, and then processes the narrow and deep arc grooves of the blades on a slow-feed grinder, thereby realizing the narrow and deep arc groove forming processing of the blades, thereby achieving the purpose of improving product qualification rate and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram from the first perspective of a clamping fixture for a narrow and deep arc groove of an engine turbine blade in an embodiment;

[0026] Figure 2 2. A schematic diagram of a second perspective of a clamping fixture for a narrow and deep arc groove of an engine turbine blade in an embodiment;

[0027] Figure 3 This is a structural diagram of the base in the clamping tooling in the embodiment;

[0028] Figure 4 Schematic diagram of the structure of the fixing seat in the clamping tool in the embodiment;

[0029] Figure 5 Schematic diagram of the structure of the locking assembly in the clamping fixture in the embodiment;

[0030] Figure 6 Schematic diagram of the structure of the sliding clamp in the clamping tool in the embodiment;

[0031] Figure 7 Schematic diagram of the structure of the locking screw in the clamping fixture in the embodiment;

[0032] Figure 8 Schematic diagram of the multi-step narrow and deep arc groove indicated by the bold line in the turbine blade in the embodiment;

[0033] Among them, 1-bottom plate, 2-base, 21-first positioning block, 31-sliding clamping block, 311-T-slot, 32-fixed seat, 321-guide groove, 330-locking assembly, 331-support, 332-locking screw, 333-locking nut, 334-cylindrical head, 335-connecting column, 4-second positioning part, 5-reinforcement block, 6-tooth structure. DETAILED DESCRIPTION

[0034] The present invention will be described in further detail below with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the present invention to the following embodiments, as all technologies implemented based on the present invention fall within the scope of the present invention.

[0035] Example

[0036] See also Figure 1-8 , a clamping tool for a narrow and deep arc groove of an engine turbine blade, comprising:

[0037] The base 2 is provided with a first positioning portion and a sliding clamping block 31. The first positioning portion is provided with a first positioning surface. The first positioning surface and the sliding clamping block 31 are both provided with a tooth structure 6. The end surface of the sliding clamping block 31 in contact with the blade tenon is a 20° inclined surface, and the inclined surface is provided with a tooth structure 6 that engages with the tenon teeth. The first positioning portion and the sliding clamping block 31 clamp the tenon of the blade, and the tooth structure 6 engages with the tenon teeth of the tenon.

[0038] The second positioning portion 4 is used to abut and position the axial end surface of the tenon. In this embodiment, the second positioning portion 4 is used to abut and position the exhaust edge of the tenon.

[0039] The present invention realizes the positioning of the blade tenon in the X-axis direction through the first positioning part, utilizes the second positioning part 4 to abut the exhaust edge of the tenon to realize the Y-axis positioning of the blade tenon, utilizes the tooth structure 6 of the first positioning part and the sliding clamp 31 to mesh with the tenon teeth and clamp the tenon to realize the positioning of the blade tenon in the Z-axis direction, and realizes the clamping and fixing of the blade tenon through the first positioning part and the sliding clamp 31, thereby realizing the clamping of the blade tenon, which helps to realize the narrow and deep arc groove forming processing of the blade, and helps to improve the product qualification rate and production efficiency.

[0040] In this embodiment, the first positioning portion includes a first positioning block 21 fixed to the base 2. The end surface of the first positioning block 21 that contacts the blade tenon is a 20° inclined surface, which is the first positioning surface. The inclined surface is also provided with a tooth structure 6 that engages with the tenon teeth. In this embodiment, the first positioning block 21 is used to achieve positioning of the blade tenon in the X-axis direction.

[0041] In this embodiment, if Figure 1-4As shown, the base 2 is further provided with a fixing seat 32 and a locking assembly 330. The fixing seat 32 and the base 2 are positioned by pins and fixed by bolts. The fixing seat 32 and the base 2 are formed as one piece; a guide groove 321 is provided in the fixing seat 32, and the sliding clamp 31 is inserted into the guide groove 321. A H7 / g6 clearance fit is formed between the sliding clamp 31 and the guide groove 321 to ensure that the sliding clamp 31 can slide smoothly in the guide groove 321, but the gap between the sliding clamp 31 and the guide groove 321 will not be affected by the gap between the sliding clamp 31 and the guide groove 321. The gap value is too large, which affects the accuracy of the sliding clamp 31 in positioning and pressing the tenon. The locking assembly 330 is connected to the sliding clamp 31. When clamping the blade tenon, the sliding clamp 31 is driven close to the first positioning block 21 by the locking assembly 330 until the sliding clamp 31 and the first positioning block 21 clamp the tenon, and then locked and fixed. When the blade tenon needs to be released, the lock is released, and the sliding clamp 31 is driven away from the first positioning block 21 by the locking assembly 330 until the tenon can be removed from between the sliding clamp 31 and the first positioning block 21. In this embodiment, the locking assembly 330 provides power for clamping the blade tenon, and the guide groove 321 of the fixed seat 32 is clearance-matched with the sliding clamp 31, which provides a guarantee for the positioning accuracy of the tenon. The fixed seat 32 of this embodiment is connected to the base 2 by bolts, which facilitates the independent processing of the fixed seat 32 to ensure the accuracy of the guide groove 321.

[0042] It should be noted that the sliding clamping block 31 adopts a bar-shaped structure with a square cross-section, and the guide groove 321 correspondingly adopts a square groove to prevent the sliding clamping block 31 from rotating.

[0043] In this embodiment, if Figure 1-7 As shown, the locking assembly 330 includes a support 331 and a locking screw 332. The support 331 is fixed to the base 2 by bolts, and when the support 331 and the base 2 are assembled, the two are positioned by pins. The support 331 is provided with a threaded hole, and the locking screw 332 is threadedly connected to the threaded hole, and then extends to the sliding clamp 31 and is connected to the sliding clamp 31. The locking screw 332 is threadedly connected to the locking nut 333. When the blade tenon is clamped, the locking screw 332 is turned to drive the sliding clamp 31 to move closer to the first positioning block 21 until the sliding clamp 31 and the first positioning block 21 clamp the tenon, and then tighten the locking nut 333. The locking nut 333 and the support 331 together form a double nut anti-loosening; when the blade tenon needs to be released, loosen the locking nut 333 to release the lock, reverse the locking screw 332, and drive the sliding clamp 31 away from the first positioning block 21 until the tenon can be removed from between the sliding clamp 31 and the first positioning portion.

[0044] In this embodiment, if Figure 1-7As shown, in order to achieve the connection between the locking screw 332 and the sliding clamp 31, a connecting structure is provided at one end of the locking screw 332, which includes a cylindrical head 334 and a connecting column 335. The cylindrical head 334 is fixed to the locking screw 332 through the connecting column 335. Assuming that the outer diameter of the locking screw 332 is D1, the diameter of the connecting column 335 is D2, and the maximum diameter of the cylindrical head 334 is D3, the sizes of D1, D2 and D3 satisfy: D1>D2 and D3>D2;

[0045] A T-slot 311 is provided at the tail of the sliding clamp 31, and the T-slot 311 includes a wide part and a narrow part that are interconnected. When the connecting structure of the locking screw 332 is connected to the T-slot 311, the cylindrical head 334 is inserted into the wide part of the T-slot 311, and the connecting column 335 is inserted into the narrow part of the T-slot 311. Assuming that the width of the wide part of the T-slot 311 is d1 and the width of the narrow part of the T-slot 311 is d2, then d1>D3 and D3>d2>D2, ensure that the connecting structure and the T-slot 311 will not be separated, and ensure that the connecting structure and the T-slot 311 can stably transmit the driving force of the locking screw 332.

[0046] It should be noted that when the sliding clamp 31 is installed in the guide groove 321 of the fixed seat 32, in order to facilitate the connection between the locking screw 332 and the sliding clamp 31, a notch is provided at the tail of the fixed seat 32 to expose the T-slot 311 of the sliding clamp 31, so that the connection structure of the locking screw 332 can be smoothly inserted into or removed from the T-slot 311.

[0047] In this embodiment, if Figure 1-2 As shown, the second positioning portion 4 includes a hook-shaped member, one end of which is provided with a second positioning surface that abuts against the exhaust edge of the tenon, and the other end of the hook-shaped member is fixed to the base 2. When clamping the blade, the second positioning surface of the hook-shaped member abuts against the exhaust edge of the tenon to achieve positioning of the blade tenon in the Y-axis direction.

[0048] In this embodiment, if Figure 1-2 As shown, the base 2 is a U-shaped block, with a first positioning block 21 located on the first arm of the U-shaped block and a sliding clamp 31 located on the second arm to reduce the weight of the U-shaped block. To increase the rigidity of the U-shaped block, the base 2 is also equipped with a reinforcement block 5, which is fixed to the first arm and the second arm respectively. It should be noted that an avoidance zone is also provided on the first arm where the first positioning block 21 is located to make room for the forming grinding wheel to process narrow and deep arc grooves.

[0049] In this embodiment, if Figure 1-2 As shown, the clamping tool also includes a base plate 1, a base 2 is fixed on the base plate 1, and a handle is also installed on the base plate 1.

[0050] Based on the same inventive concept, this embodiment also provides a method for machining a narrow and deep arc groove of an engine turbine blade, which comprises the following steps:

[0051] S1. Install the diamond roller used to process the narrow and deep arc grooves of the blades into the roller shaft of the slow-feed grinder.

[0052] S2. Install the profiled grinding wheel used for machining the narrow and deep arc grooves of the blades into the spindle of the creep-feed grinder.

[0053] S3. Place the fixture used to process the narrow and deep arc grooves of turbine blades on the worktable of the slow-feed grinder. Align the fixture to ensure that the perpendicularity of the fixture to the machine tool spindle in the X and Y directions is ≤0.02mm, and fix the clamping fixture in place on the worktable.

[0054] S4. Place the blade to be processed into the clamping fixture, ensuring that the gap between each positioning surface of the fixture and the positioning surface of the blade tenon is ≤0.02mm.

[0055] S5. Call up the blade narrow deep arc groove creep grinding and repair program of the machine tool, use a diamond roller to grind the shape of the forming grinding wheel so that the working surface of the forming grinding wheel has a shape for forming the blade narrow deep arc groove, and the forming grinding wheel adopts a large hole grinding wheel.

[0056] S6. Retrieve the machine tool's blade narrow and deep arc groove creep grinding program, and use a formed grinding wheel to process the blade narrow and deep arc groove. During processing, check the coolant flushing position, cooling nozzle position and angle to ensure that the coolant is concentratedly flushed to the lowest point of the grinding wheel, that is, the blade narrow and deep arc groove processing area, to ensure sufficient cooling.

[0057] S7. After processing is completed, remove the blade from the clamping fixture and blow dry the blade with an air gun.

[0058] S8. Use a special measuring tool for blade narrow and deep arc grooves to detect the dimensions of the narrow and deep arc grooves, and record the blade processing dimensions and other quality files.

[0059] S9. Gently place the blade into a clean parts box.

[0060] S10. Process the next blade narrow and deep arc groove according to the above steps 4 to 9.

[0061] The present invention clamps the blade by clamping tooling, thereby realizing vertical clamping of the narrow and deep circular arc groove processing part of the blade tenon, and making the arc center line of the narrow and deep circular arc groove of the processing part parallel to the machine tool spindle, and the side surface of the circular arc groove is parallel to the machine tool worktable, and then on the slow-feed grinder, a large bore grinding wheel is trimmed with a diamond roller with the same shape as the blade circular arc groove and higher precision, and then the large bore grinding wheel is used to process the narrow and deep circular arc groove of the blade, thereby realizing the narrow and deep circular arc groove forming processing of the blade, and achieving the purpose of improving product qualification rate and production efficiency.

[0062] It should be noted that if Figure 8 As shown, after the blade is clamped by the clamping fixture, the multi-step narrow and deep arc groove forming process of the turbine blade can be realized by the processing method of the present invention. The multi-step narrow and deep arc groove is as shown in FIG. Figure 8 The area shown by the thick line contains the arc groove. In order to realize the multi-step narrow and deep arc groove forming processing of the turbine blade, it is only necessary to modify the working surface shape of the diamond roller so that the grinding wheel after grinding has a shape that can form multi-step narrow and deep arc grooves.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A clamping tool for narrow and deep arc grooves of engine turbine blades, characterized in that: include: A base (2), the base (2) is provided with a first positioning portion and a sliding clamp (31), the first positioning portion is provided with a first positioning surface, the first positioning surface and the sliding clamp (31) are both provided with a tooth structure (6), and the first positioning portion and the sliding clamp (31) clamp the tenon of the blade through the tooth structure (6); A second positioning portion (4), the second positioning portion (4) is used for abutting and positioning the axial end surface of the tenon.

2. The clamping fixture for the narrow and deep arc groove of the engine turbine blade according to claim 1, characterized in that: The first positioning portion comprises a first positioning block (21) fixed to the base (2), and the tooth structure (6) is provided on the first positioning block (21).

3. The clamping fixture for the narrow and deep arc groove of the engine turbine blade according to claim 1, characterized in that: The base (2) is further provided with a fixing seat (32) and a locking assembly (330), wherein the fixing seat (32) is fixed to the base (2), and the locking assembly (330) is connected to the sliding clamp (31) and drives the sliding clamp (31) to move closer to or away from the first positioning portion.

4. The clamping fixture for the narrow and deep arc groove of the engine turbine blade according to claim 3, characterized in that: The locking assembly (330) includes a support (331) and a locking screw (332), wherein the support (331) is fixed to the base (2), the support (331) is provided with a threaded hole, the locking screw (332) is threadedly connected to the threaded hole and extends to the sliding clamp (31), is connected to the sliding clamp (31), and the locking screw (332) is threadedly connected to a locking nut (333).

5. The clamping fixture for the narrow and deep arc groove of the engine turbine blade according to claim 4, characterized in that: One end of the locking screw (332) is provided with a connecting structure, the connecting structure comprising a cylindrical head (334) and a connecting column (335), the cylindrical head (334) is fixed to the locking screw (332) via the connecting column (335), assuming that the outer diameter of the locking screw (332) is D1, the diameter of the connecting column (335) is D2, and the maximum diameter of the cylindrical head (334) is D3, then D1>D2 and D3>D2; The sliding clamp (31) is provided with a T-shaped slot (311), and the T-shaped slot (311) includes a wide portion and a narrow portion that are interconnected. The cylindrical head (334) is inserted into the wide portion of the T-shaped slot (311), and the connecting column (335) is inserted into the narrow portion of the T-shaped slot (311). Assuming that the width of the wide portion of the T-shaped slot (311) is d1 and the width of the narrow portion of the T-shaped slot (311) is d2, then d1>D3 and D3>d2>D2.

6. The clamping fixture for the narrow and deep arc groove of an engine turbine blade according to claim 1, characterized in that: The second positioning portion (4) is fixed to the base (2), and the second positioning portion (4) is provided with a second positioning surface, and the second positioning surface abuts against the exhaust edge of the tenon.

7. The clamping fixture for the narrow and deep arc groove of the engine turbine blade according to claim 6, characterized in that: The second positioning portion (4) comprises a hook-shaped member, the positioning surface is provided at one end of the hook-shaped member, and the other end of the hook-shaped member is fixed to the base (2).

8. The clamping fixture for the narrow and deep arc groove of an engine turbine blade according to claim 1, characterized in that: The base (2) is a U-shaped block, the first positioning portion is provided on the first arm of the U-shaped block, the sliding clamping block (31) is provided on the second arm of the U-shaped block, and the base (2) is further provided with a reinforcement block (5), and the reinforcement block (5) is fixed to the first arm and the second arm respectively.

9. The clamping fixture for the narrow and deep arc groove of an engine turbine blade according to claim 1, characterized in that: It also includes a bottom plate (1), and the base (2) is fixed to the bottom plate (1).

10. A method for machining a narrow and deep arc groove of an engine turbine blade, characterized in that: The following steps are involved: S1. The clamping tool according to any one of claims 1-9 is fixed on the work surface of the slow-feed grinder and completes the blade clamping; S2. Grinding the forming grinding wheel using a diamond roller; S3. Use the reground forming grinding wheel to process the narrow and deep arc grooves on the blades.

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