A clamping fixture for machining the assembly dimensions of steam turbine blades and its method of use.

Abstract

A clamping fixture and its method for machining the assembly dimensions of turbine blades are disclosed, relating to the field of turbine blade machining technology. This invention addresses the problem that existing clamping fixtures sometimes cause the root crown of the moving blade to tilt upwards during machining, leading to blade vibration and resulting in a surface finish that does not meet technical requirements. Furthermore, these fixtures are not applicable to various blade types, resulting in poor versatility. The invention comprises a blade root positioning block located at the center of the upper upper surface of a base, a strip-shaped groove machined along the diameter of the upper surface, on which a blade crown positioning and clamping slider is mounted. A support block is located at the center of the lower lower part of the upper surface of the base, with a threaded hole machined at the center of its side end face. A threaded push rod is installed inside this threaded hole. A blade root inlet / outlet steam side positioning block is located at the lower end of one end of the blade root positioning block on the upper surface of the base, and a blade crown inlet / outlet steam side positioning block is located below this block. This invention is applicable to the machining of moving blades.

Description

Technical Field

[0001] This invention relates to the field of turbine blade machining technology, specifically to a clamping fixture for machining the assembly dimensions of turbine blades and its usage method. Background Technology

[0002] Turbine blades are core power components of steam turbines, and their assembly dimensional accuracy directly determines the overall assembly accuracy, operational stability, and service life of the steam turbine. Currently, in the industry, conventional clamping fixtures used for processing and dimensional correction of turbine blades are relatively simple, mostly only capable of basic clamping and positioning. They cannot adapt to the different shapes and dimensions of turbine blades of various specifications and models, resulting in poor clamping versatility. Furthermore, traditional fixtures lack sufficient clamping and positioning stability, easily leading to blade misalignment and loosening during processing. This can easily cause dimensional deviations in blade processing and large assembly alignment errors, making it difficult to accurately control the dimensional accuracy of the blade end face, tenon, and assembly reference surface. Excessive clamping force can cause the blade root crown to warp and deform, while insufficient force can result in the blade not being clamped, leading to scrap. Inconsistent force results in varying degrees of deformation, causing excessive dimensional deviations. Moreover, the warping of the root crown during the cutting process causes vibration, resulting in surface finish that does not meet technical requirements. Processing different levels and types of blades requires finding suitable shims for mold placement, wasting time and manpower. Additionally, the wear and tear on bolts, shims, and flip plates is also significant.

[0003] In summary, when existing clamping fixtures clamp the moving blades, the root cap of the moving blades tends to curl upwards during the machining process. This causes the blades to vibrate during machining, resulting in the surface finish of the machined blades failing to meet technical requirements. Furthermore, the fixtures are not applicable to various types of blades, leading to poor versatility. Summary of the Invention

[0004] This invention addresses the problem that existing clamping fixtures, when clamping moving blades, cause the root crown of the moving blades to curl upwards during processing, resulting in blade vibration and thus failing to meet technical requirements for surface finish. Furthermore, these fixtures are not applicable to various types of blades, leading to poor versatility. To solve this problem, this invention proposes a clamping fixture and its usage method for processing the assembly dimensions of turbine moving blades.

[0005] The present invention provides a clamping fixture for machining the assembly dimensions of turbine blades, comprising a base 1, a blade root positioning block 2, a blade crown positioning and clamping slider 3, a blade root inlet / outlet steam side positioning block 4, a blade crown inlet / outlet steam side positioning block 5, a support block 6, and a threaded push rod 7.

[0006] A blade root positioning block 2 is provided at the center of the upper part of the upper surface of the base 1. A strip groove is machined along the diameter direction on the upper surface of the base 1. A blade crown positioning clamping slider 3 is provided on the strip groove. A support block 6 is provided at the center of the lower part of the upper surface of the base 1. A threaded hole is machined at the center of the side end face of the support block 6. A threaded push rod 7 is provided inside the threaded hole. A blade root inlet / outlet steam side positioning block 4 is provided at the lower part of one end of the blade root positioning block 2 on the upper surface of the base 1. A blade crown inlet / outlet steam side positioning block 5 is provided at the lower part of the blade root inlet / outlet steam side positioning block 4.

[0007] Furthermore, the blade root inlet / outlet steam side positioning block 4 is fixedly connected to the upper surface of the base 1 by bolts;

[0008] Furthermore, the upper surface of the blade root inlet / outlet steam side positioning block 4 is machined with a waist-shaped hole along the length direction in the middle.

[0009] Furthermore, the blade crown inlet / outlet steam side positioning block 5 is fixedly connected to the upper surface of the base 1 by bolts;

[0010] Furthermore, the upper surface of the blade crown inlet / outlet steam side positioning block 5 is machined with a waist-shaped hole along the length direction in the middle.

[0011] Furthermore, the axis of the blade root inlet / outlet steam side positioning block 4 is set perpendicular to the axis of the blade crown inlet / outlet steam side positioning block 5;

[0012] Furthermore, the base 1, the leaf root positioning block 2, and the support block 6 are integrally formed;

[0013] Furthermore, an arc-shaped waist hole 8 is machined at each end of the upper surface of the base 1;

[0014] Furthermore, the leaf crown positioning and clamping slider 3 is slidably connected to the strip groove on the upper surface of the base 1;

[0015] Furthermore, the specific steps of using a clamping fixture for machining turbine blade assembly dimensions according to the present invention are as follows:

[0016] Step 1: Install the base 1 onto the flip plate by using the arc-shaped waist hole 8 and the locking bolt;

[0017] Step 2: Place the turbine blades on the upper surface of the base 1. The main function of the blade root positioning block 2 is to determine the position of the blades in the Y-axis direction. Since the blade root positioning block 2 is integrated with the base 1, it effectively prevents the blades from shifting in the Y-axis direction during the processing.

[0018] Step 3: Rotate the threaded push rod 7, and push the blade crown positioning clamping slider 3 to slide on the strip groove on the upper surface of the base 1 through the threaded hole on the side end face of the support block 6, so that the blade crown positioning clamping slider 3 moves along the Y-axis until it contacts and clamps against the blade root.

[0019] Step 4: By adjusting the position of the blade root steam inlet / outlet side positioning block 4 and the blade crown steam inlet / outlet side positioning block 5 relative to the base 1, and by using a slider that allows the blade root steam inlet / outlet side positioning block 4 and the blade crown steam inlet / outlet side positioning block 5 to move in the X-axis direction and rotate 360°, the positioning of different types of blades in the X-axis direction can be achieved.

[0020] Step 5: Finally, using the disc-shaped base 1 and the two arc-shaped waist holes 8 on the upper surface of the base 1, the base 1 is rotated relative to the flip plate to determine the position of the blade in the Z-axis direction. The blade is then aligned in the X and Y-axis directions by the flip plate and its own rotation, thus completing the clamping of the turbine blade.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. This invention overcomes the shortcomings of the prior art by using the blade root positioning block on the base to determine the position of the blade in the Y-axis direction, effectively preventing the blade from shifting in the Y-axis direction during processing. Then, through the threaded hole on the side end face of the support block, the blade crown positioning clamping slider is pushed to slide in the strip groove on the upper surface of the base, so that the blade crown positioning clamping slider moves along the Y-axis direction until it contacts and presses against the blade root, thus achieving clamping and positioning of the blade root. This effectively avoids the phenomenon of the root crown of the moving blade tilting upward during processing, thereby eliminating the phenomenon of blade vibration and ensuring that the surface finish of the processed blade meets the technical requirements.

[0023] 2. This invention overcomes the shortcomings of the prior art. By adjusting the position of the blade root steam inlet / outlet positioning block and the blade crown steam inlet / outlet positioning block relative to the base, and by using a slider that allows the blade root steam inlet / outlet positioning block and the blade crown steam inlet / outlet positioning block to move in the X-axis direction and rotate 360°, different types of blades can be positioned in the X-axis direction, achieving one-time clamping and completion of processing, thus improving the versatility of the clamping fixture.

[0024] 3. This invention overcomes the shortcomings of the prior art by using a disc-shaped base with two arc-shaped waist holes on the upper surface of the base to rotate the base relative to the flip plate, so as to determine the position of the blade in the Z-axis direction. The blade is aligned in the X and Y-axis directions by the rotation of the flip plate and itself, thereby clamping the turbine blade, reducing the positioning time, improving work efficiency and alleviating the production pressure of tight schedules and heavy tasks. Attached Figure Description

[0025] Figure 1 This is a top view of a clamping fixture for machining the assembly dimensions of turbine blades, as described in this invention. Detailed Implementation

[0026] Specific implementation method one: Combining Figure 1 This embodiment describes a clamping fixture for machining the assembly dimensions of turbine blades. The fixture comprises a base 1, a blade root positioning block 2, a blade crown positioning and clamping slider 3, a blade root inlet / outlet steam side positioning block 4, a blade crown inlet / outlet steam side positioning block 5, a support block 6, and a threaded push rod 7.

[0027] A blade root positioning block 2 is provided at the center of the upper part of the upper surface of the base 1. A strip groove is machined along the diameter direction on the upper surface of the base 1. A blade crown positioning clamping slider 3 is provided on the strip groove. A support block 6 is provided at the center of the lower part of the upper surface of the base 1. A threaded hole is machined at the center of the side end face of the support block 6. A threaded push rod 7 is provided inside the threaded hole. A blade root inlet / outlet steam side positioning block 4 is provided at the lower part of one end of the blade root positioning block 2 on the upper surface of the base 1. A blade crown inlet / outlet steam side positioning block 5 is provided at the lower part of the blade root inlet / outlet steam side positioning block 4.

[0028] In this specific embodiment, the blade root positioning block 2 primarily functions to determine the blade's position along the Y-axis. Since the blade root positioning block 2 is integrated with the base 1, it effectively prevents blade displacement along the Y-axis during processing. The blade crown positioning and clamping slider 3 is a movable slider that moves along the Y-axis by rotating the threaded push rod 7, cooperating with the blade root positioning block 2 to clamp the blade. The blade root inlet / outlet steam side positioning block 4 and the blade crown inlet / outlet steam side positioning block 5 are sliders that move along the X-axis and can rotate 360°. Rotation and movement allow for positioning different types of blades along the X-axis. The base 1 is a disc with two arc-shaped waist holes 8, primarily functioning to determine the blade's position along the Z-axis and aligning the blade along the X and Y axes through a flip plate and its own rotation.

[0029] Specific Implementation Method Two: Combining Figure 1 This embodiment further defines the clamping fixture described in Specific Embodiment 1. The clamping fixture described in this embodiment is used for machining the assembly dimensions of turbine blades. The blade root inlet / outlet steam side positioning block 4 is fixedly connected to the upper surface of the base 1 by bolts.

[0030] Specific implementation method three: Combining Figure 1This embodiment is a further limitation of the clamping fixture described in Specific Embodiment 2. The clamping fixture described in this embodiment is used to process the assembly dimensions of turbine blades. The upper surface of the blade root inlet / outlet steam side positioning block 4 is machined with a waist-shaped hole along the length direction.

[0031] In this specific embodiment, a waist-shaped hole is machined in the middle of the upper surface of the blade root inlet / outlet steam side positioning block 4 along the length direction. The blade root inlet / outlet steam side positioning block 4 is then fixedly connected to the upper surface of the base 1 by bolts. This allows the position of the blade root inlet / outlet steam side positioning block 4 to be adjusted along the axial direction, so as to be suitable for turbine blades of different sizes or models.

[0032] Specific implementation method four: Combination Figure 1 This embodiment further defines the clamping fixture described in Specific Embodiment 1. The clamping fixture described in this embodiment is used for machining the assembly dimensions of turbine blades. The blade crown inlet / outlet steam side positioning block 5 is fixedly connected to the upper surface of the base 1 by bolts.

[0033] Specific Implementation Method Five: Combining Figure 1 This embodiment further defines the clamping fixture described in Specific Embodiment 4. The clamping fixture described in this embodiment is used to process the assembly dimensions of turbine blades. The upper surface of the blade crown inlet / outlet steam side positioning block 5 is machined with a waist-shaped hole along the length direction.

[0034] In this specific embodiment, a waist-shaped hole is machined in the middle of the upper surface of the turbine inlet / outlet steam side positioning block 5 along the length direction. The turbine inlet / outlet steam side positioning block 5 is then fixedly connected to the upper surface of the base 1 by bolts. This allows the position of the turbine inlet / outlet steam side positioning block 5 to be adjusted along the axial direction, so as to be suitable for turbine blades of different sizes or models.

[0035] Specific Implementation Method Six: Combination Figure 1 This embodiment further defines the clamping fixture described in Specific Embodiment 1. The clamping fixture described in this embodiment is used for machining the assembly dimensions of turbine blades. The axis of the blade root inlet / outlet steam side positioning block 4 is set perpendicular to the axis of the blade crown inlet / outlet steam side positioning block 5.

[0036] Specific implementation method seven: Combining Figure 1 This embodiment further defines the clamping fixture described in Specific Embodiment 1. The clamping fixture described in this embodiment is for processing the assembly dimensions of turbine blades, wherein the base 1, blade root positioning block 2, and support block 6 are integrally formed.

[0037] In this specific embodiment, the main function of the blade root positioning block 2 is to determine the position of the blade in the Y-axis direction. At the same time, since the blade root positioning block 2 and the base 1 are integrated, it effectively prevents the blade from shifting in the Y-axis direction during the processing.

[0038] Specific implementation method eight: Combination Figure 1 This embodiment further defines the clamping fixture described in Specific Embodiment Seven. The clamping fixture described in this embodiment is used for processing the assembly dimensions of turbine blades. The upper surface of the base 1 has an arc-shaped waist hole 8 processed at both ends.

[0039] In this specific embodiment, the base 1 is disc-shaped, and the two arc-shaped waist holes 8 on the upper surface of the base 1 are used to rotate the base 1 relative to the flip plate, so as to determine the position of the blade in the Z-axis direction, and to achieve the alignment of the blade in the X and Y-axis directions by the rotation of the flip plate and itself.

[0040] Specific Implementation Method Nine: Combining Figure 1 This embodiment further defines the clamping fixture described in Specific Embodiment 1. The clamping fixture described in this embodiment is used for machining the assembly dimensions of turbine blades. The blade crown positioning clamping slider 3 is slidably connected to the strip groove on the upper surface of the base 1.

[0041] Specific Implementation Method Ten: Combining Figure 1 This embodiment describes a method for using a clamping fixture for machining turbine blade assembly dimensions. The specific steps are as follows:

[0042] Step 1: Install the base 1 onto the flip plate by using the arc-shaped waist hole 8 and the locking bolt;

[0043] Step 2: Place the turbine blades on the upper surface of the base 1. The main function of the blade root positioning block 2 is to determine the position of the blades in the Y-axis direction. Since the blade root positioning block 2 is integrated with the base 1, it effectively prevents the blades from shifting in the Y-axis direction during the processing.

[0044] Step 3: Rotate the threaded push rod 7, and push the blade crown positioning clamping slider 3 to slide on the strip groove on the upper surface of the base 1 through the threaded hole on the side end face of the support block 6, so that the blade crown positioning clamping slider 3 moves along the Y-axis until it contacts and clamps against the blade root.

[0045] Step 4: By adjusting the position of the blade root steam inlet / outlet side positioning block 4 and the blade crown steam inlet / outlet side positioning block 5 relative to the base 1, and by using a slider that allows the blade root steam inlet / outlet side positioning block 4 and the blade crown steam inlet / outlet side positioning block 5 to move in the X-axis direction and rotate 360°, the positioning of different types of blades in the X-axis direction can be achieved.

[0046] Step 5: Finally, using the disc-shaped base 1 and the two arc-shaped waist holes 8 on the upper surface of the base 1, the base 1 is rotated relative to the flip plate to determine the position of the blade in the Z-axis direction. The blade is then aligned in the X and Y-axis directions by the flip plate and its own rotation, thus completing the clamping of the turbine blade.

Claims

1. A clamping fixture for machining the assembly dimensions of turbine blades, characterized in that: It includes a base (1), a blade root positioning block (2), a blade crown positioning clamping slider (3), a blade root inlet / outlet steam side positioning block (4), a blade crown inlet / outlet steam side positioning block (5), a support block (6), and a threaded push rod (7). A blade root positioning block (2) is provided at the center of the upper part of the upper surface of the base (1). A strip groove is machined along the diameter direction on the upper surface of the base (1). A blade crown positioning clamping slider (3) is provided on the strip groove. A support block (6) is provided at the center of the lower part of the upper surface of the base (1). A threaded hole is machined at the center of the side end face of the support block (6). A threaded push rod (7) is provided inside the threaded hole. A blade root inlet / outlet steam side positioning block (4) is provided at the lower part of one end of the blade root positioning block (2) on the upper surface of the base (1). A blade crown inlet / outlet steam side positioning block (5) is provided at the lower part of the blade root inlet / outlet steam side positioning block (4).

2. The clamping fixture for machining the assembly dimensions of turbine blades according to claim 1, characterized in that: The blade root inlet / outlet steam side positioning block (4) is fixedly connected to the upper surface of the base (1) by bolts.

3. A clamping fixture for machining the assembly dimensions of turbine blades according to claim 2, characterized in that: The upper surface of the blade root inlet / outlet steam side positioning block (4) is machined with a waist-shaped hole along the length direction.

4. A clamping fixture for machining the assembly dimensions of turbine blades according to claim 1, characterized in that: The blade crown inlet / outlet steam side positioning block (5) is fixedly connected to the upper surface of the base (1) by bolts.

5. A clamping fixture for machining the assembly dimensions of turbine blades according to claim 4, characterized in that: The upper surface of the aforementioned blade crown inlet / outlet steam side positioning block (5) has a waist-shaped hole machined along its length.

6. A clamping fixture for machining the assembly dimensions of turbine blades according to claim 4, characterized in that: The axis of the blade root inlet / outlet steam side positioning block (4) is set perpendicular to the axis of the blade crown inlet / outlet steam side positioning block (5).

7. A clamping fixture for machining the assembly dimensions of turbine blades according to claim 1, characterized in that: The base (1), leaf root positioning block (2) and support block (6) are integrated into one unit.

8. A clamping fixture for machining the assembly dimensions of turbine blades according to claim 7, characterized in that: The upper surface of the base (1) is machined with an arc-shaped waist hole (8) at each end.

9. A clamping fixture for machining the assembly dimensions of turbine blades according to claim 1, characterized in that: The leaf crown positioning clamping slider (3) is slidably connected to the strip groove on the upper surface of the base (1).

10. A method of using a clamping fixture for machining turbine blade assembly dimensions according to claims 1 to 9, characterized in that: The specific steps are as follows: Step 1: Install the base (1) onto the flip plate through the arc-shaped waist hole (8) and the locking bolt; Step 2: Place the turbine blades on the upper surface of the base (1). The main function of the blade root positioning block (2) is to determine the position of the blades in the Y-axis direction. Since the blade root positioning block (2) and the base (1) are integrated, it effectively prevents the blades from shifting in the Y-axis direction during the processing. Step 3: Rotate the threaded push rod (7) and push the blade crown positioning clamping slider (3) to slide on the strip groove on the upper surface of the base (1) through the threaded hole on the side end face of the support block (6), so that the blade crown positioning clamping slider (3) moves along the Y-axis until it contacts and clamps against the blade root. Step 4: By adjusting the position of the blade root steam inlet / outlet positioning block (4) and the blade crown steam inlet / outlet positioning block (5) relative to the base (1), and by using a slider that allows the blade root steam inlet / outlet positioning block (4) and the blade crown steam inlet / outlet positioning block (5) to move in the X-axis direction and rotate 360°, the positioning of different types of blades in the X-axis direction can be achieved. Step 5: Finally, the base (1) is disc-shaped and has two arc-shaped waist holes (8) on the upper surface of the base (1) to rotate the base (1) relative to the flip plate, so as to determine the position of the blade in the Z-axis direction, and to achieve the alignment of the blade in the X and Y-axis directions by the flip plate and its own rotation, thereby completing the clamping of the turbine blade.

Images