Turbine blade sharpening fixture and sharpening method

Abstract

This invention provides a turbine blade tipping fixture and tipping method. The tipping fixture includes a support unit, a clamping unit, a locking unit, and an angle adjustment unit. The support unit includes a column, and the clamping unit includes a carrier and a blade clamping member that accommodates and clamps the turbine blade. A pressure plate is detachably connected to the carrier. The pressure plate and set screw of the locking unit limit and press the blade clamping member into the U-shaped portion of the carrier. The angle adjustment unit includes a rotating shaft and a knob. The rotating shaft passes through the column, and the knob is connected to one end of the rotating shaft on one side of the column. The carrier is connected to the other end of the rotating shaft on the other side of the column. The rotating shaft drives the carrier and the blade clamping member to rotate. Using this tipping fixture and method, the turbine blade is fixed and the grinding wheel position is moved back and forth during tipping repair, improving the tipping field of vision. During the tipping process, the condition of the blade tip thin blade area can be accurately judged, and the relative position of the blade and the grinding wheel can be adjusted at any time to remove material evenly, thus improving the repair quality and efficiency.

Description

Technical Field

[0001] This invention relates to the field of turbine starter repair technology, specifically to a turbine blade sharpening fixture and sharpening method. Background Technology

[0002] Turbine blades are a crucial component of turbine starters. To improve the efficiency of turbine starters, the turbine blades need to be sharpened. The sharpening of turbine blades for a certain type of turbine starter requires uniform width and thickness of the blade tip's thin cutter section. Furthermore, the blade has a curved surface. To meet these requirements, the blade must rotate back and forth with the grinding wheel according to the blade's curvature during sharpening. The traditional sharpening method involves fixing the grinding wheel, having the operator hold the blade, and pressing the area to be sharpened against the grinding wheel while moving the blade back and forth along the blade's profile to evenly remove material, thus meeting the dimensional and surface roughness requirements of the thin cutter section. This method makes it impossible to observe the condition of the blade tip's thin cutter section during sharpening, relying entirely on human experience and feel. It demands a high level of skill from the operator, and the direction and force of blade rotation are difficult to control, easily leading to operator fatigue, thus affecting repair quality and efficiency.

[0003] Therefore, there is a need to improve the method of turbine blade tipping. Summary of the Invention

[0004] In order to overcome the shortcomings of existing tipping methods, which involve fixing the grinding wheel and requiring hand-held blade movement for tipping, resulting in low tipping quality and efficiency, this invention provides a turbine blade tipping fixture and a turbine blade tipping method.

[0005] The technical solution of this invention is:

[0006] A turbine blade sharpening fixture is characterized by comprising a support unit, a clamping unit, a locking unit, and an angle adjustment unit;

[0007] The support unit is used to support the clamping unit, the locking unit and the angle adjustment unit, and includes a column;

[0008] The clamping unit is used to clamp the turbine blades to be sharpened and includes a carrier and a blade clamping component.

[0009] The support component includes a U-shaped portion, the opening of which is vertically open.

[0010] The blade holder is provided with a V-shaped groove for accommodating and holding the turbine blade;

[0011] The setter unit is used to clamp the blade clamping member and includes a pressure plate and a set screw.

[0012] The pressure plate and the carrier are detachably connected. The pressure plate and the set screw together limit and press the blade clamping part into the U-shaped part of the carrier.

[0013] The angle adjustment unit is used to rotate the clamping unit and includes a rotating shaft and a knob.

[0014] The pivot passes horizontally through the column, with the knob located on one side of the column and connected to one end of the pivot. The support component is located on the other side of the column and connected to the other end of the pivot.

[0015] The rotating shaft can drive the carrier and the blade holder containing the turbine blades inside to rotate to the required angle and lock it with a knob.

[0016] Furthermore, the support member also includes a tab portion protruding outward from the free end of the leg of the U-shaped portion, and the locking unit also includes a bolt and nut assembly, with the pressure plate connected to the tab portion via the bolt and nut assembly.

[0017] Furthermore, the V-groove of the blade holder has multiple grooves that match the tenons of the turbine blade.

[0018] Furthermore, the support unit also includes a worktable fixed to the bottom end of the column to support the operator's arm when the operator is sharpening the turbine blades.

[0019] Furthermore, the knob is a nut with a handle, which is connected to the shaft via a threaded connection.

[0020] Furthermore, the column has a recess above the part where the rotating shaft is installed to facilitate the removal of the turbine blade sharpening clamp.

[0021] Furthermore, the workbench was made of bakelite board.

[0022] A method for sharpening turbine blades using the aforementioned turbine blade sharpening fixture is characterized by comprising the following steps:

[0023] Step 1: Remove the pressure plate from the support component;

[0024] Step 2: Insert the tenon of the turbine blade to be sharpened into the V-groove of the blade holder;

[0025] Step 3: Reinstall the pressure plate and tighten the set screws to limit and press the blade holder with turbine blades into the U-shaped part of the carrier.

[0026] Step 4: Move the grinding wheel back and forth to sharpen the turbine blades;

[0027] Step 5: During the sharpening process, rotate the shaft and lock it with the knob to adjust the angle of the turbine blades.

[0028] The beneficial effects of this invention are:

[0029] 1. The turbine blade sharpening fixture and sharpening method provided by the present invention provide a turbine blade with a support unit, a clamping unit and a locking unit to firmly clamp the turbine blade. During the sharpening repair, by fixing the turbine blade and moving the grinding wheel back and forth, the blade sharpening field of vision is improved. During the sharpening process, the condition of the blade tip thin blade part can be accurately judged, the relative position of the blade and the grinding wheel can be adjusted at any time, and the material can be removed evenly, thereby improving the repair quality and efficiency.

[0030] 2. By providing an angle adjustment unit, the blade can be rotated along the central axis, and the rotation angle can be freely controlled by the operator according to the blade tipping and repair situation, ensuring that the curved blade is uniformly smooth and easy to operate after tipping.

[0031] 3. Multiple grooves are provided to match the blade tenon, which allows for a more secure clamping of the blade and ensures that the blade will not deviate during the sharpening process.

[0032] 4. A workbench is provided for operators to support their arms when using the grinding machine, which effectively avoids fatigue caused by long-term operation, ensures repair quality, and improves production efficiency. Attached Figure Description

[0033] The features and advantages of the invention will become more readily apparent from the following description with reference to the accompanying drawings, which are not drawn to scale and some features are enlarged or reduced to show details of specific parts.

[0034] Figure 1 This is a schematic perspective view of a turbine blade sharpening fixture according to an exemplary embodiment of the present invention;

[0035] Figure 2 This is a schematic front view of a turbine blade sharpening clamp according to an exemplary embodiment of the present invention when clamping a turbine blade;

[0036] Figure 3 This is a schematic side view of a turbine blade sharpening clamp according to an exemplary embodiment of the present invention when clamping a turbine blade;

[0037] Figure 4 This is a schematic perspective view of a blade clamping member in a turbine blade sharpening fixture according to an exemplary embodiment of the present invention.

[0038] Figure label:

[0039] 11-Column, 111-Front surface of column, 112-Recess, 12-Worktable;

[0040] 21-Bearing component, 211-U-shaped part, 2111-Crossbar, 2112-First leg, 2113-Second leg, 212-Protruding piece;

[0041] 22-blade clamping component, 221-V-groove, 222-groove;

[0042] 31-Pressure plate, 311-First end of pressure plate, 312-Second end of pressure plate;

[0043] 32-Set screw;

[0044] 33 - Bolt and nut assembly, 331 - Bolt, 332 - Nut;

[0045] 41-Spindle, 42-Knob;

[0046] 100-Turbine blade. Detailed Implementation

[0047] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments thereof. It should be noted that the following detailed description is for illustrative purposes only and is not intended to limit the scope of the invention. Furthermore, the same reference numerals are used to denote the same parts in the various drawings.

[0048] This invention provides a turbine blade sharpening fixture and a turbine blade sharpening method.

[0049] First refer to Figures 1 to 3 The turbine blade sharpening fixture provided by the present invention will be described. Figure 1 This is a schematic perspective view of a turbine blade sharpening fixture according to an exemplary embodiment of the present invention. Figure 2 This is a schematic front view of a turbine blade sharpening clamp according to an exemplary embodiment of the present invention when clamping a turbine blade. Figure 3 This is a schematic side view of a turbine blade sharpening clamp according to an exemplary embodiment of the present invention, when clamping a turbine blade.

[0050] like Figures 1 to 3 As shown, the turbine blade sharpening fixture, which is an exemplary embodiment of the present invention, may include a support unit, a clamping unit, a locking unit, and an angle adjustment unit.

[0051] The support unit can be used to support the clamping unit, the locking unit and the angle adjustment unit and may include a column 11.

[0052] The column 11 can be placed on a horizontal platform to be sharpened, and the column 11 can have a substantially flat, forward-facing surface 111.

[0053] The clamping unit can be used to clamp the turbine blade 100 to be sharpened, and the clamping unit may include a carrier 21 and a blade clamping member 22.

[0054] In some embodiments, the column 11 may have a recess 112 above the portion of the shaft on which the angle adjustment unit is installed, specifically the portion described below, to facilitate the operator's handling of the turbine blade sharpening clamp.

[0055] The carrier 21 may include a U-shaped portion 211, the opening of which is vertically open. It should be understood that the direction in which the opening of the U-shaped portion 211 is open can vary depending on the installation configuration; the vertical direction defined here is for ease of description only. For example, in… Figure 2 In the U-shaped section 211, the opening direction is approximately 30 degrees to the vertical direction. The U-shaped section 211 may have a crossbar 2111 and two legs, namely a first leg 2112 and a second leg 2113.

[0056] In some embodiments of the invention, the carrier 21 may also include a tab portion 212 that projects outward from the free end of the legs of the U-shaped portion 211, particularly the second leg 2113—this is merely an example and not a limitation—specifically, the tab portion 212 may project outward generally normally to the second leg 2113.

[0057] The blade clamping member 22 may be provided with a V-shaped groove 221 for accommodating and clamping the turbine blade 100. Specifically, the blade clamping member 22 may be installed in the U-shaped portion 211 of the carrier member 21 with the opening of the V-shaped groove 221 facing forward. That is, the blade clamping member 22 may contact the crossbar 2111 of the U-shaped portion 211 of the carrier member 21. In addition, one end of the V-shaped end face of the blade clamping member 22 may contact the crossbar 2111 of the U-shaped portion 211 of the carrier member 21, and the other end may extend out or be flush with the upper end of the U-shaped portion of the carrier member 21. The structure of the blade clamping member 22 can be found in [reference needed]. Figure 4 , Figure 4 This is a schematic perspective view of a blade clamping member in a turbine blade sharpening fixture according to an exemplary embodiment of the present invention.

[0058] It should be understood that the dimensions of the blade holder 22 should be designed such that: one end of the tenon of the turbine blade 100 mounted in the blade holder 22 contacts the crossbar 2111 of the U-shaped portion 211 of the carrier 21, and the other end is flush with the upper end of the blade holder 22, thereby enabling the turbine blade 100 to be firmly held and then sharpened.

[0059] like Figure 4As shown, the V-shaped groove 221 of the blade clamping member 22 may be provided with multiple grooves 222 that match the tenons of the turbine blade 100. These grooves 222 can extend along the length of the U-shaped portion 211 of the support member 21, so that the tenons of the turbine blade can be inserted into the V-shaped groove 221 along the grooves 222 and cooperate with the grooves 222, thereby clamping the turbine blade 100 more securely. The present invention provides grooves that match the blade tenons, which enables more secure clamping of the blade and ensures that the blade does not deviate during the sharpening process.

[0060] The locking unit can be used to clamp the blade clamp 22 and may include a pressure plate 31 and a locking screw 32.

[0061] In some embodiments, the pressure plate 31 may be generally rectangular in shape, and the length of the pressure plate 31 in the left-right direction may be designed such that: the first end 311 of the pressure plate 31 may overlap the blade clamping member 22, in particular the first leg 2112 of the U-shaped portion 211 of the carrier member 21, and the second end 312 of the pressure plate 31 may overlap the second leg 2113 of the U-shaped portion 211 of the carrier member 21, in particular the second end 312 of the pressure plate 31 may overlap the protrusion portion 212 of the carrier member 21; the width of the pressure plate 31 in the front-back direction may be designed to be narrower than the width of the protrusion portion 212 of the carrier member 21 in the front-back direction.

[0062] The pressure plate 31 can be detachably connected to the carrier 21. The pressure plate 31 can be connected to the carrier 21 in any known detachable connection manner. For example, the pressure plate 31 can be snap-fitted or threaded to either of the two legs of the carrier 21.

[0063] The pressure plate 31 and the set screw 32 can work together to limit and press the blade clamp 22 into the U-shaped portion 211 of the carrier 21.

[0064] In a specific embodiment of the present invention, the tightening unit may further include a bolt and nut assembly 33. The pressure plate 31 can be connected to the protruding portion 212 via the bolt and nut assembly 33. Specifically, the bolt 331 in the bolt and nut assembly 33 can pass through holes in the pressure plate 31 and the protruding portion 212 of the bearing member 21, and the nut 332 in the bolt and nut assembly 33 can be screwed onto one end of the bolt 331 and contact the pressure plate 31. Preferably, the nut 332 in the bolt and nut assembly 33 can be a wing nut to facilitate the tightening operation by the operator.

[0065] The set screw 32 can pass through the legs of the U-shaped portion 211 of the carrier 21, particularly the first leg 2112—this is only an example and not a limitation—to compress the blade holder 22, specifically by pressing the blade holder 22 in a direction perpendicular to the extension direction of the groove 222 of the blade holder 22, so as to press the blade holder 22 into the carrier 21.

[0066] like Figure 3 As clearly shown, the angle adjustment unit is used to rotate the clamping unit and may include a pivot 41 and a knob 42.

[0067] The rotating shaft 41 can pass through the column 11 in a horizontal direction. The knob 42 can be located on one side of the column 11 and connected to one end of the rotating shaft 41. The carrier 21 can be located on the other side of the column 11 and connected to the other end of the rotating shaft 41. Specifically, the other end of the rotating shaft 41 can be axially positioned using the forward-facing surface 111 of the column 11. The carrier 21 can be welded to the front surface of the rotating shaft 41, but this is not intended to limit the invention. The carrier 21 can also be fixed to the rotating shaft 41 by means of screws or other methods.

[0068] In addition, the bottom of the blade holder 22 can abut against the front surface of the rotating shaft 41 to ensure that the turbine blade 100 is firmly held during the sharpening process.

[0069] The rotating shaft 41 can drive the carrier 21 and the blade clamping member 22 containing the turbine blade 100 to rotate and lock it with the knob 42, thereby allowing the turbine blade 100 to rotate along its central axis and be adjusted to the required angle so that each curved surface of the blade tip can contact the grinding wheel. The turbine blade tipping fixture of the present invention, by providing an angle adjustment unit, enables the blade to rotate along the central axis, and the rotation angle can be freely controlled by the operator according to the blade tipping repair situation, ensuring that the curved blade is uniformly smooth at the thin blade section after tipping and is easy to operate.

[0070] In the embodiment shown in this invention, the knob 42 is a nut with a handle, which is connected to the rotating shaft 41 by a threaded connection, which allows for flexible control of the angle of the turbine blade 100.

[0071] In some optional embodiments of the present invention, the support unit may further include a workbench 12, which may be fixed to the bottom end of the column 11 to support the operator's arm when the operator sharpens the turbine blade 100. This is ergonomically designed, effectively avoids fatigue caused by long-term operation, ensures repair quality, and improves production efficiency.

[0072] In some preferred embodiments, the worktable 12 may be made of bakelite board to insulate it from the coldness of the alloy steel material and prevent discomfort to the operator. Additionally, the worktable 12 may have multiple holes machined into it to secure it to the platform where the sharpening is performed.

[0073] The turbine blade sharpening method provided by the present invention will be described next.

[0074] A turbine blade sharpening method, as an exemplary embodiment of the present invention, may include the following steps:

[0075] Step 1: Remove the pressure plate 31 from the support member 21;

[0076] Step 2: Insert the tenon of the turbine blade 100 to be sharpened into the V-groove 221 of the blade holder 22, specifically insert the tenon of the turbine blade 100 into the V-groove 221 of the blade holder 22 along the groove 222 of the blade holder 22.

[0077] Step 3: Reinstall the pressure plate 31 and tighten the set screw 32 to limit and press the blade clamp 22 with turbine blade 100 in the U-shaped portion 211 of the carrier 21.

[0078] Step 4: Move the grinding wheel back and forth to sharpen the turbine blade 100;

[0079] Step 5: During the sharpening process, rotate the shaft 41 and lock it with the knob 42 to adjust the angle of the turbine blade 100.

[0080] As described above, the turbine blade sharpening fixture and sharpening method provided by the present invention provide a turbine blade with a support unit, a clamping unit and a locking unit to securely clamp the turbine blade. During sharpening repair, by fixing the turbine blade and moving the grinding wheel back and forth, the blade sharpening field of vision is improved. During the sharpening process, the condition of the blade tip thin blade part can be accurately judged, and the relative position of the blade and the grinding wheel can be adjusted at any time to remove material evenly, thereby improving the repair quality and efficiency.

[0081] The features mentioned and / or shown in the foregoing description of exemplary embodiments of the present invention may be combined in the same or similar manner with one or more other embodiments, combined with features in other embodiments, or substituted for corresponding features in other embodiments. Such combinations or substitutions should also be considered as including within the scope of protection of the present invention.

Claims

1. A turbine blade sharpening fixture characterized by It includes a support unit, a clamping unit, a fastening unit and an angle adjustment unit; The support unit is used to support the clamping unit, the fastening unit and the angle adjustment unit and includes a column; The clamping unit is used to clamp the turbine blade to be sharpened and includes a carrier and a blade clamp, The carrier includes a U-shaped part, and the opening of the U-shaped part is open in the vertical direction, The blade clamp is provided with a V-shaped groove for accommodating and clamping the turbine blade; The fastening unit is used to press the blade clamp and includes a pressing plate and a fastening screw, The pressing plate is detachably connected to the carrier. The two ends of the pressing plate respectively overlap on the two legs of the U-shaped part of the carrier. The fastening screw passes through the legs of the U-shaped part of the carrier to squeeze the blade clamp. The pressing plate and the fastening screw jointly limit and press the blade clamp in the U-shaped part of the carrier; The angle adjustment unit is used to rotate the clamping unit and includes a rotating shaft and a knob, The rotating shaft passes through the column in the horizontal direction. The knob is located on one side of the column and is connected to one end of the rotating shaft. The carrier is located on the other side of the column and is connected to the other end of the rotating shaft, The rotating shaft can drive the carrier and the blade clamp therein with the turbine blade to rotate to the required angle and lock it with the knob.

2. The turbine blade sharpening fixture of claim 1, wherein: The carrier further includes a tab portion protruding outward from the free end of the leg of the U-shaped part. The fastening unit further includes a bolt and nut assembly. The pressing plate is connected to the tab portion through the bolt and nut assembly.

3. A turbine blade sharpening jig according to claim 1 or 2, characterised in that: A plurality of grooves matching the tenons of the turbine blade are provided in the V-shaped groove of the blade clamp.

4. The turbine blade sharpening jig of claim 1 or 2, wherein: The support unit further includes a workbench. The workbench is fixed to the column at the bottom end of the column to support the operator's arm when the operator sharpens the turbine blade.

5. The turbine blade sharpening fixture of claim 1 or 2, wherein: The knob is a nut with a handle, and the nut with a handle is connected to the rotating shaft through a threaded fit.

6. The turbine blade sharpening fixture of claim 1 or 2, wherein: The column is provided with a recess above the part where the rotating shaft is installed to facilitate the taking of the turbine blade sharpening fixture.

7. The turbine blade sharpening fixture of claim 4, wherein: The workbench is made of bakelite board.

8. A turbine blade sharpening method for the turbine blade sharpening jig according to any one of claims 1 to 7, characterized by It includes the following steps: Step 1, remove the pressing plate from the carrier; Step 2, insert the tenon of the turbine blade to be sharpened into the V-shaped groove of the blade clamp; Step 3, reinstall the pressing plate and tighten the fastening screw to limit and press the blade clamp with the turbine blade in the U-shaped part of the carrier; Step 4, move the grinding wheel back and forth to sharpen the turbine blade; Step 5, rotate the rotating shaft and lock it with the knob during the sharpening process to adjust the angle of the turbine blade.

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