A processing device and method for the serrated surface of the blade crown of an aeroengine turbine blade

Abstract

The present application provides a processing device and method for the serrated surface of the shroud of an aero-engine turbine blade, belonging to the technical field of aero-engine blade processing. Specifically, it includes an angle plate and a clamping assembly. The angle plate is fixed on the base, and the clamping assembly is installed on the upper surface of the angle plate. The clamping assembly is used to clamp the tenon head of the blade. An inclination angle is set on the surface of the angle plate along the inlet and exhaust directions of the blade tenon head, so that the inlet edge end face and the exhaust edge end face of the shroud are in the vertical direction; the shroud serrated surface positioning seat includes a second serrated surface and a third serrated surface. The second serrated surface is used to position the back-radial serrated surface A of the shroud, and the third serrated surface is used to position the back-radial serrated height surface of the shroud; the shroud end face positioning assembly clamps the inlet edge end face and the exhaust edge end face of the shroud; the blade tail positioning assembly is used to position the back profile surface of the blade tail section and the concave profile surface of the blade tail section. Through the processing solution of the present application, the processing accuracy and efficiency are improved.

Description

Technical Field

[0001] The present application relates to the field of aero-engine blade machining, and in particular, to a machining device and method for the serrated surface of the crown of an aero-engine turbine blade. Background Art

[0002] An aero-engine is the "heart" of an aircraft, and turbine blades are key components of an aero-engine. The aero-engine turbine blades are mainly made of nickel-based superalloy materials. The nickel-based superalloy materials have extremely poor machinability. The serrated surface of the crown of the turbine blade is a spatial dihedral angle structure with high precision requirements, and it is a cantilever machining of a slender thin-walled blade, so the machining difficulty is extremely high. The traditional machining method is to cast a low-melting-point alloy square box to machine the radial serrated surfaces of the crown's concave and convex sides.

[0003] The radial surfaces of the crown's concave and convex sides are serrated surfaces with a dihedral angle. For the traditional machining of casting a low-melting-point alloy square box, it is necessary to separately grind the high surfaces of the serrations on the concave and convex sides and then separately mill the low surfaces of the serrations and the serration A surface. Four processes, four sets of measuring tools, and four sets of machining devices are required. The dimensions required by the design drawings are all measured on the square box, resulting in a certain datum conversion error. The traditional machining scheme has low machining efficiency, low machining accuracy, and high cost. Summary of the Invention

[0004] In view of this, the present application provides a machining device and method for the serrated surface of the crown of an aero-engine turbine blade, which solves the problems in the prior art and improves the machining accuracy and efficiency of the crown.

[0005] On the one hand, a machining device for the serrated surface of the crown of an aero-engine turbine blade provided by the present application adopts the following technical solutions:

[0006] A machining device for the serrated surface of the crown of an aero-engine turbine blade includes:

[0007] A base for connecting with a machining device;

[0008] A tenon positioning seat, including an angle plate and a clamping assembly. The angle plate is fixed on the base, and the clamping assembly is installed on the upper surface of the angle plate. The clamping assembly is used to clamp the tenon of the blade. An inclination angle is provided on the surface of the angle plate along the inlet and outlet directions of the blade tenon, so that the inlet edge end face and the exhaust edge end face of the crown are in the vertical direction;

[0009] A crown serrated surface positioning seat is installed on the base. The crown serrated surface positioning seat includes a second serrated surface and a third serrated surface that cooperate with the serrated surface of the crown of the blade. The second serrated surface is used to position the radial serration A surface of the crown's back, and the third serrated surface is used to position the radial serration high surface of the crown's back;

[0010] The blade tip end face positioning assembly includes a first support and a second support, which are respectively located on both sides of the blade tip serrated surface positioning seat. Moving blocks are provided on both the first support and the second support. The moving blocks on the first support and the second support approach each other, and the two moving blocks respectively clamp the inlet edge end face and the exhaust edge end face of the blade tip.

[0011] The blade tail positioning assembly is used to position the blade back profile of the blade tail section and the blade bowl profile of the blade tail section.

[0012] Optionally, the clamping assembly includes a clamping seat and a pressing plate. The clamping seat is installed on the angle plate. The upper surface of the clamping seat has the same inclination angle as the angle plate in the inlet and exhaust direction of the blade tenon. The upper surface of the clamping seat is provided with a downwardly inclined support slope on the side close to the blade tip serrated surface positioning seat. Teeth are provided on the side of the support slope close to the blade tip serrated surface positioning seat, and the teeth are used to position the second tooth groove of the blade tenon tooth. A stepped positioning surface is provided on the upper part of the clamping seat on the side far from the blade tip serrated surface positioning seat. One end of the pressing plate is supported on the stepped positioning surface, and the other end of the pressing plate is provided with a protrusion protruding towards the base. The surface of the protrusion facing the base matches the blade tenon bowl radial surface, and the pressing plate is pressed between the stepped positioning surface and the blade tenon bowl radial surface to press the blade tenon bowl radial surface.

[0013] Optionally, the clamping assembly further includes a stud, a nut and a first spring. A concave hole is provided in the middle of the upper surface of the clamping seat. The stud passes through the pressing plate and is fixedly connected to the bottom of the concave hole. The first spring is sleeved on the outer periphery of the stud. One end of the first spring abuts against the bottom wall of the concave hole and the other end abuts against the pressing plate. The nut is threadedly connected to the stud on the side of the pressing plate facing away from the clamping seat.

[0014] Optionally, a waist-shaped hole for the stud to pass through is provided on the pressing plate, and the waist-shaped hole is arranged along the blade length direction.

[0015] Optionally, the blade tip serrated surface positioning seat further includes a first serrated surface corresponding to the blade tip back radial serrated low surface. A moving hole perpendicular to the first serrated surface and penetrating the first serrated surface is provided in the blade tip serrated surface positioning seat. A second spring and a moving rod protruding from the first serrated surface are provided in the moving hole. A knurled screw penetrating into the moving hole and abutting against the moving rod is provided on the blade tip serrated surface positioning seat.

[0016] Optionally, pressing screws are provided on both the first support and the second support. The pressing screws pass through the first support and the second support respectively, and the ends of the pressing screws on the first support and the second support close to each other are fixedly connected to the moving blocks.

[0017] Optionally, the bottoms of the first support and the second support are fixed to the base by bolts, and arc-shaped grooves for fixing bolts to pass through are provided at the bottoms of the first support and the second support.

[0018] Optionally, the blade tail positioning assembly includes a suction-side profile positioning member and a pressure-side profile positioning member. The suction-side profile positioning member includes a suction-side positioning seat, a rotating top block, and a profile top block. The pressure-side profile positioning member includes a pressure-side positioning seat, a rotating pressing block, and a profile pressing block. The suction-side positioning seat and the pressure-side positioning seat are arranged opposite to each other with respect to the blade, and the suction-side positioning seat and the pressure-side positioning seat are fixed to the base;

[0019] A first groove is provided on the upper surface of the suction-side positioning seat. The rotating top block includes a control rod and a top rod. The control rod is placed in the first groove. One end of the control rod extends out of the first groove on the side away from the pressure-side positioning seat. The top rod is connected to the end of the control rod close to the pressure-side positioning seat. The top rod extends from the control rod to the suction side away from the base. One end of the control rod close to the top rod is rotatably connected to the inner wall of the first groove through a pin shaft. A first bolt is provided on the suction-side positioning seat and passes through the side wall of the first groove to abut against the control rod. A second groove is provided at the end of the top rod away from the control rod. The profile top block is partially located in the second groove. The profile top block is rotatably connected to the inner wall of the second groove through a pin shaft. A second bolt is provided on the top rod and passes through the side wall of the second groove to abut against the profile top block. The profile top block is provided with an arc-shaped surface matching the suction-side profile of the tail section;

[0020] A third groove is provided on the upper surface of the pressure-side positioning seat. The rotating pressing block includes a connecting rod, an adjusting rod, and a pressing rod. One end of the connecting rod is located in the third groove, and the other end extends to the side opposite to the suction-side positioning seat. The connecting rod is rotatably connected to the third groove through a pin shaft. The adjusting rod is connected to the end of the connecting rod away from the suction-side positioning seat and extends to the base side. A third bolt is provided at the end of the adjusting rod away from the connection and passes through the connection to abut against the pressure-side positioning seat. The pressing rod is connected to the end of the connecting rod close to the suction-side positioning seat and extends to the pressure side away from the base. The profile pressing block is connected to the end of the pressing rod away from the connecting rod through a pin shaft. The profile pressing block is provided with an arc-shaped surface matching the pressure-side profile of the tail section.

[0021] Optionally, the bottom surface of the base is set to an angular surface that is consistent with the radial angle of the blade shroud.

[0022] On the other hand, a processing method for the serrated surface of the blade shroud of an aeroengine turbine blade provided by the present application adopts the following technical solution:

[0023] A processing method for the serrated surface of the blade shroud of an aeroengine turbine blade includes:

[0024] Step 1: Install the diamond roller for machining the radial serrated surface of the blade shroud into the roller shaft of the CNC grinding machine;

[0025] Step 2: Install the grinding wheel for machining the radial serrated surface of the blade shroud into the main shaft of the CNC grinding machine;

[0026] Step 3: Install the above-mentioned processing device on the workbench surface of the CNC grinding machine, align the processing device, and fix the position of the processing device on the workbench;

[0027] Step 4: Install the blade into the processing device;

[0028] Step 5: Retrieve the CNC grinding and dressing program for the radial serrated surface of the blade shroud, and dress the shape of the grinding wheel with the diamond roller;

[0029] Step 6: Retrieve the CNC grinding processing program for the radial serrated surface of the blade shroud, and machine the radial serrated surface of the blade shroud with the grinding wheel.

[0030] In summary, the present application includes the following beneficial technical effects:

[0031] The present application positions the tenon head, blade shroud, and tail cross-section, improving the processing stability of the serrated surface of the turbine blade shroud, achieving the one-time forming processing of the radial serrated surfaces of the shroud basin and back respectively, and improving the processing accuracy;

[0032] The bottom end of the base of the present application is designed as an angular surface that is consistent with the radial angle of the blade shroud, used to offset the included angle between the radial serrated surface of the shroud and the axial plane of the shroud, so that when machining the radial surface of the shroud, it is not affected by the angular surface, improving the processing accuracy;

[0033] The upper end of the angle plate of the present application is designed with a surface, which, after being assembled with the base, is used to offset the included angle between the axial plane of the blade shroud and the symmetry plane of the tenon head, so that during machining, the end faces of the inlet and exhaust edges of the shroud are in the vertical position. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a schematic diagram of the overall structure of the processing device of the present application;

[0036] Figure 2 It is a schematic diagram of the structure of the processing device of the present application from another perspective;

[0037] Figure 3 It is a schematic diagram of the installation structure of the pressing plate of the present application;

[0038] Figure 4 Schematic diagram of the installation structure of the movable rod of the present application;

[0039] Figure 5 Schematic diagram of the structure of the blade tail positioning component of the present application;

[0040] Figure 6 Schematic diagram of the structure of the crown sawtooth surface positioning seat of the present application;

[0041] Figure 7 is Figure 2 An enlarged schematic diagram of part A in

[0042] Explanation of reference numerals: 1, clamping seat; 2, pressing plate; 3, angle plate; 4, positioning ball pin; 5, base; 51, stepped surface; 6, nut; 7, stud; 8, first spring; 9, blade; 81, concave hole; 101, tooth; 11, stepped positioning surface; 23, crown sawtooth surface positioning seat; 2301, first serrated surface; 30, movable rod; 32, second spring; 21, knurled screw; 2302, second serrated surface; 2303, third serrated surface; 13, first support; 14, second support; 16, movable pressing block; 15, pressing screw; 131, arc groove; 26, back positioning seat; 24, rotating top block; 241, first groove; 242, second groove; 25, first bolt; 29, second bolt; 243, control rod; 244, ejector rod; 28, profiled surface top block; 17, basin positioning seat; 18, rotating pressing block; 181, third groove; 185, third bolt; 182, adjusting rod; 183, connecting rod; 184, pressing rod; 19, profiled surface pressing block. Detailed implementation manners

[0043] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0044] The following illustrates the implementation manners of the present application through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope protected by the present application.

[0045] Note that the following description relates to various aspects of embodiments within the scope of the appended claims. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on this application, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement a device and / or practice a method. Additionally, this device and / or method can be implemented using other structures and / or functionality in addition to one or more of the aspects described herein.

[0046] It should also be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of this application. Only the components related to this application are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in its actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0047] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the aspects described can be practiced without these specific details.

[0048] An embodiment of this application provides a processing device for the serrated surface of the shroud of an aeroengine turbine blade.

[0049] As Figure 1 - Figure 2 shown, a processing device for the serrated surface of the shroud of an aeroengine turbine blade includes:

[0050] A base 5 for connecting to a processing device. On both sides of the middle of the upper end of the base 5, step surfaces 51 with the same degree as the bottom surface of the base are respectively designed for fixing and pressing the process device to the workbench of the CNC grinding machine.

[0051] A tenon positioning seat, including an angle plate 3 and a clamping assembly. The angle plate 3 is fixed on the base 5, and the clamping assembly is installed on the upper surface of the angle plate 3. The clamping assembly is used to clamp the tenon of the blade 9. An inclination angle is set on the upper surface of the angle plate 3 along the inlet and outlet directions of the tenon of the blade 9, so that the inlet edge end face and the exhaust edge end face of the shroud are in the vertical direction. In an embodiment of this application, the angle of the angle plate 3 along the inlet and outlet directions of the tenon of the blade 9 is designed to be 8°, which is used to offset the 8° angle between the axis plane of the shroud of the blade 9 and the symmetry plane of the tenon, so that the inlet edge end face of the shroud and the exhaust edge end face of the shroud are in the plumb position during processing. At the same time, a cylindrical step hole, a through hole, and a threaded hole are designed at the upper end of the angle plate 3 for positioning and fixing with the base 5 and the clamping assembly respectively.

[0052] As Figure 4 andFigure 6 As shown, the positioning seat 23 for the serrated surface of the blade tip is installed on the base 5. The positioning seat for the serrated surface of the blade tip includes a second serrated surface 2302 and a third serrated surface 2303 that cooperate with the serrated surface of the blade tip. The second serrated surface 2302 is used to position the A surface of the back radial serrations of the blade tip, and the third serrated surface 2303 is used to position the high surface of the back radial serrations of the blade tip.

[0053] As Figure 6 shown, the positioning assembly for the end face of the blade tip includes a first support 13 and a second support 14, which are respectively located on both sides of the positioning seat for the serrated surface of the blade tip. The first support 13 and the second support 14 are both provided with movable pressing blocks 16. The movable pressing blocks 16 on the first support 13 and the second support 14 are close to each other, and the two movable pressing blocks 16 respectively clamp the intake side end face and the exhaust side end face of the blade tip.

[0054] As Figure 5 shown, the positioning assembly for the tail of the blade 9 is used to position the back profile of the cross section of the tail of the blade 9 and the bowl profile of the cross section of the tail of the blade 9, realizing the positioning and support of the cross section of the tail of the blade 9, and increasing the rigidity and stability of the cantilever machining of the serrated surface of the blade tip of the blade 9.

[0055] As Figure 2 and Figure 7 shown, the clamping assembly includes a clamping seat 1 and a pressing plate 2. The clamping seat 1 is installed on the angle plate 3. The upper surface of the clamping seat 1 and the angle plate 3 are provided with the same inclination angle in the inlet and outlet direction of the blade tenon. The upper surface of the clamping seat 1 is provided with a downward inclined support slope on the side close to the positioning seat 23 for the serrated surface of the blade tip. The support slope is provided with teeth 101 on the side close to the positioning seat 23 for the serrated surface of the blade tip. The teeth 101 are used to position the second tooth groove of the tenon teeth of the blade 9 (the second tooth groove refers to the second tooth groove in the direction from the blade tip to the tenon head), and cooperate with the positioning seat 23 for the serrated surface of the blade tip to realize reliable positioning of the tenon teeth of the blade 9 and the side of the radial surface of the blade tip.

[0056] The upper part of the clamping seat 1 is provided with a step positioning surface 11 on the side far from the positioning seat 23 for the serrated surface of the blade tip. The step positioning surface 11 serves as the supporting surface of the pressing plate 2. One end of the pressing plate 2 is supported on the step positioning surface 11, and the other end of the pressing plate 2 is provided with a protrusion protruding towards the base 5. The surface of the protrusion facing the base 5 matches the bowl radial surface of the tenon head of the blade 9. The pressing plate 2 is pressed between the step positioning surface 11 and the bowl radial surface of the tenon head of the blade 9 to press the bowl radial surface of the tenon head of the blade 9.

[0057] As Figure 3As shown, the clamping assembly further includes a stud 7, a nut 6 and a first spring 8. A concave hole 81 is provided in the middle of the upper surface of the clamping seat 1. The stud 7 passes through the pressing plate 2 and is fixedly connected to the bottom of the concave hole 81. The first spring 8 is sleeved on the outer periphery of the stud 7. One end of the first spring 8 abuts against the bottom wall of the concave hole 81 and the other end abuts against the pressing plate 2. The nut 6 is threadedly connected to the stud 7 on the side of the pressing plate 2 facing away from the clamping seat 1. Tightening the nut 6 presses the pressing plate 2 against the stepped positioning surface 11 and the radial surface of the tenon head of the blade 9, pressing the radial surface of the tenon head of the blade 9 to achieve reliable pressing of the radial surface of the tenon head.

[0058] A waist-shaped hole for the stud 7 to pass through is provided on the pressing plate 2. The waist-shaped hole is arranged along the length direction of the blade 9, and the pressing position can be adjusted according to the actual processing situation.

[0059] As Figure 4 and Figure 6 As shown, the crown sawtooth surface positioning seat 23 further includes a first sawtooth surface 2301 corresponding to the low surface of the back radial sawtooth of the crown. An activity hole perpendicular to the first sawtooth surface 2301 and penetrating the first sawtooth surface 2301 is provided in the crown sawtooth positioning seat. A second spring 32 and an activity rod 30 protruding from the first sawtooth surface 2301 are provided in the activity hole. A knurled screw 21 that penetrates into the activity hole and abuts against the activity rod 30 is provided on the crown sawtooth surface positioning seat 23. After adjusting the activity rod 30, tighten the knurled screw 21 to fix the activity rod 30.

[0060] A positioning ball pin 4 is designed at one end of the crown sawtooth surface positioning seat 23 facing away from the tenon positioning seat, which is used for detecting the relevant assembly dimensions in the process device.

[0061] As Figure 1 and Figure 2 As shown, compression screws 15 are provided on both the first support 13 and the second support 14. The compression screws 15 pass through the first support 13 and the second support 14 respectively. The ends of the compression screws 15 on the first support 13 and the second support 14 that are close to each other are fixedly connected to the movable pressing block 16.

[0062] The bottoms of the first support 13 and the second support 14 are fixed to the base 5 by bolts. An arc-shaped groove 131 for the fixing bolts to pass through is provided at the bottoms of the first support 13 and the second support 14. It is used to adjust the pressing position of the end faces of the crown inlet and exhaust edges according to the actual situation of part processing.

[0063] As Figure 1 、 Figure 2 and Figure 5As shown, the tail positioning assembly of the blade 9 includes a back blade surface positioning member and a front blade surface positioning member. The back blade surface positioning member includes a back blade positioning seat 26, a rotating top block 24, and a profile top block 28. The front blade surface positioning member includes a front blade positioning seat 17, a rotating pressing block 18, and a profile pressing block 19. The back blade positioning seat 26 and the front blade positioning seat 17 are oppositely arranged with respect to the blade 9, and the back blade positioning seat 26 and the front blade positioning seat 17 are fixed on the base 5.

[0064] A first groove 241 is provided on the upper surface of the back blade positioning seat 26. The rotating top block 24 includes a control rod 243 and a top rod 244. The control rod 243 is placed in the first groove 241, and there is a gap between the control rod 243 and the bottom of the first groove 241 to ensure the mobility of the control rod 243. One end of the control rod 243 extends out of the first groove 241 on the side away from the front blade positioning seat 17. The top rod 244 is connected to the end of the control rod 243 close to the front blade positioning seat 17. The top rod 244 extends from the control rod 243 to the back blade side away from the base 5. The end of the control rod 243 close to the top rod 244 is rotatably connected to the inner wall of the first groove 241 through a pin shaft. A first bolt 25 is provided on the back blade positioning seat 26, which passes through the side wall of the first groove 241 and abuts against the control rod 243. The first bolt 25 is threadedly connected to the back blade positioning seat 26. A second groove 242 is provided at the end of the top rod 244 away from the control rod 243. Part of the profile top block 28 is located in the second groove 242. The profile top block 28 is rotatably connected to the inner wall of the second groove 242 through a pin shaft. A second bolt 29 is provided on the top rod 244, which passes through the side wall of the second groove 242 and abuts against the profile top block 28. The second bolt 29 is threadedly connected to the top rod 244. The profile top block 28 is provided with an arc surface matching the back blade surface of the tail section.

[0065] A third groove 181 is provided on the upper surface of the front blade positioning seat 17. The rotating pressing block 18 includes a connecting rod 183, an adjusting rod 182, and a pressing rod 184. One end of the connecting rod 183 is located in the third groove 181, and the other end extends to the side away from the back blade positioning seat 26. The connecting rod 183 is rotatably connected to the third groove 181 through a pin shaft. The adjusting rod 182 is connected to the end of the connecting rod 183 away from the back blade positioning seat 26 and extends towards the base 5. A third bolt 185 is provided at the end of the adjusting rod 182 away from the connection, and the third bolt 185 passes through the connection and abuts against the front blade positioning seat 17. The pressing rod 184 is connected to the end of the connecting rod 183 close to the back blade positioning seat 26 and extends to the front blade side away from the base 5. The profile top block 28 is connected to the end of the pressing rod 184 away from the connecting rod 183 through a pin shaft. The profile top block 28 is provided with an arc surface matching the front blade surface of the tail section. The profile top block 28 is provided with a limiting groove that is engaged with the front blade top edge, and the limiting groove is continuous with the arc surface of the profile top block 28.

[0066] By adjusting the control rod 243 and the adjusting rod 182, the distance between the enlarged profile top block 28 and the profile pressing block 19 is adjusted so that the blade 9 can be normally positioned by the tenon locating seat and the crown serrated surface locating seat 23. Adjust the control rod 243 to control the ejector rod 244 to drive the profile pressing block 19 close to the back of the blade. Tighten the first bolt 25. By rotating the profile top block 28, make the profile top block 28 fit the back blade profile as completely as possible, and then tighten the second bolt 29 to fix the angle and position of the profile top block 28. Rotate the third bolt 185 to adjust the pressure rod 184 to drive the profile pressing block 19 to fit the blade basin profile.

[0067] The bottom surface of the base 5 is set as an angular surface that is consistent with the radial angle of the blade 9 crown. In the embodiment of the present application, the bottom end of the base 5 is designed as a 2.15° angular surface that is consistent with the radial angle of the blade 9 crown, which is used to offset the 2.15° included angle between the radial serrated surface of the crown and the crown axis plane, so that when machining the radial surface of the crown, it is not affected by the angular surface and the machining accuracy is improved.

[0068] In the processing device of the present application, since the 2.15° included angle between the radial serrated surface of the blade 9 crown and the crown axis plane and the 8° included angle between the crown axis plane of the blade 9 and the tenon symmetric plane are eliminated, the space dihedral angle is converted into machining on the same plane, realizing the one-time forming machining of the radial serrated surface of the crown. Since the design of the processing device eliminates the above two angles, the profiles of the radial serrated surfaces of the basin and the back are the same, and the same diamond roller can be used to grind the grinding wheel, and the ground grinding wheel is used to process the radial serrated surfaces of the crown basin and the back respectively.

[0069] The present application also discloses a method for machining the serrated surface of the crown of an aeroengine turbine blade.

[0070] A method for machining the serrated surface of the crown of an aeroengine turbine blade includes:

[0071] Step 1: Install the diamond roller for machining the radial serrated surface of the crown into the roller shaft of the CNC grinding machine.

[0072] Step 2: Install the grinding wheel for machining the radial serrated surface of the crown into the main shaft of the CNC grinding machine.

[0073] Step 3: Install the above-mentioned processing device on the workbench surface of the CNC grinding machine, align the processing device, and fix the position of the processing device on the workbench surface;

[0074] Step 4: Install the blade into the processing device.

[0075] Step 5: Retrieve the CNC grinding and dressing program for the radial serrated surface of the blade crown, and dress the shape of the grinding wheel with the diamond roller.

[0076] Step 6: Retrieve the CNC grinding program for the radial serrated surface of the blade crown, and machine the radial serrated surface of the blade crown with the grinding wheel.

[0077] In one embodiment, a method for machining the serrated surface of an aeroengine turbine blade crown includes

[0078] Step 1: Install the diamond roller for machining the crown convex radial serrated surface onto the roller shaft of the CNC grinding machine.

[0079] Step 2: Install the grinding wheel for machining the crown convex radial serrated surface onto the main shaft of the CNC grinding machine.

[0080] Step 3: Place the machining device for machining the crown convex radial serrated surface of the turbine blade on the worktable surface of the CNC grinding machine, align the machining device, ensure that the perpendicularity of the machining device to the machine tool spindle in the X and Y directions is ≤ 0.02 (checked with a dial indicator), and fix the position of the machining device on the worktable surface.

[0081] Step 4: Install the blade into the machining device, ensuring that the clearance between the positioning surfaces of the machining device and the blade positioning surfaces is ≤ 0.02 (checked with a feeler gauge).

[0082] Step 5: Retrieve the CNC grinding dressing program for the crown convex radial serrated surface of the blade and dress the shape of the grinding wheel with the diamond roller.

[0083] Step 6: Retrieve the CNC grinding machining program for the crown convex radial serrated surface of the blade and machine the crown convex radial serrated surface of the blade with the grinding wheel.

[0084] Step 7: During machining, check the flushing position of the coolant, the position and angle of the cooling nozzle, ensure that the coolant is concentratedly flushed to the lowest point of the grinding wheel, i.e., the machining area of the crown serrated surface, and ensure sufficient cooling.

[0085] Step 8: After machining, remove the blade and dry it with an air gun.

[0086] Step 9: Detect the size of the serrated surface with a special measuring tool for the crown convex radial serrated surface of the blade.

[0087] Step 10: Record the quality files such as the machining dimensions of the blade.

[0088] Step 11: Gently place the blade into a clean parts box.

[0089] Step 12: Perform the machining of the crown serrated surface of the next blade according to Steps 4 to 11 above.

[0090] For the machining method of the present application, the average machining time per piece is 10 minutes, which is 10 minutes less than the traditional machining method (the average machining time per piece is 20 minutes), and the machining efficiency is increased by 50%.

[0091] The machining method of the present application can be widely applied to the machining of various blades and is suitable for small-batch, single-batch, and large-batch production.

[0092] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A processing device for the serrated surface of the shroud of an aero-engine turbine blade, characterized in that, it includes: A base for connecting with processing equipment; A tenon positioning seat, including an angle plate and a clamping component. The angle plate is fixed on the base, and the clamping component is installed on the upper surface of the angle plate. The clamping component is used to clamp the tenon of the blade. An inclination angle is set on the surface of the angle plate along the inlet and exhaust direction of the blade tenon, so that the inlet edge end face and the exhaust edge end face of the shroud are in the vertical direction; A shroud serrated surface positioning seat is installed on the base. The shroud serrated surface positioning seat includes a second serrated surface and a third serrated surface that cooperate with the serrated surface of the shroud of the blade. The second serrated surface is used to position the back radial serrated surface A of the shroud, and the third serrated surface is used to position the back radial serrated high surface of the shroud. The shroud serrated surface positioning seat also includes a first serrated surface corresponding to the back radial serrated low surface of the shroud. An activity hole perpendicular to the first serrated surface and passing through the first serrated surface is provided in the shroud serrated surface positioning seat. A second spring and an activity rod protruding from the first serrated surface are provided in the activity hole. A knurled screw that penetrates into the activity hole and abuts against the activity rod is provided on the shroud serrated surface positioning seat; A shroud end face positioning component, including a first support and a second support, which are respectively located on both sides of the shroud serrated surface positioning seat. Activity pressing blocks are provided on both the first support and the second support. The activity pressing blocks on the first support and the second support approach each other, and the two activity pressing blocks respectively clamp the inlet edge end face and the exhaust edge end face of the shroud; A blade tail positioning component for positioning the back profile of the blade tail section and the concave profile of the blade tail section.

2. The processing device for the serrated surface of the shroud of an aero-engine turbine blade according to claim 1, characterized in that, The clamping component includes a clamping seat and a pressing plate. The clamping seat is installed on the angle plate. The upper surface of the clamping seat has the same inclination angle as the angle plate in the inlet and exhaust direction of the blade tenon. A downwardly inclined support slope is provided on the upper surface of the clamping seat on the side close to the shroud serrated surface positioning seat. Teeth are provided on the side of the support slope close to the shroud serrated surface positioning seat. The teeth are used to position the second tooth groove of the tenon tooth of the blade. A step positioning surface is provided on the upper part of the clamping seat on the side far from the shroud serrated surface positioning seat. One end of the pressing plate is supported on the step positioning surface, and a protrusion protruding towards the base is provided at the other end of the pressing plate. The surface of the protrusion facing the base matches the concave radial surface of the blade tenon. The pressing plate is pressed between the step positioning surface and the concave radial surface of the blade tenon to press the concave radial surface of the blade tenon.

3. The processing device for the serrated surface of the shroud of an aero-engine turbine blade according to claim 2, characterized in that, The clamping assembly further includes a stud, a nut, and a first spring. A concave hole is provided in the middle of the upper surface of the clamping seat. The stud passes through the pressing plate and is fixedly connected to the bottom of the concave hole. The first spring is sleeved on the outer periphery of the stud. One end of the first spring abuts against the bottom wall of the concave hole and the other end abuts against the pressing plate. The nut is threadedly connected to the stud on the side of the pressing plate facing away from the clamping seat.

4. The machining device for the serrated surface of the shroud of an aero-engine turbine blade according to claim 3, characterized in that a waist-shaped hole for the stud to pass through is provided on the pressing plate, and the waist-shaped hole is arranged along the length direction of the blade.

5. The machining device for the serrated surface of the shroud of an aero-engine turbine blade according to claim 1, characterized in that pressing screws are provided on both the first support and the second support. The pressing screws pass through the first support and the second support respectively. The ends of the pressing screws on the first support and the second support that are close to each other are fixedly connected to the movable pressing blocks.

6. The machining device for the serrated surface of the shroud of an aero-engine turbine blade according to claim 5, characterized in that the bottoms of the first support and the second support are fixed to the base by bolts, and arc-shaped grooves for the fixing bolts to pass through are provided at the bottoms of the first support and the second support.

7. The machining device for the serrated surface of the shroud of an aero-engine turbine blade according to claim 1, characterized in that the blade tail positioning assembly includes a back blade surface positioning member and a blade concave surface positioning member. The back blade surface positioning member includes a back blade positioning seat, a rotating top block, and a profile top block. The blade concave surface positioning member includes a blade concave surface positioning seat, a rotating pressing block, and a profile pressing block. The back blade positioning seat and the blade concave surface positioning seat are arranged opposite to each other with respect to the blade. The back blade positioning seat and the blade concave surface positioning seat are fixed to the base; a first groove is provided on the upper surface of the back blade positioning seat. The rotating top block includes a control rod and a top rod. The control rod is placed in the first groove. One end of the control rod extends out of the first groove on the side away from the blade concave surface positioning seat. The top rod is connected to the end of the control rod close to the blade concave surface positioning seat. The top rod extends from the control rod to the back blade side away from the base. The end of the control rod close to the top rod is rotatably connected to the inner wall of the first groove through a pin shaft. A first bolt is provided on the back blade positioning seat and passes through the side wall of the first groove to abut against the control rod. A second groove is provided at the end of the top rod away from the control rod. The profile top block is partially located in the second groove. The profile top block is rotatably connected to the inner wall of the second groove through a pin shaft. A second bolt is provided on the top rod and passes through the side wall of the second groove to abut against the profile top block. The profile top block is provided with an arc-shaped surface matching the back blade surface of the tail section. The upper surface of the blade basin positioning seat is provided with a third groove. The rotary pressing block includes a connecting rod, an adjusting rod and a pressing rod. One end of the connecting rod is located in the third groove, and the other end extends towards the side away from the blade back positioning seat. The connecting rod is rotationally connected to the third groove through a pin shaft. The adjusting rod is connected to the end of the connecting rod away from the blade back positioning seat and extends towards the base. A third bolt is provided at the end of the adjusting rod away from the connection, and the third bolt passes through the connection and abuts against the blade basin positioning seat. The pressing rod is connected to the end of the connecting rod close to the blade back positioning seat and extends towards the side away from the base to the blade basin side. The profiled surface top block is connected to the end of the pressing rod away from the connecting rod through a pin shaft, and an arc surface matching the blade basin profiled surface of the tail section is provided on the profiled surface top block.

8. The processing device for the serrated surface of the blade crown of an aero-engine turbine blade according to claim 1, characterized in that, the bottom surface of the base is set as an angular surface consistent with the radial angle of the blade crown.

9. A processing method for the serrated surface of the blade crown of an aero-engine turbine blade, characterized in that, comprising: Step 1: Install the diamond roller for processing the radial serrated surface of the blade crown basin on the roller shaft of the CNC grinding machine; Step 2: Install the grinding wheel for processing the radial serrated surface of the blade crown basin on the main shaft of the CNC grinding machine; Step 3: Install the processing device according to any one of claims 1-8 above on the workbench surface of the CNC grinding machine, align the processing device, and fix the position of the processing device on the workbench surface; Step 4: Install the blade into the processing device; Step 5: Retrieve the CNC grinding dressing program for the radial serrated surface of the blade crown basin, and dress the shape of the grinding wheel with the diamond roller; Step 6: Retrieve the CNC grinding processing program for the radial serrated surface of the blade crown basin, and process the radial serrated surface of the blade crown basin with the grinding wheel.

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