Compressor rotor blade milling blade body clamp and blade body milling method thereof

Abstract

The invention discloses a gas compressor rotor blade milling blade body clamp and a blade body milling method thereof, and belongs to the technical field of aero-engine gas compressor blade machining. The clamp comprises a connecting disc, a supporting block, a positioning assembly A, a positioning assembly B and a clamping mechanism, the supporting block is arranged on the end face of one end of the connecting disc, the positioning assembly A and the positioning assembly B are both arranged on the supporting block, and the clamping mechanism is movably connected with the positioning assembly B and the supporting block. Two profiling check blocks are symmetrically and detachably connected to the inner side of the clamping mechanism. When the shapes or sizes of the tenons of the to-be-machined compressor rotor blades are different, the to-be-machined compressor rotor blades can be positioned and clamped only by replacing the profiling check blocks, the use flexibility of the clamp is remarkably improved, the clamp does not need to be aligned again, human errors are prevented from being introduced in the clamp replacing process, and the machining efficiency is improved. The machining cost of the clamp is reduced, and the alignment time of the clamp is saved.

Description

Technical Field

[0001] The invention relates to a blade body milling fixture for a compressor rotor blade and a blade body milling method thereof, belonging to the technical field of processing blades for compressors of aircraft engines. Background Art

[0002] like Figure 1 As shown in the figure, the rotor blades of the compressor of an aircraft engine are mainly composed of three parts: the tenon, the blade tip and the blade body. The commonly used materials are titanium alloy and high-temperature alloy. The compressor rotor blades are the rotating parts of the compressor, connected to the rotor of the compressor, and move with the rotation of the rotor to compress the air.

[0003] When using the traditional compressor rotor blade milling method, each time the fixture is replaced, a tedious alignment process is required, which is not only time-consuming and labor-intensive, but also prone to human errors. In addition, the traditional fixture is often designed for specific blade sizes and shapes, lacking flexibility; when blades of different shapes need to be processed, the entire set of fixtures often needs to be replaced, further increasing the fixture processing cost and fixture alignment time. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a blade body milling fixture for a compressor rotor blade and a blade body milling method thereof.

[0005] The present invention is achieved through the following technical solutions: A blade body milling fixture for a compressor rotor blade, the fixture comprising a connecting plate, a support block, a positioning component A, a positioning component B and a clamping mechanism, the support block being arranged on an end face of one end of the connecting plate, the positioning component A and the positioning component B being arranged on the support block, the positioning component A being located on the outside of the support block and being used for positioning the tenon of the compressor rotor blade, the positioning component B being located on the inside of the support block and being used for positioning the end of the tenon away from the blade tip, the clamping mechanism being movably connected to the positioning component B and the support block respectively, the inner side of the clamping mechanism being symmetrically and detachably connected with two profiling blocks, the two profiling blocks being provided with profiling grooves facing each other, and the shape and size of the profiling grooves being adapted to the shape and size of the tenon.

[0006] The support block is connected to the connecting plate through multiple bolts A and connected to the connecting plate through a positioning pin A. A positioning hole A is provided on the connecting plate at a position corresponding to the positioning pin A, and the positioning hole A is coaxially arranged with the connecting plate. A positioning hole B is provided on the support block at a position corresponding to the positioning pin A.

[0007] The support block is provided with a T-shaped slide groove and a positioning groove A. The T-shaped slide groove runs through the support block and is parallel to the end face of the connecting plate. The positioning groove A is arranged perpendicular to the T-shaped slide groove, and one end face of the positioning groove A is coplanar with the transverse large end face of the T-shaped slide groove.

[0008] The positioning assembly B includes a positioning block B and two limiting plates. The positioning block B is provided with a through hole A. The two limiting plates are both arranged on the positioning block B, and the positioning block B is located between the two limiting plates. The limiting plates are provided with a through hole B. The through hole B is coaxially arranged with the through hole A, and the diameter of the through hole B is smaller than the diameter of the through hole A.

[0009] The positioning block B is inserted into the positioning groove A and has an interference fit with the positioning groove A.

[0010] The clamping mechanism includes a screw and two blocks. The middle part of the screw is movably connected to the positioning assembly B. The two blocks are symmetrically arranged and both are threadedly connected to the screw. Both blocks are movably connected to the support block.

[0011] A hexagonal head is provided at one end of the screw rod, and the screw rod includes a coaxially arranged left-handed thread section and a right-handed thread section, one end of the right-handed thread section is connected to one end of the left-handed thread section through a polished rod section, the diameter of the polished rod section is larger than the diameter of the left-handed thread section and the diameter of the right-handed thread section, and the polished rod section is clearance-matched with the through hole A and is located between the two limit plates.

[0012] The stopper includes a T-shaped slider and a mounting plate arranged on the T-shaped slider, the T-shaped slider is provided with a threaded hole, and the T-shaped slider is slidably connected with the T-shaped slide groove; The mounting plate is provided with a positioning groove B, which is arranged perpendicularly to the T-shaped sliding groove, and the positioning grooves B on the two stoppers are arranged face to face.

[0013] The profiling block is connected to the mounting plate via a plurality of bolts B and a plurality of positioning pins B. The profiling block comprises a positioning plate and a clamping plate arranged on the positioning plate. The shape and size of the positioning plate are adapted to the shape and size of the positioning groove B. The profiling groove is arranged on a side of the clamping plate away from the positioning plate.

[0014] The positioning assembly A is located on the same side of the support block and the clamping mechanism. The positioning assembly A includes a Z-shaped bracket and a positioning block A arranged on the Z-shaped bracket. The Z-shaped bracket is arranged on the support block. The positioning block A is arranged away from the support block and is located on one side of the Z-shaped bracket close to the clamping mechanism.

[0015] A method for milling a compressor rotor blade, comprising the following steps: Step 1: Install and fix the fixture to the five-axis machining center, and calibrate the fixture for the first time; Step 2: According to the shape and size of the tenon of the compressor rotor blade, a suitable profiling block is selected, that is, the shape and size of the profiling groove on the profiling block are adapted to the shape and size of the tenon, and the profiling block is installed and fixed to the inner side of the clamping mechanism; Step 3: Place the tenon of the compressor rotor blade into the clamping mechanism and make it rest against the positioning block B and the positioning block A; Step 4: Rotate the screw until the two contoured blocks clamp the tenon tightly; Step 5: Clamp the tip of the compressor rotor blade with a self-centering vise; Step 6: Start the five-axis machining center to perform milling on the blade body of the compressor rotor blade; Step 7: When the shape or size of the tenon of the compressor rotor blade is different, repeat the above steps 2 to 6.

[0016] The beneficial effects of the present invention are as follows: the shape and size of the profiling groove on the profiling block are matched with the shape and size of the tenon of the compressor rotor blade, and except for the profiling block, other parts in the fixture are universal. When the shape or size of the tenon of the compressor rotor blade to be processed is different, it is only necessary to replace the profiling block whose shape and size of the profiling groove are matched with the shape and size of the tenon, so as to realize the positioning and clamping of the compressor rotor blade to be processed, which significantly improves the use flexibility of the fixture, and the fixture only needs to be aligned when processing the first compressor rotor blade, and the fixture does not need to be aligned again after the profiling block is replaced, so as to prevent the introduction of human error in the process of replacing the fixture, reduce the processing cost of the fixture, save the time of fixture alignment, and improve the processing efficiency of the compressor rotor blade, and successfully solve the problem that the five-axis machining center takes a long time to replace the fixture and calibrate and align when processing compressor rotor blades of different shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the structure of a compressor rotor blade; Figure 2 It is a schematic diagram of the assembly structure of the present invention and the compressor rotor blade; Figure 3 It is a structural schematic diagram of the connection disk of the present invention; Figure 4 It is a schematic diagram of the main structure of the support block of the present invention; Figure 5 for Figure 4 Left view of Figure 6 for Figure 4 Rear view of Figure 7 It is a structural schematic diagram of the screw rod of the present invention; Figure 8 It is a structural schematic diagram of the positioning component A of the present invention; Fig. 9 It is a structural schematic diagram of the stopper of the present invention; Fig.10 for Fig. 9 Left view of Fig.11 It is a schematic diagram of the front view structure of the contour stopper of the present invention; Fig.12 for Fig.11 Left view of; Fig.13 It is a structural schematic diagram of the positioning component B of the present invention; Fig.14 for Fig.13 Section view along AA.

[0018] In the figure: 1-compressor rotor blade, 100-tenon, 101-blade body, 102-blade tip, 2-connecting plate, 20-positioning hole A, 3-support block, 30-positioning hole B, 31-T-shaped slide groove, 32-positioning groove A, 4-screw, 40-left-handed threaded section, 41-light rod section, 42-right-handed threaded section, 43-hexagonal head, 5-positioning component A, 50-Z-shaped bracket, 51-positioning block A, 6-stopper, 60-mounting plate, 600-positioning groove B, 61-T-shaped slider, 610-threaded hole, 7-profiling stopper, 70-positioning plate, 71-clamping plate, 710-profiling groove, 8-positioning component B, 80-positioning block B, 800-through hole A, 81-limiting plate, 810-through hole B, 9-bolt B. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0020] like Figures 1 to 14As shown, a compressor rotor blade milling blade body fixture described in the present invention comprises a connecting plate 2, a support block 3, a positioning component A5, a positioning component B8 and a clamping mechanism, the support block 3 is arranged on an end face of one end of the connecting plate 2, the positioning component A5 and the positioning component B8 are both arranged on the support block 3, the positioning component A5 is located on the outer side of the support block 3, and is used to position the tenon 100 of the compressor rotor blade 1, the positioning component B8 is located on the inner side of the support block 3, and is used to position the end of the tenon 100 away from the blade tip 102, the clamping mechanism is movably connected to the positioning component B8 and the support block 3 respectively, and two profiling blocks 7 are symmetrically and detachably connected to the inner side of the clamping mechanism, and profiling grooves 710 are provided face to face on the two profiling blocks 7, and the shape and size of the profiling grooves 710 are adapted to the shape and size of the tenon 100. When in use, the shape and size of the profiling groove 710 on the profiling block 7 are matched with the shape and size of the tenon 100 of the compressor rotor blade 1, and other parts in the fixture are universal except the profiling block 7. When the shape or size of the tenon 100 of the compressor rotor blade 1 to be processed is different, it is only necessary to replace the profiling block 7 whose shape and size of the profiling groove 710 is matched with the shape and size of the tenon 100, so as to realize the positioning and clamping of the compressor rotor blade 1 to be processed, which significantly improves the use flexibility of the fixture, and the fixture only needs to be aligned when processing the first compressor rotor blade 1, and the fixture does not need to be aligned again after the profiling block 7 is replaced, so as to prevent the introduction of human error in the process of replacing the fixture, reduce the processing cost of the fixture, save the time of fixture alignment, and improve the processing efficiency of the compressor rotor blade 1.

[0021] The support block 3 is connected to the connection plate 2 through multiple bolts A and through a positioning pin A. A positioning hole A20 is provided on the connection plate 2 at a position corresponding to the positioning pin A, and the positioning hole A20 is coaxially arranged with the connection plate 2. A positioning hole B30 is provided on the support block 3 at a position corresponding to the positioning pin A. During assembly, the relative positions of the support block 3 and the connection plate 2 are first positioned through the positioning pin A, and then all the bolts A are tightened to fix the support block 3 to the connection plate 2; the positioning pin A improves the assembly accuracy of the support block 3 and the connection plate 2.

[0022] The support block 3 is provided with a T-shaped slot 31 and a positioning slot A32. The T-shaped slot 31 passes through the support block 3 and is parallel to the end face of the connecting plate 2. The positioning slot A32 is arranged perpendicular to the T-shaped slot 31, and one end face of the positioning slot A32 is coplanar with the transverse large end face of the T-shaped slot 31.

[0023] The positioning assembly B8 includes a positioning block B80 and two limiting plates 81. The positioning block B80 is provided with a through hole A800. The two limiting plates 81 are both arranged on the positioning block B80, and the positioning block B80 is located between the two limiting plates 81. The limiting plates 81 are provided with a through hole B810. The through hole B810 is coaxially arranged with the through hole A800, and the diameter of the through hole B810 is smaller than the diameter of the through hole A800.

[0024] The positioning block B80 is inserted into the positioning groove A32 and has an interference fit with the positioning groove A32. The positioning block B80 has an interference fit with the positioning groove A32 to achieve the installation and fixation of the positioning block B80 on the support block 3; the end of the positioning block B80 away from the transverse large end face of the T-shaped slide groove 31 is used to position the tenon 100 of the compressor rotor blade 1.

[0025] The clamping mechanism includes a screw rod 4 and two blocks 6. The middle part of the screw rod 4 is movably connected to the positioning assembly B8. The two blocks 6 are symmetrically arranged and both are threadedly connected to the screw rod 4. The two blocks 6 are both movably connected to the support block 3.

[0026] One end of the screw rod 4 is provided with a hexagonal head 43, and the screw rod 4 includes a left-handed thread segment 40 and a right-handed thread segment 42 arranged coaxially, and one end of the right-handed thread segment 42 is connected to one end of the left-handed thread segment 40 through a polished rod segment 41, and the diameter of the polished rod segment 41 is larger than the diameter of the left-handed thread segment 40 and the diameter of the right-handed thread segment 42, and the polished rod segment 41 is clearance-matched with the through hole A800 and is located between the two limiting plates 81. When in use, the radial direction of the screw rod 4 is limited by the through hole A800, and the axial direction of the screw rod 4 is limited by the two limiting plates 81, so that the screw rod 4 has only the degree of freedom to rotate along the circumferential direction, so that the screw rod 4 is rotatably connected with the positioning block B80.

[0027] The stopper 6 includes a T-shaped slider 61 and a mounting plate 60 disposed on the T-shaped slider 61. The T-shaped slider 61 is provided with a threaded hole 610, and the T-shaped slider 61 is slidably connected to the T-shaped slide groove 31. The mounting plate 60 is provided with a positioning groove B600, which is arranged perpendicularly to the T-shaped slide groove 31, and the positioning grooves B600 on the two stoppers 6 are arranged face to face. When in use, one of the stoppers 6 is threadedly connected to the left-handed thread on the screw rod 4 through the threaded hole 610, and the other stopper 6 is threadedly connected to the right-handed thread on the screw rod 4 through the threaded hole 610; when the screw rod 4 is rotated, the two stoppers 6 simultaneously move toward or away from each other to achieve the clamping or loosening of the tenon 100.

[0028] The profiling block 7 is connected to the mounting plate 60 by a plurality of bolts B9 and a plurality of positioning pins B. The profiling block 7 includes a positioning plate 70 and a clamping plate 71 disposed on the positioning plate 70. The shape and size of the positioning plate 70 match the shape and size of the positioning groove B600. The profiling groove 710 is disposed on the clamping plate 71 on a side away from the positioning plate 70. When in use, the relative position of the profiling block 7 and the mounting plate 60 is first positioned by the positioning pins B, and then all the bolts B9 are tightened to fix the profiling block 7 to the mounting plate 60. The positioning plate 70 is located on the inner side of the positioning groove B600, and the positioning groove B600 plays a positioning role for the positioning plate 70. When it is necessary to replace a different contour block 7 according to the shape or size of the tenon 100 of the compressor rotor blade 1, first remove the bolt B9 and pull out the contour block 7, and then start replacing the new contour block 7, thereby realizing rapid assembly and disassembly of the contour block 7, which is beneficial to reducing replacement time and equipment downtime, and improving the processing efficiency of the compressor rotor blade 1.

[0029] The positioning assembly A5 is located on the same side of the support block 3 and the clamping mechanism. The positioning assembly A5 includes a Z-shaped bracket 50 and a positioning block A51 disposed on the Z-shaped bracket 50. The Z-shaped bracket 50 is disposed on the support block 3. The positioning block A51 is arranged away from the support block 3 and is located on one side of the Z-shaped bracket 50 close to the clamping mechanism. Figure 2 As shown, when in use, the tenon 100 is positioned by the lower end surface of the positioning block A51.

[0030] A method for milling a compressor rotor blade, comprising the following steps: Step 1: Install and fix the fixture to the five-axis machining center and perform the initial calibration and alignment of the fixture.

[0031] Step 2: According to the shape and size of the tenon 100 of the compressor rotor blade 1, select a suitable contour block 7, that is, the shape and size of the contour groove 710 on the contour block 7 are compatible with the shape and size of the tenon 100, and install and fix the contour block 7 to the inner side of the clamping mechanism.

[0032] Step 3: Place the tenon 100 of the compressor rotor blade 1 into the clamping mechanism and make it rest against the positioning block B80 and the positioning block A51. Figure 2 As shown, when in use, the tenon 100 simultaneously abuts against one end of the positioning block B80 away from the transverse large end face of the T-shaped slide groove 31 and the lower end face of the positioning block A51 to ensure that the tenon 100 is in the correct position in the fixture.

[0033] Step 4: Rotate the screw 4 until the two contoured blocks 7 clamp and fix the tenon 100. This ensures the stability and accuracy of the compressor rotor blade 1 during the processing and prevents processing errors caused by vibration or movement.

[0034] Step 5: Clamp the blade tip 102 of the compressor rotor blade 1 with a self-centering vise.

[0035] Step 6: Start the five-axis machining center to perform milling on the blade body 101 of the compressor rotor blade 1.

[0036] Step 7: When the shape or size of the tenon 100 of the compressor rotor blade 1 is different, repeat the above steps 2 to 6. It can be seen that once the fixture is aligned, when a different profiling block 7 is replaced to achieve positioning and clamping of the compressor rotor blade 1, the fixture does not need to be re-aligned, which saves the time of fixture alignment and improves the processing efficiency of the compressor rotor blade 1. Only by replacing the profiling block 7, the fixture can achieve positioning and clamping of the compressor rotor blade 1 with the tenon 100 (straight teeth or arc teeth) of different shapes or sizes.

Claims

1. A blade body milling fixture for compressor rotor blades, characterized in that: The clamp comprises a connecting plate (2), a supporting block (3), a positioning assembly A (5), a positioning assembly B (8) and a clamping mechanism, wherein the supporting block (3) is arranged on an end surface of the connecting plate (2), the positioning assembly A (5) and the positioning assembly B (8) are both arranged on the supporting block (3), the positioning assembly A (5) is located on the outer side of the supporting block (3) and is used to position a tenon (100) of a compressor rotor blade (1), the positioning assembly B (8) is located on the inner side of the supporting block (3) and is used to position an end of the tenon (100) away from a blade tip (102), the clamping mechanism is movably connected to the positioning assembly B (8) and the supporting block (3), and two profiling blocks (7) are symmetrically and detachably connected to the inner side of the clamping mechanism, profiling grooves (710) are provided on the two profiling blocks (7) facing each other, and the shape and size of the profiling grooves (710) are adapted to the shape and size of the tenon (100).

2. The compressor rotor blade milling fixture according to claim 1, characterized in that: The support block (3) is connected to the connection plate (2) via a plurality of bolts A and is connected to the connection plate (2) via a positioning pin A; a positioning hole A (20) is provided on the connection plate (2) at a position corresponding to the positioning pin A, and the positioning hole A (20) is coaxially arranged with the connection plate (2); and a positioning hole B (30) is provided on the support block (3) at a position corresponding to the positioning pin A.

3. The compressor rotor blade milling fixture according to claim 1, characterized in that: The support block (3) is provided with a T-shaped slide groove (31) and a positioning groove A (32). The T-shaped slide groove (31) passes through the support block (3) and is parallel to the end surface of the connecting plate (2). The positioning groove A (32) is arranged perpendicular to the T-shaped slide groove (31), and one end surface of the positioning groove A (32) is coplanar with the transverse large end surface of the T-shaped slide groove (31).

4. The compressor rotor blade milling fixture according to claim 3, characterized in that: The positioning assembly B (8) comprises a positioning block B (80) and two limiting plates (81); the positioning block B (80) is provided with a through hole A (800); the two limiting plates (81) are both arranged on the positioning block B (80), and the positioning block B (80) is located between the two limiting plates (81); the limiting plates (81) are provided with a through hole B (810); the through hole B (810) is coaxially arranged with the through hole A (800), and the diameter of the through hole B (810) is smaller than the diameter of the through hole A (800).

5. The compressor rotor blade milling fixture according to claim 4, characterized in that: The positioning block B (80) is inserted into the positioning groove A (32) and is interference fit with the positioning groove A (32).

6. The compressor rotor blade milling fixture according to claim 4, characterized in that: The clamping mechanism comprises a screw rod (4) and two stoppers (6); the middle portion of the screw rod (4) is movably connected to a positioning assembly B (8); the two stoppers (6) are symmetrically arranged and both are threadedly connected to the screw rod (4); and both stoppers (6) are movably connected to a support block (3).

7. The compressor rotor blade milling fixture according to claim 6, characterized in that: A hexagonal head (43) is provided at one end of the screw rod (4), and the screw rod (4) comprises a left-handed thread section (40) and a right-handed thread section (42) which are coaxially arranged, and one end of the right-handed thread section (42) is connected to one end of the left-handed thread section (40) via a polished rod section (41), and the diameter of the polished rod section (41) is larger than the diameter of the left-handed thread section (40) and the diameter of the right-handed thread section (42), and the polished rod section (41) is clearance-matched with the through hole A (800) and is located between the two limit plates (81).

8. The compressor rotor blade milling fixture according to claim 6, characterized in that: The stopper (6) comprises a T-shaped slider (61) and a mounting plate (60) arranged on the T-shaped slider (61); a threaded hole (610) is arranged on the T-shaped slider (61), and the T-shaped slider (61) is slidably connected to the T-shaped slide groove (31); The mounting plate (60) is provided with a positioning groove B (600), the positioning groove B (600) is arranged perpendicular to the T-shaped sliding groove (31), and the positioning grooves B (600) on the two stoppers (6) are arranged face to face.

9. The compressor rotor blade milling fixture according to claim 8, characterized in that: The profiling block (7) is connected to the mounting plate (60) via a plurality of bolts B (9) and a plurality of positioning pins B. The profiling block (7) comprises a positioning plate (70) and a clamping plate (71) disposed on the positioning plate (70). The shape and size of the positioning plate (70) are adapted to the shape and size of the positioning groove B (600). The profiling groove (710) is disposed on a side of the clamping plate (71) away from the positioning plate (70).

10. The compressor rotor blade milling fixture according to claim 1, characterized in that: The positioning assembly A (5) is located on the same side of the support block (3) and the clamping mechanism. The positioning assembly A (5) comprises a Z-shaped bracket (50) and a positioning block A (51) provided on the Z-shaped bracket (50). The Z-shaped bracket (50) is provided on the support block (3). The positioning block A (51) is arranged away from the support block (3) and is located on a side of the Z-shaped bracket (50) close to the clamping mechanism.

11. A method for milling a blade body of a compressor rotor blade, using the compressor rotor blade milling blade body fixture according to any one of claims 1 to 10, characterized in that: The following steps are involved: Step 1: Install and fix the fixture to the five-axis machining center, and calibrate the fixture for the first time; Step 2, according to the shape and size of the tenon (100) of the compressor rotor blade (1), select a suitable profiling block (7), that is, the shape and size of the profiling groove (710) on the profiling block (7) are adapted to the shape and size of the tenon (100), and install and fix the profiling block (7) to the inner side of the clamping mechanism; Step 3: Place the tenon (100) of the compressor rotor blade (1) into the clamping mechanism and place it against the positioning block B (80) and the positioning block A (51); Step 4: Rotate the screw (4) until the two contoured blocks (7) clamp the tenon (100) firmly; Step 5: Clamp the blade tip (102) of the compressor rotor blade (1) by a self-centering vise; Step 6: Start a five-axis machining center to perform milling on the blade body (101) of the compressor rotor blade (1); Step 7: When the shape or size of the tenon (100) of the compressor rotor blade (1) is different, repeat the above steps 2 to 6.

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