A positioning support fixture for a low-vortex sealing ring and its application method

Abstract

This invention relates to the field of aerospace parts processing technology, specifically to a positioning support fixture for low-vortex sealing rings and its usage method. It addresses the problem of low processing accuracy caused by poor rigidity in the processing of thin-walled sealing parts. The invention includes a ring-shaped stepped fixture base. An annular positioning boss is integrally formed on the upper surface of the fixture base, and a cover plate is provided on the positioning boss to press the part in place. The positioning boss has several U-shaped grooves evenly arranged along its circumference. Several stepped positioning holes and bolt holes are evenly spaced along the circumference on the stepped fixture base inside the positioning steps. Hook-shaped pressure plates are provided on the stepped positioning holes. Several screw positioning grooves and guide grooves are evenly spaced on the large-diameter end of the stepped fixture base. Each screw positioning groove has a pressure plate, and each guide groove has a pressure plate, which presses the outer surface of the part tightly.

Description

Technical Field

[0001] This invention relates to the field of aerospace parts processing technology, specifically to a positioning support fixture for a low-vortex sealing ring and its usage method. Background Technology

[0002] Rotating sealing rings are widely used in the manufacture of front sealing assemblies for low-pressure turbine disks in aero-engines and various sealing ring components. For rotating sealing rings with good rigidity, simple positioning and clamping methods can be used to complete the machining process. However, for thin-walled sealing rings with poor rigidity, conventional positioning fixtures cannot provide effective support for the parts. The parts are greatly affected by cutting forces during machining, especially in thin-walled and less rigid sections, resulting in significant deformation and low machining accuracy.

[0003] Therefore, in order to improve the machining accuracy of thin-walled sealing parts, it is necessary to design new combined positioning support fixtures to improve the reliability of the fit between the sealing parts and the positioning fixtures, thereby improving the positioning status and meeting the machining requirements of the parts. Summary of the Invention

[0004] In view of this, in order to solve the problem of low machining accuracy caused by poor rigidity in the processing of thin-walled sealing parts with poor rigidity, the present invention provides a positioning support fixture for low-vortex sealing rings and its usage method. The fixture provides auxiliary support for the thin-walled and rigid parts of the part, avoiding or reducing the deformation of the part during processing due to poor rigidity, so as to improve the fitting accuracy between the part and the fixture and improve the machining accuracy of the part.

[0005] To address the problems existing in the prior art, the technical solution of the present invention is: a positioning support fixture for a low-vortex sealing ring, comprising an annular stepped fixture base, an annular positioning step integrally provided on the upper surface of the stepped fixture base, and a cover plate provided on the positioning step, which presses the part in place.

[0006] The positioning step is uniformly provided with several "U"-shaped grooves along the circumference. The stepped fixture base on the inner side of the positioning step is uniformly provided with several step positioning holes and bolt holes one along the circumference. Each step positioning hole is provided with a hook-shaped pressure plate. The large-diameter end of the stepped fixture base is uniformly provided with several screw positioning grooves and guide grooves. Each screw positioning groove is provided with pressure plate one, and each guide groove is provided with pressure plate two. The outer circumference of the part is pressed by pressure plate one.

[0007] Furthermore, pressure plate two is an L-shaped pressure plate, with side wings on both sides of its longitudinal plate and an opening groove in the middle downward. Bolt hole three is located at the center of the opening groove, and an adjustment support is installed in bolt hole three. The upper end of the adjustment support is connected to a support block, and the height of the support block can be adjusted by rotating the adjustment support. The upper surface of the transverse plate of pressure plate two is provided with a waist-shaped groove, and the bottom surface is provided with a stepped positioning surface. The stepped positioning surface is respectively engaged with two sealing teeth on the outer circle of the part.

[0008] Furthermore, the cover plate has a ring structure, and stepped holes corresponding to the bolt holes are evenly distributed on the upper surface of the cover plate. U-shaped grooves corresponding to the hook-shaped pressure plate are evenly distributed on the inner circumference of the cover plate, and measuring grooves corresponding to the "U"-shaped grooves are evenly distributed on the outer circumference.

[0009] Furthermore, the pressure plate is a Z-shaped pressure plate, with a waist-shaped groove and connecting holes on its horizontal plate.

[0010] Furthermore, each screw positioning groove has an assembly hole at its front end, a bushing is provided in the assembly hole, and a screw is provided in the bushing; the screw is inserted through the pressure plate, and a second screw is inserted through the rear end of the pressure plate, and the second screw is inserted through the pressure plate and placed in the screw positioning groove.

[0011] Furthermore, each guide groove is provided with a bolt hole 2, and a screw 5 is provided in the bolt hole 2, which is inserted into the pressure plate 2; the upper end of the pressure plate 2 is provided with an adjustment support, and the upper end of the adjustment support is provided with a support block.

[0012] Furthermore, a connecting hole is provided between each pair of screw positioning slots and guide grooves.

[0013] Furthermore, the hook-shaped pressure plate is connected to the positioning hole via three screws.

[0014] Furthermore, a bushing 2 is inserted through bolt hole 1, and a screw 4 is installed inside bushing 2. The screw 4 is inserted through cover plate and connected to bushing 2.

[0015] The steps for using a positioning support fixture for a low-vortex sealing ring are as follows:

[0016] Step 1: Place the stepped fixture base on the CNC vertical lathe worktable, and use screws to pass through the connecting holes on the fixture base to fix the fixture base to the worktable;

[0017] Step 2: When installing the part, place the part horizontally on the fixture, so that the two lower ends of the part are in contact with the upper end of the positioning step on the fixture base. Adjust the position of the first pressure plate so that the front end of the first pressure plate is in contact with the part. Tighten the first screw to firmly press the part onto the positioning step.

[0018] Step 3: Slide the pressure plate 2 along the guide groove toward the center of the fixture, so that the stepped positioning surface of the pressure plate 2 fits with the sealing teeth of the outer circle of the part; tighten screw 5 to fix the pressure plate 2 on the fixture base;

[0019] Step 4: Install a lever dial indicator on the upper surface of the part, gently rotate the adjustment support to raise it, and move the support block upwards together, so that the upper support surface of the support block is in contact with the lower surface of the part. At the same time, monitor the change of the lever dial indicator pointer. While ensuring that the upper support surface of the support block is in contact with the lower surface of the part, the change of the lever dial indicator pointer should not exceed 0.005mm.

[0020] Step 5: Install the hook-shaped pressure plate, making the lower end face of the hook-shaped pressure plate fit against the upper end face of the part, and tighten screw three to make the hook-shaped pressure plate press against the upper end face of the part;

[0021] Step 6: Install the cover plate, place a lever dial indicator in the outer groove of the part, and ensure that the outer circular surface of the cover plate fits against the inner hole surface of the part. Tighten the screws to press the cover plate against the inner surface of the part. Monitor the change in the lever dial indicator needle before and after installing the cover plate, ensuring it does not exceed 0.01mm. Then, install the cutting tool and process the part.

[0022] Compared with the prior art, the advantages of this invention are as follows:

[0023] 1) By setting a pressure plate, the present invention firmly presses the part onto the positioning step at the upper end of the fixture base, so that the rear end face of the part is in close contact with the positioning step, thereby eliminating or reducing the positioning gap between the rear end face of the part and the positioning surface of the fixture, improving the axial fit accuracy between the positioning fixture and the part, and controlling the deformation of the end face of the part during processing.

[0024] 2) This invention provides auxiliary support for the outer sealing of the part by setting a T-shaped pressure plate. By adjusting the position of the T-shaped pressure plate in the guide groove, the inner hole support surface of the T-shaped pressure plate is made to fit with the outer circle of the part's teeth, thereby improving the rigidity of the part's teeth and preventing the part from undergoing large deformation. By adjusting the adjustment support at the upper end of the T-shaped pressure plate, the upper end surface of the support block is made to fit with the lower end surface of the part, providing auxiliary support for the lower end surface of the part and preventing the part from deforming due to downward force when the upper end surface of the part is processed.

[0025] 3) By setting a cover plate, the outer circular surface of the cover plate is designed to match the inner hole surface of the part. After the cover plate is pressed, the inner surface of the cover plate fits well with the inner hole surface of the part, thereby forming an auxiliary support for the inner hole of the part and preventing the part from deforming in the direction of the inner hole when the part is processed. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 for Figure 1 Top view;

[0028] Figure 3 This is a schematic diagram of the base structure of the present invention;

[0029] Figure 4 for Figure 3 F-F sectional view;

[0030] Figure 5 for Figure 2 Sectional view A-A;

[0031] Figure 6 for Figure 2 B-B sectional view;

[0032] Figure 7 for Figure 2 C-C section view;

[0033] Figure 8 for Figure 2 D-D sectional view;

[0034] Figure 9 for Figure 2 E-E sectional view;

[0035] Figure 10 This is a schematic diagram of the cover plate of the present invention; where a is the front view of the cover plate; b is the GG sectional view of figure a;

[0036] Figure 11 This is a schematic diagram of the structure of the pressure plate of the present invention; wherein a is a top view of the pressure plate; b is an HH sectional view of figure a; and c is a perspective view of the pressure plate.

[0037] Figure 12 This is a schematic diagram of the structure of the pressure plate II of the present invention; wherein a is a top view of the pressure plate II; b is a sectional view II of figure a; and c is a perspective view of the pressure plate II.

[0038] Figure 13 This is a schematic diagram of the hook-shaped pressure plate of the present invention; where a is a top view of the hook-shaped pressure plate; b is a cross-sectional view of figure a; and c is a perspective view of the hook-shaped pressure plate.

[0039] Figure 14 Figure 1 is a structural schematic diagram of the part; where a is the top view of the part; and b is the KK sectional view of figure a.

[0040] Explanation of reference numerals in the attached drawings: 1-Clamp base, 2-Positioning step, 3-"U" shaped groove, 4-Positioning hole, 5-Bolt hole one, 6-Screw positioning groove, 7-Assembly hole, 8-Guide groove, 9-Bolt hole two, 10-Connecting hole, 11-Pressure plate one, 12-Screw two, 13-Screw one, 14-Bushing one, 15-Pressure plate two, 16-Screw five, 17-Adjusting support, 18-Support block, 19-Hook-shaped pressure plate, 20-Screw three, 21-Cover plate, 22-Screw four, 23-Bult two, 24-Measuring groove, 25-Step hole, 26-U-shaped groove, 27-Bolt hole three, 28-Part, 29-Lever dial indicator. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0042] This embodiment provides a positioning support fixture for a low-vortex sealing ring, such as Figures 1-13 As shown, the device includes a ring-shaped stepped clamp base 1. An annular positioning step 2 is integrally formed on the upper surface of the stepped clamp base 1. A cover plate 21 is provided on the positioning step 2 to press the part 28. The positioning step 2 is evenly provided with four "U"-shaped grooves 3 along the circumference. Eight step positioning holes 4 and eight bolt holes 5 are evenly spaced along the circumference on the stepped clamp base 1 on the inner side of the positioning step 2. A hook-shaped pressure plate 19 is provided on each step positioning hole 4. Eight screw positioning grooves 6 and eight guide grooves 8 are evenly spaced on the large-diameter end circular surface of the stepped clamp base 1. A pressure plate 11 is provided on each screw positioning groove 6, and a pressure plate 25 is provided on each guide groove 8. The outer circular surface of the part 28 is pressed tightly by the pressure plates 11 and 25.

[0043] Each screw positioning groove 6 has an assembly hole 7 at its front end, a bushing 14 inside the assembly hole 7, and a screw 13 inside the bushing 14. The screw 13 passes through the pressure plate 11, and a screw 2 12 passes through the rear end of the pressure plate 11. The screw 2 12 passes through the pressure plate 11 and is positioned in the screw positioning groove 6.

[0044] Each guide groove 8 has a bolt hole 2 9 at its center, and a screw 5 16 is installed in the bolt hole 2 9. The screw 5 16 passes through the pressure plate 2 15. An adjustment support 17 is provided at the upper end of the pressure plate 2 15, and a support block 18 is provided at the upper end of the adjustment support 17.

[0045] As one implementation method in this embodiment, such as Figure 12As shown, pressure plate 2 15 is an L-shaped pressure plate with side wings on both sides of its longitudinal plate and an opening groove in the middle. A bolt hole 3 27 is provided at the center of the opening groove, and an adjusting support 17 is provided in the bolt hole 3 27. The upper end of the adjusting support 17 is connected to a support block 18. The height of the support block 18 can be adjusted by rotating the adjusting support 17. The upper surface of the transverse plate of pressure plate 2 15 is provided with a waist-shaped groove, and the bottom surface of pressure plate 2 15 is provided with a stepped positioning surface. The stepped positioning surface is respectively engaged with two sealing teeth on the outer circle of part 28. The pressure plate 2 15 is fixed in the guide groove 8 and bolt hole 2 9 of the stepped clamp base 1 by screw 5 16.

[0046] As one implementation method in this embodiment, such as Figure 10 As shown, the cover plate 21 has an annular structure. The upper surface of the cover plate 21 is evenly provided with stepped holes 25 corresponding to the bolt holes 5. The inner circumference of the cover plate 21 is evenly provided with U-shaped grooves 26 corresponding to the hook-shaped pressure plate 19, and the outer circumference is evenly provided with measuring grooves 24 corresponding to the U-shaped grooves 3. The bolt holes 5 are provided with bushings 23, and the bushings 23 are provided with screws 22. The screws 22 are provided in the cover plate 21 and connected to the bushings 23.

[0047] As one implementation method in this embodiment, such as Figure 11 As shown, the pressure plate 11 is a Z-shaped pressure plate, with a waist-shaped groove and connecting holes on its horizontal plate. The pressure plate 11 is fixed to the bushing 14 and screw positioning groove 6 of the stepped fixture base 1 by screws 13 and 12. The bushing 14 is fixed to the stepped fixture base 1 through the assembly hole 7.

[0048] As one implementation method in this embodiment, a connecting hole 10 is provided between each pair of screw positioning grooves 6 and guide grooves 8.

[0049] As one implementation method in this embodiment, such as Figure 13 As shown, the hook-shaped pressure plate 19 is connected to the positioning hole 4 by screw 20. The hook-shaped pressure plate 19 fixes the part between the stepped clamp base 1 and the cover plate 21 by screw 20.

[0050] In one embodiment of this invention, there are 8 screw positioning grooves 6, 8 guide grooves 8, 4 connecting holes 10, 4 "U"-shaped grooves 3, 8 stepped positioning holes 4, and 8 bolt holes 5. There are 8 pressure plates 11, 8 bushings 14, 8 screws 13, 8 screws 12, 8 pressure plates 15, 8 screws 16, 8 adjusting supports 17, 8 support blocks 18, 8 hook-shaped pressure plates 19, 8 screws 20, 8 screws 22, and 8 bushings 23. The cover plate 21 has an annular structure, with 8 evenly distributed stepped holes 25, 8 evenly distributed U-shaped grooves 26, and 4 evenly distributed measuring grooves 24.

[0051] Specific usage method of this invention:

[0052] Step 1: Place the fixture base 1 on the CNC vertical lathe worktable, and fix the fixture base 1 on the worktable by passing screws through the connecting holes 10 provided on the fixture base 1.

[0053] Step 2: When installing the part, place the part horizontally on the fixture, so that the two lower ends of the part are in contact with the upper end of the positioning step 2 on the fixture base 1. Adjust the position of the pressure plate 11 so that the front end of the pressure plate 11 is in contact with the part. Tighten the screw 13 to firmly press the part onto the positioning step 2.

[0054] Step 3: Slide the pressure plate 2 15 along the guide groove 8 toward the center of the fixture, so that the stepped positioning surface of the pressure plate 2 15 fits with the sealing teeth of the outer circle of the part 28; tighten the screw 5 16 to fix the pressure plate 2 15 on the fixture base 1.

[0055] Step 4: Install a lever dial indicator 29 on the upper surface of part 28. Gently rotate the adjusting support 17, which will rise and move the support block 18 upwards, so that the upper support surface of the support block 18 is in contact with the lower surface of part 28. At the same time, monitor the pointer change of the lever dial indicator. While ensuring that the upper support surface of the support block 18 is in contact with the lower surface of part 28, the pointer change of the lever dial indicator 29 shall not exceed 0.005mm.

[0056] Step 5: Install the hook-shaped pressure plate 19, so that the lower end face of the hook-shaped pressure plate 19 fits against the upper end face of the part, and tighten the screws 20 to make the hook-shaped pressure plate 19 press against the upper end face of the part.

[0057] Step 6: Install cover plate 21, set lever dial indicator 29 in the outer groove of part 28, install the outer circular surface of cover plate 21 to fit the inner hole surface of part 28, tighten screw 4 22 to press cover plate 21 against the inner surface of part, monitor the change of the pointer of lever dial indicator 29 before and after installing cover plate 21 to not exceed 0.01mm, install the cutting tool and process the part.

Claims

1. A positioning support fixture for a low-vortex sealing ring, characterized in that: It includes a ring-shaped stepped clamp base (1), and an annular positioning step (2) is integrally provided on the upper surface of the stepped clamp base (1). A cover plate (21) is provided on the positioning step (2) to press the part (28) in place. The positioning step (2) is uniformly provided with several "U"-shaped grooves (3) along the circumferential direction. The step fixture base (1) on the inner side of the positioning step (2) is uniformly provided with several step positioning holes (4) and bolt holes (5) along the circumferential direction. Each step positioning hole (4) is provided with a hook-shaped pressure plate (19). The large diameter end of the step fixture base (1) is uniformly provided with several screw positioning grooves (6) and guide grooves (8). Each screw positioning groove (6) is provided with a pressure plate (11), and each guide groove (8) is provided with a pressure plate (25). The outer circular surface of the part (28) is pressed by the pressure plate (11). The pressure plate 2 (15) is an L-shaped pressure plate. Side wings are provided on both sides of its longitudinal plate, and an opening groove is provided in the middle downward. Bolt hole 3 (27) is provided in the center of the opening groove. Adjustment support (17) is provided in bolt hole 3 (27). Support block (18) is connected to the upper end of adjustment support (17). The height of support block (18) is adjusted by rotating adjustment support (17). Waist-shaped groove is provided on the upper surface of the transverse plate of pressure plate 2 (15). Step positioning surface is provided on the side wings of pressure plate 2 (15). The step positioning surface is respectively in contact with two sealing teeth on the outer circle of part (28). The cover plate (21) is a ring structure. The upper surface of the cover plate (21) is evenly provided with stepped holes (25) corresponding to the bolt hole (5). The inner circumference of the cover plate (21) is evenly provided with U-shaped grooves (26) corresponding to the hook-shaped pressure plate (19), and the outer circumference is evenly provided with measuring grooves (24) corresponding to the "U" shaped groove (3). Each guide groove (8) is provided with a bolt hole 2 (9), and a screw 5 (16) is provided in the bolt hole 2 (9). The screw 5 (16) passes through the pressure plate 2 (15). An adjustment support (17) is provided at the upper end of the pressure plate 2 (15), and a support block (18) is provided at the upper end of the adjustment support (17).

2. The positioning support fixture for a low-vortex sealing ring according to claim 1, characterized in that: The pressure plate (11) is a Z-shaped pressure plate, with a waist-shaped groove and connecting holes provided on its lower horizontal plate.

3. A positioning support fixture for a low-vortex sealing ring according to claim 1 or 2, characterized in that: Each screw positioning groove (6) has an assembly hole (7) at its front end, a bushing (14) is provided in the assembly hole (7), and a screw (13) is provided in the bushing (14); the screw (13) passes through the pressure plate (11), and a screw (12) passes through the rear end of the pressure plate (11). The screw (12) passes through the pressure plate (11) and is positioned in the screw positioning groove (6).

4. A positioning support fixture for a low-vortex sealing ring according to claim 3, characterized in that: A connecting hole (10) is provided between each pair of screw positioning grooves (6) and guide grooves (8).

5. A positioning support fixture for a low-vortex sealing ring according to claim 4, characterized in that: The hook-shaped pressure plate (19) is connected to the positioning hole (4) by screw three (20).

6. A positioning support fixture for a low-vortex sealing ring according to claim 5, characterized in that: A bushing 2 (23) is inserted into the bolt hole 1 (5), and a screw 4 (22) is installed inside the bushing 2 (23). The screw 4 (22) is inserted into the cover plate (21) and connected to the bushing 2 (23).

7. The method of using a positioning support fixture for a low-vortex sealing ring according to claim 6, characterized in that: The steps are as follows: Step 1: Place the stepped fixture base (1) on the CNC vertical lathe worktable and fix the fixture base (1) on the worktable by passing screws through the connecting holes (10) provided on the fixture base (1); Step 2: When installing part (28), place part (28) horizontally on the fixture, so that the two lower ends of part (28) are in contact with the upper end of the positioning step (2) on the fixture base (1), adjust the position of pressure plate (11) so that the front end of pressure plate (11) is in contact with part (28), tighten screw (13) to firmly press part (28) onto positioning step (2); Step 3: Slide the pressure plate 2 (15) along the guide groove (8) toward the center position of the fixture, so that the step positioning surface of the pressure plate 2 (15) fits with the sealing teeth of the outer circle of the part (28); tighten the screw 5 (16) to fix the pressure plate 2 (15) on the fixture base (1); Step 4: Set up a lever dial indicator (29) on the upper surface of part (28), gently rotate the adjustment support (17), the adjustment support (17) rises up, and the support block (18) moves up together, so that the upper support surface of the support block (18) is in contact with the lower surface of part (28), and at the same time monitor the pointer change of the lever dial indicator. While ensuring that the upper support surface of the support block (18) is in contact with the lower surface of part (28), the pointer change of the lever dial indicator (29) does not exceed 0.005mm. Step 5: Install the hook-shaped pressure plate (19) so that the lower end face of the hook-shaped pressure plate (19) fits against the upper end face of the part (28), tighten the screw three (20) so that the hook-shaped pressure plate (19) presses against the upper end face of the part; Step 6: Install the cover plate (21), set the lever dial indicator (29) in the outer groove of the part (28), install the outer circular surface of the cover plate (21) to fit the inner hole surface of the part (28), tighten the screw four (22) to make the cover plate (21) press against the inner surface of the part, monitor the change of the dial indicator (29) before and after installing the cover plate (21) and it should not exceed 0.01mm; then install the cutting tool and process the part.

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