A positioning fixture for a combustion chamber vortex generator and its usage method

Abstract

This invention relates to a positioning fixture for a combustion chamber vortex generator and its usage method. It addresses the problem of low inspection efficiency for existing vortex generator parts. The technical solution of this invention includes a fixture base, with a positioning platform and a positioning ring integrally formed at the center of the fixture base. The upper surface of the positioning ring has a downward-facing annular clearance groove. Bolt positioning holes three are provided at the center of the fixture base, positioning platform, and positioning ring. The part is placed on the positioning ring and pressed tightly by a central pressure plate, pressure plate one, and pressure plate two. The positioning ring and the part have similar structures. Triangular measuring groove one and triangular measuring groove two are provided on the positioning platform. After the vortex generator is machined, this invention allows direct measurement of the distance between the machined surface of the part and the standard measuring surface on a machining center, thereby determining whether the dimensions of the machined surface meet the tolerance requirements. This shortens the preparation and inspection time for coordinate measuring machine (CMM) inspection after part disassembly, effectively improving the inspection efficiency of the part.

Description

Technical Field

[0001] This invention relates to the field of machining technology for vortex generator parts in aero-engine combustion chambers, specifically to a positioning fixture for vortex generators in combustion chambers and its usage method. Background Technology

[0002] Combustion chamber vortex generators are widely used in the manufacture of combustion chambers and flame tubes for various types of aero-engines. Each engine contains a large number of combustion chamber vortex generators, and the center-to-center dimension of the vortex generator mounting edge requires high precision. This dimension cannot be directly measured after machining in a machining center and requires coordinate measuring machine (CMM) or projection inspection, which results in low inspection efficiency and poor inspection stability, hindering the improvement of part machining efficiency. Therefore, to improve the machining and inspection efficiency of vortex generator parts, it is necessary to design new positioning fixtures and perform measurements using these fixtures to improve inspection efficiency.

[0003] Invention content

[0004] In view of this, in order to solve the problem of low inspection efficiency of existing vortex generator parts, the present invention provides a positioning fixture for combustion chamber vortex generators and its usage method. After the vortex generator is machined, the distance between the machined surface of the part and the standard measuring edge can be directly measured on the machining center using a dial indicator, thereby determining whether the dimensions of the machined surface of the part meet the tolerance requirements. This shortens the preparation and inspection time for using coordinate measuring machines after the part is disassembled, and effectively improves the inspection efficiency of the part.

[0005] To address the problems existing in the prior art, the technical solution adopted in this invention is as follows: a positioning fixture for a combustion chamber vortex generator, comprising an annular fixture base, a positioning platform integrally provided at the center of the fixture base, a protruding positioning ring integrally provided at the center of the upper surface of the positioning platform, and an annular clearance groove recessed downward on the upper surface of the positioning ring; a bolt positioning hole three is provided at the center of the fixture base, the positioning platform, and the positioning ring; a part is pressed onto the positioning ring by a central pressure plate; two bosses extend outward from each other vertically on the circumference of the positioning ring, and lugs extend outward from the left and right sides respectively; a positioning hole is provided on one side of the positioning platform of one boss, and a positioning pin is provided in the positioning hole; a triangular measuring groove one and a triangular measuring groove two are provided on the lower positioning platform of the two lugs;

[0006] The fixture base is symmetrically provided with pressure plate one and pressure plate two on both sides. The pressure plate one and pressure plate two are used to press the two sides of the part together. The pressure plate one and pressure plate two are supported on the fixture base by support screws and screws.

[0007] Furthermore, the fixture base is symmetrically provided with two sets of bolt positioning holes one and two. Support screws are set in bolt positioning holes two to support pressure plates one and two, and screws are set in bolt positioning holes one to fix pressure plates one and two.

[0008] Furthermore, the positioning platform is a flattened oval shape with straight edges at the top and bottom, and triangular measuring groove one and triangular measuring groove two are respectively set on the left and right sides of the positioning platform.

[0009] Furthermore, the shape of the locating ring is similar to that of the part being processed.

[0010] Furthermore, a step is provided on one side of the fixture base, and U-shaped grooves are symmetrically arranged on the left and right sides.

[0011] Furthermore, pressure plate one and pressure plate two are hook-shaped pressure plates with strip grooves at the bottom.

[0012] Furthermore, a standard measuring side one is set on the upper side of the triangular measuring groove one, and the center distance from the standard measuring side one to the fixture base is the standard setting value required by the part; a standard measuring side two is set on the lower side of the triangular measuring groove two, and the center distance from the standard measuring side two to the fixture base is the standard setting value required by the part.

[0013] The steps of using a positioning fixture for a combustion chamber vortex generator are as follows:

[0014] Step 1: Place the fixture base on the CNC machining center worktable and fix the fixture base to the worktable by passing screws through the U-shaped grooves on the fixture base;

[0015] Step 2: Install the part. Place the part horizontally on the positioning ring so that the outer end face of the part is in contact with the upper end face of the positioning ring of the fixture. Manually rotate the part so that the outer boss of the part is in contact with the outer circle of the positioning pin.

[0016] Step 3: Adjust the position of pressure plate 1 and pressure plate 2, support pressure plate 1 and pressure plate 2 on the fixture base with support screws, and use screws and nuts to press pressure plate 1 and pressure plate 2 into the parts;

[0017] Step 4: Install the center pressure plate, making the lower end face of the center pressure plate fit against the upper end face of the part. Install the shims and clamping screws in the center pressure plate in sequence, so that the clamping screws pass through the bolt positioning hole three. Tighten the clamping screws to make the center pressure plate press against the upper end face of the part.

[0018] Step 5: Install the cutting tools and machine the parts;

[0019] Step 6: After the part is machined, use a lever dial indicator to measure whether the distance between the standard measuring side 1 of the triangular measuring groove 1 and the machined surface 1 of the part meets the tolerance requirements, and determine whether the machined surface 1 of the part is qualified; then use a lever dial indicator to measure whether the distance between the standard measuring side 2 of the triangular measuring groove 2 and the machined surface 2 of the part meets the tolerance requirements, and determine whether the machined surface 2 of the part is qualified.

[0020] Compared with the prior art, the advantages of this invention are as follows:

[0021] 1) By setting upper and lower pressure plates and a central pressure plate, the present invention firmly presses the part into the annular groove at the upper end of the fixture base, so that the rear end face of the part is in close contact with the upper end face of the fixture positioning ring, thereby eliminating or reducing the positioning gap between the rear end face of the part and the positioning surface of the fixture, thereby improving the axial fit accuracy between the positioning fixture and the part, controlling the deformation of the end face of the part during processing, and improving the processing accuracy of the part.

[0022] 2) By setting a triangular measuring groove and a standard measuring edge, the present invention transforms the positional dimensions of a pair of workpiece centers on the workpiece surface into the positional dimensions of a pair of fixture centers on the standard measuring edge. After the workpiece is machined, the change in the dimension from the workpiece surface to the standard measuring edge is measured to determine whether the positional dimensions from the workpiece surface to the workpiece center meet the drawing requirements.

[0023] 3) By setting up a second triangular measuring groove and a second standard measuring side, this invention transforms the positional dimension of the second machining surface of the part relative to the center of the part into the positional dimension of the second standard measuring side relative to the center of the fixture. After the part is machined, the change in dimension from the machining surface of the part to the second standard measuring side is measured to determine whether the positional dimension from the machining surface of the part to the center of the part meets the drawing requirements. This method is stable and reliable, and the measurement of the positional dimension from the machining surface of the part to the center of the part can be completed without disassembling the part, which significantly improves the inspection efficiency of the part.

[0024] 4) This invention designs a standard measuring edge on the fixture. After the part is machined, the distance between the machined surface of the part and the standard measuring edge is directly measured on the machine tool to determine whether the distance meets the tolerance requirements. This determines whether the machined surface of the part is qualified, avoiding the need to disassemble the part after machining before three-coordinate inspection, thereby improving the part inspection efficiency and the overall machining efficiency of the part. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the clamp base of the present invention.

[0026] Figure 2 This is a top view of the fixture of the present invention.

[0027] Figure 3 for Figure 2 C-C section view.

[0028] Figure 4 for Figure 2 D-D sectional view.

[0029] Figure 5 for Figure 4 The measurement diagram is shown below; where a is the measurement diagram of a standard measurement side and a table; b is the measurement diagram of the machined surface.

[0030] Figure 6 for Figure 2 E-E sectional view.

[0031] Figure 7 for Figure 6 The measurement diagrams are shown, where a is the standard measurement side two to the table measurement diagram; b is the machining surface two measurement diagram.

[0032] Figure 8 The diagram shows the structure of pressure plate one and pressure plate two, where a is the front view of pressure plate one and pressure plate two, and b is the AA sectional view of pressure plate one and pressure plate two.

[0033] Figure 9 This is a schematic diagram of the central pressure plate structure; where a is the front view of the central pressure plate and b is the BB sectional view of the part.

[0034] Figure 10 This is a structural schematic diagram of the part, where a is the front view of the part and b is the MM sectional view of the part.

[0035] Explanation of reference numerals in the attached drawings: 1-Clamp base, 2-Bolt positioning hole one, 3-Bolt positioning hole two, 4-Step, 5-U-groove, 6-Positioning platform, 7-Positioning ring, 8-Support platform, 9-Annular clearance groove, 10-Positioning hole, 11-Triangular measuring groove one, 12-Triangular measuring groove two, 13-Bolt positioning hole three, 14-Pressure plate one, 15-Pressure plate two, 16-Center pressure plate, 17-Clamping screw, 18-Washer, 19-Screw, 20-Nut, 20-Support screw, 22-Positioning nut, 23-Positioning pin, 24-Part, 25-Standard measuring edge one, 26-Standard measuring edge two, 27-Machined surface one, 28-Machined surface two. Detailed Implementation

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0038] This embodiment provides a positioning fixture for a combustion chamber vortex generator, such as... Figures 1-4 As shown, the fixture includes a circular clamp base 1, a pressure plate 14, a pressure plate 15, a central pressure plate 16, a clamping screw 17, a screw 19, and a support screw 21. A step 4 is provided at the lower end of the circular clamp base 1 to determine the angular position of the clamp base. U-shaped grooves 5 are evenly distributed on the left and right sides of the circular clamp base 1 to fix the clamp base 1. A flat circular positioning platform 6 is integrally provided in the center of the upper surface of the circular clamp base 1. A protruding positioning ring 7 is integrally provided in the center of the upper surface of the positioning platform 6. An annular clearance groove 9 is recessed downwards on the upper surface of the positioning ring 7. A protruding support platform 8 is provided in the center of the annular clearance groove 9. Bolt positioning holes 13 are provided at the center of the clamp base 1, the positioning platform 6, and the positioning ring 7.

[0039] In one embodiment of this invention, the positioning ring 7 is provided with a part 24 pressed on by a central pressure plate 16; the positioning ring 7 has two protrusions extending outward from each other vertically on its circumference, and lugs extending outward from the left and right sides respectively. A positioning hole 10 is provided on one side of the positioning platform 6 of one protrusion, and a positioning pin 23 is provided in the positioning hole 10. A triangular measuring groove 11 and a triangular measuring groove 22 are provided on the lower part of the positioning platform 6 of the two lugs. The positioning platform 6 is flat and round with straight edges at the top and bottom. The triangular measuring groove 11 and the triangular measuring groove 22 are provided on the left and right sides of the positioning platform 6.

[0040] In one embodiment of this invention, the fixture base 1 is symmetrically provided with two sets of bolt positioning holes 1 2 and bolt positioning holes 2 3. Support screws 21 are provided in the bolt positioning holes 1 2 to support pressure plates 1 4 and 2 15. Screws 19 are provided in the bolt positioning holes 2 3 to fix pressure plates 1 14 and 2 15. The pressure plates 1 14 and 2 15 are used to press the two sides of the part together. The pressure plates 1 14 and 2 15 are supported on the fixture base 1 by the support screws 21 and 19.

[0041] As one implementation method in this embodiment, the shape of the positioning ring 7 is similar to that of the workpiece 24.

[0042] As one implementation method in this embodiment, the positioning platform 6 is flat and round, and the top and bottom of the positioning platform 6 have straight edges.

[0043] As one embodiment of this invention, the shape of the positioning ring 7 is similar to that of the workpiece 24 being processed.

[0044] As one embodiment of this example, pressure plate 14 and pressure plate 15 are hook-shaped pressure plates, such as... Figure 8As shown, a strip groove is provided at the bottom. The first pressure plate 14 is located directly above the fixture base 1 and presses the upper end face of the part 24 with screws 19, nuts 20 and support screws 21. The second pressure plate 15 is located directly below the fixture base 1 and presses the lower end face of the part 24 with screws 19, nuts 20 and support screws 21.

[0045] As one embodiment of this example, support screws 21 and screws 19 are respectively inserted into bolt positioning holes 2 and 3. Positioning nuts 22 are respectively provided at the connection points between the support screws 21 and screws 19 and the fixture base 1. Four positioning nuts 22 are provided.

[0046] As one implementation method in this embodiment, a standard measuring side 25 is provided on the upper side of the triangular measuring groove 11, and the distance from the standard measuring side 25 to the center of the fixture base 1 is the standard setting value required by the part; a standard measuring side 26 is provided on the lower side of the triangular measuring groove 12, and the distance from the standard measuring side 26 to the center of the fixture base 1 is the standard setting value required by the part.

[0047] like Figure 5 , Figure 6 , Figure 7 As shown, the steps of using a positioning fixture for a combustion chamber vortex generator are as follows:

[0048] Step 1: Place the fixture base 1 on the CNC machining center worktable, and fix the fixture base 1 on the worktable by passing screws through the U-shaped groove 5 provided on the fixture base 1;

[0049] Step 2: Install the lower ring of part 24 in the annular relief groove 9, place part 24 horizontally on the positioning ring 7, so that the outer end face of part 24 is in contact with the upper end face of the positioning ring 7, manually rotate the part, so that the outer boss of part 24 is in contact with the outer circle of the positioning pin 23.

[0050] Step 3: Adjust the position of pressure plate 14 and pressure plate 25, support pressure plate 14 and pressure plate 25 on fixture base 1 by support screw 21, and press the parts with pressure plate 14 and pressure plate 25 by screw 19 and nut 20.

[0051] Step 4: Install the center pressure plate 16 so that the lower end face of the cover plate fits against the upper end face of the part. Install the gasket 18 and the clamping screw 17 in the center pressure plate in sequence, so that the clamping screw passes through the bolt positioning hole 3 13. Tighten the clamping screw 17 so that the center pressure plate 16 presses against the upper end face of the part 24.

[0052] Step 5: Install the cutting tools and machine the parts.

[0053] Step 6: After the part is machined, use a lever dial indicator to measure whether the distance between the standard measuring edge 25 of measuring groove 11 and the machined surface 27 of part 24 meets the tolerance requirements, and determine whether the machined surface 27 of part 24 is qualified; then use a lever dial indicator to measure whether the distance between the standard measuring edge 26 of measuring groove 12 and the machined surface 28 of part 24 meets the tolerance requirements, and determine whether the machined surface 28 of part 24 is qualified.

[0054] Many specific details have been set forth in the foregoing description in order to provide a full understanding of the invention. However, the invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed above.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A positioning fixture for a combustion chamber vortex generator, characterized in that: The fixture includes a circular clamp base (1), a positioning platform (6) integrally provided at the center of the clamp base (1), a protruding positioning ring (7) integrally provided at the center of the upper surface of the positioning platform (6), and an annular clearance groove (9) recessed downward on the upper surface of the positioning ring (7). The clamp base (1), the positioning platform (6) and the positioning ring (7) are provided with bolt positioning holes (13) at their centers. Parts are pressed onto the positioning ring (7) by a central pressure plate (16). The positioning ring (7) has two protrusions extending outward from each other on its circumference, and lugs extending outward from its left and right sides respectively. A positioning hole (10) is provided on one side of the positioning platform (6) of one protrusion, and a positioning pin (23) is provided in the positioning hole (10). A triangular measuring groove (11) and a triangular measuring groove (12) are provided on the lower part of the positioning platform (6) of the two lugs. The clamp base (1) is symmetrically provided with pressure plate one (14) and pressure plate two (15) on both sides. The pressure plate one (14) and pressure plate two (15) press the two sides of the part together. The pressure plate one (14) and pressure plate two (15) are supported on the clamp base (1) by support screws (21) and screws (19). The fixture base (1) is symmetrically provided with two sets of bolt positioning holes one (2) and bolt positioning holes two (3). The support screw (21) is set in the bolt positioning hole two (3) to support the pressure plate one (14) and pressure plate two (15). The screw (19) is set in the bolt positioning hole one (2) to fix the pressure plate one (14) and pressure plate two (15). The positioning platform (6) is flat and round with straight edges at the top and bottom. Triangular measuring groove one (11) and triangular measuring groove two (12) are respectively set on the left and right sides of the positioning platform (6). The pressure plate one (14) and pressure plate two (15) are hook-shaped pressure plates with a strip groove at the bottom; The upper side of the triangular measuring groove one (11) is provided with a standard measuring side one (25), and the center distance from the standard measuring side one (25) to the fixture base (1) is the standard setting value required by the part; the lower side of the triangular measuring groove two (12) is provided with a standard measuring side two (26), and the center distance from the standard measuring side two (26) to the fixture base (1) is the standard setting value required by the part.

2. A positioning fixture for a combustion chamber vortex generator according to claim 1, characterized in that: The shape of the positioning ring (7) is similar to that of the workpiece (24).

3. A positioning fixture for a combustion chamber vortex generator according to claim 1 or 2, characterized in that: The fixture base (1) has a step (4) on one side and U-shaped grooves (5) symmetrically arranged on the left and right sides.

4. The method of using a positioning fixture for a combustion chamber vortex generator according to claim 3, characterized in that: The steps are as follows: Step 1: Place the fixture base (1) on the CNC machining center worktable and fix the fixture base (1) on the worktable by passing screws through the U-shaped groove (5) set on the fixture base (1); Step 2: Install part (24). Place part (24) horizontally on the positioning ring (7) so that the outer end face of part (24) fits against the upper end face of the positioning ring (7). Manually rotate part so that the outer boss of part (24) fits against the outer circle of the positioning pin (23). Step 3: Adjust the position of pressure plate 1 (14) and pressure plate 2 (15), support pressure plate 1 (14) and pressure plate 2 (15) on the fixture base (1) by using support screws (21), and use screws (19) and nuts (20) to press the parts with pressure plate 1 (14) and pressure plate 2 (15); Step 4: Install the center pressure plate (16) so that the lower end face of the center pressure plate (16) fits against the upper end face of the part. Install the gasket (18) and the clamping screw (17) in the center pressure plate (16) in sequence, so that the clamping screw passes through the bolt positioning hole three (13), tighten the clamping screw (17) so that the center pressure plate (16) presses against the upper end face of the part (24); Step 5: Install the cutting tools and machine the parts; Step 6: After the part is machined, use a lever dial indicator to measure whether the distance between the standard measuring side (25) of the first triangle measuring groove (11) and the machined surface (27) of the part (24) meets the tolerance requirements, and determine whether the machined surface (27) of the part (24) is qualified; then use a lever dial indicator to measure whether the distance between the standard measuring side (26) of the second triangle measuring groove (12) and the machined surface (28) of the part (24) meets the tolerance requirements, and determine whether the machined surface (28) of the part (24) is qualified.

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