Positioning clamp for combustion chamber swirler and using method of positioning clamp

Abstract

The invention relates to a positioning clamp for a combustor swirler and a using method of the positioning clamp. The problem that existing swirler parts are low in detection efficiency is solved. According to the technical scheme, the clamp comprises a clamp base, a positioning table and a positioning ring are integrally arranged in the center of the clamp base upwards, an annular receding groove is formed in the upper surface of the positioning ring in a downwards-sunken mode, and third bolt positioning holes are formed in the center of the clamp base, the center of the positioning table and the center of the positioning ring; the positioning ring is tightly pressed through the center pressing plate, the first pressing plate and the second pressing plate, and the positioning ring and the part are of a similar structure in appearance; a first triangular measuring groove and a second triangular measuring groove are formed in the positioning table. According to the invention, after the swirler is processed, the distance between the processed surface of the straight part and the standard measuring surface can be directly metered and measured on the processing center, so that whether the size of the processed surface of the part meets the tolerance requirement or not is judged, the preparation and detection time of three-coordinate detection after the part is disassembled is shortened, and the detection efficiency of the part is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of machining parts of aero-engine combustion chamber vortex finders, and in particular to a positioning fixture for a combustion chamber vortex finder and a method for using the same. Background Art

[0002] Combustion chamber vortex finder parts are widely used in the manufacture of various types of aircraft engine combustion chambers and flame tubes. There are a large number of combustion chamber vortex finders in each engine, and the precision of the center size of the vortex finder installation edge is high. This size cannot be directly measured after processing in the machining center, and three-coordinate or projection detection is required. The detection efficiency is low and the detection stability is poor, which is not conducive to improving the processing efficiency of parts. Therefore, in order to improve the processing and detection efficiency of vortex finder parts, it is necessary to design a new positioning fixture and measure it on the fixture to improve the detection efficiency.

[0003] Inventive content

[0004] In view of this, the present invention provides a positioning fixture for a combustion chamber vortex finder and a method of using the same in order to solve the problem of low detection efficiency of existing vortex finder parts. After the vortex finder is processed, the method can directly measure the distance between the machined surface of the straight part and the standard measuring surface on the machining center, thereby determining whether the size of the machined surface of the part meets the tolerance requirements, thereby shortening the preparation and detection time for three-coordinate detection after the parts are disassembled, and effectively improving the detection efficiency of the parts.

[0005] In order to solve the problems existing in the prior art, the technical solution adopted by the present invention is: a positioning fixture for a combustion chamber vortex finder, comprising a circular clamp base, a positioning platform is integrally provided at the center of the clamp base, a protruding positioning ring is integrally provided at the middle of the upper surface of the positioning platform, and an annular avoidance groove is recessed downwardly provided on the upper surface of the positioning ring, a bolt positioning hole three is provided at the center of the clamp base, the positioning platform and the positioning ring, and a part is pressed on the positioning ring through a central pressure plate; two bosses are relatively extended outwardly up and down on the circumference of the positioning ring, and lugs are respectively extended outwardly on the left and right sides; a positioning hole is provided on a positioning platform on one side of a boss, a positioning pin is provided in the positioning hole, and a triangular measuring groove one and a triangular measuring groove two are provided on the lower positioning platform of the two lugs;

[0006] The two sides of the clamp base are symmetrically provided with a pressure plate 1 and a pressure plate 2, through which the two sides of the part are pressed tightly, and the pressure plate 1 and the pressure plate 2 are supported on the clamp base by supporting screws and screws.

[0007] Furthermore, two groups of bolt positioning holes 1 and 2 are symmetrically arranged on the fixture base, support screws are arranged in bolt positioning hole 2 to support pressure plate 1 and pressure plate 2, and screws are arranged in bolt positioning hole 1 to fix pressure plate 1 and pressure plate 2.

[0008] Furthermore, the positioning platform is in an oblate shape with straight-sided structures at the top and bottom, and the first triangular measuring groove and the second triangular measuring groove are respectively arranged on the left and right sides of the positioning platform.

[0009] Furthermore, the shape of the positioning ring is similar to the shape of the processed part.

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

[0011] Furthermore, the first pressing plate and the second pressing plate are hook-shaped pressing plates, and strip grooves are arranged at the bottom.

[0012] Furthermore, a standard measuring side 1 is set on the upper side of triangular measuring slot 1, and the center distance from the standard measuring side 1 to the fixture base is the standard set value required by the part; a standard measuring side 2 is set on the lower side of triangular measuring slot 2, and the center distance from the standard measuring side 2 to the fixture base is the standard set value required by the part.

[0013] A method for using a combustion chamber swirl finder positioning fixture comprises the following steps:

[0014] Step 1: Place the fixture base on the workbench of the CNC machining center, and use screws to pass through the U-shaped grooves set on the fixture base to fix the fixture base on the workbench;

[0015] Step 2: Install the parts, place the parts horizontally on the positioning ring, make the outer end face of the parts fit with the upper end face of the fixture positioning ring, and manually rotate the parts to make the outer boss of the parts fit with the outer circle of the positioning pin;

[0016] Step 3: Adjust the positions of the first and second pressing plates, support the first and second pressing plates on the fixture base through the support screws, and use the screws and nuts to make the first and second pressing plates press the parts tightly;

[0017] Step 4: Install the center cover plate so that the lower end surface of the center cover plate fits with the upper end surface of the part. Install the gasket and the clamping screw in the center cover plate in sequence, so that the clamping screw is inserted into the bolt positioning hole three, and tighten the clamping screw so that the center cover plate presses the upper end surface of the part;

[0018] Step 5: Install the tool and process parts;

[0019] Step 6: After the parts are processed, use the lever dial indicator to measure whether the distance between the standard measuring surface 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 the lever dial indicator to measure whether the distance between the standard measuring surface 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 the present invention are as follows:

[0021] 1) The present invention provides upper and lower pressure plates and a center cover plate to firmly press the part into the annular groove at the upper end of the fixture base, so that the rear end face of the part is tightly fitted with the upper end face of the fixture positioning ring, thereby eliminating or reducing the positioning gap generated between the rear end face of the part and the fixture positioning surface, thereby improving the axial matching accuracy of 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) The present invention converts the positional dimensions of a part processing surface to a part center into the positional dimensions of a standard measuring surface to a fixture center by setting a triangular measuring groove and a standard measuring surface. After the part is processed, the size change from the part processing surface to the standard measuring surface is measured to determine whether the positional dimensions of the part processing surface to the part center meet the requirements of the drawing.

[0023] 3) The present invention converts the position dimension of the second part processing surface relative to the part center into the position dimension of the second standard measuring surface relative to the fixture center by setting two triangular measuring grooves and two standard measuring surfaces. After the part is processed, the size change from the part processing surface to the second standard measuring surface is measured to determine whether the position dimension from the part processing surface to the part center meets the requirements of the drawing. This method is stable and reliable, and the measurement of the position dimension from the part processing surface to the part center can be completed without disassembling the part, which significantly improves the inspection efficiency of the part.

[0024] 4) The present invention designs a standard measuring surface on the fixture. After the parts are processed, the distance between the processed surface of the parts and the standard measuring surface is directly measured on the machine tool to see if it meets the tolerance requirements, thereby determining whether the processed surface of the parts is qualified, avoiding the need to disassemble the parts after processing before three-coordinate detection, thereby improving the parts detection efficiency and further improving the overall parts processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 2 It is a top view of the clamp of the present invention.

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

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

[0029] Figure 5 for Figure 4 Schematic diagram of measurement; a is the standard measuring surface-to-surface measurement diagram; b is the machining surface-to-surface measurement diagram.

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

[0031] Figure 7 for Figure 6 Measurement diagram of the present invention, where a is the measurement diagram of the standard measuring surface 2 and b is the measurement diagram of the machining surface 2.

[0032] Figure 8 It is a schematic diagram of the structure of the pressing plate 1 and the pressing plate 2, wherein a is the main view of the pressing plate 1 and the pressing plate 2, and b is the AA cross-sectional view of the pressing plate 1 and the pressing plate 2.

[0033] Fig. 9 It is a schematic diagram of the center pressure plate structure; a is the main view of the center pressure plate, and b is the BB section view of the part.

[0034] Fig.10 It is a structural schematic diagram of the part, where a is the main view of the part and b is the MM section view of the part.

[0035] Explanation of the accompanying drawings: 1-clamp base, 2-bolt positioning hole one, 3-bolt positioning hole two, 4-step, 5-U-shaped groove, 6-positioning platform, 7-positioning ring, 8-support platform, 9-annular avoidance 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-gasket, 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 DESCRIPTION

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] This embodiment provides a positioning fixture for a combustion chamber vortex finder, such as Figure 1-Figure 4 As shown, it includes a circular clamp base 1, a pressure plate 14, a pressure plate 2 15, a center pressure plate 16, a clamping screw 17, a screw 19 and a supporting screw 21; a step 4 is arranged at the lower end of the circular clamp base 1 for determining the angular position of the clamp base, and U-shaped grooves 5 are evenly arranged on the left and right sides of the circular clamp base 1 for fixing the clamp base 1; an oblate positioning platform 6 is integrally arranged in the middle of the upper surface of the circular clamp base 1, a protruding positioning ring 7 is integrally arranged in the middle of the upper surface of the positioning platform 6, the upper surface of the positioning ring 7 is recessed downward to provide an annular avoidance groove 9, and a protruding support platform 8 is arranged in the middle of the annular avoidance groove 9; bolt positioning hole three 13 is arranged in the center of the clamp base 1, the positioning platform 6 and the positioning ring 7.

[0039] As an implementation method in this embodiment, a part 24 is pressed on the positioning ring 7 through a center pressure plate 16; two bosses extend outward relatively upward and downward on the circumference of the positioning ring 7, and lugs extend outward on the left and right sides respectively. A positioning hole 10 is provided on the positioning platform 6 on one side of a boss, and a positioning pin 23 is provided in the positioning hole 10. A triangular measuring groove 11 and a triangular measuring groove 2 12 are provided on the lower positioning platform 6 of the two lugs. The positioning platform 6 is oblate with straight-edge structures at the top and bottom, and the triangular measuring groove 11 and the triangular measuring groove 2 12 are provided on the left and right sides of the positioning platform 6.

[0040] As an implementation method in this embodiment, the fixture base 1 is symmetrically provided with two groups of bolt positioning holes 2 and bolt positioning holes 3 in the upper and lower parts. The support screw 21 is arranged in the bolt positioning hole 2 to support the pressure plate 14 and the pressure plate 15. The screw 19 is arranged in the bolt positioning hole 23 to fix the pressure plate 14 and the pressure plate 15. The two sides of the parts are pressed by the pressure plate 14 and the pressure plate 15. The pressure plate 14 and the pressure plate 15 are supported on the fixture base 1 by the support screw 21 and the screw 19.

[0041] As an implementation method in this embodiment, the appearance of the positioning ring 7 and the appearance of the processed part 24 are similar in structure.

[0042] As an implementation method in this embodiment, the positioning platform 6 is oval in shape, and the positioning platform 6 has straight-side structures at the top and bottom.

[0043] As an implementation method in this embodiment, the appearance of the positioning ring 7 and the appearance of the processed part 24 are similar in structure;

[0044] As an implementation method in this embodiment, the first pressing plate 14 and the second pressing plate 15 are hook-shaped pressing plates, such as Figure 8As shown, a strip groove is provided at the bottom, and a pressure plate 14 is provided at a position directly above the fixture base 1, and the upper end surface of the part 24 is pressed by means of screws 19, nuts 20 and support screws 21; a pressure plate 2 15 is provided at a position directly below the fixture base 1, and the lower end surface of the part 24 is pressed by means of screws 19, nuts 20 and support screws 21.

[0045] As an implementation method in this embodiment, support screws 21 and screws 19 are respectively passed through bolt positioning hole 1 2 and bolt positioning hole 2 3 , and positioning nuts 22 are respectively provided at the parts where the support screws 21 and screws 19 are connected to the clamp base 1 , and four positioning nuts 22 are provided.

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

[0047] like Figure 5 , Figure 6 , Figure 7 As shown, a method for using a combustion chamber vortex finder positioning fixture comprises the following steps:

[0048] Step 1: Place the fixture base 1 on the workbench of the CNC machining center, and use screws to pass through the U-shaped groove 5 set on the fixture base 1 to fix the fixture base 1 on the workbench;

[0049] Step 2: The lower ring of the installation part 24 is set in the annular avoidance groove 9, and the part 24 is placed horizontally on the positioning ring 7, so that the outer end surface of the part 24 fits with the upper end surface of the fixture positioning ring 7, and the part is manually rotated to make the outer boss of the part 24 fit with the outer circle of the positioning pin 23;

[0050] Step 3: Adjust the positions of the first pressing plate 14 and the second pressing plate 15, support the first pressing plate 14 and the second pressing plate 15 on the fixture base 1 through the support screws 21, and use the screws 19 and nuts 20 to make the first pressing plate 14 and the second pressing plate 15 press the parts tightly;

[0051] Step 4: Install the center cover plate 16 so that the lower end surface of the cover plate fits with the upper end surface of the part, install the gasket 18 and the clamping screw 17 in the center cover plate in sequence, let the clamping screw pass through the bolt positioning hole 3 13, tighten the clamping screw 17, and make the center cover plate 16 press the upper end surface of the part 24;

[0052] Step 5: Install the tool and process parts.

[0053] Step 6: After the parts are processed, use a lever dial indicator to measure whether the distance between the standard measuring surface 25 of the measuring groove 11 and the processed surface 27 of the part 24 meets the tolerance requirements, and determine whether the processed surface 27 of the part 24 is qualified; then use a lever dial indicator to measure whether the distance between the standard measuring surface 26 of the measuring groove 212 and the processed surface 28 of the part 24 meets the tolerance requirements, and determine whether the processed surface 28 of the part 24 is qualified.

[0054] In the above description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed above.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A positioning fixture for a combustion chamber vortex finder, characterized in that: The clamp base (1) comprises a circular annular clamp base, a positioning platform (6) is integrally provided at the center of the clamp base (1), a protruding positioning ring (7) is integrally provided at the middle of the upper surface of the positioning platform (6), and the upper surface of the positioning ring (7) is recessed downward and provided with an annular avoidance groove (9), the clamp base (1), the positioning platform (6) and the positioning ring (7) are centrally provided with bolt positioning holes three (13), and parts are pressed on the positioning ring (7) through a central pressure plate (16); two bosses are relatively extended outwardly on the circumference of the positioning ring (7), and lugs are respectively extended outwardly on the left and right sides; a positioning hole (10) is provided on the positioning platform (6) on one side of a boss, a positioning pin (23) is provided in the positioning hole (10), and a triangular measuring groove one (11) and a triangular measuring groove two (12) are provided on the positioning platform (6) below the two lugs; A first pressing plate (14) and a second pressing plate (15) are symmetrically arranged on both sides of the clamp base (1), and the two sides of the part are pressed by the first pressing plate (14) and the second pressing plate (15). The first pressing plate (14) and the second pressing plate (15) are supported on the clamp base (1) by supporting screws (21) and screws (19).

2. A positioning fixture for a combustion chamber swirler according to claim 1, characterized in that: The clamp base (1) is symmetrically provided with two groups of bolt positioning holes (2) and bolt positioning holes (3), support screws (21) are arranged in the bolt positioning holes (3) to support the first pressing plate (14) and the second pressing plate (15), and screws (19) are arranged in the bolt positioning holes (2) to fix the first pressing plate (14) and the second pressing plate (15).

3. A positioning fixture for a combustion chamber swirler according to claim 1 or 2, characterized in that: The positioning platform (6) is oblate and has straight-sided structures at the top and bottom. The first triangular measuring groove (11) and the second triangular measuring groove (12) are respectively arranged on the left and right sides of the positioning platform (6).

4. A positioning fixture for a combustion chamber swirler according to claim 3, characterized in that: The appearance of the positioning ring (7) and the appearance of the processed part (24) are similar in structure.

5. A positioning fixture for a combustion chamber swirler according to claim 4, characterized in that: A step (4) is provided on one side of the clamp base (1), and U-shaped grooves (5) are symmetrically provided on the left and right sides.

6. A positioning fixture for a combustion chamber swirler according to claim 5, characterized in that: The pressing plate 1 (14) and the pressing plate 2 (15) are hook-shaped pressing plates, and a strip groove is arranged at the bottom.

7. A positioning fixture for a combustion chamber swirler according to claim 6, characterized in that: A standard measuring side 1 (25) is arranged on the upper side of the triangular measuring groove 1 (11), and the distance between the standard measuring side 1 (25) and the center of the fixture base (1) is the standard setting value required by the part; a standard measuring side 2 (26) is arranged on the lower side of the triangular measuring groove 2 (12), and the distance between the standard measuring side 2 (26) and the center of the fixture base (1) is the standard setting value required by the part.

8. The method for using the combustion chamber swirler positioning fixture according to claim 1, characterized in that: The steps are: Step 1: Place the fixture base (1) on the workbench of the CNC machining center, and use screws to pass through the U-shaped grooves (5) provided on the fixture base (1) to fix the fixture base (1) on the workbench; Step 2: Install the part (24), place the part (24) horizontally on the positioning ring (7), make the outer end surface of the part (24) fit with the upper end surface of the fixture positioning ring (7), and manually rotate the part so that the outer boss of the part (24) fits with the outer circle of the positioning pin (23); Step 3: Adjust the positions of the first pressing plate (14) and the second pressing plate (15), support the first pressing plate (14) and the second pressing plate (15) on the fixture base (1) through the support screws (21), and use the screws (19) and nuts (20) to make the first pressing plate (14) and the second pressing plate (15) press the parts tightly; Step 4: Install the center cover plate (16) so that the lower end surface of the center cover plate (16) fits the upper end surface of the component, install the gasket (18) and the clamping screw (17) in the center cover plate (16) in sequence, insert the clamping screw into the bolt positioning hole three (13), tighten the clamping screw (17), and make the center cover plate (16) press against the upper end surface of the component (24); Step 5: Install the tool and process parts; Step 6: After the parts are machined, the distance between the standard measuring surface 1 (25) of the triangular measuring groove 1 (11) and the machined surface 1 (27) of the part (24) is measured by a lever dial indicator to see whether it meets the tolerance requirements, and whether the machined surface 1 (27) of the part (24) is qualified; and the distance between the standard measuring surface 2 (26) of the triangular measuring groove 2 (12) and the machined surface 2 (28) of the part (24) is measured by a lever dial indicator to see whether it meets the tolerance requirements, and whether the machined surface 2 (28) of the part (24) is qualified.

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