Space curved surface composite material outer cover assembly riveting clamp and riveting method thereof

Abstract

The invention relates to a riveting clamp and a riveting method for a space curved surface composite material outer cover assembly. A plurality of single-face adhesive tapes are prepared, a composite material outer cover to be riveted and a metal inner shell are assembled in a matched mode, countersunk head rivets are assembled according to correct rivet hole positions, and countersunk head faces are sealed on the composite material outer cover through the adhesive tapes; the outer cover assembly assembled with the countersunk head rivet is placed on the profile of a riveting clamp supporting abutting seat, and the placing position is adjusted to be correct according to the marking position of the clamp; according to the distribution positions of the rivets on the metal inner shell, filler strips are sequentially placed, and it is guaranteed that holes in the filler strips are concentric with the rivets; a riveting clamp pressing strip is arranged through the guide column and is fastened by a hexagon socket cap screw; an electric wrench and a screwdriver head are used for applying force to the adjusting nut with the hole on the pressing strip of the riveting clamp to push the guide sleeve base to press the surface of the titanium alloy inner shell through the filler strip, and the composite outer cover and the titanium alloy inner shell are adjusted to be attached, and the molded surface of the composite outer cover and the abutting molded surface of the riveting clamp supporting abutting base are adjusted to be attached. And a handheld pneumatic riveting hammer is used, and a punch of the riveting hammer is inserted into the perforated adjusting nut and the guide sleeve seat on the pressing strip of the riveting clamp for hammering and riveting.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature alloy diffusion welding, and in particular to a riveting fixture for a space curved surface composite material outer cover component and a riveting method thereof. Background Art

[0002] The composite outer cover and titanium alloy inner shell of a certain spatial curved outer cover component are riveted by countersunk rivets, and the countersunk rivet end is not allowed to protrude from the outer cover wall. Due to the difficulty in preparing and processing the composite outer cover, there are uneven wall thickness and profile deformation, and the titanium alloy inner shell also has profile deformation. When the component structure is riveted, the composite outer cover and the titanium alloy inner shell have poor profile fit. At the same time, due to the spatial curved surface deformation of the composite outer cover and the profile of the riveting fixture, there is a gap between the abutting profile of the riveting fixture after the rivet is assembled, causing the rivet head to protrude from the wall. In addition, there is a gap between the composite outer cover and the titanium alloy inner shell, which seriously affects the riveting quality and efficiency. In actual production, the riveting assembly gap needs to be adjusted by the gasket method for each riveting. Usually, 2-3 workers cooperate in the operation, one person installs the adjustment gasket, one person adjusts the position of the workpiece, or one person installs the fixture strip. The workers have high labor intensity and low efficiency, which is not suitable for factory batch riveting production. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a riveting fixture for a space curved composite material outer cover assembly and a riveting method thereof; the specific technical solution is as follows:

[0004] A riveting fixture for a space curved composite material outer cover assembly, the riveting fixture comprising a supporting seat, a bead A, a bead B, a bead C, a bead D, a bead E, a guide column, a hexagon socket head screw, a pad A, a pad B, a pad C, a pad D, a pad E, a guide sleeve seat, an adjustment nut with a hole and a rivet gun punch;

[0005] The pressure strips A, B, C, D and E are all provided with installation holes for installing guide sleeves and adjusting nuts with holes.

[0006] The mounting hole is divided into an upper threaded hole and a lower smooth hole, and the upper threaded hole of the mounting hole is provided with a guide groove;

[0007] The guide sleeve seat is provided with a guide ear, and the guide ear of the guide sleeve seat controls its own movement direction through the guide groove;

[0008] Gasket strips A, B, C, D and E are arranged at the wave valleys of the metal inner shell where the countersunk rivets are distributed;

[0009] Ensure that the bottom end surface acts on the inner surface of the metal inner shell through gasket strips A, B, C, D and E;

[0010] The adjustment nut with holes is installed at the upper end of the guide sleeve seat, and the displacement of the guide sleeve seat is adjusted by applying pressure through an electric wrench, a screwdriver bit and the adjustment nut with holes;

[0011] Pressure is applied to one side of the metal inner shell through the holed adjusting nuts and guide sleeve seats on the pressure strips A, B, C, D and E in the riveting fixture to adjust the assembly gap between the composite outer cover and the metal inner shell. At the same time, the wall surface of the composite outer cover shell is also fitted with the supporting seat surface of the riveting fixture.

[0012] The preferred embodiment of the riveting fixture for a spatial curved composite material outer cover assembly is that the thickness of the pads A, B, C, D and E is equal to the minimum height of the countersunk rivet.

[0013] The preferred embodiment of the riveting fixture for a spatial curved composite material outer cover assembly is that the number of mounting holes provided on the bead A, bead B, bead C, bead D, and bead E corresponds to the number of countersunk rivets.

[0014] A riveting method for a riveting fixture of a space curved surface composite material outer cover assembly comprises the following steps:

[0015] Step 1: Prepare some single-sided tape, assemble the composite material outer cover to be riveted with the metal inner shell, install the countersunk rivets according to the correct rivet hole position, and seal the countersunk surface on the composite material outer cover with tape to prevent the rivets from falling off;

[0016] Step 2: Place the outer cover assembly with countersunk rivets on the support and seat surface of the riveting fixture. The support and seat surface is consistent with the outer surface of the composite material outer cover. Adjust the placement position according to the fixture marking position;

[0017] Step 3: Place gasket strips A, B, C, D and E in sequence according to the distribution positions of the countersunk rivets on the metal inner shell, and ensure that the holes on gasket strips A, B, C, D and E are concentric with the rivets;

[0018] Step 4: Install the bead A, bead B, bead C, bead D and bead E on the guide column on the support seat in sequence and fasten them with hexagon socket head screws;

[0019] Step 5: Prepare a handheld pneumatic riveting hammer and connect the pneumatic power source; use an electric wrench and an electric wrench bit to twist the hole adjustment nuts on the riveting fixture bead A, bead B, bead C, bead D, and bead E. The hole adjustment nuts quickly load pressure to make the guide sleeve seat press the surface of the titanium alloy inner shell through pads A, B, C, D, and E, and adjust the composite material outer cover and the titanium alloy inner shell to fit together, and the composite material outer cover profile and the riveting fixture support seat abutment profile fit together; complete the work content of the assembly fixture before riveting the parts;

[0020] Step 6: Select a suitable pneumatic riveting hammer tool, conduct riveting tests on test pieces with equal structures, and determine the riveting process parameters;

[0021] Use a handheld pneumatic riveting hammer, insert the rivet hammer punch into the hole-adjusting nut and guide sleeve seat on the riveting fixture bead A, bead B, bead C, bead D, bead E to perform hammer riveting;

[0022] Step 7: Repeat the work in step 6 to complete the riveting of the outer cover assembly.

[0023] Compared with the prior art, the present invention has the following beneficial technical effects:

[0024] The technical solution of the present invention adds an adjustable hole-adjusting nut and a guide sleeve seat loading pressure mechanism to the riveting fixture strip, and adds a whole pad strip at the trough of the inner shell where the rivets are distributed. The thickness of the pad strip is equal to the minimum height of the rivet forming. The pressure is loaded on one side of the titanium alloy inner shell through the hole-adjusting nut and the guide sleeve seat on the riveting fixture strip to adjust the assembly gap between the composite material outer cover and the titanium alloy inner shell. At the same time, the wall surface of the composite outer cover shell is also fitted with the supporting and abutting surface of the riveting fixture, thereby solving the problem of the outer cover assembly being affected by the deformation of a single piece and affecting the riveting quality, meeting the riveting process requirements, improving the riveting quality of parts, solving the problem of low riveting efficiency when multiple people are operating, and meeting the requirements of the design drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the front view of the composite material outer cover assembly;

[0026] Figure 2 : It is a top view of the composite material outer cover;

[0027] Figure 3 It is a P-direction view of the composite material outer cover component;

[0028] Figure 4 This is the main view of the riveting fixture;

[0029] Figure 5 It is the top view of the riveting fixture;

[0030] Figure 6 This is the AA section view of the riveting fixture;

[0031] Figure 7 To support the main view of the seat;

[0032] Figure 8 A top view of the support seat;

[0033] Fig. 9 A side view of the support seat;

[0034] Fig.10 This is the main view of the partial assembly of the layering;

[0035] Fig.11 This is a side view of the partial assembly of the layering strip;

[0036] Fig.12 This is a D-direction schematic diagram of the local assembly of the layering strip;

[0037] Fig.13 This is the F-direction schematic diagram of the local assembly of the layering strip;

[0038] Fig.14 It is the AA section view of the local assembly of the layering;

[0039] Fig.15 This is a schematic diagram of the partial assembly of the layering strip in direction B;

[0040] Fig.16 This is a C-direction schematic diagram of the local assembly of the layering strip;

[0041] Fig.17 This is the front view of the electric wrench bit;

[0042] Fig.18 This is the right view of the electric wrench bit;

[0043] Fig.19 This is the left view of the electric wrench bit.

[0044] In the figure: 1-composite material outer cover, 2-metal inner shell, 3-countersunk rivet, 4-support butt, 5-layer A, 6-layer B, 7-layer C, 8-layer D, 9-layer E, 10-guide column, 11-hexagon socket head screw, 12-pad A, 13-pad B, 14-pad C, 15-pad D, 16-pad E, 17-guide sleeve, 18-adjusting nut with hole, 19-rivet gun punch, 20-electric wrench bit, 21-guide ear, 22-guide groove. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-19 The present invention is described in detail, but the protection scope of the present invention is not limited by the accompanying drawings.

[0046] A riveting fixture for a space curved composite material outer cover assembly, the riveting fixture comprising a support butt 4, a bead A5, a bead B6, a bead C7, a bead D8, a bead E9, a guide column 10, a hexagon socket head screw 11, a pad A12, a pad B13, a pad C14, a pad D15, a pad E16, a guide sleeve seat 17, a holed adjustment nut 18 and a rivet gun punch 19;

[0047] The pressure strips A5, B6, C7, D8 and E9 are all provided with installation holes for installing the guide sleeve seat 17 and the adjustment nut 18 with holes.

[0048] The mounting hole is divided into an upper threaded hole and a lower smooth hole, and the upper threaded hole of the mounting hole is provided with a guide groove;

[0049] The guide sleeve seat 17 is provided with a guide ear, and the guide ear of the guide sleeve seat 17 controls its own movement direction through the guide groove;

[0050] Gasket strips A12, B13, C14, D15 and E16 are provided at the wave valleys of the metal inner shell 2 where the countersunk rivets 3 are distributed;

[0051] Ensure that the bottom end surface acts on the inner surface of the metal inner shell 2 through the gasket strips A12, B13, C14, D15 and E16;

[0052] The hole-adjusting nut 18 is installed at the upper end of the guide sleeve seat 17, and the displacement of the guide sleeve seat 17 is adjusted by applying pressure through the electric wrench, the screwdriver bit and the hole-adjusting nut 18;

[0053] Pressure is applied to one side of the metal inner shell 2 through the holed adjustment nuts 18 and the guide sleeve seat 17 on the beading strips A5, B6, C7, D8 and E9 in the riveting fixture to adjust the assembly gap between the composite outer cover 1 and the metal inner shell 2. At the same time, the wall surface of the composite outer cover shell 1 is also made to fit with the surface of the support seat 4 of the riveting fixture.

[0054] The thickness of the gasket strips A12 , B13 , C14 , D15 and E16 is equal to the minimum height of the countersunk rivet 3 .

[0055] The number of mounting holes provided on the bead A5, bead B6, bead C7, bead D8 and bead E9 corresponds to the number of the three countersunk rivets.

[0056] Embodiment 1:

[0057] Taking a composite outer cover assembly as a riveting example, it is composed of a composite outer cover 1 and a metal inner shell 2 riveted together, such as Figure 1 , Figure 2 , Figure 3 The composite material outer cover 1 has a spatial curved surface structure, the main body is a composite material, the thickness is 5.5 mm, and the actual manufacturing thickness error is up to 1 mm; the metal inner shell 2 is a multi-ribbed sheet metal forming part, the main body is TC4 material, and the thickness is 0.8 mm; the composite material outer cover 1 and the metal inner shell 2 are riveted together by countersunk rivets 3, and the riveting method includes the following steps:

[0058] Step 1: Assemble the outer cover components, the composite outer cover 1, the metal inner shell 2 and the countersunk rivets 3;

[0059] Step 2: Prepare tools, prepare a handheld pneumatic riveting hammer 1 and connect the pneumatic power source; prepare an electric wrench and a wrench bit; prepare a number of single-sided tapes for assembling rivets; prepare composite material test pieces and titanium alloy material test pieces of the same thickness as the outer cover component structure;

[0060] Step 3: Use a pneumatic riveting hammer to conduct riveting tests on the same structure test pieces to determine the riveting process parameters;

[0061] Step 4: Assemble the composite material outer cover 1 to be riveted with the metal inner shell 2, install the rivets according to the correct rivet hole positions, and seal the countersunk surface on the composite material outer cover with tape to prevent the rivets from falling off;

[0062] Step 5: Place the outer cover assembly of the countersunk rivet 3 on the surface of the support seat 4 of the riveting fixture, and adjust the placement position according to the marking position of the fixture;

[0063] Step 6: Place the gasket strips A12, B13, C14, D15 and E16 in sequence according to the distribution positions of the countersunk rivets 3 on the metal inner shell 2, and ensure that the holes on the gasket strips A12, B13, C14, D15 and E16 are concentric with the rivets;

[0064] Step 7: Install the riveting fixture bead A5, bead B6, bead C7, bead D8, bead E9 through the guide column 10 and tighten them with the hexagon socket head screw 11;

[0065] Step 8: Use an electric wrench and an electric wrench bit 20 to tighten the hole adjustment nuts 18 on the riveting fixture beading strips A5, B6, C7, D8, and E9 to push the guide sleeve seat 17, load on the pads A12, B13, C14, D15, and E16 to press the surface of the titanium alloy inner shell, adjust the position of the countersunk rivet 3 to fit the composite material outer cover 1 and the titanium alloy inner shell, and fit the profile of the composite material outer cover 1 and the abutting profile of the riveting fixture support butt 4;

[0066] Step 9: Use a handheld pneumatic riveting hammer, insert the rivet hammer punch 8 into the guide hole of the riveting fixture bead A5, bead B6, bead C7, bead D8, bead E9 with hole adjustment nut 18, and perform hammer riveting;

[0067] Step 10: Repeat the work in step 9 to complete the riveting of the outer cover assembly.

Claims

1. A riveting fixture for a space curved composite material cover assembly, characterized in that: The riveting fixture comprises a supporting seat (4), a pressure strip A (5), a pressure strip B (6), a pressure strip C (7), a pressure strip D (8), a pressure strip E (9), a guide column (10), a hexagon socket head screw (11), a pad A (12), a pad B (13), a pad C (14), a pad D (15), a pad E (16), a guide sleeve seat (17), a holed adjustment nut (18) and a rivet gun punch (19); The pressure strips A (5), B (6), C (7), D (8) and E (9) are all provided with mounting holes for mounting guide sleeves (17) and holed adjustment nuts (18). The mounting hole is divided into an upper threaded hole and a lower smooth hole, and the upper threaded hole of the mounting hole is provided with a guide groove; The guide sleeve seat (17) is provided with a guide ear, and the guide ear of the guide sleeve seat (17) controls its own movement direction through the guide groove; A gasket strip A (12), a gasket strip B (13), a gasket strip C (14), a gasket strip D (15) and a gasket strip E (16) are arranged at the wave valley of the titanium alloy inner shell (2) where the countersunk rivets (3) are distributed; Ensure that the bottom end surface acts on the inner surface of the titanium alloy inner shell (2) through the pad A (12), pad B (13), pad C (14), pad D (15) and pad E (16); The hole-adjusting nut (18) is installed on the upper end of the guide sleeve seat (17), and the displacement of the guide sleeve seat (17) is adjusted by applying pressure through an electric wrench, a screwdriver bit and the hole-adjusting nut (18); By applying pressure to one side of the titanium alloy inner shell (2) through the hole-adjusting nuts (18) and the guide sleeve seat (17) on the pressure strips A (5), B (6), C (7), D (8) and E (9) in the riveting fixture, the assembly gap between the composite material outer cover (1) and the titanium alloy inner shell (2) is adjusted, and at the same time, the wall surface of the composite outer cover shell (1) is also made to fit with the surface of the support seat (4) of the riveting fixture.

2. The riveting fixture for a space curved composite material outer cover assembly according to claim 1, characterized in that: The thickness of the gasket strips A (12), B (13), C (14), D (15) and E (16) is equal to the minimum height of the countersunk rivet (3).

3. The riveting fixture for a space curved composite material outer cover assembly according to claim 1, characterized in that: The number of mounting holes provided on the pressure strip A (5), pressure strip B (6), pressure strip C (7), pressure strip D (8) and pressure strip E (9) corresponds to the number of countersunk rivets (3).

4. The riveting method using a riveting fixture for a space curved composite material outer cover assembly according to any one of claims 1 to 3, characterized in that: The steps include: Step 1: prepare some single-sided tape, assemble the composite material outer cover (1) to be riveted with the titanium alloy inner shell (2), install the countersunk rivet (3) at the correct rivet hole position, and seal the countersunk surface on the composite material outer cover with tape to prevent the rivet from falling off; Step 2: Place the outer cover assembly with the countersunk rivet (3) on the profile of the support and support seat (4) of the riveting fixture, the profile of the support and support seat (4) is consistent with the outer profile of the composite material outer cover (1), and adjust the placement position according to the position of the fixture marking line; Step 3: Place the gasket strip A (12), gasket strip B (13), gasket strip C (14), gasket strip D (15) and gasket strip E (16) in sequence according to the distribution position of the countersunk rivets (3) on the titanium alloy inner shell (2), and ensure that the holes on the gasket strip A (12), gasket strip B (13), gasket strip C (14), gasket strip D (15) and gasket strip E (16) are concentric with the rivets; Step 4: Install the pressure strips A (5), B (6), C (7), D (8), and E (9) on the guide pillars (10) on the support seat (4) in sequence and fasten them with hexagon socket head screws (11); Step 5: Use an electric wrench and an electric wrench bit (20) to twist the hole adjustment nuts (18) on the pressure strips A (5), B (6), C (7), D (8) and E (9) of the riveting fixture, and quickly load the pressure on the hole adjustment nuts (18) so that the guide sleeve seat (17) is pressed against the surface of the titanium alloy inner shell (2) through the pads A (12), B (13), C (14), D (15) and E (16), and adjust the composite material outer cover (1) and the titanium alloy inner shell (2) to fit, and the composite material outer cover (1) profile and the riveting fixture support butt seat (4) profile fit; complete the work content of the assembly fixture before riveting the parts; Step 6: Select a suitable pneumatic riveting hammer tool, conduct riveting tests on test pieces with equal structures, and determine the riveting process parameters; A hand-held pneumatic riveting hammer is selected, and a riveting hammer punch (19) is inserted into the hole-carrying adjustment nut (18) and the guide sleeve seat (17) on the riveting clamp bead A (5), bead B (6), bead C (7), bead D (8), bead E (9) to perform hammer riveting; Step 7: Repeat the work in step 6 to complete the riveting of the outer cover assembly.

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