A swaging head mechanism and swaging method for aircraft curved skin

Abstract

The application discloses a kind of for aircraft curvature skin riveting head mechanism and riveting method, and riveting mechanism includes three claw sleeve, riveting head, riveting head base, cylinder, cylinder support arm, riveting head support rod, riveting head base is the structure of stepped round table, two cylinder support arms are fixed on the bottom large round table top surface of riveting head base, other end supports cylinder, riveting head support rod is fixed in the center of riveting head base, pass through the hollow piston rod of cylinder, riveting head is fixed in the top of riveting head support rod, three claw sleeve is fixedly installed in the top of hollow piston rod, and coaxial with riveting head, hollow piston rod drives three claw sleeve to move up and down.The application realizes the function of double-curved surface skin normal alignment using simple three claw structure, ensures that product attitude meets normal alignment requirements;The structure of riveting head mechanism is simple, easy to manufacture, and the application range is wide, which can be applied to other components with double-curved skin riveting.

Description

TECHNICAL FIELD

[0001] The present application relates to the riveting technology in the field of aircraft manufacturing, in particular to a riveting head mechanism and a riveting method for aircraft curvature skin. BACKGROUND

[0002] The riveting technology is a common riveting technology in the field of aircraft assembly, and is currently mainly applied to products such as beams and ribs with open space and flat shape. However, most of the aircraft skins have curvature, and some even have large double curvature. In order to meet the flushness requirement of the rivet head, the normal direction of the rivet hole needs to be aligned during riveting to ensure that the angle between the normal direction of the rivet hole and the axis of the riveting head is within the tolerance requirement. However, the ordinary riveting head does not have the function of normal alignment, and cannot ensure that the product is in the normal alignment posture during riveting, which is easy to cause the quality problem of the rivet head flushness out of tolerance. SUMMARY

[0003] The present application aims to solve the problems of the prior art, and provides a riveting head mechanism and a using method suitable for products with single / double curvature skin structure, which can align the skin normal direction during riveting, meet the flushness requirement of the rivet head after riveting, and expand the application range of the riveting technology.

[0004] A riveting head mechanism for aircraft curvature skin, comprising a three-jaw sleeve, a riveting head, a riveting head base, a gas cylinder, a gas cylinder support arm, a riveting head, and a support rod. The riveting head base is a stepped circular table structure, two gas cylinder support arms are symmetrically fixed on the upper surface of the large circular table of the riveting head base, and the other end supports the gas cylinder. The riveting head support rod is fixed in the center of the riveting head base, passes through the hollow piston rod of the gas cylinder, and the riveting head is fixed on the top of the riveting head support rod. The three-jaw sleeve is fixedly installed on the top of the hollow piston rod and coaxial with the riveting head, and the hollow piston rod drives the three-jaw sleeve to move up and down.

[0005] Further, the three-jaw sleeve is a stepped structure, the upper part is a hollow rotary body structure of three jaws, and the upper end faces of the three jaws are on the same plane.

[0006] Further, the relationship between the inner diameter D of the three-jaw sleeve and the curvature of the skin and the diameter d of the rivet head is D=2xd+2n, wherein when the skin is a fuselage skin, n=1, and when the skin is a wing skin, n=2.

[0007] A riveting method using the above-mentioned riveting head mechanism for aircraft curvature skin, comprising the following steps:

[0008] 1. Send the cabin door into the working position between the upper riveting head and the riveting head mechanism;

[0009] 2. Adjust the position of the cabin door to make the center of the riveting head of the riveting head mechanism align with the center of the rivet head, and let the skin descend to contact the three-jaw sleeve;

[0010] 3. Observe the gap between the skin and the three claws, and adjust the hatch posture so that the three claws are completely in contact with the skin;

[0011] 4. After adjustment, turn on the riveting machine to allow air to enter the cylinder chamber. The hollow piston rod drives the three-jaw sleeve to descend to avoid the product. At the same time, the upper riveting head descends and works together with the riveting head in the riveting head mechanism to apply pressure to the rivet, thus completing the riveting work.

[0012] 5. After the riveting is completed, the air chamber of the cylinder is depressurized, and the hollow piston rod drives the three-jaw sleeve to reset.

[0013] The advantages of this invention are: 1) It uses a simple three-jaw structure to realize the function of normal alignment of hyperboloid skin, ensuring that the product posture meets the normal alignment requirements; 2) The riveting head mechanism has a simple structure, is easy to manufacture, and has a wide range of applications, and can be applied to the riveting of other components with hyperboloid skin.

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and examples. Attached Figure Description

[0015] Figure 1 A schematic diagram of the three-dimensional structure of the riveting head mechanism.

[0016] Figure 2 A schematic diagram showing the connection between the three-jaw sleeve, the rivet head support rod, and the hollow piston rod.

[0017] Figure 3 Schematic diagram of the alignment principle of the three-jaw sleeve

[0018] Figure 4 A schematic diagram of the working state of the riveting head mechanism.

[0019] Numbering in the diagram: 1. Hatch door; 2. Skin; 3. Upper rivet head; 4. Riveting head pressing mechanism; 5. Three-jaw sleeve; 6. Rivet head; 7. Cylinder; 8. Cylinder support arm; 9. Rivet head support rod; 10. Rivet head base; 11. Hollow piston rod; 13. Rivet head Detailed Implementation

[0020] like Figure 1 and Figure 2 As shown, a riveting head mechanism for aircraft curved skin includes a three-jaw sleeve 5, a riveting head 6, a cylinder 7, a cylinder support arm 8, a riveting head support rod 9, and a riveting head base 10. The riveting head base 10 has a stepped frustum structure. Two cylinder support arms 8 are symmetrically fixed on the upper surface of the large frustum at the bottom of the riveting head base 10, and the other end supports the cylinder. The riveting head support rod 9 is fixed at the center of the riveting head base 10 and passes through the hollow piston rod 11 of the cylinder 7. The riveting head 6 is fixed on the top of the riveting head support rod 9. The three-jaw sleeve 5 is fixedly installed on the top of the hollow piston rod 11 and is coaxial with the riveting head 6. The hollow piston rod 11 drives the three-jaw sleeve to move up and down.

[0021] As Figure 3 shown, the three-jaw sleeve 5 is the main function of the normal alignment in the present application, the three-jaw sleeve 5 is a stepped structure, the upper part is a hollow rotary body structure of three-jaw, the upper end surface of the three-jaw is on the same plane. If the inner diameter of the three-jaw sleeve 5 is small, the local skin in the contact range of the three-jaw can be regarded as a plane. When the three-jaw is completely attached to the skin 2, according to the principle of three-point positioning a plane. Because the three-jaw sleeve 5 is coaxial with the rivet head 6, the normal line of the local skin plane in the three-jaw range is parallel to the axis of the rivet head 6, and the product attitude meets the normal alignment requirements of the rivet hole.

[0022] As Figure 3 shown, the relationship between the inner diameter D of the three-jaw sleeve 5 and the curvature of the skin 2 and the diameter d of the rivet head 13 is: D = 2 × d + 2 × n, where when the skin is the fuselage skin, n = 1, and when the skin is the wing skin, n = 2.

[0023] According to the above relationship, different inner diameter three-jaw sleeves are made, and the practice verification is as follows:

[0024] 1 When the rivet head diameter is 7.35 mm and the skin is the fuselage skin, the inner diameter D of the three-jaw sleeve is 2 × 7.35 + 2 × 1 = 16.7 mm, and after using the three-jaw sleeve with this inner diameter for riveting, the rivet head 13 can reach a flush degree of 0.05 mm-0.15 mm, meeting the quality requirements.

[0025] 2 When the rivet head diameter is 7.35 mm and the skin is the wing skin, the inner diameter D of the three-jaw sleeve is 2 × 7.35 + 2 × 2 = 18.7 mm, and after using the three-jaw sleeve with this inner diameter for riveting, the rivet head 13 can reach a flush degree of 0.03 mm-0.10 mm, meeting the quality requirements.

[0026] As Figure 2 , Figure 3 and Figure 4 shown, the method for riveting using the above-described riveting head mechanism includes the following steps:

[0027] 1. Send the hatch door into the working position between the upper riveting head 3 and the riveting head mechanism 4;

[0028] 2. Adjust the position of the hatch door 1 so that the riveting head 6 is aligned with the center of the rivet rod, ensuring that the center of the rivet coincides with the center of the three-jaw sleeve 5, and then allow the skin 2 to contact the three-jaw;

[0029] 3. Observe the gap between the skin 2 and the three-jaw, adjust the attitude of the hatch door 1 to eliminate the gap between the three-jaw and the skin 2, so that they are completely attached;

[0030] 4. After adjustment, operate the equipment to make the air cylinder 7 intake, the hollow piston rod 11 drives the three-jaw sleeve 5 to descend to avoid the hatch door 1, at the same time, start the riveting machine, the upper riveting head 3 descends and cooperates with the riveting head 6 in the riveting head mechanism 4 to apply pressure on the rivet, finally completing the riveting work.

[0031] 5After the riveting is completed, the cylinder 7 is depressurized and the hollow piston rod 11 brings the three-jaw sleeve 5 back to its original position.

Claims

1. A mechanism for rivet head of aircraft curvature skin, comprising three-jaw sleeve, rivet head, rivet head base, air cylinder, air cylinder support arm, rivet head support rod, characterized in that The rivet head base is a stepped circular table structure, two cylinder supporting arms are symmetrically fixed on the bottom large circular table upper surface of the rivet head base, the other end supports the cylinder, the rivet supporting rod is fixed in the center of the rivet head base, passes through the hollow piston rod of the cylinder, the rivet is fixed on the top of the rivet supporting rod, the three-jaw sleeve is fixedly installed on the top of the hollow piston rod and coaxial with the rivet, the hollow piston rod drives the three-jaw sleeve to move up and down, the three-jaw sleeve is a stepped structure, the upper part is a hollow rotary body structure of three jaws, the upper end faces of the three jaws are on the same plane, the relationship between the inner diameter D of the three-jaw sleeve and the skin curvature and the rivet head diameter d is: D = 2 × d + 2 × n, wherein when the skin is the fuselage skin, n = 1, when the skin is the wing skin, n = 2, wherein the units of D, d and n are all mm.

2. A method of using the head mechanism of claim 1 for the press riveting of aircraft curved skins, characterized in that The method comprises the following steps: 2-1 send the hatch into the working position between the upper rivet head and the rivet setting mechanism; 2-2 adjust the position of the hatch, so that the center of the rivet head of the rivet setting mechanism is aligned with the center of the rivet head, and the skin is lowered to contact the three jaws; 2-3 observe the gap between the skin and the three jaws, adjust the attitude of the hatch, so that the three jaws are completely attached to the skin respectively; 2-4 after adjustment, start the rivet setting machine to make the air chamber of the cylinder intake, the hollow piston rod drives the three-jaw sleeve to descend to avoid the product, at the same time, the upper rivet head descends, and the rivet head in the rivet setting mechanism applies pressure to the rivet together, finally completes the rivet setting work; 2-5 after the rivet setting is completed, the air chamber of the cylinder is depressurized, and the hollow piston rod drives the three-jaw sleeve to reset.

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