CN114850386B - Riveting device for assembling airplane pull rod and method thereof - Google Patents

Abstract

The application discloses a riveting device for assembling an airplane pull rod and a method thereof, the device comprises a supporting mechanism and a rivet expansion forming mechanism, the supporting mechanism is sleeved on a joint, the supporting mechanism is attached to one end, with a convex arc surface A, of a hollow rivet, the rivet expansion forming mechanism is sleeved on one side, away from the supporting mechanism, of the joint, the rivet expansion forming mechanism comprises a punch movably sleeved on the joint, a first-stage rivet clamp, a second-stage rivet clamp, a cushion block, a ball bearing and a nut, wherein the punch is used for expanding and riveting a port of the hollow rivet, the first-stage rivet clamp is used for extruding and deforming the port of the hollow rivet after being expanded and riveted into a convex arc surface B, the second-stage rivet clamp is used for extruding and deforming the edge of the convex arc surface B to be attached to the outer wall of a connecting pipe, the cushion block is used for transmitting axial pressure to the first-stage rivet clamp or the second-stage rivet clamp, the outer ring of the ball bearing is higher than the inner ring thereof, and the outer ring of the ball bearing is clamped between the cushion block and the nut.

Description

Riveting device for assembling airplane pull rod and method thereof

Technical Field

The application relates to the technical field of aviation part assembly, in particular to a riveting device and method for assembling an airplane pull rod.

Background

The pull rod is a common mechanism for transmitting mechanical load on the airplane, and is mainly used for transmitting a pilot control lever instruction action load and controlling the flying attitude of the airplane. In order to reduce weight and facilitate operation, the pull rod mechanism generally comprises a connecting pipe, a connector, a rivet and the like, wherein the rivet is a tubular hollow rivet, the structural form of the rivet is that the connector which is sleeved with the tubular hollow rivet integrally penetrates through the connecting pipe, two ends of the connector both extend out of the tubular hollow rivet, and the tubular hollow rivet is used for riveting and fastening.

Wherein tubulose hollow rivet one end is the convex circular arc face, other end straight tube structure, then need expand the straight tube end and rivet and form the convex circular arc face and form the turn-over with the circular arc outer wall of laminating connecting pipe, and when expanding the riveting assembly through tubulose hollow rivet at present, the straight tube end that strikes tubulose hollow rivet repeatedly through operating personnel is manual uses the shaping to take turn-ups convex circular arc face for taking, and there is the problem that the difficult control dynamics leads to assembly quality to be poor again through the mode that pure artifical strikes, and assembly efficiency is low, intensity of labour is also big.

Disclosure of Invention

The application mainly aims to provide a riveting device and method for assembling an airplane pull rod, and aims to solve the technical problem that the existing method for riveting and assembling the pull rod in a knocking mode is poor in assembling quality.

In order to achieve the above object, the present application provides a riveting device for assembling an aircraft pull rod, which is used for a pull rod, the pull rod includes a connecting pipe, a joint penetrates through the connecting pipe, a hollow rivet penetrating through the connecting pipe is sleeved on the joint, two ends of the joint penetrate out of two ends of the hollow rivet respectively, one end of the hollow rivet is a convex arc surface a, the riveting device includes a supporting mechanism and a rivet expansion forming mechanism, the supporting mechanism is sleeved on the joint, the supporting mechanism is attached to one end of the hollow rivet with the convex arc surface a, the rivet expansion forming mechanism is sleeved on one side of the joint far away from the supporting mechanism, the rivet expansion forming mechanism includes a punch movably sleeved on the joint, a first-stage rivet clip, a second-stage rivet clip, a cushion block, a ball bearing and a nut sleeved on the joint, the punch is used for expanding and riveting a port of the hollow rivet, the first-stage rivet clip is used for extruding and deforming the port of the hollow rivet into a convex arc surface B, the second-stage rivet clip is used for extruding and deforming the edge of the convex arc surface B to be attached to the outer wall of the connecting pipe, the cushion block is used for transmitting axial pressure to the first-stage rivet clip or the second-stage rivet clip, the outer ring of the first-stage rivet clip, the outer ring of the ball bearing, and the outer ring of the ball bearing is clamped between the nut.

Optionally, one end of the punch close to the hollow rivet is a conical surface, and the conical degree of the conical surface is 30-60 degrees.

Optionally, one surface of the primary riveting clamp close to the hollow rivet is provided with an inner concave arc surface, and the inner concave arc surface is used for extruding and deforming the port of the expanded and riveted hollow rivet into a convex arc surface B.

Optionally, the second grade is riveted the card and is included deformation piece, and deformation piece keeps away from hollow rivet's one side and is provided with two at least inclined plane bosss, and the cushion can transmit axial pressure to inclined plane boss, and deformation piece is close to hollow rivet's one side and is provided with the indent arc surface, sets up jaggedly on the indent arc surface.

Optionally, one side of the cushion block close to the second-stage riveting clamp is provided with an extrusion inclined plane, and the extrusion inclined plane is used for being in contact with an inclined plane boss.

Optionally, the slope of the compression ramp is greater than the slope of the ramp boss.

Alternatively, the draft angle of the compression ramp is 45 ° and the draft angle of the ramp boss is 30 °.

Optionally, the supporting mechanism includes a supporting seat and a threaded rod, the supporting seat is movably sleeved on the joint and contacts with the convex arc surface a, and the threaded rod is connected to the joint in a threaded manner and abuts against the supporting seat.

Optionally, one surface of the supporting seat close to the hollow rivet is provided with an inner concave arc surface matched with the convex arc surface A.

A riveting method adopts the riveting device for assembling the airplane pull rod, and comprises the following steps:

sleeving the supporting mechanism on the joint to enable the supporting mechanism to be tightly abutted against one end of the hollow rivet with the convex arc surface A;

sleeving a punch, a cushion block, a ball bearing and a nut on one side of the joint far away from the supporting mechanism in sequence, and screwing the nut;

applying a tightening torque to the nut through a wrench to enable the outer ring of the ball bearing to rotate so as to enable the cushion block to generate axial pressure and transmit the axial pressure to the punch until the punch performs expanding riveting on the port of the hollow rivet to form a flaring;

sequentially taking down the nut, the ball bearing, the cushion block and the punch, sequentially sleeving the first-stage riveting clamp, the cushion block, the ball bearing and the nut, and screwing the nut;

applying a tightening torque to the nut through a wrench to transmit axial pressure to the primary riveting clamp until the primary riveting clamp extrudes and deforms the flaring of the hollow rivet into a convex arc surface B;

sequentially taking down the nut, the ball bearing, the cushion block and the primary riveting clamp, sequentially sleeving the secondary riveting clamp, the cushion block, the ball bearing and the nut, and screwing the nut;

and applying a tightening torque to the nut through a wrench so as to transmit axial pressure to the second-stage riveting clamp until the second-stage riveting clamp extrudes and deforms the edge of the convex arc surface B into a flanging, and the flanging is attached to the outer wall of the connecting pipe.

Optionally, apply tightening torque to the nut through the spanner to rivet the card for the second grade with axial pressure transmission, rivet the card until the second grade and become the turn-ups with protruding circular arc face B's edge extrusion deformation, and make the turn-ups laminate in the connecting tube outer wall after the step, still include following step:

taking down all the support mechanisms on the two sides of the joint, the secondary riveting clamp, the cushion block, the ball bearing and the nut;

a supporting mechanism is arranged on one side of the joint close to the convex arc surface B to tightly press the convex arc surface B;

and sequentially sleeving the second-stage riveting clamp, the cushion block, the ball bearing and the nut on one side of the joint close to the convex arc surface A, and screwing the nut so that the concave arc surface of the second-stage riveting clamp is attached to the convex arc surface A, thereby finishing the assembly.

Optionally, the tightening torque is formulated as an engineering empirical formula:

M＝k·F·D·10-3；

in the formula, k is a coefficient and is 0.1-0.3; f is axial pressure; d is the major diameter of the thread.

The beneficial effect that this application can realize as follows:

the end of the hollow rivet with the convex arc surface A can be fixed through the supporting mechanism, then the other end of the hollow rivet which is not formed is subjected to expanding riveting forming through the expanding riveting forming mechanism, during operation, the punch, the cushion block, the ball bearing and the nut are sequentially sleeved on the joint, because the outer ring of the ball bearing is higher than the inner ring of the ball bearing, when the nut is applied with tightening torque, the outer ring of the ball bearing rotates, the inner ring of the ball bearing keeps static, only axial pressure is transmitted to the cushion block and the punch, the cushion block and the punch cannot rotate along with the cushion block, axial pressure without radial relative motion is transmitted backwards, thereby reducing rotational friction, reducing the abrasion of the hollow rivet, improving the surface quality, and the axial pressure and the tightening torque have a large proportional relation, and only one person can obtain larger axial pressure by applying small tightening torque, thereby can make the drift produce axial pressure to the port of hollow rivet and expand and rivet in order to form the flaring, the operation is more laborsaving, then replace the drift for the one-level rivet card, utilize same principle, slowly apply the tightening torque to the nut, transmit axial pressure for the one-level rivet card, extrude the flaring of hollow rivet and warp into protruding circular arc face B, replace the one-level rivet card for the second grade rivet card again, slowly apply the tightening torque to the nut, squeeze the deformation with the edge of protruding circular arc face B and form the turn-ups and laminate in the connecting tube outer wall, thereby accomplish the formation of riveting of expanding to the hollow rivet tip, relative current through the shaping mode of strikeing repeatedly, this application can through one-man operation, human resources are saved, reduce operating personnel's intensity of labour, efficiency is improved, and deformation easily controls, the risk of damage surface has been reduced, assembly quality has been improved greatly.

Drawings

In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings that are needed in the detailed description of the present application or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is an exploded view of a riveting apparatus for assembling an aircraft tension rod according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a secondary rivet card in an embodiment of the present application;

FIG. 3 is a schematic structural view of a blind rivet during expansion in an embodiment of the present application;

FIG. 4 is a schematic structural view of a hollow rivet after expansion in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of an embodiment of the present application when a port of a hollow rivet after expansion riveting is deformed into a convex circular arc surface B by pressing;

FIG. 6 is a schematic structural view illustrating a case where one end of the pop rivet forms a convex arc surface B in the embodiment of the present application;

FIG. 7 is a schematic structural diagram of the embodiment of the present application when the edge of the convex arc surface B of the pop rivet is pressed and deformed to form a flange;

FIG. 8 is a schematic structural view of the edge of the convex arc B of the pop rivet forming the burring in the embodiment of the present application.

Reference numerals are as follows:

100-pull rod, 110-connecting pipe, 120-joint, 130-hollow rivet, 131-convex arc surface A, 132-flaring, 133-convex arc surface B, 134-flanging, 200-supporting mechanism, 210-supporting seat, 220-threaded rod, 300-expanding rivet forming mechanism, 310-punch, 320-first-stage rivet clamp, 330-second-stage rivet clamp, 331-deformation sheet, 332-inclined plane boss, 333-notch, 340-cushion block, 341-extrusion inclined plane, 350-ball bearing and 360-nut.

The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that all directional indications (such as up, down, left, right, front, back, 8230; \8230;) in the embodiments of the present application are only used to explain the relative positional relationship between the components in a particular posture, the motion situation, etc., and if the particular posture is changed, the directional indication is correspondingly changed.

In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B", including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

Example 1

Referring to fig. 1 to 8, the embodiment provides a riveting device for assembling an aircraft tie rod, which is used for a tie rod 100, the tie rod 100 includes a connecting pipe 110, a joint 120 penetrates through the connecting pipe 110, a hollow rivet 130 penetrating through the connecting pipe 110 is sleeved on the joint 120, two ends of the joint 120 respectively penetrate through two ends of the hollow rivet 130, and one end of the hollow rivet 130 is a convex arc surface a131;

the riveting device comprises a supporting mechanism 200 and an expanding riveting forming mechanism 300, the supporting mechanism 200 is sleeved on the joint 120, the supporting mechanism 200 is attached to one end, with a convex arc surface A131, of the hollow rivet 130, the expanding riveting forming mechanism 300 is sleeved on one side, away from the supporting mechanism 200, of the joint 120, the expanding riveting forming mechanism 300 comprises a punch 310 movably sleeved on the joint 120, a first-stage riveting clamp 320, a second-stage riveting clamp 330, a cushion block 340, a ball bearing 350 and a nut 360 sleeved on the joint 120 in a threaded manner, the punch 310 is used for expanding and riveting a port of the hollow rivet 130, the first-stage riveting clamp 320 is used for extruding and deforming the port of the expanded and riveted hollow rivet 130 into a convex arc surface B133, the second-stage riveting clamp 330 is used for extruding and deforming the edge of the convex arc surface B133 to be attached to the outer wall of the connecting pipe 110, the cushion block 340 is used for transmitting axial pressure to the first-stage riveting clamp 320 or the second-stage riveting clamp 330, the outer ring of the ball bearing 350 is higher than the inner ring thereof, and the outer ring of the ball bearing 350 is clamped between the cushion block 340 and the nut 360.

The current riveting assembly process comprises the following steps: with the one end of rivet area circular arc on with the supporting seat cushion, the supporting seat clamping is on the vice, the other end with earlier with the hammer strike the drift flaring, the card riveting turn-ups is strikeed to the reuse hammer, the turn-ups needs another people to assist after the certain degree, puts into certain angle with pull rod 100, strikes the card again and makes rivet turn-ups position and the laminating of the 110 arc surface of connecting pipe, this in-process, has following difficulty and the problem of the 100 high-efficient assemblies of restriction pull rod:

(1) Assembly quality problems: an operator manually beats the rivet clamp to enable the rivet to be flanged, so that the force is difficult to effectively control, repeated beating is needed, and in the beating process of enabling the flanged part of the rivet to be attached to the arc surface of the connecting pipe 110, the rivet clamp easily collides with the connecting pipe 110 to damage a paint layer on the surface of the connecting pipe 110 and even the connecting pipe 110, so that the appearance quality is influenced; if the force is too large in the knocking process, the rivet head with the convex arc shape is flattened, and the protruding size requirement of the rivet head cannot be met;

(2) The problem of assembly efficiency: as described above, the current assembly method needs to be completed by two persons in cooperation, which increases the labor cost; after the surface of the connecting pipe 110 is damaged, subsequent filing and reworking and paint repairing are needed, the paint repairing and drying time is generally 24 hours, and the assembly lead cycle of the pull rod 100 is greatly prolonged; flattening the rivet head, drilling out the rivet, and replacing the rivet again for installation;

(3) The labor intensity problem is as follows: generally, 6 rivets are arranged on one pull rod 100, when each rivet is riveted, two ends of each rivet need to be flanged and deformed, one rivet needs to be knocked for 15 times on average, an operator knocks about 10 pull rods 100 to basically release force, the labor intensity is high, and the physical and psychological health of the operator is influenced.

At present, aviation subassembly assembly has proposed higher and higher requirement to riveting quality and efficiency of joining in marriage, and two people of tradition cooperate, and the assembly technology of knocking rivet riveting can not satisfy aircraft pull rod assembly's assembly demand far away.

Therefore, in this embodiment, one end of the hollow rivet 130 having the convex arc surface a131 is fixed by the supporting mechanism 200, and then the other end of the hollow rivet 130 not formed is subjected to expanding riveting forming by the expanding riveting forming mechanism 300, during operation, the punch 310, the cushion block 340, the ball bearing 350 and the nut 360 are sequentially sleeved on the joint 120, since the outer ring of the ball bearing 350 is higher than the inner ring thereof, when the tightening torque is applied to the nut 360, the outer ring of the ball bearing 350 rotates, the inner ring thereof remains stationary, only the axial pressure is transmitted to the cushion block 340 and the punch 310, the cushion block 340 and the punch 310 do not rotate therewith, and the axial pressure without radial relative movement is transmitted backwards, thereby reducing the rotational friction, reducing the wear of one person on the hollow rivet 130, improving the surface quality, and having a large proportional relationship between the axial pressure and the tightening torque, and only a small tightening torque is applied to obtain a large axial pressure, therefore, the punch 310 can generate axial pressure on the port of the hollow rivet 130 to perform expanding riveting to form the flaring 132, the operation is labor-saving, then the punch 310 is replaced by the first-stage riveting clamp 320, the same principle is utilized, the tightening torque is slowly applied to the nut 360, the axial pressure is transmitted to the first-stage riveting clamp 320, the flaring 132 of the hollow rivet 130 is extruded and deformed into the convex circular arc surface B133, then the first-stage riveting clamp 320 is replaced by the second-stage riveting clamp 330, the tightening torque is slowly applied to the nut 360, the edge of the convex circular arc surface B133 is extruded and deformed into the flanging 134 (which is a curved surface at this time) and is attached to the outer wall of the connecting pipe 110, and accordingly expanding riveting forming on the end part of the hollow rivet 130 is completed, compared with the existing forming mode of repeated knocking, the method can be operated by one person, manpower resources are saved, and labor intensity of operators is reduced, the efficiency is improved, the deformation is easy to control, the risk of damaging the surface is reduced, and the assembly quality is greatly improved.

It should be noted that, after the forming flange 134 at one end of the hollow rivet 130 is completed, the second-stage rivet clip 330, the cushion block 340, the ball bearing 350 and the nut 360 in the support mechanism 200 and the expanding rivet forming mechanism 300 need to be assembled interchangeably at two sides of the joint 120 to form the flange 134 for the convex arc surface a131, and the assembly is completed; when both ends of the hollow rivet 130 need to be expanded and riveted, after the forming flanging 134 at one end is completed according to the above operation, the support mechanism 200 and the expanding and riveting forming mechanism 300 are exchanged at both sides of the joint 120, and the operation is repeated to complete the forming flanging 134 at the other end.

In addition, the nut 360 is a hexagon nut 360, the ball bearing 350 is a deep groove ball bearing 350, a wrench can be used for operating when the nut 360 is rotated, and through holes matched with the joints 120 are formed in the middle of the punch 310, the first-stage riveting clamp 320, the second-stage riveting clamp 330 and the cushion block 340.

As an alternative embodiment, the end of the punch 310 adjacent to the blind rivet 130 is tapered, the taper of the tapered surface being 30 ° to 60 °, and a static axial force directed outward toward the end of the blind rivet 130 can be generated by the tapered surface of the punch 310, so that the flared end 132 is smoothly formed at the end of the blind rivet 130, and the flared end 132 is widened to 60 °.

As an optional implementation manner, one surface of the primary rivet clip 320, which is close to the hollow rivet 130, is provided with an inner concave arc surface, and the inner concave arc surface is used for extruding and deforming the port of the expanded hollow rivet 130 into a convex arc surface B133.

In this embodiment, when the first-stage riveting clamp 320 extrudes and deforms the flared end 132 of the hollow rivet 130, the concave arc surface of the first-stage riveting clamp 320 can generate outward-turning stress on the edge of the flared end 132 of the hollow rivet 130, so that the flared end 132 forms a convex arc surface B133 which can be attached to the concave arc surface of the first-stage riveting clamp 320, the stress is uniform, the deformation is controllable, and the forming quality is ensured.

As an optional implementation manner, the second-stage riveting clamp 330 includes a deformation sheet 331, at least two inclined plane bosses 332 are disposed on a side of the deformation sheet 331 away from the pop rivet 130, the cushion block 340 can transmit axial pressure to the inclined plane bosses 332, an inner concave arc surface is disposed on a side of the deformation sheet 331 close to the pop rivet 130, and a notch 333 is disposed on the inner concave arc surface. The inclined plane bosses 332 are arranged in two symmetrical arrangement, and inclined planes are arranged on the opposite surfaces of the two inclined plane bosses 332.

In this embodiment, when the second-stage riveting clamp 330 is used for extrusion molding of the edge of the convex circular arc B133, after the axial pressure is transmitted to the cushion block 340, the cushion block 340 can generate pressure on the inclined plane boss 332 of the second-stage riveting clamp 330, because the deformation sheet 331 in the middle of the second-stage riveting clamp 330 is thinner, and the other side has the notch 333, which is convenient for deformation, under the action of the cushion block 340, the second-stage riveting clamp 330 generates inward bending deformation, that is, the inclined plane bosses 332 approach each other, and the other side of the second-stage riveting clamp 330 expands outward due to the protrusion formed by the notch 333, so as to smoothly transmit the pressure to the edge of the convex circular arc B133 of the hollow rivet 130, so as to make the edge of the convex circular arc B133 deform and adhere to the cylindrical surface of the connecting pipe 110 until the inward concave circular arc surface of the second-stage riveting clamp 330 adheres to the convex circular arc B133, at this time, the flange 134 with a curved surface structure is formed, which is ingenious in structural design, so as to ensure the molding quality of the flange 134, and reduce the wear to the lowest of the hollow rivet 130.

As an alternative embodiment, a pressing inclined plane 341 is provided on a side of the cushion block 340 close to the secondary rivet pin 330, the pressing inclined plane 341 is configured to contact the inclined plane boss 332, and a radial force component of the inclined plane can be transmitted through the pressing inclined plane 341 to ensure a force acting on the inclined plane boss 332.

As an optional embodiment, the slope of the pressing slope 341 is greater than the slope of the slope bosses 332, so that when the pressing slope 341 transmits pressure to the slopes of the slope bosses 332, the slopes of the two slope bosses 332 gradually adhere to the pressing slope 341 and approach each other, so that the secondary rivet clip 330 is smoothly deformed.

It should be noted that the secondary rivet 330 should be made of elastic plastic material, and have a memory function, and can be restored to its original shape after being deformed, so as to be convenient for repeated use.

As an alternative embodiment, the slope of the extrusion slope 341 is 45 °, the slope of the slope boss 332 is 30 °, and the stress is stable, so that the assembly requirement is met.

As an alternative embodiment, the supporting mechanism 200 includes a supporting base 210 and a threaded rod 220 (with an internal thread), the supporting base 210 is movably sleeved on the joint 120 and contacts with the convex arc surface a131 (a through hole matched with the joint 120 is formed in the middle of the supporting base 210), and the threaded rod 220 is in threaded connection with the joint 120 and abuts against the supporting base 210.

In this embodiment, when the supporting mechanism 200 is installed, the supporting base 210 is firstly sleeved on the joint 120, and then the threaded rod 220 is screwed to press the supporting base 210 against the convex arc surface a131 of the hollow rivet 130, where the threaded rod 220 can also be replaced by a nut. It should be noted that the threaded rod 220 and the hollow rivet 130 are in close clearance fit and can be easily inserted, and the end of the threaded rod is designed with a cross-shaped groove to facilitate installation.

As an alternative embodiment, one surface of the supporting seat 210 close to the pop rivet 130 is provided with an inner concave arc surface matching with the convex arc surface a131, so as to increase the contact area, thereby increasing the fixing firmness, it should be noted that the inner concave arc surface of the supporting seat 210 is not a complete semicircle, and interference caused by manufacturing tolerance is prevented.

Example 2

Referring to fig. 1 to 8, the present embodiment provides a riveting method using the riveting device for assembling an aircraft tie rod described in embodiment 1, including the following steps:

sleeving the supporting mechanism 200 on the joint 120, so that the supporting mechanism 200 is tightly abutted against one end of the hollow rivet 130 with the convex arc surface A131;

a punch 310, a cushion block 340, a ball bearing 350 and a nut 360 are sequentially sleeved on one side, far away from the supporting mechanism 200, of the joint 120, and the nut 360 is screwed;

applying a tightening torque to the nut 360 through a wrench to rotate the outer ring of the ball bearing 350, so that the cushion block 340 generates axial pressure and transmits the axial pressure to the punch 310 until the punch 310 performs rivet expanding on the port of the hollow rivet 130 to form the flaring 132;

sequentially taking down the nut 360, the ball bearing 350, the cushion block 340 and the punch 310, sequentially sleeving the first-stage riveting clamp 320, the cushion block 340, the ball bearing 350 and the nut 360, and screwing the nut 360;

a tightening torque is applied to the nut 360 through a wrench to transmit axial pressure to the first-stage riveting clamp 320 until the first-stage riveting clamp 320 extrudes and deforms the flaring 132 of the hollow rivet 130 into a convex circular arc surface B133;

sequentially taking down the nut 360, the ball bearing 350, the cushion block 340 and the primary riveting clamp 320, sequentially sleeving the secondary riveting clamp 330, the cushion block 340, the ball bearing 350 and the nut 360, and screwing the nut 360;

and a tightening torque is applied to the nut 360 through a wrench, so that the axial pressure is transmitted to the second-stage riveting clamp 330 until the second-stage riveting clamp 330 presses and deforms the edge of the convex arc surface B133 to form a flange 134, and the flange 134 is attached to the outer wall of the connecting pipe 110.

In this embodiment, one end of the hollow rivet 130 having the convex arc surface a131 is fixed by the supporting mechanism 200 to prevent the other end from being loosened during assembly, and then the other end of the hollow rivet 130 not formed is subjected to expanding riveting forming by the expanding riveting forming mechanism 300, during operation, the punch 310, the cushion block 340, the ball bearing 350 and the nut 360 are sequentially sleeved on the joint 120, the nut 360 is slowly screwed to generate a screwing torque, the screwing torque is converted into an axial pressure by the ball bearing 350, only the axial pressure is transmitted to the cushion block 340 and the punch 310, the cushion block 340 and the punch 310 cannot rotate therewith, and the axial pressure without radial relative movement is transmitted backwards, so that the rotational friction is reduced, the abrasion to the hollow rivet 130 is reduced, the surface quality is improved, and the axial pressure and the screwing torque have a large proportional relationship, and only one person can obtain a large axial pressure by applying a small screwing torque, therefore, the punch 310 can generate axial pressure on the port of the hollow rivet 130 to perform expanding riveting to form the flaring 132, the operation is labor-saving, then the punch 310 is replaced by the first-stage riveting clamp 320, the same principle is utilized, the screwing torque is slowly applied to the nut 360, the axial pressure is transmitted to the first-stage riveting clamp 320, the flaring 132 of the hollow rivet 130 is extruded and deformed into the convex arc surface B133, the first-stage riveting clamp 320 is replaced by the second-stage riveting clamp 330, the screwing torque is slowly applied to the nut 360, the edge of the convex arc surface B133 is extruded and deformed into the flanging 134 and is attached to the outer wall of the connecting pipe 110, and accordingly expanding riveting forming of the end part of the hollow rivet 130 is completed, compared with the existing forming mode of repeated knocking, the method can be operated by one person, manpower resources are saved, the labor intensity of operators is reduced, the efficiency is improved, the deformation is easy to control, and the risk of damaging the surface is reduced, the assembly quality is greatly improved.

As an alternative embodiment, after the step of applying a tightening torque to the nut 360 by a wrench to transmit an axial pressure to the secondary rivet 330 until the secondary rivet 330 presses and deforms the edge of the convex arc B133 to form the flange 134 and make the flange 134 adhere to the outer wall of the connecting pipe 110, the method further comprises the following steps:

taking down all the supporting mechanisms 200, the secondary riveting clamps 330, the cushion blocks 340, the ball bearings 350 and the nuts 360 on two sides of the joint 120; a supporting mechanism 200 is arranged on one side of the joint 120 close to the convex arc surface B133 to press the convex arc surface B133 tightly;

and sequentially sleeving the second-stage riveting clamp 330, the cushion block 340, the ball bearing 350 and the nut 360 on one side of the joint 120 close to the convex arc surface A131, and screwing the nut 360 so as to enable the concave arc surface of the second-stage riveting clamp 330 to be attached to the convex arc surface A131, thereby completing assembly.

As an alternative embodiment, the empirical formula of the tightening torque is:

M＝k·F·D·10-3；

in the formula, k is a coefficient and is 0.1-0.3; f is axial pressure; d is the major diameter of the thread.

It can be seen from the formula that the axial pressure F and the tightening torque M have a large proportional relationship, the large axial pressure F can be obtained by applying a small tightening torque M, the operation can be simply performed by using a common open-end wrench, the tightening torque M required to be input during the specific operation can be guided according to the empirical formula, and the deformation degree of the end of the hollow rivet 130 can be accurately controlled, so that the assembling quality can be improved.

The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application, or which are directly or indirectly applied to other related technical fields, are included in the scope of the present application.

Claims (12)

1. The utility model provides an aircraft is riveting set for pull rod assembly for the pull rod, the pull rod includes the connecting pipe, it has the joint to run through in the connecting pipe, the cover is equipped with and runs through on the joint the hollow rivet of connecting pipe, it wears out respectively to connect both ends the hollow rivet both ends, hollow rivet's one end is protruding circular arc A, its characterized in that, riveting set includes:

the supporting mechanism is sleeved on the joint and is attached to one end, provided with a convex arc surface A, of the hollow rivet;

expand and rivet forming mechanism, expand and rivet the forming mechanism cover and locate the joint is kept away from one side of supporting mechanism, it includes that mobile cover locates to expand and rivet forming mechanism drift, one-level on the joint and rivet card, second grade and rivet card, cushion, ball bearing and thread bush and locate nut on the joint, the drift is used for right hollow rivet's port expands rivets, the one-level is riveted the card and is used for expanding the port extrusion deformation of the hollow rivet after riveting into protruding circle cambered surface B, the second grade is riveted the card and is used for with protruding circle cambered surface B's edge extrusion deformation extremely laminate in the connecting tube outer wall, the cushion is used for right the one-level is riveted the card or the card transmission axial force is riveted to the second grade, the outer lane of ball bearing is higher than its inner circle, the outer lane of ball bearing be pressed from both sides tightly in the cushion with between the nut.

2. The riveting apparatus for assembling the aircraft draw bar as recited in claim 1, wherein a head of the punch near the pop rivet is a tapered surface having a taper of 30 ° to 60 °.

3. The riveting device for assembling the airplane pull rod as claimed in claim 1, wherein one surface of the primary riveting clamp, which is close to the hollow rivet, is provided with an inner concave arc surface, and the inner concave arc surface is used for extruding and deforming the port of the hollow rivet after expanding and riveting into a convex arc surface B.

4. The riveting device for assembling the airplane pull rod according to claim 1, wherein the second-level riveting clamp comprises a deformation sheet, at least two inclined bosses are arranged on one surface of the deformation sheet, which is far away from the hollow rivet, the cushion block can transmit axial pressure to the inclined bosses, and an inner concave arc surface is arranged on one surface of the deformation sheet, which is close to the hollow rivet, and a notch is formed in the inner concave arc surface.

5. The riveting device for assembling the airplane pull rod as recited in claim 4, wherein a pressing inclined surface is provided on one surface of the cushion block close to the secondary rivet fastener, and the pressing inclined surface is used for contacting with the inclined surface boss.

6. The riveting apparatus for assembling the aircraft tie rod according to claim 5, wherein the inclination of the extrusion slope is greater than that of the slope boss.

7. A riveting apparatus for assembling an aircraft tie rod according to claim 6, wherein the inclination of the extrusion bevel is 45 ° and the inclination of the bevel boss is 30 °.

8. The riveting apparatus for assembling the aircraft tension rod according to claim 1, wherein the supporting mechanism comprises a supporting seat and a threaded rod, the supporting seat is movably sleeved on the joint and contacts with the convex arc surface A, and the threaded rod is screwed on the joint and abuts against the supporting seat.

9. The riveting apparatus for assembling the aircraft tension rod according to claim 8, wherein one surface of the support seat near the hollow rivet is provided with a concave arc surface matching with the convex arc surface A.

10. A riveting method, characterized in that a riveting apparatus for aircraft tie rod assembly according to any one of claims 1 to 9 is used, comprising the steps of:

sleeving the supporting mechanism on the joint, and enabling the supporting mechanism to be tightly propped against one end, provided with a convex arc surface A, of the hollow rivet;

the punch, the cushion block, the ball bearing and the nut are sequentially sleeved on one side, far away from the supporting mechanism, of the joint, and the nut is screwed down;

applying a tightening torque to the nut through a wrench, and enabling an outer ring of the ball bearing to rotate so as to enable the cushion block to generate axial pressure and transmit the axial pressure to the punch until the punch performs expanding riveting on a port of the hollow rivet to form a flaring;

sequentially taking down the nut, the ball bearing, the cushion block and the punch, sequentially sleeving the primary riveting clamp, the cushion block, the ball bearing and the nut, and screwing the nut;

applying a tightening torque to the nut through a wrench to transmit axial pressure to the first-stage riveting clamp until the first-stage riveting clamp extrudes and deforms the flaring of the hollow rivet into a convex circular arc surface B;

sequentially taking down the nut, the ball bearing, the cushion block and the primary riveting clamp, sequentially sleeving the secondary riveting clamp, the cushion block, the ball bearing and the nut, and screwing the nut;

and applying a tightening torque to the nut through a wrench so as to transmit axial pressure to the second-stage riveting clamp until the second-stage riveting clamp extrudes and deforms the edge of the convex arc surface B into a flanging, and enabling the flanging to be attached to the outer wall of the connecting pipe.

11. The riveting method according to claim 10, wherein the step of applying a tightening torque to the nut by a wrench to transmit an axial pressure to the secondary rivet fastener until the secondary rivet fastener extrudes and deforms the edge of the convex arc B into a flanged edge, and the flanged edge is attached to the outer wall of the connecting pipe further comprises the following steps:

taking down all the supporting mechanisms on the two sides of the joint, the secondary riveting clamp, the cushion block, the ball bearing and the nut;

the supporting mechanism is arranged on one side, close to the convex arc surface B, of the joint so as to press the convex arc surface B tightly;

and sleeving the second-stage riveting clamp, the cushion block, the ball bearing and the nut on one side of the joint close to the convex arc surface A in sequence, and screwing the nut tightly so that the concave arc surface of the second-stage riveting clamp is tightly attached to the convex arc surface A to finish assembly.

12. A riveting method according to claim 10 or 11, wherein the tightening torque is calculated by the empirical formula:

M＝k·F·D·10-3；

in the formula, k is a coefficient and is 0.1-0.3; f is axial pressure; d is the major diameter of the thread.

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