JPH0424175B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fastening rivet driving method, and more particularly to a fastening rivet driving method for large structures such as the main wing skin of an aircraft.

[Technical background of the invention and its problems]

To connect the members to be connected with rivets, the members to be connected are stacked and supported in the horizontal direction, and a through hole is formed through the members to be connected from the top to the bottom using a drill.
Insert a rivet from top to bottom into the through hole and crush both ends with a punch to connect the parts to be connected, or insert a headed lock pin into the formed through hole and tighten the male thread at the tip of the lock pin. The common method is to make the part protrude below the part to be connected, and then screw a lock collar into the male threaded part to tighten it.

In the latter method, after inserting the headed lock pin into the through hole, it is necessary to screw the lock collar onto the tip of the lock pin while holding the head with an anvil and preventing rotation of the lock pin. However, at this time, since the pressing member that presses and presses the members to be connected from both sides in advance is in contact with both sides of the members to be connected in the axial direction of the riveting part, it is difficult to supply the lock pin and the lock collar. The rotational drive for screwing in the locking collar must also all take place through the interior of the pressing member. For this purpose, the pressing member has a hollow structure, but in the conventional method, it has not been possible to efficiently supply the lock collar, prevent the lock pin from rotating, or screw in the lock collar through the inside of the hollow pressing member.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to supply and screw in a lock collar to the threaded portion of a lock pin inserted into a through hole of a member to be connected, and to provide a mechanism for screwing the lock collar around the lock pin. It is an object of the present invention to provide a tightening fastening method that can efficiently and reliably perform fastening.

[Summary of the invention]

According to the tightening fastener driving method according to the present invention, the members to be connected to be connected by driving rivets are stacked and supported, and the first cylindrical pressing member on one side of the connected members in the direction of the driving axis is advanced. a second cylindrical press that presses its end face against the surface of the connected member, and is located on the other side of the connected member and houses a hollow lock collar drive shaft rotatably and slidably in the axial direction; By advancing the member and pressing its end face against the surface of the member to be connected, the member to be connected is held under pressure from both sides by both pressing members, and a drilling drill is passed through the inside of the first cylindrical pressing member. is advanced to form a through hole with a countersunk portion on one side in the connected member, a sealant is applied to the inner wall surface of the through hole and its vicinity, and one end has a shape corresponding to the countersunk portion. A threaded lock pin having a head and a non-circular engagement portion on the other end surface is inserted into the through hole through the inside of the first cylindrical pressing member, and the threaded portion of the lock pin is projected to the other side of the through hole. , the anvil is advanced through the inside of the first cylindrical pressing member and brought into contact with the head of the lock pin in the through hole, and a lock collar having a female thread that is screwed into the screw of the lock pin is rotated relative to the inside of the lock collar drive shaft. At the same time, insert the mandrel for fixing the lock pin through the inside of the lock collar inside the lock collar drive shaft, and insert the mandrel into the lock pin, and insert the mandrel through the inside of the lock collar inside the lock collar drive shaft. The rotation of the lock pin is prevented by engaging with the circular engagement portion, and by rotating the lock collar drive shaft, the lock collar is rotated in the lock collar screwing direction and screwed into the lock pin. The above object is achieved by separating the cylindrical pressing member and the second cylindrical pressing member from the surface of the connected member and retracting the lock collar drive shaft and the mandrel inside the second cylindrical pressing member. .

[Embodiments of the invention]

In FIG. 1, reference numeral 2 indicates a main wing of an aircraft as an example of a member to be connected to which rivets are driven. The main wing 2 is fixed to the workpiece support frame 3 by a fixing means (not shown). The support frame 3 has a rectangular shape, and both longitudinal ends thereof are supported by a carriage 6 by a support shaft 4. The support frame 3 can be rotated at any angle around the support shaft 4 and fixed. The carriage 6 is supported so as to be displaceable along a guide 7 in the Y-Y direction.

A guide 7 supporting the carriage 6 is supported by a support 8 so as to be movable in the Z-Z direction.
is supported by a truck 11 that can run along rails 10 in the XX direction. The carriage 6, guide 7, truck 11, etc. are displaced by appropriate motors.

A riveter frame 13 having a shape that sandwiches the workpiece support frame 3 from above and below is installed on one side of the rail 10. The upper arm 13a of this riveter frame 13
A first cylindrical pressing member, a lock pin supply device, etc., which will be described later, are provided at the tip of the arm 13.
A second cylindrical pressing member, a lock collar supply device, a lock collar drive shaft, etc., which will be described later, are provided at the tip of b. The above-described device provided on the riveter frame arm 13a and the riveter frame arm 13b
The above-mentioned device installed in the main wing 2 acts on the main wing 2 from above and below, respectively, thereby performing the fastening operation as described below.

The riveting is done at countless positions on the entire surface of the main wing 2, and the action is carried out by the riveter drive hydraulic unit 1.
4. Controlled by NC control device 15 and sequence controller 16. Note that 17 indicates a power supply box.

In FIG. 2, 20 is a first cylindrical pressing member provided on the upper arm 13a of the riveter frame;
21 is a second cylindrical pressing member provided on the lower arm 13b, and both of these pressing members 20 and 21 are movably attached to the riveter frame 13 so as to approach the connected members 2a and 2b. Supported. The second pressing member 21 has a cylindrical shape and has a hollow lock collar drive shaft 22 therein. The drive shaft 22 is connected to a drive source (not shown) and is rotationally driven, and is slidably displaceable in the axial direction within the pressing member 21. Further, a protrusion 23 is formed on the inner surface of the lock collar drive shaft 22 in its longitudinal direction, and an inner surface 24 of the lock collar drive shaft is formed in a non-circular cross section, for example, an oval cross section, following the upper end of the protrusion 23.

From the state shown in FIG. 2, the first and second cylindrical pressing members 20, 21 move relatively forward toward the surfaces of the connected members 2a, 2b, and the end surfaces of both cylindrical members 20, 21 are moved forward as shown in FIG. As shown in FIG.
It is held under pressure by 0 and 21.

Next, while maintaining the state shown in Figure 3, drill the drilling drill 2.
6 is lowered to open the through hole 2 as shown in FIG.
7 is formed. The through hole 27 has a countersunk portion 28 on the upper end side, and for this purpose, the drilling drill 26 is provided with a countersunk portion forming blade 29.

A sealant is applied to the inner surface of the through hole 27 and the vicinity thereof while the connected members 2a and 2b having the through hole 27 formed in this manner are pressed by both the pressing members 20 and 21. For this purpose, the fifth
As shown in the figure, sealant application nozzles 31, 32
are advanced into the upper and lower openings of the through hole 27.

The first sealant application nozzle 31 is provided above the connected members 2a, 2b, and is fixed to the tip of the sealant supply pipe 34 by screwing. A spring 35 is inserted into the sealant application nozzle 31.
The sealant is supplied through a valve made up of a ball 36 that is compressed by the sealant, and is blown out from a sealant supply hole 37 formed at an angle to the nozzle axis at the tip of the nozzle 31. The tip surface of the nozzle 31 has a countersunk portion 2
It has a conical surface that fits the number 8. For example, four sealant supply holes 37 are provided at equal intervals in the circumferential direction. The sealant supplied from the sealant supply hole 37 is applied to the surface of the countersunk portion 28 of the through hole 27, and also flows to the inner surface of the through hole 27 below it.

The second sealant application nozzle 32 is fixed to the tip of the sealant supply pipe 39 by screwing, and the sealant is supplied upward into the application nozzle 32 through a valve consisting of a ball 41 pressed by a spring 40. The coating nozzle 32 has a protrusion 43 formed at the center of its tip, and the diameter of the protrusion 43 becomes smaller as it approaches the base.
3 has an outer diameter approximately equal to the inner diameter of the through hole 27. Therefore, the protrusion 43 is connected to the through hole 2.
7, a gap 44 is formed between the outer peripheral surface of the base of the protrusion and the inner wall of the through hole. Sealant supply holes 45 are formed at equal intervals on the outer periphery of the base of the protrusion 43 . An annular projection 46 surrounding a protrusion 43 is provided on the outer periphery of the tip of the nozzle 32, and an annular space 47 is formed at the outlet of the sealant supply hole 45.

Second application nozzle 3 for application of sealant
2 is advanced to the position shown in FIG. The inner wall surface of the hole 27 is also well coated. This is possible because the gap 44 widens downward due to the unique shape of the protrusion 43.

After the sealant is well applied to the through hole 27 and its vicinity as described above, both application nozzles 31,
32 is retracted, and then, as shown in FIG. 6, the lock pin 50 is inserted into the through hole 27 from above. This locking pin 50 is fed through the interior of the first pressing member 20. The lock pin 50 has a head 51 having a shape corresponding to the countersunk portion 28, and further has a thread 52 at the tip and a non-circular engagement portion 53 at the tip. The non-circular engagement portion 53 is a non-circular hole in this embodiment.

Next, as shown in FIG. 7, an anvil 56 guided within the sleeve 55 is lowered to press the top surface of the head of the lock pin 50 from above.

Then, as shown in FIG.
is pushed up from below through the inside of the lock collar drive shaft 22 and fitted onto the tip of the lock pin 50. The lock collar 60 has a female thread 61 and a thin weakened portion 62 in the middle. Although not shown in the figure, the lock collar 60 has a groove on its outer surface that slidably engages with the protrusion 23 of the lock collar drive shaft 22, and is guided by the protrusion 23 while being guided by the lock collar feeder 63. being pushed upwards.
Lock collar 6 pushed up to the position shown in Figure 8
0 is the non-circular cross-sectional inner surface 2 of the lock collar drive shaft 22
4. For this purpose, the cross-sectional shape of the lock collar 60 is made to be in close contact with the non-circular cross-sectional inner surface 24.

On the other hand, the lock pin fixing mandrel 65 is raised together with the lock collar 60, and the non-circular engaging portion 66 at the tip is connected to the non-circular engaging portion 53 of the lock pin 50.
the lock pin 50 from rotating.

In the state shown in Fig. 8, the lock collar drive shaft 22
When the lock collar 60 is rotated in the direction indicated by A in the same figure, the lock collar 60 is rotated in the screwing direction, and the lock collar 60 advances until its distal end surface contacts the surface of the connected member 1b, as shown in FIG.

When the lock collar 60 comes into contact with the surface of the connected member 2b, the screwing torque suddenly increases, so that the lock collar 60 is destroyed at the weakened portion 62. Therefore, when the lock collar drive shaft 22 is retracted, the main body of the lock collar 60 remains threaded into the lock nut 50, as shown in FIG. In this state, the previously applied sealant is interposed between the connected members 2a, 2b, the lock pin 50, and the lock collar 60, and performs a sealing action.

After the tightening rivet driving is completed in the above manner, both pressing members 20 and 21 are separated from the member to be tightened, as shown in FIG. Move the attachment member.

〔Effect of the invention〕

In the present invention, a lock collar drive shaft is provided inside the second cylindrical pressing member to make it hollow, the lock collar is fed through the inside and rotated for screwing into the lock pin, and the lock collar of the lock collar drive shaft is The mandrel for fixing the lock pin is inserted through the inside of the lock pin, and its tip is engaged with the non-circular engagement part of the lock pin, so all operations of feeding the lock collar, screwing in, and preventing rotation of the lock pin are performed immediately. This can be carried out efficiently through the interior of the cylindrical pressing member No. 2.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view of an apparatus for implementing the tightening fastener driving method of the present invention, FIG. 2 is a cross-sectional view of the main part of FIG.
FIG. 1 is a sectional view sequentially showing different states of the fastener driving process. 2, 2a, 2b... Connected member, 13... Riveter frame, 15... NC control device, 16...
Sequence controller, 20... first cylindrical pressing member, 21... second cylindrical pressing member, 22...
Lock collar drive shaft, 23...Protrusion, 24...Non-circular section inner surface, 26...Drilling drill, 27...Through hole, 28...Countersunk portion, 31...First sealant application nozzle, 32... Second sealant application nozzle, 37...Sealant supply hole, 43...Protrusion, 44...Gap, 45...Sealant supply hole,
46... annular projection, 47... annular space, 50...
Lock pin, 51... Head, 53... Non-circular engaging portion, 55... Sleeve, 56... Anvil, 60
...Lock collar, 61...Female thread, 62...Weakened part, 63...Lock collar feeder, 65...
Lock pin fixing mandrel, 66...non-circular engagement part.

Claims (1)

[Scope of Claims] 1. Connected members to be connected by driving rivets are stacked and supported, and a first cylindrical pressing member located on one side of the connected members in the direction of the driving rivet axis is advanced to cover the end faces of the members. While pressing against the surface of the connecting member, a second cylindrical pressing member located on the other side of the connected member and housing a hollow lock collar drive shaft rotatably and slidably in the axial direction is advanced. By pressing the end face against the surface of the connected member, the connected member is held under pressure from both sides by both pressing members, and the first
A drilling drill is advanced through the inside of the cylindrical pressing member to form a through hole with a countersunk portion on one side in the member to be connected, and a sealant is applied to the inner wall surface of the through hole and its vicinity. A threaded lock pin having a head corresponding to the shape of the countersunk portion at one end and a non-circular engagement portion at the other end is inserted into the through hole through the inside of the first cylindrical pressing member to lock the lock pin. The threaded part of the anvil is made to protrude to the other side of the through hole, and the anvil is advanced through the inside of the first cylindrical pressing member to come into contact with the head of the lock pin of the through hole, and has a female thread that is screwed into the thread of the lock pin. The lock collar is engaged with the inside of the lock collar drive shaft so that relative rotation does not occur, and the lock collar is advanced through the inside of the lock collar drive shaft and fitted into the threaded part of the lock pin, and the lock pin is inserted through the inside of the lock collar inside the lock collar drive shaft. By inserting a fixing mandrel and engaging its tip with the non-circular engagement part of the lock pin, rotation of the lock pin is prevented, and by rotating the lock collar drive shaft, the lock collar is rotated in the screwing direction and the lock pin is tightened. When the lock collar is screwed in, the first cylindrical pressing member and the second cylindrical pressing member are separated from the surface of the connected member, and the lock collar drive shaft and mandrel inside the second cylindrical pressing member are removed. A tightening fastener driving method consisting of also retracting the rivets. 2. The fastening fastener driving method according to claim 1, which comprises guiding the anvil in a sleeve that is advanceable inside the first cylindrical pressing member. 3. Claim No. 3 in which the groove of the lock pin is slidably engaged with the protrusion formed inside the lock collar drive shaft in the axial direction, thereby preventing relative rotation between the two. The tightening fastener driving method described in Section 1. 4 A weakened portion is formed in the middle of the lock collar in the axial direction, and the weakened portion is destroyed when screwing of the lock collar is completed to prevent the rotational force of the lock collar drive shaft from being transmitted to the lock pin. Tightening fastener driving method.