Tool for removing a blind fastener and associated method

Abstract

A dismantling tool (5) for a blind fastener joining a first mechanical part and a second mechanical part, the blind fastener extending along a fastening axis (X1) from an upstream to a downstream end, the dismantling tool (5) comprising: an anti-rotation member (51) having a passage opening (510) extending along a tool axis (X5) and a gripping surface (511) configured to cooperate with the female part of the blind fastener (1) from the upstream end in order to prevent its rotation about the fastening axis (X1), an interface member (7) connected to the anti-rotation member (51), the interface member (7) having a main body (77) including a through housing (4) extending along the tool axis (X5) which has an upstream opening (4A) configured to receive a cutting device (6) including a cutting member (61),the interface member (7) having an alignment groove (43) configured to guide the cutting member (61) in the passage opening (510) of the anti-rotation member (51). Figure from the abstract: Figure 3,

Description

Title of the invention: Tool for dismantling a blind fastener and associated method. Technical field

[0001] The present invention relates to the field of mechanical fasteners in the aeronautical field for assembling components, in particular, so-called "blind" fasteners, that is, fasteners mounted only from one side of the assembly. More specifically, the invention relates to a tool for dismantling a blind fastener.

[0002] An aircraft, as is known, comprises a fuselage made up of several mechanical parts assembled together. It is known to use blind fasteners to connect these mechanical parts, for example, rivets. Such blind fasteners allow for rapid assembly with few constraints, particularly in terms of accessibility.

[0003] With reference to [Fig. 1], the joining of a first mechanical part PI to a second mechanical part P2 by means of a blind fastener 1 to form an assembly is shown. For example, the mechanical parts PI, P2 are aeronautical panels that are to be assembled together. The blind fastener 1 typically comprises a female part 2 and a male part 3 inserted into the female part 2. When the blind fastener 1 is installed, a rotation is applied to the male part 3, which screws into the female part 2 to form a bulb 22 on the downstream side C2, in contact with the second mechanical part P2. The mechanical parts PI, P2 are thus joined and held, on the upstream side C1 by the head with recesses 21 of the female part and, on the downstream side C2, by the bulb 22 as illustrated in [Fig. 1].

[0004] During maintenance operations, for example to bring the fasteners used up to standard or to correct a problem on an isolated part of a panel, the blind fasteners 1 must be removed. When removing a blind fastener 1, the male part 3 is first removed. For example, the male part 3 can be removed by freeing the thread of the male part 3 on the downstream side C2 and driving the male part 3 towards the upstream side Cl, usually with a pin punch.

[0005] Only the female part 2 then needs to be removed, as it is still held in place by its impression head 21 and its bulb 22. Removing the female part 2 is critical during the service life of a panel composed of several mechanical parts P1, P2, as the slightest roughness or scratch can lead to non-conformity and generate high costs. It is known to use a drill to machine the female part 2 in order to break its crown. This operation is complex since the female part 2 is rotated with the cutting element of the drill. Therefore, it is necessary A second operator holds the female part 2 in rotation from the downstream side C2 while the first operator performs the drilling operation. This removal method is therefore highly susceptible to human error due to the number of operators involved. Indeed, a slip or misalignment can force the discarding of one of the previously connected mechanical parts PI, P2. Disassembling the female part 2 also has the disadvantage of imposing a slow disassembly rate.

[0006] The invention thus aims to eliminate these disadvantages, by allowing a higher dismantling rate and increased reliability. PRESENTATION OF THE INVENTION

[0007] The invention relates to a tool for dismantling a blind fastener joining a first mechanical part and a second mechanical part, the blind fastener having been introduced from upstream to downstream into an opening in the first part and then into an opening in the second part from an upstream side, the blind fastener extending along a fastening axis, the blind fastener comprising a female part extending into the openings and a male part inserted into the female part in order to deform it to join the mechanical parts, the dismantling tool comprising: • an anti-rotation member comprising a passage opening extending along a tool axis and a gripping surface configured to cooperate with the female part of the blind fastener from upstream in order to prevent its rotation around the fastening axis, • an interface member connected to the anti-rotation member, the interface member comprising a main body including a through housing extending along the tool axis which includes an upstream mouth configured to receive a cutting device including a cutting member, the interface member including an alignment groove configured to guide the cutting member in the passage opening of the anti-rotation member.

[0008] Thanks to the invention, a blind fastener can be quickly and easily removed by a single operator. This advantageously increases the removal rate of blind fasteners while reducing the physical strain on the operator. The use of an anti-rotation device combined with an interface device prevents any rotation from the same side by the same operator while ensuring precise and secure positioning. The cutting device is advantageously not likely to damage any of the mechanical parts.

[0009] According to one aspect, the disassembly tool includes a stabilizing element configured to bear against the first mechanical part. This ensures coaxiality between the fixing axis and the tool axis in order, in particular, to prevent damage the first mechanical part and allow for precise disassembly.

[0010] According to one aspect, the stabilizing member comprises at least three support arms, the distal ends of the arms defining a plane orthogonal to the axis of the device. Three arms are sufficient to ensure stabilization.

[0011] In one aspect, the anti-rotation member is screwed to the interface member. Preferably, the anti-rotation member comprises a threaded portion, and the interface member comprises an internally tapped portion configured to receive the threaded portion of the anti-rotation member. This allows the two members to be easily joined and disassembled for repair. Furthermore, it allows the same interface member to be used for different sizes of anti-rotation members, and vice versa, thus enabling simple adaptation of the disassembly tool.

[0012] In one aspect, the stabilizing member is screwed onto the interface member. Preferably, the stabilizing member comprises a threaded portion, and the interface member comprises an external threaded portion configured to receive the threaded portion of the support member. In another aspect, the stabilizing member can be slid onto the interface member and its translation limited by the anti-rotation member. This allows the two members to be easily joined and disassembled for repair. Furthermore, it allows the same interface member to be used for different stabilizing member designs, and vice versa, thus enabling simple adaptation of the disassembly tool.

[0013] According to one aspect, the main body of the interface member has a plurality of evacuation recesses, preferably extending radially with respect to the tool axis. Preferably, the evacuation recesses are distributed circumferentially around the device axis. This allows chips to be evacuated from the blind clamp throughout the disassembly operation, thus avoiding pauses necessary for cleaning the disassembly tool and thereby increasing the disassembly rate.

[0014] The invention also relates to an assembly of a cutting device comprising a cutting element and a dismantling tool as previously presented, the cutting device being introduced at least partially into the through housing, the cutting element extending into the alignment groove of the dismantling tool.

[0015] According to one aspect, the cutting device includes a micrometric stop. This allows the stroke of the cutting tool to be adjusted so as not to damage the first mechanical part during the disassembly operation, by cutting only the head with the impressions of the female part of the blind fastener.

[0016] According to one aspect, the cutting device is attached to the dismantling tool, preferably by screwing. This allows for greater safety in use and reduces the risk of accidents related to potential slippage of the cutting device or of the dismantling tool. This also makes it easier and faster to repeat the dismantling operation from one mechanical part to another, thus increasing the dismantling rate.

[0017] The invention also relates to a method of using an assembly described above for dismantling a blind fastener joining a first mechanical part and a second mechanical part, the blind fastener having been inserted from upstream to downstream into an opening in the first part and then into an opening in the second part from an upstream side, the blind fastener extending along a fastening axis, the blind fastener comprising a female part extending into the openings and a male part inserted into the female part in order to deform it to join the mechanical parts, the male part of the fastener having been previously removed, the cutting element being retracted in the dismantling tool, the method comprising steps consisting of: • Ensure the anti-rotation device's attachment surface cooperates with the female part of the blind fastener from the upstream side to prevent its rotation around the fixing axis. • Move the cutting organ downstream so that it cuts an upstream end of the female part of the blind fixation.

[0018] According to one aspect, the method includes a preliminary step to the cooperation of the gripping surface, consisting of making the cutting tool cooperate with the blind fixing. Preferably, the cutting tool protrudes a few millimeters from the anti-rotation member.

[0019] According to one aspect, the method includes a step of stabilizing the position of the tool axis so that it is coaxial with the fixing axis.

[0020] According to one aspect, the main body of the interface element having a plurality of discharge recesses, the method of use includes a step of dischargeing the cutting waste via the discharge recesses. PRESENTATION OF FIGURES

[0021] The invention will be better understood upon reading the following description, given by way of example, and referring to the following figures, given by way of non-limiting examples, in which identical references are given to similar objects.

[0022] Fig. 1 is a schematic representation of a cross-sectional view of a blind fastener connecting two mechanical parts.

[0023] Figure 2 is a schematic representation of a cross-sectional view of a tool dismantling according to one embodiment of the invention.

[0024] Figure 3 is a schematic representation of an exploded cross-sectional view of the tool dismantling of the [Fig.2].

[0025] Figure 4 is a schematic representation of a positioning step of a cutting device comprising a disassembly tool

[0026] Fig. 5 is a schematic representation of a step in moving the drill bit of the cutting device in the blind fastener to be disassembled.

[0027] Fig. 6 is a schematic representation of a step in removing the drill bit from the blind fixing.

[0028] Fig. 7 is a schematic representation of a step in the withdrawal of the female part of the blind fixation.

[0029] It should be noted that the figures set out the invention in detail to implement the invention, said figures being of course able to serve to better define the invention where appropriate. DETAILED DESCRIPTION OF THE INVENTION

[0030] The invention relates to a tool for dismantling a blind fastener of an assembly, hereinafter referred to as "fastener". A blind fastener is by definition a fastener that is mounted from only one side of the assembly, for example, a rivet.

[0031] With reference to [Fig. 1], the joining of a first mechanical part PI to a second mechanical part P2 by means of a fastener 1 in order to form an assembly is shown. By way of example, the mechanical parts PI, P2 are aeronautical panels that must be assembled together.

[0032] In this example, the first mechanical part PI has an opening 01 and the second mechanical part P2 has an opening 02, which are aligned along a fixing axis XI oriented from upstream to downstream. The upstream side thus corresponds to the side of the first mechanical part PI, while the downstream side corresponds to the side of the second mechanical part P2.

[0033] With reference to [Fig. 1], the fastener 1 was inserted along the fastening axis XI from upstream to downstream into the opening 01 of the first mechanical part PI and then into the opening 02 of the second mechanical part P2 from an upstream side C1 to a downstream side C2. The fastener 1 typically comprises a female part 2, having an outside diameter D2, and a male part 3 inserted into the female part 2. The male part 3 is secured to the female part 2, usually by a thread in the male part 3 that complements a tapped hole formed in the female part 2. The male part 3 is inserted into the female part 2 in order to deform it to secure the mechanical parts PI and P2.

[0034] The female part 2 has, at its upstream end, a head with impressions 21 having impressions used to hold it and prevent its rotation during the application of the fastener 1, in particular, during the placement of the male part 3. In In this example, the impression head 21 contains impressions, for example, of pyramidal teeth. It goes without saying that the impressions could have different shapes.

[0035] Indeed, during the fitting of the attachment 1, a rotation is applied to the male part 3 which screws into the female part 2 from the upstream side Cl until it exerts an upstream pull at the downstream end of the female part 2. Due to its shape and configuration, the downstream end of the female part 2 deforms to form a bulb 22 on the downstream side C2, in contact with the second mechanical part P2. The mechanical parts PI, P2 are thus linked and held, on the upstream side Cl by the impression head 21 of the female part and, on the downstream side C2, by the bulb 22 as illustrated in [Fig. 1].

[0036] When disassembling a fastener 1, the male part 3 is first removed. This disassembly step is known to those skilled in the art and will not be described in detail. By way of example, the male part 3 can be removed by freeing the thread of the male part 3 on the downstream side C2 and driving the male part 3 towards the upstream side Cl, usually with a pin punch. Only the female part 2 then needs to be removed, as it is still held in place by its head with recesses 21 and its bulb 22.

[0037] A dismantling tool 5 will now be presented according to an embodiment of the invention allowing a quick and simple dismantling of the female part 2 of the fastener 1.

[0038] With reference to [Fig. 2], a dismantling tool 5 is shown according to one embodiment of the invention. The dismantling tool 5 extends along a tool axis X5 from an upstream to a downstream end, and comprises, from upstream to downstream, an interface member 7, a stabilizing member 52, and an anti-rotation member 51. The stabilizing member 52 is optional and will be described later.

[0039] With reference to [Fig. 3], the anti-rotation member 51 extends along the tool axis X5 and includes a passage opening 510 extending along the tool axis X5, preferably at its center. The passage opening 510 has a diameter D510 of between 2 mm and 7 mm. In this example, the anti-rotation member 51 is in the form of a cylindrical part having a thickness of between 5 mm and 25 mm and a diameter of between 5 mm and 25 mm. Preferably, the anti-rotation member 51 is made of metal, in particular, steel.

[0040] The anti-rotation member 51 further includes a gripping surface 511 (forming a downstream surface of the anti-rotation member 51) configured to cooperate with the impression head 21 of the female part 2 from the upstream side Cl in order to prevent its rotation around the fixing axis XL. Preferably, the gripping surface 511 includes a plurality of grips complementary to the impressions present on the impression head 21 of the female part 2, facilitating cooperation between the female part 2 and the disassembly tool 5.

[0041] In this example, the anti-rotation member 51 further comprises a connecting portion 512 extending downstream, configured to allow connection with the interface member 7, in particular, by screwing. In this example, the connecting portion 512 is threaded and configured to cooperate with a connecting portion 44, which includes a tapped hole 73, of the interface member 7.

[0042] With further reference to [Fig. 3], the disassembly tool 5 comprises a stabilizing member 52 which is positioned between the interface member 7 and the anti-rotation member 51. In this example, the stabilizing member 52 is mechanically connected to the interface member 7, preferably by screwing. Alternatively, the stabilizing member 52 can also be mounted by axial clamping between the anti-rotation member 51 and the interface member 7.

[0043] The stabilizing member 52 is configured to bear against the first mechanical part PI so as to advantageously stabilize the dismantling tool 5. Preferably, the stabilizing member 52 comprises a circular opening 520 extending along the axis of the tool X5 so as to form a passage between the anti-rotation member 51 and the interface member 7.

[0044] In this example, the stabilizing member 52 comprises three support arms 522 having a radial component with respect to the tool axis X5 so as to ensure stable support. It is understood that the number of support arms 522 could be greater. The use of three support arms 522 ensures stable support when the anti-rotation member 51 cooperates with the female part 2 of the clamping 1.

[0045] With further reference to [Fig. 3], the interface member 7 comprises a through housing 4 extending along the tool axis X5, configured to receive a cutting device 6 (shown in [Fig. 4]). In this example, the interface member 7 is shown as a single main body 77, but it is understood that it could comprise a plurality of modular bodies assembled together.

[0046] The through housing 4 includes an upstream mouth 4A and a downstream mouth 4B. The through housing 4 comprises, from upstream to downstream, a connecting portion 41, a median portion 42, an alignment groove 43 and a linking portion 44.

[0047] Preferably, the connection portion 41 of the interface member 7 is configured to receive the cutting device 6, which will be described subsequently. In this example, the connection portion 41 includes an upstream thread 76 to allow the cutting device 6 to be screwed in, thus enabling precise positioning and alignment. The connection portion 41 forms a stable connection interface allowing for repeatable connection of the cutting devices 6.

[0048] In this example, the median portion 42, directly downstream of the connection portion 41, is configured to receive a part of the cutting device 6. Preferably, the middle portion 42 of the interface member 7 comprises a plurality of evacuation recesses 75, preferably extending radially with respect to the tool axis X5. These evacuation recesses 75 advantageously allow the material chips cut by the cutting device 6 to be evacuated, as will be shown later.

[0049] The alignment groove 43 is configured to guide the cutting device 6 in the passage opening 510 of the anti-rotation member 51. In this example, the alignment groove 43 is radially delimited by an annular ring defining, downstream, a transverse wall 430 suitable for forming a stop when mounting the anti-rotation member 51 in the interface member 7.

[0050] Preferably, the alignment groove 43 has a diameter D43 which is equal to + / - 10% of the diameter D510 of the passage opening 510 of the anti-rotation member 51.

[0051] The interface member 7 further comprises a linking portion 44, at the downstream end of the interface member 7, mechanically connected to the linking portion 512 of the anti-rotation member 51.

[0052] In this example, the interface member 7 is connected to the stabilizing member 52 by screwing. In particular, the interface member 7 has a second thread 74 formed on an outer surface of the connecting part 44 of the interface member 7 which cooperates with a tapped hole 521 formed on an inner surface of the annular opening 520 of the stabilizing member 52.

[0053] The dismantling tool 5 can thus be conveniently assembled by screwing as illustrated in [Fig.2].

[0054] The use of the dismantling tool 5 with a cutting device 6 will now be presented in order to allow the removal of the female part 2 of the fastener 1.

[0055] In this example, the cutting device 6 is generally in the form of a drill. With reference to [Fig. 4], the cutting device 6 extends along a cutting axis X6 and comprises a cutting element 61, for example, a rotating drill bit, whose axial position along the cutting axis X6 can be modified by a predetermined stroke. The cutting device 6 includes a support member 62 in which the cutting element 61 is mounted and which is capable of being driven in rotation about the cutting axis X6. The support member 62 is connected to a rotation drive motor. In this example, the cutting device 6 includes an adjustment device, in particular a micrometer stop 63, connected to the support member 62, configured to adjust the stroke CD of the cutting element 61 and thus prevent damage. The support member 62 is able to extend into the middle portion 42 of the interface member 7.The micrometric stop 63 is suitable for extending into the connection portion 41 of the interface member 7, in particular by screwing.

[0056] In this example, the cutting member 61 has a cutting diameter D61 which is less than the outside diameter D2 of the female part 2 but greater than the inside diameter D2 of the female part 2. The cutting diameter D61 is less than the diameters D510, D43 in order to allow the cutting member 61 to reach the female part 2 of the fastener 1.

[0057] The method of using a dismantling tool 5 according to the invention will now be presented

[0058] With reference to Figures 3 and 4, the cutting device 6 is inserted into the dismantling tool 5 through the opening 4A of the interface member 7, from upstream to downstream. The cutting member 61 is guided by the alignment groove 43 until it extends into the opening 510 of the anti-rotation member 51 of the dismantling tool 5. The micrometer stop 63 is screwed onto the connection portion 41 of the interface member 7. The support member 62 extends into the middle portion 42 of the interface member 7 as illustrated in [Fig. 4]. The tool axis X5 is thus advantageously aligned with the cutting axis X6.

[0059] If an operator exerts an axial force on the cutting device 6, the support member 62 can move downstream along a displacement stroke CD which is determined by the setting of the micrometric stop 63. As an example, the displacement stroke CD is between 10mm and 30mm.

[0060] Preferably, in the absence of axial force applied by the operator, the cutting element 61 is in the retracted position PR as illustrated in [Fig. 4]. The downstream end of the cutting element 61 is located at a first distance Da from the gripping surface 511 of the anti-rotation element 51. The first distance Da is less than the travel stroke CD. For example, the first distance Da is between 10 mm and 20 mm. Advantageously, the downstream end of the cutting element 61 is retracted into the passage opening 510 during handling of the cutting device 6 assembled with the disassembly tool 5. Any risk of unintentional impact or scratching can thus be avoided.

[0061] Still referring to [Fig. 4], the dismantling tool 5 is then brought into contact by its gripping surface 511 of the anti-rotation member 51 ([Fig. 3]) with the grooved head 21 of the female part 2 of the fastener 1 to be dismantled from the upstream side CL. The lugs of the gripping surface 511 cooperate with the grooves of the grooved head 21, so as to advantageously prevent any slippage or sliding of the dismantling tool 5. Preferably, the cutting tool protrudes a few millimeters from the anti-rotation member and cooperates preliminarily with the blind fastener before the gripping surface 511 of the anti-rotation member 51 cooperates. This allows for optimal alignment.

[0062] The support arms 522 are brought into contact with the first mechanical part PI, ensuring stability for the disassembly tool 5. The tool axis X5 is thus advantageously aligned with the fixing axis XI and with the cutting axis X6. The alignment of the three axes XI, X5, X6 is advantageously ensured, on the one hand, by the complementary gripping surface 511 of the impression head 21 of the female part 2 and, on the other hand, by the contact of the support arms 522 of the stabilizing member 52 with the first mechanical part PL

[0063] With reference to [Fig. 5], the cutting element 61 is rotated and an operator applies an axial force EFF to the cutting device 6, which moves the cutting element 61 downstream along the travel stroke CD. The cutting element 61 is in the extended position PS as illustrated in [Fig. 5]. The downstream end of the cutting element 61 is located at a second distance Db from the gripping surface 511 of the anti-rotation element 51. By way of example, the second distance Db is between 0.5 mm and 10 mm. The downstream end of the cutting member 61 is advantageously projecting so as to penetrate the female part 2. During rotation of the cutting member 61, the upstream end of the female part 2, prevented from rotating by the anti-rotation member 51, detaches into chips which are evacuated through the evacuation recesses 75 of the interface member 7.

[0064] With reference to [Fig. 6], when the operator stops applying axial force EFF to the cutting device 6, the cutting element 61 is again in the retracted position PR. The dismantling tool 5 associated with the cutting device 6 can then be moved away from the fastener 1 to dismantle another fastener in a quick and similar manner.

[0065] With reference to Figures 6 and 7, cutting the upstream end of the female part 2 eliminates its axial retention upstream of the first mechanical part PL. This advantageously allows the impression head 21 to be separated from the rest of the female part 2 using very little force and quickly, without any risk of damage. Furthermore, since the entire operation takes place on the upstream side Cl, only one operator is required to handle the disassembly tool 5 and remove the female part 2 from the fastener 1.

[0066] Thanks to the disassembly tool 5 according to the invention, disassembling the female part 2 of a fastener 1 is faster, simpler, and more ergonomic. The disassembly rate can advantageously be doubled since it now requires only one operator, compared to two according to the prior art. Finally, quality problems related to unintentional damage are eliminated.

Claims

Demands

1. Assembly of a cutting device (6) comprising a cutting member (61) and a dismantling tool (5) for a blind fastener (1) securing a first mechanical part (PI) and a second mechanical part (P2), the dismantling tool (5) being mounted by screwing onto the cutting device (6), • the blind fastener (1) having been introduced from upstream to downstream into an opening (01) of the first part (PI) then into an opening (02) of the second part (P2) from an upstream side (Cl), the blind fastener (1) extending along a fixing axis (XI), the blind fastener (1) comprising a female part (2) extending into the openings (01, 02) and a male part (3) inserted into the female part (2) in order to deform it to secure the mechanical parts (PI, P2), • the dismantling tool (5) comprising: • an anti-rotation member (51) comprising a passage opening (510) extending along a tool axis (X5) and a gripping surface (511) configured to cooperate with the female part (2) of the blind fixing (1) from the upstream (Cl) in order to prevent its rotation around the fixing axis (XI), • an interface member (7) connected to the anti-rotation member (51), the interface member (7) comprising a main body (77) including a through housing (4) extending along the tool axis (X5) which has an upstream opening (4A) configured to receive a cutting device (6) including a cutting member (61), the interface member (7) comprising a connecting portion (41), a middle portion (42), an alignment groove (43) and a linking portion (44), the alignment groove (43) being configured to guide the cutting member (61) in the passage opening (510) of the anti-rotation member (51), the linking portion (44), at the downstream end of the interface member (7), being mechanically connected by screwing to a linking portion (512) of the anti-rotation member (51), the cutting device (6) being inserted at least partially into the through housing (4), the cutting member (61) extending into the alignment groove (43) a stabilizing member (52) configured to bear against the first mechanical part (PI), the stabilizing member (52) being positioned between the interface member (7) and the anti-rotation member (51).

2.

3.

4.

5. Assembly according to claim 1, wherein the stabilizing member (52) comprises at least three support arms (522) Assembly according to any one of claims 1 to 2, wherein the main body (77) of the interface member (7) has a plurality of drainage recesses (75), preferably extending radially with respect to the tool axis (X5). Assembly according to any one of claims 1 to 3, wherein the cutting device (6) includes a micrometric stop (63). A method for using an assembly according to any one of claims 1 to 4 for dismantling a blind fastener (1) joining a first mechanical part (PI) and a second mechanical part (P2), the blind fastener (1) having been inserted from upstream to downstream into an opening (01) of the first part and then into an opening (02) of the second part from an upstream side (Cl), the blind fastener (1) extending along a fastening axis (XI), the blind fastener (1) comprising a female portion (2) extending into the openings (01, 02) and a male portion (3) inserted into the female portion (2) in order to deform it to join the mechanical parts (PI, P2), the male portion (3) of the fastener (1) having been previously removed, the cutting element (61) being retracted in the dismantling tool (51), the method comprising steps consisting of: To make the attachment surface (511) of the anti-rotation organ (51) cooperate with the female part (2) of the blind fixation (1) from the upstream side (Cl) in order to prohibit its rotation around the fixation axis (XI), Move the cutting organ (61) downstream so that it cuts an upstream end of the female part (2) of the blind attachment (1).

6. Method of use according to claim 5, comprising a step of • Stabilizing the position of the tool axis (X5) so that it is coaxial with the fixing axis (XI).

7. Method of use according to claim 6, the main body (77) of the interface member (7) having a plurality of discharge recesses (75), the method comprising a step of dischargeing the cutting waste via the discharge recesses (75).

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