Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
  • F16B19/04—Rivets; Spigots or the like fastened by riveting
  • F16B19/08—Hollow rivets; Multi-part rivets
  • F16B19/083—Self-drilling rivets
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
  • F16B19/04—Rivets; Spigots or the like fastened by riveting
  • F16B19/08—Hollow rivets; Multi-part rivets
  • F16B19/086—Self-piercing rivets

Definitions

• the invention relates to a self-piercing rivet, comprising a support flange and an expandable hollow tubular body, the body comprising at one end a first cylindrical portion adjacent to the flange and at the other end of the body a second cylindrical portion arranged for receiving a piercing member, and a third expandable portion between the first and second cylindrical portions.
• the drilling end self ankles ⁇ drills increases the size of the ankle when the latter is attached to the elements to be fixed.
• the self-drilling dowels currently used generally have an ankle body and ankle ends with orifices. These orifices do not make it possible to ensure a seal from one side to the other of the elements to be assembled connected by the self-drilling plugs of the prior art.
• the object of the invention is to propose a self-piercing rivet less cumbersome, non-aggressive, limiting the release of residues during drilling while being compatible with the constraints of the automotive industry for assemble two elements.
• the invention relates to a self-piercing rivet, comprising a support flange and an expandable hollow tubular body, the body comprising at one end a first cylindrical portion adjacent to the flange and at the other end of the body a second cylindrical portion arranged to receive a piercing member, and a third expandable portion between the first and second cylindrical portions, characterized in that the third portion of the body and the piercing member each comprise connecting means which are arranged to disengage the piercing element from the body during the expansion of the third part of the body.
• the self-piercing rivet according to the invention can still have the following particularities:
• the hollow tubular body may have a solid axial wall
• the body may have a bottom on the side of the second cylindrical portion
• the second cylindrical portion may be threaded internally
• the third expandable portion may be arranged to deform radially when the second cylindrical portion threaded internally is driven by traction in axial translation to the flange;
• the second cylindrical portion may be arranged to receive a cylindrical rod extending axially in the body
• the stem may comprise at one end a first portion of stem which extends in the first part of the hollow body and which projects beyond the collar to the outside of the body;
• the rod may comprise at the other end a second rod portion arranged to be housed in the second body part, the second rod portion has a shoulder for cooperating with a narrowing section of the second body part so as to be blocked axially in the body;
• the third expansible portion of the body may be arranged to deform radially when the first portion of the rod is driven by traction in axial translation;
• the shank may comprise a third shank portion between the first and second shank portions with a breakable area, the third portion of the shank is arranged such that a portion of the third shank portion is inserted into the first portion of the shank body when the third part of the body is completely expanded radially;
• portion of the third rod portion may be limited by the breakable zone disposed flush with the flange when the third portion of the body is completely expanded radially;
• the piercing member may be in the form of a hollow cylinder for engaging with a first end on the second cylindrical portion of the body;
• the second body portion may have flats for locking a rotation of the piercing member relative to the body when the piercing member is fitted on the body;
• the piercing element may have on a second end a drilling tool in the form of a hole saw;
• the hollow cylinder of the piercing member may have ridges projecting inwardly of the hollow cylinder between the first end and the second end of the piercing element to block the engagement of the hollow cylinder on the second cylindrical portion of the body ;
• the piercing element may have first means of connection to the body
• the first means for connecting the piercing member to the body may be in the form of flexible tabs extending axially beyond the first end;
• the flexible lugs of the piercing member may have an abrasive outer surface
• the third expandable portion of the body may have second connecting means to the piercing element
• the second connecting means of the third expansible part of the body with the piercing element may be in the form of notches arranged to receive the flexible lugs of the piercing element;
• the rivet may be of rolled and welded sheet
• the rivet may be of stamped sheet metal.
• the self-piercing rivet With the self-piercing rivet according to the invention, it is possible to quickly and easily assemble two plates together, or a part to a support.
• the plates can also be automotive floor mats. With this arrangement according to the invention, it is possible to obtain a fastener having a reduced bulk and a less aggressive rivet structure for an operator.
• the collar bears against the upper element to be assembled, and then a traction in axial translation on the tool causes the radial expansion of the body then performing an automatic simultaneous ejection of the body piercing element pushed by the deformation of the third part of the rivet body.
• the ejection of the piercing element allows an operator to continue working without risk of injury to the piercing tool and decreases the space occupied by the rivet.
• the assembly of two elements including the steps of drilling and anchoring the self-piercing rivet on both sides of the two plates, can be quick and simplified because it can be achieved in a single operation with a screwing tool / adapted traction.
• the arrangement of the piercing element, with the abrasive zone and the hollow cylinder, respectively makes it possible to make "clean" holes and to contain in the piercing element the release of dust and drilling debris.
• a "material slab” will be ejected from the rivet body at the same time as the piercing member.
• the rivet body with the threaded portion having a bottom and a solid wall or with a rod portion ensures a seal from one side to the other of the elements to be assembled.
• a portion of the third portion of the rod is partially blocked in the first portion of the body adjacent to the collar completely filling the first portion of the rivet body to strengthen the structure of the expanded rivet. Additional axial traction and calibrated on the rod causes the breaking of the rod at the breakable zone so that the broken rod does not protrude from the collar, it is flush with the flange.
• the sheet metal rivet with the expanded body comprising a rod portion provides high mechanical resistance to tearing and shearing to meet the constraints of the automotive industry.
• FIG. 1 is a perspective view of the self- piercing rivet according to a first embodiment of the invention
• Figure 2 is an exploded view of the self-piercing rivet of Figure 1;
• FIG. 3 is a side view of the self- piercing rivet according to the first embodiment of the invention.
• Figure 4 is an axial sectional view of the self-piercing rivet of Figure 3;
• FIG. 5 is an axial sectional view of the self-piercing rivet with the radially expanded body according to the first embodiment of the invention
• FIG. 6 is a perspective view of the self- piercing rivet according to a second embodiment of the invention
• Figure 7 is an exploded view of the self-piercing rivet of Figure 6;
• Figure 8 is a side view of the rivet auto ⁇ piercer according to the second embodiment of the invention.
• Figure 9 is an axial sectional view of the self-piercing rivet of Figure 8.
• Figure 10 is an axial sectional view of the self-piercing rivet with the radially expanded body according to the second embodiment of the invention. Description of embodiments
• Figures 1 to 5 illustrate a rivet 1 according to a first embodiment of the invention for assembling two elements, here two plates (P and P ', shown in Figure 5).
• the plates may be fiberglass.
• the rivet 1 comprises a tubular body 2 with at one end a flange 3 abutting for example on one of the plates to be assembled and at the other end of the body 2 a zone (described below) on which comes to coordinate by fitting a piercing element 4 visible in isolation in exploded FIG. 2.
• the flange 3 extends in a plane perpendicular to an axis AA of the rivet 1.
• the flange 3 may have notches (not shown) coming to bite the bearing surface to block its axial rotation.
• the collar 3 can also have cutouts around an inlet port within the tubular body 2.
• the tubular body 2 is hollow and is barrel-shaped or barrel-shaped with a solid axial wall.
• the body 2 comprises three parts extending along the axis AA: a first cylindrical portion adjacent to the flange 3, a second cylindrical portion 6 corresponding to the zone of arrangement of the piercing element 4 by axial fitting, and a third portion 7 intermediate between the two parts 5, 6 cylindrical.
• the height of the first cylindrical portion generally corresponds to the thickness of the plates P, P 'to be assembled.
• the second cylindrical portion 6 may be threaded internally to cooperate with the thread of a screwdriver passing through the tubular body 2 through the orifice of the collar 3.
• the internal threading comes from a threaded bush 8 threaded and fixed to the second part 6, below a radial sectional shrinkage forming a shoulder 20.
• the sleeve 8 is fixed to the body 2 by welding or crimping.
• the outer surface of the second cylindrical portion 6 may have flats 9 extending axially, here three flats 9 are present, to facilitate the fitting of the piercing element 4 on the second portion 6 of the body 2 rivet and block the rotation of the piercing element 4 relative to the rivet body 2.
• the second cylindrical portion 6 of the rivet body 2 may have a bottom wall, as illustrated in FIG. 4.
• the third intermediate portion 7 of the rivet body 2 is here in the form of a stamped barrel with an annular weakening zone 10 in a median transverse plane so that the third portion 7 of the body 2 is radially expandable.
• the third expandable intermediate portion 7 of the rivet body 2 has first connecting means 11 with the piercing element 4.
• three notches 11 projecting towards the inside of the body 2 are arranged in axial continuity with the flats 9 of the second part 6 of the rivet body 2.
• the piercing element 4 is in the form of a hollow cylinder which can be moved by a first end 12 on the second cylindrical part 6 of the body 2.
• the cylindrical inner face of the piercing element 4 has ridges 13, visible in Figure 4, which project inwardly of the cylinder for axially locking the second portion 6 of the rivet body 2 when the piercing element 4 is fitted on the second cylindrical portion 6 of the body 2.
• the piercing element 4 has on a second end a piercing tool 14, here in the form of a circular hole saw with a two-stage toothing.
• the hole saw has an internal bore with teeth distributed circumferentially around the bore to reduce dust and tearing of the fiber during drilling. During drilling, the material residues accumulate in the hollow cylinder of the piercing element 4.
• the second end of the piercing tool 14 could be a drill bit type tip with a diamond coating (not shown).
• the piercing element 4 has second connecting means 15 to the rivet body 2 and more particularly to the third intermediate portion 7 of the rivet body 2, here for example in the form of flexible lugs extending axially beyond the first end 12 of the piercing element 4.
• the flexible tabs of the piercing element 4 here have an abrasive outer surface for improving the quality of the piercing and the inclined ends 16 towards the inside of the piercing element 4.
• the piercing element 4 of the rivet 1 self-piercing must be mounted on the body 2 of rivet 1.
• the flexible tabs 15 diverge in contact with the second part 6 and slide along the flats 9 of the second portion 6 of the body 2 rivet 1.
• the second cylindrical portion 6 sinks axially into the hollow cylinder of the piercing element 4 until the inclined ends 16 of the flexible lugs 15 become lodged in the notches 11 of the third expansible part 7 of the rivet body 2.
• the rivet body 2 is axially locked in the cylinder hollow of the piercing element 4 by the inner edges 13 protruding from the piercing element 4.
• the first and second connecting means 11, 15 must be chosen so as to resist the rotation applied to the rivet 1 during drilling.
• the flats 9 on the second part 6 of the body 2 also make it possible to block in rotation the piercing element 4 with respect to the body 2 of rivet 1 when the piercing element 4 is fitted to the body 2 of rivet 1 and thus transmit the rotation, exerted by a screwing tool on the body 2 of rivet 1, to the piercing element 4.
• P 'to assemble them is effected by driving the rivet 1 in rotation in the conventional direction of screwing, by action of the tool with the sleeve 8, the tool passing through the collar 3, to make a hole in the two plates P, P 'and assemble them according to FIG.
• the third portion 7 of the body 2 When the third portion 7 is fully expanded, as shown in Figure 5, the third portion 7 of the body 2 then forms a bead 17 under the plates P, P 'assembled.
• the bead 17 provides better mechanical resistance to tearing and shearing.
• the rivet 1 is then anchored on both sides of the two plates P, P '.
• the abrasive outer surface of the flexible lugs of the piercing member 4 allows sanding of the interior of the hole to remove protruding fibers and / or locally delaminated areas.
• FIGs 6 and 7 illustrate a rivet according to the second embodiment of the invention, to assemble two elements, here the two plates (P and P ', shown in Figure 10).
• the rivet 1 comprises the tubular hollow tubular body 2 with the solid axial wall, the first, second and third cylindrical portions 5, 6, 7 extending along the axis AA, the collar 3 and the zone on which The drill element 4 is arranged in an isolated manner in FIG. 7 as shown.
• the rivet comprises a rod 18, here generally cylindrical as seen in isolation in FIG.
• the rod 18, to be inserted in the rivet body 2 comprises three parts extending along the axis AA: a first part 19 of the rod 18 intended to be inserted into the first part 5 of the rivet body 2 and which has a length so that it projects also beyond the flange 3 outside the rivet body 2; a second portion 21 of the rod 18 for housing in the second portion 6 of the rivet body 2 '; and a third portion 22 between the first and second portions 19, 21 of the rod 18 which is housed in the third portion 7 of the rivet body 2.
• the projecting portion of the first portion 19 of the rod 18 relative to the rivet body 2 will be used to drive the rivet in rotation in the conventional direction of screwing, by action of the tool with this part extending to the outside of the body 2, but also in axial tension.
• the second portion 21 of the rod 18 is here in the form of a nose with a shoulder 23 which cooperates with the narrowing of the section 20 of the second portion 6 of the body 2 forming the shoulder for axially locking the rod 18 in the body 2 of rivet the.
• Second flats (not visible) of the body 2 present, counter-form in particular, on the inner surface of the second portion 6 of the rivet body 2 will block, by cooperation with the second portion 21 of rod 18, the rotation of the rod 18 relative to the rivet body 2.
• the body 2 and the rod 18 are secured in axial rotation.
• the third portion 22 of the rod 18 here has a narrowing zone corresponding to a breakable zone 24 under the effect of an appropriate axial traction.
• the piercing element 4 engages the second cylindrical portion 6 of the rivet body 2 in the same manner as previously described.
• the establishment of the rivet in the two plates P, P 'to assemble them operates by driving the rivet in rotation in the conventional direction of screwing, by action of the tool with the rod 18, to make a hole in the two plates P, P 'and assemble them according to FIG.
• the second part 6 of the body 2 is brought up by pulling the tool on the rod 18, to the flange 3, which causes the radial deformation of the third expandable part 7 thus releasing by automatic ejection the piercing element 4 of the rivet body 2.
• the mechanical resistance to tearing and shearing is reinforced by the presence of a portion of the third portion of 22 of the rod 18 at the first portion 5 of the rivet body 2.
• the breakable zone 24 is arranged so that after assembly of the elements P, P ', the breakage of the rod 18 at the breakable zone 24 does not leave the portion of the rod 18 remaining in the body 2 of the rivet extend beyond the rivet body 2, and that the remaining stem portion 18 in the rivet body 2 'comes flush with the flange 3.
• the rivet 1, the may be rolled sheet and welded, or stamped sheet.
• the piercing element 4 can also be made of rolled sheet with dovetail clipping, welding or crimping, or stamped sheet metal.
• the rivet 1 can also be made completely by plastic molding or injection of plastic material to be manufactured at low cost and used to assemble two automotive floor mats, or a floor mat to a plate for example.
• the rivet 1 could also be used for fixing cable passages, used to position heavy or light fastening systems, or for the internal fixation for cars with metal or composite box.
• Rivet 1 could also be manufactured by adding material to a 3D printer if, for example, it was a small series production.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Insertion Pins And Rivets (AREA)
• Connection Of Plates (AREA)
• Drilling Tools (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=54783908

Family Applications (1)

Country Status (8)

Families Citing this family (3)

Family Cites Families (8)

• 2015
  • 2015-10-27 FR FR1560258A patent/FR3042830B1/fr active Active
• 2016
  • 2016-10-25 CN CN201621165938.XU patent/CN206449082U/zh not_active Withdrawn - After Issue
  • 2016-10-25 KR KR1020187011859A patent/KR20180071273A/ko not_active Application Discontinuation
  • 2016-10-25 US US15/771,866 patent/US20180306227A1/en not_active Abandoned
  • 2016-10-25 WO PCT/FR2016/052770 patent/WO2017072439A1/fr active Application Filing
  • 2016-10-25 CN CN201610942351.3A patent/CN106979209B/zh not_active Expired - Fee Related
  • 2016-10-25 EP EP16809931.5A patent/EP3368778A1/de not_active Withdrawn
  • 2016-10-25 BR BR112018008485A patent/BR112018008485A2/pt not_active Application Discontinuation
  • 2016-10-25 JP JP2018520173A patent/JP2018537625A/ja active Pending

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