FR2567217A1 - PERFORATING NUT, ITS ASSEMBLY WITH A PANEL AND CORRESPONDING METHOD - Google Patents

Abstract

A POLYGONAL PERFORATING NUT 20 WHICH CAN BE AUTOMATICALLY MOUNTED AND PREFERABLY FLOODED ON A SHEET BY MEANS OF A PERFORATION HEAD INCLUDES A GROOVE 36, WHICH SURROUND A PERFORATED PART 26 SELF-PERFORATING AND HAS AN INCATERAL SIDE WALL SHAPED ON THE OUTSIDE PARTS AT THE CORNERS OF THE NUT AND OF THE PASSAGE RECESSES LOCATED BETWEEN THESE PARTS 32 WHILE THE DIE WHICH IS PART OF THE PERFORATION HEAD INCLUDES A RIVETING LIP 64 WHICH DEFORMS THE CORRESPONDING PARTS OF THE SHEET 90 IN THE GROOVING IN A CONTINUOUS OPERATION IN TWO STAGES, THE PERFORATION HEAD ALSO INCLUDING A PLUNGER HEAD WITH A 70 NUT PASSAGE, THE SECTION OF WHICH HAS A SHAPE CORRESPONDING TO THAT OF THE POLYGONAL NUT, SO THAT, DURING THE ASSEMBLY, THE NUT TAKES SUPPORT TO THE LEVEL OF ITS CORNERS IN THE NUT PASSAGE 70.

Description

_-1 _

  The invention relates to self-drilling nuts for

  before being drowned, which can be automatically attached to

  a panel in a matrix fixture, the pro-

  yielded fixing a self-piercing nut and the nut and panel assembly thus obtained. The perforating nuts have given excellent results in the industry, in particular in the automotive industry, where the perforating nuts are placed by a matrix fixing device which is generally placed in a large matrix press like those which the are used for forming metal panels o Perforating nuts

  are brought in bulk or in continuous series and a perfo-

  rant is placed in the panel at each stroke of the die press, under the conditions indicated by the

US patents 3,108,368 and 3,969,808.

  The rivet piercing nuts used in the

  industry are generally made from a profile

  laminated metal which can either have a T shape,

  the patent US 3,152,628 indicates to me, that is to say including

  flanges on opposite sides of the guide grooves in re-

  line, so as to produce a submerged assembly, under the conditions indicated by US Patents 3,469,613 and 3,468,747 0n also found, in the state of the prior art,

  different embodiments of piercing nuts of ri-

  die-stamped or cold-rimmed head bolts, such as those described in US Patents 3,282,515, 3,736,969, 3,878,599 and 4,389,766, but the rivet head piercing nuts with

  have not given satisfactory results in the

  automotive industry because of the cost of forming perforating nuts of this type and the problems posed by their installation. It should be noted that the nuts

  perforators formed by riveting the cold head comprising

  generally have a central guide part comprising

  both a perforating face, a circular groove

  rant the guide part and a flange surrounding the groove - 2 - The panel part which is contiguous! at the edge of the panel

  perforated is deformed so as to penetrate the groove

  re and to make a mechanical socket. The devices

  of this type are generally sensitive to pressure,

  that is, excessive pushing of the matrix device

  may cause deformation of the nut, especially

  of, while in case of insufficient push it is bad

  serréo Different solutions have been proposed to solve

  dre these problems including the use of grooves of complex shape as in the devices described in US Patents 3 878 599 and 4 389 766 and in which the flange is deliberately deformed. These attempts to resolve the problems associated with the use of cold-tipped piercing nuts have not, until

  present, satisfactory results in the industry.

  More recently, it has been proposed to use a simplified square perforating nut comprising a guide part.

  shaped like a trunk of c8ne and triangular flanges if-

  killed at the four corners of the nut and separated by ca-

  nales coinciding with the bottom of the groove which surrounds the guide part. The perforating nut is put in place by a matrix comprising a head comprising a reciprocating plunger which pushes the nut, through a head beak, into the panel to pierce it and a matrix base , located on the opposite side, deforms the panel by making it penetrate into the grooves of the nut so as to

  fix the nut on the panel. This nut is also sens-

  susceptible to press action. If the thrust is excessive, the flanges, which are not supported, are deformed towards

  outside and jam the nut in the head. If the push

  is insufficient, the panel is not deformed above

  under the guide part in the form of a trunk of c8ne,

  so that the clamping is not enough for applica-

industrial relations.

  The perforating nut, the assembly carried out with the pan-

  -3- skin and the process which are the subject of the suppressed invention,

  As we will see, the problems posed by

  perforating dies, dies or cold riveted heads which come

  nent to be describedo The perforating nut preferably used in the process which is the subject of the invention for the production of a nut and panel assembly can be cold-rimmed or stamped head and is relatively simple which makes

  making it less costly than that of perfo-

  cold head rants described in US patents

  jà citéso This perforating nut is preferably polygonal

  and has four or more sides o In the re-

  preferred embodiment of the invention, this perforating nut comprises

  takes a central guide part having a flat annular perforation surface surrounding a bore of nut connections which crosses the guide part perpendicularly

  to the perforation surface. A groove in the nut which

  the guide part has inner and outer walls and a bottom wall and the nut has flanges on the opposite sides of the guide piece, at least at the corners of the polygonal nut. The flanges have a support surface of the panel which is in links

  seems perpendicular and preferably at some distance

  tance below the plane of the perforation face of the guide part to obtain an assembly of nut and embedded panel The inner wall of the flanges contiguous to the guide part forming the outer side wall of the groove is inclined from from the bottom of the groove towards the guide part so as to delimit

  a recessed groove having a reduced opening.

  In the preferred embodiment of the perforating nut, the groove comprises recesses oriented in the direction

  radial and located at a certain distance from the corners of the

  polygonal nut whose bottom coincides with the bottom of the groove and which is inserted between the flanges located at the -4 corners of the nut. In the preferred embodiment, the

  outer wall of the nut groove includes parts

  recessed ties in the flanges.

  As we have seen, the perforating nut according to the invention can be automatically placed in a panel in a matrix fixing device which comprises a spout comprising a plunger acting in both directions and, from the

  opposite side a matrix base. The matrix base

  usually has a flat end face, a bore

  central and a projecting annular lip surrounding the

  wise generally having the same shape as the groove of the nut and being able to penetrate into the groove of the nut

  so that the panel is deformed when entering the

  nure, as we will see later. The beak has g6-

  usually a flat end face surrounding a polygonal bore passing through the end face which has an inner surface having a shape which allows the nut

  polygonal to engage in it exactly. The end face

  the spout has several recesses located at a certain

  distance from the corners of the nut when it is placed in the bore 0 As we have seen, a diver engages

  telescopically in the spout so that it can be moved there

  place and install the piercing nut in the panel

  under the conditions indicated below.

  The method preferably used for fixing the perforating nut to a panel consists first of all in placing the panel in contact with the end face of the matrix base so that it is parallel to it in the assembly, then placing the nut in the bore of the beak-shaped part so that the perforation face of the guide part is turned towards the panel and the plunger located against the nut has the same axis as the bore of the matrix base 0 As we have seen, the perforating nuts can

  be brought to the spout bore either in bulk or successively

  The piercing nuts can be connected by - 5 -

  provisional linkage devices under the specified conditions

  quées by US patent 3 845 86Qo The perforating nut located in the bore of the spout of the side

  opposite the matrix base is then put in place by

  placement of the plunger in relation to the spout and the base

  to push the nut so that it punctures the pan

  neau and that it is placed on the panel in a single movement

  continuo As we have seen, the matrix fastening device

  this is generally mounted in a large die press and a perforating nut is placed in the panel at each stroke of the press, The guide part of the nut extracted by drilling a small cylinder from the panel, which gives an edge of pan = perforated ring, and the small cylinder detached from the panel is introduced into the bore of the matrix base and ejected from the matrix fixing deviceo Then the lip of the matrix base deforms the part of the panel adjacent to the edge of the perforated panel. so as to make it penetrate into the groove of the nut around the inclined outer groove wall by trapping the panel part in question in the groove of the nut below the lip of the matrix base. The lip of the matrix base then deforms the part of the panel against the bottom of the

  groove by thinning the panel and distorting the

  panel tie below the outer wall of groove

  re inclined and, preferably, against the inner wall of the groove and the guide part, thus blocking the panel part in the groove of the nut so that most of the panel is supported on the one or more

  flange surfaces supporting the panel.

  As we have seen, the polygonal nut engages exactly

  in the polygonal bore of the spout at the corners of the

  nut and flanges are pushed elastically against the

  polygonal damage to the beak when the panel part is deformed in contact with the bottom of the groove of the nut, this -6-

  which prevents deformation of the flanges or the jamming of the

  nut in the bore of the spout. The recesses in the

  spout end surface can also receive frag-

  Nut formed when the press is put back into action when a nut is already in place in the panel, which can happen inadvertently or when the press starts. In this double thrust situation, the flanges "explode" in the radial direction outwards and damage or jam the head. In the preferred embodiment of the

  spout and of the process according to the invention, the spout supports soli-

  the flanges of the nut during its installation and the

  nut fragments are easily guided to the outside

  of the head through the recesses in the spout.

  As we have seen, the preferred embodiment of the

  nut has recesses extending in the radial direction through the flanges and the reLtot parts formed in the outer groove walls extending into the flanges. In the method of fitting the perforating nut corresponding to the preferred embodiment, the major part of the panel bears on the surfaces of the flanges supporting the panel and is deformed so as to penetrate into the recesses of the nuts so as to prevent any

  rotation. The raised parts, which can be

  semi-circular concave shapes formed in the outer walls

  grooves, cooperate with the bore of the spout for

  catch the deformation of the flanges. The deformed panel part

  méée in the bottom of the nut groove is deformed in mani

  era to penetrate parts with parts in re-

  btait, in particular in the event of excessive thrust, which avoids the

  deformation of the nut flanges.

  The assembly of the nut and the panel and the following process

  The invention is therefore less sensitive to the conditions of access.

  tion of the press. The two-stage process which consists in deforming the panel to make it penetrate the groove of

  the nut provides the warranty that the panel part is of-

  - 7 - edge trapped in the groove by deformation of the panel around the outer wall of the groove below the lip of the matrix base As we have seen, the part of pan = neau trapped is then deformed and tapered to the contact of the bottom of the groove so as to engage against the outer wall of the groove, against practically all of the bottom of the groove and the edge of the perforated panel is preferably deformed so as to engage against the inner side wall or the guiding part o The side wall exs

  the inclined interior of the groove is particularly important

  aunt in the positioning process according to leinventiono When the push is insufficient, when the panel part cannot be deformed enough so that the edge of the perforated panel engages securely in the guide part, the holding forces are sufficient for industrial applications, because the panel part is deformed below the inclined outer wall of the groove during the initial deformation of the panel part. In addition, when the thrust is excessive:

  the flanges do not deform9 because these flanges are main-

  held and protected against deformation by the shape of the spout bore and the panel is deformed so

  to penetrate into the re-rait parts made in the pa-

  outer king of the groove The nut, the assembly on the panel and the soot process vant.l'.invention therefore have significant advantages over the state of the prior art. The punched or cold riveted head perforating nut is less expensive to manufacture than the complicated shaped grooves used

  in the state of the prior art0 In addition, the process

  vant the invention ensures sufficient maintenance of the parts for industrial applications when the thrust is

  insufficient and avoids jamming and damage during

  that the thrust is excessive. Other ramtages and other interesting features of the invention are set out.

  videneez by the following description and by the claims-

  -8-% ions. The invention is described below in more detail by means of preferred embodiments, with reference to

referring to the drawing.

  Figure 1 is a perspective view from above of a

  embodiment of a nut according to the invention.

  FIG. 2 is a view from above of the nut shown

  felt by Figure 1.o Figure 3 is a sectional view in the lateral direction, in the direction of the arrows 3-3, of the perforating nut shown

by figure 2.

  Figure 4 is a perspective view from above of a second embodiment of the following piercing nut

1 invention.

  Figure 5 is a top view of the perfo-

rant represented by figure 4.

  Figure 6 is a cross section in the direction of arrows 6-6 of the piercing nut shown in Figure 5. Figure 7 is a perspective view from above of a

  matrix base allowing the fitting of the per-nut

  drilling shown in Figures 1 to 3.

  Figure 8 is a view from below of the nut

  drilling represented by FIGS. 1 to 3, in a device

  matrix fixing ready to operate.

  FIG. 9 is a section, seen in the lateral direction, in the direction of the arrows 9-9, of the fixing device and of the perforating nut represented by FIG. 8 and of the

  panel and matrix base shown in Figure 7.

  Figure 10 is a partial cross section, in

  the direction of the arrows 9 and 10, similar to that of the fi-

gure 9.

  Figure 11 is a perspective view from above, of a matrix base allowing the establishment of the nut

  perforator represented by figures-4 to 6.

- 9-

  Figure 12 is a bottom view of the nut

  drilling shown in Figures 4 to 6 in a device

  matrix fixing ready to operate.

  FIG. 13 is a sectional view in the lateral direction in the direction of the arrows 13-13, of the matrix fastening device and of the perforating nut shown in FIG. 12

  and a panel and matrix base represented by the fi-

gure 11.

  Figure 14 is a view from below of the nut and panel assembly shown in Figures 9 and 100 Figure 15 is a view from below of the nut and panel assembly shown in Figure 13o

  Figures 1 to 3 show a pre-

  féré of the nut.perforant according to the invention. The perfo- nut

  rant described 20 is polygonal and has four side walls

  rails 22 connected by cut-off corners 24 The nut

  drilling includes in its center a guide portion 26

  bearing a flat annular surface 28 surrounding a threaded bore 30. In the embodiment described9 flanges 32 located at the corners of the nut each have a surface 34, for the support of the panel, parallel to the plane of the

  perforation surface28 of the guide portion 26, but if

  killed some distance below this plane, as the

Figure 3.

  A groove 36 surrounds the guide portion which comprises an inner cylindrical side wall 38 which constitutes the outer wall of the guide portion, a bottom 40 and an inclined outer side wall 42 which is formed by the inner side wall of the flanges adjacent to the guide portion 26. In the preferred embodiment of

  the perforating nut represented by FIGS. 1 to 3, the parts

  outer lateral kings 42 of the groove have

  recessed portions 44 having the form of concave grooves se-

  semicircular located in front of the guide portion 26 at

  level of the corners of the nut. In this embodiment,

- 10 -

  féré, the perforating nut also comprises recesses 46 allowing the passage between the flanges 32 which they separate and a bottom which merges with the bottom 40 of the groove. There is

  place to notice that the side walls 48 of these hollow

  passage elements are inclined so as to improve the retention of the nut on the panel under conditions which

  will be explained later. Finally, the end of the é-

  nut located on the side opposite the guide part is cutaway, as indicated by reference 50, so as to lighten

the perforating nut.

  In the variant constituted by the embodiment

  represented by FIGS. 4 to 6, the "perforating nut 120

  carries six walls 122 connected by corners 124. The guide portion 126 has an annular perforation surface 128 surrounding a threaded bore 130. The nut described in this embodiment has six flanges 132 located at different angles of the hexagonal nut 120 and each flange has a surface 134 for supporting the panel parallel to the plane of the perforation surface 128, but at a certain distance from it, as shown in FIG. 6o

  The perforating nut 120 comprises a groove 136 which

  turns the guide portion 126 which has a side wall

  inner lane 138 formed by the outer wall of the guide portion 126, a bottom 140 and an inclined outer wall 142 formed by the inner side walls

  flanges 132 adjacent to the guide part. In the mo-

  of preferred embodiment shown in FIGS. 4 to 6, the nut comprises several passage recesses 146 located at equal distances from the corners 124 and each comprising a bottom which merges with the bottom 140 of the nut groove 136. The passages 146 pass through the flanges 132 and have side walls 148 perpendicular to the bottom of the groove. The lower part of the nut located on the

  side opposite to the guide portion 126 may be in cross-section

  pe, as indicated by reference 150, to lighten the nut.

2567Z17

- 11 -

  As we have seen, the perforating nut according to the invention is preferably polygonal, but the number of sides which it

  must have depends on the intended use o When the bri-

  some are quite far from each other9 the walls

  the outer sides of the groove preferably comprise 9, recessed portions as indicated by the reference 44 in FIGS. 1 to 3. The bore of the nut can be threaded, as in the case indicated, or non-threaded when it must be used with a self-perforating screw or bolt In the embodiments described, the inner side wall of the groove is preferably cylindrical and perpendicular to the bottom of the groove as indicated by the reference 38 of the

  Figures 1 to 3 and the reference 138 of Figures 4 to 6, ma-

  in order to avoid any deformation of the guide part and any distortion of the thread during the fitting of the perforating nut. However, it is possible in certain applications to use an inner wall inclined so that the two walls of the groove converge. The nut

  perforating is preferably made from a metal

  me steel, which is not subject to distortion during the

  fitting the nut, It is however possible to use

  read as a perforating nut according to the invention a perforation and riveting nut in which the guide part is deformed during the positioning9 so as to ensure

  better retention of the nut on the panel.

  A matrix fixing device allowing, under good conditions, the positioning according to the invention of

  the perforating nut represented by FIGS. 1 to. 3is shown

  felt by FIGS. 7 to 100 As we have seen, the matrix fixing device comprises, as indicated in FIG. 10,

  a matrix base 54, a spout 56 and a plunger 58 o The cu-

  matrix batch has an essential end surface-

  flat 60, a central bore 62 and a rivet lip

  annular ge 64 projecting from the surface of ex-

  end 60. As shown in FIG. 7, the riveting lip -12-

  64 has a shape which allows it to engage telescopically.

  in the groove 36 formed in the perforating nut. In these

  conditions, the inner surface 62 is cylindrical so that

  era to exactly surround the cylindrical surface 38 of the par-

  guide tie and the outer wall 66 is essentially square and has cut-off corners 68. In addition, the outer wall 66 of the riveting lip is inclined towards

  the exterior from the upper surface so as to

  to avoid a break with the panel, to improve the maintenance and to avoid blocking of the riveting lip in the groove of the nut,

  The spout 56 includes a square central bore or a pass

  nut age 70 in which exactly engage, as the in-

  say Figures 8 and 10, the side walls 22 of the

  perforating nut. Several recesses 72 are formed in the flat end surface 74 of the spout. These recesses 72 are oriented along the axes of the spout which are perpendicular to the bore or rectangular recess 70 and located, as

  indicated in figure 8, at the same distance from the corners of the step-

  nut wise. In addition, the width of the passage recesses 72 is greater than the maximum dimension of the flanges 32 of

  the perforating nut, so that it can receive frag-

  flange elements in the event of a return to the device circuit

  matrix fixing. The plunger 58 can be square and

  telescopically pledged, under the conditions indicated below-

  in the recess 70 formed in the spout.

  As we have seen, the fixing device used for the positioning of the perforating nut according to the invention is normally mounted in a large matrix part. In this device, the die base 54 is fixed to one of the press plates and the spout 56 and the plunger 58 are fixed to the opposite plate of the die press. The die press can be used to give the panel a specific shape at the same time, several perforating nuts

  being set up for each stroke of the die-forging press.

- 13 -

  The stamping press produces a pressure of several ton-

  nes so that it is difficult to precisely adjust the fitting pressure of the nut supplied by the positive die for matrix fixing. The spout 56 is only shown in part because the mounting or positioning head D which includes the spout 56 and the plunger 585 can be "for the rest, of a conventional type. The mounting or mounting head

  set up normally includes a feeding mechanism

  tion which brings perforating nuts in a passage to é-

  GO crous 70 below the plunger 58, and an articulated assembly like that described by the US patents already cited

  After this description of the embodiments

  of piercing nuts according to the invention, it is possible to describe the method used for placing a piercing nut on a panel. It is understood that the elements of the matrix fixing device can be

  fixed either to the die shoe or to the press plate

  In the fixing process described9 the base

  matrix 54 is shown attached to the matrix shoe

* lower. However, it is obvious that this provision

  elements constituting the fixing device to ma-

  trice can be reversed for a piercing upwards The terms used in eoas, like haut9 bas, fond etc

  are therefore only relative. The matrix base 54 is es-

  substantially cylindrical and includes a groove

  screwing allowing to place with precision the base of ma-

  with respect to the spout and the perforating nut ready for

  be mounted. The matrix base also includes a surai

  lesion 78 arranged so as to have the same axis as a-

  lesion 62 and to be able to communicate with it in order to be able to extract the small cylinder from the panel without snagging

  As shown in Figures 8 to 10, the following procedure

  The invention firstly consists in placing the panel P above the flat end surface of the base

  so that it is, overall, parallel to

- 14 -2567217

  this surface and so that the riveting lip 64 is

  at the groove 36 of the perforating nut 20 comas l-r.

  say Figures 9 and 10. The perforating nut 20 is then placed in the bore or in the passage recess 70 of the spout below the plunger 58 as shown in Figure 10. The plunger is not shown in Figure 9, so as to highlight the position of the passage recesses 72

  formed in the end of the beak, the length thereof

  of the thickness of the nut 20. As indicated by the

  US patents already cited, the perforating nuts pass normal-

  LEMENT in a transverse recess formed in the mounting head or placement, which is not shown, are brought to the passage recess 70 formed in the spout

  by a feed ratchet and places and supported at the inter-

  section of the recesses below the plunger 58. The press

  to be stamped is then closed and pushes the end surface

  flat half 76 of the spout against the panel P and the plunger

  drop inside the passage recess 70 formed in the spout by pushing the nut 20 against the panel P and

  perforating panel P as shown in figure 9. The panel

  neau P is perforated between the upper inner edge of the lip 80 of the matrix base and the inner edge 82 of the guide part so as to obtain a: small cylinder of panel S having practically the same shape as the guide part of the 'nut. In the embodiment described, the small cylinder of panel S is circular unless the

  guide part is simultaneously riveted and the small cy-

  lindre S engages in bore 62 of the matrix base and

  is ejected while crossing overbore 78.

  As we have seen, the panel part adjacent to the edge of the perforated panel is then deformed by penetrating into the grooves of the nut during a continuous deformation in

  two stages. The panel part is first deformed

  tower of the outer inclined side wall 42 of the rail

  nure 36 of the nut below the lip 64 of the base of ma-

- 15 - 2S6217

  1-5 trice by trapping the panel part in the groove for a final installation 0 The continuous displacement of the perforating nut 20 under the plunger 56 has the effect of

  continue to move lip 64 of the matrix matrix base

  so that it penetrates into the groove of the nut and the panel part is then deformed and thinned in contact with the bottom of the groove, the panel part deforming in

  the radial direction outwards below the wall ex-

  inclined inner side of the groove, so as to engage so-

  l0 firmly against the outer wall of the groove and

  wager radially inward against the wall

  inner 38 of the groove and to achieve a meticulous interlocking

  canique between the panel part and the groove of the nut

without cracking the panel.

  It can therefore be seen that, the panel P. after the positioning comprises a main part of the panel 84 supported on the bearing surfaces 32 of the nut flanges, a second part of the panel 86 which starts from the main part of the panel for penetrate into the grooves of the nut in contact with and below the external inclined lateral parts 42 and a third panel part 88 which is deformed and

  thinned in contact with the bottom of the groove and is essential

  Lely engaged in contact with the entire bottom of the groove

  be the outer wall and preferably against the inner wall 38 of the groove. Mechanical nesting includes

  therefore an intermediate part 86 and an end part, 88.

  which hold the panel securely on the ground

  nure. In addition, as shown in FIG. 14, the parts 90 of the part of the main pannom are deformed in the passage recesses formed in the nut and constitute devices which pocket the rotation and the distortion of the

  flanges of the nut, under conditions indicated later

rement.

  During the final fitting of the nut on the pan-

  neau, during which the panel part is deformed and thinned, in contact with the bottom of the groove, the corner 24 is completely supported in the passage recess 70, as shown in FIGS. 8 and 10. The flanges 32 are pushed elastically against the passage recess 70 without deformation of the flanges when the panel is deformed in the bottom of the nut groove. The panel can also

  be deformed by entering the recessed part 44 m

  swam in the outer side wall 42 of the groove

  nut, which reduces the pressure on the flanges. The-

  formation of nut flanges reduces the holding force of the nut on the panel and can cause the nut to catch on the spout. The process according to the invention is therefore less sensitive to the action of the matrix. When the thrust is excessive, when the lip 64 of the base of

  die goes too far into the nut grooves, the

  sion is attenuated in nut recesses 46 and com-

  me we saw it, the recessed parts 44 and the flanges

  nuts are not deformed o When the thrust is in-

  sufficient, when the die cap lip does not go far enough into the nut grooves to deform the panel portion against the bottom of the groove for the complete engagement of the inner wall of the groove, the placement is insufficient for industrial applications because the panel is deformed below the

  inclined outer wall of the groove during deformation

  initial mation of the panel part and against the bottom of the groove so as to deform the panel against the

  inclined outer wall of the groove. It is a parti-

  significant regularity of the perforating nut, of the assembly on the panel and of the process according to the invention. In addition, the recesses 72 formed at the end of the spout are capable of receiving nut fragments under the conditions of

  double push when the press is reactivated a-

  when a nut has already been placed in the panel.

  When the press is put back into action, the flanges are

- 17 -

  sheared from the nut already in place in the pan

  neau and the rest of the nut, including the guide part, is pushed into the panel, The second nut is then put in place of the first nut The parts of sheared flanges are then received in the recesses of passage 72 provided

  into the spout and sent outside the fixing device

  matrix die without any damage to the beak. The following process

  The invention combines the advantages resulting from the fact that

  the nut is fully pressed, that the parts forming bri-

  do not deform, it avoids any damage to the beak because it can adapt to a double push

  Figures 11 to 13 show a second mode of re-

  Alization of the matrix fixing device which can be

  used to install a perforating nut 120 shown

  shown in FIGS. 4 to 5. The matrix fixing device comprises a matrix base 154, a spout 156 and a plunger

  158 can move in both directions. The matrix pellet

  this 154 includes a flat end surface 160, a central bore 162 and a riveting lip 164 which surrounds the bore 162. In the embodiment described, the riveting lip

  164 has an essentially circular shape so that

  see engage in the circular groove 136 of the nut and preferably has an inclined outer wall 166 which prevents any cracking and tearing of the panel and

  any hooking of the riveting lip in the nut groove.

  The spout 156 includes a hexagonal bore or a nut passage recess 170 in which the

  external side walls 122 of the hexagonal perforating nut

  gonal120 and on which the perforating nut is completely supported at the corners 124, as indicated in FIGS. 12 and 13. As we have seen, the spout preferably also comprises several passages 172 which cross the surface of flat end 174 of the spout which receives the nut fragments when the press is reactivated while a nut is already in place in the panel. The matrix base described 154 a - 18-

  essentially cylindrical in shape and has a rai-

  keyway 176, allowing precise positioning

  of the matrix base and a recess 178 receiving and evacuating

  ant the small cylinder cut in the panel.

  The method of placing the perforating nut 120 on the panel P is essentially the same as that which has already been described. The panel P is placed on the matrix base 154 so as to be essentially parallel to the flat end surface 160o. A perforating nut 120 is then placed in the nut passage 170 of the spout 156 so that the perforating surface 128 of the guide portion 126 is turned towards the panel. Beak 156

  and the plunger 158 are then moved relative to the cu-

  batch of matrix 154 under the conditions already indicated. The plunger 158 then pushes the perforating nut so that the perforating nut 120 enters the panel P.

  panel is then perforated between the edge of.

  t 180 of the lip 164 of the matrix base and the edge

  outside 182 of the guide portion 126 of the nut. the pe-

  tit cylinder S from the panel then goes into the

  central sage 162 of the matrix base and this small cylinder

  S coming from the panel is ejected by recess 178.

  The panel portion adjacent to the panel edge per-

  drilled is then deformed so as to enter the groove 136 of the perforating nut 136 in a continuous deformation in two stages. First, the panel portion is deformed around the outer side wall 142 of the groove so as to penetrate the groove below

  of the riveting lip 164 so that the metal

  tituant the panel is trapped in the groove. Then, the panel part is deformed and thinned in contact with the bottom of the groove by the riveting lip 164 so that the panel part deforms outwards in the radial direction in contact with the inclined outer wall 142 and towards the inside in the radial direction in contact with the inclined inner side wall 138 of the groove

  so as to achieve a mechanical interlocking between the

25672 1 7

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  panel tie and the groove of the nut under the conditions already indicated As shown in particular in Figure 13

  inclined outer surface 166 of the lip of the base of the

  trice directs the panel outwards in a direction

  dial so as to securely fix the panel below

  the inclined outer wall of the groove.

  As we have seen, the resulting nut and panel assembly comprises a panel part 184 which bears on the bearing surfaces 134 of the flange panel 132, a second panel part or intermediate part 186 which goes from the main part of the panel to the

  nut groove 136 and a third panel part or par-

  end tie 188 which is deformed so as to engage

  against the entire bottom 140 of the groove, below the pa-

  inclined outer king 142 of the groove and preferably against the inner wall 158 of the groove. Furthermore, as

  indicated in figure 15, the main part of the panel

  takes parts 190 which are deformed so as to penetrate = shaft in the recesses 146 formed in the axial direction in the perforating nut and passing between the flanges 132o On

  In FIG. 13, the plunger 158 is partially set back for my

  trer the location and function of the recesses 172 in the

  spout 1-56 As we have seen, the passage recesses 172 receive

  wind the flange fragments in case the press is put back into action when a perforating nut is already put in place in the panelo Furthermore the installation process is the same as that which has been described for the installation of the perforating nut in the case of Figures 1 to 3o

  It goes without saying that modifications can be made

  tees with perforating nuts to the assemblies on the panel and to the process which are the subject of the invention without leaving

  of the scope of the claims. So, for example,

  for some applications, the flanges can be contil bare around the guide part and have recessed parts at the corners. In addition, the perforating nut,

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  which is preferably cold riveted or stamped head, can.

  have any number of sides, the corners preferably taking support in lebec in the conrditions indicated. he

  however, it is possible to make the corners

  aletrnatively support in the spout when the perforating nut has a large number of cetsa and that parts in

  recesses are provided in the outer groove to avoid

  ter the deformation of the flanges during assembly. The description

  tion which; was made of preferred embodiments of the perforating nut, of the assembly with the panel and of the process according to the invention, fits into the general framework of

  the invention defined by the claims.

2 5 6 7 217

Claims (12)

  1. Perforating nut comprising a perforated part, a   groove surrounding at least partially the per-   drilled and at least one zone or annex part forming a flange or shoulder at least partially surrounding the groove, characterized in that it has a polygonal contour and comprises a central perforated part (26 "126) comprising an annular perforation surface ( 289 128), a bore (30, 130) passing through the perforated part (26,126) being essentially perpendicular to the perforation surface (28,128) and preferably provided with a thread, a groove (3.6,136) surrounding the part perforated (26,126) and having interior and exterior side walls (38,138 or 429142)   and a bottom (40,140), annex parts forming bri-   or shoulders located at the corners of the 1st polygonal perforating nut (20,120) at the level of the blocks   opposite of the perforated part (26,126) 2 chain of the   additional parts (32,132) forming a shoulder comprising a bearing surface (34,134) parallel to the plane of the perforation surface (28,128) and situated at a certain distance below it, the walls of the parts anne   xes (32,132) facing the perforated part   killing the outer wall (42,142) of the groove (36,136) inclined from the bottom (40,140) of the groove towards the perforated part (26,126), so that the opening of the groove is narrower than its bottom . 2. A perforating nut according to claim 1, characterized in that it comprises recesses (46,146) passing preferably passing in the radial direction between the annexed parts (32) at a certain distance from the corners of the nut and separating the annexed parts of each other.   3. Perforating nut according to one of claims 1 or 2,   2 - characterized in that the inner side wall (38, 138) is cylindrical and essentially perpendicular basically.   4. Perforating nut according to one of claims I to 3,   characterized in that the outer side wall (41, 142) has concave recessed portions (44, 144), preferably semi-circular which are located in the adjoining portions forming shoulders (32, 132) at the level   corners of the polygonal perforating nut.   5. Perforating nut according to one of claims 1 to 4,   characterized in that the bottom of the passage recesses   (46, 146) coincides with the bottom (40, 140) of the spoke nure (36, 136) or connects to it.   6. Perforating nut according to one of claims 1 to 5,   characterized in that the recessed parts (44, 144) formed in the annexed parts (32, 132) forming shoulders located at the corners are open towards the perforated part (26, 126).   7D perforating nut according to one of claims 1 to 6,   characterized in that the outer surfaces constitute   killing the outer periphery of the nut are flat and are connected to the corner areas and in that the wall of the perforated part facing the corner areas or the ancillary parts forming shoulders (32, 132) constitutes the inner lethal wall ( 38, 138) of the groove, essentially perpendicular to the bottom (40,) of the groove 8. Perforating head for mounting on a panel or on a similar part of a female element according to one of the   Claims 1 to 7, characterized in that it comprises   a die having a substantially planar end surface (60, 160), a central bore (62, 162) and a protruding rivet lip (64, 164) which surrounds the bore (62, 162) and follows essentially the same around the groove (36, 136) and can engage   in the groove, a plunger head (56, 156) comprising   as an essentially planar end surface (74, 174), a polygonal bore (709 170) passing through the end surface, the interior surface of the aldsa-   ge having a shape such that it can adapt narrow-   ment to the female element, and several passage recesses (729 172) made in the end surface (74, 174). o a certain distance from the corners of the nut,   when these are held in the bore or thread   wise (70, 170) of the nut, and a pusher (58, 958) for   before telescopically carrying out movements of   back and forth in the plunger head (56, 156) o   9. Method of mounting a nut according to one of the claims   positions 9 to 7. preferably using a perfo-   rante according to claim 8, characterized in that o a) a sheet (P) is placed close to the surface   end (60, 160) of the matrix (54, 154) and paral-   parallel to it, the nut (20, 120) being placed in the plunger head (56, 156) in such a way that its perforated barrier (26, 126) is directed towards the rod (P) and, from the rear side of the nut, the punch (589 158)   being placed so as to have the same axis as the sage (62, 162) of the matrix.   b) the punch (58, 158) is placed relative to the plunger head (56, 156) until it comes into contact with the perforating nut (20, 120) and pushes the nut up to that it is applied against the sheet and then fixes it   to the sheet in a continuous movement.   c) the perforated part (26, 126) detaches a small cylinder   dre (S) by perforation of the tSle (P) and, thereby9 forms an edge of perforated sheet and the small cylinder (S) is transported in the bore (62, 162) of the matrix d) the riveting lip (64, 164) deforms a part of the rod near the edge of the perforated sheet by making it penetrate the groove (36, 136) of the nut around the inclined outer wall (42, 142) of the groove and imprison this part of t8le in   the groove of the nut under the riveting lip.   e) the riveting lip (64, 164) then deforms this-   te part of tale against the bottom (40, 140) of the rai-   stiffens and, in so doing, thins this part of the sheet and pushes it under the inclined outer side wall (42, 142) and, as a result, engages this part of the sheet as a corner in the groove of the nut and applies   the part of the tale contiguous to the deformed part   be the bearing surface (s) (34, 134) of the parts   annexes forming shoulders (32, t32).   f) the external blocks of the annexed parts (32, 132) forming shoulders are prestressed or pushed by a   elastic against the inner surface of the a-   damage or nut passage (70, 170) formed in the   plunger head (56, 156) at the corners of the   polygonal nut while the part of t8le in question   tion is deformed against the bottom (40, 140) of the rai-   10. Method according to claim 9, characterized in that part of the deformed t8le is deformed in   the passage recess (46, 146) of the nut.   11. Method according to one of claims-9 or 10, charac-   terized in that part of the deformed t8le penetrates   be in the recessed parts (44, 144) of the external lateral wall (42, 142) of the groove (36, 136) and also deforms therein under the action of the internal surface of the nut passage (70, 170) of the plunger head (56, 156), which prevents deformation of the   additional parts (32, 132) forming shoulders.   12. Method according to one of claims 9 to 11, charac-   terized in that part of the deformed t8le is deformed around the inner side wall (38, $ 5- 138) of the groove (36, 136) by pressing against this inner side wall (38, 138) while another part of the deformed sheet part is deformed under the inclined outer side wall (42, 142) of the groove by pressing against it until at least near the bottom of the groove and, preferably, also applies against the wall lateral interior (38, 138).   13. Method according to one of claims 9 to 129 camisole   characterized in that the nut is fixed to the sheet so as to be at or in line with it,   the parts of the sheet that apply to the surfaces   these support (34, 134) being deformed in the recesses-   passage elements (46, 146) of the nut.   14. Assembly of nut and sheet preferably made of   using a perforation head according to the claim   tion 8 and a nut according to one of claims 1 to   7, characterized in that a part (main part (84, 184) of the sheet is applied against the surfaces   support (34, 134) of the annexed parts (32, 132) for-   mant shoulders and is arranged parallel to the over-   of perforation (28, 128) of the perforating nut (20, 120), essentially in its alignment or at the same level as it, the parts of this main part of the sheet being deformed in the passage recesses (46, 146 ), in that a second part (86, 186) of   the sheet is deformed around the inner side walls   of the annexed parts (32, 132) forming flanges   facing the perforated part (26, 126) in application   as against the outer side wall (42, 142) of the groove (36, 136) and in that a third part of the sheet, located near the edge of the perforated sheet, is deformed, tapering against the bottom (40, 140)   groove, so that it is applied   be the entire bottom of the groove even below 6- the inclined outer side wall (42, 142) of the groove (38, 138) and in that, preferably, the   perforated edge of the sheet is in contact with the wall la-   inner lining (38, 138) of the groove, so that the second part and the third part of the body   the (86,186-or 88, 188) ensure a mechanical locking   than sheet metal in the groove of the nut.   o Assembly according to claim 1, characterized in that the perforated part (26, 126) is cylindrical and that the inner side wall (38, 138) of the groove (36, 136) is essentially perpendicular to the bottom (40, 140) of the groove (36, 136).   16. Assembly according to one of claims 14, or 15,   characterized in that the polygonal perforating nut (20, 120). at each corner.   17. Assembly according to one of claims 14 to 16, charac-   terized in that the second part (86, 186) of the deformed sheet is at least partially deformed in the recessed parts (44, 144).