EP1480782B1 - Procede de pose de rivets auto-perforants - Google Patents

Procede de pose de rivets auto-perforants Download PDF

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Publication number
EP1480782B1
EP1480782B1 EP03709000A EP03709000A EP1480782B1 EP 1480782 B1 EP1480782 B1 EP 1480782B1 EP 03709000 A EP03709000 A EP 03709000A EP 03709000 A EP03709000 A EP 03709000A EP 1480782 B1 EP1480782 B1 EP 1480782B1
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EP
European Patent Office
Prior art keywords
workpieces
cavity
self
die
rivet
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03709000A
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German (de)
English (en)
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EP1480782A4 (fr
EP1480782A2 (fr
Inventor
Toru Kato
Hironori Umemura
Nobuharu Naitoh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Newfrey LLC
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Newfrey LLC
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Publication of EP1480782A4 publication Critical patent/EP1480782A4/fr
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Publication of EP1480782B1 publication Critical patent/EP1480782B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/36—Rivet sets, i.e. tools for forming heads; Mandrels for expanding parts of hollow rivets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/02—Riveting procedures
    • B21J15/025—Setting self-piercing rivets

Definitions

  • the present invention relates to a method of riveting using a self-piercing rivet setting apparatus having a punch and a die which are operable to drive a self-piercing rivet into a plurality of workpieces positioned between the punch and die, said self-piercing rivet having a large-diameter head and a hollow leg extending downward from said head, wherein when said self-piercing rivet is driven into said workpieces, said leg of said self-piercing rivet is driven to pierce said workpieces while allowing a front end of said leg to be expandingly deformed in its radially outward direction and to be retained in said workpieces without passing therethrough, so as to connect said plurality of workpieces with each other by said expanded leg and said head.
  • a method according to the preamble of claim 1 is disclosed in US-A-5 752 305.
  • the self-piercing rivet comprises a large-diameter head and a hollow leg extending downward from the head.
  • the leg of the rivet is driven to pierce the workpieces while allowing the front end of the leg to be expandingly deformed, so as to connect the workpieces with one another by the deformed leg and the head.
  • the self-piercing rivet is driven to allow it to pass through a punch-side workpiece but to stay in a receiving-side workpiece adjacent to the die without passing therethrough, the rivet does not form any penetrating hole in the surface of the receiving-side workpiece. This provides an advantage of maintaining a sealing performance and good appearance of the receiving-side workpiece.
  • Fig. 1 shows a sectional view of the connecting portion of the workpieces connected by the conventional self-piercing rivet.
  • the self-piercing rivet 1 comprises the large-diameter head 5 and the hollow leg 6 extending downward from the head.
  • the self-piercing rivet 1 is driven into two workpieces 2 and 3 by the punch and the die (not shown) of the setting apparatus.
  • the leg 6 of the rivet is driven to pierce the workpieces (such as the body panels) while allowing the front end of the leg 6 to be expandingly deformed, so as to connect the punch-side workpiece 2 and the receiving-side workpiece 3 by the deformed leg 6 and the large-diameter head 5.
  • the present invention is directed to solve these problems, and therefore it is an object of the present invention to provide a rivet setting method capable of connecting workpieces by a self-piercing rivet, and to achieve a sufficient connecting force.
  • a method of riveting using a self-piercing rivet setting apparatus having a punch and a die which are operable to drive a self-piercing rivet into a plurality of workpieces positioned between the punch and die, said self-piercing rivet having a large-diameter head and a hollow leg extending downward from said head, wherein when said self-piercing rivet is driven into said workpieces, said leg of said self-piercing rivet is driven to pierce said workpieces while allowing a front end of said leg to be expandingly deformed in its radially outward direction and to be retained in said workpieces without passing therethrough, so as to connect said plurality of workpieces with each other by said expanded leg and said head, wherein said die comprises a cavity for receiving therein a protruded workpiece zone consisting of respective portions of said workpieces to be protrudingly deformed toward said die through the pressure of said self-piercing rivet pressed by said punch, and wherein said
  • the upper end of the outer wall has a bevel or a radius which is very small.
  • the central raised portion of the cavity allows the leg of the self-piercing rivet to be expandingly deformed in its radially outward direction while the self-piercing rivet penetrating into the workpieces.
  • the material of the workpieces in the protruded workpiece zone flows along the central raised portion of the cavity in the radially outward direction thereof.
  • the material of the workpieces in the protruded workpiece zone then flows along the curved inner surface of the cavity from the bottom toward the outer wall of the cavity, and flows upward along the outer wall of the cavity after changing its direction. Further, the material of the workpieces in the protruded workpiece zone flows toward the center of the cavity.
  • the receiving-side workpiece is squeezed at the upper part of the cavity, and thus an undercut is formed so that the workpieces can be connected reliably.
  • Fig. 2 schematically shows the entire structure of a self-piercing rivet setting apparatus 9 used in one embodiment of the present invention.
  • the self-piercing rivet setting apparatus 9 includes a C-shaped frame 11.
  • the C-shaped frame 11 is an integral body including an upper horizontal arm region, a lower horizontal arm region, and a vertical arm region coupling the upper and lower horizontal arm regions.
  • the C-shaped frame 11 can be deformed elastically to absorb an impact force during the rivet-driving operation.
  • the vertical arm region of the C-shaped frame 11 has a coupling portion 10 to be coupled with an articulated robot arm (not shown).
  • a setting mechanism 13 of the self-piercing rivet setting apparatus is attached to one end of the upper horizontal arm region.
  • the setting mechanism 13 is provided with a punch 14 on the underside thereof attached movably in the vertical direction.
  • a receiver unit 15 is provided further below the punch 14 to hold the self-piercing rivet.
  • a die 18 is attached to the end of the lower horizontal arm region of the C-shaped frame 11.
  • a spindle-driving unit 17 is provided above the punch 14.
  • the spindle-driving unit 17 comprises an electric driving motor 19, a reduction gear mechanism 21 and a gear mechanism 22 for transmitting a rotation force of the motor, and a spindle 23 adapted to move vertically while rotating according to the rotation force from the gear mechanism 22.
  • the spindle-driving unit 17 is operable to press the punch 14 downward so as to drive the self-piercing rivet 1 held in the receiver unit 15 on the underside of the punch into the workpieces held on the die 18.
  • Fig. 3 shows the die 18 used in one embodiment of the present invention.
  • the die 18 includes a cavity 25 having a specific configuration.
  • the cavity 25 of the die 18 is adapted to receive therein the self-piercing rivet and the workpieces.
  • the self-piercing rivet and the workpieces are deformed according to the shape of the inner surface of the cavity 25.
  • the cavity 25 is provided with a central raised portion 29.
  • the leg 6 of the rivet 1 pressed by the punch is driven to pierce the workpieces while allowing a portion of the workpieces to be protrudingly deformed into the cavity 25. Since the cavity 25 has a bottom surface provided with the central raised portion 29 protruding from the center of the bottom surface, when the rivet 1 is driven into the workpieces, the leg 6 of the rivet 1 impinges on the central raised portion 29 unable to move in the straight downward direction, and therefore moves expandingly in its radially outward direction. Thus, due to the central raised portion 29, the leg 6 of the rivet is driven to pierce the workpieces while expanding in its radially outward direction. Therefore, the connecting strength of the workpieces is enhanced.
  • the angle A of the top of the central raised portion 29 is between 90 and 160 degrees inclusive. When the angle A is in this range, the material flow in the workpieces at the time of connecting operation is improved.
  • the top of the central raised portion 29 preferably has a spherical shape with the radius of B. Making it spherical facilitates the material of the workpieces to flow in the outward direction.
  • the cavity 25 is formed an approximately cylindrical outer wall 27. With the outer wall 27, the material of the workpieces flows upward along the outer wall 27.
  • the outer wall 27 has an upper end with the inner diameter D which is not too large compared with the outer diameter of the leg of the rivet.
  • the upper inner diameter D of the outer wall 27 is:
  • the upper inner diameter D of the outer wall the outer diameter of the leg of the rivet + the thickness of the receiving-side workpiece adjacent to the diex4.
  • the material of the workpieces that has flowed upward along the outer wall 27 further flows toward the center of the cavity 25.
  • the outer wall 27 has the upper portion that has a larger diameter than the lower portion.
  • ⁇ > 90 degree it is easier to remove connected workpieces from the die.
  • the bevel or the radius R provided on the upper end 31 of the outer wall 27 of the cavity 25 is preferably made as small as possible.
  • the cavity has a curved inner surface extending from the top of the central raised portion 29 to the lower end 33 of the outer wall 27 through the bottom 35 of the cavity.
  • the material of the workpieces flows outward by the central raised portion 29 toward the outer wall 27 through the bottom 35 of the cavity, and further flows upward along the outer wall 27 after changes its direction smoothly.
  • Fig. 4 shows the die 18' used in a second embodiment of the present invention.
  • the outer wall 27' has the upper portion which has a smaller diameter than the lower portion.
  • the second embodiment is similar to the first embodiment.
  • the receiving-side workpiece adjacent to the die has a squeezed configuration in the upper part of the cavity, and thus the workpieces are connected more reliably than the first embodiment.
  • Fig. 5 is a sectional view illustrating the state when the workpieces 2 and 3 are placed on top of the other on the die 18 and before they are connected by the self-piercing rivet 1 according to the present invention.
  • the self-piercing rivet 1 is fed from a feeding unit (not shown) to the receiver unit 15, and held in the receiver unit 15 below the punch 14. Between the die 18 and the punch 14 are placed the workpieces 2 and 3.
  • Fig. 6 is a sectional view illustrating the state before the completion of a self-piercing-rivet setting operation where the self-piercing rivet 1 is being pressed into the workpieces 2 and 3 placed on the die (not shown) by the punch (not shown) to connect the workpieces 2 and 3.
  • the punch (not shown) is moved downward by receiving the pressing force from the spindle-driving unit 17 (Fig. 2) to drive the self-piercing rivet 1 into the punch-side workpiece 2.
  • the hollow leg 6 of the self-piercing rivet 1 progressively pierces the workpiece 2.
  • a portion of the workpieces 2 and 3 below the self-piercing rivet 1 is progressively deformed to protrude into the cavity 25 of the die 18.
  • the receiving-side workpiece 3 progressively deforms and surrounds the punch-side workpiece 2.
  • Fig. 7 is a sectional view illustrating the state where the workpieces 2 and 3 are connected.
  • the receiving-side workpiece 3 is squeezed at the upper part of the cavity. This deformation allows the receiving-side workpiece 3 to be connected with the punch-side workpiece 2.
  • the workpieces 2 and 3 removed from the cavity 25 are in the state that the workpieces are squeezed at the upper part of the cavity. Therefore, an undercut is formed after the connection has been made thereby maintaining the connection state of the workpieces 2 and 3.
  • the angle A of the top of the central raised portion 29 of the cavity 25 is between 90 and 160 degrees inclusive.
  • the angle A of the top in this range facilitates the flow of the material of the workpieces in the direction along the central raised portion 29.
  • the top of the central raised portion 29 has a spherical shape with the radius of B.
  • the top with the radius B facilitates the flow of the material of the workpieces that is trapped inside the rivet in the I direction shown in Fig. 6.
  • the material of the workpieces flows in the I direction shown in Fig. 6 by the angle A and the radius B of the top.
  • the cavity 25 has the outer wall 27.
  • the material of the punch-side and receiving-side workpieces flows outwardly and downwardly (the I direction) along the central raised portion 29, and the material of the workpieces further flows along the curved surface through the bottom 35 of the cavity 25 and, after changing its direction, flows in the upward direction along the outer wall 27.
  • the workpieces are pressed by the rivet from above direction. Also, by the rivet-driving operation, a portion of the workpieces that contacts to the periphery of the cavity of the die is crushed between the rivet and the die and work hardened (the H portion). Therefore, the material of the workpieces that has flowed upward along the outer wall 27 cannot move further upward, and thus flows in the direction toward the center of the cavity 25 (the II direction). As a result, the receiving-side workpiece will have a squeezed configuration in the upper part of the cavity, creating a protrusion 8 to form the undercut U.
  • the outer wall 27 has the upper inner diameter D which is not too large compared with the outer diameter of the leg of the rivet.
  • the upper inner diameter D of the outer wall 27 is:
  • the bevel or the radius R provided on the upper end 31 of the outer wall 27 of the cavity 25 is preferably made as small as possible.
  • the cavity has the curved inner surface extending from the top of the central raised portion 29 to the lower end 33 of the outer wall 27 through the bottom 35 of the cavity.
  • this portion of the inner surface has such a curved shape, the material of the workpieces will flow along the inner surface of the cavity by changing its direction smoothly from the I direction to the II direction.
  • Fig. 8 is a sectional view illustrating the state where a thick workpiece 2 and a thin receiving-side workpiece 3 are connected by the self-piercing rivet 1 using a conventional die 4.
  • the thin workpiece 3 is not squeezed at the upper part of the cavity thereby creating no undercut, and thus the workpieces 2 and 3 tend to separate at the interface therebetween.
  • Fig. 9 is a sectional view illustrating the state where the workpieces 2 and 3 are connected by the self-piercing rivet 1 using the die 18 as defined in the method according to the present invention.
  • Example 1 due to the shape of the cavity 25 of the die 18, the material of the workpieces flows well within the cavity 25.
  • the receiving-side workpiece 3 has the squeezed configuration in the upper part of the cavity thereby creating the undercut, and thus the workpieces are reliably connected. As a result, the thick workpiece 2 and the thin receiving-side workpiece 3 are not easily separated.
  • Fig. 10 is a sectional view illustrating the state where three workpieces 2, 2', and 3 are connected by the self-piercing rivet 1 using the conventional die (not shown).
  • the self-piercing rivet 1 does not penetrate through the receiving-side workpiece 3 and therefore a separation tends to occur between the intermediate workpiece 2' and the receiving-side workpiece 3.
  • Fig. 11 is a sectional view illustrating the state where three workpieces 2, 2', and 3 are connected by the self-piercing rivet 1 using the die as defined in the method according to the present invention.
  • the receiving-side workpiece 3 is squeezed at the upper part of the cavity and thus the undercut is formed. Therefore, after the workpieces are connected, the receiving-side workpiece will not separate from the interface therebetween.
  • the workpieces when the workpieces are connected by the self-piercing rivet using the die according to the present invention, a smooth flow of the material of the workpieces can be formed upon connecting the workpieces, and as a result the receiving-side workpiece has the squeezed configuration in the upper part of the cavity, thereby creating the undercut. Therefore, the workpieces can be connected more reliably than the case where the self-piercing rivet connects the workpieces using the conventional die.
  • the receiving-side workpiece is thinner than the punch-side workpiece or when more than two workpieces are connected, even in such cases, a plurality of workpieces can be connected reliably.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Insertion Pins And Rivets (AREA)
  • Control Of Metal Rolling (AREA)
  • Vehicle Body Suspensions (AREA)
  • Dowels (AREA)

Claims (4)

  1. Procédé de rivetage utilisant un dispositif de pose de rivets auto-perforants, comportant un poinçon (14) et une matrice (18) aptes à être commandés pour placer un rivet auto-perforant (1) dans une pluralité de pièces à usiner (2, 3) positionnées entre le poinçon (14) et la matrice (18), ledit rivet auto-perforant (1) ayant une tête à large diamètre (5) et une branche creuse (6) s'étendant vers le bas à partir de ladite tête (5), procédé dans lequel, lorsque ledit rivet auto-perforant (1) est posé dans lesdites pièces à usiner (2, 3), ladite branche (6) dudit rivet auto-perforant (1) est introduite pour percer lesdites pièces à usiner (2, 3) tandis qu'une extrémité frontale de ladite branche (6) est amenée à se déformer par expansion dans sa direction radialement extérieure et à être retenue dans lesdites pièces à usiner (2, 3) sans passer au travers de celles-ci, afin de raccorder ladite pluralité de pièces à usiner (2, 3) entre elles au moyen de ladite branche en expansion (6) et de ladite tête (5), ladite matrice (18) comportant une cavité (25) pour recevoir une zone saillante de pièce à usiner consistant en des portions respectives desdites pièces à usiner (2, 3) amenées à se déformer de manière saillante vers ladite matrice (18) sous l'effet de la pression exercée par ledit rivet auto-perforant (1) soumis à la pression dudit poinçon (14) et ladite cavité (25) présentant une surface inférieure (35) comportant une portion centrale relevée (29) dépassant du centre de la surface inférieure (35) en direction d'un poinçon (14), ladite portion centrale relevée (29) de ladite cavité (25) formant un angle vertical dans la plage de 90 à 160 degrés, et ladite cavité (25) ayant une surface intérieure incurvée s'étendant de la partie supérieure de ladite portion relevée (29) vers l'extrémité inférieure (33) d'une paroi extérieure à travers la partie inférieure de ladite cavité (25),
    caractérisé en ce que
    ladite cavité (25) présente une paroi extérieure (27) sensiblement cylindrique sur sa périphérie, ladite paroi extérieure (27) de ladite cavité (25) ayant une extrémité supérieure (31) dont le diamètre intérieur (D) est égal au : [ diamètre extérieur de la branche   ( 6 )  du rivet   ( 1 ) + l ′ épaisseur de la pièce à usiner  ( 3 )  adjacente à la matrice   ( 18 ) × 4 ] ± 10 % .
    Figure imgb0006
  2. Procédé selon la revendication 1, dans lequel la partie supérieure de ladite portion centrale relevée (29) est de forme sphérique.
  3. Procédé selon la revendication 1, dans lequel l'extrémité supérieure (31) de ladite paroi extérieure (27) de ladite cavité (25) présente un très petit chanfrein ou rayon.
  4. Procédé selon la revendication 1, dans lequel le diamètre intérieur de l'extrémité supérieure (31) de ladite paroi extérieure (27) de ladite cavité (18) est sensiblement égal au : [ diamètre extérieur de la branche   ( 6 )  du rivet   ( 1 ) + l ′ épaisseur de la pièce à usiner  ( 3 )  adjacente à la matrice   ( 18 ) × 4 ] .
    Figure imgb0007
EP03709000A 2002-02-08 2003-02-06 Procede de pose de rivets auto-perforants Expired - Lifetime EP1480782B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2002032538A JP2003230935A (ja) 2002-02-08 2002-02-08 自動穿孔リベット締結装置及び該装置に使用するダイ
JP2002032538 2002-02-08
PCT/US2003/003725 WO2003066278A2 (fr) 2002-02-08 2003-02-06 Appareil de pose de rivets auto-perforants et sa matrice

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EP1480782A2 EP1480782A2 (fr) 2004-12-01
EP1480782A4 EP1480782A4 (fr) 2005-07-06
EP1480782B1 true EP1480782B1 (fr) 2006-08-30

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EP (1) EP1480782B1 (fr)
JP (1) JP2003230935A (fr)
AT (1) ATE337869T1 (fr)
DE (1) DE60307990T2 (fr)
WO (1) WO2003066278A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
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WO2019100641A1 (fr) * 2017-11-22 2019-05-31 烟台亿拉得包装科技股份有限公司 Procédé de formage de rivet à tirette et moule

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CN1301165C (zh) * 2004-08-12 2007-02-21 中国科学院金属研究所 一种铝合金汽车框架爆炸式自铆接设备和方法
GB201019021D0 (en) * 2010-11-11 2010-12-22 Henrob Ltd A rivet
US9249816B2 (en) * 2013-12-13 2016-02-02 Ford Global Technologies, Llc Methods for joining more than two panels together
CN104741501A (zh) * 2015-03-30 2015-07-01 上海应用技术学院 内缩式半空心自冲铆铆钉装置
DE102016103999A1 (de) * 2016-03-04 2017-09-07 Böllhoff Verbindungstechnik GmbH Stanznietmatrize
JP6668989B2 (ja) * 2016-07-15 2020-03-18 日産自動車株式会社 セルフピアスリベット接合方法およびセルフピアスリベット接合装置
CN106984760A (zh) * 2017-03-07 2017-07-28 昆明理工大学 一种应用于户外广告牌的自冲铆接方法
JP6583342B2 (ja) * 2017-04-17 2019-10-02 マツダ株式会社 リベット接合用金型
CN110017319B (zh) * 2019-04-16 2024-03-22 宾科精密部件(中国)有限公司 一种铆钉

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019100641A1 (fr) * 2017-11-22 2019-05-31 烟台亿拉得包装科技股份有限公司 Procédé de formage de rivet à tirette et moule

Also Published As

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WO2003066278A3 (fr) 2004-05-06
WO2003066278A2 (fr) 2003-08-14
DE60307990D1 (de) 2006-10-12
EP1480782A4 (fr) 2005-07-06
ATE337869T1 (de) 2006-09-15
EP1480782A2 (fr) 2004-12-01
JP2003230935A (ja) 2003-08-19
DE60307990T2 (de) 2007-09-06

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