DE8002790U1 - Stud bolts with punching and riveting behavior - Google Patents

Description

1 I «

I _1. "; Ί

I ι I HI

The invention relates to a panel or the like to be fastened studs, its substantially cylindrical Body consisting of a shaft, optionally provided with a thread, and a head at one end of the shaft consists "The invention also relates to a device for fastening such stud bolts to sheet metal" plates, Boards and the like

Known stud bolts of the type mentioned are attached to metal sheets, plates or panels - hereinafter referred to only as \ "panels" - by the stud bolts

is pressed with the head end on one side of the board by welding and thus fixed.

Headed studs that can be inserted into a panel are also known. These studs are passed through an opening in a pre-punched board and riveted to the board in the area of the head end. The use of these studs results in considerable assembly difficulties with regard to both the vertical alignment of the studs to the panel as well as the strength of the riveted joint to be achieved. Since these studs are only in one Opening can be attached to prepunched boards, bind at least two operations to fix it required, namely pre-punching the panel and inserting the stud bolts into this panel. Still will this rivet fastening of the studs preferred to fastening by welding, since in particular in the Mass production complex and expensive automatic welding machines can only be used for one molded part.

The invention is based on the object of creating a stud bolt that allows configurations that lead to

Savings, especially in the fastening workflow lead the stud on a board ",

On the basis of the general inventive concept of giving the stud bolt itself riveting behavior, this object is achieved in that a stamped part is arranged on one end of the stud bolt. The stamped part can be formed at the head end of the stud bolt, preferably on a pressure surface of the head facing away from the shaft, so that after the stud bolt has been inserted into a panel, the shaft protrudes beyond a surface of the panel. The invention has the particular advantage that the |; © rfindungsgemäße studs can be used in self-piercing the board '■, ie an operation, namely the \> pre-drilling is not necessary.

If, in an embodiment of the invention, the stamped part consists of a;

coaxial recess and a Ϊ surrounding the recess

Rent wedge exists, then a front edge of the rivet wedge, |

preferably the front edge facing the recess as f

Be formed cutting or punching edge. J

The rivet head is preferably provided with an outer wedge wall that tapers towards the head and is formed by the outer circumference of the free punching head face ^! provided, while a joint surface extending approximately perpendicular to the axis of the stud bolt extends between the cutting edge and the joint edge. This results calibration for a Nietkell the punching operation especially facilitated j ternde form. :

The outer collewall can merge into the pressure surface of the head as a curve. When the self- locking bolt is removed, the rivet through the rivet can

• · I ι ι ι
• - * ι fill I

ι:

L-shaped, radially outwardly vercrate rivet wedge ^ with the The pressure surface of the head forms a circumferential groove on the rivet wedge that is flush with the surrounding panel material.

In a further embodiment, the recess is provided to the axis of the stud bolt M ″ depending on the thickness of the panel to be provided with the stud bolts, increased or recessed into the recess Panel of material plaster arched in the shape of a spherical shell from the floor, radially expanded, the inner wall of the recess is deformed tightly, while the recessed design in the case of a thick panel prevents the tip of the counter-stamp to be explained from being destroyed by the compression of the punched plaster The bottom can be roughly on the same radial plane as the pressure surface of the head.

In a special embodiment of the self-locking stud bolt, in an axial extension of the shaft, a plate attachment can be arranged on a pressing surface adjacent to the shaft on a pressing surface of the Hopfss facing the shaft. This plate approach "proves" to be particularly advantageous when a desired distance has to be maintained between two tables. For this purpose, the shank of a stud Bolzene erfindragsgeaäß used in a sheet is punched by a "second panel out until it abuts this board at FIEM plate approach and then the protruding shaft part mx of argue panel secured, for example v © rni @ t®t or v © screwed.

In further versions, the © rfindungsg® © äÖ® itself « ■ dancing studs a 1 »essential xvdrian Shank and / or can either with the further essentially cylindrical «or with essentially polygonal basin and / or head and / or stump11 provided a. When transporting the stud bolt »for example

I (ι ι. · «Ι« «ι

• · ι <I (II ««

- 10 -

wise in a guide one of the studs in a fafel When the punching and riveting device is used, the polygonal head and / or plate attachment are advantageous as an aid to orientation during a sorting process, while the polygonal punched part has a particularly twist-proof fastening allowed on a blackboard.

In a preferred embodiment, the shaft and / or the plate approach may include an external thread so that the Eineatz as a self-piercing Clinching stud is possible * ¥ pus - / "> out may be a preferably provided with plate approach stud as a hinge connection are, for example, by the shaft a in a panel used stud bolt is provided with an external thread only over part of the shaft length and a second panel eit an opening on this shaft part rotatably, for example, it is attached to Muttarn.

j When the stud bolt is attached to a board, the board can be placed between a press ram holding the stud bolt

j and a die with counter-punch and are preferably punched at the same time as the riveting process. Of the The press ram preferably contains a receptacle for the shaft and / or plate attachment, which is surrounded by a press surface. For example the self-piercing stud bolt according to the invention with the shaft and / or plate attachment is in the receptacle used so that the pressing surfaces of the Preßstempelε and of the studs lie against each other, while the abutment surface of the stud on a side surface of the perpendicular to Axis dos studs arranged board lies.

In a preferred embodiment, the die contains an extension the Achet of the stud bolt is axially sunk, the old of the support is connected by a bending radius

• i> ι

<'I III

• · ι ι 111 ι

'III I Il

* Il I I I I I Il I

1114. » f

- 11 -

and has a base kit, approximately parallel to the support, of a central bore; this contains this hole a cylindrical counter-hole punch that is inserted into the counterbore the die can have a protruding end. This end of the Cregenlochstempel consists of, for example a frustoconical expansion body, the base surface of which can be located approximately at the level of the bottom of the recess. The expansion body preferably extends up to one cylindrical cutting edge set on the free face ▼ can be radially delimited on a cutting edge. Preferably the cutting attachment has a diameter which is adapted to the recess of the stud bolt in such a way that the cutting edges of the stud and the counter-punch can work together when punching the board. An expanding cone is centered on the free face of the cutting attachment arranged, which can protrude above the level of the die support and when inserting the stud into the Board stuck a punched out material plaster in the recess in the punched part of the stud bolt.

The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawings. It demonstrate:

1 shows a self-piercing stud bolt in a partially sectioned side view;

fflg. 2 another self-piercing stud bolt designed as a screw with a plate shoulder;

3 shows a partially sectioned side view of the stud bolt according to FIG. 1 and an embodiment of a punching and rental device;

Fig. H shows a detail of the punching and riveting device of the ** ig. 2;

y ; :. : ■ ·: Ί 5S

12 »

daö connecting element according to Fig * 1 and the StaüSäünd The riveting device according to FIG. 3 in a partially sectioned side view to explain the invention Procedure; and

FIG. 6 shows the arrangements shown in FIGS. 3 and 5 after the insertion of the stud bolt on a board, in a partially sectioned side view.

The self-piercing stud according to the invention is particularly suitable for permanent attachment to a plate or Panel, in particular a sheet metal, or the like is suitable; in the following, only i is used without restrictive meaning spoken of "blackboard". The stud and the one Processing preferably provided punching and riveting devices are especially suitable for use in a conventional press in which the panel is formed. With each stroke of the press, a number of self-punching Studs are connected to the panel.

1 shows a self-piercing stud bolt which is designed as a self-piercing rivet screw 10. This rivet screw 10 consists in. essentially of a cylindrical old externally threaded shaft 20, a t at a shaft end radially outwardly extending f head 30 and a distal extension of the shaft axis on 'the stem 20 side of the head 30 disposed cylindrical punch part 40. ί

If there is a single head 30 on the one free |

Shank end 21 opposite end face and is iiit §

a pressing surface 31 | which forms the end surface in a ring shape

on one side and with one of the pressing surfaces 31 I

opposite, the stamped part 40 annularly surrounding |

- 13 -

Printing area 32 on the other side provided «The printing ' surface 32 is radially delimited by an embossed edge 33. That Punched 40 knows in the free punched part end face 41 • ine centric, »i slightly conical up to eiaea Bottom 42 tapering recess 43. The very high floor 42 extends from the inner wall 44 of the recess 43 in FIG an angle 45 obliquely to the axis of the rivet screw 10. The outer region 42a of the conical bottom 42 and the pressure surface 32 are roughly in one plane. The dash-dotted representation shows the recessed floor design already mentioned for comparatively thick panels.

The recess 43 is surrounded by an annular ridge 46, which has a cutting edge 47 delimiting the recess 43 and an annular abutment surface 48 on the punched part end surface 41. The abutment surface 48 is arranged perpendicular to the axis of the rivet screw 10 and connected to the outer wedge wall 50 via a rounded abutment edge 49. The wedge wall 50 tapers from the abutting edge 49 towards the head with a clearance angle 51 , based on the axis of the rivet screw 10, and merges into the pressure surface 32 of the head 30 with a rounding.

Another version of the self-piercing connecting element is 100 in. as a self-piercing rivet screw Fig. 2 shown and differs from the rivet screw 10 described above in that on the axis the rivet screw 100 has a cylindrical plate shoulder 125 between the end face of a sdt externally threaded | Shank 120 and a head 130 is arranged. This The plate attachment 125 has the end of the shaft 120 in an annular manner surrounding pressing surface 126 and goes ait «in an abin a © adjacent pressing surface 131 of the head 130 over.

The punching and riveting device according to FIG. 3 consists of "Ines Frsßstespel 60 and its matrix 70" with counter-hole

- 14 -

stamp 80 * The press ram 60 is provided with a receptacle 62 for the shaft 20, which is surrounded by a press surface 61. A self-piercing rivet screw 10 according to FIG. 1 is arranged on its shank 20 in the receptacle 62 so that the pressing surface 61 of the press ram 6oj and the pressing surface 31 of the propeller 10 lie against one another and the abutment surface 48 of the hot screw 10 on the side surface of a panel 90 lies.

This panel 90 is perpendicular to the axis of the nesting screw ι arranged and rests on the support 71 of the die 70. The die 70 contains on the extended axis of the The rivet screw 10 ″ has an axial indentation 72 which is connected to the support 71 by a BLeger radius 73. the Countersink 72 has a bottom 74 which runs parallel to the support and has a central bore 75 is provided.

In this bore 75 there is a cylindrical counter-hole punch 80. An end of the counter-hole stack 80 protruding into the recess 72 of the die 70 is shown in FIG and consists of a sump-conical expansion body 81, whose base 82 is approximately at the level of the floor 74 of the There is a recess 72 and which extends as far as a cylindrical cutting attachment 83. This cutting attachment 83 is lost one of the recess 43 dor rivet screw 10 adapted Diameter and is on the free end face of • ner cutting edge 64 m bounded radially with the cutting edge 47. The Hietscrew 10 at the hole punch of the fafel 90 cooperates. Furthermore, the cutting attachment S3 has a central expansion cone 85 on the free end face, & @ r among other things also ensures that during of the first contact of self-piercing stud bolts, board and counter-perforated pad, lateral relative movements are no longer possible.

,, ι

■ Hi

- 15

¹ An intermediate stage of the process of inserting a liiet screw 10 according to FIG. ₄ 1 »with the aid of a punching and riveting device according to FIG. 3 in the panel 90 is shown in FIG.

When the press stack 60 is moved relative to one another with the self-piercing rivet screw 10 on the one hand and the die 70 with the counter-hole stack 80 and the table

90, on the other hand, becomes the one covering the die recess 72 Panel part from the abutment surface 48 of the left screw 10 over the bending radius 73 into the recess 72 of the die 70 deformed into it. The panel 90 is then between the Cutting edge 47 of rivet screw 10 and cutting edge 84 of counter / .och punch 80 sheared and thereby a diameter the recess 43 of the rivet screw 10 is punched out of the panel 90 corresponding plaster 91. This is about the expansion cone 85 of the counter-hole punch 80 arching plasters

91 is pushed into the kenisch tapering recess 43 when moving on from the expansion cone 85.

Furthermore, the rivet wedge 46 of the rivet screw 10 is pressed against the outer surface of the expansion body 81 ssl Geger hole punch 80 and L-shaped radially outwardly on the bottom 74 of the die recess 72, so that the L-shaped reed wedge 46 with the pressure surface 32 of the head 30 forms a circumferential groove 52 on rivet wedge 46. The part of the panel 90 deformed into the die recess 72 is then deformed into this circumferential groove 52.

At the same time, the separated plaster 91 according to FIG. 6 is moved by the expanding cone 85 against the conically raised floor 42 the recess 43 is pressed into ier rivet screw 10. Of the

- 16 - I.

Expanding cone 85, like the bottom 42, is then connected pressed centrally into the plaster 91 and this as a result Deformed radially outwards and thus firmly clamped in the recess 43. Fig. 6 also shows that the pressure surface 32 of the rivet screw 10 is pressed into the adjacent side of the panel 90. At this press-in the riveted connection of the rivet wedge 46 and the panel 90 is upset. The Hietkeil 46 is therefore between the sheet material 90 lying on the outside and the plaster 91 clamped in the recess 43. The rivet screw 10 is thus firmly attached to the panel 90 and, in particular, secured against rotation, without the need for additional safety measures or special adaptations are required, with the at the same time time-saving, one-step fastening cycle is particularly to be emphasized.

Claims (5)

I 1 II: ■ DnHng, Reimar König '···' '"Όίρί.- ing. Klaus Bergen Cacilianallaa 7B 4 Düsseldorf 3D Telafon 45SODB Patentanwälte G 80 02 790.3 March 15, 1982 PROFIL -verbindstechnik GmbH & Co.KG, Otto- Hahn-Straße 22-24, 6382 Friedrichsdorf "Studs with punching and riveting behavior" Protection claims: 1. On boards or the like. Stud bolt to be fastened, the essentially cylindrical body of which consists of a possibly threaded shaft and a head at one end of the shaft, characterized by a deformable punched and riveted part (40, 140) to be anchored with a recess (43 ), which is designed in such a way that the punched plaster (91) produced when the sheet material (90) penetrates it remains in the recess (.43) of the punched and riveted part (40, 140). f \ 2. Stud according to claim 1, characterized in that the punching and riveting part (40, 140) is formed on a pressure surface (32) of the head (30, 130) facing away from the shaft (20, 120). 3. stud bolt according to claims 1 to 2, characterized in that a) in the axial extension of the shaft (20, 120) Guide or spacer shoulder (125) with a contact surface (126) on one facing the shaft (120) Pressing surface (131) of the head (130) is arranged that <<> t Il Il llll 14 ti < Il Il Il ■ Il Il i ¹¹ IIII <11141 ■ • ■■■ I I l Ii < I. ■ · I I I I t 1 j ι ι ·· Il Il IMI I Il I ι M ι ftf «r · ■ · · * b) preferably the shaft (20, 120) and the guide and spacer shoulder (125) are provided with a thread and the punching and riveting part (40, 140) are preferably polygonal, and / or that c) the shaft (20, 120) and the guide and spacer shoulder (125) are preferably polygonal are. 4. Stud according to one or more of claims 1 to 3, characterized in that the punching and riveting part (40, 140) has a closed jacket (46) surrounding the coaxial recess (43). 5. stud bolt according to one or more of claims 1 to 4, characterized in that the front edge of the punched and riveted part (40, 140) facing the recess (43) is designed as a cutting edge (47) for burr-free separation of the punched plaster (91) from the sheet material (90). 6. stud bolt according to one or more of claims 1 to 5, characterized in that the punching and riveting part (40, 140) has a pushing and pulling edge (49) towards the head (30, 130) formed on the outer circumference of the free punching part end face (41) and provided with a rounding preferably tapering wedge wall (50) is provided, while between the cutting edge (47) and the rounded abutting and drawing edge (49) extends approximately perpendicular to the axis of the stud bolt (10, 100) abutting and drawing surface (48, 41 ^N ) . · »Ι> ι if > t ι ι if μ «■! '! · Ι ti Ii ι i, i / i ¹ '"! II << Ii IKI I Il Il I. »II <4 I i * iI IIII , Hit Il (I It. 3 - 7, stud bolts after one or more of the AnäprUöhe 1 big 6, characterized by a rounded transition of the outer wedge wall (50) in the pressure surface (32) to j a connection to the standing f to reach bolts (10, 100) and plate material (90). f 8. stud bolt according to one or more of claims 1 to _i 7, _f characterized in that the protruding into the recess (43) bottom (42) is carried out increases " 9 * Stud according to one or more of Claims 1 to 7, characterized in that the base (42) protruding into the recess (43) is recessed. 10. The device for attaching the stud bolt according to one or more of claims 1 to 9 with a press ram and a die with counter-hole punch, characterized in that a) a known press ram (60) as part of a device for automatic separation of stud bolts (10, 100) with punching and riveting v hold one of the pressing surface (61) surrounded on has received (62) for shaft and / or guide and spacer shoulder (125), the self-punching Stud bolts (10, 100) with the shaft (20, 120) and £ / or the guide and distance shoulder (125) in the | Recording (62) is arranged, the pressing surface (61) of the ram (60) and the pressing surface (31, 126, 131) of the stud bolt (10, 100) on one side of a perpendicular to the axis of the stud bolt (10, 100) arranged panel (90) lie that 4 - * b) the board (90) with an opposite side surface on a support (71) of the die (70) if the die (70) lies in the extension of the axis of the stud bolt (10, 100) one with the support (71) has an axial indentation (72) connected by a bending radius (73) with a base (74) which is essentially parallel to the support (71) and in a starting from the bottom (74) of the depression (72) / central bore (75) a cylindrical counter punch (80) is arranged, and that c) the counter-hole punch (80) has an end protruding into the recess (72) with a frustoconical, down to a cylindrical cutting attachment (83) extending expansion body (81) with the on its free end face of a cutting edge (84), one of the recess (43) of the stud bolt (10, 100) having an adapted diameter Cutting attachment (83) as well as an expanding cone (85) arranged centrally on the free end face of the cutting attachment (83). 11. Punching and riveting device according to claim 10, characterized in that there is a base surface (82) of the expansion body (81) approximately at the level of the bottom (74) of the die recess (72). 12. punching and riveting device according to claim 10 or 11, characterized in that the tip of the expansion cone (85) protrudes beyond the plane of the support (71) of the die (70) ί <MM M Mil ti til I t I 111 it 114 ι It fill I I I I Il It 5 - Isj standing pin fastening with a stud bolt according to one or more of claims 1 to 9, preferably using a device according to one or more of claims 10 to 12, characterized by a radial L-shaped deformation of the starch part (40, 140) outwards with the formation of a Overhanging hat (52) with the head (30, 130). 14 * · stud fastener according to claim 13, wherein f \ through a riveted connection of the punching part (4O _{1140) t} between the outside applied to it panel material (90) and the jammed in the recess (43) of the Stänzteils teeth (91) NS