SELF-PIERCING RIVET JOINT AND SELF-PIERCING RIVET
원문보기
IPC분류정보
국가/구분
United States(US) Patent
공개
국제특허분류(IPC7판)
F16B-019/08
B21J-015/02
출원번호
17430609
(2020-03-20)
공개번호
20220145921
(2022-05-12)
우선권정보
DE-10 2019 204 826.9 (2019-04-04)
국제출원번호
PCT/EP2020/057729
(2020-03-20)
발명자
/ 주소
HORNBOSTEL, Norbert
HELLMEIER, Heiko
BARKHAUSEN, Frank Björn
출원인 / 주소
AUDI AG
인용정보
피인용 횟수 :
0인용 특허 :
0
초록▼
A self-piercing rivet joint, having at least two components made of formable metallic materials having a strength up to 300 MPa, which are connected to one another in a riveting procedure, in which a self-piercing rivet pierces the first, stamp-side component with a setting force and is driven into
A self-piercing rivet joint, having at least two components made of formable metallic materials having a strength up to 300 MPa, which are connected to one another in a riveting procedure, in which a self-piercing rivet pierces the first, stamp-side component with a setting force and is driven into the second, die-side component, specifically while maintaining a residual base thickness in the second component and while spreading out the self-piercing rivet to a spreading diameter in the second component. The self-piercing rivet is compressed after the riveting procedure down to 60% of its starting length and the spreading diameter is enlarged up to 140% to 150%, in particular to up to 140% of the rivet shaft diameter, specifically without damaging the self-piercing rivet by self-piercing rivet material cracks.
대표청구항▼
1-10. (canceled) 11. A self-piercing rivet joint, comprising at least two components made of formable metallic materials having a strength up to 300 MPa, in particular aluminum materials, which are connected to one another in a riveting procedure, in which a self-piercing rivet pierces the first, st
1-10. (canceled) 11. A self-piercing rivet joint, comprising at least two components made of formable metallic materials having a strength up to 300 MPa, in particular aluminum materials, which are connected to one another in a riveting procedure, in which a self-piercing rivet pierces the first, stamp-side component with a setting force and is driven into the second, die-side component, specifically while maintaining a residual base thickness in the second component and while spreading out the self-piercing rivet to a spreading diameter in the second component, wherein the self-piercing rivet is compressed after the riveting procedure down to 60% of its starting length and the spreading diameter is enlarged up to 140% to 150%, in particular to up to 140% of the rivet shaft diameter, specifically without damaging the self-piercing rivet by self-piercing rivet material cracks. 12. The self-piercing rivet joint as claimed in claim 11, wherein the still undeformed self-piercing rivet has a cylindrical rivet shaft having an inner curvature, which is open toward the shaft tip and is spherical-cap-shaped in particular, and a rivet head larger in diameter in relation to the rivet shaft diameter, and wherein after the riveting procedure, the self-piercing rivet inner curvature is essentially completely filled up by self-piercing rivet material due to material flow during the riveting procedure, and wherein the shaft tip has an essentially planar end face after the riveting procedure, or a rounded end face having a large radius in relation to the rivet dimensions. 13. The self-piercing rivet joint as claimed in claim 11, wherein the inner curvature, in the undeformed state, protrudes starting from the shaft tip with a curvature depth in the axial direction into the rivet shaft, and wherein the curvature depth is between 10% and 25%, in particular 15%, of the self-piercing rivet total length, and/or wherein the rivet head material thickness, which extends along the rivet longitudinal axis between a rivet head upper side and the inner curvature, is between 75% and 90%, in particular 85%, of the self-piercing rivet total length. 14. The self-piercing rivet joint as claimed in claim 12, wherein the transition between the rivet shaft and the rivet head is formed by a rounded rivet head lower side having uniform head radius, and wherein the rounded rivet head lower side merges tangentially radially outward into a planar, conical rivet head lower side, which extends up to a rivet head boundary, and/or wherein the planar, conical rivet head lower side is set diagonally upward in the direction of the rivet head upper side by a cone angle in relation to a horizontal plane, and wherein the head radius is between 0.8 mm and 2.0 mm, and/or the cone angle is in an order of magnitude of 20°. 15. The self-piercing rivet joint as claimed in claim 11, wherein the self-piercing rivet is a flat head rivet having a planar rivet head upper side, and in that, in the self-piercing rivet joint, the rivet head upper side is aligned surface flush, that is to say without head protrusion, with the surface of the first, stamp-side component, and in particular is not raised in relation to the integral component surface, and wherein a circumferential rivet head boundary extends radially outward between the rivet head lower side and the rivet head upper side over a head lateral height, and wherein the head lateral height is in particular 0.3 mm. 16. The self-piercing rivet joint as claimed in claim 11, wherein on the shaft tip facing away from the rivet head, a ring-shaped circumferential placement edge delimiting the inner curvature is formed, and wherein the placement edge acts as a cutting edge during the riveting procedure, using which, on the one hand, early compression of the self-piercing rivet can be suppressed, and, on the other hand, spreading out of the self-piercing rivet by a predefined spreading amount radially outward is controllable, and wherein a wall of the self-piercing rivet inner curvature and a rivet shaft outer circumference run together at an acute angle, in particular at an edge angle of 45°, at the placement edge, and/or in that the placement edge is rounded with a rounding radius in the range of 0.15 mm. 17. The self-piercing rivet joint as claimed in claim 11, wherein in the undeformed state, the self-piercing rivet total length is 4 to 8 mm, in particular between 4.5 mm and 6.0 mm, the rivet head diameter is 4.5 to 8.5 mm, in particular 5.5 mm or 7.75 mm, and/or the rivet shaft diameter is 2.8 mm to 6.6 mm. 18. The self-piercing rivet joint as claimed in claim 11, wherein the base material of the self-piercing rivet is a wire material made of cold extrusion steel or cold heading steel, and/or wherein the self-piercing rivet has a low strength in comparison to conventional self-piercing rivets, but significantly greater ductility, and wherein the strength of the self-piercing rivet in the starting state without strain hardening is between 600 MPa and 1000 MPa, in particular between 750 MPa and 900 MPa. 19. The self-piercing rivet joint as claimed in claim 11, wherein the material thickness ratio between the first, stamp-side component and the second, die-side component is between 1:1 and 1:3, and in that in particular the material thickness of the first, stamp-side component is less than or equal to 1.3 mm. 20. A self-piercing rivet for a self-piercing rivet joint as claimed in claim 11. 21. The self-piercing rivet joint as claimed in claim 13, wherein the transition between the rivet shaft and the rivet head is formed by a rounded rivet head lower side having uniform head radius, and wherein the rounded rivet head lower side merges tangentially radially outward into a planar, conical rivet head lower side, which extends up to a rivet head boundary, and/or wherein the planar, conical rivet head lower side is set diagonally upward in the direction of the rivet head upper side by a cone angle in relation to a horizontal plane, and wherein the head radius is between 0.8 mm and 2.0 mm, and/or the cone angle is in an order of magnitude of 20°. 22. The self-piercing rivet joint as claimed in claim 12, wherein the self-piercing rivet is a flat head rivet having a planar rivet head upper side, and in that, in the self-piercing rivet joint, the rivet head upper side is aligned surface flush, that is to say without head protrusion, with the surface of the first, stamp-side component, and in particular is not raised in relation to the integral component surface, and wherein a circumferential rivet head boundary extends radially outward between the rivet head lower side and the rivet head upper side over a head lateral height, and wherein the head lateral height is in particular 0.3 mm. 23. The self-piercing rivet joint as claimed in claim 13, wherein the self-piercing rivet is a flat head rivet having a planar rivet head upper side, and in that, in the self-piercing rivet joint, the rivet head upper side is aligned surface flush, that is to say without head protrusion, with the surface of the first, stamp-side component, and in particular is not raised in relation to the integral component surface, and wherein a circumferential rivet head boundary extends radially outward between the rivet head lower side and the rivet head upper side over a head lateral height, and wherein the head lateral height is in particular 0.3 mm. 24. The self-piercing rivet joint as claimed in claim 14, wherein the self-piercing rivet is a flat head rivet having a planar rivet head upper side, and in that, in the self-piercing rivet joint, the rivet head upper side is aligned surface flush, that is to say without head protrusion, with the surface of the first, stamp-side component, and in particular is not raised in relation to the integral component surface, and wherein a circumferential rivet head boundary extends radially outward between the rivet head lower side and the rivet head upper side over a head lateral height, and wherein the head lateral height is in particular 0.3 mm. 25. The self-piercing rivet joint as claimed in claim 12, wherein on the shaft tip facing away from the rivet head, a ring-shaped circumferential placement edge delimiting the inner curvature is formed, and wherein the placement edge acts as a cutting edge during the riveting procedure, using which, on the one hand, early compression of the self-piercing rivet can be suppressed, and, on the other hand, spreading out of the self-piercing rivet by a predefined spreading amount radially outward is controllable, and wherein a wall of the self-piercing rivet inner curvature and a rivet shaft outer circumference run together at an acute angle, in particular at an edge angle of 45°, at the placement edge, and/or in that the placement edge is rounded with a rounding radius in the range of 0.15 mm. 26. The self-piercing rivet joint as claimed in claim 13, wherein on the shaft tip facing away from the rivet head, a ring-shaped circumferential placement edge delimiting the inner curvature is formed, and wherein the placement edge acts as a cutting edge during the riveting procedure, using which, on the one hand, early compression of the self-piercing rivet can be suppressed, and, on the other hand, spreading out of the self-piercing rivet by a predefined spreading amount radially outward is controllable, and wherein a wall of the self-piercing rivet inner curvature and a rivet shaft outer circumference run together at an acute angle, in particular at an edge angle of 45°, at the placement edge, and/or in that the placement edge is rounded with a rounding radius in the range of 0.15 mm. 27. The self-piercing rivet joint as claimed in claim 14, wherein on the shaft tip facing away from the rivet head, a ring-shaped circumferential placement edge delimiting the inner curvature is formed, and wherein the placement edge acts as a cutting edge during the riveting procedure, using which, on the one hand, early compression of the self-piercing rivet can be suppressed, and, on the other hand, spreading out of the self-piercing rivet by a predefined spreading amount radially outward is controllable, and wherein a wall of the self-piercing rivet inner curvature and a rivet shaft outer circumference run together at an acute angle, in particular at an edge angle of 45°, at the placement edge, and/or in that the placement edge is rounded with a rounding radius in the range of 0.15 mm. 28. The self-piercing rivet joint as claimed in claim 15, wherein on the shaft tip facing away from the rivet head, a ring-shaped circumferential placement edge delimiting the inner curvature is formed, and wherein the placement edge acts as a cutting edge during the riveting procedure, using which, on the one hand, early compression of the self-piercing rivet can be suppressed, and, on the other hand, spreading out of the self-piercing rivet by a predefined spreading amount radially outward is controllable, and wherein a wall of the self-piercing rivet inner curvature and a rivet shaft outer circumference run together at an acute angle, in particular at an edge angle of 45°, at the placement edge, and/or in that the placement edge is rounded with a rounding radius in the range of 0.15 mm. 29. The self-piercing rivet joint as claimed in claim 12, wherein in the undeformed state, the self-piercing rivet total length is 4 to 8 mm, in particular between 4.5 mm and 6.0 mm, the rivet head diameter is 4.5 to 8.5 mm, in particular 5.5 mm or 7.75 mm, and/or the rivet shaft diameter is 2.8 mm to 6.6 mm. 30. The self-piercing rivet joint as claimed in claim 13, wherein in the undeformed state, the self-piercing rivet total length is 4 to 8 mm, in particular between 4.5 mm and 6.0 mm, the rivet head diameter is 4.5 to 8.5 mm, in particular 5.5 mm or 7.75 mm, and/or the rivet shaft diameter is 2.8 mm to 6.6 mm.
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