Punch rivet and die
AssigneeSumanjit Singh
InventorsSumanjit Singh, Wolfgang Wenzl
Life of this patent
Estimating the term…
Abstract
A punch rivet and a die for the production of a punch rivet connection are described. The punch rivet is characterized by special rivet foot and underhead geometries. In the region of the rivet foot, the shank outer face and shank inner face are connected by means of a small radially outer radius and a larger radially inner radius, which radii merge into one another tangentially. The angle that the common tangent encloses with a radial plane is in the range of 10°±20°. The die is preferably matched to the described punch rivet, but can also be used in combination with conventional punch rivets.
Claims14
A die and punch rivet connection comprising:
- a punch rivet;
- parts structured and arranged to be joined to one another via the punch rivet;
- and
- said punch rivet connection being formed by a die cavity delimited by a die floor of the die and a cylindrical circumferential face,
- wherein, with regard to a die diameter DM and a depth TM of the die cavity, the die is structured so that for the parts to be joined that are made of deformable materials:
- DM=dN+(0.6 to 1.5) 2tM, and
- TM=(1.0 to 2.5)tM,
- wherein the parts to be joined include an upper part and a die-side part,
- wherein dN is an shank outer diameter of the rivet shank of the punch rivet and tM is a thickness of a die-side part to be joined, and
- the die is structured so that for parts to be joined that are made of materials of lower deformability than that of the deformable materials:
- DM≦2.2dN, and
- TM≦0.15DM, and
- wherein the die is structured and arranged to allow the punch rivet to punch through the upper part while providing a radial thickness of the die-side part and creating an undercut in the die-side part,
- wherein at least one of:
- a rivet foot of the punch rivet comprises at least one outwardly curved section having a radius;
- and
- a cylindrical circumferential face of the die comprises the die diameter DM.
A die for the production of a punch rivet connection between an upper part and a die-side part via a punch rivet comprising:
- a die cavity delimited by a die floor and a cylindrical circumferential face;
- and
- a central depression having a predetermined depth and being formed in the die floor that is structured and arranged as a pressure relief during a joining process,
- wherein the die is structured and arranged to allow the punch rivet to punch through the upper part while providing a radial thickness of the die-side part and creating an undercut in the die-side part.
A die for connecting first and second parts via a punch rivet, comprising:
- a die cavity delimited by a die floor and a cylindrical circumferential face;
- and
- a central depression formed in the die floor that is structured and arranged to provide pressure relief during connection via the punch rivet,
- wherein the die is structured and arranged to allow the punch rivet to punch through the first part and expand radially while providing a radial thickness of the second part and creating an undercut in the second part.
Dependencies are inferred from the claim text.