Eyelet and method of forming the same
AssigneeHilti Aktiengesellschaft
InventorArmin Herb
Life of this patent
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Abstract
A stack arrangement has a first plate-shaped workpiece (12), at least one another plate-shaped workpiece, and an eyelet (14; 34) that connects the first workpiece (12) and the at least one another workpiece (13), with material of the first workpiece (12) being drawn through a through-opening (15) in the at least one another workpiece (13), and with a rim (17) of the through-opening (15) of the at least one another workpiece (13) conically narrowing in a direction of the first workpiece (12).
Claims12
A stack arrangement (10) comprising a first plate-shaped workpiece (12);
- at least one another plate-shaped workpiece;
- and an eyelet (14;
- 34) for connecting the first workpiece (12) and the at least one another workpiece (13), wherein material of the first workpiece (12) is drawn through a through-opening (15) in the at least one another workpiece (13), and wherein a rim (17) of the through-opening (15) of the at least one another workpiece (13) conically narrows in a direction of the first workpiece (12).
A method of forming an eyelet for a stack arrangement (11) having a first plate-shaped workpiece (12) and at least one another workpiece (13) connectable by the eyelet (14;
- 34), the method comprising the steps of:
- embossing a fracture zone (22) in the at least one another workpiece (13);
- thereafter, forming with a piercing die (25), in a single movement, a through-opening (23) in the first workpiece (12) and a through-opening (15) in the at least one another workpiece (13), with the through-opening (23) in the first workpiece (12) having a cross-section smaller than a cross-section of the eyelet (14;
- 34) and with the through-opening (15) in the at least one another workpiece (13) having a cross-section greater than the cross-section of the eyelet (14;
- 34);
- and
- finally, drawing, with a plunging die (26) displaceable through the stack (10) substantially perpendicular thereto, material of the first workpiece (12) through the through-opening (15) in the at least one another workpiece (13).
Dependencies are inferred from the claim text.