Self-piercing riveting with barrier layer
AssigneeMagnesium Products of America Inc.
InventorsYuchao Liu, Jonathan Patrick Weiler, Gerry Wang
Life of this patent
Estimating the term…
Abstract
A self-piercing riveting (SPR) system includes a top sheet and a bottom sheet. The top sheet is layered above the bottom sheet and are disposed between a die and a blank holder. The SPR system further includes a barrier disposed between the bottom sheet and the die, wherein the barrier is configured to reduce stress concentrations during formation of a joint between the top sheet and the bottom sheet. The barrier may has a thickness between 0.8 mm and 1.0 mm and is made from a cold formed or a dual phase steel alloy.
Claims15
A method for forming joints using self-piercing riveting (SPR), the method comprising:
- layering a first sheet atop a second sheet, wherein the first sheet and the second sheet are disposed between a die and a blank holder;
- placing a barrier between the second sheet and the die;
- driving, by a punch disposed within the blank holder, a rivet into each of the first sheet and the second sheet to form a joint therebetween;
- wherein the barrier is configured to reduce stress concentrations during formation of a joint between the top sheet and the bottom sheet;
- and
- removing the barrier from between the second sheet and the die, after driving the rivet into each of the first sheet and the second sheet.
Dependencies are inferred from the claim text.