Method for forming a joint in a stack of light metal alloy sheets
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United States of America Patent
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Apr 19, 2016
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N/A
app pub date -
Nov 9, 2011
filing date -
Nov 11, 2010
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Abstract
A self-piercing rivet (10) for forming joints in stacked sheets of high or low strength, light alloy metals such as aluminum and magnesium. The rivet (10) comprises a head (11) and a substantially cylindrical shank (12) that is at least partially hollow so as to define a bore (13) that extends along at least part of its length. The outside diameter (D1) of the shank (12) is at least 6 mm, the effective length of the rivet is at least 1.3 times the diameter of the shank and the bore (13) has a volume that is at least 38% of the effective solid volume of the rivet (10). The rivet geometry is such that it has enhanced column strength to withstand the high insertion forces required and a high bore volume to accommodate displaced sheet material.
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