Metal working – Means to assemble or disassemble – Means to drive self-piercing work part
Patent
1991-09-23
1994-04-26
Rosenbaum, Mark
Metal working
Means to assemble or disassemble
Means to drive self-piercing work part
2924353, 292835, 294322, 29521, B23P 1900, B23P 1100, B21D 3900
Patent
active
053055179
ABSTRACT:
A series of related clinch joints as well as methods and apparatus for forming these joints are disclosed. All of the leak proof drawings are capable of being fabricated using a solid non-radially expandable die having a recessed cavity formed therein for cooperation with a corresponding punch having a solid punch projection. The clearance between the punch and the die recess are specifically sized relative to the material thickness to achieve optimum fastening characteristics. Several joint embodiments utilize variable clearance between the punch and the die to minimize strength variability resulting from changing material thickness. Alternative lance type and leak proof joints utilize a variable clearance between the punch and the die to achieve both high, shear and peel strength in a single joint design.
REFERENCES:
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patent: 5208974 (1993-05-01), Sawdon et al.
SAE Technical Paper, A New Mechanical Joining Technique for Steel Compared to Spot Welding, J. M. Sawhill and S. E. Sawdon, Not 83018, 1983.
Hughes S. Thomas
Rosenbaum Mark
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