Method for joining thermoplastic parts

Details Method for joining thermoplastic parts Method for joining thermoplastic parts

1989-08-28

1991-03-05

Wityshyn, Michael G.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 92, 156294, B29C 6506

Patent

active

049975005

ABSTRACT:
A technique for permanently joining thermoplastic parts in a single stroke converts kinetic energy into thermal energy. In this technique, one of the thermoplastic parts includes a linear shaft while the other includes a cavity having the same general shape but being slightly smaller in its cross-section. The thermoplastic parts are permanently joined when the shaft is thrust into the cavity at a velocity that exceeds a predetermined minimum value which is a function of the thermoplastic materials used and the relative dimensions of the shaft and cavity. An interference fit between the shaft and cavity causes frictional heat to be generated which melts the contacting surfaces and thus welds the parts together after a brief cooling period.

REFERENCES:
patent: 2942748 (1960-06-01), Anderson
patent: 3184353 (1965-05-01), Balamuth et al.
patent: 3444018 (1969-05-01), Hewitt
patent: 4152185 (1979-05-01), Tessenske
SAE Technical Paper Series, No. 860581, "Welding Plastics for the Automotive Industry," Martin N. Watson 2/24-28/86.
Machine Design, "1987 Fastening, Joining & Assembly Reference Issue", pp. 44-48, Nov. 19, 1987.

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