Method and apparatus for joining thermoplastic parts

Details Method and apparatus for joining thermoplastic parts Method and apparatus for joining thermoplastic parts

B - Operations, Transporting

29

C

18/971

B29C 65/06 (2006.01) B29C 65/00 (2006.01) B29C 65/56 (2006.01) B29C 65/60 (2006.01)

Patent

CA 2020245

Abstract of the Disclosure 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 thethermoplastic 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. - 11 -

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