Metal working – Method of mechanical manufacture – Electrical device making
Patent
1991-05-09
1992-04-28
Arbes, Carl J.
Metal working
Method of mechanical manufacture
Electrical device making
29424, 333239, H01P 1100
Patent
active
051075830
ABSTRACT:
The present invention relates to a method of manufacturing a two-part, thin-walled tubular element, particularly waveguides, to close tolerances. The inventive method comprises the steps of bending or pressing thin material in a manner to produce the parts (1, 2) of said element, wherein at least one of the parts (2) is provided with a shoulder-like projection (3) for joining said parts together; inserting the first part (1) into a first tool-half (4) which functions as a counter-pressure means and which has accurately determined internal dimensions; pressing the second part (2) together with the first part (1), wherein the formed element has a smaller vertical extension than the finished element; pressing a second tool-half (6) over the second part (2) and into abutment with the first tool-half (4), this second tool-half (6) functioning as a counter-pressure device and having accurately determined internal dimensions, wherein at least one of the tool-halves (6) is provided with means (7) which is operative in squeezing the join-forming surfaces of the element parts together into a lightly squeezed sealing connection; by introducing a foaming filler (8) into the assembled tool (4, 6) and between the element part (1, 2) and permitting the filler to expand so as to press the element parts outwardly against respective accurately-dimensioned tool-halves 4, 6); permitting the filler (8) to solidify to a core so that the element can be removed from the tool; sealing the lightly squeezed connection (3) to form a secure joint; and removing the foamed core from the finished tubular element.
REFERENCES:
patent: 3314130 (1967-04-01), Sheridan
patent: 3686590 (1972-08-01), Dischert
patent: 3955274 (1976-05-01), Imai et al.
patent: 4885839 (1989-12-01), Ben-Dov
Arbes Carl J.
Telefonaktiebolaget L M Ericsson
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