The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 1979
Filed:
Mar. 08, 1978
Alan F Haught, Glastonbury, CT (US);
David J McFarlin, Ellington, CT (US);
Richard F Dondero, South Meriden, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
An improved process for fabricating a sealing flange assembly useful for oval and other noncircular access ports in high vacuum equipment is disclosed. The process is applicable to sealing flange assemblies of the type which include relatively hard metallic flange members having opposed, mating surfaces at least a portion of which are chamfered to define a V-shaped notch therebetween and a relatively soft metallic sealing member disposed in the notch under compression against the chamfered surfaces. The process relates specifically to the machining of the chamfered sealing surfaces by a milling process which utilizes a specially ground end mill and selected depths of cut to provide a more or less grooved sealing surface profile essentially devoid of tool chatter marks and metal folds which represent nonsealable surface defects. The as-milled chamfered sealing surfaces are much coarser (32.mu. inch finish) than those produced by grinding (8.mu. inch finish) but nevertheless are effective in maintaining a vacuum tight condition in the assembly at a pressure level of 8.times.10.sup.-8 torr whereas the ground, finer finish sealing surfaces are not.