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. 19, 1987
Filed:
Jun. 19, 1985
Bernard Plaquin, Aulnoye, FR;
Louis Fradin, Aulnoye, FR;
Vallourec, Paris, FR;
Abstract
The invention concerns a process for machining a joint element for steel tubes, intended in particular for the petroleum industry, containing a truncated surface (2) and at least one screw stop. One first carries out final machining of a truncated surface (2) that contains the element (1) and premachining of the screw stop or stops of this element; one applies on said truncated surface (2) a collar (11) of the same conicity as that of this surface, installed so as to rotate and move axially relative to the spindle (3) that carries the machining tool or tools (5) of the screw stop or stops; at the same time as one imparts to the joint element (1) a rotary movement relative to said spindle (3), one causes relative axial movement of the tool holder spindle (3) and the joint element so as to carry out final machining of the screw stop or stops of the joint element until the conical collar (11) applied on said truncated surface (2) represents a stop that opposes final relative axial movement of the tool holder spindle relative to the machined element.