Metal working – Method of mechanical manufacture – Shaping by direct application of fluent pressure
Patent
1976-03-30
1978-08-29
Gilden, Leon
Metal working
Method of mechanical manufacture
Shaping by direct application of fluent pressure
29523, 72 62, 72 59, B23P 1700, B21D 905
Patent
active
041093658
ABSTRACT:
A method and apparatus for forming contoured tubular shapes, wherein the reshaping is accomplished without substantially changing the wall thickness of the tube material such that the strength of the resultant contoured shape is not effected. Forces are applied to an area of a tube in which the contour is to be changed. The forces are controlled so as to start reformation at one portion of the area and progress axially along the tube until the desired contour in that area is formed; that is to say, there is no incremental flowing increase (decrease) of tube diameter as the tube is contoured. No shaping forces are applied to the remainder of the tube (outside the area to be contoured); the tube material is thus free to move along its longitudinal axis relative to the area being contoured. This axial movement of the material forming the wall of the tube insures that there is substantially no change in wall thickness of the tube material through the area being contoured during the contour process. Therefore, hoop strength, immediately adjacent to a portion of the area undergoing contour change is maintained so that the tube material retains its strength in the area under linear tension.
REFERENCES:
patent: 616764 (1898-12-01), Bourke
patent: 1041406 (1912-10-01), Baucroth
patent: 2603175 (1952-07-01), Wurzburger
patent: 2742873 (1956-04-01), Moore
patent: 2965961 (1960-12-01), Schindler
patent: 3148940 (1964-09-01), Kojac
patent: 3520163 (1970-07-01), Otoda
patent: 3670545 (1972-06-01), Kent
Eastman Kodak Company
Gilden Leon
Kessler Lawrence P.
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