Method of forming a large diameter extruded pipe
AssigneeRASP, Inc.
InventorsRichard D. Dresang, Peter W. Utecht
Life of this patent
Estimating the term…
Abstract
A self-aligning flange includes a flange member, a collar member and a stop member. An inner perimeter of the collar member is sized to receive an outer perimeter of a pipe. The flange member extends outward from an outer perimeter of the collar member. The stop member extends inward from the inner perimeter of the collar member. A large diameter extruded pipe includes a continuous cross section of at least six inches in diameter. It is preferable to weld a flange to one end of the large diameter extruded pipe. Immediately after the large diameter extruded pipe has been formed in an extrusion press, it is sprayed with a coolant to increase the surface hardness thereof.
Claims18
A method of forming a large diameter vacuum pipe, comprising the steps of:
- providing one of 6005 T-6 aluminum material, 6060 T-6 aluminum material and 6061 T-6 aluminum material;
- extruding a pipe from said aluminum material to provide a seamless tubular cross section, said pipe having an outer diameter of at least six inches;
- and
- providing said pipe with a wall thickness of less than 2.2% of an outer diameter thereof;
- and
- spraying said pipe with a coolant immediately after said extruded pipe is formed to provide a Rockwell “C” surface hardness of at least fourteen to resist at least one of denting and bending, said pipe being used for vacuuming in sewer cleaning applications.
A method of forming a large diameter vacuum pipe, comprising the steps of:
- providing one of 6005 T-6 aluminum material, 6060 T-6 aluminum material and 6061 T-6 aluminum material;
- extruding a pipe from said aluminum material to provide a seamless tubular cross section, said pipe having an outer diameter of at least six inches;
- and
- providing said pipe with a wall thickness between 0.070-0.13 inches;
- and
- spraying said pipe with a coolant immediately after said extruded pipe is formed to provide a Rockwell “C” surface hardness of at least fourteen to resist at least one of denting and bending, said pipe being used for vacuuming in sewer cleaning applications.
Dependencies are inferred from the claim text.