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US 11,717,870 B2Granted
Continuous method for producing capillaries made of nonferrous alloys
AssigneeFeinrohren S.P.A.
InventorMark Pasotti
Life of this patent
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Abstract
A method for producing capillaries from nonferrous alloys, in particular of Al, which includes the continuous cold rotary extrusion of a blank having a solid cross-section, obtained by casting, in order to produce a tube having a hollow cross-section. The deformation of the blank to be extruded is achieved only by using friction force. The method further includes at least one step of cold drawing of the extruded tube in order to reduce its diameter to the diameters corresponding to a capillary.
Claims5
A method for producing capillaries from nonferrous alloys, the method including the following steps:
- a continuous cold rotary extrusion of an initial blank having a solid cross-section, produced by casting, in order to obtain a tube having a hollow cross-section, wherein a deformation of the blank to be extruded is achieved only by friction force, a cooling of the extruded tube to ambient temperature, and at least one step of cold drawing of the extruded tube in order to reduce a diameter thereof to diameters corresponding to a capillary, and a plurality of steps of cold drawing performed in succession until an inside diameter of the capillary in the range from 0.2 mm to 4.5 mm and a length of the capillary exceeding 10,000 mm with substantially constant inner diameters are obtained, wherein the initial blank is a wire rod with an initial external diameter of 9.5 mm-15 mm.
Dependencies are inferred from the claim text.