COMPOSITE TUBE AND MANUFACTURING METHOD THEREOF

摘要

A composite tube manufacturing method includes the following steps: providing a billet, wherein the billet includes an inner material and an outer material, and the inner material is enveloped in the outer material; heating the billet; pushing the billet to a to-be-extruded position; and performing an extrusion process, and extruding the billet to a composite tube, wherein the inner material and the outer material of the billet are respectively extruded to an inner tube and an outer tube of the composite tube, and the outer tube is bonded to the inner tube through the extrusion process,

主权项

1. A composite tube manufacturing method, comprising the following steps:
providing a billet, wherein the billet comprises an inner material and an outer material, and the inner material is enveloped in the outer material; heating the billet; pushing the billet to a to-be-extruded position; and performing an extrusion process, and extruding the billet to a composite tube, wherein the inner material and the outer material of the billet are respectively extruded to an inner tube and an outer tube of the composite tube, and the outer tube is bonded to the inner tube through the extrusion process; wherein the extrusion process comprises the following step: passing through an outlet of an extrusion die by at least one mandrel, so as to change an area of a section of the outlet of the extrusion die, so that the billet is extruded to the composite tube with different tube thickness, different inner diameters, or different outer diameters according to a changed sectional shape of the outlet of the extrusion die, wherein the at least one mandrel comprises first to fourth mandrels, the first and the third mandrels make the composite tube have different inner diameters, and the second and the fourth mandrels make the composite tube have different outer diameters.