Composite tube and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2016151818-A1
Application number	US-201514955115-A
Country	US
Kind code	A1
Filing date	Dec 1, 2015
Priority date	Dec 2, 2014
Publication date	Jun 2, 2016
Grant date	—

Abstract

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,

First claim

What is claimed is:

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.

2 . The composite tube manufacturing method according to claim 1 , wherein
the step of pushing the billet to a to-be-extruded position comprises: placing the billet in a billet container, and pushing the billet to the to-be-extruded position by using an extrusion stem; and the extrusion process comprises the following step: extruding the billet by using the extrusion stem, so that the billet is extruded to the composite tube according to a sectional shape of an outlet of an extrusion die.

3 . The composite tube manufacturing method according to claim 1 , wherein the step of pushing the billet to a to-be-extruded position comprises: placing the billet in a billet container, and pushing the billet to the to-be-extruded position by using an extrusion stem.

4 . 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; and bending the composite tube by using residual heat left after extrusion, so that a bent composite tube has a pre-determined curvature; wherein the composite tube has a thicker part and a thinner part, the thicker part is adaptable to a tension action during bending, and the thinner part is adaptable to a compression action during bending.

5 . The composite tube manufacturing method according to claim 4 , wherein
the step of pushing the billet to a to-be-extruded position comprises: placing the billet in a billet container, and pushing the billet to the to-be-extruded position by using an extrusion stem; and the extrusion process comprises the following step: extruding the billet by using the extrusion stem, so that the billet is extruded to the composite tube according to a sectional shape of an outlet of an extrusion die.

6 . The composite tube manufacturing method according to claim 4 , wherein
the step of pushing the billet to a to-be-extruded position comprises: placing the billet in a billet container, and pushing the billet to the to-be-extruded position by using an extrusion stem; and 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.

7 . A composite tube, comprising:
an inner tube; and an outer tube, located outside the inner tube, and bonded to the inner tube through an extrusion process; wherein under force of 5000 psi, a damping capacity of the inner tube made of the magnesium alloy is 25 times higher than that of the outer tube made of the aluminum alloy, and a tensile strength value of the outer tube made of the aluminum alloy is greater than 390 MPa.

8 . The composite tube according to claim 7 , wherein a difference value between melting points of the inner tube and the outer tube is less than 200° C.

9 . The composite tube according to claim 7 , wherein the inner tube and the outer tube are made of a magnesium alloy and an aluminum alloy respectively, or the inner tube and the outer tube are made of a magnesium alloy and a titanium alloy respectively.

Assignees

• Metal Ind Res & Dev Ct

Inventors

• Shao Shun-Yu

Classifications

• F16L9/02

  of metal (F16L9/16 - F16L9/22 take precedence) · CPC title

• B21C35/023

  Work treatment directly following extrusion, e.g. further deformation or surface treatment  (B21C35/03 takes precedence; gas treatment B21C23/009) · CPC title

• B21C25/02

  Dies · CPC title

• B21C23/22 Primary

  Making metal-coated products; Making products from two or more metals · CPC title

• B21C23/12

  Extruding bent tubes or rods · CPC title