Method for molding bicycle tube
OwnerChan Shen Loinventor
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Abstract
This invention relates to a method for molding a bicycle tube and the method comprises the following steps: first, providing a tube and then controlling thickness of the tube by a drawing and extruding process for forming a molding portion. Second, plasticize other portions of the tube into particular diameters and shapes by plasticizing processes. Third, hydroform the molding portion of the tube by a mold and a hydroforming device for forming particular three-dimensional shapes. By applying to the above-mentioned method, the tube could be molded into a three-dimensional, unique and delicate shape.
Claims14
A method for molding a bicycle tube comprising the steps of:
- providing a tube;
- controlling thickness of said tube by a drawing and extruding process;
- plasticizing said tube into particular diameters and shapes by plasticizing processes;
- and
- hydroforming a selected portion of said tube by a hydroforming device and a mold defining a mold cavity comprising large portions and narrow portions for forming particular three-dimensional shapes, the step of hydroforming said selected portion of said tube comprises the steps of:
- placing said selected portion of said tube into said mold;
- injecting pressurized liquid into said tube by said hydroforming device so that said tube is filled with the pressurized liquid;
- sealing said tube except the communication of the pressurized liquid;
- pressurizing said pressurized liquid to mold said selected portion of said tube into large portions corresponding to said large portions of said mold cavity;
- and
- further pressurizing said pressurized liquid to mold said selected portion of said tube into narrow portions corresponding to said narrow portions of said mold cavity.
Dependencies are inferred from the claim text.