METHOD FOR MANUFACTURING HOLLOW HYDRO-FORMED PRODUCT using MULTI-TUBE ASSEMBLY

摘要

A method for manufacturing a hollow hydro-formed product using a multi-tube assembly is provided, which comprises the steps of: (a) stably placing a multi-tube assembly in a Die, the hollow inner tube having fluid channel holes radially formed therethrough; (b) injecting fluid into the inner periphery of the inner tube; (c) applying fluid pressure to the inner periphery of the outer tube by the fluid while the fluid is discharged through the fluid channel holes of the inner tube; and (d) obtaining a formed product having an intended outer peripheral shape completed according to diameter-enlargement and plastic deformation of the outer tube. The inner periphery of the outer tube is pressed and hydro-formed by discharging the fluid through the fluid channel holes of the inner tube formed through the inner tube of the multi-tube assembly.

主权项

1. A method for manufacturing a hollow hydroformed product using a multi-tube assembly, the method comprising the steps of:
(a) loading a multi-tube assembly into a die, the multi-tube assembly including a hollow outer tube and a hollow inner tube inserted into the hollow outer tube, the hollow inner tube having a plurality of fluid channel holes radially formed on the inner peripheral surface thereof; (b) injecting fluid into the inner tube so as to be supplied to the inner periphery of the inner tube; (c) applying a hydraulic pressure of the fluid to the inner periphery of the outer tube while the fluid flows out of the inner tube through the fluid channel holes of the inner tube; and (d) subjecting the outer tube to bulging and plastic deformation to obtain a finally formed product having a desired outer peripheral shape.