Patent ID: 9505048
Filing Date: 2016-11-29
CPC Classification: B21D

Claim Text:
1. A hydroforming mold, comprising: a lower die holder, comprising a groove base, wherein the groove base comprises a bottom plane and two side planes adjoining the bottom plane; a lower die, disposed on the bottom plane, wherein a lower mold cavity for receiving a pipe blank is provided on a top portion of the lower die; a pair of upper dies, respectively clamped on the top portion of the lower die and capable of moving along the top portion of the lower die, wherein a bottom portion of each upper die is provided with an upper mold cavity, and an inward slope is formed on a side of each upper mold cavity opposite to the other upper die; a back pressure die, disposed between the two upper dies and comprising a frame and two pressing portions, wherein the frame has a guide rod parallel to an axial direction of the pipe blank, each pressing portion is provided with a guide hole, the guide hole is sleeved on the guide rod so that the two pressing portions move relative to the frame, and bottom surfaces of the two pressing portions lean against a surface of the pipe blank; an upper die holder, covered on the lower die holder to prevent the pair of upper dies from moving away from the lower die, wherein a window is provided on a position of the upper die holder corresponding to the back pressure die, so as to form a space that allows the back pressure die to move away from the lower die; and a pair of axial feed push rod assemblies, respectively sealed with an end portion of the pipe blank and the pair of upper dies, wherein the pair of axial feed push rod assemblies has a runner for introducing fluid into the pipe blank, and axially pushes the pair of upper dies to move close to each other.