Double -wall pipe expansion mould

The utility model discloses a double -wall pipe expansion mould, including mold housing and insert the mould inner core in locating mold housing, set up the perforation that runs through mould inner core head and the tail both ends and supply the double -wall pipe to pass on the mould inner core central axis direction, and this mould inner core is including pegging graft in proper order in the first inner core section of an organic whole, a plurality of second inner core section and third inner core section, mold housing central axis direction is last have been seted up and has supplied mouldinner core male through hole, mold housing lateral surface both ends set up respectively communicate to the through hole if unwatering pumping vacuum mouth, and set up cooling water inlet and the coolant outlet that communicates respectively to the through hole at this mold housing lateral surface. The utility model provides a double -wall pipe expansion mould expands the size of a dimension thatbecome to need with the do