Patent ID: 7467466

Claim:
A method for sealing a heat pipe, comprising the steps of: providing a metallic pipe with an end sealed and an opposite open portion; pressing the open portion of the pipe to form a two layer portion by using two pairs of pressing molds, wherein the two pairs of pressing molds comprise a pair of first pressing molds and a pair of second pressing molds adjacent to and under the first pressing molds, each of the first pressing molds has a flat contacting surface, and each of the second pressing molds comprises a flat contacting surface and a concave semi-conic contacting surface adjacent to and under the flat contacting surface of the each of the second pressing molds; welding an end part of the two layer portion to form a sealing structure, during which at least one pair of the pressing molds continues pressing the two layer portion; and moving the at least one pair of the pressing molds away from the sealing structure.