| 摘要 |
PURPOSE: A preparation method of a metal twin pipe is provided which has good intensity, may use for a long time, does not cause twisted phenomenon, and does not generate crack on the surface of the metal because welding and processing by a machine is not necessary. Also the metal twin pipe can obtain the beautiful appearance and metallic luster. CONSTITUTION: A metal twin pipe is prepared by the following steps: throwing planer metal plate(10) to roll forming machine and transferring in order; bending the metal plate from "S" shape to "8" shape through the mold roller of the multistage which is connected to the roll forming machine.
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