| 摘要 |
There is provided a cold folding method for a hollow tube of magnesium material. The method has the steps of: providing an inner rib at opposite sides of a hollow square tube made of magnesium material, accommodating the square tube, having opposed ends received in the upper portion guide member of the female mold, in an inner portion of the lower portion protection member of the male mold, and lowering the male mold to fold the square tube by the combination of the curved surface portion of the male mold and the curved surface of the female mold.
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