Sheet bending principle people <br>in the metal manufacturing, with most of the bending plate bending machine. A core folding apparatus are upper and lower molds. <br>The tool (the mold) have a "V" shaped cross section (v notch type); the tool (upper mold) having a mating wedge or an angle cross section. Placed between two sheets, which wedge down into "V" -shaped groove, formed curved.
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