| 摘要 |
PURPOSE: Bending dies are provided which bends the material in various curvatures without replacement of dies when bending a material the cross section of which is circular such as a round bar or pipe, and reduces diameter variation or distortion of the material. CONSTITUTION: The bending dies comprises a moving part which is coupled to the upper part of the bending dies so that the moving part is ascended or descended by external force; a fixing part which is clamped to the moving part to fix position of a material(220) having the circular cross section; and a bending part which is coupled to the lower upper surface functioning as a support of the bending dies, and which fixes position of the fixing part so that the bending part bends the material(220) as the bending part is being contacted with the material that is descended, wherein the moving part comprises a punch(110) having front and rear surfaces which are spaced apart from each other in a certain distance, a rectangular first mounting hole(112) is formed in a length direction of the front and rear surfaces, the fixing part comprises a first upper roller(120), a pad(130) and a second upper roller(140), and the bending part comprises a die adaptor(200), first and second dies(160,170) and first and second lower rollers(180,190).
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