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    Jiang Zhengyi, Jie Chunrong, Zhao Xiaodong. APPROACH TO UPPER-BOUND METHOD REGARDING DRAWING FORCE FOR SPIRAL INTERNAL-RIBBED PIPE COLD-DRAWING[J]. STEEL PIPE, 1991, 20(5): 41-47.
    Citation: Jiang Zhengyi, Jie Chunrong, Zhao Xiaodong. APPROACH TO UPPER-BOUND METHOD REGARDING DRAWING FORCE FOR SPIRAL INTERNAL-RIBBED PIPE COLD-DRAWING[J]. STEEL PIPE, 1991, 20(5): 41-47.
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    APPROACH TO UPPER-BOUND METHOD REGARDING DRAWING FORCE FOR SPIRAL INTERNAL-RIBBED PIPE COLD-DRAWING

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    • The formulas of drawing force for spiral internal-ribbed pipe cold-drawing are derived with upperbound method. The experiment result shows that the theoretical values are close to those measured, which provides a theoretical basis for internal-ribbed pipe cold-drawing equipment type selecting.
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