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首页> 外文期刊>The tube & pipe journal >IRONING THE WRINKLES OUT OF COPPER TUBING--How a wiper die lowers the compressive forces during bending
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IRONING THE WRINKLES OUT OF COPPER TUBING--How a wiper die lowers the compressive forces during bending

机译:从铜管中烫除皱纹-雨刮模在弯曲过程中如何降低压缩力

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摘要

THE majority of copper tube bending never comes close to producing wrinkles on the inside of a bend, but now and then the design of a tubular part makes it prone to wrinkling in the bend zone. If the bend radius is small enough, the wall is thin enough, or both, a wiper die may be necessary to prevent any wrinkles that develop. The way in which a wipe die does this is most interesting. Simply put, as a tube transitions from a straight section to a bent section, it undergoes compressive stresses on the inside of the bend. When these compressive stresses exceed a certain limit, the inside wall may buckle. The result is a protrusion that forms away from the wiper die and toward the outside wall of the tube (because the material takes the path of least resistance). A wiper die is used to help offset or limit these compressive stresses in an attempt to make a wrinkle-free bend. So the question is, How exactly does a wiper die limit the compressive stresses when attempting a tight-radius bend?
机译:大多数铜管弯曲永远不会接近在弯曲的内部产生皱纹,但是管状零件的设计有时会使其在弯曲区域易于起皱。如果弯曲半径足够小,或者壁足够薄,或者两者都薄,则可能需要使用刮水模以防止产生任何皱纹。擦拭模具执行此操作的方式最为有趣。简而言之,当管子从笔直的部分过渡到弯曲的部分时,它会在弯曲的内部承受压缩应力。当这些压应力超过一定极限时,内壁可能会弯曲。结果是形成一个突起,该突起远离雨刮器模头并朝着管子的外壁形成(因为材料采用的阻力最小)。刮水器模头用于帮助抵消或限制这些压应力,以尝试形成无皱折的弯曲。因此,问题是,在尝试进行小半径弯曲时,刮水片模具如何精确地限制压缩应力?

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