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    異型管無芯棒輥擠成型過程擠壓力公式的建立

    Establishment of Calculation Formula of Extrusion Force During Non-mandrel/Roll-extrusion Forming Operation for Shaped Seamless Steel Tubes

    • 摘要: 異型管無芯棒輥擠成型是一種生產(chǎn)高精度異型管的新技術(shù)。該成型方式的特點(diǎn)是力能消耗少、制品表面質(zhì)量好,且施力形式為推力。該成型是在三向壓應(yīng)力的狀態(tài)下完成的,變形過程中管子在長度方向上的延伸受到限制,管角部充填性能好,可以獲得最小的各邊相接處的外半徑R值和更高的加工精度,特別適用于生產(chǎn)大直徑厚壁或小型薄壁精密異型管。介紹了使用主應(yīng)力法建立異型管無芯棒輥擠成型過程擠壓力的計(jì)算公式。

       

      Abstract: As a new technique for manufacture of high-precision shaped seamless steel tubes, the non-mandrel/ rollextrusion forming process features low energy consumption, fine surface quality and pushing force in terms of force-applying way. Witht this process, tube formation is completed under a condition of three-directional pressure-stress, resulting in longitudinally restriction of elongation of the tube, good corner filling and minimum outer radius value R at the joint points between the sides as well as mush higher processing accuracy, and being. particularly applicable for manufacture of large-sized, heavy-wall or small-sized thin-wall precision shaped seamless steel tubes. Also described in the article is how to use the main stress method to establish the calculation formula for extrusion force applied to during non-mandrel/ roll-extrusion process of shaped seamless steel tubes

       

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