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异型管无芯棒辊挤成型是一种生产高精度异型管的新技术。该成型方式的特点是力能消耗少、制品表面质量好，且施力形式为推力。该成型是在三向压应力的状态下完成的，变形过程中管子在长度方向上的延伸受到限制，管角部充填性能好，可以获得最小的各边相接处的外半径Ｒ值和更高的加工精度，特别适用于生产大直径厚壁或小型薄壁精密异型管。介绍了使用主应力法建立异型管无芯棒辊挤成型过程挤压力的计算公式。
Profiled tube coreless roll extrusion is a new technology to produce high-precision shaped tubes. The molding method is characterized by less power consumption, product surface quality, and the force of the form of thrust. The forming is carried out under the condition of three-direction compressive stress, the extension of the pipe in the length direction during the deformation is limited, and the fillet filling performance of the pipe corner is good, and the minimum outer radius R value at the connection of each edge and more High processing accuracy, especially for the production of large-diameter thick-walled or small thin-walled precision tube. The formula for calculating the squeezing force of non-core rod roll forming process of profiled pipe by principal stress method is introduced.