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在介绍数控系统中几种常用的通讯方式的基础上，结合管材弯曲加工的工艺特点，提出了管材加工柔性单元数控系统的前后台式和分级分布式两种控制结构。
Based on the introduction of several commonly used communication methods in numerical control system and combining with the process characteristics of pipe bending, two control structures of front and rear desktop and graded distributed control of flexible CNC system for pipe material processing are proposed.