Research on dedicated CNC system for flexible bending machining center based on EtherCAT communication and dual-CPU bus type

Allowing for the low cost, convenience, functional integration and customization, this paper designs and develops a dedicated CNC system for flexible bending machining center based on EtherACT communication and dual-CPU bus type. Firstly, by analyzing the forming principle of the 10 axis flexible bending machining center, a control mode of "PC + motion controller" based on the EtherCAT communication and dual CPU bus type is proposed, and the hardware of the CNC system is determined; Then, based on C# programming language, the software of the dedicated CNC system is completed, and the key problems such as positioning accuracy of sheet metal, bending control with springback and human-computer interface optimization are mainly solved; Finally, the machining test and experimental verification are carried out. The results show that the machining angle error range of the special CNC system developed in this paper is less than \pm 45', and straightness gap error is less than 0.3 mm, which meets GB/T 33644-2017 standard of sheet metal industry. Moreover, the human-computer interaction is friendly, the function integration is high, and the operation is stable, which can well meet the actual production needs.