Research And Development Of Composite Boring And Milling CNC System Based On PMAC

Composite boring and milling machining center is a kind of CNC machine toolswith complete functions. Its processing efficiency is5to10times of ordinary NCmachine tools, and it has been widely used in various mechanical processing industry.With the rapid development of manufacturing, CNC system appears a lot prominentproblems, which gradually cannot meet the demand of the market. In order to solvesuch problems, this paper puts forward an machining center NC system based onPMAC, its structure is "NC+PC" type, and has successfully applied in TX1600composite boring and milling machining center.In order to fully reflect the openness of the CNC system, sets up an" PMAC+IPC"double CPU hardware platform, PMAC takes charge of real-time control, such as:parameter setting, switch quantity control and feedback. IPC is responsible for nonreal-time control, such as: interface support, fault diagnosis, data management, realizesswitch of biaxial group and synchronous control of motors. At the same time, by customdefining G/M/T subroutines, compiles machine codes into processing languages whichPMAC can recognize. Using PEWIN32PRO writes tool changing PLC programs, buildsdouble automatic tool change system. Adopts full closed-loop "feedback+feedforward”compound control structure, studies PID algorithm, manual and automatic adjusts servoloop of the system. Finally, based on the environment of Windows XP, uses C#buildinghuman-machine interface, real-time feedbacks of the running state of the machine tool.By debugging on the laboratory furniture, it proves that this NC system is effectiveand stable, with high precision, strong real-time performance and scalability.