Control System Transformation And Implementation Of CNC Machining Center

With the progress of machine industry and technology, according to the actual need of the production, upgrading of machine tools has become a new economic growth industry, based on whole or partial structure upgrading to existing machine, we can improve the technical performance indicators. In this thesis, based on MANDELLI CNC machining center of Shenyang Blower Works Group Co.Ltd as the object of study carries on the upgrade. The CNC machining center has been in use for nearly two decades, some aspects has been aging and wear, such as electrical,machinery,etc. and the control system is also fall behindrelatively, resulting in a heavily failure rate and parking rate, it has influenced the quality and progress of three dimensional impeller.Under the above background, we have made the following rehabilitation programs after analyzing the original machine’s technical status.(1) We selected the current advanced Siemens840D CNC system to replace the original system to improve the machine stability after considering the electrical control features, the machining operation features, price and other factors of MANDELLI CNC machining center;(2) We used the611D CNC system AC servo drive units which is compatible with the840D system, the1FT6AC servo motor which has high-precision, low inertiaand high-resolution position feedback and the1PH7induction motors which hashigh-power and high-response instead of the original analog DC drive and DC motor to ensure the shaft power and torque and achieve free maintenance of motor;(3) Making a new operation station, allocating a CNC panel, CNC keyboard and control panel.This thesis selected the Siemens840D CNC system as a control device, chosen each module’s model number matching with840D, made the machine electrical diagrams and developed PLC software program. In the end, the various parameters of the machine was set up, the lathe was checked andaccepted after completing the mechanical parts and digital servo system debugging. Theresults show that the performance and accuracy meet or exceed the original machine,fully meet the requirement of high precision, high efficiency and high reliability to three dimensional impeller, and the total cost is a quarter of the price of imported equipment in the same grade.