Multi-domain Modeling And Simulation Of CNC Milling Machine

CNC milling machine is a typical mechatronic product, which is an organic compositionconsisted of different disciplines such as machine, electricity, and control.Traditionalmodeling and simulation for single disciplinary doesn’t take into account the couplingbetween disciplines, which restricted the improvement of the credibility in system modelingand simulation, and coupling simulation between the various disciplines is very complex.Therefore, in order to reduce workload and improve the quality of modeling and simulationon CNC milling machine, it is necessary to carry on efficient multi-domain modeling andinteractive simulation.In this paper, a CNC milling machine typed C000017B oriented for teaching andresearch is studied with object-oriented modeling method. Modelica language and itssimulation platform Dymola are used to model and simulate its mechanical subsystem,electrical subsystem and control subsystem，and main research work is done as follows：(1)The existing modeling and simulation methods are discussed, multi-domain unifiedmodeling language Modelica and simulation platform Dymola is chosen for modeling andsimulation of the CNC milling machine.(2)The CNC milling machine is disassembled according to disciplinary fields, andreusable component model libraries for mechanics, electronics and control are set up basedon Modelica and Dymola.(3)The driven motor models, including those of two phase hybrid stepper motor andbrushless DC motor, are set up by using the established libraries.The simulation results showthat the Modelica models are correct and reasonable.(4)Co-simulation of machine feed system with Dymola and Adams via Simulinkinterface is achieved, which provides a theoretical basis for matching mechanical andelectrical parameters of the machine tool, and expands the scope of Modelica application, andresults in collaborative applications of the multi-domain modeling and simulation platformwith other simulation tools.(5)Finally, the multi-domain models for the machine tool components are integrated intoa system, and simulation analysis of the integrated system is carried on, and verified via experiments.Simulation results show the feasibility of multi-domain unified modeling for the CNCmilling machine, which will contribute to the machine design and performance improvement.