Research On Dynamic Characteristics Of Drum Rolllathe And The Design Of Controlsystem

Functional surfaces with microstructures have a specific topology, and specificphysical, chemical and optical properties of materials can be transformed by modifyingthe microstructured surfaces. Due to these particular functions, microstructured surfaceshave been widely applied in the field of optical system, concentrated photovoltaics,display device, drag reduction film, traffic signs, etc. Roll-to-Roll ultra-precisionreplication process is one of the mainstream technologies which can manufacturemicrostructured surfaces by a high-precision, high-efficiency, low-cost way. Thisprocessing method is to adopt roll die with ultra-precision microstructures to replicatemicrostructures on target surface, and eventually the high-precision functionalmicro-structured surfaces are obtained with subsequent treatment process. Hence, thedevelopment of ultra-precision machining equipment for roll die has become the keyelement to this processing method. Due to the large weight and aspect ratio of roll dieand high efficiency and high precision manufacturing, the control system of thismachine tool and dynamic performance need to meet the higher requirements. Therefore,the research of dynamic characteristics of drum roll lathe and the design of controlsystem have great significance.The design and integration of open CNC system based on UMAC controller iscompleted first in this paper. In the design phase of CNC system, the features ofultra-precision drum roll machine tool is fully taken into account, including hardwareselection, interface circuit design, electronic control design. Moreover, the controlsoftware of drum roll lathe is completed.Drum roll lathe is a weak stiffness system, and this problem is mainly manifestedin the workpiece and spindle system. Guideway system has two linear guideways withorthogonal and top and bottom form, and this structure can ensure that the tool moveswithin dimensional plane. When Z-axis guideway operates with large acceleration ordeceleration, X-axis which is in the top of Z-axis will generate oscillation, our subjectfirst obtain the modal of machine tool and guideway system by the finite elementmethod, providing a reference for design of the control system. Furthermore, this papercarried out transient dynamic analysis on the machine model in order to explore howZ-axis linear motor shock impact on spindle system, X-axis and tool, and then study onthe law of the oscillation of components.For the above resonance phenomenon of guideway system, this paper propose asolution for this problem that setting Notch filter in the CNC is used to reduce thesystem amplitude frequency characteristic around resonant frequency and weaken theresonance, and the system performance will be improved. We establish a mathematicalmodel of Z-axis and verify the effectiveness of notch filter for resonance with MATLAB simulation.