| Microstructure with optical function is an important kind of microstructure,due to its special properties,it is extensively utilized in fields like imaging technology and energy applications,and has huge market application value.The roller machine tool control system,the kernel section of the entire machine tool,integrates multi-disciplinary expertise,and it has a immediate bearing on the processing of the CNC machine tool.Conventional roller machine tools are only equipped with X-axis,Z-axis and spindle,which cannot achieve radial Fresnel optical microstructure processing on the roller mold,and need to introduce A-axis for four-axis linkage to realize the processing of such structure.In order to study the implementation method of the control system for optical microstructure processing on roller mold,and to improve the R&D level and application capability of China's roller machine tool in the manufacturing industry,it has far-reaching sense in theory and practice to conduct research on the control system of roller machine tool based on optical microstructure processing.In this paper,the multi-axis linkage control system research is carried out on the existing roller machine tool in the laboratory for the requirements of optical microstructure processing,develops a stable,high-precision multi-axis linkage control system for roller machine tool,and realize the processing of naked-eye 3D optical microstructures and radial Fresnel optical microstructures.The specific research content is as follows:(1)Based on the optical microstructure machining process on roller mold and the mechanical structure of roller machine tool,the optical microstructure machining scheme was analyzed,and it was determined that two axis and four axis linkage control are needed for processing optical microstructure of naked-eye 3D and radial Fresnel lens,respectively.(2)The control system of roller machine tool including software and hardware platform was designed with Aerotech A3200 motion controller as its core,the hardware platform of the control system was built according to the overall design structure of the control system.The development of multi-functional modules for the upper computer software was achieved,the functional scalability,versatility and portability of the motion controller were effectively realized,and a multi-axis linkage control system of roller machine tool was developed for optical microstructure processing.(3)This paper searched the PID control algorithm of the A3200 motion controller,MATLAB/Simulink was used for parameter adjustment and simulation analysis of the PID servo control loop,and the optimal commissioning experiments were carried out in depth.The control system reached the requirements of high stability and high precision,the positioning accuracy of the rotary axis reached 2arc sec,and the positioning accuracy of the linear axis reached 0.25?m.(4)Conducted experiments of optical microstructure processing on roller mold based on the studied control system.On the basis of cutting the outer circle of the roller mold,a naked eye 3D optical microstructure with a columnar lens grating feature depth of 142.87?m and a radial Fresnel optical microstructure with a feature depth of 20 ?m per ring band were machined using different diamond tools.The processing results show that the surface roughness Ra of the outer circle processing experiment result of the roller mold is4.8nm,the average surface roughness Ra of naked-eye 3D optical microstructure is9.1nm,and the profile accuracy PV is higher than 4.5 ?m,the average surface roughness Ra of each ring of radial Fresnel optical microstructure is 8.4nm,and the profile accuracy PV is higher than 1.6 ?m,which verifies that the developed roller machine tool control system can meet the requirements of general optical microstructure processing performance. |
PDF Full Text Request