| The non-rotationally symmetric surface optical element has become the core component of optoelectronic information technology and optical communication technology with its superior optical performance and has been widely and widely used in many fields such as space exploration,aerospace,defense and people’s livelihood.Because the surface profile of the non-rotationally symmetric surface optical element is not symmetrical,the surface morphology is complex,the surface precision is high,the traditional surface processing technology such as LIGA technology,etching technology,laser Beam(electron beam)direct writing technology and other newly developed surface processing technology can not achieve non-rotational symmetric surface optical components high efficiency,high precision,high-volume processing.With the development of ultra precision diamond lathe and fast tool servo system,diamond tool turning technology based on fast tooling system has become a kind of high efficiency,high precision and high flexibility non-rotational symmetric surface optical element processing technology.Among them,the progressive lens surface is a typical non-rotational symmetric surface,it is a multi-focal length of the lens surface,different from the traditional reading glasses surface,progressive lens surface without the use of double-focus reading glasses when the eye must continue Switching to adapt to different focal lengths of fatigue,has become the best choice for presbyopia.However,the current progressive lens fitting time is long,expensive,to achieve its high efficiency,high precision,low price processing is an urgent problem to be solved.In order to realize the processing of progressive lens surface elements,this thesis designs a FTS device according to the given performance requirements.Through the analysis of the motion parameters of the FTS device design process,especially its acceleration,the bandwidth design of the FTS device is completed according to the progressive lens surface shape,and the FTS device travel is determined according to the depth of the progressive lens surface.In order to ensure the processing accuracy of the progressive lens surface,the design of the FTS device has a large bandwidth,that is,a higher frequency response,due to the different height of the lens surface height difference,to mm level,the design of the FYS device should have more Big work trip.And the cutting force and cutting angle change in the process are analyzed,and the layout form of the FTS device and the selection of the guiding mechanism,the driving device and the sensor are completed according to the analysis result.According to the structural layout and component selection of FTS device,the main components are as follows: structural design and finite element analysis of air hydrostatic guide and diamond tool turret,as well as design and parameter calculation of air flotation device.And according to the above analysis to complete the overall structure of the FTS device design and complete the drawing and parts processing,assembly,commissioning and circuit design,closed-loop control and control program preparation.According to the surface equation of the progressive lens surface,the geometric parameters of the diamond tool are selected.The data of the tool surface of the tool is calculated by MATLAB.The data points of the tool nose point are calculated by the equidistant point method.The equidistant point on the two-dimensional radial cross-sectional profile curve,and using the Hermite interpolation to complete the radius of the tool radius of the discrete data points.This thesis analyzes the influence of the FTS device on the accuracy of the tool error and the tool center high error on the precision of the progressive lens surface.In order to reduce the high error of the tool center of the FTS device,a high-rigidity,high-resolution precision lift is designed based on the spiral micro-head.Based on the above research,FTS device was used to complete the processing of progressive lens surface on the self-researched precision diamond lathe,and the processing results were analyzed and analyzed to verify the correctness of FTS device structure design and tool nose point motion trajectory planning. |
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