Design Of Progressive Addition Lenses Processing Machine Tool And Reseach Of Virtual Prototyping

Presbyopia is the unavoidable physiological phenomenon for most of the elderly. As a new type of lenses for correction of presbyopia, progressive addition lenses are very helpful for improving the quality of old people’s life. Because the progressive addition lenses surface topography is complex and the size is small, processing is very difficult. To solve this problem, this paper designs a progressive addition lenses processing machine tool structure and key components, while establishing progressive addition lenses virtual machining system, analyzing the accuracy of the machine tool.Structure of the machine determines the processing methods, impacts processing quality of the lenses. By analyzing the progressive addition lenses processing requirements, planning progressive addition lenses processing machine functions, then put forward the progressive addition lenses processing overall machine design, machine tool and key components were anal yzed selection.Fast Tool Servo is a key component of machine, because the surface morphology of progressive addition lenses changes very much, it is necessary to designs the general structure of Fast Tool Servo. In addition, the voice coil motor generates a large amount of heat in the process of work, for this problems, this article analysis the heat that the voice coil motor generates, designs a type of heat shield to reduce the thermal deformation of the slider widget, so that the Fast Tool Servo designed to meet the machining of progressive addition lenses requirements.Good tool path is the premise to achieve progressive addition lenses processing. To explore progressive addition lenses processing trajectory, based on the principle of generating free-form surface tool path, while progressive addition lenses surface shape is very complex, this paper put forward a partial encryption tool path generation strategy, laid the theoretical foundation of the machine control program. This paper use Adams establish machine tool motion simulation software system that uses virtual processing methods fit the t heoretical model of progressive addition lenses, which proves the feasibility of the design of the new lenses processing machine.To predict the accuracy of the progressive addition lenses processing machine, this paper considers the machine tool feed system kinematics, dynamics and characteristics associated with rigid machine, sets up a complete virtual lenses processing system, enabling virtual manufacturing-based virtual machine progressive addition lenses. By comparing the surface parameters of the actual processing lenses with the theoretical lenses, the performance of the lenses processing machine tools is analyzed.