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在计算机控制光学表面成形(CCOS)技术中,由于边缘处压力分布的不均匀,会在工件边缘产生边缘效应,边缘效应会严重阻碍面形误差的收敛,边缘效应问题已成为数控加工技术中亟待解决的关键问题之一。针对边缘处压力阶跃分布模型和线性分布模型进行了理论仿真及实验验证,实验结果表明,对于方形工件,在露边量较大(实验中露边量为去除函数束径的1/3)和露边量较小(实验中露边量为去除函数束径的1/24)的情况下,两种模型得到的去除函数结果相差不大,都能够在一定程度上反映出实际结果;当露边量适中(实验中露边量为去除函数束径的1/6)时,线性模型下的去除函数更接近实验结果,阶跃模型在去除函数中心区域与实验结果偏离较大。
In Computer Controlled Optical Surface Forming (CCOS) technology, the edge effect is seriously hindered by the edge effect due to the uneven pressure distribution at the edge, and the edge effect has become an urgent problem in CNC machining technology One of the key issues to be solved. The theoretical simulation and experimental verification of the pressure step distribution model and the linear distribution model at the edge are carried out. The experimental results show that for the square workpiece, the amount of the exposed edge is larger (the amount of the exposed edge is 1/3 of the removed beam diameter in the experiment) (Less than 1/24 of the beam diameter in the experiment), the results of the removal function obtained by the two models show little difference, which can reflect the actual results to a certain extent. When When the amount of dew is moderate (the amount of dew in the experiment is 1/6 of the beam diameter), the removal function in the linear model is closer to the experimental result and the step model deviates from the experimental result in the center of the removal function.