航空薄壁框类零件铣削加工表面质量研究

刀具-薄壁深腔框类零件是一个弱刚性系统,在铣削力作用下,刀具及框类零件的薄壁结构发生挠曲,出现欠切与过切,从而使加工厚度产生偏差,严重影响工件加工精度和表面质量.首先介绍铣削力的计算方法,在此基础上研究刀具弯曲、壁板挠曲对加工表面质量的影响.采用有限元法依次计算任意加工点处刀具及壁板的刚度,推导铣削薄壁框类零件时厚度偏差的计算,提出极限铣削力概念.通过数值算例,研究减小加工偏差的方法,提高航空薄壁零件加工精度.

Study on milling surface quality of the aerospace thin-walled parts

Tool-thin wall deep cavity box parts is a weak stiffness system,deflection of the cutter and box-type thin-walled structures occurred under the action of the milling force,appear due to cut and cut off,so that process thicknesses error,seriously affect the accuracy and surface quality of workpiece.First introduced the cutting force calculation method,based on this study of tool bending and wall deflection impact on surface quality.Using finite element,compute in turn the stiffness of the tool and the wall at any milling point,derive the thickness deviation calculation method,proposed the concept of cutting force limit.By reducing the processing of numerical examples study of error methods to improve aerospace thin-walled precision parts.