Nowadays, most of the computer-aided manufacturing technology considers cutter location path generation from the geometric view, but seldom considers the physical properties of processing resource in real machining, such as machine tool, fixtures, work piece, cutters, etc, and the reason for the high-quality process planning is fewer in production practice. Here the example given is process parameters analysis and design of NACA4412 Die-cavity; first, fittings airfoil section curve of NACA4412 based on data point of back and basin of blade, builds the 3D model of die-cavity of back blade; second, it analyses the metal removal rate and its applications in roughing process design;last, it inclines the work piece in fixture, and increases the diameter of the cutting tool and the effective cutting speed to obtain a higher finishing quality and processing efficiency.%现有的计算机辅助制造(Computer-aided manufacturing,CAM)技术大多只从几何角度考虑加工轨迹的生成,极少考虑实际加工时机床、夹具、工件、刀具等加工资源的物理特性,造成生产实践中高质量的工艺规划较少.以NACA4412翼型模具型腔数控工艺参数的分析与设计为例,首先基于叶背和叶盆数据点拟合NACA4412叶片翼剖面曲线,建立叶背模具型腔三维模型；其次分析金属去除率及其在粗加工工艺设计的应用；最后,将工件倾斜装夹,增大刀具直径和有效切削速度,获得较高的精加工质量和加工效率.
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