一、前言 摩托车消声器里的网孔段是一圆筒形薄壁零件(见图1),材料为20号钢,材料厚度为1mm,其圆周上均布直径为2mm的孔466个。零件的展开尺寸为105×58mm。(见图1中展开图)。我厂在加工这种零件 I. Introduction Motorcycle muffler in the mesh section is a thin-walled cylindrical parts (see Figure 1), the material for the 20 steel, the material thickness of 1mm, the circumference of the uniform diameter of 2mm 466 holes. Parts of the expansion size of 105 × 58mm. (See the expanded view in Figure 1). I plant processing of such parts