涡桨发动机第一、二级工作环是典型的薄壁环形阵,直径大,刚性极弱,技术要求高,加工困难(图1)。多年来,该零件在内径锥面φA 上车内螺纹(螺距1.0毫米,深0.7毫米,螺纹角45°,刀尖 R0.15毫米),并在内螺纹面上滚花(槽宽0.13毫米,深0.1毫米,间距1.0毫米)。这是为使石墨封严涂层结合牢固。但这样加工 The first and second stage of the turboprop engine is a typical thin-walled annular array, with large diameter, very weak rigidity, high technical requirements and difficult processing (Figure 1). For many years, the part had an internal thread (1.0 mm pitch, 0.7 mm deep, 45 ° thread angle, nose 0.15 mm) on the inner diameter taper surface φA and knurled on the female thread (groove width 0.13 mm, 0.1 mm deep, 1.0 mm pitch). This is to make the graphite seal coating firm. But this processing