我厂加工的内燃机干式铸铁气缸套(图1),其支承肩厚4_(-0.090)~(-0.120)mm,工艺安排在C620车床上一次车削到成形尺寸,由于C620车床上的刀夹为单刀夹,所以必须做一种特殊的90°弯刀,安装在方刀架的水平位置上,另一把普通车刀安装在方刀架的垂直位置上,两 The internal combustion engine dry cast iron cylinder liner machined by our factory (Fig. 1) has a bearing shoulder thickness of 4 mm (-0.090) to (-0.120) mm. The process is arranged on a turning of the C620 lathe to a forming size. Since the tool holder on the C620 lathe As a single tool holder, so you must do a special 90 ° machete, mounted on the level of the square knife holder, the other ordinary knife mounted on the vertical position of the knife holder, two