加工图1所示的箱体时,在专用机床上采用普通镗刀分粗精两工序加工孔φ72(?),表面粗糙度始终达不到设计要求,严重影响产品质量,后来采用如图2所示的刀具结构,箱体孔表面粗糙度达(?)。(▽7) 该刀具装在镗杆上,端面用盖压死,刀头装在刀体上,所以具有以下特点: 1、由于在专机制造过程中粗糙加工导向座不一定同步,也就是说,余量可能出现单边现象,这样,迫使精加工时要留1mm(直径方向)左右的余量,致使工件表面粗糙度质量 Machining the box shown in Figure 1, the special machine used ordinary boring knife points rough fine process two holes φ72 (?), The surface roughness has not reached the design requirements, seriously affecting the quality of the product, and then use Figure 2 The tool structure shown, box hole surface roughness (?). (▽ 7) The tool is mounted on the boring bar, the end face is crushed with a cap, the blade head mounted on the blade body, it has the following characteristics: 1, due to rough machining in the plane manufacturing guide base is not necessarily synchronous, that is , The margin may appear unilateral phenomenon, so that forcing finishing 1mm (diameter direction) left margin, resulting in the workpiece surface roughness quality