四刃镗刀头具有带纵向槽2的圆柱形刀体1(图a),纵向槽内装有镶可换刀片4和导向件的同样刀座(图b)。当切削件或导向件完全磨损时,可在刀座内将其更换,而且为了重调刀具,可将切削件和导向件装配好后再进行重磨。镗孔过程中,镗刀可借助导向件沿已加工部份定位,这样可保证在加工过程中具有较高的径向刚性。镗刀具有四个切削件可利用分段 The four-edge boring head has a cylindrical body 1 with a longitudinal groove 2 (Fig. A). The longitudinal groove is provided with the same seat (Fig. B) with the insert 4 and the guide. When the part or the guide is completely worn out, it can be replaced in the seat, and for the purpose of repurposing the tool, the part and the guide can be assembled and refurbished. During boring, the boring tool can be positioned along the machined part by means of the guide, thus ensuring a high radial rigidity during machining. Boring tool with four cutting parts available segments