Device for processing arc and slope at root of deep inner hole in lathe

The invention discloses a device for processing an arc and a slope at a root of a deep inner hole in a lathe. The device comprises a main body (2), a knife box (3) and a support ring (4), which are assembled together from right to left in sequence and are coaxial, and a copying lathe tool (5), wherein a clamping part (2-0) connected to a lathe carriage is arranged at the right side of the main body, the axial length from the left end of the clamping part of the main body to the left end of the knife box is equal to or greater than the depth of the processed deep inner hole, the copying lathe tool comprises a lathe tool body (5-0) and a tool bit (5-1), wherein the shape and the size of the part, which is positioned at the outer end of the lathe tool body, of the tool bit are the same as the shapes and the sizes of the arc and the slope at the root of the processed deep inner hole, the lathe tool body (5-0) of the copying lathe tool is axially vertical to the knife box (3) and is adjustably assembled at the inn