Numerical control turning tool bar

The utility model discloses a numerical control turning tool bar which comprises a body, an oil plug and a screw, one side part of the body is cylindrical, the other side part of the body is cone-shaped, a rectangular full-length tool groove is arranged at the cone-shaped end and at the middle position of the body, and two spaced threaded holes a are arranged on one side of the tool groove and on the body; the screw is connected to the body through the threaded hole a, a threaded hole b is formed in the center inside the end of the cylindrical side of the body, and the oil plug is connected with the body through the threaded hole b. The body is of a variable structure, and the size and shape of a working part are calculated and determined according to the inner diameter of a numerical control lathe tool holder and the size and shape of an inner hole of a to-be-machined part. A cavity filled with cooling liquid is formed in the body and communicated with the oil plug. Various common and numerical control tools