Spring blank, machining tool, and machining process

The invention discloses a spring blank, wherein the section of the spring blank is circular, a carbon fiber mandrel pre-buried in the spring material is arranged along the center of the circular section, and the surface of the spring blank is sleeved with a carbon fiber sleeve layer. The machining tool comprises a ceramic forming pipe with one end provided with a conical opening. A carbon fiber guide tube, coaxial with the ceramic forming tube, is arranged at the large-end-distance opening end of the conical opening of the ceramic forming tube; a wire-releasing disc of the carbon fiber wires is arranged in front of the other opening end of the carbon fiber wire guide pipe; a spring blank cooling mechanism and a traction mechanism of the carbon fiber wires are arranged at the other end of the ceramic forming pipe, and the tool for machining the carbon fiber sleeve layer comprises a sleeve and a sleeve traction mechanism. The machining process comprises the steps that the wire-releasingdisc of the carbon fiber