Patent ID: 8435436

Claim:
A method for forming tail fin of wind turbine, comprising the following steps: a mold making step, in which a mold block is machined to form mold cavity corresponding to a contour of the tail fin, the mold block forming a sprue communicating the mold cavity; an injection molding step, in which a preset amount of molten plastic material is filled into the mold cavity through the sprue and the mold is subjected to rotation that induces a centrifugal force to make the molten plastic material uniformly sticking to an inside surface of the mold cavity to form a hollow shell; and a setting and mold release step, in which the plastic material of the shell is cooled and set and then the mold is opened to remove the shell out of the mold to provide a plastic molding of the tail fin; wherein a tail fin that is a one-piece three-dimensional, hollow and light-weighted configuration is obtained as a tail fin product of excellent aerodynamic performance; wherein the mold is composed of upper and lower mold blocks and wherein the tail fin so molded with the mold has a front end forming a coupling section and a rear end which comprises an erected primary fin member vertically mounted thereto and a secondary side fin member extending from each side of the primary fin member, the tail fin comprising a narrow section behind the coupling section, the narrow section having an outer contour that is continuously and smoothly jointed to the primary fin member and side fin members, the tail fin having a bottom which forms a smooth curved channel at a junction between the two side fin members.