Method for tracking metal particle flowing on cross section of special rolling piece based on finite element

The invention discloses a method for tracking the metal particle flowing on the cross section of a special rolling piece based on a finite element. The method comprises the following steps of extracting a curve surface of middle space of the rolling piece in the length direction after a special rolling pass; generating a finite element model of blank rolled by a next section groove by taking multiple facets of the curve surface as a section of a body element; comparing the generated blank rolled by the next section groove with a curve coordinate extracted after the blank is rolled by the next section groove by adopting programming software, and transmitting temperature to a next finite element model; repeating re-meshing of the blank of each rolling pass in each special rolling pass; extracting a curve of certain middle space from the blank to the length direction of the rolling piece in the last rolling pass, and realizing the position tracking of all metal particles during a whole rolling process. According to the method disclosed by the invention, the position tracking of all metal particles on the cross section of a complicated rolling piece during the whole rolling process can be realized, and a theoretical basis is provided for correct design of the section groove, seeking of finished product defects and reasonable distribution of metal.