IJPEM

Study on Folding Defect Elimination Method of Track Link Forging Based on Preforming Design

Guangchun Wang/Shandong University

Keywords: Folding defect Preforming design method Die cavity shrinkage Track link
A high percentage of folding defects were more easily introduced into the outer area of the sleeve hole during the mass production of track link forgings. In this study, it could be found that the folding defects were induced by the end-surface quality of the billet with the streamline characterization and the points tracking simulation. A defect elimination method based on the preforming design was proposed according to the numerical simulation and the experiment. The outer wall of the sleeve hole in the die cavity was shrunk inwards a certain distance to extrude the surface defects of the billet into the flash during the pre-forging. And then, the original flat shape punching wad of the sleeve hole was designed as an oblate-frustum of a cone shape to compensate the shortage of the material volume. The shrinkage range and the justified height of the oblate-frustum preform were recommended by the numerical simulation. As a result, the experiments showed that the proposed preforming design method completely eliminated the folding defects of the track link forgings.