Determination of multi-direction loading path based on analytical method in forming of multi-cavity parts by considering folding defect

Abstract

In the forming of multi-cavity parts by multi-direction loading, the loading path greatly affects the material flow, the cavity filling, and folding defect generation, which is prone to occur and restricts the realization of forming process and guarantee of forming quality. How to determine the reasonable loading path related to part structures is urgent and of challenges. In this paper, the design principle of loading path is proposed, and aiming at the complex structures (different diameters and angles of main and branch pipes, different structures and dimensions) of the formed multi-cavity parts, the initial loading displacement of main punch is quickly determined by a new analytical method and further the overall reasonable loading path, where the volume transfer law and invariance principle are considered. The application in quick determination of loading path in 316LN stainless steel cross valve shows that the analytical method proposed in this paper is reliable and practical. Consequently, the method can provide a scientific basis for the quick determination of the reasonable loading path for diverse and complex multi-cavity parts.