A pass planning method for multi-hit stretching of heavy forgings by integration of a semi-analytical technique and degrees-reduced finite element

Cui, Zhenshan; Chen, Wen; Sui, Dashan; Liu, Juan
May 2013
AIP Conference Proceedings;May2013, Vol. 1532 Issue 1, p581
Academic Journal
A pass planning method for multi-pass and multi-hit stretching of heavy forgings is proposed, which composes of a semi-analytical procedure and a degrees-reduced finite element code. The semi-analytical procedure is based on a kinematically admissible velocity and Markov variational principle, and can be applied to roughly calculate the deformed shape and working force for stretch forging process for work-piece which has vertical and lateral symmetrical lines in cross-section. Meanwhile, in order to obtain the distributions of metal flow, temperature, strain and stress in detail, a degrees-reduced thermo-mechanical coupled rigid finite element code is developed. In this code, the instantaneous deformation zone is specially extracted from the total domain and simulated for metal flow, while the total domain is used to simulate the evolution of thermal field. Taking the semi-analytical method as a solver, the pass planning procedure for stretch forging is developed, and the degrees-reduced finite element code is used as a supplement to check the rationality of the planed pass schedule. An example is implemented to demonstrate the application of the proposed technique.


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