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525755 
Journal Article 
MECHANISM OF UNEQUAL DEFORMATION DURING LARGE-SCALE COMPLEX INTEGRAL COMPONENT ISOTHERMAL LOCAL LOADING FORMING 
Sun, ZC; Yang, H 
2008 
601-608 
English 
Isothermal local loading forming of large scale complex integral component is a complicated process with coupling effects of multi-fields and multi-factors. The local loading mode leads to alternation between loading and unloading zones and further complicated unequal plastic deformation, which may lead to forming defect and will affect the forming process and quality. To ascertain the mechanism of unequal deformation and to open out the influences of local loading parameters on the unequal deformation and process are the key problems to be resolved. Based on DEFORM3D platform, FE models for the isothermal local loading forming of large-scale complex integral component have been established, and key technologies for modeling have been dealt with properly. Then, combined with theoretical analysis, the mechanism of unequal deformation and effects of partition of loading zone, transition zone and boundary constraint are investigated. The results show that proper partition of loading zone can reduce the forming load effectively, and make the shift of the unloading region keep in an acceptable range, while it has negligible effect on the die cavity filling property and forming quality. The rational setting of the overlapping region could eliminate the bulge of unload region effectively, and could also reduce the shift of unloading region. The boundary constraint has some effect on bugle and the shift of unloading region. 
Unequal deformation; large scale complex integral component; isothermal; local loading forming; numerical simulation