Transactions of Materials and Heat Treatment

Title：Research on forged billet of large cylinder based on hollow ingot

Authors： Tian Jihong Wan Zhiyuan Guo Fengwei Wang Qingxin

Unit： Taiyuan University of Science and Technology

KeyWords： hollow ingot numerical simulation mandrel reaming cavity closure

ClassificationCode：TG316.3

year,vol(issue):pagenumber：2015,40(2):15-21

Abstract：

The casting type defects of the hollow ingot exist mainly in the inner wall 1/3-1/2 of the hollow ingot and the unique solidification characteristics determine the huge difference between the forged billet and forging ingot. The deformation regulation of mandrel stretching in the hollow ingot was explored at different depressive ratios by Deform-3D numerical simulation software, and the hollow ingot internal defects were not improved easily through stretching. Based on the deformation regulation of mandrel reaming in the hollow ingot at different mandrel diameters and depressive ratios, it was more reasonable that mandrel diameter should be chosen with μ within 60%-75% and the depressive ratio within 25%-35%. The compaction effects of mandrel reaming on spherical, radial, axial and tangential cavity defects in the hollow ingot were explored. The results show that the mandrel reaming can close the spherical, tangential and axial hollow in the hollow ingot and compact the radial hollows significantly. Therefore, the reliability of using mandrel reaming as cogging step is validated.

Funds：

山西省自然科学基金资助项目（2013011022-3）；山西省研究生优秀创新项目（20123101）；山西省2013年国家级&省级大学生创新创业训练计划（201310109004，2013232）

田继红（1971-），男，硕士，副教授

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