锻压技术

基于空心钢锭大型筒体锻件开坯锻造研究

英文标题：Research on forged billet of large cylinder based on hollow ingot

作者：田继红万志远郭丰伟王庆辛

单位：太原科技大学

分类号：TG316.3

出版年,卷(期):页码：2015,40(2):15-21

摘要：

空心钢锭的铸态缺陷主要存在于距空心钢锭内壁1/3～1/2处，其独特的凝固特点决定其开坯锻造和实心钢锭有很大区别。通过Deform-3D数值模拟软件，探究空心钢锭在不同压下率下的芯轴拔长变形规律，得到拔长不利于改善空心钢锭内部缺陷。研究空心钢锭在不同芯轴直径、不同压下率下的芯轴扩孔变形规律，得出芯轴直径的选择应保持μ在60%～75%范围内、压下率处于25%～35%较为合理。探究芯轴扩孔对空心钢锭球形、径向、轴向、切向空洞型缺陷的压实效果，结果表明：芯轴扩孔可以闭合空心钢锭中的球形、切向和轴向空洞，对径向空洞有明显的压实作用，验证了采用芯轴扩孔作为开坯工步的可靠性。

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.

基金项目：

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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