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环件铸辗复合成形是利用铸造环坯热辗扩成形环件的一种短流程成形新工艺。然而铸造环坯中存在的夹杂、缩松、缩孔等孔洞类缺陷能影响到热辗扩成形环件的最终质量。基于ABAQUS平台建立了GCr15铸环孔洞热辗扩三维热力耦合模型,通过热轧实验验证了模型的可靠性,并研究了GCr15铸态环件不同径向位置孔洞缺陷在热辗过程中的演变规律,提出了一种铸环热辗过程中孔洞形状演变的预测模型。模拟结果表明,孔洞各向尺寸变化与孔洞位置密切相关,孔洞距离内径越近,其各向尺寸变化越大;根据初始铸坯的几何参数、相关热辗扩工艺参数和初始孔洞尺寸可以预测该孔洞在热辗扩过程中的形状演变情况。
Ring Casting Compounding is the use of casting ring blanking ring forming a new short-form forming process. However, defects such as inclusions, shrinkage and shrinkage cavities existing in the cast ring blank can affect the final quality of the hot-rolled forming ring. Based on the ABAQUS platform, a three-dimensional thermal coupling model of GCr15 casting ring hole was established. The reliability of the model was verified by hot rolling experiments. The evolution of holes in different radial positions of GCr15 cast ring during hot rolling was studied , Proposed a prediction model of the evolution of the hole shape during the hot ring rolling process. The simulation results show that the change of the hole size is closely related to the hole location. The closer the hole diameter to the hole, the bigger the change of the size is. According to the geometric parameters of the initial slab, the relevant parameters of the hot rolling process and the initial hole size can be predicted The shape evolution of holes during hot rolling.