GCr15铸环热辗扩孔洞形状演变预测模型研究  

Research on void shape evolution predictive model during hot ring rolling of as-cast GCr15 ring

作　　者：钱东升[1,2] 姚摇 郭俊[1,2] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070 [2]武汉理工大学现代汽车零部件技术湖北省重点实验室,湖北武汉430070

出　　处：《塑性工程学报》2017年第1期168-173,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51135007);教育部创新团队发展计划项目(IRT13087);湖北省重大科技创新计划项目(2015AAA005)

摘　　要：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。Casting-ring rolling composite forming of rings is a short-ring forming new technology for hot ring rolling ring parts by using ascast ring billet. However,the casting ring exists slag,shrinkage defects,which affect the quality of the final ring. Based on ABAQUS platform,three-dimensional thermal mechanical coupling model of hot rolling for GCr15 casting ring void was established and the model reliability was confirmed by hot rolling experiment. Then the mechanism of void deformation rules for as-cast GCr15 ring in different radial positions during hot rolling was studied and a void shape predictive model was established. The simulation results show that the size change of the void in each direction is closely related to the position of void; the closer the void to the inner diameter,the faster the size change of void; according to the initial geometry of the ring,the hot rolling relevant process parameters and initial void size,the void closing degree in the hot rolling process can be predicted.

关 键 词：GCr15铸环 铸环孔洞 热辗扩 预测模型 

分 类 号：TG335.11[金属学及工艺—金属压力加工]