摘要
复合高速钢轧辊外层采用卧式离心铸造,芯部采用重力铸造,成品在辊身上下段存在缩松缺陷。采用数值模拟方法计算轧辊外层卧式离心铸造和芯部重力铸造阶段的温度场变化、Niyama判据以及缩松和缩孔,分析主要工艺参数对全过程铸造充型及凝固过程的影响。结果表明,轧辊外层纵截面呈现由两端向中间的凝固顺序,外层横截面呈现由外向内的凝固顺序,转速的提高可以缩短外层凝固的时间;辊芯中心和上下辊身处容易出现缩松和缩孔。提高芯部重力浇注速度,可以实现从下往上的顺序凝固,获得高质量的复合高速钢轧辊。最后,进行了复合轧辊实际生产验证。
The outer layer of a centrifugal casting compound high speed roll was formed by horizontal centrifugal casting and the core part was obtained by gravity casting.Shrinkage porosity was found in the upper and lower of the roller body in finished product.The temperature field changes,Niyama criterion,shrinkage porosity and shrinkage cavity during the stages of the horizontal centrifugal casting process for the outer-layer and the gravity casting process for the core part were calculated by using of numerical simulation method,and the effects of chief processing parameters on the whole mold filling and solidification processes were analyzed.The results showed that the solidifying sequence of the outer-layer longitudinal section was from the both ends to the middle,and that of the outer-layer cross-section was from the outer layer to the inner layer,and the increase of rotational rate might reduce the solidification time of the outer-layer;the shrinkage porosities and holes easily occurred in the upper and lower roll body and the center of the roll core.High-quality compound high speed roll can be obtained through increasing pouring rate of the gravity casting with sequential solidification from bottom to top.Finally,actual production verifications have been carried out.
作者
陈守东
王银
CHEN Shou-dong;WANG Yin(School of Mechanical Engineering,Tongling University,Tongling 244061,Anhui,China;Key Laboratory of Construction Hydraulic Robots of Anhui Higher Education Institutes,Tongling University,Tongling 244061,Anhui,China;Anhui Huanbowan High Speed Steel Mill Roll Co.,Ltd.,Technique Center,Tongling 244000,Anhui,China)
出处
《铸造》
CAS
北大核心
2022年第6期771-778,共8页
Foundry
基金
安徽省重点研究与开发计划项目(202004a05020011)。
关键词
复合轧辊
卧式离心铸造
重力铸造
充型与凝固
数值模拟
compound roll
horizontal centrifugal casting
gravity casting
mold filling and solidification
numerical simulation
