摘要
CRH380中心销是高速列车向架的关键铸件,射线探伤要达到一级标准,要求有先进的铸造工艺做保证,为此必须对铸造工艺进行优化。首先采用华铸CAE软件对初步设计的铸造工艺进行模拟,而后选择最佳工艺方案进行浇注实验,对铸件毛坯进行射线探伤、正十字解剖检查内部质量。结果表明,对于CRH380中心销铸件,采用单侧进水、热节处放置顶冒口的传统浇注工艺方案,浇注过程中卷气易在铸件中形成气孔,只在热节处安放冒口时在平板处易形成缩松;将铸件中部的中空锥体铸成实体,使热结集中并向平板方向移动,强制造成顺序凝固的条件,而后采用只设顶冒口浇注工艺方案,则除锥体心部外有少量的缩松外,其他部分没有缩松、缩孔、夹杂等缺陷,射线探伤评定为一级。铸造过程数值模拟结果与实际铸造结果基本吻合。
CRH380 centrepin is the key casting piece for the high-speed strain bogie, and its ray detection must be of the first-level standard. In order to meet this demand, the advanced casting process is demanded. The objective of this paper is to optimize the casting process. At first, the HZCAE Software was adopted to simulate the casting process preliminary designed, then the optimum process program was chosen to proceed the pouring experiment. After that the castings quantity was checked through the ray detection and positive cross anatomy. The results show that the pores are easily formed in the casting by the gas involved during the pouring process and the shrinkage porosities are easily formed at the position of plane plate if the traditional pouring process which includes unilaterally watering and putting the top riser at hot resers is used. If the hollow cone of the casting center portion is casted into entity, and the hot resers are focused and moved toward the plane plate direction, in that way, the progressive solidification is constrainedly formed, then pouring process of only installing the top riser is taken, there aren’t shrinkage porosities, shrinkage cavities, inclusions and other defects in the casting, except for a small amount of shrinkage porosities existed outside of cone core, and the ray detection is assessed as the first-level. The numberical simulation results of the casting process are basically consistent with the actual casting results.
出处
《辽宁工业大学学报（自然科学版）》
2014年第6期390-393,共4页
Journal of Liaoning University of Technology(Natural Science Edition)
关键词
铸造过程数值模拟
铸造工艺优化
铸造缺陷
casting process in numerical simulation
casting process optimization
casting defect
