某钛合金泵体特种砂型铸造工艺分析及优化  

Analysis and Optimization of Special Sand Casting Process for a Titanium Alloy Pump Body

作　　者：马静 王林春 张元光 崔新鹏 李峰 MA Jing;WANG Lin-chun;ZHANG Yuan-guang;CUI Xin-peng;LI Feng(Biamtec Material Co.,Ltd.,Beijing 100095,China;Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology,Beijing 100095,China)

机构地区：[1]北京航空材料研究院股份有限公司,北京100095 [2]北京市先进钛合金精密成形工程技术研究中心,北京100095

出　　处：《铸造》2024年第9期1304-1310,共7页Foundry

基　　金：国家重点研发计划项目(2020YFB1710100)。

摘　　要：泵体是石油化工领域常用的零部件,在其铸造生产过程中,泵体的底部法兰有蜗型双流道一侧的位置和法兰盘带有凸起的位置存在大的缩孔,热压后出现大压坑,严重影响铸件质量。本文基于Procast软件建立泵体铸造成形仿真模型,分析泵体在不同的铸造方案下的缺陷位置和大小,优化了浇注系统。模拟研究表明,在泵体下法兰设置石墨冷铁进行激冷,有效解决了下法兰大缩孔的问题,缩孔大小由55 cm^(3)减小到1.44 cm^(3),整体减小了97.4%。结合建立的有限元模型,采用正交试验和响应曲面对工艺参数进行优化,模型预测的最佳工艺条件为:初始浇注温度为1770℃,初始浇注半径为37.7 mm,浇注时间为5.1 s,此时泵体的缩孔总大小为1.421 cm^(3)。建模计算与响应曲面模型预测值对比,误差为0.63%,验证了响应曲面模型的可靠性,可为后续实际生产提供指导。Pump body is a common part in the field of petrochemical industry.In the casting process,there are large shrinkages in the bottom flange of the pump body at one side of the spiral double runner and the flange with a convex position,and large pressure pits appear after hot pressing,which seriously affects the quality of the casting.Based on Procast software,this paper established a simulation model for the casting of the pump body,analyzed the location and size of the defects of the pump body under different casting schemes,and optimized the pouring system.The simulation study showed that the problem of large shrinkages in the pump body was effectively solved by setting graphite cold iron on the lower flange for freezing,and the shrinkages reduced from 55 cm^(3) to 1.44 cm^(3).The overall decrease was 97.4%.Combined with the established finite element model,orthogonal test and response surface were used to optimize the process parameters.The optimal process conditions predicted by the model were that the initial pouring temperature was 1770℃,the initial pouring radius was 39.9 mm,the pouring time was 5.1 s,and the total shrinkage size of the pump body was 1.421 cm^(3).Compared with the predicted value of the response surface model,the error is 0.63%,which verifies the reliability of the response surface model and can provide guidance for the subsequent practical production.

关 键 词：PROCAST 精密铸造 钛合金 数值模拟 缩孔 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG242.3[金属学及工艺—金属材料]