叶轮铸件铸造工艺的优化

作者:李朝东;李栋;孟庆文; 刊名:现代铸铁 上传者:王守祥

【摘要】介绍了叶轮铸件的结构及技术要求,针对原工艺砂芯断裂和变形引起的铸件尺寸超差报废问题,提出了改进措施:(1)将原工艺的平做平浇方式改为平做立浇方式,避免叶片砂芯受到金属液的巨大浮力,有利于浇注过程中产生的气体和夹杂物上浮,使夹杂物进入铸件顶端的冒口或者溢出;(2)提高砂芯自身的强度,使砂芯抗拉强度≥1.6 MPa。生产结果显示:铸件清理后表面光洁,无裂纹、夹渣等缺陷,符合外观质量要求;铸件壁厚均匀,未发生变形,铸件尺寸完全符合规范要求。

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2019 / 2 现代铸铁 叶轮铸件铸造工艺的优化 李朝东,李 栋,孟庆文 (共享智能铸造产业创新中心有限公司,宁夏 银川 750021) 摘要:介绍了叶轮铸件的结构及技术要求,针对原工艺砂芯断裂和变形引起的铸件尺寸超差报废问题,提出了改进措施:(1)将原工艺的平做平浇方式改为平做立浇方式,避免叶片砂芯受到金属液的巨大浮力,有利于浇注过程中产生的气体和夹杂物上浮,使夹杂物进入铸件顶端的冒口或者溢出;(2)提高砂芯自身的强度,使砂芯抗拉强度≥1.6 MPa。生产结果显示:铸件清理后表面光洁,无裂纹、夹渣等缺陷,符合外观质量要求;铸件壁厚均匀,未发生变形,铸件尺寸完全符合规范要求。 关键词:灰铸铁;叶轮;铸造工艺 中图分类号:TG250 文献标识码: B 文章编号:1003-8345(2019) 02-0047-04 DOI:10.3969/j.issn.1003-8345.2019.02.013 Optimization of Casting Process for Impeller Castings LI Chao-dong,LI Dong,MENG Qing-wen (National Intelligent Foundry Innovation Center Co.,Ltd.,Yinchuan 750021,China) Abstract:The structure and technical requirements of impeller castings were introduced. The improvement measures for the oversize of castings caused by the fracture and deformation of the original core were proposed:(1)The flattening made and flatten pouring method of the original process was changed to flattening made and vertical pouring. That prevented the blade sand core from being subjected by huge buoyancy of the molten metal,which was favorable for the gas and inclusions generated during the pouring process to float. And that also made inclusions entered the rwaser or overflow of the top of the casting.(2)Increased the strength of the sand core itself,and made tensile strength above 1.6 MPa. The production results show that the surface of the casting was clean without cracks,slag inclusions and other defects. That was in line with the appearance quality requirements. The casting wall thickness was uniform,wi

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