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球墨铸铁汽车转向节无缩松铸造工艺研究
Study on the Non-Shrinkage Casting of a Nodular Cast Iron Automobile Steering Knuckle
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- DOI:
- 作者:
- 刘培鑫 1 ，迟恩来 1 ，崔红保 2
LIU Peixin1 , CHI Enlai1 , CUI Hongbao2
- 作者单位:
- 1. 烟台鹏程汽车配件有限公司，山东 烟台 264000；2. 河南理工大学 材料科学与工程学院，河南 焦作 454000
1. Yantai Pengcheng Auto Parts Co., Ltd., Yantai 264000, China; 2. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
- 关键词:
- 球墨铸铁；转向节；共晶度；缩松
nodular iron; knuckle; eutectic degree; shrinkage porosity
- 摘要:
- 球墨铸铁汽车转向节是多热节铸件，且由于球铁糊状凝固的特性，导致铸件中经常出现缩松缩孔等缺陷，
故需增加冒口补缩，从而造成出品率下降和铸造工艺设计的复杂性等问题。 本文利用石墨化自膨胀对多热节的汽车转
向节进行补缩，通过精确测量铸铁热分析曲线，得到相关特征值参数，分析了不同共晶度和各种孕育组合方法对球铁转
向节的缩松影响。 结果表明，铁液共晶度调整到接近 1，且凝固温度曲线的共晶过冷度趋近于零时，利用碳化硅预处理、
喂丝孕育、浮硅孕育、倒包孕育及随流孕育可得到无冒口的健全无缩松球墨铸铁汽车转向节铸件，提高了出品率。
A nodular cast iron automobile steering knuckle is a multihot-spot casting. Due to the mushy solidification characteristics of nodular cast iron, defects such as shrinkage cavities and porosities often occur in casting, which requires an increase in riser feeding, resulting in a decline in the yield rate and the complexity of the casting process design. In this paper, graphitization expansion was fully utilized to feed an automobile steering knuckle with multiple hot pots. The thermal analysis curves of cast iron were measured to obtain the relevant parameters, and the effects of different eutectic degrees and various inoculation combinations on the shrinkage porosity of nodular iron steering knuckles were analyzed. The results show that non-shrinkage nodular cast iron automobile steering knuckle casting without riser can be obtained by adjusting the eutectic degree of molten iron close to 1 and eutectic undercooling degree of solidification temperature curve close to zero, and using silicon carbide pretreatment, wire feeding inoculation, floating silicon inoculation, ladle inoculation and flow inoculation, which significantly improves the yield rate.