基于铸辗复合成形工艺的Q235B环形铸坯

Q235B ring casting blank for cast-rolling forming technology

短流程铸辗复合成形工艺利用铸造环坯直接辗扩成形,具有节能、节材和缩短工艺流程等优点。在这种新工艺中,冶炼、铸造工艺对铸坯质量、组织、力学性能有很大的影响。以法兰常用的Q235B碳素钢为研究对象,设计了冶炼铸造工艺,应用ProCAST有限元分析软件对环件的砂型铸造工艺过程进行数值模拟,得到了铸坯不同位置的微观组织,并对缩孔缩松进行了预测;采用砂型铸造工艺对环件铸坯进行工业实验,分析了铸坯的显微组织和力学性能。结果表明,数值模拟结果与实验结果基本吻合;采用该铸造工艺得到的环件铸坯具有较好的力学性能,为后续辗扩工艺的顺利进行提供了有力保障。

A cast ring blank can he directly rolled into ring part by cast-rolling forming technology, which possesses many advan-tages such as saving energy, saving materials and shortening the process. In this new technology, smelting and casting processhave important influence on the quality, microstructure and mechanical properties of casting blank. In this paper, the smeltingand casting process were designed for Q235B carbon steel, which is often used to fabricate flange ring. The sand casting processwas simulated by use of ProCAST finite element analysis software, and the microstructure at different regions and the position ofshrinkage cavity in casting blank was predicted. Then, the commercial test was carried out by use of sand casting method, andthe microstructure and mechanical properties of cast blank were investigated. The results show that the numerical simulation resuhs are accordant with the experimental results. The ring casting blank obtained by sand casting has better mechanical proper-ties, which provides an effective guarantee for the successful implementation of the subsequent rolling process.