The bed structure of high-grade large-scale CNC machine tools is crucial for maintaining their long-term service accuracy. This study focused on the key casting process of large nodular cast iron beds. AnyCasting software was employed to simulate and analyze the casting scheme, and then the mold filling and solidification processes were proposed based on the simulation results. The proposed casting scheme indicates that the designed gating system exhibited excellent filling capability. The dual sprue ceramic pipe bottom pouring technique, in conjunction with the chills, not only improved casting efficiency but also met the requirements of sequential solidification design. The castings possessed a dense microstructure characterized by uniform and stable phase composition, primarily comprising lamellar pearlite, with ≤0.5% of phosphorus eutectic and cementite. Furthermore, the microstructure of these materials displayed favorable graphite morphology with a spheroidization rate exceeding 85% and spheroidization grade of 2–3. This study has important academic and application value for the casting process of producing low-stress, high-grade CNC machine tool bed cast iron materials.

中文翻译：

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高档数控机床床身球墨铸铁关键铸造工艺研究

高档大型数控机床的床身结构对于保持其长期使用精度至关重要。本研究主要针对大型球墨铸铁床身的关键铸造工艺进行研究。采用AnyCasting软件对铸造方案进行模拟分析，并根据模拟结果提出充型和凝固工艺。所提出的铸造方案表明所设计的浇注系统表现出优异的填充能力。双浇口陶瓷管底浇注技术与冷铁配合，不仅提高了铸造效率，而且满足了顺序凝固设计的要求。铸件具有致密的显微组织，相组成均匀稳定，主要成分为片状珠光体，磷共晶和渗碳体含量≤0.5%。此外，这些材料的微观结构显示出良好的石墨形态，球化率超过85%，球化等级为2-3。该研究对于生产低应力、高档数控机床床身铸铁材料的铸造工艺具有重要的学术和应用价值。