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<p>Resin-bonded sand is widely utilized in molding and core making during sand casting. The organic binders within the sand mold undergo pyrolysis upon direct contact with high-temperature molten metal during casting, leading to the formation of some casting defects related to sand mold and sand core. In order to clarify the specific mechanism of this process, it is necessary to explore the changes in the resin itself and its resin-bonded sand at high temperatures. In this article, sample preparation and storage conditions are controlled to match actual foundry conditions for the following analyses: The pyrolysis process of three types of resin-bonded sand during actual casting production is analyzed through thermal analysis, revealing different reaction stages and products during the heating process for different resins. Additionally, the compressive strengths of the three kinds of resin-bonded sand are directly measured at different resin contents and temperatures varied from 500 to 900 °C, enabling the establishment of a correlation between macro-level strength changes and internal resin pyrolysis. This study holds significant importance for better understanding the pyrolysis mechanism of resin and addressing casting defects related to the high-temperature mechanical properties of molds (cores).</p>

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Toward Understanding of the No-bake Resin Pyrolysis Mechanism during Sand Casting Process

  • 期刊论文

  • 发表日期：

    2025年5月17日

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  • Xin Peng,
  • Yuyang Qi,
  • Zhenwei Liu,
  • Peng Wan,
  • Wen Li,
  • Xu Shen,
  • Xiaoyuan Ji,
  • Yajun Yin,
  • Yuancai Li,
  • Jianxin Zhou

摘要

Resin-bonded sand is widely utilized in molding and core making during sand casting. The organic binders within the sand mold undergo pyrolysis upon direct contact with high-temperature molten metal during casting, leading to the formation of some casting defects related to sand mold and sand core. In order to clarify the specific mechanism of this process, it is necessary to explore the changes in the resin itself and its resin-bonded sand at high temperatures. In this article, sample preparation and storage conditions are controlled to match actual foundry conditions for the following analyses: The pyrolysis process of three types of resin-bonded sand during actual casting production is analyzed through thermal analysis, revealing different reaction stages and products during the heating process for different resins. Additionally, the compressive strengths of the three kinds of resin-bonded sand are directly measured at different resin contents and temperatures varied from 500 to 900 °C, enabling the establishment of a correlation between macro-level strength changes and internal resin pyrolysis. This study holds significant importance for better understanding the pyrolysis mechanism of resin and addressing casting defects related to the high-temperature mechanical properties of molds (cores).