Elucidation of thermal oxidative decomposition of foamed pattern in evaporatibe pattern casting and verification by in-situ observation of molten metal flow

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04742
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26060:Metals production and resources production-related
• Research Institution: Kansai University
• Principal Investigator: Maruyama Toru 関西大学, 化学生命工学部, 教授 (80330174)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 消失模型鋳造 / 鋳鉄 / スチレン / 熱分解 / 湯流れ

Outline of Final Research Achievements

To clarify the influence of combustion and explosion of foamed patterns on the occurrence of "residual defects" and "misrun and molten metal spouting " in evaporative pattern casting, experiments to replace the gas inside the foamed pattern with an inert gas and to measure mold filling rate of molten cast iron using the pattern.
By holding the foamed pattern in an inert gas atmosphere for a certain period of time after holding the foamed pattern in a reduced pressure atmosphere for a certain period of time was efficient to replace the gas inside the foamed pattern.Using the foamed pattern with the gas replaced with inert gas, the pattern decomposition rate was faster than without replacement, and the molten metal flow rate tended to be slower. The molten metal flow length was longer even slower flow rate, making it clear that replacing the inside of the foamed pattern with an inert gas is effective in suppressing misrun.

Free Research Field

金属生産工学

Academic Significance and Societal Importance of the Research Achievements

発泡模型内のガスを不活性ガスで置換することにより、発泡模型の熱分解速度が増加したことから、学術的な意義として、発泡模型の分解において熱酸化分解の影響が明確になった点が挙げられる。
不活性ガスで置換した模型を用いると湯回り不良を抑制できることが明らかとなったことから、社会的な意義として、消失模型鋳造法の普及率向上に寄与すると考えられる。本鋳造法の普及率が向上することによって、鋳物砂の廃棄量低減やそれに伴うCO2排出削減が期待される。さらに、鋳物の軽量化が期待され、それによって製造の省資源・省エネルギーにも寄与することが考えられる。