Practical application of teaching materials for junior high school technology and melt processing by lost wax precision casting method using carbon dioxide mold(CO2 mold)

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K12386
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Science education
• Research Institution: Hiroshima University
• Principal Investigator: Tashima Shunzo 広島大学, 教育学研究科, 教授 (40136130)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 中学校技術 / 教材 / 金属加工 / 溶融加工 / 鋳造 / ロストワックス鋳造法 / 易融合金

Outline of Final Research Achievements

A carbon dioxide process (binder: water glass) is adopted as a mold of the lost wax casting method. We propose a casting method with high adaptability as a teaching material by combining Sn-Bi-Ag alloy (melting point 140 °C). In this process, dewaxing is possible by processing with a microwave oven for a few minutes, achieving a great improvement in terms of simplicity and safety. It is possible to carry out a series of steps of “model making→mold making→casting(pouring)→shake out (mold breaking)→finishing”, in a matter of hours. Furthermore, it is possible to produce a casting in free shapes three dimensionally. This process is currently being put into practical use together with teaching material manufacturers.

Free Research Field

金属加工教材の開発