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      • Dry Metal Forming Using CO₂ as Volatile Media Injected through Die

        L. H. Cai(채려홍),J. W. Kang(강지원),S. T. Hong(홍성태) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.5월

        Abound of lubricating oil is used in sheet metal forming. A new green technology to prevent a large quantity of waste lubricating oil is dry metal forming. While coating technology is a popular approach for dry metal forming to protect environment and save time, high strength workpiece may lead to tool coating failure during manufacturing process. As an alternative to dry metal forming, volatile media could be utilized to reduce friction in contact zone and ensure product quality. CO2/SUB> as volatile media is famous for phase change, which volume after evaporation separates tools and workpiece. A flat die with microholes for a flat strip drawing tribometer is designed by 3D printing technology to evaluate the performance of CO2/SUB> as a volatile lubricant. Flat strip drawing tribometer is used to simulate draw force against normal force during sliding process. The result shows that CO2/SUB> pressure and microholes have a significant effect on friction performance.

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