OCC熱模連續鑄造法研究與應用

熱模連續鑄造法（Ohno Continuous Casting,簡稱OCC技術），實現具方向凝固組織的連續製程。　　將鑄模加熱到熔體的凝固溫度以上可避免熔體在模壁上形核，使熔體的凝固只在脫離鑄模的瞬間進行。隨著鑄錠不斷離開鑄模，使熔體的凝固方向沿熱流的反方向進行。這種方法最大的特點是不對鑄模進行強制冷卻，而是將其加熱至高於被鑄金屬的液相線溫度以上，並通過模外對鑄錠直接噴水冷卻，使熱量沿拉鑄方向由鑄模出口向冷卻區散熱。金屬與鑄模保持液態接觸，在鑄模出口端液態金屬靠表面張力維持形狀並在連續拉出過程中逐漸凝固。製程中減小鑄錠與模壁的摩擦，易獲得表面光亮、複雜截面形狀的鑄錠；且沿拉引方向單向凝固，補縮效果良好，凝固過程中易於將氣體及夾雜物排除，從而獲得純凈緻密的鑄材。　　本研究著重於銅金屬棒材製程研發，棒徑可達ψ6.0 mm，單晶長度可達1 m。且提升銅材純度，建立生產單晶的技術。由於晶界在音頻信號傳輸中相當於許多串聯的電容，對信號的傳輸引起歪曲和衰減的作用，因此製程創造極高的應用價值。另外配合成品的生產，鑄材後續的加工處理，包括伸線工程及熱處理製程，亦進行技術研發。在過程中不論工程設計或製程試驗也有所突破與發展，最終實現產品的價值化和產業化。

關鍵字

熱模連續鑄造；銅；加熱鑄模

並列摘要

Heated mold continuous casting (Ohno Continuous Casting, referred to as the OCC technology) technique appears to solidify the melting into the single crystalline rod by the continuous casting, making the method promising to be widely used for application. Using the method, the mold is heated up to the melting temperature of the ingot to avoid nucleation and solidification of the melting alloy within the mold, and the melting ingot only solidify right at the moment of the melting being pulled out. The solidification of the melting is along the reverse direction of heat flow when the melting metal continue leaving the mold. The greatest feature of this approach is not to force cooling the mold, but to heat the mold to above the ingot liquidus temperature. Cooling the pulling cast alloy through the mold, so the heat transfer along the direction of the pull-casting mold to the cooling zone. To maintain the contact between the liquid metal and the mold, the existence of surface tension of liquid metal at the mold keeps the shape of pulling casting and then gradually solidified. The surface brightness of the pulling alloy would be significantly enhanced and a complex cross-sectional shape of the ingot could be obtained by reducing the friction between the ingot and the die. By pulling along the unidirectional, the solidification process is easy to avoid the formation of gas inclusion and to obtain a pure dense casting metal. This research focuses on the process development of single crystalline copper metal rods, and the rod has a dimension up to 6.0 mm in diameter and the grain size up to 1 meter in length. By using this technique, the quality of the single crystal copper rod can be enhanced, and thus making the process can be used for mass production. Because grain boundaries in the audio interconnection affect series capacitance, the signal distortion, and attenuation during signal transfer. The process is creating a very promising application. By incorporating subsequent processing, such as drawing and post-annealing, the method has attracted a great amount of interests in research and mass production. The result of this study is very useful for industry, and the process will increase the value of the related production.

並列關鍵字

Ohno Continuous Casting ； copper ； heated mold

參考文獻

3. Ohno, A., Motegi, T. (1977). Formation Mechanism of Equiaxed Crystals Zones in Cast Metals. AFS International Cast Metal Journal, Mar, 28-36.

4. Ohon, A. (1986). Continuous Casting of Single Crystal Ingots by the OCC Process. Journal of Metals, Jan, 14-16.

20. Sawada, K., Nakai, Y., Shiraishi, H., Nakano, T., Matsushita, Y., and Oshima, M. (1987). Development of a Continuous Casting Single Crystal Copper Conductor. Sumitomodenki, 131, 110-113.

26. Kim, Y. J., & Kou, S. (1988). An Experimental Study on Process Variables in Crystal Growth by Ohno Continuous Casting. Metallurgical and Materials Transactions A, 19, 1849-1852.

27. Wang, Y. H., Kim, Y. J., and Kou, S. (1988). Thermal Measurement and Computer Modeling of Heat and Fluid Flow in Crystal Growth by Ohno Continuous Casting. Journal of Crystal Growth, 91, 50-56.

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OCC熱模連續鑄造法研究與應用

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