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<p>This study investigates the influence of various process parameters on the quality of oxygen-free copper tubes produced by the Upcast process. Key factors such as the fit between the graphite die and inner tube (Δ<i>D</i>), immersion height of the graphite die into the melt, melt temperature, and water flow rate were analyzed using a comprehensive central composite experimental design. Results show that Δ<i>D</i>, interactions between immersion height and melt temperature, and water flow rate significantly impact the solidification front location (SFL), tensile strength, and grain size. An extremum point at 1160&#xa0;°C for melt temperature was identified, where SFL initially increases with temperature but decreases beyond this point. A tighter Δ<i>D</i> enhances tensile strength and alters grain size behavior. Optimal parameters for producing high-quality copper tubes were determined: Δ<i>D</i> of − 0.08&#xa0;mm, water flow rate of 47&#xa0;L/min, immersion height of 25&#xa0;cm, and melt temperature of 1161&#xa0;°C.</p>

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Mutual Influence of Parameters Affecting the Quality of Oxygen-Free Copper Tubes Produced by Upcast Process

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • Diba Javidi,
  • Ramin Raiszadeh,
  • Arsalan Nazari,
  • Hamid Payandeh,
  • Mohammad Mehdi Khaleghian,
  • Mohsen Saffari Pour

摘要

This study investigates the influence of various process parameters on the quality of oxygen-free copper tubes produced by the Upcast process. Key factors such as the fit between the graphite die and inner tube (ΔD), immersion height of the graphite die into the melt, melt temperature, and water flow rate were analyzed using a comprehensive central composite experimental design. Results show that ΔD, interactions between immersion height and melt temperature, and water flow rate significantly impact the solidification front location (SFL), tensile strength, and grain size. An extremum point at 1160 °C for melt temperature was identified, where SFL initially increases with temperature but decreases beyond this point. A tighter ΔD enhances tensile strength and alters grain size behavior. Optimal parameters for producing high-quality copper tubes were determined: ΔD of − 0.08 mm, water flow rate of 47 L/min, immersion height of 25 cm, and melt temperature of 1161 °C.