The casting process is a manufacturing method where molten metal is poured into a mold and solidified, making it ideal for mass production with precise shape formation. However, traditional casting relies heavily on operator experience, leading to inconsistent quality. While deep learning-based defect prediction has gained attention, the black box nature of AI models limits interpretability, reducing operator trust. To address this, we propose a deep learning-based Multi-Role AI Model that integrates three key functions: (1) Pass/Fail prediction, (2) defect cause analysis using Explainable AI (XAI), and (3) optimal process variable exploration. Experimental results show 98.7% accuracy in defect prediction, effective identification of defect causes, and optimized process parameters that minimize defects and reduce costs. This study enhances fault prediction reliability and process efficiency in casting through AI-driven optimization.