Abstract
Manufacturing industries are continuously evolving to meet the demands of complex geometries, high precision, and reduced production time. Traditional manufacturing processes are mainly categorized into additive manufacturing (AM) and subtractive manufacturing (SM). Additive manufacturing builds components layer by layer, while subtractive manufacturing removes material from a solid workpiece using cutting tools. Each process has its own advantages and limitations. Hybrid manufacturing processes that combine additive and subtractive machining have emerged as an effective solution to overcome these limitations. Hybrid systems integrate the flexibility of additive manufacturing with the accuracy and surface quality of subtractive machining. This paper reviews the concept, technologies, advantages, challenges, and applications of hybrid subtractive additive machining processes. Different hybrid manufacturing systems such as Directed Energy Deposition (DED) combined with CNC machining, Laser Metal Deposition with milling, and hybrid additive-subtractive machines are discussed. The review also highlights the role of digital technologies and Industry 4.0 in enabling these integrated processes. Although hybrid manufacturing has great potential, challenges such as process control, cost, and machine complexity still exist. Future developments in automation, artificial intelligence, and digital twin technologies are expected to further enhance the capability of hybrid manufacturing systems.
Keywords: Hybrid Manufacturing, Additive Manufacturing, Subtractive Machining, CNC Machining, Directed Energy Deposition, Industry 4.0
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