The processing category for items weighing 100kg to 500kg targets medium-weight main components such as industrial machinery, construction machinery, large molds, and parts for ships and railway vehicles. Processed goods in this weight range often require high strength and precision, and common materials include steel and cast iron. Typical processing methods primarily involve cutting using large NC lathes and gantry or horizontal machining centers. Additionally, welding for joining multiple components, heat treatment to improve material properties, and grinding for high-precision finishing are frequently applied. These processes require large, specialized equipment, advanced processing technology, and appropriate handling and fixturing jigs.