Semi-continuous casting is a process that involves controlling the flow of molten metal and the entire casting procedure through a control system made up of various sensors during the production of castings. 

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The semi-continuous casting process has the advantage of fully utilizing the high efficiency and automation features of the continuous casting machine to enhance production efficiency and product quality. Additionally, by incorporating the traditional casting process in certain stages, it can achieve superior casting properties and surface quality.

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In the semi-continuous casting procedure, the caster typically serves as the central equipment of the entire production line. It can accomplish high-speed casting, continuous gear adjustment, automatic control, and other functions through continuous casting technology, thereby improving production efficiency and product quality. Simultaneously, the hydrostatic bed or static sand bed, which are process equipment of the iron casting process, can be adjusted and controlled locally based on specific casting requirements to achieve better casting performance.

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In essence, semi-continuous casting merges the benefits of continuous casting technology and traditional casting technology, enabling high-efficiency and high-quality casting production. It has found extensive application in engineering practice, particularly for large and complex structure castings, due to its excellent adaptability and cost-effectiveness.