This utility model provides a power head device for a milling-turning composite CNC
machine tool, comprising: a power housing, a
front cover on the surface of the power housing, a third sealing ring inside the
front cover, a sealing device inside the power housing, a spindle inside the sealing device, a central water outlet inside the spindle, and a third oil seal fixedly installed on the surface of the spindle. This utility model provides a power head device for a milling-turning composite CNC
machine tool. Through the central water outlet in conjunction with a circulating water circuit, a first water inlet, and a second water inlet, water flows into the interior of the power head. The water, under pressure, allows
coolant to be directly transferred to the
cutting tool tip through the spindle, increasing
cutting speed and thus improving production efficiency. Simultaneously, the water effectively cools the
cutting tool tip internally, improving tool durability and reducing the risk of
tool wear and breakage.