The heat generated by X-axis screw rod and z-axis screw rod will be directly transferred to X-axis bearing mechanism and z-axis bearing mechanism. The cooling box is connected with the heat dissipation channel set on the x-axis bearing mechanism and z-axis bearing mechanism, continuously conveying cooling oil for the x-axis bearing mechanism and z-axis bearing mechanism, so as to heat the X-axis screw rod and z-axis screw rod with good heat dissipation effect. The cooling box does not occupy the internal space of the CNC machine tool, and the cooling channel is directly set on the x-axis bearing mechanism and z-axis bearing mechanism, which also does not need to occupy the internal space of the CNC machine tool, and does not affect the processing space that can be used by the CNC machine tool. The x-axis screw rod and z-axis screw rod do not need to run through the heat pipe, which can keep their strength unaffected and maintain the loading capacity of the CNC machine tool.
