Three dimensional drilling is mainly composed of bed, CNC sliding table (3), drilling spindle box (3), side pressing device, trolley feeding mechanism, air mist cooling system, hydraulic system, numerical control system, chip conveyor, etc. The lathe bed is fixed and the workpieces are movable. The bed is welded by steel plates with sufficient strength. The three-dimensional drill of this structure is suitable for the processing of medium-sized H-beam steel, which is convenient for continuous production and high degree of automation. There are three CNC slideways in the 3D drilling machine tool, which are the fixed side CNC sliding table, the mobile side CNC sliding table and the upper unit CNC sliding table. The structure of the three slides is similar, which is composed of slide plate, slide seat and servo drive system. There are 7 CNC axes in the machine tool, and each slide table is a NC axis, that is, the CNC axis of the sliding table on the fixed side and the sliding table on the moving side, and the horizontal movement direction of the upper unit sliding table. Each CNC axis is guided by precise linear rolling guide rail and driven by AC servo motor and ball screw, which can ensure its positioning accuracy. < br style = "list style type: none;" / > there are three drilling headstocks in the 3D drilling machine tool, i.e. the upper unit, the fixed side and the mobile side. They are respectively installed on three CNC sliding platforms for horizontal and vertical drilling. Each drilling headstock can not only run independently, but also complete drilling operation at the same time, which greatly improves the efficiency. The feed motion of each drilling spindle box is guided by precise linear rolling guide, driven by AC servo motor and ball screw, which can ensure the stability of drilling. The spindle of drilling spindle box is equipped with flat tail Morse taper handle module, which has high positioning accuracy and is convenient to exchange drill bits. The spindle speed of each drilling spindle box is stepless regulated by frequency converter. The workpiece is fed into 7 CNC axes, and the feeding mode of NC trolley is adopted to ensure the longitudinal position accuracy of drilling. < br style = "list style type: none;" / > the knowledge about these configurations of 3D drill is introduced here first. As the main equipment for secondary processing of steel structure in recent years, 3D drill is widely welcomed in the steel structure industry.