KF7700B II | KF7700B/50 II

Overview

KF7700B II | KF7700B/50 II is described as the fastest and most versatile KF7700BII vertical center in high precision and rigid linear machining. Both models share Table Size [mm] 1,650×760 and Max. Load Capacity [kg] 1,500. Travel (X,Y,Z) mm is 1,500/760/635 and Rapid Feed Rate (X/Y/Z) [m/min] is 30/30/24. The machines use a Direct Spindle Driving Method with Spindle Taper [tip] BBT40 and Slide Type [tip] Box. Spindle Power [kW] is 15/11 and Spindle Torque [Nm] is 286/143. A directly coupled spindle is described with a maximum revolution of 12,000rpm allowing highspeed processing; the technical tables list Spindle RPM [r/min] as 8,000. The KF7700B II table lists No. of Tools as 30 with Tool Change Time (Chip To Chip) [sec] 3.7, while the KF7700B/50 II table lists No. of Tools as 24 with Tool Change Time (Chip To Chip) [sec] 5.5. A magazine that can attach various tools between 24~40 EA was adopted and the overall size of the magazine was reduced to reduce vibration during magazine rotation. The structure features a High-Rigidity Design For Column & Bed with a stable design of the column assembly surface on the bed top to secure fundamental rigidity. The KF-B II Series are equipped with box guideways that distribute feeding force evenly to each slideway, providing excellent rigidity and a stable feed structure. A pretensioned, double anchored ball screw minimizes expansion and contraction according to the heat and reinforces rigidity by the double anchor support method, with ballscrews coupled to digital servo motors by metal plate couplings to reduce coupling breakage and backlash. The spindle uses a Big Plus shaft system (BBT40) to ensure double contact between the shaft and the tool holder, and a spindle cooling system to minimize thermal displacement. Through Spindle Coolant (20/30/70 bar) is provided. Position control is handled by a twin arm ATC on servo motors for high speed ATC operation. Interior chip handling includes dual screw type chip conveyors at each side of the bed, with three screws for rear-type conveyor (2 sides + 1 front), and optional bed-flushing coolant to improve chip disposal capability. The product is positioned for heavy-duty cutting, with a high power/torque main spindle and box guideways described as providing superb heavy duty cutting performance. The directly coupled spindle and the stated maximum revolution of 12,000rpm support highspeed processing, and Through Spindle Coolant (20/30/70 bar) is explicitly cited as exceedingly useful when drilling deep holes, increasing tool lifetime and decreasing cycle time. Tool handling and production flow are supported by a high speed twin arm ATC that enables faster tool change and increased productivity, a magazine accommodating 24~40 EA, and interior screw chip conveyors (dual side or three-screw rear-type) with optional bed-flushing coolant to enhance chip processing and disposal. The machine also offers various motors and columns for customized machining and improved user convenience by applying the latest controller of FANUC.