CITIZEN A20-3F7 sliding head lathe

CITIZEN A20-3F7 sliding head lathe was built in 2018 by CITIZEN MACHINERY ASIA CO., LTD. The machine, designed for precision machining of long workpieces with a maximum diameter of 25 mm, is an excellent choice for many industries, such as the automotive or aerospace industry. The machining process is performed inside a large working area by means of two spindles with C axis and cutting tools taken from a 21-position magazine. The high thermal stability bed inside effectively reduces the influence of heat, increasing the service life of all components and tools.

The CITIZEN A20 VII CNC automatic lathe is offered with a wide range of equipment, which includes e.g. an LNS bar feeder and an intelligent CNC control with many useful functions. The total weight of the machine is 2200 kg.

Technical specifications of the CITIZEN A20-3F7 CNC lathe

General data

• number of axes: 5 (X1, X2, Y1, Z1, Z2)
• rapid traverse in the X1 axis: 18 m/min
• rapid traverse in the X2,Y1,Z1,Z2 axis: 32 m/min
• maximum turning diameter: 20 mm (25 mm option)
• operating hours: 2097 h
• machine switch-on time: 3528 h
• power supply: 3x 200 V; 50/60 Hz
• dimensions (L x W x H): 2120 x 1240 x 1750 mm
• weight of the CITIZEN A20-3F7 machine: 2200 kg

Main spindle

• maximum turning diameter: 20 mm (25 mm option)
• maximum turning length: 200 mm
• maximum rotational speed: 10000 rpm
• main drive power: 3.7 kW
• C axis
• C axis indexation: 0,001°

Sub-spindle

• maximum turning diameter: 20 mm (25 mm option)
• maximum turning length: 80 mm
• maximum rotational speed: 8000 rpm
• main drive power: 1.5 kW
• C axis
• C axis indexation: 0,001°

Tool head

• maximum number of tools: 21, of which:

– driven tools: 4
– turning tools: 5
– drilling tools: 4 front/ 8 back

• maximum driven tools rotational speed: 6000 rpm
• driven tools drive power: 0.75 kW

Equipment of the CITIZEN CNC turning center

• CNC controller: FANUC Series 32i-B
• long workpiece machining package

– increase of machining diameter to 25 mm on both spindles
– rack for picking up long workpieces
– tube for picking up long workpieces
– sleeve-nut for spindle
– flange
– rotating sleeve

• bar feeder: LNS Express 220

– maximum bar length: 3 m
– maximum bar diameter: 20 mm
– minimum bar diameter: 2 mm

• bushings for bar feeder
• additional channel in bar feeder
• chip conveyor
• pinned collet seat for main spindle or sub-spindle for machining polygons
• driven toolholder for disc cutter from back slide