MZ120 – Gear hobbing/worm milling machine

The MZ120 is a gear hobbing and worm milling machine for the production of gears and worm gears, straight-toothed bevel wheels, worms and threads. It is suitable for large and small series.

The machine is mounted on a solid cast iron base, inclined to the front side by 15°.The longitudinal-, the shift- and the plunge axis are driven by a ball screw.The work piece spindle can be equipped with W20 collets, retractable arbors or customer specific work holding.The CNC-tailstock clamping pressure can reach up to 2000 N, torque controlled. Below 500 N, the clamping pressure is generated by spring load.The CNC-shift axis is integrated in the hob head and has a travel distance of 34 mm. The Hobbing- and milling spindle is equipped with ball bearings. Tool holders are fit to a cylindrical bore. The swivel angle on the hobbing- and milling spindle is programmable. The range go’s from +45° to 0° to -120°.The spindle drive is over a precision worm gear.

Options
- Synchronous axis drive of tailstock spindle (hobbing), dismountable
- Work piece positioning by dynamic pressure sensor
- Customer specific loading- and unloading systems
CNC-control
- Fanuc 30i-B
- 6 servo axis, optional up to 8 axes
- Dialog programming
- Swiveling touch screen with user panel
Technical features
- Structure out of solid cast iron- and steel, in vibration absorbing execution
- Improved outlet for chips and coolant
- Axis distance between work piece and hob up to 70 mm
- Swivel angle hob head: gear hobbing ± 45 °, worm milling ± 30 °
- Hob shift 34 mm
- Clamping systems: center – center, collet W20, retractable arbor, guide bush
- Hydraulic deburring unit
- Automatic central lubrication
- Revolving tailstock (axial)
Workpiece data
- Module, depending on the material, max. 1.0 mm
- Workpiece diameter 2 – 45 mm
- Workpiece length up to 250 mm
- Hobbing length up to 150 mm
Tool data
- Gear hobbing: diameter 16 – 32 mm, length up to 40 mm
- Worm milling: diameter 53 – 70 mm
Workpiece spindle
- Ratio i = 1:3.875
- Speed up to 750 rpm
Hobbing- and milling spindle
- Diameter 40 mm
- Speed up to 7’000 rpm
- Power 0.55 kW
- Torque 2.4 Nm