Liebherr - Gear Generating and Profile Grinding - LGG/LCS/LGF Series

The new generating and profile grinding machine LGG 180/280 is suitable for the processing all gears up to 180/280 mm diameter. In addition, workpieces can be machined to 650 mm length. For special customer needs various machining variants are available. The generating and profile grinding machine combines short grinding times with consistently high quality in high-volume operations.

Key features

• Higher quality and reliability across the entire lot size
• Single-table solution (One clamping fixture, one geometry; For all gears up to 180/280 mm; Shaft length 500 mm (650 mm as L-version); Planet and sun gears, ring gears and input and output shafts)
• Machine bed made of thermally stable material
• Fast loading thanks to integrated ring loader
• Chip-to-chip times (Gears: 4 seconds; Shafts: 6,5 seconds)
• Small amount of space needed
• The new, user-friendly LHGe@rTec® interface makes it much easier to operate the gear cutting machine and has many advantages for the operator

The wide range of machine sizes always offers the most suitable model for each application. The basis of the new LCS series of machines is the Liebherr gear hobbing and gear shaping machine platform. Synergy within the modular component system offers the user the most cost effective equipment.

Key features

• Independent of the grinding technology, the user has a choice of using CBN or sintered alumina tools
• Easily accessible control elements, long maintenance intervals (MTBF), short repair times (MTTR). Well thought-out equipment design, coupled with optimal service (R&M principles), reduce machine down times for routine maintenance, increasing productivity and lowering life cycle costs.
• The completely symmetric design of the machine frame, with enclosed circulating coolant system of the machine bed, allows uniform distribution of temperature to maintain thermal stability
• The direct-drive work spindle combines high speeds of up to 800 rpm with an extremely high positioning accuracy
• Maximum speed of 12,000 rpm (20,000 rpm) drives the grinding tool, allowing cutting speeds of more than 100 m/s.
• The ring loader, with CNC drives, is extremely flexible, further reducing setup and workpiece changing times

With the new LCS series 3 Liebherr has developed a machine system for the hard finishing of gears, which is characterised by its special efficiency and universality: generating or profile grinding with dressable or plated CBN tools. As Liebherr covers both technologies with the LCS series, the user can work with completely new possibilities, particularly with grindings of large gears as for example used in the wind power industry.

Key features

• The grinding head is based on a proven design principle with spindle speeds up to 12,000 rpm.
• Its high thermal stability is a prerequisite for profile grinding.
• Active tool clamping on both ends guarantee high tool rigidity.
• With the 2-station ringloader workpieces up to 600 mm in diameter can be automatically loaded and unloaded.

Key features

• Able to grind topologically correct or topologically freelydefined tooth flanks on one flank or two flanks highly efficiently.
• The LFG can be changed over for grinding of internal gears with only a minimum of effort.
• The LFG is equipped with an automatically adjusting grinding oil nozzle.
• The measuring head is parked behind the directly driven grinding spindle. In swung out position the measuring head allows measurement within the machine.
• The internal grinding head can easily be put on and has the same advantages as the LFG-grinding head: NC-coolant nozzle and automatic measuring unit.