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November 2018

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Large Gear Grinding Machine

The newly designed gear grinding machine LGG 400 from Liebherr

The LGG 400 M is suitable for long shafts

Liebherr offers its larger LGG 400 M model gear grinding machine developed to suit aerospace and job shop customers. It fits into the same footprint as the LGG 280, but has grown in height. With a different housing and a column extension, it is suitable for machining long shafts because the travel of the main and counter column has been extended.

"Our users can utilize a variety of grinding heads for internal and external gears," said Oliver Kraft, Manager Development and Design of Gear Cutting Machines at Liebherr-Verzahntechnik GmbH. "They can perform generating grinding with high productivity on workpieces up to 280 mm in diameter or profile grinding on even larger components up to 400 mm. This means even greater flexibility than the LGG 280."

Ideal for Long Shafts

The concept came about from the requirements of the market. Long shafts with small diameters have come into demand, required by customers in the aerospace and job shop industries-often for short runs. Liebherr offers an optional crane for optimal handling of large parts. "We have ergonomically adapted the machines overall," Kraft explained. "Due to the height, we have incorporated fold-out stair steps so workers are better able to reach the working area. Large viewing windows provide the operator with the best possible overview of the working area and the process."

The LGG machines are suitable for hob grinding and profile grinding. As standard, the machines are equipped with an external grinding head and can be supplemented with an internal grinding head.

Process-optimized external and internal grinding heads are available for the LGG. In both external grinding heads, internal spindle balancing systems are employed. High drive power and speeds are great benefits, e.g. when used with new grinding material. Simple and fast replacement of the grinding pin is eased with modern tool clamping.

For collision-critical workpieces and for special tooth corrections, small grinding tool diameters are available. The adaptable internal grinding heads can be mounted quickly and easily on the external grinding head and are driven via the main drive.

The new, user-friendly LHGe@rTec interface makes it much easier to operate the gear cutting machine and has many advantages for the operator:

  • Individual configuration
  • Intuitive operation
  • User guidance for process and change-over procedures
  • Mathematical analysis
  • Touchscreen
  • Graphical input support
  • Incorporation of additional documentation (e.g. fixture layout, hob tool/arbor assembly, etc.)
  • Integrated webcam
  • Siemens 840 D Solutionline

The Collision Control software package is available to minimize damage in the event of unexpected impact between tool and clamping fixture or spindle and machine table.

For more information contact:

Liebherr Gear Technology, Inc.

1465 Woodland Drive

Saline, MI 48176-1259


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