Gear technology and automation systems
LGG 180 - 280 / 400 M

A passion for surfaces.

Highlights

    Reliable
    Short grinding times
    Consistently high quality
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    Machine design

    The LGG 180/280 generating and profile grinding machine is suitable for machining gear components up to 180/280mm diameter. Diverse machining methods are available to address special customer needs. The generating and profile grinding machine combines short grinding times with consistently high quality in high-volume operations.

    Axes

    X1 - radial movement of column slide | V1 - tangential movement of tool | Z1 - axial travel of grinding head | B1 - rotary movement of tool | C2 - rotary movement of workpiece | A1 - swivel movement of tool | Z4 - vertical travel of steady column | C3 - rotary movement of ringloader

    Features

    • High quality and reliability across the entire series
    • Fast loading thanks to an integrated ringloader
    • Chip-to-chip times
      • Gears: As little as 4 seconds
      • Shafts: As little as 6.5 seconds
    • Small space requirement
    • Easy to maintain
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    LGG 400 M

    Liebherr also offers a manual generating and profile grinding machine for small batch sizes and outstanding flexibility.

    • Generating grinding max. workpiece diameter (mm): 280
    • Profile grinding max. workpiece diameter (mm): 400

    External and internal grinding heads

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

    In both external grinding heads, the balancing systems are integrated in the spindle. High drive power and speeds offer big advantages for example, when using new grinding material. Simple and fast replacement of the grinding arbor is made possible by the use of modern tool holding. For collision-critical workpieces and for special tooth corrections, small grinding tool diameters are available.

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    GH 320

    Speed (rpm): 7000
    Grinding spindle drive power (kW): 28.5
    Max. grindable module generating grinding (mm): 6
    Dimensions of grinding worm (DxLxW) (mm): 275(320)x160x160

    liebherr-gear-grinding-lgg-180-280-external-grinding-GH240

    GH 240 / 200 CB

    Technical data GH 240 CB

    Speed (rpm): 12,000
    Grinding spindle drive power (kW): 28.5
    Max. grindable module generating grinding (mm): 6
    Electro-plated CBN tools: Yes
    Dimensions of grinding worm: (DxLxW): 240x200x76.2

    Technical data GH 200 CB

    Speed (rpm): 17,000
    Grinding spindle drive power (kW): 28.5
    Max. grindable module generating grinding (mm): 5
    Electro-plated CBN tools: Yes
    Dimensions of grinding worm: (DxLxW): 240x200x40 (76.2)

    Fast and easy changeover

    The adaptable internal grinding arm can be mounted quickly and easily on the external grinding head and are driven using the main drive. Other grinding arms can be provided on request.

    In only 30minutes from external to internal grinding

    Video

    Gear manufacturing for aerospace

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    On-board inspection: Gear check in the machine

    All grinding heads can be equipped with an optional swivel-in probe for gear checking.

    Gear measurement

    • Profile and lead
    • Concentricity, single and cumulative pitch
    • Twist check
    • Measuring system for grinding stock removal
    • Rolling measurement
    • Determining dimension measurement
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    Mobile or stationary meshing sensor

    Technology

    liebherr-gear-grinding-lgg-gear-tec-future

    Prepared for the future

    Type of gears

    • Asymmetric profile
    • Beveloid gears
    • Double helical gears
    • Cycloidal gears

    Gear modification

    • Profile and lead modification
    • Free flank form
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    Cycloidal gears

    For cycloidal drives, certain requirements must be met, such as dimensional precision, a high-quality surface, an excellent profile and pitch as well as rollers that fit perfectly to the inner ring. Liebherr has developed something new for cycloidal gears: Now, cam disks with an external gear can be produced via generating grinding using not only single but also perfectly adapted double clamping. Depending on the individual batch-size requirements, which means that besides conventional profile grinding, an additional grinding method for cam disks is now available to users.

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    Generating grinding asymmetric gears

    Asymmetric gears compensate for unequally distributed loads.

    The advantages of asymmetric gears are obvious:

    • Reduced tooth root clamping forces and Hertzian flank stresses
    • Improved specific sliding
    • Increased surface durability and tooth root strength
    • Increased power density (load capacity in relation to gear size)
    • Longer service life
    • Increased efficiency
    • Reduced noise and vibration excitation
    • Increased operational reliability
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    Topological modifications

    • TF twist-free grinding
    • DFT deviation-free topological grinding
    • GER generated triangle-shaped end relief

    Modifications for noise reduction

    • SSG noise-reduction shift strategy
    • NEO noise excitation-optimized modifications

    Generating grinding with small tools

    Finishing grinding or polishing

    liebherr-gear-grinding-lgg-180-280-polishing

    Why modified and/or super-finished leads?

    Motivation:

    • Improved wear behavior
    • Reduction of friction losses
    • Increased flank and tooth root strength
    • Increased efficiency
    • Longer service life (gear and gearbox)
    liebherr-gear-grinding-lgg-180-280-polishing1

    Our solution: Finish grinding or polishing

    Lower surface roughness can be achieved with finish grinding or polishing. This increases the power density and gear efficiency.

    Generating or profile grinding with dressing-free CBN

    liebherr-gear-grinding-lgg-180-280-CBN-01

    CBN generating grinding

    • Short machining times (two-cut strategy)
    • No dressing required
    • Very low risk of grinding burn (short contact time, good thermal conductivity of CBN and steel basic body)
    • Universal tool design
    • Very long tool life
    • Robust process with high process stability
    • Module range 1.0 - 5.0mm
    • External gears with a high toothed length
    • Large batches, perfect for three-shift operation
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    CBN profile grinding

    • Very high profile quality
    • Pressure angle can be corrected by CNC (A, V and X axes)
    • Long tool life
    • Grinding of non-generating profiles and complex geometries
    • Module range 1.0 - 8.0mm
    • External and internal gears
    • Collision-critical gears (discs Ø < 30mm)
    • Small and medium-sized batches

    Integrated centrifugal device

    Automation

    liebherr-gear-grinding-lgg-machine-L-door

    Manual loading or loading via robot NC lifting station

    Bay with L door for manual loading or loading via robotNC lifting station
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    Plastic chain conveyor

    External automation system with plastic chain conveyor
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    LPC 3600

    External automation system with LPC 3600 palletizing cell

    Easy to operate

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    The new optimized control panel LHStation & LHMobile

    With the control panel, Liebherr intelligently divides the programming and operation of the machine between two system parts: The large, fixed monitor unit LHStation for data input and process monitoring and the standardized, mobile handheld terminal LHMobile with context-sensitive user guidance during setup. Both units have a multi-touch surface as well as tactile elements for optimum operating speed and operating safety.

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    Technical data

    VariantsLGG 180LGG 280LGG 400 M

    LGG 180 - 280 / 400 M