Liebherr - Gear Hobbing - LC Series

Key features

• The compact concept requires 20% less floor space. The proven advantages of the integral loader and part storage system are also available with this machine.
• Significantly increased axis and spindle speeds improve productivity and permit more complex machining processes such as roughing, finishing and chamfering with distinct tools in one setup.
• The tool spindle speed maximum of 7000 RPM allows cutting speeds up to 1700 m/min.
• Table speeds up to 1400 RPM enable the use of high number multi-start hobs to reduce cutting time.
• The workpiece loading time of the highspeed swivel loader for wheels up to 60 mm has been reduced to 1.4 seconds, resulting in a chip-to-chip time of less than 3 seconds. The more flexible ringloader enables a chip-to-chip time of 4.4 seconds.

Key features

• Optimised stiffness of the machine bed with FE Analysis model
• Thermo-symmetrical machine design for constant high quality
• Safe and problem-free removal of chips
• High flexibility for different processes: Gears, shafts, worm gears; Cluster gearing; Skiving; Positioned/Oriented gear teeth
• Wet and dry processing
• Hook-ready machine with compact floor space suitable for straightforward implementation
• Chamfer/Deburring in the working area
• The new, user-friendly LHGe@rTec® interface makes it much easier to operate the gear cutting machine and has many advantages for the operator
• Regenerative drive technology
• Use of efficient control cabinet chillers
• LED lighting
• Coolant supply and treatment with speed-controlled pumps

The great advantage of the LC 180 gear hobbing machine with the new separate Chamfer Cut unit is the simultaneous chamfer in a second machining position – two machines in one, so to speak. The LC 180 DC combines high chamfer quality with single-cut machining. After gear hobbing in the customary single-cut strategy, additional precise and repeatable chamfers are created with the appropriate chamfer cutter, and that with maximum economied performance.

Key features

• Simultaneous chamfering in a second machining position
• High chamfer quality with single-cut machining
• HSK 50 interface for chamfer spindle: Simple set-up by clamping the cutter onto a an arbor
• No need to shorten the hob length
• Separate fixture for hobbing and chamfering (Stiffness-optimised clamping for hobbing; Collision-optimised clamping for chamfering)
• Without bulging or secondary burrs

Key features

• 6 CNC axes
• Optimised stiffness of the machine bed with FE Analysis model
• Thermo-symmetrical machine design for constant high quality
• Safe and problem-free removal of chips
• Wet and dry processing
• High flexibility for different processes: Gears, shafts, worm gears; Cluster gearing; Skiving; Positioned/Oriented gear teeth
• Hook-ready machine with compact floor space suitable for straightforward implementation
• Hand or machine-internal crane loading
• Chamfer/Deburring in the working area
• The new, user-friendly LHGe@rTec® interface makes it much easier to operate the gear cutting machine and has many advantages for the operator
• Regenerative drive technology
• Use of efficient control cabinet chillers
• LED lighting
• Coolant supply and treatment with speed-controlled pumps

For the development of this machine series the characteristics of the very successful new machine generation from Liebherr was systematically transferred to the application of the universal machines LC 600 – LC 2000. The necessary flexibility for different applications is achieved with a two-piece machine bed. With this concept the machines can be optimally configured to customer specific requirements. The self-supporting, very rigid design permits a machine installation directly on the floor, without a special foundation. Chip removal is accomplished through the machine bed with the main chip conveyor arranged lengthwise. The machine bed and laterally arranged coolant tanks hold approx. 800 l of coolant.

Key features

• Maintenance-free, high-dynamic AC drive technology with different ratios for the backlash-free cutter drive provide the torque required for high performance cutting, at spindle speeds up to 1000 rpm and up to 45 kW. The hob arbor mounting can be with hollow shaft taper (HSK) to DIN 69893 or with ISO taper.
• Dual worm wheel drives or direct drives are used for a backlash-free table drive. The table spindle is equipped with hydrostatic radial and axial bearings for high table loads, up to 60/95/120 kN and maximum radial rigidity. The water cooled AC table drive ensures highest accuracy and reliability. Large table bores accommodate hydraulic clamping cylinders for actuating workpiece clamping fixtures.
• PC based control technology
• Digital drive technology
• Integrated PLC
• Advanced field bus systems (profi bus)
• TFT flat screen
• Optional network integration
• Dialog input tailored to gear machining
• Teleservice
• Diagnostic tools
• Workpieces up to 800 mm diameter can be automatically loaded and unloaded with a 2-station ringloader. Parallel grippers with adjustable diameter range are used for a large part variety.