LCS 600 - 1200 | Generating and profile grinding machines

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LCS 600 - 1200

Large dimensions. Fantastic technology.

Highlights

metric

imperial

Workpiece diameter - 600 - 1,200 mm
600 - 1,200 mm
Axial travel - 1,450 mm
1,450 mm
Shift distance - 320 - 350 mm
320 - 350 mm
Min. position above table - 200 mm
200 mm
Grinding head swivel angle - 45 °
45 °
Workpiece speed - 250 - 350 min-1
250 - 350 min-1

Generating grinding up to module 14mm

Generating grinding workpieces up to 1,200mm in workpiece diameter

Workpiece automation up to a workpiece diameter of 800mm and a workpiece weight of 1,000kg

Machine design

The new LCS Series 3 provides a machine system for the hard-fine machining of gears, which is characterized by its outstanding efficiency and versatility: generating or profile grinding with dressable or electro-plated CBN tools.

Gear grinding with dressable worms or discs has been a successful and well established technology for many years. Today, with the use of sintered corundum tools, it has reached a remarkable performance level.

With the LCS series, Liebherr enables the user to use both technologies without limitation, unlocking completely new possibilities in particular generating grinding the sorts of larger gears used in the wind power industry, for example.

The grinding heads, with their proven design principle, provide motor spindle speeds up to 12,000rpm. Their high degree of thermal stability is essential for achieving unparalleled quality.

Active tool holding on both ends guarantees excellent tool rigidity. This allows for feed rates up to 10m/min and a cutting speed of 100m/s.

With the two-station ringloader, workpieces up to 800mm in diameter can be automatically loaded and unloaded. Storage systems are available for unmanned operation of the machine.

Axes

_{A1 - swivel movement of tool | B1 rotary movement of tool | B3 - dressing tool axis | C1 - table axis | C3 - rotary movement of ringloader | C5 - dresser swivel axis | V1 - tangential movement of tool | X1 - radial movement of machine column | Z1 - axial movement of tool | Z4 - vertical motion of tailstock | Z5 - vertical motion of ringloader}

Double dresser

Double dresser for dressing grinding worms or form grinding discs with two independent, frequency-controlled dressing spindles.

Functional principle:

Single flank dressing
Dressing of the tooth tip via rotating radius roller
Pressure angle correction via C5 axis

Advantages:

Easy to use universally
With radius control, the sharp-edged transition from the tooth flank into the area of the tooth root can be avoided
Longer radius roller life compared to dressing plate
Avoidance of grain chipping in the area of the grinding worm head means greater process stability

Application examples

Video

Generating grinding large modules on the LCS 700 generating and profile grinding machine

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Dressing, grinding and loading on the LCS 600 generating and profile grinding machine

GH 3.0

Drive power (kW): 35
Speed (rpm): 12,000
Max. cutting speed (m/s): 80
Max. grindable module generating grinding (mm): 12
Max. grindable module profile grinding (mm): 20
Max. shift distance (mm): 320
Dimensions of grinding worm (DxLxW) (mm): 320x230x110

GH 320 CB

Drive power (kW): 28.5
Speed (rpm): 10,000
Max. cutting speed 80m/s
Max. generating grinding module 14mm
Max. profile grinding module 20mm
Max. shift distance (tangential distance) 350mm
Dimensions of grinding worm (DxLxW) (mm): 320x250x110
Feature: For this grinding head, various different internal grinding arms are available

On-board inspection: Gear checking 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

Video

On-board inspection on the LCS 600 generating gear grinding machine

Mobile meshing sensor

Technology

Prepared for the future

Gearing types

Asymmetric profile
Beveloid gears
Double helical gears
Cycloidal gears

Gear modification

Profile and lead modification
Free flank form

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

Requirements when generating grinding asymmetric gears

Machine technology:

Centering of the dresser/grinding worm
Centering of the asymmetric grinding worm/workpiece
Initial profiling and tracking of the asymmetric profile at every dressing cycle
Precise control technology for dynamic tooth flank contact sequences

Technology: