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

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.

The new LCS series offers a machine system for finish machining of hardened gears, characterized by its productivity and versatility. Two methods can now be used on a single machine: The LCS “Combi” Gear generating or profile grinding with dressable tools or plated CBN tools.

Gear grinding with dressable worms or form wheels has been a successful and well established technology for many years. Today, with the use of dressable sintered alumina tools, it has reached a remarkable level of performance. The CBN method, in comparison, stands out for its high machining consistency over the total tool life. With its exceptional tool life of up to 200 production hours, it offers a decisive advantage for high volume production. The Liebherr LCS series covers both technologies without limitations, opening up totally new possibilities for the user.

 

 

Available models

Model Name
LGG 180 / LGG 280
Max. workpiece diameter hob grinding/profile grinding (mm)
180 / 280
Max. workpiece speed (min-1)
3,000
Max. axial travel (mm)
660
Min. pos. over table (mm)
90
Grinding head tilt angle (Grad)
± 45°
Weight of machine with counterstand (ca. t)
13
Total connected load (ca. kVA)
32
Machine dimensions without automation (L x B x H) (m)
2.9 x 2.0 x 2.9
Shaft Length (mm)
500

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
Model Name
LCS 200 / LCS 300 / LCS 380 / LCS 500
Workpiece diameter (mm)
200 / 300 / 380 / 500
Table Speed (rpm)
2,000 / 2,000 / 1,000 / 1,000
Axial Travel (max) (mm)
600/1000
Axial travel speed (mm/min)
10,000
Radial travel speed (mm/min)
8,000
Grinding head swivel angle (deg.)
±35 (±45)
Module (max. generating grinding) (mm)
8
Module (max. profile grinding) (mm)
14
Grinding spindle speed rpm)
12,000
CBN tool diameter (max. generating grinding) (mm)
170
CBN tool diameter (max. profile grinding) (mm)
220
Alumina tool diameter (max. generating grinding) (mm)
320
Alumina tool diameter (max. profile grinding) (mm)
320
Tool length (max.) (mm)
230
Tangential travel (max.) (mm)
320
Spindle drive power (kW)
35
Machine weight with tailstock (appr. kg)
16,000
Total connected load (appr. kVA)
35

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
Model Name
LCS 600 / LCS 700 / LCS 1000 / LCS 1200
Workpiece diameter (mm)
600 / 700 / 1000 / 1200
Max. workpiece speed (min-1)
350 / 350 / 250 / 250
Max. module (generating grinding) (mm)
10
Max. module/profile hight (profile grinding) (mm)
20/50
Max. axial travel (mm)
1,000
Min. position above table (mm)
200
Max. position above table (mm)
1,200
Drive capacity grinding spindle (kW)
35
Max. tool speed (min-1)
12,000
Tool dia. (generating grinding) (mm)
320
Tool dia. (profile grinding) (mm)
320
Max. CBN-tool dia. (generating grinding) (mm)
170
Max. CBN-tool dia. (profile grinding) (mm)
220
Max. tool length (mm)
230
Max. tangential travel (mm)
320
Grinding head swivel angle (Grad)
± 35° (45°)
Axial speed (mm/min)
10,000
Radial speed (mm/min)
8,000
Tangential speed (mm/min)
10,000
Weight of machine with steady column (ca. kg)
25,000 / 25,000 / 28,000 / 28,000
Total connected load (ca. kVA)
60

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.
Model Name
LGF 800 / LGF 1000 / LGF 1250
Workpiece diameter (mm)
800 / 1,000 / 1,250
Max. workpiece speed (min-1)
250
Max. axial travel (mm)
1,000/1,4000
Min. position above table (mm)
350
Max. position above table (mm)
1,750
External grinding head drive power (kW)
37/63
Tool speed (rpm)
4,000
Max. tool dia (mm)
450
Max. workpiece width (mm)
130
Max. module/profile height (mm)
50/120
Grinding head swivel angle (Degrees)
120/-95
Internal grinding head drive power* (kW)
23
Axial speed (mm/min)
18,000
Radial speed (mm/min)
10,000
Tangential speed (mm/min)
10,000
Weight of machine with steady column (approx. kg)
33,000
Total connected load (approx. kVA)
65

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.
  • Machinery & Manufacturing
Liebherr-Verzahntechnik GmbHLiebherr-Verzahntechnik GmbH, founded in 1969, is one of the leading manufacturers of machine tools and automation systems. The company offers an extensive product program of machine tools and machine automation systems for economic manufacture of gearing products. The company supplies gearings, gearboxes, and slewing bearings to leading worldwide manufacturers.
[Liebherr, Cutting, Gear cutting, Gear generating, Profile grinding, LGG, LCS, LGF]