The CNC Gear-Hobbing Machines LC 200 – 500

The Machine Concept In gear manufacturing, the technology of high-speed dry hobbing has substantially reduced cutting times and machining costs while increasing workpiece quality and environmental protection. Originally introduced by Liebherr, this process has met with tremendous success. The new demands of this modern technology include higher hob and table speeds, reliable removal of the hot chips, and machine-wide management of the considerable process heat. The proven machine concept also offers a number of significant new developments: the completely symmetrical design of the machine’s structural components and the closed oil-circulation loop in the machine bed assure an extremely uniform temperature distribution and therefore thermal stability – important for consistently high workpiece quality.

To take advantage of the substantially lower machining times of high-speed hobbing, fast load and unload cycles are required. With the newly developed automation system, the part change time is less than four seconds. Modular workpiece storage units expand the machine periphery. In the development of the overall machine concept, the “lean” philosophy was a central issue. The new generation Liebherr machines are compact, fast, reliable and competively priced. The future belongs to the new technology of high-speed dry hobbing. We are making a decisive contribution to this economically and ecologically important development.

Z1

A1

Z4 B1

V1 X1

2

C2

C3

The Machine Bed The rigidity of the machine structure was optimized using FEA simulation. Steep side walls and two integrated chip augers offer efficient and reliable chip removal. This is especially important for dry cutting.

The Hob Head A maintenance free direct drive AC motor is used for the hob spindle. Drive power up to 27 kW and speeds up to 4500 rpm offer large reserve capacity for future tool developments. For very high torque requirements the hob head is equipped with a reduction gear drive. The tool interface is offered either with a hollow shaft taper (HSK), a collet or a steep taper (ISO).

The Machine Table with direct or gear drive A backlash free table drive is essential for high precision gear cutting. For conventional cutting technology, a proven backlash free gear driven table is available. For high performance cutting, a high dynamic direct drive is available to meet all requirements for spindle speed and accuracy.

Integrated roll deburring and chamfering Roll deburring and chamfering of the gear teeth, with removal of secondary burr, is suitable for bore and shaft parts. The deburring and chamfering operation is parallel to the main cutting time.

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The Controls – Intelligence from Experience In standard, the machines are delivered with Siemenscontrol in connection with Siemens-drives. The essential features of these advanced controls are: • 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 With these customer-oriented options, we satisfy the demands of the international markets.

Versatile Workpiece Handling The tailstock column enables manual and automatic loading / unloading of bore- and shaft-type parts for dry and wet machining. The workpieces may optionally be clamped table-side with high clamping force or – for shorter cycle times – with an NC tailstock arm. Liebherr offers automatic loading/unloading and storage systems for a wide range of workpieces. Furthermore, the machine can be integrated into cell or line concepts. The machine offers quick change-over possibilities for flexible use via a quick change system for workpiece gripper and fixtures.

Automation - for any Requirement The Liebherr automation systems are based on long experience, i.e. they are proven and effective solutions. For stand-alone machines, machining cells or production lines Liebherr is the competent partner.

High Uptime - Friendly Maintenance The high performance of the machine requires low downtimes and an easy maintainability. This is a prime asset of Liebherr. Therefore all control elements are integrated in the machine housing with ideal accessibility.

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Technical Data Max. workpiece diameter Max. axial travel Table diameter Table speed Center Distance between hob and table Hob-head swivel Max. shift/tangential travel Max. hob diameter Max. hob length Axial rapid travel Radial rapid travel Tangential rapid travel Hob-spindle speed ranges

Cutter-spindle drive capacity Total weight of machine with tailstock column Total connected load

LC 200 LC 300 LC 380 LC 500 mm 200 300 380 500 mm 7 7 7 7 mm 600 600 600 600 mm 180 250 320 320 rpm 100/200/400 100/200/400 100/200/400 100/200/400 min. mm 15 15 15 15 max. mm 300 360 400 400 degrees +/- 45 +/- 45 +/- 45 +/- 45 mm 200/300 200/300 200/300 200/300 mm 160 160 160 160 mm 230/330 230/330 230/330 230/330 mm/min. 10,000 10,000 10,000 10,000 mm/min. 7,500 7,500 7,500 7,500 mm/min. 5,000 5,000 5,000 5,000 rpm 500 500 500 500 rpm 750 750 750 750 rpm 1200/1500/4500 1200/1500/4500 1200/1500/4500 1200/1500/4500 kW 14/27 14/27 14/27 14/27 ca. kg 15.000 15.000 15.000 15.000 ca. kVA 35-50 35-50 35-50 35-50

5655 3400

H/S

C

970

1560

1850

3810 E

625

600

915

CH

2200

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The locations

Liebherr-Verzahntechnik GmbH Liebherr-Utensili S.r.l. Werk Ettlingen

Liebherr-Gear Technology Co.

Liebherr Machine Tools India Pvt. Ltd.

Hertzstrasse 9-15 D-76275 Ettlingen

Via Nazioni Unite 18 I-10093 Collegno TO

1465 Woodland Drive Saline, MI 48176-1259 USA

353/354, 4th Main, 9th Cross, 4th Phase Peenya Industrial Area Bangalore - 560 058, India

 +49 (0)7243 708-0 Fax +49 (0)7243 708-685 E-Mail: [email protected]

 +39 (0)11 4 24 87 11 Fax +39 (0)11 4 55 99 64 E-Mail: [email protected]

 +1 7 34 429 7225 Fax +1 7 34 429 2294 E-Mail: [email protected]

 +91 (0)80 4127 3033 Fax +91 (0)80 4127 2625 E-Mail: [email protected]

Printed in Germany by Roth BK 04.11

Liebherr-Verzahntechnik GmbH Kaufbeurer Strasse 141, D-87437 Kempten  +49 (0)831 786-0, Fax +49 (0)831 786-1279 www.liebherr.com, E-Mail: [email protected]

Subject to modifications.