The Gear-Hobbing Machines LC

Home , Gear, Hobbing

Machine Tools and Automation Systems by Liebherr The Gear-Hobbing Machines With around sixty years of experience in the field, Liebherr is one of the world‘s leading manufacturers of CNC gear cutting machines, gear cutting tools and automation systems. These innovative products are the result of advanced ideas, highly qualified employees and the latest manufacturing systems at each of their locations. They are characterised LC 200 – 500 by economy, ease of use, quality and reliability in combination with a high degree of flexibility. Liebherr employs approximately 1,200 people in the field of machine tools and automation technology and has production facilities in Kempten and Ettlingen (Germany), Collegno (Italy), Saline (Michigan, USA) and Bangalore (India). They are supported by expert and reliable marketing and service specialists at a large number of locations worldwide.

System Solutions for High-Quality Gear Cutting Machines Gear Cutting Tools The Liebherr range in the field of gear cutting machines Liebherr manufactures high-quality precision tools for the includes gear hobbing machines, gear shaping machines soft and hard machining of gears and all Liebherr gear and hobbing and profile grinding machines, all noted for cutting machines are fitted with these tools. The range also their high degree of stability and availability. Liebherr can includes Lorenz stock tools and products customised for supply all technologies required for the manufacture of specific applications. high-quality gears and is continuously developing these technologies. Particular importance is attached to the Automation Systems for a Wide energy efficiency of the machines. Range of Applications Gear cutting machines from Liebherr are supplied to Liebherr has a wide range of products for linear portals, renowned manufacturers of gears and gearboxes as well pallet-handling systems, conveyor systems and robot as large-scale slewing rings worldwide. They are in demand integration for projects in all areas of production and can primarily from the automotive and construction machin- provide above-average availability of systems. ery industries and also increasingly from the windpower industry for the manufacture of gears for wind turbines. www.liebherr.com

Liebherr-Verzahntechnik GmbH Liebherr-Utensili S.r.l. Liebherr-Gear Technology Inc. Liebherr-Machine Tools India Pvt. Ltd Werk Ettlingen Gear cutting tools Machine tools Machine tools Gear cutting tools Via Nazioni Unite 18 Liebherr Automation Systems Co. 353/354, 4th Main, 9th Cross, 4th Phase Hertzstraße 9-15 10093 Collegno TO, Italy Automation systems Peenya Industrial Area 76275 Ettlingen, Germany  +39 (0)114 248711 1465 Woodland Drive Bangalore - 560 058, India  +49 (0)7243 708-0 Fax +39 (0)114 559964 Saline, MI 48176-1259, USA  +91 (0)80 41 273033 Fax +49 (0)7243 708-685 [email protected]  +1 7344 297225 Fax +91 (0)80 41 272625 [email protected] Fax +1 7344 292294 [email protected] [email protected]

Subject to change without prior notice. Liebherr-Verzahntechnik GmbH Machine tools, automation systems Kaufbeurer Straße 141, 87437 Kempten, Germany  +49 (0)831 786-0, Fax +49 (0)831 786-1279 www.liebherr.com, e-mail: [email protected] The Machine Concept

In gear manufacturing, the technology of high-speed dry To take advantage of the substantially lower machining hobbing has substantially reduced cutting times and ma- times of high-speed hobbing, fast load and unload cy- chining costs while increasing workpiece quality and en- cles are required. With the newly developed automation vironmental protection. Originally introduced by Liebherr, system, the part change time is less than four seconds. this process has met with tremendous success. Modular workpiece storage units expand the machine pe- The new demands of this modern technology include riphery. higher hob and table speeds, reliable removal of the hot In the development of the overall machine concept, the chips, and machine-wide management of the consider- “lean” philosophy was a central issue. The new gener- able process heat. The proven machine concept also of- ation Liebherr machines are compact, fast, reliable and fers a number of significant new developments: the com- competively priced. The future belongs to the new tech- pletely symmetrical design of the machine’s structur- nology of high-speed dry hobbing. We are making a de- al components and the closed oil-circulation loop in the cisive contribution to this economically and ecologically machine bed assure an extremely uniform temperature important development. distribution and therefore thermal stability – important for consistently high workpiece quality.

A1 Z4 B1

C2 V1 C3 X1

2 The Machine Bed The rigidity of the machine structure was optimized using FEA simulation. Steep side walls and two integrated chip augers offer ef- ficient 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 3000 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 ac- curacy.

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.

3 The Controls – Intelligence from Experience In standard, the machines are delivered with Siemens- control 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 load- ing / 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 load- ing/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 grip- per 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 down- times and an easy maintainability. This is a prime asset of Liebherr. Therefore all control elements are integrated in the machine housing with ideal accessibility.

4 Technical Data

LC 200 LC 300 LC 380 LC 500 Max. workpiece diameter mm 200 300 380 500 mm 7 (12) 7 (12) 7 (12) 7 (12) Max. axial travel mm 600 600 600 600 Table diameter mm 180 250 320 320 Table speed rpm 100/200/400 100/200/400 100/200/400 100/200/400 Center Distance between hob and table min. mm 15 15 15 15 max. mm 400 400 400 400 Hob-head swivel Shift 200 mm +/- 45 +/- 45 +/- 45 +/- 45 degrees Hob-head swivel Shift 300 mm +/- 35 +/- 35 +/- 35 +/- 35 Max. shift/tangential travel mm 200/300 200/300 200/300 200/300 Max. hob diameter mm 160 (220°) 160 (220°) 160 (220°) 160 (220°) Max. hob length mm 230/330 230/330 230/330 230/330 Axial rapid travel mm/min. 10,000 10,000 10,000 10,000 Radial rapid travel mm/min. 7,50 0 7,50 0 7,50 0 7,50 0 Tangential rapid travel mm/min. 3,000 3,000 3,000 3,000 Hob-spindle speed ranges rpm 500 500 500 500 rpm 750 750 750 750 rpm 1200/1500/3000 1200/1500/3000 1200/1500/3000 1200/1500/3000 Cutter-spindle drive capacity kW 14/27 14/27 14/27 14/27 Total weight of machine with tailstock column ca. kg 16,000 16,000 16,000 16,000 Total connected load ca. kVA 35-50 35-50 35-50 35-50 * FK 2.3

5655 3400

1850 970

H/S 1560 C

CH 915 3810

E 600 625

2200

5 Machine Tools and Automation Systems by Liebherr

With around sixty years of experience in the field, Liebherr is one of the world‘s leading manufacturers of CNC gear cutting machines, gear cutting tools and automation systems. These innovative products are the result of advanced ideas, highly qualified employees and the latest manufacturing systems at each of their locations. They are characterised by economy, ease of use, quality and reliability in combination with a high degree of flexibility. Liebherr employs approximately 1,200 people in the field of machine tools and automation technology and has production facilities in Kempten and Ettlingen (Germany), Collegno (Italy), Saline (Michigan, USA) and Bangalore (India). They are supported by expert and reliable marketing and service specialists at a large number of locations worldwide.

Printed in Germany by Eberl BK 0.2-07.14_enGB Subject to change without prior notice. Liebherr-Verzahntechnik GmbH Machine tools, automation systems Kaufbeurer Straße 141, 87437 Kempten, Germany  +49 (0)831 786-0, Fax +49 (0)831 786-1279 www.liebherr.com, e-mail: [email protected]