LC 300 - 500 / 700 M

The powerful HH 240 hob head enables workpieces up to a module of 12 mm to be machined. With different gear rations, up to 3000 RPM are possible. Due to the large travel range of the counter bearing, very long or, if necessary, relatively short tools can be used. As standard, even hobs with a maximum diameter of 240 mm can now be accommodated.

The hob head with a range-change gearbox is exceptionally well suited for particularly high torque requirements. Using different gear ratios, the optimum configuration for your requirements can be found.

Drive power (kw): 27
Max. module (mm): 12 / 12 / 9 / 3.5
Speed (rpm): 600 / 900 / 1500 / 3000
Gear ratios: 12 / 8 / 5 / 2,5

Optionally, the hob head can be equipped with a meshing/positioning device or a swiveling probe for gear check.

Special attention was paid to perfected dry machining during the development of the new machine generation. Thanks to the design-optimized machine bed, chips can be removed even better. In addition, essential components such as the machine table, the machine bed, the machine column and the flat guides have been covered with stainless steel covers so hot chips have no influence on the temperature behavior. This guarantees constant temperature behavior and has a significant effect on gear quality and process stability.

With the control panel, Liebherr is intelligently dividing the programming and operation of the machine between two system parts: The large, fixed monitor unit LHStation for data input and process monitoring and the standardized, mobile handheld terminal LHMobile with context-sensitive user guidance during set-up. Both units have a multi-touch surface as well as tactile elements for optimum operating speed and operating safety.

• 10-inch multi-touch as standard
• Context-sensitive views such as PLC/NC keys and program statuses
• Wired signal transmission for maximum safety

With the LHGearTec software, the system constantly guides users when entering workpiece and tool data, as well as during workpiece correction and process monitoring. The user guidance was redefined in intensive cooperation with designers and users.

More information

Optimum machine accessibility during maintenance work is a prerequisite for ensuring productivity. For this purpose, all necessary maintenance access points are equipped with doors. Moreover, to enable quick and easy additional monitoring of specific statuses, window panes are inserted into the maintenance doors. This means the machine operator or maintenance personnel can read the signals from outside in very little time. An enclosure for the hydraulics has also been integrated into the new machine design. This ensures sustainable reductions to hydraulic power unit noise.

The chamfering technology used can be either the familiar ChamferCut and/or the newly developed FlexChamfer process. A particularly notable feature is that workpieces with a diameter of up to 500 mm can now also be chamfered during the machining process. In addition, both processes can be used. This means that the finger milling unit can be mounted quickly and easily. This allows the customer to chamfer large workpiece lot sizes with the economical and fast ChamferCut process. However, if the workpiece lot sizes are very small, the FlexChamfer process can be used and the workpieces can be chamfered very quickly and flexibly. This is unique to this gear hobbing machine.

This is the chamfering process

After chamfering with the patented ChamferCut technology, no additional machining is necessary. The second hobbing cut, which is typically necessary when press deburring, is not necessary. The exact chamfer shape is generated by removing chips. In contrast to reshaping processes, there is no effect on the material structure. An optimal starting point is created for the subsequent finishing of hardened gears, particularly gear honing. This process is perfectly suited for very large batch sizes and quantities in mass production.

• Very precise chamfer geometry
• Premium chamfer quality and reproducibility
• No bulging or material deformation
• Tooth root chamfering as standard
• Established process in gear production
• Very long tool life
• ChamferCut tools can be easily and cost-effectively reground 15 - 20 times

In addition, we offer the new FlexChamfer technology. The gears can be chamfered quickly and efficiently using a standard shank hob. The movements of the tool are also fully NC-controlled, ensuring high repeatability and chamfer quality. This process is ideal for workpieces with interfering contours or when there is a very large part variance and small batch sizes.

• Flexible and universally applicable
• Easy programming in the control software LHGearTec
• Ideally suited for workpieces with interfering contours
• Precision chamfering geometries
• Highest reproductive accuracy
• Easy NC corrections possible
• Use of standard tools (available extremely quickly)