At IMTS 2018, Liebherr Gear Technology will demonstrate its gear skiving process on its LK series machines based on the tried-and-tested components of the corresponding large hobbing machines but equipped with greater rigidity and more powerful spindles. A gear skiving machine requires a table with a direct drive owing to the high workpiece speeds required. This drive works with an automatic control that constantly has the optimal parameters. The complex clamping fixture, which links the workpiece and the machine, is designed by Liebherr.
As skiving is a highly dynamic process, the machine is supplied on a ‘turnkey’ basis with individual clamping fixtures for each workpiece, precise rigidity, and contour accuracy. “This overall view is an important part for the production success,” said Siegfried Schmidt, team leader in Development and Design of Skiving. “A complex process such as skiving has many specific obstacles, which we overcome with very specific mathematical solutions.”
With its skiving3 program, Liebherr not only provides the LK 300 or 500 skiving machine, but a whole process, including machine, tools, and technology for gear production. This integrated approach from Liebherr has already been tried and tested in practice. For many customers, the process of skiving is new, and therefore the operators of the machines need comprehensive training and assistance. On top of that, the tool design is a very complex issue
Skiving3 is popular especially for internal gearing with medium size and quantity as it is much faster than shaping and more economical than broaching. In situations where gear skiving is not possible or appropriate, owing to interfering contours or quantities that are too low, Liebherr still offers technological alternatives with gear shaping and gear hobbing.
The newly developed LHGe@rTec control system also contains the mathematical formulas for pressure angle corrections. This way, quality improvements can be easily achieved via the kinematics of the machine.
The optional tool changer, which can be used to change between roughing and finishing tools, for example, is new. Liebherr offers a ringloader as a standard option for the workpiece changing device; other automation solutions, such as belts and robots, can also be realized upon request.
Machine overview:
LK 300/500
- Maximum module: 5
- Maximum gearing diameter: 300 / 500 mm
- Maximum workpiece outside diameter: 500 / 600
- Maximum table speed: 3000 / 1500 1 / min
- Maximum tool diameter: 250 mm
- Maximum tool speed: 2700 rpm
- Maximum spindle output: 32 kW
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