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Content archived on 2024-04-19

High precision shave-grinding system for single step hard finishing operations of gears

Exploitable results

The research and development activities of the project will provide the basic technological parameters for grinding at low speed with a main emphasis on gears. The results lead to a new precision machining technology for the shave-grinding process of gears (including tools and process strategy). Additionally an optoelectronic system, which contains a charge coupled device (CCD)-camera, structured light and specific hardware/software will be connected to the machine to solve in process detection of surface defects. The work package will be done in a generic way so that a transferability to other products and branches is ensured.
Shave grinding (power honing) is a new technology for the hard finishing of gears. The technology is a new approach with high potential because it is free from thermal influence on the subsurface and produces a favourable surface texture. The research work included modelling the shave-grinding process allowing design of a suitable test bench. For the visualization of the shave grinding process the software VIRTUAL-NC from DENEB ROBOTICS has been used. The visualization could be enhanced easily to include the machine attachments. The following achievements resulted from the work: constraint model of parameters for shave-grinding process; test bench for new shave-grinding ring specifications; recommendations on shave-grinding tool performance for commonly used tool specifications; improvement of existing shave-grinding tool specification and development of new specification; graphic visualization of shave-grinding process; laboratory set up for visual inspection of helical gear wheels. As consequence of the improvements the shave-grinding process can be conducted in a more stable way. This leads to shorter cycle times and tool cost. The economic advantage can be estimated to 20-30% of the cost of the operation. Gears machined under above mentioned conditions do have a very favourable noise behaviour compared to gears machined with any other known finishing method. This shows that shave grinding today can be considered as a technology which gives, as far as gear noise is considered, results at a very reasonable cost level that can not be achieved with any other process. New environmental laws require a new generation of engines, especially in the truck industry, with a considerably reduced noise level.

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