Cutting performance and wear morphology in re-coated hob for dry machining

The gear cutting for the automotive industry must guarantee the part quality and machining time, which are requirements of design and production respectively. Wet machining is well known to be able to achieve these requirements so the producers usually exploit lubricants in their machining operations. Nevertheless, dry machining reduces cost for waste disposal and national and local governments encourage its use, which also has a positive impact on the environment. In this paper the influence of coating on tool performance sand its wear morphology were investigated during gear cutting under dry condition. A new coating layer was deposited after grinding the worn out surfaces of the teeth. It was shown that the performance of the hob was highly affected by the recoating and the.