Advances in Dry Metal Forming Using Volatile Lubricants Injected Through Laser-Drilled Microholes
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Conventional production of deep-drawn parts requires lubricants to prevent damage to components and tools. These lubricants must be applied before forming and washed off afterwards to enable subsequent processes. Furthermore, some of these lubricants can be harmful to humans and the environment. To counteract these disadvantages, a new tribological system has been developed, using volatile media as lubricants. These media are injected directly into the friction zones via laser-drilled microholes integrated into the tool to reduce friction and prevent damage to contact surfaces. This article presents the latest findings from the field of ultrashort pulsed laser drilling, in which microholes with a depth of several millimetres and high aspect ratios are produced in hardened tool steel. Additionally, the latest advances in the characterisation of the novel tribo-system using stretch-bending tests will be shown, as well as investigations on the influence of surface properties on friction conditions.
KeywordsDry forming Deep drawing Friction investigations Ultrashort pulsed Laser drilling
The scientific investigations of this paper are funded by the German Research Foundation (DFG) within the priority program SPP 1676 Dry Metal Forming—Sustainable Production by Dry Processing in Metal Forming. We thank the German Research Foundation (DFG) for the funding of this research project.
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