Abstract
Liquid lubricant is widely used in macro sheet forming. However, it is not wise to use liquid lubricant for micro sheet forming because of friction size effects. Three kinds of solid lubrication films were proposed to treat SKD11 sample in this study. TiN and diamond-like carbon (DLC) films were fabricated by plasma immersion ion implantation and deposition (PIIID). However, MoS2 film was fabricated by magnetron sputtering. Raman spectrum, X-ray diffraction (XRD), atomic force microscope (AFM), ball-on-disc test and scratch test were used to investigate the structure, tribological property, and adhesion strength of the films. The results showed that comprehensive properties of the DLC film were much better than TiN and MoS2 films and can be chosen as a suitable lubricant for micro sheet forming. To further investigate the effect of DLC film to micro sheet forming, a micro deep drawing experiment was carried out by using a DLC film-coated micro blanking-deep drawing multiple operation mould. The results showed that the limiting drawing coefficient (LDC) and drawing force were dramatically decreased.
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