Tribology in tool / material interface during forming

In micro/meso (between macro and micro)-scale metal forming, the contribution of friction between the tool and material on the material deformation is higher than that in macro-scale metal forming. The friction between tool and material in this scale is essentially nonuniform and nonconstant during forming. The interfacial phenomena including the friction force and adhesion were studied by the following method: direct measurement of friction force during forming, the atomistic calculation of ceramics/aluminum interface during forming, and the contact potential difference (CPD) measurement of tool surface after forming. The CPD measured on the tool surface can be compared with the electronic state calculated on adhered surface. © 2018 Japanese Society of Tribologists. All rights reserved.