Development of in-situ observation system of dynamic contact interface between dies and materials during microforming operation

Abstract

Application of diamond like carbon (DLC) films are reported in several microforming processes, in view of its great tribological performance owe to the low friction and the high chemical stabilityHowever, due to its high internal residual stress, the film properties with the low adhesion strength and the high wear rate under severe tribological conditions are still remain as technical issuesHowever, since the dynamic variation of the contact state cannot be observed during the forming operation, it is difficult to recognize the origin and the influential tribological factors of tool life for DLC coated microforming dieTherefore, the appropriate DLC film properties for the contact state in microforming operation have not been clarifiedTo observe the dynamic variation of the contact state during the microforming operation, present study developed a novel microforming die assembly installed the in-situ observation system with silica glass die and high speed recording cameraBy using this system, the dynamic delamination behaviour of DLC films during the progressive micro-bending process was successfully demonstratedThe influential factors for the durability of DLC coated microdies were discussed.