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

Abstract

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 stability. However, 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 issues. However, 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 die. Therefore, the appropriate DLC film properties for the contact state in microforming operation have not been clarified. To 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 camera. By using this system, the dynamic delamination behaviour of DLC films during the progressive micro-bending process was successfully demonstrated. The influential factors for the durability of DLC coated microdies were discussed.

In-situ measurement technologies for flow behaviour and contact status of fibre-reinforced thermoplastics during forming with a six degree of freedom press

“…From this overview thermocouples, load cells and a camera were chosen to observe the process, due to its simplicity of use. [4] Apart from the use in other research work, the utilization of a camera in [5] to observe a forming process is a promising approach. Shimizu et al [5] used a forming tool with transparent flank to observe the processes.…”

“…[4] Apart from the use in other research work, the utilization of a camera in [5] to observe a forming process is a promising approach. Shimizu et al [5] used a forming tool with transparent flank to observe the processes. In this work, the wear due to the contact between tool and sheet is examined.…”

“…In this work, the wear due to the contact between tool and sheet is examined. This setup from [5] could be the approach for the next attempt, if the experimental setup in this paper proves to be insufficient.…”