The framework of Petri nets is extended with imprecise temporal properties. Possibility theory is applied to model imprecise time by time-stamping tokens and assigning durations to firing of the transitions.

Within the Brite/EuRam project “DIGIMAN” a new optical measuring system for the assessment of sheet metal components in terms of shape accuracy and strain distribution has been developed. Based on the photogrammetrically measured geometric parameters of the object the system detects deviations from the desired geometry caused by springback and allows the strain analysis within critical stamping...

Replacement by aluminum for the closure panels is one of the common methods for lightening car body. However the application used to be limited into shallow drawing parts like hood because of its low stamping formability. As a solution to cover the low stamping formability of aluminum, Blow forming technology of aluminum which is one of the superplastic forming technologies has been researched ...

In the last few years, demand for hot stamped components has increased in automotive industry. Determination of formability under stamping is challenging due to elevated temperature, fast cooling, and high punch velocity. Although there was various strive determination, but were limitations with experiments like non-uniform heating specimen, strain, temperature distribution. Therefore, this wor...

Binary Linking Schemes (BLS) for digital time-stamping 3] provide (1) relative temporal authentication to be performed in logarithmic time, and (2) time-certiicates of reasonable size, which together with the data published in a widely available medium enable the veriier to establish their relative temporal positions, even if the database held by the Time-Stamping Service (TSS) ceases to exist....

The drawbeads in stamping tools are usually designed based on experience from the forming of steel. However, aluminium alloys display different forming behaviour to steels, which is not reflected in the drawbead design for tools used for stamping aluminium. This paper presents experimental results from different semi-circular drawbead geometries commonly encountered in automotive dies and compa...