Visual comparison of multiple tonnage signatures by using snake skeleton graph

• Published in: Mechanical systems and signal processing Vol. 19; no. 2; pp. 311 - 328
• Main Authors: Xu, Diana, Liasi, Evangelos, Guo, Weizhong, Du, Ruxu
• Format: Journal Article
• Language: English
• Published: London Elsevier Ltd 01.03.2005; Elsevier
• Subjects: Applied sciences; Elasticity. Plasticity; Exact sciences and technology; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Physics; Sheet metal stamping; Snake skeleton graph; Solid mechanics; Structural and continuum mechanics; Tonnage signal analysis; Tonnage signal analysis; Snake skeleton graph; Sheet metal stamping; Transient response; Force measurement; Tree(graph); Die forging; Rupture; Unbalanced conditions; Forming; Bézier curve; Sheet metal; Signal processing; Signal analysis
• ISSN: 0888-3270; 1096-1216
• DOI: 10.1016/S0888-3270(03)00098-0

This paper presents a new method to represent the tonnage signatures from the sheet metal stamping operations. First, the new method, called the snake skeleton graph, is introduced. It uses Bézier surface to model the instantaneous stamping force distribution and hence, can capture the three-dimensional spatial features of the tonnage signatures, such as the imbalance of the transient forces. These features have clear physical meaning and can be used for diagnosing the stamping operations. Based on the study of two practical examples, a failure map is developed that can be used in shop floor applications.