Download Grundlagen der Umformtechnik — Stand und Entwicklungstrends by Prof. Dr.-Ing. Kurt Lange (auth.) PDF

By Prof. Dr.-Ing. Kurt Lange (auth.)

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Read or Download Grundlagen der Umformtechnik — Stand und Entwicklungstrends / Fundamentals of Metal Forming Technique — State and Trends: Vorträge des Internationalen Symposiums Stuttgart, 13./14. Oktober 1983 Teil I / Proceedings of the International Symposium Stuttgart PDF

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Additional resources for Grundlagen der Umformtechnik — Stand und Entwicklungstrends / Fundamentals of Metal Forming Technique — State and Trends: Vorträge des Internationalen Symposiums Stuttgart, 13./14. Oktober 1983 Teil I / Proceedings of the International Symposium Stuttgart

Example text

6. Two sets of coordinate systems, (X, Y, I) and (X', yl, I') are considered. The force acting at a contact point is Fn, the projection of the frictional force Ft on the plane X' - Z' is T and F't is the projection of Ft on the X - Y plane. = )( ~Y F. )} anglesel,92 and e3 are expressed in terms of the coordi nates of a The Y, Z) and the displacements of the point (u, V, W). contact poi nt (X, z t z,Z' I, f'l, Lx. Figure 6 y x' y' Tractional boundary condition for the node in contact with the punch head.

Hecker [15] used the method to determine the forming limit curves of aluminum alloys and aluminum-killed steels. 8 mm Two sets of computations are carried out. 2. Figure 10 illustrates the portion of sheet domain used in the computation. The thickness strain distributions at various punch depths are shown in Fig. 11. The effect of friction can be seen in the strain distributions in the region where the strip is in contact with the punch. However, the location of the critical site for failure is not affected by the friction condition, because maximum thinning occurs at the element 21 (see Fig.

He proceeded to analize the cold backward can extrusion [11] using the same method and the velocity field proposed by Dipper in 1949. Though there was an unsound treatment of Coulomb's friction, the experimentally and analytically determined extrusion pressures and flow patterns showed good agreement (Fig. 2). ••••••••• ....... photographed ca1~ulateG Fig. 2: Comparison of Deformation Patterns Calculated by UBA and Photographed with Lead Specimen [11] - 63 - Kudo [17, 18J. By the use of velocity fields that allowed skin inclusion, material separation from tool surface or internal material separation or fracture and resulted in lower upper bounds than those of sound deformation, Kudo and Johnson even predicted the occurance of those material defects, see Fig.

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