Kwan-Do Hur

TL;DR: In this article, a design method that makes the elastic deformation of the prestressed die as small as possible has been proposed for precision cold forging, applying the hard materials such as sintered carbide to the first stress ring is considered in die construction, and the diameter ratios and interferences are determined by using the maximum inner pressure without yielding of rings after shrink fitting and during cold forging.

TL;DR: An upper bound elemental technique (UBET) has been proposed for the design of the flash gap in closed-die forging operations of axisymmetric shapes as discussed by the authors, and the developed method has been applied to analyze the forging load, die-cavity filling, and effective strain and strain rate distributions.

TL;DR: In this article, sintered carbide is considered as the materials of the first stress ring to increase the stiffness of the prestressed die, and the radial displacements on the inner surface of the die insert for several die configurations were analyzed by the elastic FE-analysis.

TL;DR: In this article, the experimental result and theoretical analysis result to investigate the correlation between the operating force, angle and locking torque for vehicle hood frame are presented. But the experimental equation of the locking torque prediction for the hood frame is derived only for experiment and theory analysis.