Influence of unloading time on the residual curvature of a part after conjugate bending of a sheet billet on rolls with an elastic coating

The influence of the viscous properties of elastoplastic materials on the springing during unloading of parts bent according to the conjugate scheme on a two-roll machine with an elastic coating of the lower roll is studied. Keywords bending, sheet metal, springing, unloading time, viscosity coefficient. [email protected]

Assessing the Metal Consumption for Manufacturing a Conical Part by Hollow Billet Crimp-Expansion and Sheet Blanks Drawing Crimping

The process of hollow conical forming is described for two schemes: crimp-distribution for hollow billets and stretching from sheet billet with subsequent crimping for cylindrical blank. The item thickness varying was investigated for these schemes. Dependency of technological allowance ratio on crimping coefficient and expansion ration for items allowance was investigated. The effectiveness of stretching from sheet billet with subsequent crimping was proven.

A Simplified Correction for Surface Roughness Effects in X-Ray Diffractometric Investigations

The importance of surface roughness to the measurement of integrated intensity in X-ray powder diffraction is discussed following studies conducted with materials in both powder and bulk (rolled sheet/billet) forms possessing different absorption characteristics. A simple procedure is described which allows for surface roughness effect.