Longitudinal Compensation Algorithm for the Stamping Fold Shift of Quadric Metal Curtain Walls

Abstract

Metal curtain walls are widely applied as decorative materials for the outer walls of large buildings. However, the application of such materials in curved building surfaces is relatively complicated. The whole curved surface is divided into several small surface patches according to a specific plan. Each surface patch is shaped by stamping with a certain-shaped plane metal plate. The calculation of the flat shape of a given surface patch is a key technology. Quadric surfaces are inextensible surfaces. Flat metal materials are folded when stamped into curved surfaces. Wrinkles are distributed unevenly because the curvature of surface patches is often asymmetric. Stress pushes wrinkles from high-density regions to low-density areas, at which point a uniform distribution pattern is reached under the limiting case. An accurate surface flattening method that compensates for fold shift is regarded as a difficult technology to develop. To address these problems, this study proposed an even flattening method for quadric surfaces. The proposed method simplifies the sheet metal forming technology and achieves satisfactory accuracy in the engineering process.