Jichang Yang

Controlled FEM simulation ways of blank holding force in sheet metal forming process

A new scheme for blank holding force (BHF) is introduced in order to apply more realistic BHF in simulation. The present study has been carried out for deep drawing processes of a washing‐trough. Different blankholder gaps and separation forces simulate the blank holding process. The optimum blankholder gap and separation force are determined through a systematic approach. It is found that the wrinkling in the flange region of the blank increases with the augmentation of the blank holder gap. And the BHF increases owing to the elevation of the rigidity of the sheet metal. The simulated thickness with separation force is lower than that with the blankholder gap because the BHF is variable in the flange region. A comparison of the thickness and flange contour between the simulation results and experiment shows that the blankholder gap is better in the simulation of the BHF in sheet metal forming process.

Movement control of forming by laser shock wave

Laser Shock Forming (LSF) is a new forming method for sheet metal, and a settle of LSF equipment carry out technics and forming process, which are made up of high power pulse laser, 5-axis coordinated movement worktable, Industrial Personal Computer, SERCOS field bus and control software etc. In order to satisfy request to adjust the work surface which needs forming to be perpendicular to laser beam, put forward a kind of new B-spline interpolation arithmetic for 5-axis movement, and according to emulation by MATLAB, it testified that maximum error when interpolated a dimensional curve was not more than one micron if instruction speed is 600 millimeters per second.