Research On Simulation Technology Of Sheet Metal Based On Optical Measurement

The increasing maturity of commercial finite element software promotes the application of numerical simulation technology in the sheet metal industry extensively, which has gradually become an indispensable tool for the future development of manufacturing industry in China. The comprehensive strength and market competitiveness of enterprises are promoted largely by the research on influence of various parameters to the quality of products by finite element simulation technology. As the directly evaluation criterion for the parts, the forming limit diagram play an essential role in the stamping industry. The way to get the strain distribution with high efficiency and precision is considered as a key factor to judge the formability of the parts. The development of grid strain technology provides a method for the strain measurement, especially, emerge of optical strain measurement technology reduces the time and cost greatly during the strain detection process.Based on the optical measurement technology, a scheme of mold detection is put forward in the view of the actual production. A re-development for the defect of optical measurement software ARGUS is conducted, which takes Python as a tool. To judge the quality of parts, corresponding material parameters are entered into the graphical user interface, as the empirical formula method to generate forming limit curve if there is no experimental data; Key stage points and the parameters information of points cloud are also exported; finally, detection reports are also generated rapidly by means of the re-development on report-module of ARGUS. Then taking a hood inner as example, the simulation research of formability is studied based on AUTOFORM and the forming quality is detected by ARGUS, deviations between simulation and experimental results are compared. The accuracy of simulation is increased greatly by iterating modify the simulation parameters. The feasibility of the modification of the process plan is verified, which effectively avoid the process of repairing the mold again and again, it is a theoretical basis for the mold detection and the parts production.The re-development for the key technologies of ARGUS is applied to the production successfully, which greatly improves the mold detection scheme. The organic combination among mold simulation, optical measurement as well as the mold detection lead to the formability and the precision of the simulation increased effectively.