چكيده به لاتين
Abstract:
In automobile industry, stamping of car body parts is one of the most important activities. This process is carried out by special and expensive dies in high quantity. In production line, there are various parameters affecting the quality of components. The most important of these parameters are low-level Stroke per Minutes (SPM) and low strain-hardenned parts. In this study, the defects in forming of Dena outer door hood were investigated. The process was simulated by Autoform commericial software to study the strain distribution and unstretched sections. Then, the modification of relevant die was carried out to remove the defects. In the simulation, firstly the 3D model file of previous die geometry, punch and blank holder were prepared in Catia software and then simulation procedure was implemented in Autoform software. The experimental thickness measurement at different points was done by using ultrasonic apparatus. A good agreement was found between numerical and experimental results. The modified geomtery was also simulated by Autoform software with necessary changes of forming parameters such as blank holder force, friction coefficient, and draw bead positions. The final outcome of the results show that modification are successful and adjustment of forming parameters could provide an appropriate conditions for producing this part with higher SPM and without unstreched sections.
