The objective of this paper is to investigate the effect of stamping process on oil canning and dent resistance performances of an automotive roof panel. Finite element analysis of stamping processes ....
Die wear is a significant issue in sheet metal forming particularly for stamping Advanced High-Strength Steels (AHSS) because of their higher strength and microstructure composition. Reliable predicti....
More and more advanced high strength steels (AHSS) such as dual phase steels and TRIP steels are implemented in automotive components due to their superior crash performance and vehicle weight reducti....
Draw beads are used in many stamping dies to control the flow of metal into a die cavity. The multiple bends imposed by the draw beads cause a change in the mechanical properties of the sheet before i....
Dual phase steels are becoming increasingly popular choices for automotive structural applications at General Motors (GM) due to their strength and relatively good formability. Coming with it is the c....
The accurate prediction of burst of hydroformed tubes is a research area of considerable importance in order to evaluate a design before prototyping. This report applies the presently available criter....
As a virtual manufacturing press line, line die forming simulation provides a full range math-based engineering tool for stamping die developments of automotive structure and closure panels. Much beyo....
In this paper, the factors that affect the accuracy of springback prediction are discussed. Springback predictions of aluminum and high strength steel panels are compared with measurement data. The ef....
The calibration of yield functions for numerical sheet forming simulations is done using different experimental approaches such as the uniaxial tensile test, the bulge test, etc. How accurately the ma....
In this period of hyper competition, time to market is a key success component. All development cycles are being compressed and the surface development process is no exception. Therefore, it has becom....
A procedure for the measurement of stamping die strains encountered during stamping operations is documented in this study. The design of stamping die press components has, in the past, been primarily....
In the past few years, GM manufacturing is streamlining its efforts to win total manufacturability in stamping process. One of the major efforts is optimizing the stamping die structures to reduce the....
Since 1997, General Motors Body Manufacturing Engineering - Die Engineering Services (BME-DES) has been working jointly with our software vendor to develop and implement a parallel version of stamping....
The paper discusses the results obtained by the application of the roll forming technology on the production of a high precision metal motor housings. In particular, it is explained a process that all....
Superplastic forming (SPF) is a manufacturing process that can facilitate increased use of aluminum in automobile body structures. Despite considerable advantages with regards to formability and tooli....
Laminated steel has been increasingly applied in automotive products for vibration and noise reduction. One of the major challenges the laminated steel poses is how to simulate forming processes and p....
Bulb shields are important components in automobile headlamps and are primarily manufactured by progressive draw dies. Among progressive forming, multiple station progressive draw dies are the most fo....
The bending fatigue performance of high temperature (1050 °C) vacuum carburized Nb modified 8620 steel, with niobium additions of 0.02, 0.06 and 0.1 wt pct, was evaluated utilizing a modified Brugger ....
A series of bending fatigue tests were conducted and S-N data were obtained for two groups of 4320 steel samples: (1) carburized, quenched and tempered, (2) carburized, quenched, tempered and shot pee....
The effect of B and Si additions on fracture and fatigue performance of vacuum carburized 4320 steel and modifications of 4320 steel containing additions of Si (1.0 and 2.0 wt pct) and B (0 and 17 ppm....
