Experimental Investigation of Frictional Resistances in the Drawbead Region of the Sheet Metal Forming Processes

2017 4th International Conference on Advanced Materials, Mechanics and Structural Engineering

材料科学;机械制造

Trzepiecinski, T.^1 ; Fejkiel, R.^2 ; Lemu, H.G.^3

Rzeszow University of Technology, Department of Materials Forming and Processing, al. Powst. Warszawy 12, Rzeszów

35-959, Poland^1

State School of Higher Vocational Education in Krosno, Rynek 1, Krosno

38-400, Poland^2

University of Stavanger, Department of Mechanical and Structural Engineering, Stavanger

N-4036, Norway^3

关键词: Experimental investigations;    Friction coefficients;    Friction conditions;    Frictional resistance;    Process parameters;    Real contact area;    Sheet deformation;    Sheet thickness;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/269/1/012042/pdf
DOI  :  10.1088/1757-899X/269/1/012042

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Drawbeads are used in sheet metal forming to restrain the sheet from flowing freely into die cavity, especially in the case of forming unsymmetrical drawpieces. This process is necessary to produce an optimal stamped part without wrinkles and cracks. In this paper, a special tribological simulator is used to evaluate the frictional resistances during flowing the sheet through the circular shape bead. The tests were conducted on DC04 carbon steel sheets with a sheet thickness of 0.8 mm. Experiments were carried out at different process parameters: friction conditions, specimen widths, heights and surface roughness of drawbead. The results obtained in the drawbead friction test show that the value of friction coefficient depends on the width of the sample. The character of sheet deformation during bending and reverse bending on the sheet thickness over the drawbead changes the surface topography and real contact area of sheet and tool.