Textured surfaces for deep drawing tools by rolling

Franzen, Volker; Witulski, J.; Brosius, Alexander; Trompeter, Michael; Tekkaya, A. Erman

doi:10.1016/j.ijmachtools.2010.08.001

Cited by 40 publications

(19 citation statements)

References 7 publications

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“…1 Selective surface texturing on the tool surfaces in parallel, perpendicular and zigzag orientation corresponding to the material flow direction [29] forming speed of 600 mm/s and a total stroke of 100 mm. The tool used for the tests is shown in Fig.…”

Section: Experimental Set-up and Tool Preparationmentioning

confidence: 99%

“…Compared with micro-scale surface textures, little research has been carried out on macro-scale surface textures for stamping. Franzen et al [29] investigated friction coefficient at the tool/work-piece interfaces using selective texturing on the tool surfaces as shown in Fig. 1, a significant increase in friction coefficient was found due to the material elastic deformation near the texture area and local plastic deformation on the sheet surface.…”

Section: Introductionmentioning

confidence: 99%

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An experimental and numerical investigation of the effect of macro-textured tool surfaces in hot stamping

et al. 2015

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This paper presents a method of increasing drawability of materials in hot stamping processes using forming tools with macro-scale textures on the tool surfaces. Firstly, a series of tool texture designs and orientations were presented and a test programme was designed for the experimental investigation. Top-hat shape drawing experiments in cold and hot stamping conditions were conducted to evaluate the effect of macro-scale tool surface textures on the material drawing. Texture directional and texture feature effects of the blankholders on the draw-ability of the material have been investigated. A finite element model of the top-hat drawing process with textured tool surfaces has been established and validated from experimental data. Further FE process modelling has been carried out and the effects of texture features and forming speed have been studied. The relationships between texture designs and material drawing results have been analysed. The developed FE model can provide a guide to design the geometry of tool textures and optimise the hot stamping process parameters.

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Section: Experimental Set-up and Tool Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An experimental and numerical investigation of the effect of macro-textured tool surfaces in hot stamping

et al. 2015

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“…Drawing tools exhibiting grooves perpendicular to the drawing direction of the sheet material lead to an elastic deformation of the work piece material and allow for an increase of friction. 13 Such grooves can be characterized as mesoscopic structures with a feature size of about 30 micrometers to about 200 micrometer. Microscopic structures, e.g.…”

Section: Structured Tool Surfacesmentioning

confidence: 99%

Dry rotary swaging–approaches for lubricant free process design

Böhmermann

Hasselbruch

Herrmann

et al. 2015

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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“…Compared with the extensive research on microtexturing of tool surfaces, limited research has been performed for macro-scale surface texturing. Franzen et al [8] investigated the tribological performance of macroscopic textured tool surfaces using strip-drawing process. The textured macro-scale tool surfaces can increase the interficial friction coefficient compared to flat tool surfaces, which might be a potentional approach to replace conventional draw beads for sheet stamping.…”

Section: Introductionmentioning

confidence: 99%

An analytical investigation on the wrinkling of aluminium alloys during stamping using macro-scale structural tooling surfaces

Zheng

Lee

Politis

et al. 2017

Int J Adv Manuf Technol

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Structural surface texturing is believed to be a promising approach to modify tribological and thermal performances of tooling for sheet-stamping processes. However, a fundamental study on the surface-texturing design and resulting material deformation is currently lacking. In this paper, an advanced analytical buckling model specifically for the utilisation of textured tools at macro-scale, comprising dislocation-driven material model, isotropic yield criteria, bifurcation theory and Donnell-Mushtari-Vlasov (DMV) shell structure theory, was established. The developed analytical buckling model was validated by cylindrical deep-drawing experiments. Further finite element (FE) simulations with the implementation of material model via user-defined subroutine were also used to validate the bucking model for large surface texture designs. Effects of theoretical assumptions, such as yield criterion, boundary condition and test-piece geometry, on the accuracy of model prediction for wrinkling were investigated. It was found that the von Mises yield criterion and hinged boundary condition exhibited more accurate predictions. In addition, the DMV shell theory made this model most representative for large structural texturing designs. Furthermore, the implementation of induced shear strain component has an important effect on precisely predicting the wrinkling occurrence. The advanced analytical models developed in this study combine various classical mechanics, structure stability and material modelling together, which provides a useful tool for tooling engineers to analyse structural designs.

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Textured surfaces for deep drawing tools by rolling

Cited by 40 publications

References 7 publications

An experimental and numerical investigation of the effect of macro-textured tool surfaces in hot stamping

An experimental and numerical investigation of the effect of macro-textured tool surfaces in hot stamping

Dry rotary swaging–approaches for lubricant free process design

An analytical investigation on the wrinkling of aluminium alloys during stamping using macro-scale structural tooling surfaces

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