Galling mechanisms in sheet forming operations

Schedin, Erik

doi:10.1016/0043-1648(94)90229-1

Cited by 91 publications

(50 citation statements)

References 4 publications

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“…The understanding of friction is crucial in metal forming operations and is also an important input in simulations [3][4][5]. Kim and Suh [6] studied frictional forces generated by plowing of surfaces, where they concluded that it is extremely difficult to eliminate microstructural changes caused by mechanical interactions between the surfaces at a microscopic scale.…”

Section: Introductionmentioning

confidence: 99%

Studies on friction and transfer layer: role of surface texture

2006

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Friction influences the nature of transfer layer formed at the interface between tool and metal during sliding. In the present investigation, experiments were conducted using ''Inclined Scratch Tester'' to understand the effect of surface texture of hard surfaces on coefficient of friction and transfer layer formation. EN8 steel flats were ground to attain surfaces of different textures with different roughness. Then super purity aluminium pins were scratched against the prepared steel flats. Scanning electron micrographs of the contact surfaces of pins and flats were used to reveal the morphology of transfer layer. It was observed that the coefficient of friction and the formation of transfer layer depend primarily on the texture of hard surfaces, but independent of surface roughness of hard surfaces. It was observed that on surfaces that promote plane strain conditions near the surface, the transfer of material takes place due to the plowing action of the asperities. But, on a surface that promotes plane stress conditions the transfer layer was more due to the adhesion component of friction. It was observed that the adhesion component increases for surfaces that have random texture but was constant for the other surfaces.

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Section: Introductionmentioning

confidence: 99%

Studies on friction and transfer layer: role of surface texture

2006

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“…The adhered sheet material generates unstable frictional conditions, loss of dimensional tolerances and scratching of the workpiece/tool surfaces. Generally, galling is developed gradually with a stage, proceeding scratching, of transfer and build-up of adhered sheet material onto the tool surfaces [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Galling resistance and wear mechanisms – cold work tool materials sliding against carbon steel sheets

et al. 2006

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One of the major causes for tool failure in sheet metal forming is transfer and accumulation of adhered sheet material to the tool surfaces, generally referred to as galling. In the present work, the galling resistance of several tool materials was investigated against two-phase ferritic-martensitic carbon steel under dry sliding test conditions. Tribological evaluation was carried out at different contact pressures by using a slider-on-flat-surface (SOFS) tribometer. For all selected test conditions, a consistent ranking of the materials was obtained with best performance observed for nitrogen alloyed powder metallurgy tool steel. Worst galling resistance was observed by nodular cast iron.

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“…In general, significant improvements of the tool's life may be achieved by various surface modifications, where the most common is polishing of the tools to remove irregularities and coarse surface protrusions, which may act as initiation sites for work material transfer [8]. Further, by applying a protective coating on the tools surface, the occurrence of galling may be effectively delayed.…”

Section: Introductionmentioning

confidence: 98%

“…Several publications have been made where tool materials have been investigated regarding galling resistance [5,[8][9][10][11][12][13][14][15][16][17]. In general, significant improvements of the tool's life may be achieved by various surface modifications, where the most common is polishing of the tools to remove irregularities and coarse surface protrusions, which may act as initiation sites for work material transfer [8].…”

Section: Introductionmentioning

confidence: 99%

Wear Mechanisms in Galling: Cold Work Tool Materials Sliding Against High-strength Carbon Steel Sheets

2008

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Transfer and accumulation of adhered sheet material, generally referred to as galling, is the major cause for tool failure in sheet metal forming. In this study, the galling resistances of several tool steels were evaluated against dual-phase high-strength carbon steel using a SOFS tribometer, in which disc-shaped tools were slid against a real sheet surface in dry sliding test conditions. Three different frictional regimes were identified and characterized during sliding, and any transition in friction corresponded to a transition in wear mechanisms of the sheets. The performance of the tools depended on load, material and the particular frictional regime. Best overall performance was obtained by nitrogen-alloyed powder metallurgy tool steel.

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Galling mechanisms in sheet forming operations

Cited by 91 publications

References 4 publications

Studies on friction and transfer layer: role of surface texture

Studies on friction and transfer layer: role of surface texture

Galling resistance and wear mechanisms – cold work tool materials sliding against carbon steel sheets

Wear Mechanisms in Galling: Cold Work Tool Materials Sliding Against High-strength Carbon Steel Sheets

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