A Basic Study of the Influence of Surface Topography on Mechanisms of Liquid Lubrication in Metal Forming

Sorensen, Caroline; Bech, Jakob Ilsted; Andreasen, Jan Lasson; Bay, Niels; Engel, Ulf; Neudecker, T.

doi:10.1016/s0007-8506(07)63166-7

Cited by 40 publications

(22 citation statements)

References 9 publications

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“…In [163] Otto et al report the relationship between flank angle of the single texture element and relative tool life, see Fig. 33, in good accordance with the earlier mentioned importance of the slope of the pocket wall in textured sheet blanks, [188]. Adjustment of the flank angle is achieved by laser texturing with controlled defocusing.…”

Section: Surface Textured Cold Forging Toolssupporting

confidence: 62%

“…29. Adopting the same direct observation technique as Azushima, Bay et al [26,188] carried out a larger series of experiments with varying pocket geometry as well as lubricant viscosity, reduction and drawing speed. They established a theoretical model for the threshold reduction to onset of lubricant escape and showed that this was strongly dependent on the slope of the pocket wall, see Fig.…”

Section: Metal Forming Lubrication Mechanisms Applying Structured Surmentioning

confidence: 99%

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Environmentally benign tribo-systems for metal forming

et al. 2010

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The growing awareness of environmental issues and the requirements to establish solutions diminishing the impact on working environment as well as external environment has initiated ever increasing efforts to develop new, environmentally benign tribological systems for metal forming. The present paper gives an overview of these efforts substituting environmentally hazardous lubricants in cold, warm and hot forging as well as sheet forming and punching/blanking by new, less harmful lubricants and furthermore describes other more generic measures directed towards the same goal such as development of anti-seizure tool materials and coatings and application of structured workpiece and tool surfaces.

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Section: Surface Textured Cold Forging Toolssupporting

confidence: 62%

Section: Metal Forming Lubrication Mechanisms Applying Structured Surmentioning

confidence: 99%

Environmentally benign tribo-systems for metal forming

et al. 2010

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“…On tailored surfaces, defined geometric structures, which act as lubrication pockets, will be applied in a determined pattern. Sørensen et al [6] came to the conclusion, that there is a close relation between the geometry of lubricant pockets and the tribological behavior. Hence, by knowing this relation, it should be achievable to realize areas with different structures and thus different frictional behavior.…”

Section: Tribology and Tailored Surfacesmentioning

confidence: 99%

Manufacturing of complex functional components with variants by using a new metal forming process – sheet-bulk metal forming

et al. 2010

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Nowadays, traditional sheet metal and bulk metal forming processes are often reaching their limits, particularly in the automotive sector, if closely-tolerated complex functional components are required. In this paper, an approach for the direct forming of high-precision shapes starting from blanks will be presented and fundamentally analyzed. Aim of this new process-class, named "sheet-bulk metal forming", is the direct forming of functional components with variants out of the sheet. In a first step, the complex interactions between regions of high and low strains, which are characteristic for sheet-bulk metal forming, have been investigated by simulations. Based on the identified process characteristic, new tool geometries and forming strategies for extrusion and deep-drawing processes have been developed to fine-control the local material flow for a defined filling of the target regions. A further enhancement of the mold filling can be achieved by a predistribution of material using tailored blanks with a defined varying thickness where material is transferred to its target regions to adjust special local mechanical properties. In the paper it will be also exemplified, that the desired process behaviour can be supported by local increased friction provided by tailored surfaces.

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“…The resulting surface has a plateau area capable of carrying loads and deeper, crossed valleys able to store and provide extra lubrication [5][6][7][8]. Numerous shapes, sizes and distributions of the lubricant reservoirs have been under the attention of researchers all over the world [9][10][11][12][13][14][15][16][17]. Grooves, dimples, herringbone patterns and crossed texture have all shown promising results in terms of reduction of the friction coefficient both in machine element and metal forming applications [9,[13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Testing of Newly Developed Functional Surfaces Under Pure Sliding Conditions

Godi

Mohaghegh

Grønbæk³

et al. 2013

Tribol Lett

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The employment of surface texturing for improved tribological contacts has spread over the years. The possibilities of designing and manufacturing textured surfaces with predetermined geometries have multiplied as well as the need of performing experimental laboratory tests before applying the surfaces in an industrial context. In this paper a number of experimental tests were performed using a novel test rig, called Axial Sliding Test, simulating the contact of surfaces under pure sliding conditions. The aim of the experiments is to evaluate the frictional behavior of a new typology of textured surfaces, the so-called multifunctional surfaces characterized by a plateau area able to bear loads and a deterministic pattern of lubricant pockets. Six surface typologies, namely three multifunctional and three machined using classical processes were chosen to slide against a mirror-polished counterpart. A number of experiments were carried out at different normal pressures employing for all specimens the same reciprocating movement and the same lubrication. The measured friction forces were plotted against the incremental normal pressure and the friction coefficients were calculated. The results comparison showed clearly how employing multifunctional surfaces can reduce friction forces up to 50% at high normal loads compared to regularly ground or turned surfaces. Friction coefficients approximately equal to 0.12 were found for classically machined surfaces, whereas the values were 0.06 for multifunctional ones. All the specimens were characterized before and after testing. Wear occurrence was not detected on the tested surfaces except on the mirror-polished one which underwent all the experiments.

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A Basic Study of the Influence of Surface Topography on Mechanisms of Liquid Lubrication in Metal Forming

Cited by 40 publications

References 9 publications

Environmentally benign tribo-systems for metal forming

Environmentally benign tribo-systems for metal forming

Manufacturing of complex functional components with variants by using a new metal forming process – sheet-bulk metal forming

Testing of Newly Developed Functional Surfaces Under Pure Sliding Conditions

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