Effects of Lubricant Viscosity at Pressure and Sliding Velocity on Lubricating Conditions in the Compression-Friction Test on Sheet Metals

Mizuno, Takaji; Okamoto, Miki

doi:10.1115/1.3253164

Cited by 70 publications

(23 citation statements)

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“…This mechanism was first proposed Mizuno and Okamoto [134], who named it MicroPlasto HydroDynamic Lubrication (MPHDL). In studies of plane strip drawing of aluminum provided with artificial lubricant pockets by local indentation with a Vickers pyramid Azushima et al [12,13] verified the proposed mechanism by direct observation of the tool/workpiece interface through a transparent die.…”

Section: Metal Forming Lubrication Mechanisms Applying Structured Surmentioning

confidence: 99%

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: Metal Forming Lubrication Mechanisms Applying Structured Surmentioning

confidence: 99%

Environmentally benign tribo-systems for metal forming

et al. 2010

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“…The concept of Micro Plasto Hydrodynamic Lubrication (MPHL) was proposed by Mizuno [1], and later supported by Kudo et al [2]. Azushima et al [3] and Bech et al [4] proved the concept in plane strain reduction of aluminium strips provided with pyramidal indentations filled with lubricant.…”

Section: Introductionmentioning

confidence: 95%

Analysis of fluid lubrication mechanisms in metal forming at mesoscopic scale

Dubar¹,

Hubert²,

Christiansen³

et al. 2012

CIRP Annals

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The lubricant entrapment and escape phenomena in metal forming are studied experimentally as well as numerically. Experiments are carried out in strip reduction of aluminium sheet applying a transparent die to study the fluid flow between mesoscopic cavities. The numerical analysis involves two computation steps. The first one is a fully coupled fluid-structure Finite Element computation, where pockets in the surface are plastically deformed leading to the pressurization of the entrapped fluid. The second step computes the fluid exchange between cavities through the plateaus of asperity contacts with the plane tool, one cavity at a time.Metal forming, fluid lubrication mechanisms, analysis on mesoscopic scale

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“…The entrapment and escape of liquid lubricant from closed lubricant pockets have been investigated and described with the concepts of micro plasto hydrodynamic lubrication (MPHDL) and hydrostatic lubrication (MPHSL) by Mizuno and Okamoto [13], Kudo et al [14], Azushima et al [15] and Bech et al [16].…”

Section: Introductionmentioning

confidence: 99%

Basic investigations on boundary lubrication in metal forming processes by in situ observation of the real contact area

Weidel

Engel

Merklein

et al. 2009

Prod. Eng. Res. Devel.

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In metal forming processes tribology plays a significant role for process feasibility and tool lifetime. Boundary and mixed lubrication conditions are predominant in metal forming processes. Hence the appearing real contact area which is mainly influenced by the topography of tool and workpiece has a major impact on friction conditions. For an improved understanding of friction at the interface between tool and workpiece, the flattening behavior of idealized asperities under boundary lubrication conditions is investigated by applying a translucent tool. Various liquid lubricants have been used. It has been revealed that the usage of certain lubricants leads to higher resistance of the asperity against flattening which would be in favor of reduced friction. Topography analysis and finite element simulations have been performed in order to get more insight into the mechanisms leading to this effect. The findings have been transferred to real topographies by micro upsetting tests with ground surfaces.

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Effects of Lubricant Viscosity at Pressure and Sliding Velocity on Lubricating Conditions in the Compression-Friction Test on Sheet Metals

Cited by 70 publications

References 0 publications

Environmentally benign tribo-systems for metal forming

Environmentally benign tribo-systems for metal forming

Analysis of fluid lubrication mechanisms in metal forming at mesoscopic scale

Basic investigations on boundary lubrication in metal forming processes by in situ observation of the real contact area

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