Hydrodynamic effects of macroscopic deterministic surface structures in cold forging processes

Groche, Peter; Stahlmann, Jörg; Hartel, Jürgen; Köhler, Michael

doi:10.1016/j.triboint.2009.03.019

Cited by 45 publications

(21 citation statements)

References 12 publications

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“…Groche et al [67,72] have studied the performance of different surface texturing methods of cylindrical QSt36-3 billets in a two-step forward cold extrusion lubricated with a reduction oil Bechem KFP 10 as substitute to phosphate coating and soap lubrication. Structuring was done by the following methods: shot blasting with different sized steel balls as well as Al 2 O 3 particles, laser structuring by a Nd:YAG laser with pulse and robot control and stochastic as well as deterministic electro-chemical etching.…”

Section: Examples On Application Of Structured Workpiece Surfacesmentioning

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: Examples On Application Of Structured Workpiece Surfacesmentioning

confidence: 99%

Environmentally benign tribo-systems for metal forming

et al. 2010

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“…To describe the evolution of the surface, the three-dimensional root mean square Sq of the profile was used [18], see Eq. (2),…”

Section: Numerical Setupmentioning

confidence: 99%

Prediction of the Evolution of the Surface Roughness in Dependence of the Lubrication System for Cold Forming Processes

et al. 2015

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Lubricants for cold forging operations do not only enable a reliable forging process, but also affect the results of forging processes. A sound lubrication decreases the occurring forces and may result in a smooth specimen surface. However, some lubricants are known to increase the initial surface roughness of the specimen as a consequence of the forming. Therefore, the decision which lubricant should be used is of special interest for near-net shape operations. The paper at hand presents the results of a finite element investigation of the first stage of an industrial rod extrusion process which was investigated with two different lubrication systems. The numerical investigations focus on a reliable prediction of the development of the surface roughness in due consideration of the lubricant.

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“…Friction conditions in forming processes can be determined and evaluated by friction tests like the pin extrusion test [7], the double cup extrusion test [1], the slide-compression test [8], or the barrel compression test [9]. In this paper, the barrel compression test was chosen to quantify the tribological impact of four differently finished tool surfaces.…”

Section: Introductionmentioning

confidence: 99%

Tribological impact of the finishing technology onto meso- and microforming processes

et al. 2016

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-Tribological conditions between workpiece and tool have a major impact onto forming processes. Besides lubrication, temperature, and material, they are mainly influenced by the tool surface characteristics, especially by its topography, which is a result of finishing technology. Thereby formed lubricant pockets are of prime importance for the tribosystem due to its ability to separate the tribopartners by storing lubricant. The influence of four different tool finishing processes and their according surface topographies onto frictional behaviour have been investigated and quantified by the barrel compression test, in dry and lubricated tribosystems. The tool steel surfaces were stochastically microstructured by grinding and spark erosion as well as deterministic structured with micro calottes, applied by jet electrochemical machining and compared to a polished reference tool. The allocation of open and closed lubricant pockets over tool surfaces before and after the forming process was analysed by a self-made MATLAB tool.

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Hydrodynamic effects of macroscopic deterministic surface structures in cold forging processes

Cited by 45 publications

References 12 publications

Environmentally benign tribo-systems for metal forming

Environmentally benign tribo-systems for metal forming

Prediction of the Evolution of the Surface Roughness in Dependence of the Lubrication System for Cold Forming Processes

Tribological impact of the finishing technology onto meso- and microforming processes

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