Pre-selection of laser-processed materials for dry forming tools by means of a dry oscillating ball-on-disc test

Schwander, Michael; Fuller, D. H.; Köhler, Henry; Feuerhahn, F.; Silva, M. Dias da; Prieske, M.; Vollertsen, Frank

doi:10.1007/s11740-014-0554-y

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…The same aluminum bronze was cladded. However, aluminum alloy 6082 acted as a substrate material and Si 3 N 4 ball was the counter body [11]. To understand the influence of the steel substrate on the tribological behaviour, WDS measurements were carried out in the aluminum bronze clads on steel.…”

Section: Discussionmentioning

confidence: 99%

“…The oscillating ball-on-plate test can be applied to characterize and to assess the behaviour of tool surfaces in dry sliding. The friction coefficient and wear of various material combinations can be evaluated very quickly and in a simple way by this test method [11]. By the German Association for Tribology, the different tribological tests can be structured in six categories of test methods with different levels of abstraction [12].…”

Section: Introductionmentioning

confidence: 99%

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Investigations on dry sliding of laser cladded aluminum bronze

et al. 2016

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-The aim of this study was to investigate the tribological behaviour of laser cladded aluminum bronze tool surfaces for dry metal forming. In a first part of this work a process window for cladding aluminum bronze on steel substrate was investigated to ensure a low dilution. Therefore, the cladding speed, the powder feed rate, the laser power and the distance between the process head and the substrate were varied. The target of the second part was to investigate the influence of different process parameters on the tribological behaviour of the cladded tracks. The laser claddings were carried out on both aluminum bronze and cold work tool steel as substrate materials. Two different particle sizes of the cladding powder material were used. The cladding speed was varied and a post-processing laser remelting treatment was applied. It is shown that the tribological behaviour of the surface in a dry oscillating ball-on-plate test is highly dependent on the substrate material. In the third part a deep drawing tool was additively manufactured by direct laser deposition. Furthermore, the tool was applied to form circular cups with and without lubrication.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigations on dry sliding of laser cladded aluminum bronze

et al. 2016

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“…The challenge is to understand the dry sliding process for a defined material combination and to modify the tool surfaces accordingly. To evaluate the tool in dependence of the sheet material for dry forming, an eligibility number can be applied [2]. Reducing the wear and the friction coefficient is the target for current investigations to integrate dry metal forming in industrial mass production.…”

Section: Introductionmentioning

confidence: 99%

Dry metal forming of high alloy steel using laser generated aluminum bronze tools

Freiße

Köhler

Seefeld

et al. 2015

MATEC Web of Conferences

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Abstract. Regarding the optimization of forming technology in economic and environmental aspects, avoiding lubricants is an approach to realize the vision of a new green technology. The resulting direct contact between the tool and the sheet in non-lubricated deep drawing causes higher stress and depends mainly on the material combination. The tribological system in dry sliding has to be assessed by means on the one hand of the resulting friction coefficient and on the other hand of the wear of the tool and sheet material. The potential to generate tailored tribological systems for dry metal forming could be shown within the investigations by using different material combinations and by applying different laser cladding process parameters. Furthermore, the feasibility of additive manufacturing of a deep drawing tool was demonstrated. The tool was successfully applied to form circular cups in a dry metal forming process.

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“…In Dry Metal Forming processes lubricants are not applied, so a cleaning of the tools and a waste disposal is not necessary [1]. Ball-on-disc tests show that the material selection and processing have a significant influence on the wear behaviour of tools under Dry Metal Forming conditions [2]. Especially diamond coatings are able to decrease the coefficient of friction.…”

Section: Introductionmentioning

confidence: 99%

Agglomerated Tungsten Carbide: A New Approach for Tool Surface Reinforcement

Ditsche

Seefeld

2019

KEM

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For the first time tungsten carbide particles were deliberately agglomerated by two-step laser melt injection. After a regular laser melt injection, a second laser melt injection was performed with additional tungsten carbide particles in order to generate a large local agglomerate. The influence of laser power, laser spot diameter, powder feeding rate and pulse time on the agglomeration process was examined and depended on the energy input and tungsten carbide quantity introduced into the metal matrix composite surface. Chemical composition of the agglomerates corresponded with the values of tungsten carbide and the agglomerate hardness was slightly lower. It is intended to apply this agglomerated tungsten carbide for deep drawing tools under Dry Metal Forming conditions.

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Pre-selection of laser-processed materials for dry forming tools by means of a dry oscillating ball-on-disc test

Cited by 6 publications

References 7 publications

Investigations on dry sliding of laser cladded aluminum bronze

Investigations on dry sliding of laser cladded aluminum bronze

Dry metal forming of high alloy steel using laser generated aluminum bronze tools

Agglomerated Tungsten Carbide: A New Approach for Tool Surface Reinforcement

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