Dry Cylindrical Cup Drawing Using Electroconductive Ceramic Tools

Tamaoki, Kenji; Kataoka, Seiji; Minamoto, Kouki

doi:10.9773/sosei.48.930

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…As regards the zinc-coated steel, the SiC die had very good performance similar to that of lubricated deep drawing in uncoated die. In a later work Tamaoki et al, [194], points out the difficulties of machining ceramic dies of the mentioned type and propose as an alternative to apply an electro conductive die material, NPZ-28. With a die of this ceramic, dry deep drawing of mild steel sheet gave the same LDR as lubricated deep drawing with a conventional tool steel die and low tendency to galling.…”

Section: Ceramic Toolsmentioning

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: Ceramic Toolsmentioning

confidence: 99%

Environmentally benign tribo-systems for metal forming

et al. 2010

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“…Their research was extended by Osakada et al who investigated the impact of surface roughness on the coefficient of friction [5]. Kataoka et al [6,7] and Tamaoki et al [8,9] investigated dry deep drawing with ceramic tools and achieved comparable results with the lubricated forming of low-alloyed steels, stainless steels and aluminum. The state of the art mainly covers sheet metal forming processes.…”

Section: Introduction and State Of The Artmentioning

confidence: 97%

Evaluation of the shear stresses on surface structured workpieces in dry forming using a novel pin-on-cylinder tribometer with axial feed

et al. 2016

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In production engineering cold forging processes are of great importance due to the high material utilization and the associated energy and resource efficiency. In order to successfully perform cold forging processes, liquid and solid lubricants are used, which are often questionable due to ecological, economic and legislative reasons. For these reasons, dry forming exhibits an increased research potential. The absence of lubricants in dry forming significantly contributes to the waste reduction in manufacturing processes and to the goal of a lubricant-free factory. However, this goes along with the requirement that the dry tribological system has to incur the functions of absent lubricants. In this work, it is proposed to reduce friction by surface structures on workpieces. Positive effects of surface structures were already observed in dry sheet metal forming

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“…Tamaoki et al developed electroconductive ceramic tools for deep drawing [10] and was able to reach drawn quantities as high as with MATEC Web of Conferences 190, 14009 (2018) https://doi.org/10.1051/matecconf/201819014009 ICNFT 2018 lubricants [11]. Due to higher process loads and surface extension a transfer of these findings to cold metal forming is not directly possible [12]. Furthermore, the investigation of the influence of surface textures on cold forging processes are rather rudimental.…”

Section: Introductionmentioning

confidence: 99%

Influence of surface integrity on the plastic flow in analogous testing of 42CrMo4

et al. 2018

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Surface modification of workpieces for cold forming processes is common in industrial practice. Specific surface topographies manufactured by means of shot peening form lubricant pockets, which provide a continuous lubricating film throughout the process. Furthermore, hydrostatic as well as hydrodynamic lubrication effects emerge, which further reduce the friction during the process and protect the tool from wear effects. These effects are well researched and applied in order to enable cold forming processes. In dry forming processes, no lubricants are used, and the positive lubrication effects do not appear. Surface modifications by shot peening or knurling change surface integrity in terms of hardness, residual stresses and geometry. The effects of the changed surface integrity on the forming process are not researched. In tribometer tests, a hard and rough surface texture lead to a lower frictional shear stress, whereas a rather smooth and hard surface texture leads to a lower punch force in an extrusion process. The mechanisms between surface textures and the smoothing and forming process are unknown. Furthermore, findings of the tribometer tests cannot be fully transferred to the extrusion process. As in tribometer tests a pin is used as tool and in extrusion a whole die, a discrepancy between the most suitable surface texture for a friction reduction results out of different flow conditions. Still, the tribometer tests give a first reference on a surface pretreament. The paper deals with an investigation of surface textures in order to distinguish characteristics of surface textures respectively a friction reduction. By means of indentation tests of the quenched and tempered steel 42CrMo4 the plastic flow in dependency of different surface integrities are researched. The results show which characteristics help to lower the punch force the most, so for further investigations an optimized surface modification is set up in order to enable a dry metal forming process.

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Dry Cylindrical Cup Drawing Using Electroconductive Ceramic Tools

Cited by 6 publications

References 3 publications

Environmentally benign tribo-systems for metal forming

Environmentally benign tribo-systems for metal forming

Evaluation of the shear stresses on surface structured workpieces in dry forming using a novel pin-on-cylinder tribometer with axial feed

Influence of surface integrity on the plastic flow in analogous testing of 42CrMo4

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