Friction effect of surface treated tools used for warm forming of Mg alloy sheets

Lee, Youngseon; Kim, Sang Woo; Sung-young, Park，; Yoo, J.H.; Moon, Young-Hoon

doi:10.1007/s12541-014-0637-x

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…At a cutting depth a p = 0.5 mm, the active force changes to a level of 353 ± 33 N. In this constellation, high values for the cutting speed v c and the lead angle β f lead to a reduction of up to 49.5 N (14%) and 20 N (5.7%), respectively. The reduction in cutting forces with increasing cutting speed v c is consistent with the literature [18]. This effect is attributed to an energy-induced higher temperature and thus a softening of the workpiece material, which leads to a decrease in strength and thus in cutting force.…”

Section: Cutting Forcessupporting

confidence: 90%

“…With regard to the forming process, the optimized topographic condition by applying functional surface structures in local areas of the forming tool can enable friction-dependent control of the material flow, resulting in higher mold filling of the tool cavities [11,16]. With regard to hot forming, different coating systems have been investigated in a hot strip drawing test and a pin-on-disc test to evaluate the friction and wear at different temperatures unveiling an increased friction with rising temperature [17,18]. However, the potential of HFM surface structures in hot work tool steels for the efficient fabrication of tribologically modified tools to improve material flow control in hot forming processes is poorly investigated.…”

Section: Introductionmentioning

confidence: 99%

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Potential of high-feed milling structured dies for material flow control in hot forming

Platt

Baumann

Biermann

2022

Prod. Eng. Res. Devel.

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Hot forming processes of complex parts with small cavities demand high-performance tools made of hardened steels. Their surface can be tribologically modified in order to control the material flow for improving the mold filling of functional elements. Surface structuring here offers great potential for adjusting the frictional properties and thus controlling the material flow in forming processes. In this study, high-feed milling (HFM) of surface structures in hot work tool steel (HWS) components is investigated. The process performance was determined by cutting force measurements and tool life tests. The achievable surface topography was measured and evaluated in terms of structure quality and roughness parameters, and friction properties were derived based on the results. In a hot ring compression test, the influence of certain structure variants on the material flow was analyzed. The results conclude that HFM is a suitable process for structuring HWS components with constant structure quality and low tool wear. In addition, a variety of structures showed significant influence on the hot ring compression test. This indicates a relevant potential of HFM for the modification of hardened tool surfaces to improve the performance of hot forming processes and increase the manufactural quality and productivity.

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Section: Cutting Forcessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Potential of high-feed milling structured dies for material flow control in hot forming

Platt

Baumann

Biermann

2022

Prod. Eng. Res. Devel.

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“…The Coulomb friction coefficient at the interfaces between the tooling components and the sheet material was assumed as 0.1 at 25-150 • C, 0.2 at 200 and 250 • C, and 0.4 at 300 • C. The selection of relatively high values of friction coefficients at higher temperatures is based on friction study on magnesium alloys at different lubrication conditions at elevated temperatures [32][33][34][35]. Local increase of friction coefficient at high temperatures is due to the possible failure of lubricant and friction coefficient selection strategy discussed in [36].…”

Section: Fem Modeling Of Round Cup Drawmentioning

confidence: 99%

Developing a Zener–Hollomon Based Forming Limit Surface for Warm Sheet Forming of Magnesium Alloy

Sheng¹,

Mallick

2018

JMMP

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Abstract:The concept of Zener-Hollomon (Z) based Forming Limit Surface (Z-FLS)-which has minor strain, major strain, and ln(Z) as its three axes-was initially proposed in a previous study. In the Z-FLS diagram, strain rate and temperature effects on the major limit strain are reflected by ln(Z). In the current study, the concept of Z-FLS is revisited to provide a practical approach to construct Z-FLS. A Z-FLS then is constructed for magnesium alloy AZ31B sheet material using available experimental forming limit curves. The constructed Z-FLS is used to identify fracture in a non-isothermal warm cup forming process, which was modeled as a coupled thermo-mechanical process. Based on the Z-FLS, the determined limiting draw ratio (LDR) matches well with the published experimental results.

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Functionalization of Tool Topographies for Material Flow Control and Tool Life Optimization in Hot Sheet-Bulk Metal Forming – A Concept Study

Platt

Biermann

2020

Lecture Notes in Production Engineering

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Friction effect of surface treated tools used for warm forming of Mg alloy sheets

Cited by 6 publications

References 8 publications

Potential of high-feed milling structured dies for material flow control in hot forming

Potential of high-feed milling structured dies for material flow control in hot forming

Developing a Zener–Hollomon Based Forming Limit Surface for Warm Sheet Forming of Magnesium Alloy

Functionalization of Tool Topographies for Material Flow Control and Tool Life Optimization in Hot Sheet-Bulk Metal Forming – A Concept Study

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