Influence of surface roughness on friction during metal forming processes

Mahrenholtz, O.; Bontcheva, N.; Iankov, Roumen

doi:10.1016/j.jmatprotec.2003.10.009

Cited by 37 publications

(15 citation statements)

References 8 publications

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“…Further research will be carried out in the field ofcomparison of size of abrasion which mainly depends on mechanical properties, microstructure of the surface, structure and composition of ZnFe layers and on requirements of forming. According to paper [3,4] the abrasion of steel sheets type "galvaneal" will be propably higher than of those with clean metallic zinc coating. Comparing the friction coefficients calculated from experimentally measured data (see Table 3), better conformity was reached between friction coefficients computed from strip pulling force values according to eq.…”

Section: Results and Discusionmentioning

confidence: 99%

“…Phases presented in annealed zinc coating have different properties, this means, that the utility properties (corrosion resistance, abrasion resistance, formability, weldability, and lacquering, etc.) will vary in dependence on phase composition of the coating [3,4]. According to [5] friction coefficients for zinc coated materials are higher to compare with uncoated sheets.…”

Section: Introductionmentioning

confidence: 99%

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SOME TRIBOLOGICAL ASPECTS OF Fe-Zn COATED STEEL SHEETS AT STAMPING PROCESSES

Evin¹,

Tomáš²,

Kollárová³

et al. 2014

Acta Metall Slovaca

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Contribution presents results of study of tribological characteristics of Fe-Zn coated steel sheets. Experimental research was done using coatings with different alloying -under alloyed, optimal and slightly pre alloyed. The optimally alloyed coatings and the slightly prealloyed ones were annealed in order to reach different alloying level. Alloying level was evaluated by phase composition and % Fe in coating. Tribological properties such as surface microgeometry, abrasion, friction coefficient were analysed from the view of formability. Experimental results of strip drawn test were used for verification of strip-drawn test numerical simulation. Based on numerical simulation results, contact pressure on drawing die radius was observed.Keywords: Fe-Zn coatings, steel sheets, coating morphology, friction coefficient, numerical simulation IntroductionCurrent production in the automotive, consumer goods industry and also other industries must adapt to many; often mutually conflicting technical, economic and environmental requirements. On the one hand, customer demands for products performance, primarily for safety, reliability, corrosion resistance, driving dynamics, comfort and economy are growing; on the other hand, pressure to reduce emissions, higher productivity, eco-friendly production, reduction of maintenance costs and prices of products is increasing. The main innovative trends for increasing the performance of automobiles include reducing the weight of structural parts that contribute the most to the total weight of the car (body 26 %, 23 % undercarriage, motor 21 %, 22 % equipment, etc.). The effectiveness of this approach has been demonstrated by the results of the project ULSAB. For more than 80% of structural elements of the ULSAB body the builders have used high-strength steels with yield strength from 210 to 550 MPa, ultra-high strength steels with yield strength above 550 MPa, almost half of the weight of the body consists of laser-welded tailored blanks (tailored blanks) and sandwich materials [1,2]. In order to ensure the adequate lifetime of autobodies, majority of structural elements of ULSAB body are made of zinc coated sheets. Among the coated steel sheets are given the ratio between quality and the price of its irreplaceable galvanized sheets. During annealing after galvanization the transformation of the

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Section: Results and Discusionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

SOME TRIBOLOGICAL ASPECTS OF Fe-Zn COATED STEEL SHEETS AT STAMPING PROCESSES

Evin¹,

Tomáš²,

Kollárová³

et al. 2014

Acta Metall Slovaca

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“…Other typical examples that can illustrate systems' applications in industrial environments occur in the synchronization that must exist between different running shafts of a computer numerical control (CNC) machinery [4], [17] or in the coordination of robots that exhibit the capability to execute movements of multiple axes [18][19]. Others types of applications are related with vibration measurements that are very important to evaluate the performance of industrial plants, namely the measurement of piping structures, motors and control valve vibrations, among others, which are essential to schedule corrective and predictive maintenance tasks based on regular or continuous monitoring results [20].…”

Section: Introductionmentioning

confidence: 99%

A Smart and Distributed Measurement System to Acquire and Analyze Mechanical Motion Parameters

Pereira¹,

Viegas²,

Postolache³

et al. 2013

Metrology and Measurement Systems

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This paper presents a low-cost and smart measurement system to acquire and analyze mechanical motion parameters. The measurement system integrates several measuring nodes that include one or more triaxial accelerometers, a temperature sensor, a data acquisition unit and a wireless communication unit. Particular attention was dedicated to measurement system accuracy and compensation of measurement errors caused by power supply voltage variations, by temperature variations and by accelerometers' misalignments. Mathematical relationships for error compensation were derived and software routines for measurement system configuration, data acquisition, data processing, and self-testing purposes were developed. The paper includes several simulation and experimental results obtained from an assembled prototype based on a crank-piston mechanism.

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“…The third period (1990–until now) has been mainly driven by research objectives that were not properly taken into consideration during the two earlier periods. For example, the development of new complementary geometries of the ring compression test so as to allow for characterization of friction under low and high normal pressure conditions 11 and the enhancement of friction mechanics by taking into consideration the inﬂuence of surface topography and roughness 12–14 …”

Section: Introductionmentioning

confidence: 99%

The Role of Interfaces in the Evaluation of Friction by Ring Compression Testing

2012

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The role of interfaces in friction is most frequently not taken into account when performing the evaluation of the coeffcient of friction by means of process and simulative tribology tests. Despite being diffcult and time consuming to control surface roughness as well as the formation of oxide ﬁlms through exposure to surrounding medium, it is very important to perform the experiments under conditions similar to those commonly found in real metal forming processes. As accuracy and reliability of the experimentally determined coeffcients of friction depend on the similarity to real metal forming conditions, this paper is aimed to provide a comprehensive analysis on the inﬂuence of oxide ﬁlms and surface roughness in the evaluation of friction by means of the ring compression test. The paper presents an innovative experimental approach for ring compression testing under controlled conditions of exposure to atmosphere and surface roughness. Quantitative data obtained in presence of inert and active gas shields and across typical values of surface roughness allow understanding the role of interfaces in friction and to build a conscience on its prospective source of modelling errors due to experimental drift from real metal forming. Results show an increase of the coeffcient of friction up to 30% when active gas shields are employed.

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Influence of surface roughness on friction during metal forming processes

Cited by 37 publications

References 8 publications

SOME TRIBOLOGICAL ASPECTS OF Fe-Zn COATED STEEL SHEETS AT STAMPING PROCESSES

SOME TRIBOLOGICAL ASPECTS OF Fe-Zn COATED STEEL SHEETS AT STAMPING PROCESSES

A Smart and Distributed Measurement System to Acquire and Analyze Mechanical Motion Parameters

The Role of Interfaces in the Evaluation of Friction by Ring Compression Testing

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