Local Tribological Characteristics of Steel Sheets for Microforming

Evin, Emil; Tomáš, Miroslav; Výrostek, Marek; Semjon, Vladimír

doi:10.4028/www.scientific.net/kem.586.116

Cited by 5 publications

(3 citation statements)

References 4 publications

(5 reference statements)

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“…In the preparation of PVD coatings are the most frequently used the following complex compounds: TiN -titanium nitride, TiCN -titanium carbonitride, TiAlN -titanium and aluminum nitride, CrCN -chrome carbonitride, ZrN -zircon nitride, CrN -chrome nitride and WC -wolfram carbide [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Morphology Characteristics of Coatings for Forming Applications

Draganovská

Evin

Tomáš

2015

MSF

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The contribution focuses to study of selected properties of thin coatings deposited on tool steel. Used samples were prepared by PVD method. Samples were evaluated using the scanning electron microscopy. Characteristics of surface morphology Ra, Rz Rt, RSm and RPc were established according to standard STN EN ISO 4287. The coatings TiN, TiCN, Supral and Exxtral Plus have been deposited on tool steel substrate having a thickness of 16 mm. The morphology characteristics were compared to the surface morphology of the reference material tool steel X155CrVMo12.1.

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Section: Introductionmentioning

confidence: 99%

Morphology Characteristics of Coatings for Forming Applications

Draganovská

Evin

Tomáš

2015

MSF

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“…They have superior surface and good technology workability [2,3]. Considering initiated characters we can expect these steels could to be used as the high temperature operated appliances [4][5][6][7][8][9]. The main goal of this paper was to analyse creep fracture mechanism in the increased temperatures.…”

Section: Introductionmentioning

confidence: 99%

Steel KODUR 460MC under Creep Condition

Mihaliková

Čižmárová

2014

KEM

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This paper analyses a failure of the micro alloyed steel (Re= 500MPa) at a temperature range 400 - 500 oC in the tensile test conditions and in the creep conditions. The failure character in condition tensile test was changeless and the fraction was transcrystalline ductile. The structure near a fraction showed a considerable deformation texture (reduction of area = 76%). The contraction and the fraction stress considerable was decreased by the increase of the time up to the fraction and the by the increase of temperature in the creep conditions. There were formed secondary intercrystalline cracks except the central crack in the area fraction. Intercrystalline cracks were started step by step to be connected each other. The fraction was started to obtain a mixed status alike and the intercrystalline (creep) fraction part was started to increase.

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“…Moreover, resistance to friction depends on physical and chemical factors acting on the contact surface, dynamics of load, temperature [1][2][3][4] and directionality of sheet surface topography [5]. In majority of sheet metal forming processes existence of frictional resistance is undesirable pheno-menon and case: strain non-uniformity especially in thin-walled drawpieces, increasing of forming forces, decreasing of tool life and quality of product conformance.…”

Section: Introductionmentioning

confidence: 99%

Effect of friction conditions on change of sheet surface roughness during deep drawing

Bazan

Trzepieciński

2013

ZN PRz Mechanika

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The article deals with problems related to analysis of friction existed in sheet metal forming. In order to determine the influence of surface parameter value of the sheets, surface parameters of the rollers and pressure force on friction coefficient value the strip-drawing friction tests have been performed. Furthermore, the analysis of the effect of friction conditions on the change of sheet roughness parameters has been done. The topographical analysis of tested samples was carried out by using the measurement system Alicona InfiniteFocus. As the testing materials lowcarbon deep drawing quality steel sheet has been used. In case of rolls with surface roughness parameter value of Ra = 0.63 and 1.25 µm the smoothing of peaks roughness during the friction process was observed. For the roll with surface roughness value of Ra = 2.5 µm the highest deviation of the surface after friction tests in respect of the reference surface exists below the reference surface. In all analyzed frictional conditions the decreasing of the value of the surface roughness parameters Ssk and Sku characterizing the topography of the sheets was noticed. During tests realized in dry friction conditions the value of surface roughness parameter Ssk was smaller than for lubrication conditions. In case of Sku parameter the reverse dependence was observed.

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Local Tribological Characteristics of Steel Sheets for Microforming

Cited by 5 publications

References 4 publications

Morphology Characteristics of Coatings for Forming Applications

Morphology Characteristics of Coatings for Forming Applications

Steel KODUR 460MC under Creep Condition

Effect of friction conditions on change of sheet surface roughness during deep drawing

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