An investigation of the force and torque at profile sheet metal rolling-input data for the production system reengineering

Jurković, Milan; Jurković, Zoran; Obad, Milenko; Buljan, Stipo; Mustafic, Edin

doi:10.17559/tv-20150310092726

Cited by 5 publications

(4 citation statements)

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“…The first evidence of the synsedimentary origin of these siderite deposits was reported by Jurković. [26] Strmić-Palinkaš et al [27] recognised three textures of Ljubija siderite deposits: (a) marine dark siderite and ankerite, (b) siderite with zebra texture, and (c) siderite veins. A marine origin of the host carbonates and a hydrothermal metasomatic origin of iron mineralisation were indicated.…”

Section: Discussionmentioning

confidence: 99%

57Fe Mössbauer, XRD, FT-IR, FE SEM Analyses of Natural Goethite, Hematite and Siderite

et al. 2017

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Natural goethite, hematite and siderite were analysed with 57 Fe Mössbauer, XRD and FT-IR. FE SEM images of samples were also taken. The Mössbauer spectra of limonite (α-FeOOH · nH2O) from Budapest (Hungary), Ljubija (Bosnia and Herzegovina) and Korçё (Albania) showed the same type of spectrum, indicating low crystallinity and broad particle size distribution. All goethite particles from these three locations were one-dimensional (1D), but with different nano/microstructures. A very early precursor of limonite from Budapest and Ljubija locations was assigned to FeS2 (pyrite and/or marcasite) which oxidised upon ventilation (oxygenation) under hydrogeothermal conditions, thus producing FeSO4 and Fe2(SO4)3. In the next step limonite deposits were formed. The similarity between this limonite formation under hydrogeothermal conditions and the chemical precipitation of goethite from FeSO4 or Fe2(SO4)3 solutions at laboratory level was briefly discussed. The deposition of lateritic goethite at the Korçë location is presumed to be due to the chemical weathering (tropical conditions) of ultramafic rocks. Under the same conditions and a proper pH the transformation of goethite to hematite is possible. Alternatively, the oxidation of Fe 2+ in magnetite and its transformation to hematite via maghemite (γ-Fe2O3) as an intermediate could have taken place. The Mössbauer spectrum of siderite from the Ljubija location showed a quadrupole doublet with asymmetric spectral lines. This asymmetry could be assigned to the Goldanskii-Karyagin effect, however, the contribution of the crystallite texture to this asymmetry cannot be excluded. Hematite and a small fraction of siderite at the Vareš location (Bosnia-Herzegovina) are of metasomatic origin deposited in limestone that now form a series of greatly metamorphosed sedimentary rocks. Hematite particles were deposited in the form of laminates (2D).

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Section: Discussionmentioning

confidence: 99%

57Fe Mössbauer, XRD, FT-IR, FE SEM Analyses of Natural Goethite, Hematite and Siderite

et al. 2017

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“…We know several methods for the calculation of the power parameters of shapeforming machines manufacturing wheel rims from technical literature. Methods of different authors [4,5] fundamentally differ in the choice of the initial conditions and adopted assumptions. The latter includes the neglect of the value of the elastic deformation or taking into account the alteration of the workpiece thickness in the deformation zone, etc.…”

Section: Analysis Of Recent Studies and Publicationsmentioning

confidence: 99%

The Development of the Method for the Calculation of the Shaping Force in the Production of Vehicle Wheel Rims

Puzyr¹,

Kukhar²,

Maslov³

et al. 2018

IJET

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The objective of the paper is the development of the method for the calculation of the required force of shaping of a horizontal shape-forming machine used in the preproduction workflow. The design of a machine for horizontal shape-forming of wheel steel rims enables quick readjusting and transfer to another rim shape, which is significant under the conditions of frequent alteration of the product nomenclature. We developed the calculation method based on the assumptions of the deformations continuity, the constancy of the volume at plastic deformation and axisymmetric stressed state as well as the local application of the load. The research resulted in obtaining the analytical dependences for the calculation of the force of shaping of a wheel rim, taking into account the degree of deformation, the mechanical characteristics of the metal, hardening as well as the design and technological factors of the process. The topicality of the development consists in the necessity for the high-quality and the least expensive choice of the equipment of the required rated power when designing a new workflow. The experimental data, carried out both under the production and laboratory conditions, confirmed the adequacy of the theoretical formulas. It is determined by the assumptions and solutions obtained based on the mathematical apparatus of the technical theory of the shells of revolution. The clearness of the method will make it possible to algorithmize the calculation process quite easily and to use it as a subprogram in an applied complex of technical preproduction. It will also allow determining the shaping process most significant factors influencing the value of the force without the direct use of the calculation. We recommend to use it at enterprises producing vehicle steel wheels by the method of radial-rotation shaping.

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“…In the sheet metal profiling processes, being the most similar to the radial-rotational profiling, deformation tensor components depend on the geometrical dimensions of the resulting stream, which directly correlates with the geometry of a molding tool. This circumstance makes it possible to calculate the longitudinal and transverse deformations based directly on the depths of tool penetration at each intermediate operation, up to the finished product [8,9]. Thus, paper [10] defined action zones of the largest radial deformations using the method of finite-numerical modeling for a limited range of profile standard dimensions.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Development of a method to determine deformations in the manufacture of a vehicle wheel rim

Puzyr

Savelov

Shchetynin

et al. 2018

EEJET

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An investigation of the force and torque at profile sheet metal rolling-input data for the production system reengineering

Abstract: Ispitivanje sile i momenta profilnog oblikovanja lima pomoću valjaka-ulazni podaci za reinženjering proizvodnog sustava

Cited by 5 publications

References 1 publication

57Fe Mössbauer, XRD, FT-IR, FE SEM Analyses of Natural Goethite, Hematite and Siderite

57Fe Mössbauer, XRD, FT-IR, FE SEM Analyses of Natural Goethite, Hematite and Siderite

The Development of the Method for the Calculation of the Shaping Force in the Production of Vehicle Wheel Rims

Development of a method to determine deformations in the manufacture of a vehicle wheel rim

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