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1

Application of the torsion test in calculating the extrusion force

Pernis R., Bidulska J., Kvačarkaj T., Pokorny I.

Archives of Metallurgy and Materials

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2011

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Vol. 56, iss. 1

81-85

EN

The paper deals with the calculation of the extrusion force using the results of the torsion test of aluminium alloy EN AW-2014. The mathematical model for the calculation of the extrusion force requires the knowledge of the functional relationship between the yield stress and the temperature, the deformation and the deformation rate. Based on the proposed mathematical model for the calculation of the yield stress, the functional relationship was derived to determine the extrusion force in the hot extrusion of semi-products of aluminium alloy EN AW-2014.

2

Influence of gating system design on tensile properties of AlSi7Mg0.3 alloy

Kasala J., Pernis R., Čaplovič L'.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 1 spec.

117--120

EN

Aluminium-silicon castings are typically produced by gravity casting. Bottom gated systems are usually required if surface turbulence is to be eliminated. Latest research has demonstrated, that for every liquid metal there is critical velocity above which the surface will fold over and entrain itself in the bulk of the metal. Therefore the strength properties the aluminium castings are largely determined by microstructural defects, particularly pores and oxide films which are created by surface turbulence. The purpose of this paper is to investigate tensile properties and microstructure of aluminium alloy in a casted state two different designs of gating system. The first is the usual bottom gating system and the second is novel design of gating system named a vortex-gate introduced by Campbell [1]. The results of the mechanical tests revealed that there is a small improvement in ultimate tensile strength for vortex-gate design of pouring system. The oxide film defects were observed in microstructure of a sample taken from poured casting by using the bottom gated system.

3

Ciągnienie rur na tprzpieniu swobodnym.

Pernis R.

Rudy i Metale Nieżelazne

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2001

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R. 46, nr 7

305-311

PL

Przedstawiono teoretyczne podstawy procesu technologicznego ciągnienia rur na trzpieniu swobodnym oraz jego zalety techniczno-ekonomiczne. Podstawowe parametry technologii oraz analiza wpływu geometrii narzędzi na intensywność procesu ciągnienia rur na trzpieniu swobodnym. Graniczne warunki stosowania omówionej technologii oraz analiza kątów stożka ciągadła i trzpienia. Omówienie przebiegu prób i badań, zestawienie ich wyników oraz wnioski.

EN

Theoretical basis for the technological process of floating-plug drawing of tubes and its technical and economical advantages. The principal parameters of technology and analysis of the influence of tool geometry on the intensity of the process of floating-plug drawing of tubes. The limitary conditions for application of the discussed technology and analysis of the angles of the drawing-die and drawing-plug. Discussion of the course of investigations and tests, list of their results; conclusions.