Influence of runner geometry on the gas entrapment in volume of pressure die cast

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F75081431%3A_____%2F19%3A00001591" target="_blank" >RIV/75081431:_____/19:00001591 - isvavai.cz</a>

Result on the web

<a href="http://journals.pan.pl/dlibra/publication/129626/edition/113141/content" target="_blank" >http://journals.pan.pl/dlibra/publication/129626/edition/113141/content</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.24425/afe.2019.129626" target="_blank" >10.24425/afe.2019.129626</a>

Result language

angličtina

Original language name

Influence of runner geometry on the gas entrapment in volume of pressure die cast

Original language description

The high pressure die casting technology allows the production of complex casts with good mechanical properties, with high production repeatability within narrow tolerance limits. However, the casts are somewhat porous, which may reduce their mechanical properties. There are several recommendations for reducing the porosity of casts, which are aimed at setting the technological parameters of the casting cycle. One of the primary and important ways to reduce the porosity and air entrapment in the melt is a suitable gating system design. Submitted contribution is devoted to assessing the influence of the runner branching geometry on the air entrapment within the cast volume during the filling phase of the casting cycle. Four variants of the gating system for a particular cast are compared with different design of main runner branching. The initial design is based on a real gating system where the secondary runner is connected to the main runner at an angle of 90 °. The modified designs are provided with a continuous transition of the main runner into the secondary ones, with the change in the branching runner radius r1 = 15 mm, r2 = 25 mm and r3 = 35 mm. The air entrapment in the melt is assessed within the cast volume behind the cores, which have been evaluated as a critical points with respect to further mechanical treatment. When designing the structural modification of geometry it was assumed that by branch changing using the radius value r3 = 35 mm, the melt flows fluently, and thus the value of the entrapped air in the volume of the cast will be the lowest. This assumption was disproved. The lowest values of entrapped air in the melt were found in the casts with runner transition designed with radius r1 = 15 mm. The conclusion of the contribution explains the causes of this phenomenon and from a designing point of view it presents proposal for measures to reduce the entrapment of the air in casts

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

20301 - Mechanical engineering

Project

—

Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Archives of Foundry Engineering

ISSN

1897-3310

e-ISSN

—

Volume of the periodical

19

Issue of the periodical within the volume

3

Country of publishing house

PL - POLAND

Number of pages

6

Pages from-to

33-38

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85072811194