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S P E C I A L<br />

A L U M I N I U M I M A U t o M o b I L<br />

a prime requisite for ad<strong>de</strong>d strength<br />

which is further enhanced through<br />

heat treatment. Moreover, the slight<br />

porosity in the cylin<strong>de</strong>r bore zone<br />

opens up the option of coating the<br />

working surface.<br />

Furthermore, Atag has <strong>de</strong>veloped<br />

an innovative inhouse gravity tilt<br />

casting technique inten<strong>de</strong>d for the<br />

<strong>special</strong> operating environment of<br />

high-duty engines, as aluminium in<br />

the form of aluminium castings from<br />

high-gra<strong>de</strong> AlSiMg primary alloys<br />

poses vast challenges regarding thermal<br />

strength. Durability benchmarks<br />

are only addressable with the aid of<br />

an extremely fine microstructure<br />

in the combustion zone of the fire<br />

<strong>de</strong>ck.<br />

One solution to this problem is the<br />

new gravity tilt casting process as it<br />

guarantees a largely low-turbulence<br />

mould-filling at the camshaft end and<br />

a rising layer-by-layer filling of the<br />

mould promoted by the tilting action.<br />

A <strong>de</strong>cisive factor is the highly intense<br />

chilling of the combustion zone at the<br />

fire <strong>de</strong>ck si<strong>de</strong>. The achievable low<br />

<strong>de</strong>ndrite arm spacing reaches benchmark<br />

level.<br />

Another plank in the Atag business<br />

strategy of reducing <strong>de</strong>pen<strong>de</strong>ncy on<br />

engine products is the casting of large<br />

and technologically challenging chassis/suspension<br />

parts in aluminium, a<br />

move that will bolster the company’s<br />

automotive business.<br />

Sectional view of cylin<strong>de</strong>r head cast by gravity tilt casting technique<br />

Brennraumbereich <strong>de</strong>s Feuer<strong>de</strong>cks<br />

erfüllt wer<strong>de</strong>n.<br />

Das neue Schwerkraft-Kippgießverfahren<br />

trägt zur Problemlösung<br />

bei, in<strong>de</strong>m es für eine weitgehend<br />

turbulenzarme Formfüllung auf <strong>de</strong>r<br />

Nockenwellenseite und eine vom<br />

Kippvorgang begünstigte, schichtend<br />

steigen<strong>de</strong> Füllung <strong>de</strong>r Kokille sorgt.<br />

Von entschei<strong>de</strong>n<strong>de</strong>r Be<strong>de</strong>utung ist<br />

dabei eine höchst intensive Abschreckung<br />

<strong>de</strong>s Brennraumbereichs auf <strong>de</strong>r<br />

Feuer<strong>de</strong>ckseite. Hierbei erreicht <strong>de</strong>r<br />

A U t o M o t I v E<br />

Mit ihrem modularen Druckgusskonzept steigert Atag die Festigkeit downgesizter<br />

Zylin<strong>de</strong>rkurbelgehäuse<br />

Atag has <strong>de</strong>veloped the modular die-casting concept for enhancing the strength of downsized<br />

engine blocks<br />

erzielbare, geringe Dendritenarmabstand<br />

Atag zufolge „Benchmarkniveau“.<br />

Zukünftig soll ein gänzlich neues<br />

Produktfeld das Atag-Geschäft unabhängiger<br />

vom Antriebskonzept machen.<br />

Dazu gehört beispielsweise das<br />

Gießen großer und komplexer, mithin<br />

gießtechnisch herausfor<strong>de</strong>rn<strong>de</strong>r<br />

Fahrwerksteile aus <strong>Alu</strong>minium. Mit<br />

dieser Neuausrichtung wird das Unternehmen<br />

sein Automotive-Geschäft<br />

weiter stärken.<br />

■ ■<br />

25 ALUMINIUM · 9/2009<br />

ALUMINIUM · 9/2009 25

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