Translation of "Mould filling" in German

Thixoforming also allows a better mould filling with fewer air inclusions.

This enables a very high level of constancy to be achieved during mould filling.

During mould filling, generally mould contours and undercuts should be well filled and compacted.

It also allows constant mass flow during mould filling.

The satisfactory evacuation of air from the mould during the filling process has yet to be achieved.

The container has a bottom-side slide closure, which closes the mould after filling.

The above-described pressure control system may also be used for a continuously rising mould filling level.

Problems could be visualised via the mould filling simulation with the original casting technology.

This sensor has been developed for experimental purposes to provide better understanding of the mould filling process.

During the casting process, high flow speeds occur in the die-casting mould until mould filling is complete.

Thanks to the four mould sides that can be used during production, the mould filling, cooling phase and part demoulding can be carried out simultaneously.

Such problems are, for example, lamination and capping, poor separation of the tablets from the mould and uneven filling of the moulds.

In addition, the dimensional tolerances are often insufficient and there is often poor mental distribution, noticeable above all through insufficient mould filling in shaped parts with small metal crossectional dimensions.

On very rapid mould filling during thixoforming, turbulent flow conditions can occur which can lead to gas inclusions (air, separating agent or lubricant) in the mould, whereby any desirable subsequent heat treatment, for example solution heat treatment of the moulding, is often rendered impossible.

Also, the round channel cross section of the sprue allows the formation of a laminar flow for the entire speed range used for mould filling.

Within the limits of this known process, this shortcoming can be countered only by raising the threshold, which however poses a danger of the complete mould filling being detected too late, so that switchover is delayed.

The object of the invention is to further reduce the lag of the indicated switchover point behind the instant of volumetric mould filling, in order to enhance the quality of the mouldings additionally.

A very simple though relative time-consuming control of the mould filling can be achieved with the new process by lowering the hot-runner temperatures of the first cavities filled, i.e. leading in their pressure patters, and/or raising those of the cavity last filled, i.e. lagging.

For sealing the mould after filling, sealing slides integrated into the mould and located at the sprue are known (WO 93/11892, WO 95/32826), which can be moved from an open position during casting into a closed position shutting off the sprue.

Following mould filling, the sealing plug constructed as a sand mould body is displaced by means of the external drive engaging in the mould inside the guide into the closed position, in which the transition between the sprue and the casting channel is displaced away from the sealing plug.

Thus, there is also a demand for shorter casting times per cycle or for the same partial weights the requirement for a higher melt throughput during mould filling.