Dr.-Ing. Norbert Erhard
Die Casting is a technically mature production process to manufacture complex components in large
In the duality for plastic injection molding, it has ever been the ambition in die casting to reduce the
casting runners of the mould further or even eliminate them.
The specific requirements in non-ferrous metal die casting do not allow transferring the hot runner
technologies of plastic injection moulding easily. Only with the development of the Frech Gating
System (FGS-System) Frech has succeeded in producing parts with virtually no sprue in hot chamber
In this connection the tempered melt is led to the cavity in the die and the casting process of the cell
is modified so that the melt front in the die can always be hold at the outlet point of the heated runner
system. Thus the FGS system is not only a hot runner system, but also a special hot chamber die
As an obvious advantage of the FGS system the considerably reduced shot can be recognized as a
result of eliminated parts of runners. The lower material capacity and the reduction of recycling portion
per shot are the correlated advantages.
In addition, there are further benefits, that can be demonstrated in the part quality, the process and
The lecture presents the FGS technology and proves the possibilities, potentials and advantages of
the hot chamber die casting on practical examples.