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Home  Filtration technology  Gating system designing  Filter placing in gating system

Filter placing in gating system

Horizontal filter position

Under the sprue   

(maximum casting height of 300 mm)

In the runner

Vertical filter position

Under the sprue    

In the runner

Oblique/Inclined filter position

Under the sprue   

(maximum casting height of 300 mm)

In the distribution runner

Moulds with vertical parting line (Disamatic, chill moulds)

 

Placing in the sprue

 

Direct Casting on the Filter in the Riser

Direct casting through the riser is a relatively new method which can be utilized with success in all materials, where the riser is necessary (aluminium, nodular cast iron, steel), The main contribution consists in elimination of the gating system, increased yield of the liquid metal and effective elimination of inclusions out of the cast metal. The thermal node, created by the common gating system, is also eliminated in many times, thanks to which utilization/yield of the liquid metal is increased.

Advantages of the direct casting can be summarized as follows:

  • simplification of the gating system
  • increased utilization of the liquid metal
  • effective elimination of inclusions
  • saving of place in the mould

The technology of direct casting can be applied for certain casting types only; in many cases we are speaking about the castings of a simpler shape with lower height (up to ca 500 mm). Application of this technology is not so simple for the castings of a complex shape, thin-wall castings, higher castings or for the castings where the core is placed under the gate (because in this case higher requirements are raised for the core). Designed filter size depends on its capacity for a certain alloy.

Filter in exothermic riser for steel

placed in the groove

Filter in exothermic riser for steel

placed in intermediate insert

Filter in exothermic riser for steel

bevelled filter

Filter in exothermic riser

for  cast iron

Filter in exothermic riser

for cast iron, reversed bevel

Filter in insulation riser

for aluminium alloys

The method of filter layout in the riser depends on the type of riser and on possible filter shape. The most common riser for steel is of narrowed shape. The filter can be placed into the moulded groove, which the majority of manufacturers is able to made in the riser; into the intermediate insert made of the core mix (smaller filter dimensions are its advantage) or the bevelled filter can be placed. These types of risers are used for manual moulding and for moulding on jolt-moulding machines. On the moulding lines this solution can hardly be applied. Direct casting on the cast iron: cylindrical riser shape is used; the filter is seated in the bottom riser part or in its top part. The riser can be more easily placed from the parting line and filter does not prevent additional seating. Insulation risers can be used for direct casting in case of aluminium castings.


A more detailed information will be released if requested so (e.g. calculation of pressure ratios of the gating system with filter, filtering out of the mould parting line, pouring filter parameters). Do not hesitate to contact the sales department of our company.

 
created by Omega Design