Methoding
of castings is a complex science. It involves the basic selection of :
(i)
Design and construction of pattern equipment
(ii)
Processes and practices for moulding, core making and core setting
(iii)
Risering and gating system
Apart
from the above technical parameters, clue consideration
sl
poi ld be given for economic factors while methoding the castings.
The following
points should be considered :
1.
Type of moulding and core making process
2.
Position of the casting in the mould box
3.
Suitable joint line
4.
Suitable mould box size
5.
Type of mould and core making materials
6.
Material specification
7.
External and internal chills if permissible
8.
Chaplets if permissible
9.
Mould and core checking and setting gauges
10. Sequence of core setting
11. Provision of vents and flow offs.
12.
Number of pieces to be produced
13.
Type of material for pattern and core boxes
14.
Pattern and core box details
15.
Placement of identification codes
16.
Indication of surfaces for marking and machining
17.
Estimated yield percentage of the castings
While
deciding the suitable method of manufacturing the intricacies of the concerned
job should be analysed from all the angles and the final acceptable casting
concept decided, considering the resources available within the foundry.
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