Casting different metals - same pattern
Casting different metals - same pattern
(OP)
I am anticipating a situation that may arise.
I am designing a component that is to be sand cast in, say, Aluminium alloy but there may, in the future, be a requirement for the same component in Cast Iron(for the sake of argument lets ignore the actual grades of material).
If we ignore the relative strengths, weights, etc. of the materials viz-a-viz the actual end component what would be the problems (from a purely casting point of view)in using the same pattern? I am thinking of shrinkage rates, feeder and riser arrangements.
I am designing a component that is to be sand cast in, say, Aluminium alloy but there may, in the future, be a requirement for the same component in Cast Iron(for the sake of argument lets ignore the actual grades of material).
If we ignore the relative strengths, weights, etc. of the materials viz-a-viz the actual end component what would be the problems (from a purely casting point of view)in using the same pattern? I am thinking of shrinkage rates, feeder and riser arrangements.





RE: Casting different metals - same pattern
Check the links inside.
RE: Casting different metals - same pattern
RE: Casting different metals - same pattern
And yes, the parts all came out slightly different sizes. It was easier to change the required dimensions or machine more as opposed to making unique patterns.
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RE: Casting different metals - same pattern
> Solidification shrinkage to be added. This varies with different metals.
> Machining allowances to be provided.
> Thin sections that can be cast and thin and thick section joints.( hot tear related problems)
> The length to which a thin section casting can poured.
> Any metal padding to assist directional solidification or mold filling capability.
> In case of castirons the smallest section that can be cast without chilling effect.
> Molding draft to be provided.
> Cored holes that can be made.
> Location of risers and their sizes . Will vary with different metals.
> Provision for placing breaker cores .
> Design of gates and down sprues. Especially in aluminium bronze and light metal casting aspiration poses a serious problem.
In view of some of these issues,it is simpler to provide a different sets of patterns for different alloys and have a peaceful weekend else it will be stressful guaranteed!!
RE: Casting different metals - same pattern
Your the voice of experience on this matter.