Tutorial: Engineering technology Topic: Casting – basic definitions Prepared by: Ing. Elena Nová Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/ je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.
Casting – basic definitions
Netrvalé formyTrvalé formy Non permanent forms Permanent forms
Non-permanent forms Are made from silicon sand and binder. After solidification of casting are disposed. For manufacturing of non-permanent cast a mould is needed.
Mould - is made according to drawing of desired casting Mould is bigger than final cast, due to its shrinkage at cooling down. Longitudinal shrinkage of casts. Grey iron 1% Steel 2 % Alloys of Mg 1,2%
Moulds can be: Permanent Investment / Lost wax Permanent can be used repeatedly. Lost (wax) is melted and replaced by metal. Permanent mold casting:
Creation of hollows
Permanent Mold Casting
Casting method - Investment / Lost wax model:
Non-permanent mouldsAlloys Permanent moulds Loss wax Moulds Core Core box Technical drawing Casting Grey iron Silicon sand Steel
What is produced from silicon sand and binder? For manufacturing of non-permanent form we need mould. How is it made? Why is mould bigger than final product? What is longitudinal cast shrinkage. What mould types do you know? Explain expression Investment / Lost wax
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