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Searching entire Technology Site for Moulding
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MRAT - 1.052 - Plastics: Abrading and Trimming Equipment
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Shaping and cutting plastic materials by machine (bandsaw, drilling, metal centre lathe and moulding trimmer).
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MRAT - 1.020 - Heat Processes: Casting, Fumes and Sand
MRATsProjects
The production of a one-piece component, often of complex shape, from molten metal poured into the cavity of a sand mould (oil-bonded or green sand). The pattern is sometimes made of expanded polystyrene, which is left in place and is vaporised by the hot metal. Alternatively, a steel mould can be used where re-use is envisaged. Composite moulds, eg, thin MDF forms between steel plates, are sometimes used for one-off exercises, especially when using low-melting point metals.
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MRAT - 4.009 - 3-Dimensional Work: Plaster Of Paris
MRATsProjects
Pressing an object into a slurry of plaster of Paris and water, with a view to making a mould.Pouring a slurry of plaster of Paris and water into a mould to make acast of it. Making models or sculptures using a stiff slurry of plaster of Paris and water.Using strips of plaster of Paris-impregnated bandage soaked in water for modelling, sculpture or making moulds of body parts.
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MRAT - 1.062 - Plastics: Vacuum and Pressure-Forming Equipment
MRATsProjects
In both processes, a thermoplastic sheet is clamped around its edges and heated. In vacuum forming, the air between the mould and the work is evacuated. The mould is then elevated into the sheet. Atmospheric pressure on the material then presses it onto the mould.In pressure forming, air pressure is applied to the underside of the hot sheet forming it into part of a sphere.Some plastics must be pre-heated to dry them.
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