Forming/MouldingProcessesDis/advantages Flashcards
Advantages of injection moulding
-low cost per unit
-very quick process
-high detail
-repeatability
Disadvantages of injection moulding
-draft angles preventing 90 degrees from the base of the product
-High set-up cost
-not good for low volume production
-needs skilled workers
-witness marks
advantages of extrusion
-low cost per part
-Flexibility of operation
-high volumes produced
disadvantages of extrusion
-High initial cost set-up
-limitation because only one type of cross section can be obtained at a time
-varies in size of product
advantages of vacuum forming
-useful for making prototypes
-low manufacturing costs
-low moulding costs
-extremely easy to switch out moulds
disadvantage of vacuum forming
-not easy to keep a consistent thickness of plastic around the whole component
-limited detail and complexity
-Lots of waste
-only one product can be made at a time
advantages of rotational forming
-higher durability products because there is no parting line
-nicer appearance from no parting line
-low cost tooling
disadvantages of rotational forming
-High cycle times
-limited material options
-high cost of raw materials
-high labour costs
advantages of thermoforming
-Cost effective due to mass production
-most plastics are suitable for this
-simple to learn, doesnt require as much skills as others
disadvantages of thermoforming
-can only use thin-wall designs
-may require other forming methods within this method
-not versatile material process
-Thickness of component walls may not be even
Advantages of blow moulding
-once set up, it is a very rapid process
-good for high and low production scales
-suitable for many plastics
-less expensive than injection moulding
Disadvantages of blow moulding
-Limited to hollow parts
-Moulds can be expensive
-difficult to produce shapes that can easily leave the mould
-hard to make triangular shapes
