Vacuum Forming (Leaving Cert Engineering): Flashcards
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Practise the cards
13 cards from this deck
What is vacuum forming?
What is vacuum forming?
Manufacturing process shaping thermoplastic sheets into 3D forms
Material used in vacuum forming
Material used in vacuum forming
Thermoplastic
What forces plastic against the mould?
What forces plastic against the mould?
Atmospheric pressure
Thermoplastic property when heated
Thermoplastic property when heated
Becomes soft and pliable
Purpose of pre-heating thermoplastic
Purpose of pre-heating thermoplastic
Makes it flexible to conform to mould shape
First step in vacuum forming
First step in vacuum forming
Heat flat thermoplastic sheet until pliable
How sheet is secured over mould
How sheet is secured over mould
Clamp system
How is vacuum created?
How is vacuum created?
Vacuum pump removes air through holes in mould
Role of atmospheric pressure
Role of atmospheric pressure
Pushes plastic firmly against mould surface
Mould release agent used
Mould release agent used
Talc
Common misconception about vacuum forming
Common misconception about vacuum forming
Vacuum sucks plastic (actually pressure pushes)
Vacuum forming applications
Vacuum forming applications
Bathtubs, signs, model parts, automotive interiors
Why temperature control is critical
Why temperature control is critical
Too cold won't form; too hot tears or burns