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EXAMINATION QUESTIONS - 4

V. Ryan 2008

 

1. Materials such as polystyrene, nylon, polypropylene and polythene can be used in a process called injection moulding. These are thermoplastics - this means when they are heated and then pressured in a mould they can be formed into different shapes.

The top of the folding picnic table seen opposite has been made in one piece using this process.

With the aid of sketches and notes explain the manufacture of the top. Marks will be awarded for the quality of notes and sketches.

 
   
STAGE ONE: USE OF CAD (COMPUTER AIDED DESIGN)
 

 

 

 

 

 

 

 

STAGE TWO: INJECTION MOULDING

 

 

 

 

 

 

 

 

 

STAGE THREE: QUALITY FINISHING

 
 

 

 

 

 

 

 

 

 

 

 

The picnic furniture seen below has been manufactured using mild steel flats and rectangular section steel tube. The parts have been primed and painted.

2. Why is it necessary to paint the steel?
 
 
 
 
 
 
   
3. What heat process could be used to permanently join the square section tube to the sheet steel identified as A?
 
HEAT PROCESS:
 
4. Handling hot metal can be very dangerous and result in serious injury. Complete the table below.
 

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