PART2 1. A common ball point pen contains many parts including a spring, small p
ID: 1717225 • Letter: P
Question
PART2
1. A common ball point pen contains many parts including a spring, small plastic tube (ink cartridge), tungsten carbide ball and brass tip. Have a go at guessing how each would be made in high volumes. You may use diagrams to help you.
2. Reducing the grain size in metals is often desirable. Describe how grain size may be reduced in both forgings and castings and the benefits of doing this.
3. Describe 3 possible problems relating to the injection moulding process and how they are minimised/overcome with appropriate design for manufacture knowledge. You may use sketches to help you.
4. Explain how resistance welding works. Describe a design for manufacture issue relating to spot welding. You may use diagrams to aid you.
Explanation / Answer
4 In resistance welding , weld isproduced by means of electrical resistance across two components to be joined .The heat is generated by the equation
H= I* I * R*T
H Heat generated in joules
I current in amperes
R Resistance in ohms
T time of current flow in seconds
The welds produced by resistance welding are normally without the addition of any filler material, electrodes and shielding gases
3
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