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Flashcards in Metal Manufacturing Processes Deck (67)
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1

What is planishing?

Giving a final finish to metal by hammering or rolling to produce a smooth surface.

2

What is normalising?

A heat treatment applied to steels to make the material stronger and tougher.

3

Give four example of heat treatments.

-Annealing
-Hardening
-Tempering
-Normalising

4

What is annealing?

A process to reverse the internal stress caused by work hardening.

5

Describe the process of annealing.

-The material is heated to a temperature at which the crystals grow.
-The material is "soaked" at this temperature.
-The material is then cooled very slowly.

6

What is hardening?

A process that involves heating metal to a high temperature followed by rapid cooling.

7

What is tempering?

A process carried out after hardening to remove brittleness.

8

What happens to hardness and toughness as the tempering temperature increases?

-Hardness is reduced
-Toughness is increased

9

What colour will steel go at a low tempering temperature?

Pale straw

10

What colour will steel go at a high tempering temperature?

Blue

11

Give a use of steel that has been tempered at a low temperature.

Drills

12

Give a use of steel that has been tempered at a high temperature.

Springs

13

What is quenching?

The rapid cooling of a metal following heat treatment.

14

Give four examples of quenching media.

-Brine
-Water
-Oil
-Air

15

What is the softest quenching medium?

Air

16

What is the harshest quenching medium?

Brine

17

What is age hardening?

A process in which aluminium and copper alloys are left for a period of time in which the material becomes stronger and harder.

18

What is case hardening?

A process by which carbon is added to the outer skin of steel which can then be hardened.

19

Describe the process of case hardening by carburising.

-The component is placed in a carbon rich ceramic box.
-The atmosphere temperature is increased to 760° so the carbon atoms can enter the material's structure.

20

Give two examples of case hardening.

-Carburising
-Nitriding

21

Give two advantages of case hardening.

-Steels that don't have sufficient carbon for heat treating can be hardened.
-The process leaves a tough inner core.

22

Give a disadvantage of case hardening.

Grain growth occurs requiring the need for machining.

23

Give five advantages of nitriding.

-No additional hardening is necessary.
-It removes the chance of cracking
-Increased resistance to corrosion.
-Clean process.
-Economical for large numbers

24

Give two disadvantages of nitriding.

-High setup costs
-Potential for permanent loss of hardness.

25

Give two advantages of flame and induction hardening.

-Localised areas of the product can be hardened.
-Grain growth doesn't occur.

26

Give four examples of wasting processes.

-Sawing and filing
-Drilling and milling
-Grinding and sanding
-Blanking and piercing

27

Give three examples of addition processes.

-Bolts and screws
-Welding
-Adhesives

28

What are the four main types of redistribution processes?

-Casting
-Forging
-Forming
-Sintering

29

Give two examples of casting.

-Sand casting
-Die casting

30

Give two examples of hot forging.

-Drop forging
-Hot pressing