Metal Surface Finishes Flashcards Preview

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Flashcards in Metal Surface Finishes Deck (23):
1

What are Abrading Tools used for?

Used to cut away very small particles of material

2

What are Files used for?

Smooth and shape surface of metals and hard plastics by pressing and dragging the hundreds of small teeth on file across material

3

What are Files made from?

Hardened and Tempered cast steel so they'll cut other metals

4

Why should Files be treated with care?

They are brittle
Can snap if dropped/abused

5

What different shapes do files come in?

Flat
Half Round
Square
Round
Three Square

6

What also versions of each different file shape are there?

Warding and Needle versions - very small - used for jewellery

7

What are the different sized teeth of Files?

Rough
Bastard
Second cut
Smooth cut
Dead smooth

8

What is Cross filing?

Removes metal quickly with file moving end to end to bring rough material to shape

9

What is Draw filing?

Finishing process with the file moving from side to side which removes less material and leaves finer surface

10

How is Abrasive Paper made?

Small chips of abrasive material are glued onto a paper/cloth backing sheet
Abrasive material usually silicon carbide or emery

11

What is Emery Cloth?

Abrasive
Designed for use on metals, sometimes used on plastics
Torn into strips

12

What are Linishers?

Sanding machines that are designed for abrading metals
Have continuous belt of abrasive moving across plate

13

What is the relationship between the number of the abrasive paper and the coarseness of the sheet?

Lower the number, the coarser the sheet

14

What is Metal Polish?

Slightly abrasive because it relies cutting away the surface of the metal until it's very smooth

15

What forms can Metal Polish be in?

Liquid form (applied with cloth)
Wax bar (applied to buffing wheel)

16

What is the most common thermoplastic powder used for Plastic Dip-Coating?

Polythene

17

What is the method of Plastic Dip-Coating?

Air is blown through powder to make it behave like liquid
Metal (preheated to 180degrees) is dipped into fluidised powder
Metal is returned to oven where plastic coating melts to form smooth finish

18

What is Powder Coating?

Industrial Finish
More sophisticated version of dip coating
Powder sprayed onto products which then pass through oven

19

What does Modern Powder Coating provide?

Hard paint like finish
Available in all colours and translucent
Very durable

20

What is Anodising?

Used on Aluminium to provide durable corrosion resistant finish

21

What does Anodising involve?

It involves electrolysis and uses acids and electric currents which are hazardous in school workshops

22

What is Plating?

Uses electrolysis
Many forms - Chromium Plating = most common
Thin layer of metal on surface provides durable finish resistant to corrosion

23

What is Galvanising?

Dipping metal (usually mild steel) into a bath of Molten Zinc
Zinc provides a very corrosion resistant finish