Metals

Metals

1. Properties

   • hard
   • often shiny
   • non-adhesive
   • cold and smooth

2. Obtention

   • surface mining
   • underground mining
   • metals are taken from minerals contained in rocks

3. Clasification

   • ferrous
     • are common
       • contain iron
     • iron alloys (by adding carbon)
       • Pure iron
         • not much carbon
       • Steel
         • harder and stronger than iron
       • Cast iron
         • a lot of carbon
   • non-ferrous
     • light and ultra-light
       • aluminium
       • titanium
       • magnesium
     • heavy
       • lead
       • zinc
       • tin
       • bronze
       • copper
       • brass

4. Working with metals

   • shaping
     • rolling
     • extrusion
     • forging and press forging
     • punching
     • bending
     • wire drawing
     • powder metallurgy
     • casting and centrifugal casting
   • marking
     • centre punch
   • cutting
     • circular saw
   • drilling
     • drill
   • joints
     • permanent
       • rivet
       • adhesives
       • press fit joint
       • welding
     • temporary
       • nuts and bolts
       • screws
       • threaded stay bolts
       • keyed joints
       • splined shafts
       • sliding joints
   • shaping/turning
     • chisel
   • rough finishing
     • file
   • finishes
     • grinding
     • lapping
     • polishing
     • buffing
     • coatings

5. alloys

   • mixture of 2 or more chemical element
     • the primary element is a metal