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Metal Joining

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Metal Joining Metal joints can be temporary or permanent. Temporary joints include nuts and bolts magnetic catches and compressions joints as in wheel bearings. – PowerPoint PPT presentation

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Title: Metal Joining


1
Metal Joining
  • Metal joints can be temporary or permanent.
  • Temporary joints include nuts and bolts magnetic
    catches and compressions joints as in wheel
    bearings.
  • Permanent joints include riveting, soldering,
    welding and adhesives.

2
Mechanical Joining.
  • This refers to joining materials using nuts,
    bolts and rivets.
  • There are four different thread types or forms.

3
Mechanical Joining
  • The different parts of the isometric thread can
    be seen below.
  • When looking at working drawings the size
    of the thread to be used will be given as M5 or
    M6. The M. stands for metric meaning every
    dimension is in millimeters. The number gives the
    actual size of the finished thread .or the
    outside diameter.

4
Mechanical Joining
  • Bolts

5
Mechanical Joining
  • Nuts

6
Mechanical JoiningInternal threading
  • Holes can have threads cut into them allowing
    parts to be joined together, this is called
    tapping.
  • There are three types of tap
  • Taper Tap
  • This is used to start of the threads in the hole
    or to thread thin sheets. The first 5-6 threads
    are tapered making it easy to start the tap.
  • Second tap
  • This is used after the taper tap and is used to
    finish of the threads in deeper holes.
  • Plug tap
  • This tap has threads all the way down and is used
    to thread blind holes.
  • When threading a hole it must be drilled smaller
    than the tap to be used. When drilling you should
    refer to the chart next to the drilling machine

7
Mechanical Joining.
  • Tap and wrench.

8
Mechanical JoiningExternal threading
  • Bars or shafts can have threads cut into them
    using split dies.
  • Here the die is placed in a stock. The top of the
    bar is usually tapered making it easy to start
    cutting the threads. When starting the thread it
    is important to start the thread straight so as
    to cut a square thread.
  • The split die has writing on one side and this
    must be face down when threading.
  • Hard materials such as steel require oil or
    grease to be used to lubricate the cutting
    process.
  • When cutting threads on a bar or shaft the bar
    must be the same size as the split die being
    used. For example cutting an M10 thread requires
    a diameter 10 bar.

9
Mechanical Joining
  • Split die and stock.

10
Mechanical Joining Riveting
  • Rivets can be solid or pop rivets.
  • Solid rivets come in four different forms Round
    or snap, countersunk, pan or flat head.
  • Solid rivets form a very strong joint and were
    commonly used in producing gates, ships and
    bridge panels.
  • Pop rivets are much more common now. They are
    used in the manufacture of aero planes and are a
    very quick way to join materials.

11
Mechanical Joining. Riveting
  • page 97
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