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pin patchJointed) the casing of the drawing tube is pressed. The tube
is then partly unfolded, or rolled over, with a special clamp
that is usually made of
bronze with brass balls mounted on one edge of the clamp
(fig. 10).
After the casing has been
rolled over the heating at the end of the drawing tube is put
on, and a group of tests is made to test the strength of the
casting. If the test is successful the casing is opened, and
the drawing tube has its now hollow, cone-shaped end inserted
into the tube and the next step is to roll the tube over the
mould. The drawing tube is heated by a charcoal flame, and the
mould is heated by steam in order to increase the bonding
between the drawing tube and the mould (fig. 11).
The heating is now
continued until the required temperature has been reached, the
steam blowing is stopped and the drawing tube is opened to
examine the result. The drawing tube is now cut off and
re-heated until it becomes soft and can be bent without it
breaking, the mould is opened, and the object is removed from
it.
In the method
above described the drawing tube is heated by one flame, and
when the temperature reaches the prescribed value the next
process is started, and the object is removed from the mould
when the temperature of the drawing tube has been raised to a
certain value (the temperature varies between 1200 - 1500°C).
In the alternative
method described below, the heating is done by two flames.
The first method is
very economical, but it has the disadvantage that the first
flame heats both the mould and the drawing tube, and if the
flame burns away the mould too much, it is not possible to
obtain the desired temperature of the mould, since the second
flame is only used to heat the drawing tube.
The second
method is the method currently used for casting in modern
foundries, and it does not have the above mentioned
disadvantages, but it has the disadvantage that the drawing
tube is heated at a much lower temperature than the mould, and
also that the drawing tube takes a longer time to reach the
required temperature.
There are also two
other kinds of drawing tubes, both of which have a thicker
wall. The first is the graphite tube, and the second is the
carbon sheet-furnace drawing tube.
In these tubes the
wall is made of graphite or graphite mixed with powdered
copper, and the heating is done by a charcoal flame that is
turned around the wall in the same way as in the flame
drawing tube.
Compared to the
first method, the graphite tube is much harder and takes a
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