Page 141 - Ship Construction.DJ Eyres 6Ed
P. 141
Ch13-H8070.fm Page 130 Wednesday, October 18, 2006 6:56 AM
130 Ship Construction
1 2
Apply heat Expansion
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3 4 Single plane bending
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
Bend
Contraction
Two plane
bending
ึ
Heat line bending principle
Beam applying load
Top PLATE ROLLS
roller
Plate
Driven Driven
roll roll
FIGURE 13.3 Forming shell plates
and the two lower rolls have adjustable centres. With modern bending rolls,
plates up to 45 mm thick may be handled and it is possible to roll plates to a
half circle. These large rolls are also supplied with accessories to allow them
to undertake heavy flanging work with the pressure exerted by the upper
beam, for example, ‘troughing’ corrugated bulkhead sections.
