Page 145 - Ship Construction.DJ Eyres 6Ed

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Ch13-H8070.fm Page 134 Wednesday, October 18, 2006 6:56 AM
134 Ship Construction
floor situation. For example most robots are now available with some form
of ‘adaptive control’ which provides feedback from the environment per-
mitting, say, automatic adjustment of the robots path and/or its functions.
Also the provision of ‘off-line’ programming and simulation packages makes
it possible to develop and test programs for the robot remotely. Thus the
robot carries on working whilst new programs are produced for it.
Many of the worlds shipyards and shipyard systems suppliers have been
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developing and implementing robots in shipbuilding. A large proportion of
these developments have been in fully automating the machine welding
processes described in Chapter 9 but other areas of adoption and trial have
manufacturing cost. ้องสมุด ศูนย์ฝกพาณิชย์นาวี
involved flame and plasma-arc cutting, local shot-blasting and painting, and
marking. Robots developed to date for shipyard usage are either associated
with large gantry structures or are small portable units. The former often
have the movable robot mounted on the travelling gantry with sensors
providing the adaptive control and are employed for cutting and welding
processes. The latter can be manually transported, or self propelled even
climbing vertically, or for robotic transportation, and have been used for
local welding in difficult situations and cleaning and painting.
Both the gantry mounted and portable robotic units are commonly fea-
tured in automated shipyard production units for panel, sub-assembly and
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unit fabrication now available to shipyards from specialist manufacturers.
Many of the early and existing robot programming systems are linked to
the shipyards CAD system so that programs developed for the robot can be
run ‘off line’ with the 3-dimensional graphics simulating the robots perfor-
mance before it is put to work. A more recent patented development has
seen the introduction of a robotic welding unit controlled by an advanced
machine vision-guided programming system. This is claimed to reduce pre-
programming times to zero and no CAD models are required.
Whilst robots have advantages in their use in difficult and unpleasant
work conditions and tedious repetitive work situations, their development and
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adoption is increasingly seen as a means to higher productivity and reduced