aluminium composite roof Overall fabrication works
6. Overall fabrication works
(1) Typical fabrication process
Actual fabrication work of a Aluloyal aluminium composite roof panel is an integrated work consisting of various machining procedures, assembling and inspection. Fig 3-27 is typical fabrication process for a standard tray type (rout and return) Aluloyal panel.
(2) Fabrication drawing
We have to prepare fabrication drawings prior to every fabrication work. Fabrication drawings specify details of processing and assembly method of each Aluloyal panel. Normally, we specify the following items in fabrication drawings.
Raw Aluloyal panel (thickness, color, dimension) to be used for the fabrication.
Panel name, shape, dimensions and quantity of the completed panel.
Cutting, grooving and other processing details including its coating direction.
In addition to the above items, we can get unspecified information about subsidiary materials from fabrication drawings through simple calculations. Thus, we can use fabrication drawings not only for processing and assembly of Aluloyal aluminium composite roof panel but also for preparation of subsidiary materials, final inspection work of completed panels and some office work including inventory control of raw Aluloyal panels.
Fig3-28 above shows an example of a fabrication drawing and the actual panels based on the drawing. Fabrication drawings are normally prepared for internal use, and so, many other forms are successfully used. However, every form should facilitate the drawing work and should be easily understood without confusion.
(3) Adjustment of dimensions
Aluloyal panels elongate though folding and bending. Generally, we find the following elongations:
In folding after grooving: 0.5-1.0mm per point
In 3-roll bending: 0.3-0.4%of arc length (300-700mmR)
In order to compensate the elongation, we have to adjust (shorten) the cutting and grooving position based on the fabrication drawing. Thus, the actual cutting and grooving dimensions are smaller than those of the complete panel. As the elongation values depend on the grooving shape and bending method, we have to determine the exact values by pre-testing.
(4) Panel details
When we work with fabrication drawings, we have to determine the fabrication details of Aluloyal aluminium composite roof panels. Normally, the details applicable to Aluloyal aluminium composite roof are slightly different from solid aluminum panels, mainly because Aluloyal panels are pre-coated products, while solid aluminum panels are post-coated products. Some panel details may need approval from customers with the fabricated samples showing the details. We will look over some of the main details below.
specification
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