Modelling for Panel Line

The objects to be passed through the panel line (that means, the assembly parts) are derived from panels, generated in Hull using the ordinary modelling tools (that means, Hull Modelling for panels in the internal structure and Curved Panel Generation for shell structures). It is the model in combination with its break down into assemblies that forms the basis for the extraction of the assembly parts for the panel line. Thus, the definition of the assembly parts is a side effect of the assembly definition in Assembly Planning. A panel may be divided into one or several assembly parts, or a panel may be divided into assembly parts and piece parts, the latter to be fabricated as normal individual parts.

An assembly part is composed of all those piece parts within a panel which belong to the same assembly on the lowest level. These piece parts should be contiguous, that means, possible to combine into one big part.

When generating a panel it is divided into its piece parts by the seams of the panel. Those seams which form the limits between assembly parts are called assembly seams and will automatically be identified as such in PPANPARTS (see below). The only major restriction in generation of panels for the panel line is that an assembly seam must be an assembly seam along its full extension. Thus it must not along part of its length be a joint between different assembly parts and along another part be an internal seam in another assembly part. If such a situation should occur the seam must be split into two. (See the figure below showing a panel consisting of three assembly parts "A", "B" and "C". The seam "a", dividing assembly parts "B" and "C" must not continue into assembly part "A". It must be divided into two separate seams "b" and "c".)

Figure 1:1. Panel.

All piece parts to be included in an assembly part must be generated so that the surface to be turned upwards in the panel line are located in the same plane, that means, the side of an assembly part turned upwards must be planar.

For use in the panel line supposes that the excess may be defined in three different levels (see User's Guide Setup and customization, Bevel Excess and Weld, Excess and Excess Symbols.

The excess on level 3 (specified by the Hull Modelling default parameter EXC_TYPE_3) is supposed to be used on piece part level and will be cut off in the panel line, that means, this excess will not be included in the geometry of the resulting assembly parts (cf. below).

In general, the shape, size and main characteristics of the assembly parts are supposed to be such that they are possible to process in the panel line. This is the responsibility of the designer. The system will only check for violation of the formal conditions of assembly parts.