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Download Aluminium design and construction by John Dwight PDF

By John Dwight

This hugely illustrated e-book is a pragmatic layout advisor to the structural use of aluminum. The chapters contain this heritage of aluminum, variety of purposes, alloys and their homes. The ebook additionally offers with structural layout, and is a useful source for designers, with a number of diagrams, charts and examples.

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4 Dies Extrusion dies, which are made by the thousand, are in a special hard heat-resisting steel, the aperture being machined by spark erosion. The tooling cost for a straightforward structural die (non-hollow), 150 mm wide and without complications, might be roughly one-third of the cost of a tonne of the metal supplied from it. Skill is needed to make a die so that the section produced comes out more or less straight and level down the run-out table. 2, it is the aperture dimension at the entry side that controls the thickness.

The tool cost for producing a new section is a minute fraction of that for a new section in steel, as it merely involves cutting a new die. Also, the down-time at the press for a die change is negligible compared to the time lost for a roll change in the steel mill. In aluminium, it is therefore common practice to design a special dedicated section to suit the job in hand, or a ‘suite’ of such sections, and the quantities do not have to be astronomic to make this worthwhile. An important feature of aluminium extrusion is the ability to produce sections that are very thin relative to their overall size.

8118 restricts even the general grade to use with aluminium having a proof stress over 230 N/mm2. It is important that the mating surfaces should be flat, clean, free of defects, and also free from any substance that would reduce the development of friction, such as paint. Preferably, the surfaces should be grit-blasted. 6). Tightening procedures are as for joints in steel, either by controlled torque using a calibrated wrench, or else using the part-turn method. 4604. 3 Riveting In light-gauge construction, the decision whether to rivet or weld is slanted less towards welding than it is in steel.

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