Sheet metalwork application

The design of components to be manufactured from folded sheet metal is a field in which CAD systems can offer great assistance.
In the case of the bracket shown in Fig. 3.3 it would first be necessary to establish the overall dimensions of the part.
The second step would be to imagine that the bracket is folded back gradually as indicated in Fig. 3.4 into the flat sheet form. This shape would then be stamped from metal strip in a power press.
The dimensions of the flat pattern have to make allowance for the bend radius, the metal thickness and
the type of metal used. Metals behave quite differently when bent and the CAD system can be programmed to calculate an appropriate bend allowance. After stamping the bracket can be refolded with suitably radiused bends.
In this particular case the dimensions of the stamping are also needed for the design of the press tool set.
The design can be checked for material accuracy, weight, volume, and so on, before being committed to
manufacture. Computerized programs can be produced to operate lathes, mills, flame cutting machines, etc. and many other items of equipment in the manufacturing process. Models may be constructed in several different ways, including: geometric modelling, meshed surfaces, sweeps, volumes of revolution and ruled surfaces. Each of these is summarized below.













  • Manual of
    Engineering Drawing
    Second edition
    Colin H Simmons
    I.Eng, FIED, Mem ASME.
    Engineering Standards Consultant
    Member of BS. & ISO Committees dealing with
    Technical Product Documentation specifications
    Formerly Standards Engineer, Lucas CAV.
    Dennis E Maguire
    CEng. MIMechE, Mem ASME, R.Eng.Des, MIED
    Design Consultant
    Formerly Senior Lecturer, Mechanical and
    Production Engineering Department, Southall College
    of Technology
    City & Guilds International Chief Examiner in
    Engineering Drawing



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