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CLASSIFICATION OF METAL FORMING PROCESSES ACCORDING TO TYPEOF STRESS EMPLOYEDPrimary metal working processes are those in which the bulk material in the form of ingots, blooms andbillets is broken down to required shapes and sizes by processes such as forging, rolling, extrusion etc.These processes can be categorised on the basis of the kind of stress employed in the material, that is:(i) Mainly compression type, (Examples: forging, rolling, extrusion etc.).(ii) Mainly tension type (Example: drawing).(iii) Combined compression and tension type, (Examples : deep drawing, embossing etc.).Many of these processes are shown schematically in Fig. 1.2.
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