Question

steel is the most suitable material for mould fabrication - justify.​

Answer 1

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Problems associated with the texturing or polishability of a mold cavity can often be traced back to the mold steelmaking process. The material properties that have shown the greatest influence on obtaining a good surface finish are the microcleanliness level, the severity of chemical segregation and the appearance of primary carbides.

SOME FACTS ABOUT IT:-)

Many industries place strict requirements on the acceptable level of surface defects and imperfections that may appear on a plastic molded part. Such conditions often apply to critical components for the medical and pharmaceutical industries as well as for the manufacturers of lenses and other optical devices. However, for aesthetic reasons, many other consumer goods have similar restrictions. After all, any defect that appears on the surface of the mold steel is likely to be replicated onto the molded part.

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Answer 2

Explanation: Casting processes: Moulding materials and their requirements; Patterns:

Types and various pattern materials. Various casting methods, viz., sand

casting investment casting, pressure die casting, centrifugal casting,

continuous casting, thin roll casting; Mould design; Casting defects and

their remedies.

Metal forming processes: Various metal forming techniques and their

analysis, viz., forging, rolling, extrusion, wire drawing, sheet metal

working, spinning, swaging, thread rolling; Super plastic deformation;

Metal forming defects.

Metal joining processes: brazing, soldering, welding; Solid state welding

methods; resistance welding; arc welding; submerged arc welding; inert

gas welding; Welding defects, inspection.