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MTM0070 Materials engineering

MTM0070 Materials engineering

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What are the main features of gravity die-casting compared to the sand mold casting?

intensive cooling of the casting provides a fine-grained structure

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it is possible to obtain very complex shape castings

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no pliability of the mold

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How is such a defect called in casting?

Common defects of investment castings

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Which of the following casting methods is best for single series production?

sand casting

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die casting

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permanent-mold casting

centrifugal casting

plaster casting

What are the disadvantages of injection molding?

high flow speed (over 130 m/s)

can be used for only alloys with low melting point (Al, Mg, Cu, Zn-alloy)

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porosity due to gas and shrinkage

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reduced weight of castings (up to 50 kg)

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What do drawing and rolling processes have in common?

possibility to produce spherical parts

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possibility to make seamless tubes

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possibility to produce sheet metal

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possibility to manufacture welded tubes

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By what temperature are cold and hot working of metals separated?

0,2 Tm

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0,1 Tm (melting temperature)

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0,4 Tm

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recrystallization temperature

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What casting method gives the most precise and best quality surface of castings?

sand mold casting

shell mold casting

pressure die-casting

centrifugal casting

Sheet forming disadvantages are:

cold processing

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requirement for workers with high qualifications

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a narrow range of source material

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complexity and high cost of tools

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What are the principal operations in investment casting method?

ceramic layer formation over the surface of the pattern, heating of the ceramic layer, removing the pattern

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formation of layer around the pattern, drying of the mold, strengthening of the mold (by heating)

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producing pattern, strengthening of the pattern (by heating), formation of the layer around the pattern

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producing wax pattern, ceramic layer formation over the surface of the pattern, wax pattern melting and removing from the mold

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Which methods of forming processes are continuous?

drawing and stamping

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rolling, extrusion, drawing

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extrusion and open-die forging

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rolling and deep-drawing

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