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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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Which technology would be best suited for production of following component?

Image failed to load: What you need to know about the High Pressure Die Casting -

Automated cutting. Enables production of complex shapes and large variety of materials can be used.

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Casting. Suitable for complex-shaped products, good dimensional accuracy and can provide vibration damping.

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Forging. Technology is best suitable for complex-shaped products and provides good surface quality and high strength.

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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)

porosity due to gas and shrinkage

reduced weight of castings (up to 50 kg)

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How is such a defect called in casting?

Common defects of investment castings

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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

What do drawing and rolling processes have in common?

possibility to produce spherical parts

possibility to make seamless tubes

possibility to produce sheet metal

possibility to manufacture welded tubes

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Sheet forming disadvantages are:

cold processing

requirement for workers with high qualifications

a narrow range of source material

complexity and high cost of tools

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

0,2 Tm

0,1 Tm (melting temperature)

0,4 Tm

recrystallization temperature

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How do products produced with cold working compare to the hot working products:

higher dimensional tolerances

better surface quality and more precise dimensions

inferior surface quality

higher machining allowance

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Which type of sheet forming operation is used to make bowl-shaped products?

drawing

embossing

notching

deep drawing

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