Mat. Sci. Politeknik:Metal Fabrication 1

2 types of metal fabrication process (choose 2)

• Casting

• Metal works

• Cutting

• Metallurgy

Define metal works

• metal forming process by elastic deformation

• metal casting process by heat treatment

• metal forming process by plastic deformation

• metal transformation

Hot work​ ​ (a)   ​ ​ (b)   ​ (c)  

• rolling
• forging
• extrusion
• drawing
• casting

Match the following diagram with the correct process.

• Drawing

• 
• Forging

• 
• Extrusion

• 
• Rolling

• 
• Sand casting

• 

Differences betweem cold and hot work. Choose the correct answer.

• hot work: above recrystallization temperature

• cold work: produce internal stress in metals

• hot work: cheaper

• cold work: recovery and deformation takes place simultaneously

Define hot works

• metals are plastically deformed above the recrystallization temperature.

• metals are elastically deformed below the recrystallization temperature.

• metals are plastically deformed below the recrystallization temperature.

• materials have large deformation.

Define cold works

• metals are plastically deformed above the recrystallization temperature.

• metals are elastically deformed below the recrystallization temperature.

• metals are plastically deformed below the recrystallization temperature.

• materials have large deformation.

What id forging process?

• metals is hammered into a desired shape.

• metals is pressed into desired shape.

• repeatedly striking force against the surface of the metal.

• metals have large deformation.

Define extrusion process.

• metals is forced from an enclosed cavity by compressive force.

• compressive force applied by a ram.

• reduced cross-section area.

• good surface finish so that no further machining.

What is rolling ?

• passing a piece of metal between two rollss

• the metal thinned and elongated

• forced from enclosed cavity via die

• pulling a workpiece through an open die