Processing of Metals

• Engineering
• Further Education (Key Stage 5)

Processing of Metals

By Kyle Smith (Lecturer & Foundry Engineer)

Todays Objectives

Define what is meant by mechanical forming/processing.

Explain the processes: 1) Hot Rolling & 2) Cold Rolling 

Identify key differences in the rolling processes.

Examine physical differences of metal specimens.

What is your definition of forming something or processing something?

Ways to 'Form/Process Metal.

Deformation

Force application.

Distortion occurs (material still elastic state)

Force removal - original shape maintained.

Deformation Cont'

Force application.

Distortion occurs (material pushed past yield point)

Force removal - deformed shape.

**Slip has occurred in atomic lattice along the slip bands**

• Slip planes are used up until none remain and fracture will occur - Before this, the metal is work-hardened.
• Metal is strong and hard in this condition but has lost its ductility. Recovery in the form of annealing

What are the three key elements in metal deformation?

What is a slip band?

Hot Rolling & Cold Rolling

Case Study in Pairs

uomustansiriyah.edu.iq

Describe what the rolling process is.

What three forms do the ingots come in before they meet the rollers?

What are the key elements of a 'Hot Rolled' metal?

What are the key elements of a 'Cold Rolled' metal?

Workshop Visit

Machine-shop

What forms (shape) of material are present?

Show me the following

Hot Rolled Steel.

Cold rolled Steel.

Rolled Aluminium.

What three points can we take from todays lesson?