Lesson Notes By Weeks and Term v4 - SHS 3
Manufacturing Processes
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Manufacturing Processes
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Subject: Manufacturing Engineering
Class: SHS 3
Term: 1st Term
Week: 10
Grade code: 1.3.2.LI.2
Strand code: 3
Sub-strand code: 2
Content standard code: 1.3.2.CS.1
Indicator code: 1.3.2.LI.2
Theme: Manufacturing tools, equipment and processes
Subtheme: Manufacturing Processes
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This lesson introduces three fundamental manufacturing processes: rolling, forging, and extrusion. These are known as bulk deformation processes, which means we take a large, solid piece of metal (a billet, slab, or bloom) and change its shape significantly without cutting or melting it. Think about the iron rods used to build our homes, the aluminium frames for our windows, or the strong metal parts inside a car engine. Many of these essential items are made using the very processes we will study today.
A. What is Bulk Deformation?
Before we look at the specific processes, we must understand the main idea behind them.
Bulk Deformation refers to a group of metal forming processes where the starting material (a large, solid piece of metal) undergoes significant plastic deformation to change its shape. "Bulk": This means the process works on solid, three-dimensional pieces of metal, not thin sheets. The surface area-to-volume ratio of the starting material is small. "Deformation": This means we are changing the shape of the metal by applying massive force. "Plastic Deformation": This is a permanent change in shape. Imagine bending a thick piece of wire; when you let go, it stays bent. This is plastic deformation. We are not just temporarily bending it (elastic deformation).
A key principle of bulk deformation is that the volume of the metal remains constant. We are just rearranging its shape. For example, if you have a short, thick block of metal and you roll it into a long, thin bar, the total volume of metal is the same. B. Rolling