1. MANUFACTURING TECHNOLOGY Week 1 Introduction to Manufacuring

2. What Is Manufacturing Derived from Latin words: Manus (Hand); Factus (Make) Means: Made by hand

3. Manufacturing- Definition Technological: Application of physical and chemical processes to alter the geometry, properties and/or appearance of a given starting material to make parts or product. Economic: Transformation of materials into items of greater value by means of one or more processing and/or assembly operations. Raw Material Physical/Chemical Processes Final Product Shape Change Value Addition

4. Manufacturing Vs Production The terms manufacturing and production are often interchangeably used Production has a broader meaning than manufacturing Term Production is used to indicate the output of continuous processes: oil production, cement production, chemical production. Term manufacturing is not used normally. In case of making discrete (separate) components as automobile/ aero-plane parts, usually the term Manufacturing is used. However, production is also acceptable in this case. Involvement of hand is more in manufacturing than in production

5. Materials in Manufacturing 1. Metal: Term metal is derived from Greek word métallon, which means an open excavation or pit from which stone is obtained by digging, cutting, or blasting. It is an element or compound or alloy that is a good conductor of both electricity and heat. Metals are usually shiny, malleable and ductile. Types: Ferrous (iron based); Non-ferrous 2. Ceramic: A compound containing metallic & non-metallic (Oxygen, Nitrogen, Carbon) elements Types: Crystalline ceramics ; Glasses

6. Materials in Manufacturing- Contd 3. Polymer: Compound formed of repeating structural units called mers whose atoms share electrons to form very large molecules. - Polymers consist of C plus one or more other elements (H, O, Cl) Types: Thermoplastic (Polythene, Nylon); Thermosetting (Resins, Epoxies); Elastomer (rubber, silicone). 4. Composites: Mixtures of other three types - A material consisting of two or more phases that are processed separately and then bonded together to achieve properties superior to those of its constituents. - The usual structure of a composite consists of particles or fibers of one phase (homogeneous mass of material that has distinct properties) mixed with other, called matrix.

7. Mechanical Properties of Engineering Materials The properties of a material which determine its behavior when it is subjected to mechanical stresses Include strength, modulus of elasticity, hardness, toughness, ductility, etc Objective in Design Phase -> Withstand the stresses without significant changes in geometry Objective in Manufacturing Phase -> Apply the stresses that exceed the yield strength so as to change the shape of the part