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Machine Design

Machine Design. What is the importance of Machine Design for engineers?. What is Machine Design?. Creation of new and better machines AND Improving existing ones So that it is economical in the cost of production and operation. Machine Design. How a design is born. Market survey.

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Machine Design

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  1. Machine Design What is the importance of Machine Design for engineers? What is Machine Design? Creation of new and better machines AND Improving existing ones So that it is economical in the cost of production and operation.

  2. Machine Design How a design is born Market survey Aesthetic marketability Ease of handling Requirement Safety Availability of FUNDS Creation Economical Model (Rough idea) Available material Recyclability Manufacturing resources Analysis Material/s used Force/stress Sizes

  3. What is the basic knowledge required for Machine Design? • Mathematics • Engineering Mechanics • Strength of Materials • Mathematics • Engineering Mechanics • Strength of Materials • Workshop Processes • Engineering Drawing • Computing • Finite Element Analysis, Computational Fluid Dynamics etc • Mathematics • Engineering Mechanics • Strength of Materials • Workshop Processes • Engineering Drawing • Mechanics of Machines • Mechanics of Materials • Fluid Mechanics & Thermodynamics

  4. 1. Type of LOAD and STRESSes caused by the load Important considerations in Machine Design • Dead loads • Stress and strain • (Tensile, compressive, shear) • Live loads • Thermal stresses Steady loads Variable loads • Torsional stresses • Shock loads (suddenly) • Bending stress • Impact loads (applied with some velocity)

  5. 2. KINEMATICS of the machine (Motion of the parts) Important considerations in Machine Design….. Find the simplest arrangement that would give the most efficient motion that is required. 3. Selection of MATERIALs Knowledge of the properties of the materials and their behaviour under working conditions is required. Strength, hardness, durability, flexibility, weight, resistance to heat and corrosion, electrical conductivity, machinability, etc.

  6. 3. Selection of MATERIALs Non-metal Important considerations in Machine Design….. Metal Ferrous Non-ferrous Physical properties: Density, Melting point, Elec/thermal properties • Mechanical properties: • STRENGTH – resist externally applied loads without breaking • or yielding • STIFFNESS – resist deformation under stress • ELASTICITY – regain original shape once the force is removed • PLASTICITY – property which retains deformation (required for • forging etc) • DUCTILITY – ability to be drawn into a wire by a tensile force • BRITTLENESS – sudden breaking with minimum distortion • TOUGHNESS – resist fracture due to high impact load • CREEP – deformation under stress and high temperature • FATIGUE – ability to withstand cyclic stresses • HARDNESS – resistance to wear, scratching, deformation, • machinability etc

  7. Important considerations in Machine Design….. 4. Form and size of the parts Use I-beam or Angle-iron? The size will be determined by the forces/torques applied (stresses on the object) and the material used such that failure (fracture or deformation) would not occur

  8. General procedure in Machine Design….. Need or aim Recognize and specify the problem Select the mechanism that would give the desired motion and form the basic model with a sketch etc Synthesis Analysis of the FORCES Material selection Determine the stresses and thereby the sizes of components s.t. failure or deformation does not occur Design of elements Modification Modify sizes to ease construction & reduce overall cost Production Detailed drawing

  9. Syllabus and method of evaluation

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