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Manufacturing Engineering

Manufacturing Engineering. Objectives: Create product structure charts, BOM’s and routing sheets Determine appropriate manufacturing process Evaluate product cost. Product Structure Chart. “What goes into what”

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Manufacturing Engineering

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  1. Manufacturing Engineering Objectives: Create product structure charts, BOM’s and routing sheets Determine appropriate manufacturing process Evaluate product cost

  2. Product Structure Chart • “What goes into what” • The product is comprised of sub-assemblies, sub-subassemblies, components and raw materials • Lines represent processes or operations required to go to the next level • Figure 3.1 on p. 46

  3. Bill of Materials • Number and name of each part • Source of each part • Title – number and name of completed product • Separate BOM for subassemblies • Example, Figure 3.2 and 3.28

  4. Route Sheet • Set of instructions to the plant showing how to manufacture the product • Machine • Time • Operation description • Fig. 3.9 and 3.30 (example)

  5. Manufacturing Processes • Refining and Alloying • Casting • Metal Forming • Metal Cutting • Welding • Assembly • Finishing

  6. Evaluating the Cost • Fixed Costs – not dependent on number of parts made • Purchase cost of machines, installing, space • Variable Costs – are dependent on # of parts • Operator’s, running the machine, material • Cost Estimating (page 70) • Direct material and labor, overhead • Overhead factor - % of direct labor

  7. Refining and Alloying Properties often tested for in metals: • Tensile strength • Hardness • Impact resistance • Malleability • Fatigue Resistance • Corrosion Resistance

  8. Casting • Process of forming objects by pouring liquid material into a mold and letting it solidify • See Sand Cast mold and parts • Small quantities • Specialized methods for large quantities, examples are die casting, centrifugal casting and pressed casting

  9. Metal Forming • Rolling • Wire Drawing • Forging • Extrusion • Bending • Drawing and Stretching

  10. Metal Cutting • Shearing • Turning • Drilling • Shaping and Planing • Milling • Broaching • Sawing – Filing • Grinding

  11. Welding • Electric Arc • Resistance Welding • Beam Welding • Thermit Welding • Pressure Welding • Gas Welding • Brazing and Soldering

  12. Assembly • Welding • Gluing • Riveting • Screwing • Force fitting • Batch or continuous

  13. Finishing • Honing and lapping • Polishing, buffing, brushing, tumbling • Surface cleaning and coating • Painting • Plating • Metallizing and Chromating

  14. Product Costing • Direct Material • Direct Labor • Overhead • Using a planning sheet • Other costs???

  15. Evaluating Cost and Breakeven • Total cost = FC + VC x # units • Fixed costs: Machines, Jigs and Fixtures, Buildings • Variables costs: labor, materials • Compare 2 processes, see example on page 51-52

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