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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”
 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
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
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)
Manufacturing Processes
 Refining and Alloying
 Casting
 Metal Forming
 Metal Cutting
 Welding
 Assembly
 Finishing
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
Refining and Alloying
Properties often tested for in metals:
 Tensile strength
 Hardness
 Impact resistance
 Malleability
 Fatigue Resistance
 Corrosion Resistance
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
Metal Forming
 Rolling
 Wire Drawing
 Forging
 Extrusion
 Bending
 Drawing and Stretching
Metal Cutting
 Shearing
 Turning
 Drilling
 Shaping and Planing
 Milling
 Broaching
 Sawing – Filing
 Grinding
Welding
 Electric Arc
 Resistance Welding
 Beam Welding
 Thermit Welding
 Pressure Welding
 Gas Welding
 Brazing and Soldering
Assembly
 Welding
 Gluing
 Riveting
 Screwing
 Force fitting
 Batch or continuous
Finishing
 Honing and lapping
 Polishing, buffing, brushing, tumbling
 Surface cleaning and coating
 Painting
 Plating
 Metallizing and Chromating
Product Costing
 Direct Material
 Direct Labor
 Overhead
 Using a planning sheet
 Other costs???
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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Manufacturing Engineering.ppt

  • 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