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Automated Manufacturing Cell

Automated Manufacturing Cell. Source : John S. Usher class notes. Flexible Manufacturing Systems. Automated machining operations, tool changers Automated material handling, computer control Designed around size of parts processed & average processing time for parts

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Automated Manufacturing Cell

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  1. Automated Manufacturing Cell Source: John S. Usher class notes

  2. Flexible Manufacturing Systems • Automated machining operations, tool changers • Automated material handling, computer control • Designed around size of parts processed & average processing time for parts • Can process wide variety of items quickly • Very few large systems exist • Progressive layout – all parts same route • Closed loop – larger variety, alternative routes • Ladder layout – two machines work on same part • Open field layout – most complex

  3. Qualitative flow data • Relationship chart • A absolutely necessary • E especially important • I important • O ordinary • U unimportant • X undesirable • Percentages of A. E, I, O, U and X ratings • A 2-5% • E 3-10% • I 5-15% • O 10-25% • U 25-60% • X depends

  4. Qualitative flow data • Color coding relationships • A Red • E Orange or Yellow • I Green • O Blue • U Uncolored • X Brown

  5. Sample relationship chart

  6. Quantitative flow data • From-to frequency of trips matrix

  7. Quantitative flow data • Frequency of trips between departments matrix

  8. Distance Measures • Euclidean • Squared Euclidean • Rectilinear • Tchebychev • Aisle distance • Adjacency • Shortest Path

  9. Euclidean, Squared Euclidean, Rectilinear and Tchebychev

  10. Aisle Distance, Adjacency and Shortest Path

  11. Layout evaluation criteria • cij cost of moving a unit load of material unit distance between departments i and j • fij number of loads or trips required between departments i and j • dij distance between departments i and j

  12. Formula for cij • r number of MHD types • m number of machines (not machine types) • fijk number of trips required to transport material from machine i to j via MHD k • dij distance from machine i to j, for a given layout (in feet) • TLk average percentage of time MHD k travels loaded • LULTk average loading and unloading time per move with MHD k (in minutes) • Sk average speed of MHD k (feet per minute)

  13. Formula for cij • Yijk1 if MHD k is used to transport material from machine i to machine j; 0 otherwise • Nk number of units of MHD k • Ck investment/leasing cost for MHD k per year • OPk labor plus non-labor (fuel, power, maintenance) cost to operate MHD k per minute • Tijk time to transport material from machine i to j via MHD k per trip (in minutes) • MHCijk total material-handling cost to transport material from machine i to j via MHD k • MHRijk material-handling cost per unit distance per trip to transport material from machine i to j via MHD k

  14. Formula for cij

  15. Tools for presenting layout design • Drawings • Templates • Three-dimensional physical models • CAD models

  16. Templates

  17. Machine dimensions

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