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Assembly Line Balancing Assembly Line Balancing Introduction to Industrial Engineering The Line Balancing

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									Assembly Line Balancing



   Introduction to Industrial
         Engineering
The Line Balancing Problem
   The problem is to arrange the individual
    processing and assembly tasks at the
    workstations so that the total time
    required at each workstation is
    approximately the same.
   Nearly impossible to reach perfect
    balance
Things to consider
   Sequence of tasks is restricted, there is
    a required order
   Called precedence constraints
   There is a production rate needed, i.e.
    how many products needed per time
    period
   Design the line to meet demand and
    within constraints
Terminology and Definitions
   Minimum Work Element
   Total Work Content
   Workstation Process time
   Cycle Time
   Precedence Constraints
   Balance Delay
Minimum Work Element


   Dividing the job into tasks of a
    rational and smallest size
   Example: Drill a hole, can’t be
    divided
   Symbol – Time for element j: Tej
             is a constant
     Tej
Total Work Content
   Aggregate of work
    elements

                 n
    Twc   Tej
                j 1
Workstation Process time


   The amount of time for an individual
    workstation, after individual tasks have
    been combined into stations
   Sum of task times = sum of workstation
    times
Cycle time
   Time between parts coming off the line
   Ideally, the production rate, but may
    need to be adjusted for efficiency and
    down time
   Established by the bottleneck station,
    that is station with largest time
Precedence Constraints
   Generally given, determined by the
    required order of operations
   Draw in a network style for
    understanding
   Cannot violate these, an element must
    be complete before the next one is
    started
Balance Delay
   Measure of line
    inefficiency due to
    imbalances in
    station times            nTc  Twc
                          d
                               nTc
Method – Largest Candidate Rule
   List elements in descending order of T
   Assign elements to first station, from top
    to bottom of list, minding constraints, and
    not causing sum to exceed cycle time
   Continue assigning elements to stations
    where each station < cycle time, largest
    assigned first, until all assigned
   EXAMPLE

								
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