assembly line balancing

ASSEMBLY LINE BALANCING MODUL 7 What is Line Balancing ??  Assigning each task to a work within an assembly line in order to meet the required production rate and to achieve a minimum amount of idle time.  Line balancing is the procedure in which tasks along the assembly line are assigned to work station so each line has approximately same amount of work. Terms Defined  Delay/idle time of a workstation: the difference between the cycle time (CT) and the station time (ST).  Cycle time (CT): the time between the completion of 2 successive assemblies, assumed constant for all assemblies for a given conveyor speed. Terms Defined (Cont.)  Line efficiency (LE): the ratio of total station time to the cycle time multiplied by the number of workstations  Balance Delay  Balance Delay  Work element: a part of the total work content in an assembly process. Terms Defined (Cont.)  Smoothness index (SI): an index to indicate the relative smoothness of a given assembly line balance. A smoothness index of zero indicates a perfect balance  Workstation (WS): a location on the assembly line where a work element or elements are performed on the product. Precedence Constraint  Precedence Constraint is a restriction on the order of execution of work elements.  There are two conditions taht usually appear in assembling process: 1. There is no dependency of the components in the works 2. If a component has been selected to be assembled, then the sequence begins to assemble other components. Precedence diagram  Precedence diagram: a diagram that describes the ordering in which work elements should be performed. It shows that some jobs cannot be performed unless their predecessors are completed. The layout of workstations along the assembly line depends on the precedence diagram  Presedence diagram symbols:  Symbol element  Relationship between symbols Precedence Diagram Zoning Constraint  Allocation of work elements at the work station is also limited by zoning constraints that preclude or require grouping of certain elements of the work on a particular station. Line Balancing Methods  Helgeson dan Birnie / Ranked Positional Weight (RPW)  Kilbridge and Wester Heuristic (Region Approach)  Largest Candidate Rule . ASSEMBLY LINE BALANCING MODUL 7 What is Line Balancing ??  Assigning each task to a work within an assembly line in order to meet the required production. achieve a minimum amount of idle time.  Line balancing is the procedure in which tasks along the assembly line are assigned to work station so each line has approximately same amount of work. Terms. the total work content in an assembly process. Terms Defined (Cont.)  Smoothness index (SI): an index to indicate the relative smoothness of a given assembly line balance. A smoothness index