Line balancing ppt By Wakil Kumar
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The document summarizes key concepts related to line balancing problems in manufacturing. It defines terms like minimum work element, total work content, workstation process time, cycle time, and precedence constraints that are important to consider when balancing a production line. It also describes the largest candidate rule method for assigning work elements to stations in a way that aims to balance station times and meet production rate requirements while respecting precedence constraints.
Line balancing ppt By Wakil Kumar
- 1. Career Point Cares CAREER POINT UNIVERSITY MAJOR ASSIGNMENT TOPIC: Line Balancing Submitted By :- Mr. Wakil Kumar UID : K12467 Course: B.Tech, 1st year/ 2nd sem Branch: CSE Submitted To :- Prof. Amardeep Kumar Subject : Manufacturing (MEL120)
- 2. Career Point Cares Contents • The Line Balancing Problem • Things to consider • Terminology and Definitions • Minimum Work Element • Total Work Content • Workstation Process time • Cycle time • Precedence Constraints • Balance Delay • Method – Largest Candidate Rule
- 3. Career Point Cares 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
- 4. Career Point Cares 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
- 5. Career Point Cares 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: • is a constant ejT ejT
- 6. Career Point Cares Total Work Content • Aggregate of work elements ∑= = n j ejwc TT 1
- 7. Career Point Cares 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
- 8. Career Point Cares 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
- 9. Career Point Cares 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
- 10. Career Point Cares Balance Delay • Measure of line inefficiency due to imbalances in station times c wcc nT TnT d − =
- 11. Career Point Cares 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
- 12. Career Point Cares THANK YOU…