Line balancing

Line Balancing

Introduction-

Line and work cell balancing is an effective tool to improve the throughput of assembly lines and work cells while reducing manpower requirements and costs. Assembly Line Balancing or simply Line Balancing (LB) is the problem of assigning operations to workstations along an assembly line, in such a way that the assignment be optimal in some sense. LB has been an optimization problem of significant industrial importance: the efficiency difference between an optimal and a sub-optimal assignment can yield economies (or waste) reaching millions of dollars per year.

LB is a classic Operations Research (OR) optimization problem, having been tackled by OR over several decades. Many algorithms have been proposed for the problem. Yet despite the practical importance of the problem, and the OR efforts that have been made to tackle it, little commercially available software is available to help industry in optimizing their lines.

Line Balancing is leveling the workload across all processes in a cell or value stream to remove bottlenecks and excess capacity. A constraint slows the process down and results if waiting for downstream operations and excess capacity results in waiting and absorption of fixed costs.

LINE BALANCING (Process Organization)-

The Line Balancing is “to design a smooth production flow by allotting processes to workers so as to allow each worker to complete the allotted workload within an even time” It is a system where we meet the production expectations and we can find the same amount of work in process in every operation at any point in the day

How do we start balancing the production line?

Well we can start by determining how many operators for each operation are needed for a determined level of production. After this we need to determine how much WIP we need to anticipate production problems. Recommended WIP is 1-

hour inventory level for each operation. A good range would be from 30 min to 120 min inventory level.

Line Balancing in apparel industry-

It is the allocation of sewing machine, according to style and design of the garments. It depends on what types of garments we have to produce. It is done to increasing productivity.

When you consider mass production, garments are produced in lines or set of machines instead of single machine. A line may be assembly line, modular line or section, a line set with online finishing and packing. A line includes multiple work stations with varied work contents. Production per hour is varied depending on work content (standard minutes of particular task/operation), allocation of total manpower to a particular operation, operator skill level and machine capacity. Operation with lowest production per hour is called as bottleneck operation for that line.

Objectives of Line Balancing

Match the production rate after all wastes have been removed to the talk time at each process of the value stream.

1. Regular material flow.2. Maximum uses of man power and machine capacity.3. Minimum process time.4. Minimizing slack time.5. Minimizing workstation.

Maximum output at the desired time.

1. Quality maintenance of the garment.

2. Reduce production cost.3. Importance of Line Balancing4. Line balancing helps to know about new machine required for new style.5. It becomes easier to distribute particular job to each operator.6. It becomes possible to deliver goods at right time at the agreed quality for

list cost.7. Good line balancing increase the rate of production.8. Line balancing helps to compare the required machinery with the existing

one and compare balance.9. It also helps in the determination of labor requirement.10.Good balancing reduces production time.11.Profit of a factory can be ensured by proper line balancing.12.Proper line balancing ensured optimum production at the agreed quality.13.It reduces faults in the finished product.

Example of Line Balancing

1. Machine layout with actual production.

>Process#1. Production 40 pieces by 1 machine end production 40 pieces.





Output: 40pices/hour.

Analysis: Insufficient production due to lack of supply.

2. Machine layout for balancing production.

Analysis: Action plan for further development.

Replace skilled or experienced operator for process#3, then production will increase, when production will be 80pices/hour. Then same target 90pices for process1, 3 & 4 and research on it, how production can be increased. The following action can be done.

Limitations of Line Balancing

Production lines were designed so that conveyor belts paced the speed of the employees‟ work. This arrangement wasn't appreciated by the employees.

Inevitable changes lead to production lines being out of balance.

Rebalancing causes disruptions to production

Ankur shukla

Apparel Production Management (2-sem)

Production Technology

Resource- Read more: http://textilelearner.blogspot.com/2013/09/line-balancing-in-apparel-production.html#ixzz3ZqNMnEav.

Education

Line balancing