15-06-2012, 11:44 AM
Seminar on Just-In-Time Systems
Just-In-Time.ppt (Size: 330.5 KB / Downloads: 74)
JIT/Lean Production
Just-in-time: Repetitive production system in which processing and movement of materials and goods occur just as they are needed, usually in small batches
JIT is characteristic of lean production systems
JIT operates with very little “fat”.
Sources of Waste
Overproduction
Waiting time
Unnecessary transportation
Processing waste
Inefficient work methods
Product defects
Process Design
Small lot sizes
Setup time reduction
Manufacturing cells
Limited work in process
Quality improvement
Production flexibility
Little inventory storage
Production Flexibility
Reduce downtime by reducing changeover time
Use preventive maintenance to reduce breakdowns
Cross-train workers to help clear bottlenecks
Reserve capacity for important customers.
Manufacturing Planning and Control
Level loading
Pull systems
Visual systems
Close vendor relationships
Reduced transaction processing
Preventive maintenance
Kanban Production Control System
Kanban: Card or other device that communicates demand for work or materials from the preceding station
Kanban is the Japanese word meaning “signal” or “visible record”
Paperless production control system
Authority to pull, or produce comes from a downstream process.
Converting to a JIT System
Get top management commitment
Decide which parts need most effort
Obtain support of workers
Start by trying to reduce setup times
Gradually convert operations
Convert suppliers to JIT
Prepare for obstacles
Elements of JIT
Smooth flow of work (the ultimate goal)
Elimination of waste
Continuous improvement
Eliminating anything that does not add value
Simple systems that are easy to manage
Use of product layouts to minimize moving materials and parts
Quality at the source