文档介绍：Just-in-Time and Lean Systems
Operations Management
petitive Advantage
CHASE AQUILANO JACOBS
ninth edition
Chapter 10
Chapter 10 Just-in-Time and Lean Systems
JIT Defined
The Japanese Approach to Productivity
JIT Implementation Requirements
JIT in Services
Just-In-Time (JIT) Defined
JIT can be defined as an integrated set of activities designed to achieve high-volume production using minimal inventories (raw materials, work in process, and finished goods).
JIT also involves the elimination of waste in production effort.
JIT also involves the timing of production resources (., parts arrive at the next workstation “just in time”).
JIT Demand-Pull Logic
Exhibit
Customers
Sub
Sub
Fab
Fab
Fab
Fab
Vendor
Vendor
Vendor
Vendor
Final
Assembly
The Japanese Approach to Productivity
Imported technologies
Efforts concentrated on shop floor
Quality improvement focus
Elimination of waste
Respect for people
Waste in Operations
(1) Waste from overproduction
(2) Waste of waiting time
(3) Transportation waste
(4) Inventory waste
(5) Processing waste
(6) Waste of motion
(7) Waste from product defects
Minimizing Waste: Focused works
Final Assembly
Coordination
System Integration
Minimizing Waste: Group Technology (Part 1)
Using Departmental Specialization for plant layout can cause a lot of unnecessary material movement.
Saw
Saw
Lathe
Press
Press
Grinder
Lathe
Lathe
Saw
Press
Heat Treat
Grinder
Minimizing Waste: Group Technology (Part 2)
Revising by using Group Technology Cells can reduce movement and improve product flow.
Press
Lathe
Grinder
Grinder
A
2
B
Saw
Heat Treat
Lathe
Saw
Lathe
Press
Lathe
1
Minimizing Waste: Uniform Plant Loading
Not uniform Jan. Units Feb. Units Mar. Units Total
1,200 3,500 4,300 9,000
Uniform Jan. Units Feb. Units Mar. Units Total
3,000 3,000 3,000 9,000
Suppose we operate a production plant that produces a single product. The schedule of production for this product could be p