Upload
vvmech
View
89
Download
0
Tags:
Embed Size (px)
DESCRIPTION
basics of VSM...
Citation preview
Value Stream Mapping
1
Value Stream Mapping
• A tool originally used by the Toyota Production System experts to study processes
• Developed and refined by John Shook and Mike Rother
• Used in manufacturing, engineering and administrative offices by lean experts to improve business processes
Value Stream Mapping Definition
– Special type of flow chart that uses symbols known as "the language of Lean" to depict and improve the flow of inventory and information.
3
What is a Value Stream?
A value stream involves all the steps, both value added and non value added, required to complete a product or service
from beginning to end
5
Value Stream Improvement & Process Improvement
Value Stream
Improvement
PROCESS PROCESS PROCESS
Outgoing Finished Product
Incoming Raw Materials
Customer
6
PURPOSE :
Understand the role value stream mapping plays in continuous improvement
Draw a current-state map
Draw a future-state map
Develop an implementation plan
Getting Started
Using the Value Stream Mapping Tool
Understanding how things
currently operate. This is
the foundation for the
future state.
Scoping the
Value Stream
Designing a lean flow through
the enterprise.
Future state
drawing
Determine the Value
Stream to be improved
The goal of mapping! Planning and
Implementation
Current state
drawing
Advantage of Value Stream Mapping & Analysis
• Develop a common understanding of the current process– The relationship of process steps
– A true picture of the process
• Create a baseline to measure improvements against
• Define a vision of the future process
• Establish common leadership objectives
• Identify opportunities for improvement
• Design an implementation plan for improvements
“If you can’t describe what you are doing as a process, you don’t know what you’re doing.” W. Edwards Deming
8
Planning tool to optimize results of eliminating waste
Analyzing the Value Stream
+ + =Lean
Basics
current state VSM future state VSM
9
A SIMPLE EXAMPLE…………..
Pick Up Paper Walk to Stapler Staple Paper
Walk to Desk Put Down Paper
Time: 1 sec.Distance: 0
Time: 5 sec.Distance: 20 ft.
Time: 5 sec.Distance: 20 ft.
Time: 2 sec.Distance: 0
Time: 1 sec.Distance: 0
Total Time: 14 sec.Total Dist: 40 ft.Value Added Time: 4 sec.Value Added Dist: 0
Value Added Time: 28%
Info: Where to place stapleInfo: Location of stapler
Excess Travel
10
11
The Current State Map
12
Sample VSM Map
13
Value Stream Mapping Symbols
VSM Symbols
14
Current State Drawing
Current State
Product Family
Current State Drawing
Future State Drawing
Plan and Implementation
Determining how production currently operates.
Material and Information flows
Draw using VSM icons
Start with the “door to door” flow
Walk the production lines and get actualsNo standard timesDraw by hand, with pencil
Foundation for the Future Site
15
TAKT Time
TAKT Time
Match assembly pace to pace of orders.
Rate for assembling based on orders rate.
Work Time per ShiftTAKT Time =
Customer Requirement per Shift
27,600 sec
460 pieces= 60 seconds
16
Future State Value Stream
17
Future State Drawing
Future State
Product Family
Current State Drawing
Future State Drawing
Plan and Implementation
Designing a LEAN Flow
The power behind Value Stream Mapping is you always need a future state!
Keep Updating. Use pencil!
Material and Information flows
Basis for your Work Plan – like a “blueprint”
Begin by drawing on Current State
1st iteration assumes existing steps & equipment
Can move equipment, combine, take outconveyors, make minor purchases etc.
But, there is a Problem!
18
Future State Map
Future State
19