2.810 Jose J. Pachecoweb.mit.edu/2.810/www/files/lectures/lec14c-pacheco-tps-2019.pdf · Layout of...
Transcript of 2.810 Jose J. Pachecoweb.mit.edu/2.810/www/files/lectures/lec14c-pacheco-tps-2019.pdf · Layout of...
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2.810
• The Toyota Production System & Implementation in a highly automated (4.0) Assembly / Manufacturing Plant
• Jose J. Pacheco
23 October 2019
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Today in 2.810
A bit of history
Principles
Design Rules
Real World Examples
Application in Mercedes-Benz Truck Plant in Brazil
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History
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HistoryFuture
2010
Digitization, Automation“4.0” , Smart Mfgr
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How we got here
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1980’s OPEC oil
embargo drives
up fuel prices,
Japan
imports small
cars with increased
fuel mileage
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Consumer Reports
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How we learned about TPS
• Quality of cars - but not right away
• Pilgrimages - Hayes, Wheelwright, Clark
• Joint ventures - Nummi-Geo…
• Japanese NA operations-Georgetown, KY
• Japanese sages- Ohno, Shingo, Monden
• American translation- “Lean”, J T. Black..
• Consulting firms-…Shingjutsu,…
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Toyota Production System Development History - Taiichi Ohno
30 years of development 1945 to 1975
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TPS as a subset in history of manufacturing
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REFERENCES ON THE TOYOTA
PRODUCTION SYSTEM;
Taiichi Ohno, “The Toyota Production
System” Productivity Press 1988
Shigeo Shingo, “A Study of the Toyota
Production System” Productivity Press
1989
Yasuhiro Monden, “Toyota Production
System”, 2nd Ed 1983
Hayes, Wheelwright and Clark,
“Dynamic Manufacturing” Free Press1988
Womack and Jones, “Lean Thinking”
Simon and Schuster, 1996
Spear & Bowen, “The DNA of the TPS’
HBR 19991990
JT Black, “Design Rules for
Implementing the Toyota
Production System” IJPR
2007
E. Lander & J. K. Liker (2007)
The Toyota Production System
and art: making highly customized
and creative products theToyota way” IJPR 2007
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Performance Observations
• Early observations of reliability, after some initial start-up problems
• IMVP got actual factory level data 1980’s• defect counts
• direct labor hours for assembly
• level of automation
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Summary of Assembly Plant Characteristics, Volume Producers, 1989 (Average for Plants in Each Region)
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Cost Vs DefectsRef. “Machine that Changed the World” Womack, Jones and Roos
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Cost Vs AutomationRef. “Machine that Changed the World” Womack, Jones and Roos
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More than tools
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Fundamental Differences in Manufacturing Technology + Mental Model
• Mental model is what a person believes about the system at hand.
• Note• A mental model is based on belief, not facts: • Individual users each have their own mental model.
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An example
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Design Rules
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History of the Development of the Toyota Production System ref; Taiichi Ohno
1945 1975inventory
set-up
cells
Andon
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JT Black’s Design Rules1: Final assembly (FA) line which has a takt time (TT) that is based on the daily demand for the goods being made in the factory.
2. All the goods producing aspects of the system operate on a MO-CO-MOO basis, like final assembly.
3. The subassembly manufacturing factories must be redesigned into parallel lines or U-shaped assembly cells to achieve one-piece flow
4. The manufacturing components are connected to final assembly with Kanban links, a pull system which withdraw material from the subassembly and component suppliers cells as needed by final assembly and give production orders to all the suppliers automatically.
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Evolution of Principles
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25Ref Yasuhiro Monden
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A more recent view
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JT Black’s Implementation
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JT Black’s Implementation (Cont)
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JT Black’s Implementation (Cont)
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J T. Black’s 10 StepsRef; JT. Black “Factory with a Future” 1991
1. Form cells
2. Reduce setup
3. Integrate quality control
4. Integrate preventive maintenance
5. Level and balance
6. Link cells – KANBAN
7. Reduce WIP
8. Build vendor programs
9. Automate
10. Computerize
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J T. Black –1, 2
1. Form Cells
Sequential operations, decouple operator from machine, parts in families, single piece flow within cell
2. Reduce Setup
Externalize setup to reduce down-time during changeover, standardize set-up
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TPS Cell
To
yota
Cell,
on
e p
art
is p
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uced
for
eve
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rip
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he c
ell
J T. Black
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J T. Black – 3, 4
3. Integrate quality control
Check part quality at cell, poke-yoke, stop production when parts are bad, make problems visible, Andon - info about work being done…
4. Integrate preventive maintenance
worker maintains machine , runs slower, operator owns production of part
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J T. Black – 5, 6
5. Level and balance
Produce to Takt time, reduce batch sizes, smooth production flow, produce in mix to match demand
6. Link cells- Kanban
Create “pull” system –“Supermarket” System that indicates the status of the system
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Balancing and Leveling
• Balanced line: adjust process time for smooth flow “Takt time”
• Leveled Line: each product is produced in the needed distribution.
A A B C A
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Pull System at the Supermarket
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Four Rules…
• Rule 1: All work shall be highly specified as to content, sequence, timing and outcome.
• Rule 2: Every customer-supplier connection must be direct, and there must be an unambiguous yes-or-no way to send requests and receive responses.
• Rule 3: The pathway for every product and service must be simple and direct.
• Rule 4: Any improvement must be made in accordance with the scientific method, under the guidance of a teacher, at the lowest possible level in the organization.
Spear and Bowen
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Real World Examples
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A cell - Machining valves
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Mercedes Benz - Sao Bernardo do Campo 2019
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Mercedes Benz - Sao Bernardo do Campo 2019
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Layout of Mercedes Benz Truck Plant4th design rule: The manufacturing components are connected to final assembly with Kanban links which withdraw material from the subassembly and component suppliers cells as needed by final assembly and give production orders to all the suppliers automatically.
Cabins
Engines
Transmissions
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Design Rules• 4th design rule: The manufacturing components are connected to
final assembly with Kanban links which withdraw material from the subassembly and component suppliers cells as needed by final assembly and give production orders to all the suppliers automatically.
https://images.app.goo.gl/8cAXadxZkRuUCD1W8
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Design Rules
• The 2nd design rule is that all the goods producing aspects of the system operate on a MO-CO-MOO basis, like final assembly. One-piece flow or single-piece flow).
https://images.app.goo.gl/kfqHXoTYoLMM8YgA9
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Design Rules
• The final assembly (FA) line which has a takt time (TT) that is based on the daily demand for the goods being made in the factory.
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A cell?
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Design Rules
• The 2nd design rule is that all the goods producing aspects of the system operate on a MO-CO-MOO basis, like final assembly. One-piece flow or single-piece flow).
https://www.youtube.com/watch?v=zhqYqKiwTVQ
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Numerical Problem
Example Operations
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Cabins
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Cabins - Cont
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Final Assembly - Start
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Moving Assembly line – Moving Workers –Moving Information
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Kanban
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Kanban (Cont)
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Information Flows
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Ergonomics
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2.810
• The Toyota Production System & Implementation in a highly automated (4.0) Assembly / Manufacturing Plant
• Jose J. Pacheco
23 October 2019
Questions?