(microsoft powerpoint - tpm oee [kompatibilitetsl\344ge])
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OEE, TPM RCMOEE, TPM and RCM
KPP202Antti Salonen
Productive time Unproductive time
How a production shift may look!
Planned production time
Start-up problem
Set-up
Break-downs
Planned stopps
Cleaning
Period with small-stops
Period with reduced speed
Production
Purpose:
• Show the disturbances that reduces the productivity of the
OEEOverall Equipment Effectiveness
• Show the disturbances that reduces the productivity of the equipment
• Show how effective the equipment is used by measuring loss factors
• Show that improving actions are adequate.
• Aid in planning of resources and workload
The six big losses
• Failures and break-downs
• Set-up and adjustments
• Idling and minor stoppages
• Reduced speed
• Defects and rework
• Start-up losses
X X
What is OEE?
Quality ratePerformance rateAvailability
X X
The OEE-value indicatesthe total effectiveness in production
Availability =
Planned prod. time – Unplanned stop time
Planned prod. time
Scheduled working time
Planned production time
Available operative time
Planning related stopps
Un
pla
nn
ed
sto
pp
s
Set-up and adjustments
Failures and breakdowns
OEE calculationsPlanning factor =
Scheduled time – Planning related stop time
Scheduled time
Value adding
operative time
Overall Equipment Effectiveness (OEE)
= Availability x Performance rate x Quality rate
Performance rate =
Bought CT x items produced
Available operative time
Quality rate =
Items produced - Defects
Items produced
Netoperative
time
Def
ects
Un
pla
nn
ed
Sp
eed
lo
ss
Idling andminor stoppage
Reduced speed
Defects andrework
Start-up losses
adjustments
= (Planning factor) x
Availability = Planned production time – unplanned stop time 400 min - 90 min
Planned production time400 min
= 0,775=
OEE calculations
Scheduled working time – planning related stop time
Scheduled working timePlanning factor =
480 min - 80 min
480 min
= 0,83=
Quality rate = Items produced – defect items 500 pieces - 20 pieces
Items produced 500 st= 0,96=
Planned production time400 min
Performance rate = Bought cycle time x items produced 0,6 min/piece x 412 pieces
Available operative time 310 min
= 0,797=
PfOEE = 0,83 x 0,775 x 0,797 x 0,96 x 100 (%) = 49,2%
OEE = 0,775 x 0,797 x 0,96 x 100 (%) = 59,3%
Three levels of measurement
How to measure ?
Depending on purpose and aim with the measuring, the following three levels may be used:
Level 1 Total utilization = Pftot x A x P x QLevel 1 Total utilization = Pftot x A x P x Q
This level indicates how a plant is utilized compared to maximum available time (24hrs/day, 365 days/year)
Level 2 Asset effectiveness = Pf x A x P x Q
This level indicates how effective an asset is used regarding planned working hours
Level 3 Equipment effectiveness = A x P x Q
This level indicates how effective a specific equipment is used.
Calculation of Pftot
Theoretical available time (24h/day, 365 days/year) – planning related stop timeTheoretical available time (24h/day, 365 days/year)
OEE: Total planning factor
Theoretical available time (24h/day, 365 days/year)
Planning related stop time is time loss that doesn’t affect the equipment effectiveness.
For example hollidays, breaks, meeting time, education, cleaning, waiting time due to surrounding equipment, PM, planned modifications, lack of orders, personell or material.
Note. The use of 24h/day, 365 days/year for definition of Theoretical available time is common within process industries where heavy investments occur.
Calculation of Pf
Theoretical production time (scheduled) – planning related stop time
Theoretical production time (scheduled)
OEE: Planning factor
Theoretical production time (scheduled)
Theoretical production time is the scheduled production time when the facility is manned.
E.g. 3-shift (ca 110 hours/week), daytime (40 hours/week)
Planning related stop time is time loss that doesn’t affect the equipment effectiveness.
For example hollidays, breaks, meeting time, education, cleaning, waiting time due to surrounding equipment, PM, planned modifications, lack of orders, personell or material.
Availability = Planned production time – unplanned stop time
Planned production time
OEE calculations
Theoretical production time – planning related stop time
Theoretical production timePlanning factor =
Quality rate = Items produced – defect items
Items produced
Planned production time
Performance rate = Bought cycle time x items produced
Available operative time
PfOEE = Pf x A x P x Q x 100 = %
OEE = A x P x Q x 100 = %
OEE: CalculationScheduled working time 4x16h + 14h = 78h
Planning related stops 2x5x0,5h + 1h + 5x0,2h = 7h
Planning factor (Pf) (78-7h) / 78 = 0,910 Pf = 91,0%
Planned production time 78h-7h = 71h
Unplanned stop time 1,5h + 3,2h + 1,9h = 6,6h
Availability (A) (71 – 6,6) / 71 = 0,907 A = 90,7%Availability (A) (71 – 6,6) / 71 = 0,907 A = 90,7%
Available operative time 71h – 6,6h = 64,4h
Bought cycle time 6 min / 60 = 0,1h
Produced items 523 st
Performance rate (P) (0,1x523) / 64,4 = 0,812 P = 81,2%
Scrap 3 st.
Quality rate (Q) (523 – 3) / 523 0,994 Q = 99,4%
PfOEE 0,910x0,907x0,812x0,994 0,666 PfOEE = 66,6%
OEE 0,907x0,812x0,994 0,732 OEE = 73,2%
The following has to be explored:
� Manual loading time included?
Limiting factors affecting the cycle time?
Defining Cycle time
� Limiting factors affecting the cycle time?
� Can several products be produced during one cycle?
� Do different products have different cycle times?
Defining bought cycle time
� Cycle time according to equipment specification
� Cycle time according to product specification
� Lowest CT in similar equipment
� Lowest CT tested in the equipment
� Theoretically calculated CT
� Lowest measured CT
� Actual CT recalculated with ambition
Performance rate, P- when producing products with different CT’s
ProductTheoretical CT, CTT (min/piece) 0,6 0,7 0,8 0,9
P1 P2 P3 P4
Produced amount, P (piece)
CTT x P (min)
Sum CTT x P (min)
Available operative time*, T.O.T (min)
P = (Sum CTT x P) /T.O.T (%)
0,6 0,7 0,8 0,9
100 150 50 50
60 105 40 45
250
300
83%
* Planned production time – Unplanned stops
Increased OEE leads to….
� Less disturbances which in turn may lead to
� Improved planning ability
� Reduced risk of quality problems� Reduced risk of quality problems
� More time for developing work
� Released capacity which in turn may lead to
� Alternative to capacity investments
� Increased flexibility
� Decreased operative time
� Decreased number of equipments
Time for a break?
OEE in Swedish industry (2002)
40
50
% OEE Interval60%
Average
80%
88%
Improvement potential
10
20
30
40
35-45 45-55 55-65 65-75 75-85 85-95 %
OEE
Electronics Power
Chemical
P & P
SteelMining
Manufacturing industry
80%
Practically achievable
Average OEE = 60,4%
Utilization
Results from a study of 30 Swedish sub suppliers in
automotive industry (Nutek, 2008)
For comparison, a number of similar companies in other
countries were studied:
Average OEE in other countries = 77%
This means that forreign companies have 27,5%
higher productivity in their production equipment!
Average OEE = 60,4%
Utilization
More findings from the study of 30 Swedish sub-suppliers
in automotive industry (Nutek, 2008)
39% of the companies measure and analyze time-loss and cause of failures
86% of the companies perform systematic preventive maintenance
14% of the companies measure and analyze time-loss and cause of disturbances
25% of the companies perform CBM
My own observations
Poor utilization of the possibilities of analyzing data from CMMS
Most companies fail to regard dependability aspects when investing
Few companies use systematic RCA (Root Cause Analysis)Few companies use systematic RCA (Root Cause Analysis)
Few companies use systematic maintenance concepts
Few companies measure the cost of lost production
TPM – what’s that?
• Total Productive Maintenance
• Total Process Management
• Total Production Management
• And so on….
TPM - definition
• TPM can be defined as a systematic work • TPM can be defined as a systematic work method aiming to develop disturbance free processes at lowest possible costthrough the commitment of all co-workers(LCP-Consultants)
TPM as a philosophy
– Focuses on daily maintenance in manufacturing industries, it is built on total employee involvement, born in the Japanese automobile industry.
TPM – Total Productive Maintenance
• Total Effectiveness
• Total Preventive Maintenance
• Total Commitment
Why TPM?
• Replace routine with development
• Increased commitment from all co-workers
• Continuous improvements
• Foreseeable operations
• Improved safety and environment
TPM Structure
Ear
ly e
quip
men
t m
anag
emen
t
Saf
ety,
hy
gie
ne
and e
nvir
onm
ent
Evaluation and new goals
Preparation Implementation
Effectiveness
Continuous improvements
Autonomous maintenance
Planned maintenance
Ear
ly e
quip
men
t m
anag
emen
t
Qual
ity
mai
nte
nan
ce
Eff
ecti
ve
adm
inis
trat
ion
Saf
ety,
hy
gie
ne
and e
nvir
onm
ent
Education
Organisation and pilot
Policy and goals
Develop a master plan
Management’s decision
Education and training
Kick
-off
Group activities
Cross functional improvement group
Autonomous maintenance group
Target oriented cross functional group
Quality improvement tools
Identify, prioritize and analyze failures7QC/QM
FTA
Identify and evaluate potential weaknesses
Identify causes of failures and their logic connections
Reduce all chronic loss to zeroPM-analysis
FMEA
Autonomous maintenance
Autonomous maintenance• Teach the operators to react on cause instead of result
• By increased kompetence and understanding the operators may:– Eliminate minor stoppages
– Prevent break-downs– Prevent break-downs
– Secure implemented improvements
– Improve quality, safety, and environment
• In the long run operators start to perform maintenance tasks
• Daliy inspections replaces repair and low frequent controls
• Implemented through seven well-defined steps
• Takes long time to implement, often years
Description Competence
Repair skills
The seven-step ladder
1. Basic cleaning and order
2. Counter meassures at the problem source
3. Standards for cleaning and lubrication
4. General inspection training
5. Autonomous inspection
6. Organize the work environment
7. Autonomous maintenance
Equipment
focusing step.
Secures the basic
condition of the
equipment
Focuses the operators.
They learn advanced
inspection and
maintenance techniques
Factory focusing step.
From maintenance to
control.
Repair skills
Understands the
relation between
maintenance and
product quality
Understands the
functions and structure
of the machines
Can find defects and
understand the principles for
improvements of the
equipment
Planned maintenance
Maintenance planning
Maintenance control
Inform
ation feed
back
Activities for improved
maintenance effectiveness
Corrective Maintenance
Preventive Maintenance
Restoring M
aintenance
Improvem
ent Maintenance
Condition Based M
aintenance
Activities for improved OEE
Spare part control
Economy control
Implementation of planned maintenance leads to:-Increased MTBF and MTBM-Decreased MTTR, MWT and M-Closer to 0-faults, 0-stops and 0-accidents
Inform
ation feed
back
Activities for improved
maintenance effectiveness
Corrective Maintenance
Preventive Maintenance
Restoring M
aintenance
Improvem
ent Maintenance
Condition Based M
aintenance
Early equipment management
LCCBasic properties
Acquisition process
Project
Goal and requirements
The process has to goals:•To reach stable, full speed production at start-up.•To, as far as possible, meet the detailed
Early detection of problems
Experience developmentMP-design
Project Structure and process thinking
The included activities are aiming for new equipment to be:•Reliable and producing non defective products.•Easy to mend and set up, and fast to start after set-up changes.•Easy to maintain, and fast to localize faults and repair.•Easy to clean, lubricate and inspect.•Resource efficient and safe.
•To, as far as possible, meet the detailed requirements for the equipment.
Quality maintenance
Results of TPM at VolvoProductivity Breakdowns reduced with 90%
OEE increased from 50% to 90%
MTBF increased from 30 minutes to 8 hours
Quality Scrap reduced with 90%
Cost of quality control reduced with 67%Cost of quality control reduced with 67%
Customer complaints reduced with 75%
Costs Production cost reduced with 30%
Delivery precision Capital bound in WIP and finished goods decreased with 50%
Fulfillment actual/desired delivery time increased to 90%
Delivery precision actual/promised time increased to 100%
Safety Accidents resulting in personal injuries reduced to 0
Accidents resulting in pollution reduced to 0
Commitment Ten times as many suggested improvements
Time for education and training increased with 100%
RCM has been defined as…
Reliability Centered Maintenance: a process used
RCM – what’s that?
Reliability Centered Maintenance: a process used to determine what must be done to ensure that any physical asset continues to do what its users want it to do in its present operating context.
RCM
• Reliability Centered Maintenance, RCM
– Focuses on construction and development of products and manufacturing systems maintainability and to develop an effective and maintainability and to develop an effective and resource parsimoniuos PM before the product or system is up and running, born in the aircraft industry
Reliability Centred Maintenance, RCM
• RCM is sprung from MSG (Maintenance Steering Group) that has been developed since the 1960s’, for Group) that has been developed since the 1960s’, for the purpose of the aircraft industry.
• RCM have since also been developed to be used in e.g. the power industry, energy industry, and in some cases also the manufacturing industry.
Reliability Centred Maintenance, RCM
• With RCM methodology one handle the maintenance objectives as early as in the development phase on a objectives as early as in the development phase on a consciously, rationally, and planned base.
• One analyses potential failure that can occur on the developed systems, structures, or components.
• Faults can be classified as obvious or hidden, safety critical or of considerable financial character.
RCM is basically about answering…
• …what are the functions and associated performance standards of the asset in its present operating context?
RCM
standards of the asset in its present operating context?
• …in what ways does it fail to fulfill its functions?
• …what causes each functional failure?
• …what happens when each failure occurs?
• …in what way does each failure matter?
• …what can be done to predict or prevent each failure?
• …what should be done if a suitable proactive task cannot be found?
• This can be performed through e.g. FMEA and FTA
Further reading
Total Productive Maintenance (TPM) Concepts and Literature Review, (Pomorski, 2004)Literature Review, (Pomorski, 2004)
Reliability centered maintenance, (Rausand, 1998)
A review of overall models for maintenance management, (Sherwin, 2000)