Introduction to Total Productive Maintenance
-TPM-
·
What is TPM ?
Total productive maintenance (TPM) is a
system of maintaining and improving the integrity of production and quality
systems through the machines, equipment, processes, and employees that add
business value to the organization.
TPM focuses on
keeping all equipment in top working condition to avoid breakdowns and delays
in the manufacturing process. Total Productive Maintenance (TPM) is a
maintenance program which involves a newly defined concept for maintaining
plants and equipment. The goal of the TPM program is to markedly increase
production while, at the same time, increasing employee morale and job
satisfaction.
TPM brings maintenance into focus as a
necessary and vitally important part of the business. It is no longer regarded
as a non-profit activity. Down time for maintenance is scheduled as a part of
the manufacturing day and, in some cases, as an integral part of the
manufacturing process. The goal is to hold emergency and unscheduled maintenance
to a minimum.
·
Why TPM ?
Total productive maintenance (TPM) is a system of maintaining and improving the integrity of production and quality systems through the machines, equipment, processes, and employees that add business value to the organization.
TPM focuses on
keeping all equipment in top working condition to avoid breakdowns and delays
in the manufacturing process. Total Productive Maintenance (TPM) is a
maintenance program which involves a newly defined concept for maintaining
plants and equipment. The goal of the TPM program is to markedly increase
production while, at the same time, increasing employee morale and job
satisfaction.
TPM brings maintenance into focus as a necessary and vitally important part of the business. It is no longer regarded as a non-profit activity. Down time for maintenance is scheduled as a part of the manufacturing day and, in some cases, as an integral part of the manufacturing process. The goal is to hold emergency and unscheduled maintenance to a minimum.
· Why TPM ?
TPM was introduced to achieve the following objectives. The
important ones are listed below.
Avoid wastage in a quickly changing economic environment.
Producing goods without reducing product quality.
Reduce cost.
Produce a low batch quantity at the earliest possible time.
Goods send to the customers must be non defective.
· Similarities and differences between TQM and TPM :
The TPM program closely resembles the popular Total Quality Management (TQM) program. Many of the tools such as employee empowerment, bench marking, documentation, etc. used in TQM are used to implement and optimize TPM.
Following are the similarities between the two.
Total commitment to the program by upper level management is required in both.Employees must be empowered to initiate corrective action, and a long range outlook must be accepted as TPM may take a year or more to implement and is an on-going process. Changes in employee mind-set toward their job responsibilities must take place as well.
The differences between TQM and TPM are
summarized below.
Category
|
TQM
|
TPM
|
Object
|
Quality (
Output and effects )
|
Equipment
( Input and
cause)
|
Means of
attaining goal
|
Systematize
the management. It is software oriented
|
Employees
participation and it is hardware oriented
|
Target
|
Quality for PPM
|
Elimination
of losses and wastes.
|
Types of maintenance:
1. Breakdown maintenance :
It means that people waits until equipment fails and repair
it. Such a thing could be used when the equipment failure does not
significantly affect the operation or production or generate any significant
loss other than repair cost.
2. Preventive maintenance ( 1951 ):
It is a daily maintenance ( cleaning, inspection, oiling
and re-tightening ), design to retain the healthy condition of equipment and
prevent failure through the prevention of deterioration, periodic inspection or
equipment condition diagnosis, to measure deterioration. It is further divided
into periodic maintenance and predictive maintenance. Just like human life is
extended by preventive medicine, the equipment service life can be prolonged by
doing preventive maintenance.
2.1. Periodic maintenance ( Time based maintenance - TBM) :
Time based maintenance consists of periodically inspecting,
servicing and cleaning equipment and replacing parts to prevent sudden failure
and process problems.
2.2. Predictive maintenance :
This is a method in which the service life of important
part is predicted based on inspection or diagnosis, in order to use the parts
to the limit of their service life. Compared to periodic maintenance,
predictive maintenance is condition based maintenance. It manages trend values,
by measuring and analyzing data about deterioration and employs a surveillance
system, designed to monitor conditions through an on-line system.
3. Corrective maintenance ( 1957 ) :
It improves equipment and its components so that preventive
maintenance can be carried out reliably. Equipment with design weakness must be
redesigned to improve reliability or improving maintainability
4. Maintenance prevention ( 1960 ):
It indicates the design of a new equipment. Weakness of
current machines are sufficiently studied ( on site information leading to
failure prevention, easier maintenance and prevents of defects, safety and ease
of manufacturing ) and are incorporated before commissioning a new equipment.
TPM - History:
TPM is a innovative Japanese concept. The origin of TPM can
be traced back to 1951 when preventive maintenance was introduced in Japan . However
the concept of preventive maintenance was taken from USA . Nippondenso was the first
company to introduce plant wide preventive maintenance in 1960. Preventive
maintenance is the concept wherein, operators produced goods using machines and
the maintenance group was dedicated with work of maintaining those machines,
however with the automation of Nippondenso, maintenance became a problem as
more maintenance personnel were required. So the management decided that the
routine maintenance of equipment would be carried out by the operators. (This
is Autonomous maintenance, one of the features of TPM ). Maintenance group took
up only essential maintenance works.
Thus Nippondenso which already followed preventive maintenance also added Autonomous maintenance done by production operators. The maintenance crew went in the equipment modification for improving reliability. The modifications were made or incorporated in new equipment. This lead to maintenance prevention. Thus preventive maintenance along with Maintenance prevention and Maintainability Improvement gave birth to Productive maintenance. The aim of productive maintenance was to maximize plant and equipment effectiveness to achieve optimum life cycle cost of production equipment.
By then Nippon Denso had made quality circles, involving
the employees participation. Thus all employees took part in implementing
Productive maintenance. Based on these developments Nippondenso was awarded the
distinguished plant prize for developing and implementing TPM, by
the Japanese Institute of Plant Engineers ( JIPE ). Thus Nippondenso
of the Toyota
group became the first company to obtain the TPM certification.
TPM Targets:
Production: Obtain
Minimum 80% OPE. Obtain Minimum 90% OEE (Overall Equipment Effectiveness) Run
the machines even during lunch. (Lunch is for operators and not for machines!)
Quality: Operate in
a manner, so that there are no customer complaints.
Cost: Reduce the
manufacturing cost by 30%.
Delivery: Achieve
100% success in delivering the goods as required by the customer.
Safety: Maintain
a accident free environment.
Morale: Increase the
suggestions by 3 times. Develop Multi-skilled and flexible workers.
Motives of TPM
|
Adoption of life cycle approach for
improving the overall performance of production equipment.
Improving productivity by highly motivated
workers which is achieved by job enlargement.
The use of voluntary small group activities
for identifying the cause of failure, possible plant and equipment
modifications.
|
Uniqueness of TPM
|
The major difference between TPM and other
concepts is that the operators are also made to involve in the maintenance
process. The concept of "I ( Production operators ) Operate, You (
Maintenance department ) fix" is not followed.
|
TPM Objectives
|
Achieve Zero Defects, Zero Breakdown and
Zero accidents in all functional areas of the organization.
Involve people in all levels of
organization.
Form different teams to reduce defects and
Self Maintenance.
|
Direct benefits of TPM
|
Increase productivity and OPE ( Overall
Plant Efficiency ) by 1.5 or 2 times.
Rectify customer complaints.
Reduce the manufacturing cost by 30%.
Satisfy the customer’s needs by 100 % (
Delivering the right quantity at the right time, in the required quality. )
Reduce accidents.
Follow pollution control measures.
|
Indirect benefits of TPM
|
Higher confidence level among the
employees.
Keep the work place clean, neat and
attractive.
Favorable change in the attitude of the
operators
Achieve goals by working as team.
Horizontal deployment of a new concept in
all areas of the organization
Share knowledge and experience.
The workers get a feeling of owning the
machine.
|
OEE (Overall Equipment Efficiency )
OEE = A x PE x Q
A - Availability of the machine. Availability is proportion of time machine is actually available out of time it should be available.
A = (MTBF - MTTR) / MTBF.
MTBF - Mean Time between Failures = (Total Running Time) / Number
of Failures.
MTTR - Mean Time To Repair.
PE - Performance Efficiency.
It is given by
RE X SE.
Rate efficiency (RE) : Actual average cycle time is slower than design cycle time
because of jams, etc. Output is reduced because of jams
Speed efficiency (SE) : Actual cycle time is slower than design cycle time machine
output is reduced because it is running at reduced speed.
Q - Refers to quality rate. Which is percentage of
good parts out of total produced sometimes called "yield".
Steps in introduction of TPM in a organization:
A - PREPARATORY STAGE:
STEP 1 - Announcement by Management to all about TPM
introduction in the organization:
Proper understanding, commitment and active involvement of
the top management in needed for this step. Senior management should have
awareness programs, after which announcement is made to all. Publish it in
the house magazine and put it in the notice board. Send a letter to all
concerned individuals if required.
STEP 2 - Initial education and propaganda for TPM :
Training is to be done based on the need. Some need
intensive training and some just an awareness. Take people who matters to
places where TPM already successfully implemented.
STEP 3 - Setting up TPM and departmental
committees :
TPM includes improvement, autonomous maintenance, quality
maintenance etc., as part of it. When committees are set up it should take care
of all those needs.
STEP 4 - Establishing the TPM working system and
target :
Now each area is bench-marked and fix up a target for
achievement.
STEP 5 - A master plan for institutionalizing :
Next step is implementation leading to institutionalizing
wherein TPM becomes an organizational culture. Achieving PM award is the proof
of reaching a satisfactory level.
B - INTRODUCTION STAGE
This is a ceremony and we should invite all. Suppliers as
they should know that we want quality supply from them. Related companies and
affiliated companies who can be our customers, sisters concerns etc. Some may
learn from us and some can help us and customers will get the communication
from us that we care for quality output.
C - IMPLEMENTATION
In this stage eight activities are carried which are called
eight pillars in the development of TPM activity.
Of these four activities are for establishing the system for production
efficiency, one for initial control system of new products and equipment, one
for improving the efficiency of administration and are for control of safety,
sanitation as working environment
D - INSTITUTIONALIZING STAGE
By all there activities one would has reached maturity
stage. Now is the time for applying for PM award. Also think of challenging
level to which you can take this movement.
Organization Structure for TPM Implementation:
TPM Pillars
PILLAR 1 - 5S :
TPM starts with 5S. Problems cannot be clearly seen when
the work place is unorganized. Cleaning and organizing the workplace helps the team
to uncover problems. Making problems visible is the first step of improvement.
Japanese Term
|
English Translation
|
Equivalent 'S' term
|
Seiri
|
Organisation
|
Sort
|
Seiton
|
Tidiness
|
Stablize
|
Seiso
|
Cleaning
|
Shine
|
Seiketsu
|
Standardisation
|
Standardise
|
Shitsuke
|
Discipline
|
Susstain |
SEIRI -
Sort out :
This means sorting and organizing the items as critical,
important, frequently used items, useless, or items that are not need as of
now. Unwanted items can be salvaged. Critical items should be kept for use
nearby and items that are not be used in near future, should be stored in some
place. For this step, the worth of the item should be decided based on
utility and not cost. As a result of this step, the search time is reduced.
Priority
|
Frequency of Use
|
How to use
|
Low
|
Less than once per year, Once per year<
|
Throw away, Store away from the workplace
|
Average
|
At least 2/6 months, Once per month, Once per week
|
Store together but offline
|
High
|
Once Per Day
|
Locate at the workplace
|
SEITON - Stabilize (Organise ):
The concept here is that "Each items has a place, and
only one place". The items should be placed back after usage at the same
place. To identify items easily, name plates and colored tags has to be used.
Vertical racks can be used for this purpose, and heavy items occupy the bottom
position in the racks.
SEISO - Shine the
workplace :
This involves cleaning the work place free of burrs,
grease, oil, waste, scrap etc. No loosely hanging wires or oil leakage from
machines.
SEIKETSU -
Standardization :
Employees has to discuss together and decide on standards
for keeping the work place / Machines / pathways neat and clean. This standards
are implemented for whole organization and are tested / Inspected randomly.
SHITSUKE -Sustain ( Self
discipline) :
Considering 5S as a way of life and bring about
self-discipline among the employees of the organization. This includes wearing
badges, following work procedures, punctuality, dedication to the organization
etc.
PILLAR 2 - JISHU HOZEN ( Autonomous maintenance )
:
This pillar is geared towards developing operators to be
able to take care of small maintenance tasks, thus freeing up the skilled
maintenance people to spend time on more value added activity and technical
repairs. The operators are responsible for upkeep of their equipment to prevent
it from deteriorating.
Policy :
- Uninterrupted operation of equipment.
- Flexible operators to operate and maintain other
equipments.
- Eliminating the defects at source through active employee
participation.
- Stepwise implementation of JH activities.
JISHU HOZEN Targets:
- Prevent the occurrence of 1A / 1B because of JH.
- Reduce oil consumption by 50%
- Reduce process time by 50%
- Increase use of JH by 50%
Steps in JISHU HOZEN :
- Preparation of employees.
- Initial cleanup of machines.
- Take counter measures
- Fix tentative JH standards
- General inspection
- Autonomous inspection
- Standardization and
- Autonomous management.
Each of the above mentioned steps is discussed in detail
below.
Train the Employees : Educate the employees about TPM, Its advantages, JH advantages and Steps in JH. Educate the employees about abnormalities in equipments.
Initial cleanup of machines :Supervisor and technician should discuss and set a date for implementing step1. Arrange all items needed for cleaning
On the arranged date, employees should clean the equipment completely with the help of maintenance department. Dust, stains, oils and grease has to be removed.
- Following are the things that has to be taken care while
cleaning.
They are Oil leakage, loose wires, unfastened nits and bolts and worn
out parts.
After clean up problems are categorized and suitably tagged. White tags is place where problems can be solved by operators. Pink tag is placed where the aid of maintenance department is needed.Contents of tag is transferred to a register.Make note of area which were inaccessible.
- Finally close the open parts of the machine and run the
machine.
Counter Measures :
Inaccessible regions had to be reached easily. E.g. If
there are many screw to open a fly wheel door, hinge door can be used. Instead
of opening a door for inspecting the machine, acrylic sheets can be used.
To prevent work out of machine parts necessary action must
be taken.
Machine parts should be modified to prevent accumulation of
dirt and dust.
Tentative Standard :
JH schedule has to be made and followed strictly.
Schedule should be made regarding cleaning, inspection and
lubrication and it also should include details like when, what and how.
General Inspection :
The employees are trained in disciplines like Pneumatics, electrical, hydraulics, lubricant and coolant, drives, bolts, nuts and Safety.This is necessary to improve the technical skills of employees and to use inspection manuals correctly.
After acquiring this new knowledge the employees should
share this with others.
By acquiring this new technical knowledge, the operators
are now well aware of machine parts.
Autonomous Inspection :
New methods of cleaning and lubricating are used.
Each employee prepares his own autonomous chart / schedule in consultation with supervisor.Parts which have never given any problem or part which don't need any inspection are removed from list permanently based on experience.Including good quality machine parts. This avoid defects due to poor JH. Inspection that is made in preventive maintenance is included in JH.The frequency of cleanup and inspection is reduced based on experience.
Standardization :
Upto the previous stem only the machinery / equipment was the concentration. However in this step the surroundings of machinery are organized. Necessary items should be organized, such that there is no searching and searching time is reduced.Work environment is modified such that there is no difficulty in getting any item.Everybody should follow the work instructions strictly.
Necessary spares for equipment is planned and procured.
Autonomous Management :
OEE and OPE and other TPM targets must be achieved by continuous improve through Kaizen. PDCA ( Plan, Do, Check and Act ) cycle must be implemented for Kaizen.
PILLAR 3 - KAIZEN :
"Kai" means change, and "Zen" means
good ( for the better ). Basically kaizen is for small improvements, but
carried out on a continual basis and involve all people in the organization.
Kaizen is opposite to big spectacular innovations. Kaizen requires no or little
investment. The principle behind is that "a very large number of small
improvements are move effective in an organizational environment than a few
improvements of large value. This pillar is aimed at reducing losses in the
workplace that affect our efficiency. By using a detailed and thorough
procedure we eliminate losses in a systematic method using various Kaizen
tools. These activities are not limited to production areas and can be
implemented in administrative areas as well.
Kaizen Policy :
Practice concepts of zero losses in every sphere of
activity.
relentless pursuit to achieve cost reduction targets in all
resources
Relentless pursuit to improve over all plant equipment
effectiveness.
Extensive use of PM analysis as a tool for eliminating losses.
Focus of easy handling of operators.
Kaizen Target :
Achieve and sustain zero loses with respect to minor stops,
measurement and adjustments, defects and unavoidable downtime. It also aims to
achieve 30% manufacturing cost reduction.
Tools used in Kaizen :
- PM analysis
- Why - Why analysis
- Summary of losses
- Kaizen register
- Kaizen summary sheet.
The objective of TPM is maximization of equipment
effectiveness. TPM aims at maximization of machine utilization and not merely
machine availability maximization. As one of the pillars of TPM activities,
Kaizen pursues efficient equipment, operator and material and energy
utilization, that is extremes of productivity and aims at achieving substantial
effects. Kaizen activities try to thoroughly eliminate 16 major losses.
16
Major losses in a organisation
Loss
|
Category
|
·
Failure losses -
Breakdown loss
·
Setup / adjustment
losses
·
Cutting blade loss
·
Start up loss
·
Minor stoppage / Idling
loss.
·
Speed loss - operating
at low speeds.
·
Defect / rework loss
·
Scheduled downtime loss
|
Losses that
impede equipment efficiency
|
·
Management loss
·
Operating motion loss
·
Line organization loss
·
Logistic loss
·
Measurement and
adjustment loss
|
Loses that
impede human work efficiency
|
·
Energy loss
·
Die, jig and tool
breakage loss
·
Yield loss.
|
Loses that
impede effective use of production resources
|
Classification of losses :
Aspect
|
Sporadic
Loss
|
Chronic Loss
|
Causation
|
Causes for
this failure can be easily traced. Cause-effect relationship is simple to
trace.
|
This loss
cannot be easily identified and solved. Even if various counter measures are
applied
|
Remedy
|
Easy to
establish a remedial measure
|
This type of
losses are caused because of hidden defects in machine, equipment and
methods.
|
Impact /
Loss
|
A single
loss can be costly
|
A single
cause is rare - a combination of causes trends to be a rule
|
Frequency of
occurrence
|
The
frequency of occurrence is low and occasional.
|
The
frequency of loss is more.
|
Corrective
action
|
Usually the
line personnel in the production can attend to this problem.
|
Specialists
in process engineering, quality assurance and maintenance people are
required.
|
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