Taguchi method

Taguchi's Method

Submitted by

Chandrmouli Singh

MBA(AB) II Year

12/12/13 IABM Bikaner 2

Flow of Presentation Introduction

Principles contribution

Categories of threat optimisation

8 steps in Taguchi's methodology

Taguchi's method and Indian Environment

Taguchi's method and ISO 9000

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Introduction Taguchi Method is a new engineering design optimisation

methodology that improves the quality of existing products and processes and simultaneously reduces their costs very rapidly, with minimum engineering resources and development man-hours

The Taguchi Method achieves this by making the product or process performance "insensitive" to variations in factors such as materials, manufacturing equipment, workmanship and operating conditions. Taguchi method makes the product or process robust and therefore is also called as ROBUST DESIGN

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Priciple ContributionTaguchi's principle contributions to statistics are

Taguchi loss-function

The philosophy of off-line quality control

Innovations in the design of experiments

Contd...

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Taguchi loss-function

Adopted R A Fishers's methodology to improve mean outcome of process

Excessive variation lay at the root of poor manufactured quality Invovled cost to society with cost of quality Industrial experiments seek to maximise an appropriate signal to

noise ratio representing the magnitude of the mean of a process as compared to its variation

Contd...

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The philosophy of off-line quality control

The best opportunity to eliminate variation is during design of a product and its manufacturing process

System designDesign at the conceptual level involving creativity and innovation

Parameter designNominal values of the various dimensions and design parameters need to be set

Tolerance designUnderstanding of the effect that the various parameters have on performance, resources can be focused on reducing and controlling variation in the critical few dimensions

Contd...

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Innovations in the design of experiments

Outer arrays

An orthogonal array that seeks deliberately to emulate the sources of variation that a product would encounter in reality

An example of judgement sampling

Alternative approach is Chunk variable by Ellis R. Ott Management of interactions Analysis of experiments

Novel applications of the analysis of variance and minute analysis

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Categories of threat optimisationStatic Problems

A process to be optimized has several control factors which directly decide the target or desired value of the output

The optimization then involves determining the best control factor levels so that the output is at the the target value

P diagram

Contd...

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Batch Process Optimization

Smaller the better

n = -10 Log10 [ mean of sum of squares of measured data]

when there is difference between measured and ideal value

n = -10 Log10 [ mean of sum of squares of {measured - ideal} ]

Larger the better

n = -10 Log10 [mean of sum squares of reciprocal of measured data]

Contd...

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Nominal the best

Square of mean

n = 10 Log10 ----------------------------

Variance

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Dynamic Problem

If the product to be optimized has a signal input that directly decides the output, the optimization involves determining the best control factor levels so that the "input signal / output" ratio is closest to the desired relationship

P diagram

Contd...

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Technological Development

Sensitivity (Slope)

Case I: Larger the better

n = 10 Log10 [square of slope or beta of the I/O characteristics]

Case II: Smaller the better

n = -10 Log10 [square of slope or beta of the I/O characteristics]

Linearity (Larger the better)

Square of slope or beta

n = 10 Log10 -------------------------------------

Variance

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8 steps in Taguchi's method

Identify the main function, side effects, and failure mode

Identify the noise factors, testing conditions, and

quality characteristics

Identify the objective function to be optimized

Identify the control factors

and their levels

Select the orthogonal array

matrix experiment

Conduct the matrix experiment

Analyze the data, predict the

optimum levels and performance

Perform the verification

experiment and plan the future

action

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Taguchi's method and Indian Environment The liberal economic policy of globalisation Large multinationals are purchasing hefty equity stakes in large

Indian companies Revamping and restructuring them to suit their own product ranges Producing world class quality products at globally competitive

prices Indian industry desperately requires Product Design to optimise the

existing products and processes The industry could reduce their costs drastically through product

(process) design optimisation

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Taguchi's method and ISO 9000 The ISO-9000 aims at improving the capability of an organisation as

a whole to manufacture products to specified technical specification and quality standards and to deliver them to the customer on time.

Taguchi Method deals the product design itself, through product and process design optimisation it improves product quality and reduces costs drastically

Taguchi Method and ISO-9000 thus complement each other.

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Thank you...