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Quality Function Deployment (QFD)

Mohan KhondMechanical Engineering DepartmentCollege of Engineering , Pune

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Learning Objectives

The basic aim of presentation is to describe

the methodology of QFD.Various Steps associated in QFD and thedevelopment of interrelationship matrix.

Application of QFD with suitable illustrationand case study .

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Why QFD?

Survival in world class competition

Retaining and enhancing market shareShorter product development cycleCustomer awareness

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Quality Function Deployment

Quality function deployment is literal translation of theJapanese words HIN SHIT SU KINO TENKAI

The concept of QFD was introduced in Japan by YOJIAKAO in 1986

The QFD methodology was developed at Mitsubishis KobeShipyard

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Quality- Quality is what the customer says it is.(A. Feigenboum)Function -In this case it is aim, purpose, operation,or actionDeployment - The meaning of deployment is to operationalised or to bring out

QFD defined as a series of translations from customer needs to product characteristics and ultimately to

manufacturing procedures .

Quality function Deployment is a team-based management tool in which customer expectation are used to drive the

product development process

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It is disciplined approach to product design, engineering,and production and to provide in depth evaluation of

product.Customer needs are operationalised as production processinstruction that will produce outputs with desiredcharacteristics.

This method has been described as set of planning andcommunication routines that facilitate cooperation betweenmarketing, design, and manufacturing during design process.

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Characteristics of QFD

Qualitative technique.

Use of Interdisciplinary team.Uncovering new problems and facts .Customer driven

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Steps in QFD

List Customer Requirements. (WHATs)List Technical Descriptors. (HOWs)Develop an relationship matrix between WHATs andHOWsDevelop an Interrelationship matrix between HOWsCompetitive Assessment

Develop Prioritized Customer RequirementDevelop Prioritized Technical DescriptorsCalculation of Absolute and Relative Weight.

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Case study

A company that manufactures bicycle

components such as cranks, hub, rims, etc,wants to expands their product line by also producing handlebar stems for mountainbikes.

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Adding relationship Matrix to the House of Quality

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Interrelationship Between Technical Descriptors

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Adding prioritized customer requirement

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Calculation

Absolute weight is product of Column in the relationshipmatrix and importance to customer e.g.For Aluminum(9x8+ 1x5+ 9x5+ 9x2+ 9x7+ 3x5+ 3x3)=227Relative weight is determined by taking the dot product of

column in relationship matrix and column for absoluteweight in prioritized customer requirementFor die casting (3x16+ 9x8+ 9x5+ 3x2+ 0x18+ 3x5+9x3)=213

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Conclusion

It is based on the calculation of absoluteweight for technical descriptor and relativeweight for technical descriptor Greater value of absolute weight indicate thathandle bar Aluminum die casting.The relative weight also indicate that handle

bar stem should be Aluminum die casting .

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Thank you