ch 5 the 7 qc tools (1)

7/23/2019 Ch 5 the 7 QC Tools (1)

1/30

Chapter 4:Chapter 4: Quality Tools Quality Tools

CHE 590A: Quality Control

Professor Majdi Al-Mahasneh

Chemical Engineeringe!artment

"ordan #ni$ersity of %cience and &echnology

7/23/2019 Ch 5 the 7 QC Tools (1)

2/30

Quality Improvement: Problem Solving

Quality Control ToolsQuality Control Tools

Pareto chart

Histogram

Process flow diagram Check sheet

Scatter diagram

Control chart Run chart

Cause and effect diagram

7/23/2019 Ch 5 the 7 QC Tools (1)

3/30


Pareto PrinciplePareto Principle

Vilfredo Pareto (1848-1!"# $talian

economist

!%& of the 'o'ulation has 8%& of thewealth

uran used the term )*ital few+ tri*ial

man,. He noted that !%& of the /ualit,'ro0lems caused 8%& of the dollar loss.

7 Quality Tools7 Quality Tools

7/23/2019 Ch 5 the 7 QC Tools (1)

4/30


Pareto chartPareto chart


%Co

mplaints

7/23/2019 Ch 5 the 7 QC Tools (1)

5/30


ParetoParetoChartChartPercentfrome

achcause

Causes of 'oor /ualit,

1achine

cali0

ratio

ns

2efec

ti*e'

arts

3rong

dime

nsion

s

Poor

2esign

4'erato

rerro

rs

2efec

ti*em

aterials

Surfa

cea0rasio

ns%

1%

!%

"%

4%

5%

6%

7%(64#

(1"#(1%#

(6#("# (!# (!#

7/23/2019 Ch 5 the 7 QC Tools (1)

6/30


HistogramHistogram


7/23/2019 Ch 5 the 7 QC Tools (1)

7/30Quality Improvement: Problem Solving

HistogramHistogram

%

51%

15

!%

!5"%

"5

4%

1 ! 6 1" 1% 16 1 17 1! 16 !% 17 1" 5 6 ! 1

7/23/2019 Ch 5 the 7 QC Tools (1)


FlowchartsFlowcharts

lowcharts

9ra'hical descri'tion of how work is done.

:sed to descri0e 'rocesses that are to 0eim'ro*ed.


7/23/2019 Ch 5 the 7 QC Tools (1)


Flow DiagramsFlow Diagrams

; 2raw a flowchart for whate*er ,ou do.

:ntil ,ou do+ ,ou do not know what ,ou

are doing+ ,ou

7/23/2019 Ch 5 the 7 QC Tools (1)


Flowchart

Acti$ity

ecision>es>es

?o?o


7/23/2019 Ch 5 the 7 QC Tools (1)


FlowchartFlowchart

7/23/2019 Ch 5 the 7 QC Tools (1)



7/23/2019 Ch 5 the 7 QC Tools (1)

14/30

Process Chart SymbolsProcess Chart Symbols

'erations

$ns'ection

@rans'ortation

2ela,

Storage

7/23/2019 Ch 5 the 7 QC Tools (1)


Process ChartProcess Chart

%te!

'!eration

&rans!ort

(ns!ect

elay

%torage

istance

)feet*

&ime

)min*escri!tion

of

!rocess

+

,

.

5

/

1

9

+0

++

#nload a!!les from truc2

Mo$e to ins!ection station

3eigh4 ins!ect4 sort

Mo$e to storage

3ait until needed

Mo$e to !eeler

A!!les !eeled and cored

%oa2 in ater until needed

Place in con$eyor

Mo$e to mi6ing area

3eigh4 ins!ect4 sort

&otalPage + 0f .10

0

5

,0

+5

/0

0

,0

+90 ft

,0 ft

,0 ft

50 ft

+00 ft

ate: 9-0-00

Analyst: &78

7ocation: ra$es Mountain

Process: A!!le %auce

7/23/2019 Ch 5 the 7 QC Tools (1)


7/23/2019 Ch 5 the 7 QC Tools (1)


Check SheetCheck Sheet

ShiftsShifts

2

efect@,'e

2

efect@,'e


7/23/2019 Ch 5 the 7 QC Tools (1)


Check SheetCheck Sheet

CP?=?@S R=PABC=2 > AB

@$= P=R$2D !! e0 to !7 e0 18

R=PB$R @=CH?$C$B?D o0

@V S=@ 2=A 1%1"

$ntegrated Circuits

Ca'acitors

Resistors @ransformers

Commands

CR@

7/23/2019 Ch 5 the 7 QC Tools (1)


Cause-an-!""ect DiagramsCause-an-!""ect Diagrams

Show the relationshi's 0etween a

'ro0lem and its 'ossi0le causes.

2e*elo'ed 0, Eaoru $shikawa (15"#Blso known as F

ish0one diagrams

$shikawa diagrams


7/23/2019 Ch 5 the 7 QC Tools (1)


Cause an !""ectCause an !""ect

#Skeleton$#Skeleton$

Quality

Pro;lem

Materials

E

7/23/2019 Ch 5 the 7 QC Tools (1)


Fishbone DiagramFishbone Diagram

Gualit,

Pro0lem

achineseasurement Human

Process=n*ironment aterials

ault, testing e/ui'ment

$ncorrect s'ecifications

$m'ro'er methods

Poor su'er*ision

Aack of concentration

$nade/uate training

ut of ad

7/23/2019 Ch 5 the 7 QC Tools (1)


Cause an e""ect iagramsCause an e""ect iagrams

Bd*antages

making the diagram is educational in itself

diagram demonstrates knowledge of'ro0lem sol*ing team

diagram results in acti*e searches for

causes

diagram is a guide for data collection

7/23/2019 Ch 5 the 7 QC Tools (1)


Cause an e""ect iagramsCause an e""ect iagrams

@o construct the skeleton+ remem0erD

or manufacturing - the 4 Is

man+ method+ machine+ material

or ser*ice a''licationse/ui'ment+ 'olicies+ 'rocedures+ 'eo'le

7/23/2019 Ch 5 the 7 QC Tools (1)


Scatter DiagramScatter Diagram

.

7/23/2019 Ch 5 the 7 QC Tools (1)

25/30


%un Charts%un Charts

Run Charts (time series 'lot#

=Jamine the 0eha*ior of a *aria0le o*er

time.

asis for Control Charts

7/23/2019 Ch 5 the 7 QC Tools (1)

26/30


Control ChartControl Chart

18

1!

6

"

15

!1

!4

!7

! 4 6 8 1% 1! 14 16

Sam'le num0er

?um0erofd

efects

:CA K !"."5

ACA K 1.

cK 1!.67

Control ChartsControl Charts

Control Chartsontrol harts

7/23/2019 Ch 5 the 7 QC Tools (1)

27/30


Control ChartsControl Charts Control Chartsontrol harts

7/23/2019 Ch 5 the 7 QC Tools (1)

28/30


##Stem an lea"$ isplaysStem an lea"$ isplays

4.6 4.0 3.7 4.1 4.1 5.6 4.5 6.0 6.0 3.4

3.4 4.6 3.7 4.2 4.6 4.7 4.1 3.7 3.4 3.3

3.7 4.1 4.5 4.6 4.4 4.8 4.3 4.4 5.1 3.9

Data

Integrated Circuit Response Time (ps)

7/23/2019 Ch 5 the 7 QC Tools (1)

29/30


##Stem an lea"$ isplaysStem an lea"$ isplays

3 7 4 4 7 7 4 3 7 9

4 6 0 1 5 6 2 6 7 1 1 5 6 4 8 3 4

5 6 1

6 0 0


7/23/2019 Ch 5 the 7 QC Tools (1)

30/30

Dot iagramsDot iagrams

3 4 5 6

Plant A

Plant B


ch 5 the 7 qc tools (1)

Documents