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Spot welding process optimization to reduce cost

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Slide number: *
Process Optimization
6σ
Process Optimization
	Process selected	 PROJECTION WELDING
	Plant	JAY BHARAT MARUTI LTD.-1
	Name of the Leader	 SIX SIGMA BLACK BELT
1)SUNIL DHANKHAR
2).Mr. MUKESH AHUJA
	1.Mr. RAKESH KUMAR
	Date of Start	14TH JULY 2008
Slide number: *
Process Optimization
6σ
P
Planning
A
Analyse
I
Improve
C
Control
PLANNING
ANALYSE
IMPROVE
CONTROL
Slide number: *
Process Optimization
6σ
Phase – 1- Planning
Project Planning
	Phase	JULY 2008	 AUG.2008	SEPT.2008
	W1	W2	W3	W4	W1	W2	W3	W4	W1	W2	W3	W4
	Plan
	Analyze
	Improve
	Control
	Phases	Planned Start date	Planned Completion date	Actual start date	Actual completion date	Status
	Plan	14.07.08	14.07.08	14.07.08	14/07/2008	Completed
	Analyze	15.07.08	19.07.08	19.07.08	21.07.08	Completed
	Improve	25.07.08	28/07/2008	28.07.08	04.08.08	Completed
	Control	01/08/2008	15/08/2008	06.08.08	07.08.08	Completed
Slide number: *
Process Optimization
6σ
Phase – 1- Planning
	No.	Parameter
	1	Process selected	SPOT WELDING
	2	Part number selected for study	MBR FENDER APRON ALTO RH
	3	Machine selected for study	MSW -10
	4	Other similar part numbers where the optimal setting can be deployed	MBR FENDER APRON ALTO LH & OTHER SEVERAL PARTS FOR DIFFERENT MODEL
	5	Responses 	Description	Type of response (Var./Att.)	Specification
	NUGGET DIA	Variable	3.0MM (MIN)
Slide number: *
Process Optimization
6σ
Phase – 1- Planning
Photograph of the part
Response Y = A. NUGGET DIA Specification : 3.0MM Minimum.
Response ( Y )
M/C – MSW-10
NO.OF SPOTS :20
15.bin
Slide number: *
Process Optimization
6σ
Phase – 1- Planning
	Design Parameters identified for Optimization
	
	SR.NO.	PROCESS PARAMETER
	A	CURRENT
	B	WELD TIME
Slide number: *
Process Optimization
6σ
Phase – 1 – Planning
	Sr. No.
 	Parameter	UOM	( - Setting )	( + Setting )
	A	CURRENT	KVA	8.0	7
	B	WELD CYCLE	CYCLE	12	10
Slide number: *
Process Optimization
6σ
P
Planning
A
Analyze
I
Improve
C
Control
PLANNING
ANALYSE
IMPROVE
CONTROL
Slide number: *
Process Optimization
6σ
Phase – 1- Problem Definition
PC
PPC
CS
MCS
CC
B v c
OBSER
VS
FF
Legend: PC – Paired Comparison, PPC – Product/Process search, CS – Component Search, MCS – Modified Component Search, CC – Concentration chart
 MVA – Multi-Vari analysis, OBSER – Observation, VS – Variable Search, FF – Full Factorial
	SSV’s
	SPOT WELDING PROCESS
	1. PROCESS PARAMETER
Slide number: *
Process Optimization
6σ
Phase – 2- Measure and Analyze
Analysis # 1
	Technique/Tool used:
	1. VARRIABLE SEARCH
	 Objective:
	 Process Parameter Optimization for reducing ENERGY Cost . 
 
Slide number: *
Process Optimization
6σ
Phase – 2 – Analyze Step -1
Conclusion:
D/d ratio is < 3 so step o is incorrect
	Test	- Setting	+ Setting
	1st Trial	5.1	5.37
	2nd Trial	5.45	5.0
	3rd Trial	6.49	5.68
	Median	5.45	5.37
	Range	1.39	0.68
	D ( Difference Between Two Medians )	0.08
	d = Average of Two Ranges	1.03
	D/d	0.08
Slide number: *
Process Optimization
6σ
2nd TRIAL 
Phase – 2 – Analyze Step -1
	Sr. No.
 	Parameter	UOM	( - Setting )	( + Setting )
	A	CURRENT	KVA	7.0	6.5
	B	WELD CYCLE	CYCLE	10	8
Slide number: *
Process Optimization
6σ
Conclusion:
D/d ratio is > 3 so step o is correct
Phase – 2 – Analyze Step -1
	Test	- Setting	+ Setting
	1st Trial	6.08	4.18
	2nd Trial	6.07	4.5
	3rd Trial	5.90	4.22
	Median	6.07	4.22
	Range	0.18	0.32
	D ( Difference Between Two Medians )	1.85
	d = Average of Two Ranges	0.25
	D/d	7.4
Slide number: *
Process Optimization
6σ
Phase – 2 – Analyze Step -1
	Median(+)	4.22
	Median(-)	6.07
	Average of Medians ( Decision Line )	5.14
	d	0.25
	1.45*d	0.36
	1.45*d (after rounding off to the same decimal place as data. Always round off to higher number)	0.40
	UDL(+) = Median(+) + 1.45*d	4.22+0.36=4.58
	LDL(+) = Median(+) – 1.45*d	3.86
	UDL(-) = Median(-) + 1.45*d	6.43
	LDL(-) = Median(-) – 1.45*d	5.71
Slide number: *
Process Optimization
6σ
Phase – 2 – Analyze 
Step -2 – Method #1 data collection
	TRIAL NO	-
	+
	DECISION LINE	UDL +	LDL +	UDL -	LDL -	Conclusion 	Contribution 
	1 st Trial	6.08	4.18	5.14	4.58	3.86	6.43	5.71	 	 
	2 nd Trial	6.07	4.5	5.14	4.58	3.86	6.43	5.71	 	 
	3 rd Trial	5.90	4.22	5.14	4.58	3.86	6.43	5.71	 	 
	A	5.5	5.6	5.14	4.58	3.86	6.43	5.71	ONE OF THE IMPORTANT PARAMETER
	B	5.6	5.5	5.14	4.58	3.86	6.43	5.71	ONE OF THE IMPORTANT PARAMETER
	AB	3.13	5.95	5.14	4.58	3.86	6.43	5.71	BOTH ARE THE IMPORTANT PARAMETER
Slide number: *
Process Optimization
6σ
Phase – 2 – Analyze 
Step -2 – Method #1 data collection
Chart1
		Ist run		Ist run		Ist run		Ist run		Ist run		Ist run		Ist run
		2nd run		2nd run		2nd run		2nd run		2nd run		2nd run		2nd run
		3rd run		3rd run		3rd run		3rd run		3rd run		3rd run		3rd run
		A		A		A		A		A		A		A
		B		B		B		B		B		B		B
		AB		AB		AB		AB		AB		AB		AB
6.08
4.18
4.58
3.86
6.43
5.71
5.14
6.07
4.5
4.58
3.86
6.43
5.71
5.14
5.9
4.22
4.58
3.86
6.43
5.71
5.14
5.5
5.6
4.58
3.86
6.43
5.71
5.14
5.6
5.5
4.58
3.86
6.43
5.71
5.14
3.13
5.95
4.58
3.86
6.43
5.71
5.14
Sheet1
		projection welding
				- setting		+setting		UDL+		LDL+		UDL-		LDL-		DL
		Ist run		626		351		408		293		644		529		468
		2nd run		586		350		408		293		644		529		468
		3rd run		564		334		408		293		644		529		468
		A		400		630		408		293		644		529		468
								408		293		644		529		468
						1		0.9		0.8		0.7		0.6		0.5		0.4		0.3		0.2		0.1		0
						11		10.8		10.6		10.4		10.2		10		9.8		9.6		9.4		9.2		9
Sheet2
		PROBLEM : OPTIMIZATION OF SPOT WELDING(FENDER ALTO)
				spot welding
						- setting		+setting		UDL+		LDL+		UDL-		LDL-		DL
				Ist run		6.08		4.18		4.58		3.86		6.43		5.71		5.14
				2nd run		6.07		4.5		4.58		3.86		6.43		5.71		5.14
				3rd run		5.9		4.22		4.58		3.86		6.43		5.71		5.14
				A		5.5		5.6		4.58		3.86		6.43		5.71		5.14
				B		5.6		5.5		4.58		3.86		6.43		5.71		5.14
				AB		3.13		5.95		4.58		3.86		6.43		5.71		5.14
Sheet2
		
Sheet3
		PROBLEM : OPTIMIZATION OF TUBE NUT WELDING
						- setting		+setting		UDL+		LDL+		UDL-		LDL-		DL
				Ist run		890		810		910		750		990		820		870
				2nd run		910		840		910		750		990		820		870
				3rd run		970		830		910		750		990		820		870
				A						910		750		990		820		870
				B						910		750		990		820		870
				C						910		750		990		820		870
				D						910		750		990		820		870
																								2.5263157895
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626
586
564
400
351
350
334
630
0
100
200
300
400
500
600
700
Ist run2nd run3rd runA
MBD00011E4F.xls
Chart3
			Ist run			Ist run			Ist run			Ist run			Ist run			Ist run			Ist run
			2nd run			2nd run			2nd run			2nd run			2nd run			2nd run			2nd run
			3rd run			3rd run			3rd run			3rd run			3rd run			3rd run			3rd run
			A			A			A			A			A			A			A
									408			293			644			529			468
626
351
408
293
644
529
468
586
350
408
293
644
529
468
564
334
408
293
644
529
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400
630
408
293
644
529
468
Sheet1
			
			S.NO.			PART NAME			MODEL			PROBLEM REPORTED			ACTION TO BE TAKEN			TGT DATE			STATUS
			1			RUB			CAR			1) LPG CYLINDER MNTG.POSN. NG			CYLINDER MNTG POSITION TO BE SHIFTED IN PNL FLLOR IN BL(+) DIRECTION BY I.00 MM			31.05.08
												2) FUEL TANK MNTG POSITION NOT AS PER SPECS			FUEL TANK MNTG POSN. CORRECTED IN BL DIRECTION .TL DIRECTION POSN. TO BE CORRECTED IN W/JIG.			29.05.08			COMPLETED
												3) URASTUN MBR SUPPLY			SAMPLES ALREADY RECD & TRAIL WILL BE DONE WITH MODIFIED SAMPLES AT MSIL.SUPPLY WILL BE STARTED AFTER FEEDBACK FROM MSIL.			10.06.08
												4) MUFFLER MNTG POSN.CHILD PART (HANGER MUFFLER -62621) TO CHECKED AS PER REF. SAMPLE & CORRECTION TO BE DONE (IF REQD.)			28.05.06 & 05.06.08			GOING ON
			2			FUB			CAR			1) GAUGE QUALIFICATION			GAUGE ALREADY MADE. VARIATION IS OBSD.ANALYSIS TO DONE TO IDENTIFY THE ROOT CAUSE & CORRECTION WILL BE DONE THEREAFTER.			02.06.08
												2) COWL TOP			STUD POSITION CHECKED IN LHD PART ( COWL UPPER) BODY TO BE MADE & RECHECKING OF STUD POSITION WILL BE DONE TO IDENTIFY THE VARIATION & CORRECTION WILL BE DONE THEREAFTER.			31.05.08
												3) RACK CASE POSITION			"X" MBR DASH PANEL TO CHECKED & CORRECTION WILL BE DONE THERAFTER			30.05.08
			3			FRONT END			ALTO			VARIATION IN JIG TO JIG			1)WELD JIG NO -2 IS CORRECTED & MADE SIMILAR TO JIG-1.			23.05.08			COMPLETED
															2) PNL LAMP SUPPORT TO BE CHECKED ON PANEL CHECKER & CORRECTION WILL BE DONE THERAFTER.			28.05.08 & 05.06.08			LAMP SUPPORT CHECKED & FOUND O.K
			4			TAIL SKIRT			ALTO			SHOWER LEAKAGE			1) PROFILE OF CHILD PART A65411 IS CORRECTED IN THE TOOL.			23.05.08			COMPLETED
															2) CHILD PART A65421 - GAP & FLUSH TO ME MADE AS PANEL CHECKER.			29.05.08
			5			PANEL DASH SIDE			VERSA			INSTRUMENT PNL BKT POSN NOT AS SPECS			WELD JIG CORRECTED. SUPPLY IS GOING ON. REPORT ALSO SUBMITTED TO P.I			19.05.08			COMPLETED
			6			TAIL SKIRT			W.R			FLANGE MISMATCH LESS			WELD JIG CORRECTED. SUPPLY IS GOING ON.			23.05.08			COMPLETED
			7			FRNT PILLAR			OMNI			ROCKING			ASSY. CHECKED AT JBML & MSIL ,FOUND O.K			27.05.08			COMPLETED
			8			NUT MISS			OMNI & GYPSY			100% MARKING BY OPERATOR ITSELF STARTED TO ENSURE THE PRESENCE OF NUT?BOLTS						IMMEDIATE			CONTINEOUS
			9			CLAMP BKG.			OMNI HEAD LAMP			OPERATOER INSTRUCTED TO TAKE CARE WHILE SPOTTING ON CLAMP FOR PLASTIC COATING AND IMMEDIATELY FILE ELECTRODE IF SPOTTED OVER COATING ALONG WITH SPOT STENGTH CHECKING FOR WELDED CLAMP.						IMMEDIATE			CONTINEOUS
			10			DENT ON FRNT END			W.R			PROTECTOR PLATE GOT BEND CAUSING DENT ON UPPER MBR. NOW PLATE POSITIONING CORRECTED.						IMMEDIATE			CONTINEOUS
			11			BOLT LOOSE			ALTO			MANPOWER IS DEPLOYED TO CHECK 100% TIGHTENING OF BOLTS.						IMMEDIATE			CONTINEOUS
Sheet2
						- setting			+setting			UDL+			LDL+			UDL-			LDL-			DL
			Ist run			626			351			408			293			644			529			468
			2nd run			586			350			408			293			644			529			468
			3rd run			564			334			408			293			644			529			468
			A			400			630			408			293			644			529			468
												408			293			644			529			468
									1			0.9			0.8			0.7			0.6			0.5			0.4			0.3			0.2			0.1			0
									11			10.8			10.6			10.4			10.2			10			9.8			9.6			9.4			9.2			9
Sheet2
			
Sheet3
			
UDL+
LDL+
Slide number: *
Process Optimization
6σ
Phase – 2 – Analyze 
Step -3 – Factorial analysis
35.bin
Slide number: *
Process Optimization
6σ
Phase -2 Analyze – Step # 4 – Factorial plots
36.txt
��������Interaction Plot for response���������������������������������������������������������������������������������������������������������������»+������3+��Interaction Plot for response���������������������������������������������������������������������������������������������������;; HMF V1.24 TEXT
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Slide number: *
Process Optimization
6σ
Phase -2 Analyze – Step # 4 – Factorial plots
37.bin
Slide number: *
Process Optimization
6σ
Phase -2 Analyze – Step # 4 – Factorial plots
38.txt
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Slide number: *
Process Optimization
6σ
Phase -2 Analyze – Step # 6 – Optimization
39.bin
Slide number: *
Process Optimization
6σ
Optimal Settings identified using Minitab
Phase -2 Analyze – Step # 6 – Optimization
USING MINITAB, THE OPTIMAL SETTING IS :
	CURRENT : 6.8 KAMP
	WELD TIME : 8 CYCLE WHEREAS D = 1WHICH MEANS THE SETTING GIVES RESPONSE EXACTLY THE TARGET VALUE
Slide number: *
Process Optimization
6σ
Optimal Settings identified 
Phase -2 Analyze – Step # 6 – Optimization
	Sr. No.
 	Parameter	UOM	( - Setting )	( + Setting )	OPTIMAL SETTING
	A	CURRENT	KVA	8	6.5	6.8
	B	WELD CYCLE	CYCLE	12	8	8
	C	ELECTRODE PRESSURE	Kg/cm2	200	200	200
	D	SQUEEZE CYCLE	CYCLE	12	12	12
	E	HOLD CYCLE	CYCLE	6	3	3
Slide number: *
Process Optimization
6σ
Phase -2 Analyze – Step # 6 – Optimization
	Objective of Y	Higher better/ Lower better / Nominal better
	Upper boundary of Y
	Lower boundary of Y	4.26 MM (Min)
Slide number: *
Process Optimization
6σ
P
Planning
A
Analyze
I
Improve
C
Control
PLANNING
ANALYSE
IMPROVE
CONTROL
Slide number: *
Process Optimization
6σ
Phase – 3 - Improve
Validation using B vs C
	1	Part number selected for validation	MBR FENDER APRON ALTO RH 
	2	Better Condition	OPTIMUM SETTING
	Current Condition	-
	3	Sample size 	3B,3C
	4	Sample type	Pieces
	5	Response decided for monitoring	 4.26 MM
Slide number: *
Process Optimization
6σ
Phase – 3 - Improve
Data obtained during validation
	Piece / Lot	Better ( B )	Current ( C )
	1	6.6	5.1
	2	5.89	5.45
	3	5.42	6.49
Slide number: *
ProcessOptimization
6σ
Analysis - B Vs C
Phase – 3 - Improve
	1	Part number selected for validation	MBR FENDER APRON ALTO RH
	2	Average of B	5.97
	Average of C	5.68
	3	Xb – Xc (Amount of Improvement)	0.29
	4	Sigma (B)	0.48
	5	Is Xb-Xc greater than k*Sigma (b)	Not Required
Slide number: *
Process Optimization
6σ
P
Planning
A
Analyze
I
Improve
C
Control
PLANNING
ANALYSE
IMPROVE
CONTROL
Slide number: *
Process Optimization
6σ
CONTROL
Phase – 4 - Control
	REVISION OF PARAMETERS IN JBPS - COMPLTD
	REVISION OF CONTROL PLAN -COMPLTD
	REVISION OF PFMEA - COMPLTD
	SAVINGS – 15 LACS ( APPROX) / ANUM WHEN DEPLOYED ACROSS THE SHOP 
Slide number: *
Process Optimization
6σ
Thank You
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