5. PROBLEM
IN ORDER TO MAINTAIN THE PULL-OFF LOAD
SAFELY, WE INVITE SPATTER MARKS AND LEAKAGE
PROBLEM. THIS IS BECAUSE, WE HAVE DETECTION
MECHANISM FOR LEAKAGE AND SPATTER BUT FOR
PULL-OFF LOAD WE HAVE TO DO DESTRUCTIVE
TESTING.
OBJECTIVE
REDUCE LEAK
2. REDUCE SPATTER
3. MAINTAIN PULL-OFF LOAD AT
OPTIMUM LEVEL WITH LESS
VARIATION.
1.
29-07-2004
Suspa Pneumatics (I) Ltd
5
6. PAST DATA - LEAK
QUALITY CONTROL DEPATRMENT
EMXI - MO NTHL Y PPM TREND CHART - L EAK
100000
10000
1000
100
10
1
JAN
FEB
MAR
APR
MAY
JUN
PPM
MONTH
PROD
LEAK
PPM
JAN
18815
113
6006
29-07-2004
FEB
20000
55
2750
MAR
20794
320
15389
APR
15180
128
8432
Suspa Pneumatics (I) Ltd
MAY
11435
120
10494
JUN
23321
350
15008
6
7. PAST DATA - SPATTER
QUALITY CONTROL DEPATRMENT
EMXI-MONTHL Y PPM TREND CHA RT - SPA TTER
10000
1000
100
10
1
JAN
FEB
MAR
APR
MAY
JUN
PPM
MONTH
PROD
SPATTER
PPM
JAN
18815
1
53
29-07-2004
FEB
20000
10
500
MAR
20794
120
5771
APR
15180
105
6917
Suspa Pneumatics (I) Ltd
MAY
11435
79
6909
JUN
23855
135
5659
7
13. SUM OF SQUARES
FROM AVG DATA
A
B
C
D
AB
AC
AD
29-07-2004
1
2933
2991
3114
3018
3055
3108
3012
2
3222
3164
3041
3137
3100
3047
3143
Suspa Pneumatics (I) Ltd
1~2
288
173
72
119
46
60
132
(1~2)2/8
10390
3745
650
1773
259
452
2162
13
14. ANOVA TABLE
FROM AVG DATA
SOURCE OF
VARIATION
Voltage
Thickness
Volt x Thick
Ram Pre.
Volt x Ram Pre
Delay
Volt x Delay
Error (Pooled)
Total
Nota
Mean Sqr. F Ratio
Pool D.F. S.S
tion
SS/DF
SS/EMS
A
N
1 10390
10390
22.92
B
N
1 3745
3745
8.26
AxB
Y
1
259
259
0.57
C
Y
1
650
650
1.43
AxC
Y
1
452
452
1.00
D
N
1 1773
1773
3.91
AxD
N
1 2162
2162
4.77
3 1360
453
19430
From F Table
F1,3 (1%) = 34.12
F1,3 (5%) = 10.13
29-07-2004
Suspa Pneumatics (I) Ltd
14
15. SUM OF SQUARES
FROM S/N DATA
A
B
C
D
AB
AC
AD
29-07-2004
1
70.39
94.12
92.81
92.75
96.11
94.34
90.45
2
118.94
95.21
96.52
96.58
93.22
94.99
98.88
1~2
48.56
1.08
3.71
3.83
2.88
0.65
8.42
Suspa Pneumatics (I) Ltd
(1~2)2/8
294.73
0.15
1.72
1.83
1.04
0.05
8.87
15
16. ANOVA TABLE
FROM S/N DATA
SOURCE OF
VARIATION
Voltage
Thickness
Volt x Thick
Ram Pre.
Volt x Ram Pre
Delay
Volt x Delay
Error (Pooled)
Total
Nota Pool D.F. S.S
Mean Sqr. F Ratio
tion
SS/DF
SS/EMS
A
N
1
295
294.73
317.29
B
Y
1
0.15
0.15
0.16
AxB
Y
1
1.04
1.04
1.12
C
Y
1
1.72
1.72
1.85
AxC
Y
1
0.05
0.05
0.06
D
Y
1
1.83
1.83
1.97
AxD
N
1
8.87
8.87
9.55
5
4.64
0.93
308.4
From F Table
F1,5 (1%) = 16.26
F1,5 (5%) = 6.61
29-07-2004
Suspa Pneumatics (I) Ltd
16
17. RESPONSE TABLE
FROM AVG DATA
FACTOR CODE LEVEL RESPONSE
1
733.33
Voltage
A
2
805.40
1
747.73
Thickness
B
2
791.00
1
778.38
Ram Pre.
C
2
760.35
1
754.48
Delay
D
2
784.25
Diff
72
43
18
30
Preferred Combination
A2-B2-C1-D2
29-07-2004
Suspa Pneumatics (I) Ltd
17
18. RESPONSE TABLE
FROM S/N DATA
FACTOR CODE
Voltage
A
Thickness
B
Ram Pre.
C
Delay
D
LEVEL
1
2
1
2
1
2
1
2
RESPONSE
17.60
29.74
23.53
23.80
23.20
24.13
23.19
24.15
Diff
12
0.3
0.9
1.0
Preferred Combination
A2-B2-C2-D2
29-07-2004
Suspa Pneumatics (I) Ltd
18
19. SUMMARY OF RESULTS
OPT. COMB.
(AVE. TABLE)
Voltage-A
A2
Thick-B
B2
Ram Pre-C
C1
Delay-D
D2
FACTORS
FACTOR SIG. OPTIMAL COMB.
(AVE. TABLE) (SNR TABLE)
A
A2
B
B2(Marginal)
Not Significant
C2(Marginal)
Not Significant
D2(Marginal)
FACTOR SIG.
(SNR TABLE)
A
Not Significant
Not Significant
Not Significant
1. VOLTAGE SHOULD BE MAINTAINED AT 275.
2. SINCE THICKNESS VALUE IS NOT
SIGNIFICANT, THE PRESENT TOLERANCE OF
1.9~2.5 CAN BE MAINTAINED.
3. RAM PRESSURE, 40 IS BETTER THAN 35
4. DELAY TIME 2 IS BETTER THAN 1. BUT 1 CAN
BE TRIED FOR PRODUCTIVITY PURPOSE.
29-07-2004
Suspa Pneumatics (I) Ltd
19
20. CONCLUSION
1. CONSIDERING PULL-OFF LOAD ALONE, HHHH
COMBINATION IS BETTER.
2. CONSIDERING PULL-OFF LOAD AND SPATTER
MARKS, HLHL COMBINATION IS BETTER.
3. CONFIRMATORY TRIALS TO BE CONDUCTED WITH
HLHL & HHLH TO COMPARE THE RESULTS. HLHL IS
BETTER IN TERMS OF PRODUCTIVITY.
29-07-2004
Suspa Pneumatics (I) Ltd
20
