Table 3 Allocation results considering failure correlation
From: A Reliability Allocation Method of CNC Lathes Based on Copula Failure Correlation Model
Symbol of subsystems | Subsystems | Failure rate \(\hat{\lambda }_{i}\) | \(M\hat{T}BF_{i}\)/h |
|---|---|---|---|
M | Turret | 0.000263 | 3807.09 |
J | Clamping accessory | 0.000236 | 4243.78 |
V | Electric and electronic system | 0.000205 | 4884.65 |
S1 | Main transmission | 0.000209 | 4794.22 |
X | X feed system | 0.000228 | 4388.07 |
Z | Z feed system | 0.000228 | 4388.07 |
NC | CNC system | 0.000151 | 6638.35 |
E | Power supply | 0.000178 | 5627.63 |
D | Hydraulic system | 0.000201 | 4978.54 |
F | Servo system | 0.000159 | 6314.63 |
W | Cooling system | 0.000174 | 5752.63 |
K | Swarf conveyors | 0.000197 | 5076.12 |
L | Lubricant system | 0.000174 | 5752.63 |
S2 | Spindle assembly | 0.000189 | 5283.23 |
Q | Guard | 0.000112 | 8926.36 |