A Reliability Allocation Method of CNC Lathes Based on Copula Failure Correlation Model

Chinese Journal of Mechanical Engineering

Table 2 Allocation results according to the method proposed in Ref. [24]

Symbol of subsystems	Subsystems	Failure rate \(\hat{\lambda }_{i}\)	\(M\hat{T}BF_{i}\) (h)
M	Turret	0.000181	5523.56
J	Clamping accessory	0.000163	6140.60
V	Electric and electronic system	0.000141	7067.28
S1	Main transmission	0.000145	6890.52
X	X feed system	0.000158	6318.62
Z	Z feed system	0.000156	6398.46
NC	CNC system	0.000103	9679.27
E	Power supply	0.000123	8154.97
D	Hydraulic system	0.000138	7230.30
F	Servo system	0.000108	9222.45
W	Cooling system	0.000120	8305.45
K	Swarf conveyors	0.000135	7412.56
L	Lubricant system	0.000120	8346.89
S2	Spindle assembly	0.000131	7645.18
Q	Guard	0.000076	13099.09