From: Weakness Ranking Method for Subsystems of Heavy-Duty Machine Tools Based on FMECA Information
Index | \(\overline{\lambda }_{i}\) | ★Ei | ★Di | RPNi | Ci | ★CRi | ★Ti | ★Fi |
---|---|---|---|---|---|---|---|---|
Basic component | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Headstock | 0.030 | 0.056 | 0.037 | 0.017 | 0.041 | 0.047 | 0.135 | 0.128 |
Feed system | 0.083 | 0.092 | 0.047 | 0.052 | 0.080 | 0.127 | 0.191 | 0.187 |
Tool holder | 0.035 | 0.072 | 0.051 | 0.032 | 0.052 | 0.058 | 0.215 | 0.207 |
CNC system | 0.050 | 0.069 | 0.080 | 0.173 | 0.055 | 0.087 | 0.022 | 0.021 |
Electrical system | 0.106 | 0.117 | 0.086 | 0.336 | 0.164 | 0.069 | 0.018 | 0.018 |
Chip removal system | 0.058 | 0.038 | 0.027 | 0.027 | 0.030 | 0.017 | 0.014 | 0.012 |
Hydraulic system | 0.253 | 0.140 | 0.189 | 0.082 | 0.229 | 0.344 | 0.111 | 0.116 |
Center rest | 0.085 | 0.073 | 0.117 | 0.060 | 0.073 | 0.039 | 0.028 | 0.036 |
Spider device | 0.023 | 0.015 | 0.024 | 0.006 | 0.011 | 0.027 | 0.004 | 0.004 |
Tailstock | 0.025 | 0.034 | 0.068 | 0.019 | 0.026 | 0.027 | 0.076 | 0.079 |
Grinding device | 0.012 | 0.038 | 0.040 | 0.011 | 0.024 | 0.011 | 0.021 | 0.021 |
Drilling device | 0.004 | 0.011 | 0.013 | 0.003 | 0.008 | 0.004 | 0.001 | 0.001 |
Protective device | 0.073 | 0.127 | 0.038 | 0.051 | 0.089 | 0.099 | 0.090 | 0.099 |
Cooling system | 0.110 | 0.034 | 0.079 | 0.084 | 0.056 | 0.028 | 0.033 | 0.032 |
Lubrication system | 0.030 | 0.045 | 0.067 | 0.042 | 0.037 | 0.012 | 0.035 | 0.032 |
Other | 0.023 | 0.039 | 0.037 | 0.005 | 0.025 | 0.006 | 0.006 | 0.007 |