Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (2): 280-287.doi: 10.13229/j.cnki.jdxbgxb20211196

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Fault analysis of circular tool magazine based on Bayesian network

Li-ping WANG1(),Bin ZHU1,Jun WU1(),Zi-han TAO2   

  1. 1.Department of Mechanical Engineering，Tsinghua University，Beijing 100084，China
    2.Deda Machinery （Kunshan） Co. ，Ltd. ，Suzhou 215314，China
  • Received:2021-09-23 Online:2022-02-01 Published:2022-02-17
  • Contact: Jun WU E-mail:lpwang@mail.tsinghua.edu.cn;jhwu@mail.tsinghua.edu.cn

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Abstract:

Aiming at multiple types of faults and unknown fault reasons of tool magazine， this paper established a Bayesian network of the circular tool magazine system based on fault tree analysis of the tool magazine. The prior probability and conditional probability of nodes in the Bayesian network are solved by using a batch of fault data. Based on the analysis of node importance of the Bayesian network， it is found that the cutter body motor， the positioning key of ATC and the body of ATC are the weak links in the circular tool magazine. In addition， based on the analysis of the posterior failure rate of the parent node， the failure of tool changing components and tool storage components are the main cause of tool loss in the tool library. If tool loss occurs， the tool arm and cutter head motor should be overhauled first.

Key words: circular tool magazine, Bayesian network, fault analysis, reliability of tool magazine

CLC Number: 

  • TG659

Fig.1

Example of Bayesian network structure"

Fig.2

Working flow chart of the circular tool magazine system"

Fig.3

Fault tree of the circular tool magazine system"

Table 1

Event code"

事件事件名称事件事件名称
W刀库系统故障X12凸轮箱故障
E1刀库主体及防护组件故障X13凸轮箱电机故障
E2储刀组件故障X14刀盘计数接近开关故障
E3推刀组件故障X15刀盘原点接近开关故障
E4换刀组件故障X16倒/回刀接近开关故障
E5传感器组件故障X17刀臂刹车接近开关故障
E6外部配合组件故障X18刀臂扣刀接近开关故障
E7数控组件故障X19刀臂原点接近开关故障
E8润滑系统故障X20主轴移位
X1刀库本体损坏X21数控代码有误
X2防护罩损坏X22润滑不足或油管破裂
X3耐磨片故障T1刀臂本体变形
X4刀盘本体故障T2扣刀爪变形
X5刀盘电机故障T3刀臂定位键磨损
X6减速机故障T4刀臂顶杆故障
X7刀套故障T5刀臂顶杆弹簧断裂
X8气缸故障T6刀臂顶销磨损
X9单向阀故障T7刀臂顶销弹簧断裂
X10电磁阀故障T8刀臂胀紧环盖松动
X11机械爪故障T9刀臂其他锁紧零件故障

Table 2

Failure statistics of circular tool magazine"

模式代码模式名称故障频数故障频率
M1掉刀470.224
M2卡刀270.129
M3刀盘无动作460.219
M4刀臂无动作190.090
M5刀套断裂90.043
M6无法倒回刀80.038
M7乱刀20.010
M8支撑类零部件损坏20.010
M9外罩类零部件损坏30.014
M10气液堵渗漏60.029
M11换刀声音异常410.195

Fig.4

Bayesian network of circular tool magazine system"

Fig.5

Fault mode distribution of circular tool magazine system"

Fig.6

Probabilities of basic event"

Fig.7

Failure of component of circular tool magazine"

Fig.8

Importance of the root node"

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