Application in fault diagnosis of CNC automatic fiber laser cutting machine

Taking CO: CNC automatic fiber laser cutting machine as the analysis object, using the fault tree analysis method to create a fault tree model of the CNC automatic fiber laser cutting machine with 'cutting workpiece abnormal' as the top event, verifying the fault through actual cases The correctness and effectiveness of the tree model, the use of fault tree analysis can improve the accuracy of fault location and the efficiency of fault maintenance. The CNC fully automatic fiber laser cutting machine is a kind of equipment that uses the heat energy of the laser beam to achieve sheet cutting. The CNC automatic fiber laser cutting machine is composed of a CNC system, a servo drive device, a machine tool part, a laser part and auxiliary equipment. It is an integrated equipment that integrates light, machinery and electricity. The CNC automatic fiber laser cutting machine has high cutting accuracy and cutting efficiency. High, plus T. Low cost, widely used in various industries in modern manufacturing' in actual production. Once the CNC automatic fiber laser cutting machine fails and is not repaired in time, it will often cause huge economic losses. Using fault tree analysis The method is used to analyze the fault of the CNC laser cutting machine. It is possible to diagnose and formulate the maintenance plan in advance

The fault tree analysis method FTA (fault tree analysis, fault tree analysis) is a method to eliminate the undesired faults of the system. As the top event, from I: down, the analysis method of looking for various factors that may cause the top event in a tree-like refinement is called the fault tree to express through a logical block diagram, which includes the top event, the intermediate event and the bottom event. They are connected by logic gate relationships such as OR gate, AND gate, NOT OR gate to form a fault tree, which expresses the various fault causes that caused the top event. The fault tree analysis method is often used in system fault analysis, prediction and diagnosis. , Can be divided into qualitative analysis and quantitative analysis. This article mainly analyzes the qualitative analysis of CNC laser and cutting machines. The fault tree analysis of CNC automatic fiber laser cutting machine. The determination of the fault tree at all levels is based on a CNC automatic fiber laser cutting machine. As the object of analysis, it is mainly composed of CO: laser, machine tool, servo drive device, numerical control system, chiller, gas system and dust removal system. CNC automatic fiber laser cutting machine is a highly complex combination of light, machine and electricity Automation system. There are many forms of failure, and the key to establishing the fault tree of CNC automatic fiber laser cutting machine is to determine the top event. The top event is directly related to the final analysis result. The focus of the fault tree analysis is called automatic CNC The fiber laser cutting machine performs fault tree analysis to determine the top and middle events of the fault tree of the CNC automatic fiber laser cutting machine. Priority is given to the faults that have a greater impact on the CNC automatic fiber laser cutting machine. After the analysis, the CNC automatic fiber laser The fault data of the cutting machine over the years is finally selected as the top event of the fault tree. The fault analysis of the top event of the top event is mainly from CO, laser, external optical path, machine tool and process parameters, and finally determines its secondary The events are mainly divided into 4 faults: laser failure, external optical path abnormality, machine motion failure, and abnormal process parameter setting. Each secondary event is further analyzed according to the fault data and functional attributes. The final result The complete fault tree of the automatic fiber laser cutting machine.

The fault tree of CNC automatic fiber laser cutting machine is established. CO: The laser is mainly composed of a laser generator and a laser controller. In addition, it also includes auxiliary equipment such as a water cooler and a nitrogen cylinder group. C0] The most common faults of the laser The laser does not emit light, the laser energy is low, and the laser controller malfunctions. Among them, the first two malfunctions are the most common. In addition, due to the precision and complexity of the CO: laser, the various causes of malfunctions, combined with equipment, structure, and Some failure cases. Three types of failure trees are obtained after analysis. The outer optical path mainly transmits the laser light emitted by the CO: laser to the surface of the cutting workpiece to achieve the purpose of cutting the workpiece. Usually, when the cutting workpiece is abnormal, the first point of failure to check is the outer optical path. The failure of the outer optical path is mainly the abnormal laser focus. Abnormal nitrogen supply and cooling system