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Typical Fault Modeling and Model Analysis of Ordinary Lathes Liu Wenyan1, Zhang Xuewen2(1Jilin Institute of Chemical Technology, Jilin 132022, China 2 2 College of Engineering, Beihua University, Jilin 132022, China) The basis for the management and maintenance of sound management and the reliability and safety design of new lathes Data and basis, the establishment of a good lathe fault, the safety of the lathe, the mechanical fault diagnosis of the lathe is a comprehensive edge science that was developed and developed in the 1960s. With the rapid development of high-speed, high-energy, large-scale, automated, continuous and integrated modern equipment, once equipment fails and is not discovered and eliminated in time, it will bring immeasurable losses. Typical fault modeling and pattern analysis of machine tools have considerable practical value for use and maintenance. They can provide basic data and data for equipment predictive maintenance, provide a simple and fast collision method for fault diagnosis and prevention, and scientific management of equipment. It is of great significance to reduce maintenance costs and improve the reliability and maintainability of equipment.
1 Typical fault modeling of ordinary lathes Modern fault diagnosis techniques mainly include fault tree analysis (Tta), event tree analysis (ETA), pattern recognition and fuzzy diagnosis. Fault tree analysis is an important diagnostic method with strong scientific and in-depth analysis system. It is an analysis method that represents the basic causes of system failures and the ways of influence based on a tree-like logic diagram.
Through analysis, the typical faults of the CA6140 ordinary lathe are divided into five categories: accuracy, fault G, surface roughness, fault +2, drive lubrication, fault +3, electrical fault, +4, special fault, +5) 34 fault types. Cylindricity is out of tolerance, 1, degree is out of tolerance, 2, end face flatness is out of tolerance, 3, ..., no feed motion or speed is lower than the indication number of the sign, 34), 89 basic fault causes live axis center line guide rail The parallelism error in the horizontal plane -1, the parallelism error of the spindle centerline to the guide rail in the vertical plane -2, ..., the motor cover hole is too large -89).
2 Analysis of typical failure mode of ordinary lathe According to the previous fault tree modeling of CA6140 common lathe, the failures of five aspects affecting the performance of CA6140 lathe are analyzed one by one: 2.1 The minimum diameter set that affects the column error in accuracy: i 3 Analysis of the example In order to ensure the safety and reliability of the 50-ton road transport vehicle, it is necessary to carry out reliability design on the rear axle housing. The mean and standard deviation of the inner diameter of the dangerous section inside and outside the axle housing are = (120, 0.6) mm. Xiubao's dimensions are 27.5) MPa dangerous section bending moments are: 4 Conclusions The Bayesian statistics based automotive drive axle housing reliability design review and analysis of the drive axle shell force and traditional reliability design. On the basis of the traditional method, in order to achieve the reliability of the drive axle, the Bayesian statistical posterior expectation method is simplified. The symbolic transformation and the Newton-Raphson iterative method are used to obtain the numerical solution (convergence speed). Very fast) and verified by examples. The method overcomes the conservativeness of the traditional method and makes the design more reasonable.
Other related experiments also verified the feasibility of the method. This method is especially suitable for the individualized and specialized design that is not suitable for classical statistical methods. It can be changed frequently and poorly. The experimental and field data can get a more accurate solution than the traditional method.
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