The failure analysis method and reliability of the improvement of the reliability of CNC lathes in Yufeng University are in the form of a double 21.2. Big 7 Machinery 1 course College Ji Long Chang 212. Spring City Finance School. The main reason for the low market share of China's domestic CNC machine tools is that the reliability is not up to the requirements. During the period of the nine-year period, the company will set up a 4 fresh bed and analyze the reliability of the products. The introduction of CNC lathes has solved the most rapid production of machinery industry products. Gradually replaced by small and medium-sized production. According to statistics, in the modern machinery industry, small and medium-sized products account for about 7075, the traditional noon. Processing root wood meets the requirements of not 7. CNC lathes are the solution to high quality. The efficient and economical production of small and medium-sized batches of products has been developed. It has become a very important factor in whether I can win the domestic market and enter the international market. This is related to the fire of the machine tool industry in China.
1 Reliability Test Plan Reliability Test Purpose In a broad sense, any product failure is often accompanied by a life test. The susceptibility test, the exposure of the CNC lathe design and manufacturing and assembly, etc. 6 take corresponding measures to eliminate the fault as much as possible to improve the reliability level of the product to collect the reliability of the basic data of the CNC lathe. Statistical methods are applied using appropriate methods. The grammability of the product is determined by the number of cups. From the reliability of the CNC lathe is less than 1 flat and assessment work.
Statistical analysis and fault analysis of the failure phenomenon of CNC lathes, found the reliability of the series of CNC lathes, find out the cause of the failure, propose reliability improvements, and establish corresponding reliability assurance measures.
1.2 Reliability test method According to the research and development of the juice, the design of the CNC car is improved.
Therefore, the test of hydrological test is suitable for reliability. Before the CNC boring machine is shipped from the factory, after the manual function test dry run test and accuracy test, it is necessary to use the CNC boring machine with four kinds of main functions, and carry out the early failure test of the continuous dry run without cutting. The time for continuous air-running test of the whole machine is 72. Because the idle running test time is short, early failures will appear in different forms in the early stage of use by each manufacturer. The wooden test refers to the test that the manufacturer has completed the 721 dry run test, and the soil has been used for one early use.
1.3 The test bed CNC lathe is expensive and its structure is complicated. There are many uncertain factors in the conditions, so the field test method can truly reflect the reliability of the actual use. The reliability of the data in the field test is a key question. The reliability data in the wooden texts are all recorded by the manufacturer. The number of the CNC lathes is a batch of production. It is impossible to conduct all the tests. The sampling method is adopted, the parametric test room method is used, and the 2 CNC lathes are used to analyze the redundant analysis. Find out the failure mode of each fault location of the whole machine and the cause of the failure, and grasp the fault occurrence of this series of CNC lathes as a whole; find out the fault mode and the original analysis that have great influence on the reliability of the whole machine; The friend of the improved design made a fatal analysis to find out the weak links of the series of CNC lathes, find the key components, and provide reliable basis for the reliability distribution and improvement design of the CNC lathe according to the actual situation. Sex research methods and measures. This method gradually matured into a failure mode in the late 1960s and the fatal analysis of the fatal analysis method is a key step in quantifying the consequences of failures. That is, the failure mode is studied according to the severity of each slot mode and the probability of occurrence of the failure mode, so as to comprehensively evaluate the impact of the failure mode. The lethality of the component is a threat to the consequences of the component failure! Comprehensive evaluation of the degree, when the reaction subsystem or the sound component fails, the fatal analysis of the whole machine through the whole machine can obtain the key components that affect the reliability of the series of CNC lathes, and find out the weak links of the research products, so as to be targeted Improve reliability design.
The control lathe is divided into 13 subsystems or components, and the fatality is calculated as the fatality of the deadly parts or subsystems of the CNC lathe parts. The system turret tool system power supply, the main feed system of the shaft feed system and the electrical system of the spindle assembly B Axis feed system shoulder system lubrication system hydraulic system cooling system clamping system overall protection fault tree analysis 3.1 establish the whole machine fault tree fault tree analysis method as follows: 1 build fault tree 2 stand the fault tree math shuttle type 3 Qualitative analysis of system reliability; 4 quantitative analysis of system reliability.
Ding analysis to find ways to improve the reliability level of the research products. In terms of several bodies. In this paper, the purpose of the analysis is as follows (1) Clearly the intrinsic connection and logical relationship of the CNC lathe failure events.
From the top of the pair, the downward analysis is to find out which system parts are related to the state of the component parts. It is comprehensively clarified that the system failure is analyzed by the lower end of the fault tree, and the influence of the component parts failure on the system failure and the propagation path are ascertained.
Comprehensive consideration of environmental conditions, human error software and hardware, etc., to find out the fault spectrum of the whole machine and the weak link of the swim, so that the pickup begins to advance step by step. Write the determined top event CNC trampoline fault in the top rectangular box, which will cause all necessary and sufficient direct cause events of the top event to be placed in the intermediate event symbol to draw the first row and then according to their actual logical relationship in the CNC lathe , the top event and these direct cause events are linked with appropriate logic gate symbols. Follow the rules of building trees and progress downwards until all the lowest cause events are bottom events. After simplifying the initial fault tree and removing the redundant logic events, this paper establishes the fault of the CNC lathe.
3.2 Deterministic Analysis The task of qualitative analysis of fault trees is to determine the unreliability of the probability of occurrence of the top event according to the probability of occurrence of each bottom event, and the ineffectiveness of the repairable system. In addition, analytical calculations of component and cut-off importance should be performed. In the fault tree analysis, it is necessary to find the minimum cut set with repeated events, but these events are statistically independent. Boolean algebra can be used for the logical relationship between events. The fault tree directly using Boolean algebra can be Booleanized. Jane, thus getting the fault tree, after the Boolean algebra. It is the sum of the base event of the basement event and the product of the basic few pieces is called the minimum cut set of the fault tree. That is, the failure mode of the system reflects all the failure modes of the system due to the 1st minimum cut set. Therefore, the total minimum cut set is called the fault spectrum of the system, and the fault spectrum analysis can be used to find out the weak links of the system. In order to have, the targeted improvement of the juice design, reasonable mention! The level of reliability of the system.
In the real direction, the CNC annual bed fault tree can be qualitatively described by the structure function of the formula 4, and it reflects the fault information contained in the fault tree of the whole machine. In addition, according to the structure function, the probability of the component of the fault tree can be determined, and the probability of occurrence of each bottom cow in the eucalyptus tree is calculated to derive the probability of occurrence of the CNC lathe failure. The unreliability of the product, and finally the reliability of the product. During the writing of this thesis, the reliability data for the first year of the Jiuquan Science and Technology Research Project is not very sufficient, and this work cannot be carried out. It can be improved on the basis of accumulating data in the future. I II Tian Weifeng, Jin Zhihua. Reliability technology. Shanghai Jiaotong University Press, 1996, 2535.
Mowbray. Reliability-centered maintenance. Beijing Machinery Industry Press, 1995125 3 Wang Yiqiang. Nine national key scientific and technological research projects special feasibility study report only. Changchun Jilin University of Technology,
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