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Study on Technlogy for Reliability Allocation of CNC Lathe Based on Correlation

Author: HeYu
Tutor: ShenGuiXiang
School: Jilin University
Course: Industrial Engineering
Keywords: CNC lathe Reliability Allocation Fault correlation Reliability Impact Copula
CLC: TG519.1
Type: Master's thesis
Year: 2011
Downloads: 187
Quote: 0
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Abstract


CNC technology and equipment development of emerging high-tech industries, and state-of-the-art industrial equipment, enabling technology and the basic level of reliability is the status of a national strategy and a manifestation of the comprehensive national strength. The reliability of the assigned work is an important part in the reliability design, the product inherent reliability strong guarantee. The high level of CNC equipment and complicated to decide the necessity and urgency of achieving reasonable and effective reliability allocation. Papers to a series of CNC lathes, first collecting field failure information, divided according to the structural features of CNC lathes and work process subsystem. Introduction of the correlation theory, including the structure of correlation, fault and maintenance evaluation correlation index calculation of reliability modeling, reliability degree of influence, failure analysis, maintenance evaluation aspects of the reliability of the distribution of CNC lathes. The papers from the subsystem affect the reliability of the machine is the degree of impact between systems, maintainability, complexity, manufacturing technology, working conditions, cost and other aspects to establish the the CNC lathes reliability allocation criteria. Minitab software applied first to establish the reliability model of the whole subsystem reliability degree of influence based on the concept of the establishment of the subsystems and the whole reliability of static, dynamic impact and dynamic core influences model to quantitatively annihilator the impact system relative reliability of the machine and Entropy Method gives each impact index of the weight, and then calculate the combined effects of the subsystems of the machine's reliability degrees. Second, analysis of the CNC lathes failure mechanism to identify associated failure, to build CNC lathe associated fault matrix, combined with the the subsystem failure frequency information to establish the model of the impact between the subsystems, quantitative subsystems in the case of related faults. Third, the analysis of the maintenance of the subsystems. First, determine the maintainability evaluation, analysis of the correlation between each index factors, and then develop quantitative criteria of the maintainability index factors, application maintainability-based evaluation the CNC lathe subsystem maintainability evaluation model to establish the causal graph theory Finally, the correlation matrix with Permanent function of the maintainability maintainability index of each subsystem. Fourth, other factors that affect the reliability allocation: the complexity of the manufacturing technology, working conditions and cost analysis, the latter three factors, with the knowledge of experts in the field to expand the calculation, each subsystem manufacturing technology, working conditions, and cost quantified. Then the TOPSIS method (approaching the ideal solution for ordinal preference) of each subsystem Sort, the evaluation index weight through the information entropy strike and sort the results as a basis for reliability allocation. Finally, the introduction of the Copula function to establish the reliability allocation model for CNC lathes Computing Matlab software, to be allocated to each subsystem reliability range and mean time between failures range, CNC lathes reliability allocation.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Turning and lathe ( lathe ) > Program control lathes and CNC lathes
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