Research On Reliability Key Technique For CNC Puncher

Along with the numerical control puncher's structure more and more complete, the charge pay on maintain, which belongs to domestically numerical control puncher's higher failure rate, seriously affected the domestic and foreign market competition prestige as well as in the modern metaplasia mid-production function, therefore, it is imperative to carries on the alyzes work twords domestical numerical control puncher.The paper collected 12 this series numerical control puncher's failure data, and analyzes them by the method of cut the experiment time on a certain point, the paper analyzed the table of failure position, failure model and failure cause. To go with the needs of research work, link with the data collected earlier, setted up data storage about reliability data.It regatded a large amount of experimental data obtained as the prerequisite, to deal with the data gathered, did the research work about breakdown time interval distributed model that about this series of numerical control puncher, Made out the shape of scattered form, which belongs to experiment data, intend observed value and empirical distribution function sepatately with the probability density function, estimated the distribution type of spacing interval of trouble tentatively. According to thefunction form above, contrasted to various models of typical cruve forms of distributing function, used relevant method to confirm the distribution of function, and estimated the add number, which belongs to the distribute function, did the suppose examinationuse work for the distribute function(mehtord d), finally I worked out time spacing interval trouble distribute function F(t) obey the Weibull distribution, moreover extracted probability density function f(t), as well as reliability function R (t), the expiration rate function. Finally calculated MTBF the observation value, carried on the spot estimate to MTBF. Appraisal average maintenance time MTTR and inherent usebility Ai.Carried on the method of FMECA, to analyse the numerical control puncher's failer. Looked up the ratio of every parts of failer, and failer pattern, failer reason, from the whole situation to grasped this serie of numerical control puncher's failer. Discovered the bigger failer pattern affected the entire machine's reliability; thoroughly carried on the analyse work to frequent failer part and failer pattern and the failer reason about the subsystem, Inquires the design direction about the reliable improvement.According to analyze FMECA of this text, drawede the following conclusion, the most frequent position of trouble is the mould, the most frequent trouble mode is damage of part, the most frequent trouble reason division is assembly and adjustment, the mould has the highest endangered degree, which is a key part influences the reliability of numerical control puncher, the next coming in order...