基于载荷谱的加工中心ATC系统加速寿命试验

发布时间：2018-03-29 06:21

本文选题：加工中心　切入点：ATC系统　出处：《吉林大学》2017年硕士论文

【摘要】：随着现代制造业的不断发展,加工中心因其刀具自动更换及多工序自动加工的独特优势被应用到了制造业的方方面面。与此同时,加工中心的可靠性也成为了制约其生产效率的一个重要指标。自动换刀系统(Automatic Tool Changing System,简称ATC系统)作为加工中心的一个关键而又故障频发的功能部件,对其进行可靠性研究显得尤为重要。目前,由于缺乏准确的载荷谱,在实验室内无法进行模拟真实工况的可靠性试验,更不能进行合理的加速寿命试验。针对这个问题,本文提出了一种基于载荷谱的加工中心ATC系统加速寿命试验方法。本文的主要研究工作如下:1)为了编制ATC系统的载荷谱,本文制定了ATC系统的现场数据采集规范,并通过专人驻厂的方法,对实际工况下的数据进行采集。对所采集的数据进行处理,建立实际工况下ATC系统的可靠性模型并得出可靠性指标,以及每把刀具的换刀次数和每个刀库的总体换刀次数,为后续载荷谱的编制及可靠性加速试验提供基础。2)通过分布模型初选,模型参数求解及模型优选三个步骤编制了单把刀具重量谱以及刀库插刀总重谱,并运用Copula函数建立了单把刀具重量和刀库插刀总重联合的二维载荷谱。3)以换刀频率为加速应力,制定了ATC系统的可靠性加速寿命试验方案。为了确定加速应力的阈值并实现自定义换刀功能,搭建了电机温度采集系统,并改进了现有的试验台控制系统。根据所编制的载荷谱建立了程序加载谱,为试验提供了加载方案。4)对试验数据进行了处理。根据对不同应力水平下的MTBF,建立了ATC系统可靠性加速试验的加速模型,并用正常应力水平下的MTBF对该模型进行了验证,求出了各加速应力水平下的加速因子。
[Abstract]:With the development of modern manufacturing industry, machining center has been applied to every aspect of the manufacturing sector because of the unique advantage of the automatic replacement and multi procedure automatic processing tools. At the same time, the reliability of the machining center has become an important index to restrict the production efficiency. Automatic toolchange system (Automatic Tool Changing System, referred to as ATC system) function as a key component and fault processing center frequency, the reliability research is particularly important. At present, due to the lack of accurate load spectrum, to simulate the real conditions of the reliability test in the laboratory, not for accelerated life test is reasonable. To solve this problem, this paper puts forward a method of accelerated life test system of ATC machining center based on load spectrum. The main research work of this paper is as follows: 1) to load the ATC system for the spectrum. The development of the field data acquisition specification of ATC system, and through the method of personal mill, to collect the actual conditions of the data processing of the collected data, establish the reliability model of ATC system under practical conditions and get the reliability index, and overall each tool tool change times and each of the knife switch frequency of cutter, preparation and reliability for the subsequent load spectrum acceleration test provides the basis.2) through distribution model primaries, model parameters and model selection of three steps for single knife and knife knife spectrum weight weight spectrum, and use the Copula function to load a single 2D knife knife tool weight and weight the joint spectrum of.3) to change the knife frequency of accelerated stress, make the reliability of the ATC system of accelerated life test plan. In order to determine the accelerated stress threshold and the realization of ATC function custom built motor The temperature acquisition system, and improved the existing test stand control system. According to the program load spectrum to establish the compiled load spectrum, provides the loading scheme.4 as test) of test data was processed. According to the different stress level of MTBF, established the model of ATC system reliability and accelerated speed test, and with the stress level of the MTBF to validate the model, obtained the acceleration factor should be accelerated stress level.

【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG659

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