再制造铲运机传动轴寿命预测研究

发布时间：2018-02-16 18:53

本文关键词： 再制造传动轴临界平面法有限元分析修正系数寿命预测　出处：《兰州理工大学》2012年硕士论文　论文类型：学位论文

【摘要】：由于能源日渐趋于紧张、气候环境恶化的影响，低碳、环保、节能减排成为世界关注的话题。全球倡导低碳节能，我国承诺到2020年单位国内生产总值二氧化碳排放比2005年下降40％至45％。随着工业化、城镇化步伐的加快，伴随铁矿石价格上涨、人口众多、经济发展水平较低等实际现状，我国要达到这一减排目标面临着巨大的压力和挑战。但也正是这样的硬性约束指标，推动了我国再制造行业的加速发展，促进我国循环经济健康有序的可持续发展。作为再生资源利用的一种高级形式，再制造为发展循环经济、推动节能减排创造了条件，推动了机械行业的可持续发展。再制造产品能否满足下一个生命周期的使用，直接决定了再制造本身的价值及意义。因此再制造零、部件的寿命预测成为整个再制造工程中的一项技术难题。针对这一难题，本文围绕再制造铲运机传动轴寿命评估展开研究：本文利用PRO/E软件下建立传动轴三维模型，在ANSYS软件Workbench环境下对该轴进行弹塑性有限元分析，获得危险部位的应力应变数据，再以坐标变换原理建立并确定铲运机传动轴的临界平面及临界平面上关键损伤参量。根据升降法疲劳试验结果，研究了材料42CrMo及其具有3Crl3电弧喷涂涂层的传动轴疲劳行为（不同涂层厚度下传动轴的扭转疲劳极限），并提出采用修正系数来对高速电弧喷涂修复的再制造传动轴实现寿命预测；主要以临界平面法中的Brown-Miller多轴疲劳模型为例，采用修正系数对多轴疲劳模型改造，最后结合多轴疲劳参数、各损伤参量，在几种多轴疲劳模型下对传动轴新品和再制造传动轴分别进行寿命预测和分析。在国内外对再制造和多轴疲劳研究现状的基础上，本文对热喷涂技术处理的再制造铲运机传动轴进行寿命预测。以喷涂后零件疲劳极限为基础，，研究并提出了一种经修正系数改造多轴疲劳模型的方法。该修正法适用于各种“加材料”方法得到的再制造产品的寿命预测。同时为如何判断该类再制造零、部件的疲劳寿命提供了可靠的理论数据支持。
[Abstract]:Because of the increasingly tense energy sources, the impact of the deterioration of the climate environment, low carbon, environmental protection, energy conservation and emission reduction has become a topic of concern in the world. China has promised to reduce its carbon dioxide emissions per unit of GDP by 40% to 45 percent by 2020 compared with 2005. With the acceleration of industrialization and urbanization, with the price of iron ore rising, China has a large population and a low level of economic development. China is facing great pressure and challenge to achieve this emission reduction target. However, it is precisely this kind of rigid constraint index that has promoted the accelerated development of China's remanufacturing industry. As an advanced form of utilization of renewable resources, remanufacturing has created conditions for the development of circular economy, energy saving and emission reduction, and promoted the sustainable development of machinery industry. Whether the remanufacturing product can satisfy the use of the next life cycle directly determines the value and significance of the remanufacturing itself. This paper focuses on the life evaluation of the transmission shaft of the remanufacturing LHD. In this paper, the three-dimensional model of transmission shaft is established by using PRO/E software. The elastic-plastic finite element analysis of the shaft is carried out under the environment of ANSYS software Workbench, and the stress-strain data of dangerous parts are obtained. Then the critical plane and critical damage parameters of the shaft of the scraper are established and determined by the coordinate transformation principle. According to the fatigue test results of the lifting method, The fatigue behavior of 42CrMo and its transmission shaft with 3Crl3 arc spraying coating was studied. The torsional fatigue limit of transmission shaft with different coating thickness was studied. The correction coefficient was proposed to predict the life of remanufactured transmission shaft repaired by high speed arc spraying. Taking the Brown-Miller multiaxial fatigue model in the critical plane method as an example, the modified coefficient is adopted to modify the multiaxial fatigue model. Finally, the damage parameters are combined with the multiaxial fatigue parameters. Life prediction and analysis of new and remanufactured drive shafts are carried out under several multiaxial fatigue models. On the basis of the research status of remanufacturing and multiaxial fatigue at home and abroad, this paper predicts the life of the driving shaft of the remanufacturing scraper treated by thermal spraying technology, which is based on the fatigue limit of the sprayed parts. This paper studies and proposes a modified method for modifying the multiaxial fatigue model. The modified method is applicable to the life prediction of the remanufactured products obtained by various "adding materials" methods. At the same time, how to judge the remanufacturing zero of this kind of products is proposed. The fatigue life of components provides reliable theoretical data support.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.2

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