硬质合金刀具的动态可靠性及失效率研究

发布时间：2018-03-13 22:21

本文选题：刀具　切入点：动态可靠性　出处：《东北大学学报(自然科学版)》2015年06期 　论文类型：期刊论文

【摘要】：分析了硬质合金刀具在断续切削加工时的主要失效形式,考虑了冲击载荷作用次数对刀具可靠性的影响,运用应力-强度干涉模型及随机过程理论,建立了硬质合金刀具的动态可靠性数学模型,给出了刀具在断续切削加工时的可靠度的变化规律.同时建立了以载荷冲击次数及加工时间为度量指标的刀具失效率计算模型.研究表明,随着载荷冲击次数和加工时间的增加,刀具的可靠度曲线出现逐渐降低的变化过程.刀具失效率具有"浴盆"曲线的特征,且与实验结果相吻合.通过该曲线可以准确地划分刀具的早期失效期、偶然失效期和耗损失效期,为刀具选取试验和修复时间以及可靠寿命等指标提供了理论依据.
[Abstract]:In this paper, the main failure modes of cemented carbide cutting tools in intermittent cutting are analyzed. The influence of impact load on tool reliability is considered, and the stress-strength interference model and stochastic process theory are used. The mathematical model of dynamic reliability of cemented carbide cutting tools is established. The variation rule of tool reliability in intermittent cutting is given, and the calculation model of tool failure rate is established, which is measured by load impact times and machining time. With the increase of load impact times and machining time, the curve of tool reliability decreases gradually. The tool failure rate has the characteristic of "bathtub" curve. The curve can be used to accurately divide the early failure period, accidental failure period and wear failure period of the tool, which provides a theoretical basis for selecting the test and repair time and reliable life of the tool.
【作者单位】：东北大学机械工程与自动化学院;
【基金】：国家自然科学基金资助项目(51475086,51305071) 辽宁省自然科学基金资助项目(2014020026) 教育部高等学校博士学科点专项科研基金资助项目(20110042120017)
【分类号】：TG711;TG659

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