共查询到20条相似文献,搜索用时 140 毫秒
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基于钻削工步质量波动与监测信号特征变化之间的耦合现象,提出一种基于监测信号双谱特征的高精度批量钻削工步质量一致性控制检测方法。认为正常钻削过程的声发射和三向加速度振动监测信号可视为随机过程,满足或近似高斯分布,信号偏离高斯分布的程度与各钻孔加工质量波动间存在对应关系;以各钻孔声发射和加速度振动监测信号为研究对象,提取各钻孔监测信号的双谱幅值平均值为特征,对不同钻削情况下信号偏离高斯分布的程度进行定量分析;采用基于Relief F算法的特征加权模糊聚类分析,进行基于监测信号双谱幅值均值特征矩阵的钻孔质量分类,并与人工检测的工步质量一致性结果对比分析。计算和分析结果表明,监测信号双谱特征与各钻削工步质量之间存在有机联系,对信号双谱特征进行融合聚类可分析批量钻削工步质量的一致性。 相似文献
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基于振动信号过程特征的批量钻削工序质量检测 总被引:1,自引:0,他引:1
为实现批量钻削质量的快速检测分析,采用振动传感器监控钻削过程,提出一种基于振动信号处理的批量钻削质量监测分析方法.基于钻刃与工件接触位置变化状况,在钻削过程中提炼出与钻削加工质量密切相关的三个阶段:引钻、钻孔和出钻三阶段.采用正交包络法求解振动信号的瞬时频率及瞬时幅值,定位这三个阶段初始时刻的瞬态时间点.利用这些瞬态时间点对振动信号进行分割,获得与每一个钻削过程中引钻、钻孔和出钻三阶段对应的钻削过程振动信号数据.采用主成分分析方法,综合此三个阶段内振动信号的统计特征对批量钻孔质量分布进行分析.计算和分析结果证明,可在3%的误差内提取瞬态特征点,分析和评估批量钻削质量准确度高. 相似文献
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《机械工程师》2018,(12)
通过啄钻方式可以实现利用普通麻花钻进行深孔加工,但由于增加了反复进退刀和冷却时间,导致加工时间变长,生产效率较低,因此研究如何提高啄钻加工效率对大批量生产具有重要意义。文中根据深孔啄钻的基本原理,以传热学基本理论为基础,研究啄钻效率与单次冷却时间的关系,推导出计算公式。通过数值分析,发现随着单次冷却时间的延长,啄钻效率先升高后降低,存在一最佳效率;随着孔深和孔径的增加,啄钻效率降低;啄钻过程中,钻头冷却的温度降幅并非越大越好,可以通过控制单次冷却时间来合理控制温度降幅,并由此确定最佳钻削次数。研究成果为啄钻加工技术能更合理运用于实际生产中提供理论依据。 相似文献
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深孔枪钻加工中的颤振问题,严重地影响了产品的加工质量和机床的效率。以钛合金小直径深孔的枪钻加工为研究对象,从实验研究、理论分析、颤振预测、振动加工等几个方面,对目前小直径深孔枪钻加工技术进行分析,为后续的枪钻深孔加工钻削稳定性与振动加工技术的基础研究提供理论依据。 相似文献
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深孔超声圆周振动钻削初探 总被引:1,自引:0,他引:1
针对深孔加工难度大的特点,采用超声圆周振动加工技术,在普通车床上附加一套振动装置。试验加工了几种不同材料,不同孔径的深孔,取得了较理想的效果,为进一步研究和推广深孔超声圆周振动加工技术提供了可靠的依据。 相似文献
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小孔的振动钻削与普通钻削的比较 总被引:3,自引:0,他引:3
本研究用特殊的万向联轴器作为振动源,进行了钻孔个数、加工精度、深孔加工适用性等方面的试验,获得了较好的效果,证明了这种振动钻孔方注对小孔加工的适用性. 相似文献
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Tauseef Aized Muhammad Amjad 《The International Journal of Advanced Manufacturing Technology》2013,69(9-12):2493-2503
Deep-hole drilling is a relatively complex drilling production process due to the high-hole diameter to length ratio which makes the tool shaft prone to vibration and results typically in low-quality holes from geometry and surface finish viewpoints. This study is aimed at investigating deep-hole drilling process for AISI D2 material taking into account different process input parameters. The hole quality is studied and improved using a response surface-based design of an experiment technique which resulted in a better hole quality. 相似文献
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Gwo-Lianq Chern Han-Jou Lee 《The International Journal of Advanced Manufacturing Technology》2006,27(7-8):688-692
The purpose of this paper is to investigate the effects of assisted vibration on the drilling quality of aluminium alloy (Al
6061-T6) and structure steel (SS41). In the past, research methodology of vibration drilling on small-diameter holes has mainly
involved vibrating from the spindle side. In this paper, a new approach to obtain the desired vibration is proposed from the
workpiece side, by a self-made, vibrating worktable. Through extensive experiments with a twist drill size of 0.5 mm, we found
that hole oversize, displacement of the hole centre, and surface roughness of the drilled wall could be improved with the
increase of vibrating frequency and amplitude. Roundness of the drilled hole could also be improved when high amplitude and
proper frequency are imposed. 相似文献
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In aeronautical industry, stringent requirements relate to the quality of drilled holes in carbon fiber reinforced plastic (CFRP) composite laminates as low hole quality determines poor assembly tolerance, structural properties reduction, and risk for long-term part performance. Non-destructive quality control techniques were applied to drilled CFRP laminate stacks for aeronautical applications to characterize the material damage induced by drilling in order to assess the hole quality for product acceptability. Experimental metrology procedures, including optical measurements and ultrasonic non-destructive evaluation, were employed to appraise both external and internal induced material damage in holes machined under diverse drilling conditions. The optical inspection procedure, comparable to the visual inspection method regularly utilized in industry, provided delaminated area evaluations that are underestimated in the case of severe drilling conditions by up to 7% for hole exit and up to 5% for hole entry. In the case of less severe drilling conditions, the underestimation was limited to <2.5% for both hole exit and hole entry, which can be considered a practically negligible disparity. 相似文献