共查询到18条相似文献，搜索用时 218 毫秒
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韦江波 《柳州职业技术学院学报》2011,11(3):55-58
主要介绍刀具磨损产生的危害,在刀具加工过程中监测刀具磨损变化情况,举例多传感器中电机电流和声发射传感器获取刀具在磨损过程中的准确数据,对刀具的磨损信号进行信息反馈,并及时做出应对处理。 相似文献
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刘苹 《天津职业技术师范学院学报》1997,(2):15-18
刀具磨损的在线监测技术是实现制造系统加工过程自动化的关键技术之一。传统的刀具磨损监测方法是：在单机上，完全由操作根据经验监测；在自动线上大都采用定时换刀的方法。而定时换刀的方法不能对切削过程中发生的超前磨损、破损等特殊事件进行检测和预防。 相似文献
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冯鸿钦 《闽西职业技术学院学报》2010,12(2):103-106
采用CBN超硬刀具和硬质合金刀具进行高速干切削加工钛合金（Ti-6Al-4V）的对比试验。试验结果表明：在高速切削加工钛合金时,CBN刀具的使用寿命远大于硬质合金刀具的使用寿命;CBN刀具的磨损机理也不同于硬质合金刀具的磨损机理,CBN刀具的主要磨损机理是磨粒磨损、粘结磨损、扩散磨损和微小剥落磨损。 相似文献
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采用粉末冶金法试制干式硬态车削用PCBN刀具,并对该刀具的使用性能效果和磨损情况进行分析。结果表明：PCBN刀具制造工艺简单,成型质量好;该类刀具用于HRC〉60硬质钢的干式车削过程平稳,刀具磨损小,所加工的工件质量符合要求;该刀具磨损原因主要是氧化磨损和粘结磨损共同作用的结果。 相似文献
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刀具是切削加工过程中重要的生产要素,其状态影响加工过程和结果。以涂层硬质合金数控外圆车削刀具为研究对象,应用基于声发射的刀具磨损检测系统,监测刀具的磨损状态,分析在切削45钢件过程中对表面粗糙的影响,从而为实际应用提供一定的参考数据。 相似文献
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数控机床刀具磨、破损状态监测对于提高机床加工的利用率以及经济效益具有重要的意义．本文在分析各种监测方法的基本原理、优缺点和应用范围的基础上结合自身的研究指出合理的多信号融合监测是目前在线监测研究的发展方向． 相似文献
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提出了一种用于设备性能退化评估的PCA-CMAC(主成分分析-小脑模型节点控制器)模型.该模型利用PCA进行特征提取,去除多个传感器信号特征的冗余信息,并且减少CMAC的输入维数;利用CMAC的局部泛化能力定量地评估设备的性能退化.给出了模型的实现过程,并将模型应用于钻削过程刀具状态的评估,试验结果证明该模型能基于刀具的正常状态,对刀具的磨损状态进行定量的评估.分析了CMAC中泛化参数g和量化参数r对评估结果的影响,g越大,CMAC的泛化能力越好,但各退化状态之间的区别越不明显;r越小,各退化状态之间越容易区分,但所需的权存储空间越大.2个参数的基本选择原则是CMAC的权存储空间应尽量小,与此同时,各退化状态之间应容易区分. 相似文献
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浅谈刀具磨损与刀具的使用寿命 总被引：2，自引：0，他引：2
杨平 《重庆职业技术学院学报》2005,14(4):64-65
在切削过程中，刀具在高温和高应力的作用下，前刀面与切屑，后刀面与工件间产生强烈磨擦，使刀具磨损。而刀具磨损的快慢程度影响着刀具的使用寿命，本文就刀具的磨损与使用寿命进行探讨。 相似文献
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针对钛合金损伤在役监测需要,提出了采用声发射实时动态监测技术.利用有限元分析方法,通过建立钛合金板结构模型,并对其中不同类型、不同上升时间与不同传导距离的裂纹源开展研究,利用小波方法和频散曲线分析声发射源的特征频率与模态.仿真实验结果表明,在设定适当的上升时间与传导距离时,不同类型的声发射源有着不同的特征频率与模态,根... 相似文献
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FMS环境下刀具磨损寿命预测研究 总被引：4，自引：0，他引：4
续永刚 《石家庄职业技术学院学报》2005,17(6):35-37
在FMS中，刀具磨损、破损的监控技术和寿命管理方式是质量控制系统、刀具管理系统的重要组成部分，对刀具的监控方式进行了综合分析，对其优、缺点进行了比较，并利用数据库技术对刀具的寿命进行了管理预测． 相似文献
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The objective of the present research is to investigate the relationship among tool wear, surface topography, and surface roughness when high-speed end milling Ti-6Al-4V alloy, and also to define an optimal flank wear criterion for the cutting tool to integrate tool life and the surface roughness requirements of the finish milling process. An annealed Ti-6Al-4V alloy was selected as the workpiece material, undergoing end milling with uncoated carbide inserts. The flank wear of the insert was observed and measured with the toolmaker＇s microscope. To examine machined surfaces, 3D surface topography was provided by the white light interferometer, and the arithmetical mean roughness （Ra） was calculated with the WYKO Vision32 software. The flank wear increases with cutting time, and the maximal flank wear is set as the flank wear criterion. As the cutting process progresses, tool wear is the predominant factor affecting the variation of surface roughness. According to the plots for the tool wear propagation and surface roughness variation, an optimal flank wear criterion can be defined which integrates the tool life and the surface roughness requirements for the finish milling process. 相似文献
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数控机床是高度自动化生产设备,要求进行各种连续切削加工。机床在换刀时前一刀具刀尖位置和新换的刀具形状、位置之间会产生差异,刀具安装、刀具磨损和刀尖圆弧半径等方面不尽相同,利用刀具补偿功能予以补偿,可以加工出符合图样要求的零件,简化编程,提高生产工作效率。 相似文献
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In this paper, a series of experiments were performed by high speed milling of Ti-6.5Al-2Zr-1Mo-1V (TA15) by use of polycrystalline diamond (PCD) tools. The characteristics of high speed machining (HSM) dynamic milling forces were investigated. The effects of the parameters of the process, i.e., cutting speed, feed per tooth, and depth of axial cut, on cutting forces were studied. The cutting force signals under different cutting speed conditions and different cutting tool wear stages were analyzed by frequency spectrum analysis. The trend and frequency domain aspects of the dynamic forces were evaluated and discussed. The results indicate that a characteristic frequency in cutting force power spectrum does in fact exist. The amplitudes increase with the increase of cutting speed and tool wear level, which could be applied to the monitoring of the cutting process. 相似文献
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张扬龙 《福建工程学院学报》2014,(3):241-245
对某机床厂的龙门导轨磨床MMA52160A利用铁谱分析技术的油样进行定期检测,及时地掌握龙门导轨磨床的磨损状况。通过实验与分析发现,在检测时间段内导轨磨床内部存在着正常磨损、切削磨损、滚滑复合磨损磨粒以及铁的氧化物,在数量上以正常磨损居多,其它类型磨粒数量较少,可以判断导轨磨床仍处于正常运行状态。 实验表明,铁谱分析技术可以对机床的运行状态进行预报故障;同时,可合理地确定机床的换油周期,节省油料,做到科学润滑,以延长龙门导轨磨床的使用寿命。 相似文献
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Cong-jing REN Jing-dai WANG Di SONG Bin-bo JIANG Zu-wei LIAO Yong-rong YANG 《浙江大学学报(A卷英文版)》2011,12(4):260-267
Particle size distribution (PSD) is an important parameter in the process of fluidization, and it always plays a crucial role
in a gas-solid fluidized system. A PSD model for on-line PSD determination based on acoustic emission (AE) measurement was
developed according to the mechanism of particle collision with the inner wall of the cylinder and multi-scale wavelet decomposition
analysis. This PSD model illuminates the quantitative relationship between the energy percentage of AE signals for different
scales and the PSD, which indicates the feasibility of the application of the PSD model. Experiments were undertaken both
in lab and plant gas-solid fluidized setup with polyethylene particles, and the parameters of the PSD model were calibrated
and revised. The experimental conditions and results proved that the PSD model was suitable for on-line measurement and was
sufficiently sensible and accurate. Concerning agglomeration, the PSD model also showed exact serviceability on detecting
the onset of agglomeration by abnormal PSD, and the result agreed with that from the radiation method. Ultimately, AE measurement
was found to be a reliable and credible means for understanding the PSD information that affects the behavior of a system,
which can provide valuable guidance for practical applications. 相似文献
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