曲轴箱半精镗缸孔并倒角组合机床的设计

分析曲轴箱加工生产线及半精镗加工工艺和要求,针对过去加工工艺的不足及满足不了曲轴箱半精镗加工刚性、精度、效率的要求,改进半精镗加工工艺方法,设计开发一种先进的加工机床,并从机械、电气、液压等几个方面简要介绍其工作原理、主要结构和关键技术。     

数控镗刀磨损与破损的声发射监测法

通过分析声发射传感器采集的刀具磨损状态信号,提取出反映刀具磨损状态的特征向量MFCC系数及差分系数,然后利用隐马尔可夫模型进行信号处理,建立了检测镗刀刀具状态的监测系统。实验结果表明:在刀具的正常磨损阶段,该监测系统可以实现刀具大致磨损量的预报;在刀具破损或损坏情况下,能够及时监测和预报刀具损坏状态。这种监测方法可用于实时在线监测,为刀具的磨损监测提供了一条切实可行的途径。     

通孔加工刀具的探讨

通孔刀具的设计应用特别讲究,不同的设计方案对加工成本、质量的控制的影响非常大.根据孔径的大小,设计不同结构的刀具,减少刀具数量,使加工成本降到最低.     

发动机缸体曲轴孔加工专用镗床设计

对发动机缸体曲轴孔加工工艺进行了分析,并对专用机床整体方案以及专用夹具结构、刀具结构、主运动传动等机床关键设计技术进行了介绍.发动机缸体曲轴孔精加工专用机床的成功研制并投入使用,为企业带来显著的经济效益,也为同类专用机床的研发提供了良好借鉴.     

APPLICATION OF OXLEY MACHINING THEORY TO BORING AND REAMING

The Oxley machining theory which allows for the high strain-rate/high temperature flow stress and thermal properties of the work materials has so far mainly being applied for predicting forces, etc. in turning. This paper describes recent work that involves extending the above theory for making machining predictions for an internal operation (boring) and intermittent process (reaming). In addition to the comparisons made between predicted and experimental (boring test) results comparisons were also made between experimental boring and turning forces. The latter results show that, under identical conditions, forces in turning are slightly higher than those in boring with the predicted and experimental results showing good agreement. For reaming, the comparison of the predicted and experimental cutting torque and thrust results also show good agreement with the correct trends being predicted when the Oxley machining theory is used with certain simplifying assumptions. The Oxley machining theory which is based on continuum mechanics and variable material flow stress can successfully be used to predict machining parameters for different material removal processes.     

内燃机铝活塞精镗销孔加工方式改进及应用

精镗销孔工序是活塞加工过程中的重要质量控制点,加工质量对活塞的性能有很大影响,压缩高和销孔直径是本工序的关键特性尺寸,本文主要介绍对精镗销孔工序夹具的改进和采用销孔温度控制方法,使精镗销孔的工序能力显著提高。     

APPLICATION OF OXLEY MACHINING THEORY TO BORING AND REAMING

The Oxley machining theory which allows for the high strain-rate/high temperature flow stress and thermal properties of the work materials has so far mainly being applied for predicting forces, etc. in turning. This paper describes recent work that involves extending the above theory for making machining predictions for an internal operation (boring) and intermittent process (reaming). In addition to the comparisons made between predicted and experimental (boring test) results comparisons were also made between experimental boring and turning forces. The latter results show that, under identical conditions, forces in turning are slightly higher than those in boring with the predicted and experimental results showing good agreement. For reaming, the comparison of the predicted and experimental cutting torque and thrust results also show good agreement with the correct trends being predicted when the Oxley machining theory is used with certain simplifying assumptions. The Oxley machining theory which is based on continuum mechanics and variable material flow stress can successfully be used to predict machining parameters for different material removal processes.     

自动补偿镗刀杆国产化及其改进

介绍自动补偿镗刀杆制造中的关键工艺方法，用自动检测自动补偿系统中刀尖磨损和补偿量的循环动态曲线来分析标准结构镗刀杆不能满足同时加工两个长度不同孔的性能要求的原因，以及采取的改进措施和改进后的效果，其中用刀尖径向补偿时的计算计算公式推出了改进镗刀杆的两个调整斜角的数值。     

机夹刚性镗铰刀的设计与使用

介绍了机夹刚性镗铰刀的设计方法，及其使用中应注意的问题。并提供了大量的实践数据供使用者参考，为镗铰刀的设计和使用提供方便。     

镗杆与镗套烧结原因分析及预防措施

详细分析了镗杆与镗套烧结的原因,并有针对性的提出了多种防止烧结的措施,采取这些措施后可避免烧结的各种诱因发生,是解决镗杆和镗套易"烧结"问题的有效方法.