曲轴磨连杆夹具的改进设计

针对M8263曲轴磨床磨连杆夹具在加工中存在的问题,对其进行了改进设计,使其达到较高的相位角加工精度,尤其是夹具的分度方式更有独到之处.实践证明,满足了公司多品种加工、生产率高的要求,具有一定的参考价值.     

现代磨削加工技术的发展

介绍了现代磨削加工技术的发展概况及关键技术．展望磨削加工技术发展趋势.     

平面高效滚切磨削精密加工技术

论述平面高效滚切磨削精密加工技术的基本原理；分析滚切刀具与普通刀具的本质区别及适宜高速切削的依据;指明高效滚切磨削加工技术的优越性．     

离心式研磨机的结构改进设计

分析了离心式研磨机存在的一些问题，对其研磨齿磨损问题、主轴组件的集成问题、动轮与定轮间间隙调整等问题进行结构设计，对改进机器性能及提高产量具有重要意义。     

低碳马氏体不锈钢0Cr13Ni4Mo磨削表层屈服强度的研究

借助X射线应力分析技术测量了屈服强度在马氏体不锈钢0Cr13Ni4Mo磨削影响层上的分布,同时测量或计算了残余应力、X射线衍射线半高宽、显微硬度、嵌镶块尺寸、微观应变和位错密度等参量的沿层深分布。结果表明,该影响层的屈服强度大幅度提高了,与用半高宽和显微硬度比较起来,用屈服强度作指标能够更好地反映磨削影响层的强化。磨削表面的条件屈服强度提高了约50%,嵌镶块尺寸从约64nm减小到约28nm,微观应变从约7×10-4增高至约14×10-4。磨削影响层的条件屈服强度σ0.2与位错密度的平方根之间存在线性关系。这些结果说明,磨削表面发生了严重的塑性形变。冷作塑性形变强化是磨削影响层的屈服强度得以提高的根本原因。     

数控凸轮轴磨床的研制及实际加工研究

介绍凸轮轮廓磨削加工的数学模型及研制的数控凸轮轴磨床的机械结构,进行加工实验并讨论凸轮轴磨削的工艺参数。     

GLEASON PHOENIX ⅡCNC磨齿机B轴运动分析

介绍了格里森PHOENIXⅡ数控螺旋锥齿轮磨齿机的主要特点 ,对其B轴运动进行建模及运动分析 ,为该类机床的结构设计提供了理论依据。     

Optimized laser processing of calibration blocks for grinding burn detection with Barkhausen noise

Calibration samples for the Barkhausen noise (BN) method were produced with laser processing. A planet gear wheel used for production quality control was subjected to laser irradiation to verify the BN sensor output. Different samples were found to respond similarly to the laser processing although the laser parameters needed to be adjusted for different surface qualities separately. The surface optimization for laser processing was studied with different surface qualities of samples. The ground surface was compared with a sandblasted and vibratory ground surface. The ground and sandblasted surfaces were both amenable to the laser processing whereas the vibratory grinding process created inhomogeneous surfaces for laser beam absorption. Laser processing was found to produce uniform changes in the residual stress values in two perpendicular measuring directions. The root mean square value of the BN voltage signal exhibited linear correlations with the values of the residual stress and surface hardness.     

夹持工件打磨机器人离线编程及仿真系统设计

打磨加工对机器人运动轨迹精度要求很高。针对常规的在线示教编程不能满足打磨加工精度的问题,以Visual C++为开发平台,基于MFC框架以及OpenGL图形库接口搭建机器人离线编程仿真系统,实现机器人离线示教、程序编辑、建立轨迹目标点数据库等功能。通过基于工件模型STL文件分层切片生成机器人运动轨迹的方法,求得交点的姿态并得到机器人加工轨迹位姿的齐次矩阵,最后将获得的机器人打磨轨迹参数导入离线编程系统中,编程实现机器人打磨加工的可视化仿真。     

Identification of the grinding mechanisms and their origin in a stirred ball mill using population balances

The objective of this work was to understand the origin of the stresses and the nature of the grinding mechanisms in a high-shear ball mill. The ball mill used was a Dynomill and the grinding media consisted of zirconium oxide beads. The ground powder was a poorly water soluble product. The particle size distribution was analyzed with laser diffraction.A population balance model enabled to calculate the breakage function from the experimental data. The breaking parameters were used to determine the grinding mechanism at different grinding conditions. The grinding mechanism depends on the orientation and intensity of the forces applied on the particles. The grinding mechanisms were determined from the grinding experiments and correlated to the movement of the grinding media in the grinding chamber and the applied mechanical stresses.The observed grinding mechanisms are cleavage and some fracture for coarse particles , cleavage and abrasion for intermediate particles and cleavage for fine particles (smaller than ).The grinding mechanisms are related to the movement of the grinding media in the grinding chamber. Cleavage and abrasion of particles are the result of compression forces and shear in the centrifuged packed bed of grinding beads. The grinding mechanism does not change when changing the operating conditions and the packed bed of media is similar in the studied ranges of operating conditions.