Design and development of a five-axis machine tool with high accuracy,stiffness and efficiency for aero-engine casing manufacturing

In order to satisfy the machining requirements of aero-engine casing in modern aviation industry, this paper investigates three main issues during the design and development process of a five-axis machine tool with high accuracy, stiffness and efficiency, including whole structure design,key components design, and supporting stiffness design. First, an appropriate structure of five-axis machine tool is determined considering the processing characteristics of aero-engine casing. Then, a dual drive swing head and a compact motorized spindle are designed with enough drive capability and stiffness, and related structure, assembly method, cooling technology, and performance simulation are given in detail. Next, a design method of supporting stiffness of guide is proposed through the deformation prediction of the spindle end. Based on above work, a prototype of machine tool is developed, and some experiments are carried out, including performance tests of swing head and motorized spindle, and machining of a simulated workpiece of aero-engine casing. All experimental results show that the machine tool has satisfactory accuracy, stiffness and efficiency, which meets the machining requirements of aero-engine casing. The main work can be used as references for engineers and technicians, which are meaningful in practice.

基于UG的双转台五轴联动数控机床编程及操作

机床是一个国家制造业水平的象征,而代表机床制造业最高境界的是五轴联动数控机床系统,从某种意义上说,它反映了一个国家的工业发展水平状况。五轴联动加工中心具有高效率、高精度的特点,工件一次装夹就可完成五面体的加工。其不但可以对复杂的空间曲面进行高精度加工,更能够适应像汽车零部件、飞机结构件等现代模具的加工。以双转台五轴联动数控机床配合UG软件完成立体人物头像为例,详细讲解了五轴联动机床的编程与操作的全过程。

基于机器视觉的五轴点胶机工件定位算法研发

为了避免为不同产品设计专用的复杂定位夹具、提高机床柔性化和自动化程度,研究了基于机器视觉的五轴点胶数控机床的工件定位算法。该文提出了一种耦合视觉系统的五轴机床运动学模型标定方法,平均重投影误差达到0.17像素水平。还提出了一种基于五轴机床运动学模型的工件定位算法,并采用机器视觉技术以及非线性优化方法实现了工件定位特征点的加工坐标求解,实验结果表明,通过定位结果求得的定位特征点两两实际物理距离与理论物理距离的平均误差为7.5μm。

基于双转台五轴机床的RTCP及非RTCP加工后置及其仿真实现

阐述五轴机床的RTCP(Real-time Transport Control Protocol)和非RTCP功能原理,研究双转台五轴机床的编程及加工机制。通过实验研究五轴RTCP及非RTCP后处理关键参数定制方法,使用NX后处理构造器建立后处理程序。利用Ver⁃icut平台进行零件仿真加工,分析和比较加工结果,验证所提出的后处理器的正确性。研究结果为相关从业人员提供参考。

公铁两用牵车机技术的研制与应用

针对目前机车车辆生产和检修过程中牵引调车过程繁琐、不安全等问题,依据列车牵引计算和制动理论,研制出适用于机车车辆牵引对位的新技术成果——公铁两用牵车机。对该机进行黏着试验、牵引理论计算、牵引试验、转换试验,给出公铁两用牵车机的各项技术指标,并与机车对比,探讨检修基地内公铁两用牵车机替代调车机的可行性。最后对公铁两用牵车机关键技术进行分析,并介绍其应用场景,指出公铁两用牵车机应用范围的广泛性。