磨牙冠四轴联动加工的后置处理与仿真

对磨牙冠结构特性、加工刀轨特点以及四轴联动雕刻机旋转轴特性进行分析,在此基础上提出其四轴联动加工的后置处理算法.在该算法基础上,利用Visual C++6.0软件开发出单独的后置处理程序,将加工刀轨的刀位文件处理生成ISO格式的G代码文件.为了验证后置处理程序的正确性,利用数控仿真软件Vericut 7.0建立四轴联动雕刻机的仿真模型,对后置处理程序生成的G代码文件进行仿真.仿真结果表明,后置处理程序符合预期要求.     

双转台五轴立式机床专用后置处理算法

通过分析WABECOH双转台五轴立式数控机床各轴的运动关系,建立各轴运动关系的数学模型,并开展机床运动学求解,给出了该五轴机床后置处理的转动角度和坐标变换计算公式。根据转动角度和坐标变换的计算公式,利用C++语言开发了WABECOH五轴数控机床专用后置处理程序,基于所提后置处理方法进行了叶轮类复杂零件的加工仿真与实验验证。结果表明,所开发的专用后置处理软件生成的数控代码可以满足该机床五轴联动的要求,较好地解决了该类机床的后置处理问题。     

基于NX的DMU 160P五轴联动机床后处理器开发研究

随着设计性能要求和装备制造能力的不断提升,机械制造行业中多轴联动设备的应用越来越广泛。后置处理程序对充分发挥设备性能具有重要作用,因此基于DMU 160P五轴联动机床,分析机床的结构和运动特点,制定基于NX的五轴后处理器开发任务流程并完成后处理器的开发,并通过VERICUT仿真和实际加工验证后处理器生成的NC代码的正确性。     

基于CATIA的五轴水切割后置处理开发

针对CATIA数控加工的刀位文件,通过分析通用后置处理程序过程,开发五轴联动水切割机床的后置处理程序,解决五轴水切割数控加工的自动编程问题。实际切割结果证明,开发的后置处理程序能够正确将CATIA软件生成的APT刀位数据转换成五坐标水切割数控加工程序。     

非正交五轴联动数控机床后置处理技术研究与应用

通过对非正交五轴加工中心德玛吉DMU50E机床结构及参数的分析,构建该机床运动学模型,推导出工作台运动角度计算和直线坐标变换公式。将该算法通过Tcl语言编程并应用于UG后置处理器中,配制出该机床的非正交五轴联动数控加工后置处理程序。应用机床仿真软件VERICUT对该后置处理生成的NC程序进行验证,该后置处理程序稳定可靠,现已成功应用于工程中。     

经济型五轴数控机床后置处理系统研究与应用

在双转台五轴数控机床结构的基础上,通过分析机床结构坐标系和CAM加工坐标系的关系,建立其机床加工刀头运动轨迹的数学模型,推导出该类型机床的后置处理转角计算公式和坐标转换计算公式。根据推导结果,在UG/PostBuilder通用后置处理器的基础上,针对不同类型五轴联动数控机床选配特定数控系统,设定机床参数、程序和刀轨参数、NC代码格式设置,编制了双转台式五轴数控机床的专用后置处理程序,经实际加工验证可以满足经济型五轴联动后置处理的要求。     

点云直接生成刀具路径及其后置处理

通过最小化每个刀位网格单元的加工误差以确定每个刀位网格的节点位置,加权平均相关联刀位网格节点来对齐相邻刀位网格单元的边缘,生成高效合理的数控加工刀具路径.对所获得的具路径信息进行后置处理,根据机床的结构不同,采用了相应的坐标转换,生成用于三轴加工和五轴加工的G代码.利用Vericut软件,对数据点云直接加工的刀具路径进行了动态仿真,最后应用实例验证了后置处理生成G代码的有效性.     

五轴联动数控机床的后置处理方法

后置处理是数控编程的重要环节 ,它的作用是将 CAM系统生成的刀轨文件转化为机床的加工代码。五轴联动的后置处理涉及到刀位文件的转角计算和坐标变换计算 ,坐标转换关系比较复杂 ,本文研究了立卧两种状态的五轴联动数控机床的后置处理 ,在分析了机床坐标系和工件坐标系关系的基础上 ,推导了坐标变换公式 ,并开发出了相应的后置处理软件 ,其结果满足五坐标联动后置处理的要求     

基于Mastercam X~6旋钮五轴编程与加工研究

分析旋钮的五轴加工工艺,合理选用挖槽粗加工和五轴沿面精加工方法,对Mastercam X6的五轴刀轴控制方式及其关键参数进行了探讨,并在旋钮零件中进行合理的选择,生成五轴刀具轨迹。根据HASS五轴机床设置相应的后置处理程序,并经Vericut软件实体仿真,无干涉和碰撞,从而验证五轴后置处理和刀具路径的正确性,为五轴高效优质加工提供可靠的技术参考。     

基于MasterCAM的变螺距螺杆三维建模及数控加工

本文采用CAD/CAM软件对变螺距螺杆零件进行三维建模、利用MasterCAM软件的仿真模块对零件的加工过程进行仿真并经过后置处理生成数控加工代码。利用该数控程序,在四轴联动数控机床上进行实体加工并获得成功。     

基于OpenGL的五轴数控铣削仿真

在UG中进行多轴加工后处理时,由于选项设置和机床数据文件配置不当,会导致生成的G代码程序存在错误.为了及时发现程序中的错误,利用OpenGL三维图形接口,在Visual C++开发环境下实现了五轴G代码程序的离线和在线仿真功能,集成到自行开发的等离子熔积铣削复合机床上位机软件中;并利用仿真功能进行了铝合金整体叶轮的铣削加工试验.     

五轴数控空间刀具半径补偿的实现

深入分析了空间刀具半径补偿矢量的计算方法,对实现该空间刀补矢量到五轴联动数控系统中做了算法的准备和验证,并以UG NX6.0生成的刀位文件(CLSF)为坐标数据来源和五轴联动A/C双转台机床为例,开发了一个专用后置处理软件,并通过在Vericut7.0上模拟和五轴联动机床上实际加工叶片,加工结果说明了该算法的正确性和软件的实用性。     

Postprocessor development for ultrasonic cutting of honeycomb core curved surface with a straight blade

When ultrasonically cutting honeycomb core curved parts, the tool face of the straight blade must be along the curved surface’s tangent direction at all times to ensure high-quality machining of the curved surface. However, given that the straight blade is a nonstandard tool, the existing computer-aided manufacturing technology cannot directly realize the above action requirement. To solve this problem, this paper proposed an algorithm for extracting a straight blade real-time tool face vector from a 5-axis milling automatically programmed tool location file, which can realize the tool location point and tool axis vector conversion from the flat end mill to the straight blade. At the same time, for the multi-solution problem of the rotation axis, the dependent axis rotation minimization algorithm was introduced, and the spindle rotation algorithm was proposed for the tool edge orientation problem when the straight blade is used to machine the curved part. Finally, on the basis of the MATLAB platform, the dependent axis rotation minimization algorithm and spindle rotation algorithm were integrated and compiled, and the straight blade ultrasonic cutting honeycomb core postprocessor was then developed. The model of the machine tool and the definition of the straight blade were conducted in the VERICUT simulation software, and the simulation machining of the equivalent entity of the honeycomb core can then be realized. The correctness of the numerical control program generated by the postprocessor was verified by machining and accuracy testing of the two designed features. Observation and analysis of the simulation and experiment indicate that the tool pose is the same under each working condition, and the workpieces obtained by machining also meet the corresponding accuracy requirements. Therefore, the postprocessor developed in this paper can be well adapted to the honeycomb core ultrasonic cutting machine tool and realize high-quality and high-efficient machining of honeycomb core composites.     

基于UMAC的开放式数控平台的构建与应用

基于UMAC控制器开发了一种开放式数控平台,硬件平台由"IPC+UMAC"组成,IPC和UMAC之间通过以太网进行通讯;软件平台基于Windows操作系统,由Windows上位应用软件和运行于UMAC中的PLC和G代码程序组成.通过该平台在五轴雕铣机数控加工中的应用表明,该开放式数控系统具有速度快、精度高、稳定性好等优点,适合用于多电动机、高精度的运动控制.     

Development of a 3-axis desktop milling machine and a CNC system using advanced modern control algorithms

In this paper, we introduce a desktop-size 3-axis milling machine and a CNC system which was developed to operate the 3-axis milling machine. The 3-axis milling machine has a mini-desktop size of 200×300×200 mm³ and its cutting volume is 20×20×20 mm³. The vertically installed XY stage is driven by voice-coil motors, and for the zaxis, a magnetically preloaded air bearing and a linear motor are used. The air spindle runs at up to 160,000 rpm. The gravity force is acting on the y-direction, so a weight balancer using an air bearing cylinder is installed to cancel out the gravity force acting on the XY stage in the y-direction. The CNC system designed for the 3-axis milling machine consists of two parts. The one is a graphical user interface program which runs under Microsoft Windows and the other is a DSP program which is implemented on a DSP board with TI TMS320C6701 chips. A G-code interpreter is included in the CNC system which can interpret and interpolate a basic set of G-codes and M-codes in real-time. To improve the performance of servo control loop in the CNC system beyond the traditional PID-type control, several modern control algorithms have been tested including H_∞ control, input shaping control, disturbance observer and cross-coupled control on the 3-axis milling machine. Experimental results show the effectiveness and drawbacks of each control scheme when they are applied to the 3-axis desktop milling machine.     

基于UG软件的五轴数控加工后置处理研究

从分析刀轨文件和NC代码的格式入手,找出指令的一一对应关系,弄清诸多从建模到加工过程中的坐标系统,建立5坐标铣削中心坐标转换数学模型,从而实现从刀轨文件提取信息转化为NC代码的算法.最后通过实例验证了该加工中心后置处理技术的正确性.     

基于VC的数控机床转换程序设计

分析了五轴龙门铣床FPF—N／C和Fpm-60的机床结构和运动特点及数控系统特点,计算出后置处理的相关算法,开发了基于VC的数控机床转换程序,经过加工证明了开发的转换程序的正确性。     

Extraction of 5-axis milling conditions from CAM data for process simulation

5-axis milling is widely used in machining of parts with free-form surfaces and complex geometries. Although in general 5-axis milling increases the process capability, it also brings additional challenges due to complex process geometry and mechanics. In milling, cutting forces, tool deflections, and chatter vibrations may reduce part quality and productivity. By use of process simulations, the undesired results can be identified and overcome, and part quality and productivity can be increased. However, machining conditions and geometry, especially the tool–work engagement limits, are needed in process models which are used in these simulations. Due to the complexity of the process geometry and continuous variation of tool–work engagement, this information is not readily available for a complete 5-axis milling cycle. In this study, an analytical method is presented for the identification of these parameters from computer-aided manufacturing data. In this procedure, depths of cut, lead, and tilt angles, which determine the tool–workpiece engagement boundaries, are directly obtained the cutter location file analytically in a very fast manner. The proposed simulation approach is demonstrated on machining of parts with relatively complex geometries.     

微细加工铣床研制及其铣刀的力学特性分析

研制了一台由直线电机运动平台、高速空气静压电主轴和DMC-1842运动控制卡组成的三轴联动微细铣削机床。开发了可编辑和执行G代码程序的数控系统,并利用有限元法对微细铣刀的力学特性进行分析。通过模态与静力学分析,研究微细铣刀的固有频率和振型,探讨刀具的悬伸长度对加工过程中刀具振动的影响,以及微细铣刀的应力和变形特点。