OpenGL实现数控加工刀具轨迹实时仿真研究

在 Visual C++环境下利用 Open GL 实现了数控铣削三维刀具轨迹和数控车削刀具轨迹包络面的实时仿真。可以实时观察刀具轨迹仿真过程 ,对仿真结果可实现平移、缩放、旋转等操作 ,并可从多方位、多角度进行观察     

面向铣削特征的刀具轨迹生成

介绍了一种面向铣削特征的刀具轨迹生成方法。用户在特征库的支持下首先对所要加工的零件进行特征描述,形成零件的描述文件,然后系统根据描述的特征信息自动生成面向加工中心的加工工艺和数控源代码,生成铣削加工的刀具轨迹,最后利用功能强大的仿真模块对生成的数控代码进行仿真检验,实时显示刀具中心位置,切削用量等参数,若发现数控代码有误,可及时方便地进行修改。     

圆锥曲面数控编程及刀具轨迹仿真分析研究

为提高圆锥特征曲面的加工效率和加工稳定性,建立了一种圆锥特征曲面刀具轨迹分析模型。首先,通过UG软件对圆锥特征曲面进行建模和数控编程。然后,利用Third Wave System—PM仿真软件对刀—工材料属性、刀具轨迹和机床参数进行描述,建立了圆锥特征曲面铣削加工预测模型。最后,利用已经建立的模型对圆锥特征曲面三种刀具轨迹铣削加工过程中的加工时间、切削力、刀具温度和主轴功率进行预测分析和比较。研究认为,往复刀具轨迹相对于单向和螺旋刀具轨迹更适合圆锥特征曲面的铣削加工。     

数控车削加工仿真技术的研究

研究了数控车削仿真的关键技术。根据数据车削加工过程的特点,实现了加工轨迹仿真,加工过程实时仿真和加工过程的干涉碰撞检查,探讨了数控车削NC坐标信息处理方法,对数控车削仿真系统中文本和图形显示进行了开发,提出了实现各种刀具轨迹仿真的可行算法。     

仿真技术在数控车削加工中的应用分析

利用上海宇龙数控仿真软件为工具,进行了数控车削三维仿真加工,完成了典型数控车削零件的程序编辑与程序管理、根据数控车削加工过程的特点,进行了加工过程的程序检查、刀具干涉碰撞和加工过程实时轨迹仿真等各方面的问题验证,经仿真加工出的工件,达到了图纸的加工要求,为新产品投入大批量生产起到了重要作用。     

数控铣削圆柱凸轮的刀具轨迹仿真

介绍圆柱凸轮数控加工时的刀具轨迹仿真方法，利用所研制的软件已成功地在个人计算机上实现圆柱凸轮数控铣削时的刀具轨迹仿真。     

基于刀具实际廓形的数控加工刀具轨迹计算

刀具轨迹生成是自由曲面零件数控加工中最重要同时也是研究最为广泛深入的内容,在自由曲面的多坐标数控加工中,刀具轨迹的优劣直接影响其加工精度和加工效率。传统的刀具轨迹计算方法是利用实际刀具的理想廓形进行的,提出利用刀具的实际廓形进行复杂曲面加工,是通过检测旋转刀具加工工件时的实际廓形,利用实际廓形对已知曲面进行刀具轨迹计算。这种计算方法能有效的提高加工精度,并可以检测新生产出来的刀具是否符合标准。该方法适用于加工刀具为旋转运动的数控加工轨迹计算。     

基于UG的缸体类零件数控铣编程与仿真

数控仿真加工技术是机械加工现代化工业发展的重要基础与关键技术。文中从缩短零件的制造周期及提高加工质量角度出发,探索了缸体类零件的数控铣加工自动编程与仿真。利用UGCAM加工模块进行自动数控编程,优化了加工路线、刀具轨迹、切削方式等工艺参数,并通过虚拟加工过程仿真检查刀具过切、刀具与工件之间的碰撞和干涉。     

基于误差补偿的高速等残留高度刀具轨迹的研究

根据微分几何中短程线的原理,在传统的基于等残留高度刀具轨迹生成方法的基础上,通过判断曲面特性,提出基于曲面特性的误差补偿步长计算法.引入NURBS曲线实现相邻刀具轨迹的平稳过渡,实现高速加工下刀具轨迹行间的平滑优化.以上算法利用Visual C+ +实现,通过仿真得到平稳光顺、载荷均匀的曲面高速加工刀具轨迹.     

基于UGNX 8.0的叶片仿真加工研究

利用UGNX 8.0强大的建模及数控加工模块对复杂零件叶片进行仿真模拟加工,生成叶片粗加工、精加工、分流叶片精加工、流道精加工的刀具轨迹与加工仿真模拟,完成了叶片的仿真加工。     

如何应用有限元分析方法仿真与计算按键寿命

介绍利用有限元分析方法,对一款按键进行疲劳寿命验证与计算。在开模具之前用有限元分析方法能确认按键结构设计是否合理,是否能满足设计需求。避免将来的修改模具,从而缩短产品开发周期。     

FEA-aided design of multi-stage drawing process and tooling for production of a miniature sheet metal component

This paper presents the design of multi-stage drawing process and tooling aided by finite element analysis (FEA) for fabrication of a miniature sheet metal component, made of a cold-reduced carbon steel material (SPCC). To design such a tooling, it is essential to figure out how many intermediate drawing steps are needed to produce the final part without deformation defect. First of all, a four-stage drawing process and a set of four-station tooling are designed. This pre-designed process is then analyzed by simulation, and the deformation behavior and formability in each stage is revealed. Based on the revealed deformation behavior and formability, the design of the process and tooling is confirmed. The reasonable drawing ratio and drawing depth in each drawing operation are determined. The size, clearance, and the corner radii of punch and die in each stage are also identified. The designed process and tooling are finally implemented. Through experiment, the “right design in the first time” is realized, and the simulation and experiment are found to have a good agreement. The research further demonstrates that the FEA simulation can be used as an effective tool to aid the design of metal-formed component, tooling, and process in upfront design process.     

The Computer Simulation of Tribological Influence on Strain Path and Forming Limit in Punch Stretching of Sheet Metal

The purpose of this paper is to describe the principles and results of some numerical simulations of strain path and forming limit analysis in punch stretching operations which include the tribological influence by using a realistic friction model. Three tribological variables (i.e. the mean lubricant film thickness, tooling roughness, and workpiece roughness) are required for the simulation. The calculation of these variables using lubrication theory and related semi-empirical equations are described. The active lubrication regime and suitable friction model can be determined from the current local values of these tribological variables. Friction stress can then be computed from these variables combined with more traditional parameters such as pressure and sliding speed. The limiting dome height and variation of strain path are then predicted by using the coupled FEM and lubrication/friction model. The comparison between the calculated and measured results shows that the present scheme is efficient in computation and will provide a useful tool for industrial applications.     

机器人精加工陶瓷原型技术的路径规划研究

研究了机器人精加工陶瓷原型技术的路径规划方法.生成四种加工路径方案,对比分析了采用这些加工路径得到的精度和效率,提出一种合理的机器人精加工陶瓷原型路径设计方案.根据此方案生成加工路径,实际加工了用于熔射制模的陶瓷原型,其精度及表面质量均满足熔射要求,验证了该加工路径方案的可行性.     

面向熔射快速制模的机器人自动研磨系统的开发

为解决熔射制造大中型汽车覆盖件模具过程中人工研磨时间长、劳动强度大等问题,建立了面向熔射快速制模的机器人自动研磨系统.在该系统上进行机器人研磨工艺参数实验研究,得到了研磨角度、机器人行走速度和路径对研磨表面质量的影响规律;在此基础上选择合适的研磨条件,在通过等离子熔射制造的模具表面皮膜上进行了研磨实验.实验研究结果表明,保持适当的研磨压力,选取合理的机器人行走速度、研磨角度、进给量,可得到较好的研磨效果.该机器人自动研磨系统适用于熔射制造的模具及一般模具的研磨过程.     

基于RP的快速金属模具制造精度控制研究

介绍了基于RP的快速金属模具制造技术，分析了影响模具制造精度的因素。提出金属模具的精度闭环控制系统。研究了在精度闭环控制系统中关键技术－－铸造凝固过程的数值模拟技术。改进了传统的型砂强度理论，提高了数值模拟精度。     

基于管端轴向位移驱动方式的叉形管接件液压成形过程分析

针对叉形(T形类)零件,利用管件内腔体积在成形过程中不断减小的特点,开发了一种管端轴向位移驱动式管液压成形技术。有限元模拟和实验结果表明,使用该方法制造叉形管接件,对设备要求不高,加载路径简单且容易选择,可以大大简化管液压成形设备和生产过程,从而有效地降低成本。     

雷达天线装配测试一体化工装的研制与应用

工装在雷达天线装配中起到承载天线阵面、保证装配精度的作用。天线暗室测试也需要工装来调整天线与测试场之间的相对位置。文中针对某型雷达天线的装配和测试任务,设计了一体化工装,利用Creo软件进行CAD建模,通过ANSYS WorkBench软件对关键结构件的刚强度进行校核。仿真分析和检验结果满足设计要求。研制的装配测试一体化工装的实际应用结果满足任务要求,可以提高装配效率,保证产品精度,满足测试要求,为后续同类工装的研制提供了借鉴。     

Robotic manufacturing of near-net-shape components utilizing stereo imaging and reconfigurable tooling

A process is described to acquire geometrical data of the target object and to utilize it to rapidly create a near-net-shape component with flexible tooling system. The topological data acquisition of the object is made possible using a robot-assisted stereo-imaging technique. Stereo-image data is translated into CAD data, and subsequently the geometric data constitutes the basis for the path planning for the tooling process. A novel, rapidly reconfigurable tooling system and tool forming technology is employed by which a six-axis robotic arm is used to shape a discretized vacuum surface. Pre-heated thermoplastic sheets are formed over the shaped vacuum tool to generate near-net-shape parts. The parts may be trimmed and used as the final component or they may be used as molds for subsequent fabrication of composite components. We demonstrate the process first in the context of an abstract reference part. One of the many applications envisaged using this process is the manufacture of custom-made braces, masks, and guards for use in healthcare products. A patient intervention can have their features acquired using stereo imaging and have corrective measures incorporated into the product prior to manufacturing. Since the geometrical data acquisition process does not require physical contact, the method can be used for patients having epidermal or skeletal damage. Furthermore, employing the rapidly reconfigurable tooling technology will significantly reduce the process cycle time and permit complete customization, benefiting the patient with a quicker and more effective administration of medical assistance. The healthcare context of the proposed integrated process is demonstrated with the manufacture of an orthopedic component with personalized fit.