平面二包环面蜗杆参数化精准建模研究

平面二包环面蜗杆具有许多优点,实体建模有助于其设计与分析.通过分析齿轮啮合原理,推导出平面二包环面蜗杆齿面方程及平面方程.利用微增量原理,求出蜗杆的交线方程.利用VB,Matlab和Solidworks软件结合所推导公式进行联合编程开发,建立了平面二包环面蜗杆的实体参数化建模系统.同时推导误差解析法计算公式,对软件建模实例进行误差分析,结果证明该建模方法是有效、可行的.该方法使得平面二包环面蜗杆复杂的建模过程简单化,提高了设计效率,有利于平面二包环面蜗杆的推广使用.     

无侧隙双滚子包络环面蜗杆快速变型设计研究

为了提高现代包装机械的生产效率、可靠性和稳定性,提出了将一种新型蜗杆——无侧隙双滚子包络环面蜗杆应用到现代包装机械中。通过对该蜗杆传动副的数学模型和齿面接触螺旋线方程进行分析研究,提出了基于事物特性表的零件快速设计方法。采用高级语言在三维CAD系统中进行了二次开发,采用SQL Server数据库技术建立了事物特性表,实现了无侧隙双滚子包络环面蜗杆的快速变型设计,实例验证了该系统的正确可靠。     

非接触光电检测方法在平面包络环面蜗杆检测中的应用

目前对平面包络环面蜗杆的检测，测量精度低，效率不高。为了提高平面包络环面蜗杆的制造精度，提出了平面包络环面蜗杆精度的非接触光电测量的检测方法，并基于西华大学数控研究所研发的四轴四联动数控磨床对蜗杆进行检测实验，对该检测方法进行了初步的应用。     

基于数值方法的内超环面齿轮齿廓离散建模

超环面行星蜗杆传动系统中的关键零件内超环面齿轮的齿面是一种复杂的空间曲面。为了实现复杂曲面的数控加工和采用有限元方法对其进行接触分析时,能否获得精确的内超环面齿轮的实体模型是解决问题的关键。本文针对内超环面齿轮数字化建模问题,根据内超环面齿轮的数学模型,对其螺旋齿面进行网格划分,提出基于数值方法的内超环面齿轮离散建模方法。该方法采用截平面蔟将内超环面齿轮模型离散成数据点云,从而获得内超环面齿轮离散模型,为后期的复杂曲面插值重构提供了基础。     

直廓环面蜗杆螺旋齿面的数形解析

本文对直廓环面蜗杆螺旋齿面的生成原理进行分析，建立数学表达式，为实现计算机输出创造条件。     

平面包络环面蜗杆副的参数优化设计

提出了平面包络环面蜗杆副参数优化设计的原则和目的,建立了一个优化模型,采用复合形法实现了主要参数的优化设计,并成功地编制了平面包络环面蜗杆副的优化设计程序．     

直廓环面蜗杆的三维建模与加工仿真

结合相关课题的研究和开发,利用ActiveX Automation编程接口,在AutoCAD 2006环境下用VB编程进行二次开发,实现直廓环面蜗杆的参数化三维建模和加工运动仿真．     

机电产品装配过程虚拟仿真课件的研究与开发

虚拟装配技术是一项全新的设计概念,是虚拟制造中的一项关键技术,可用于产品设计阶段进行预装、验证装配工艺的正确性等多个方面,是利用计算机三维建模技术模拟生成与实体零件相同的模型,并可以按照用户需求进行动态装配的一门新兴的三维应用技术.以单级减速器装配过程为例,介绍用Java3D构造虚拟场景,进行单级减速器装配仿真和信息交互课件开发技术.     

基于Pro/E的蜗杆-齿轮减速器三维模型构建及运动仿真

以蜗杆-齿轮两级减速器为例,运用Pro／E参数化建模和3DSMAX动画仿真相结合的设计方案,实现了减速器所有零件的三维模型和虚拟装配;然后经过文件格式转换,在3DSMAX软件中完成对减速器系统的运动仿真,探索出了一套基于Pro／E的多级齿轮减速器快速高效的设计方法．     

基于AutoCAD的阿基米德蜗杆参数化造型程序设计

以AutoCAD为开发平台,以阿基米德蜗杆（ZA）为研究对象,利用AutoCAD所提供的绘图命令绘制出蜗杆毛坯和刀具实体,用坐标的平移、旋转和布尔运算命令模仿机床上工件和刀具之间的范成切削运动来创建蜗杆实体。并以Autolisp为开发工具,进行蜗杆的三维参数化造型程序设计。用户只需加载wlwg程序,输入模数、蜗杆头数等相关参数,便可自动快速地生成蜗杆三维实体模型,操作简单快捷,造型精度较高,大大缩短了产品的设计绘图周期,提高了设计效率。     

大中口径舰炮敏捷供弹系统虚拟样机仿真研究

提出了一套完整的大中口径舰炮敏捷供弹系统。应用三雏实体建模软件PRO／E完成了整个供弹系统各个子系统的模型设计及建立；进行了装配检查，排除了零部件之间的干涉，完善了零部件设计；再利用PRO／E和ADAMS相结合，建立供弹系统各部分的驱动系统，并与实体模型结舍，对此系统进行机构的运动学、动力学和驱动系统仿真，对设计的可行性和合理性进行深入研究．通过以上研究，建立了一个完整的大中口径舰炮敏捷供弹系统虚拟样机，为供弹系统的进一步深入研究以实际生产提供了坚实的基础，同时给军械设计提供了一条高效率、低成本的设计方法．     

基于共轭包络原理的齿面生成计算机模拟与仿真

以共轭齿面包络原理为理论基础,布尔运算为方法,商用三维软件为工具,进行了齿轮加工制造的计算机模拟与仿真研究.取磨前滚刀加工圆柱齿轮为对象,给出了刀具与齿轮之间相对运动关系v12的计算机实现过程,和在商用软件平台上实现齿面包络生成原理的方法与步骤.文中提出的方法无需推导齿轮实体的曲面方程就能够准确、真实地模拟制造过程,建立实际的齿轮齿面几何模型,为复杂曲面零件的CAD/CAE建模与分析提供了新途径.     

基于Pro/E机构模块的齿轮三维实体建模研究

齿廓曲线尤其是齿根过渡曲线的构建是渐开线圆柱齿轮三维实体建模的难点,也是其关键问题。现在所采用的构建方法操作复杂,计算繁琐,且不适合不同刀具加工的齿轮模型的构建。以范成法加工齿轮的原理为理论基础,介绍在Pro/E平台下利用其机构模块的“轨迹曲线”(trace curve)功能精确构建各种刀具加工出来的渐开线圆柱齿轮齿廓曲线的方法,并以磨前滚刀加工直齿圆柱齿轮为例,详细介绍该方法的使用步骤,构建其精确的三维实体模型。该方法无需推导渐开线和过渡曲线的方程就能够方便、快捷地构建出任何刀具加工出来的齿轮模型,为基于啮合原理的复杂曲面零件的有限元建模提供了参考,特别是为复杂曲面零件的CAD/CAE建模与分析奠定了基础。     

由三面投影图生成三维立体图的方法研究

针对创新设计中零部件的三维虚拟造型问题，提出了一种由二维投影图生成三维立体图的计算机化辨识方法。通过辨识简单三维立体的形状和空间位置，克服了二维图形中面的积聚性和零件之间不规则相贯和截交曲线的识别问题，进而实现了复杂组合形体的计算机化设计与造型。最后，以箱体类零件为例，在AutoCAD环境下利用VC 和ObiectARX开发工具编程验证了该方法的有效性。     

UG集成环境下数控机床虚拟样机的实现

数控机床是一种重要的技术装备。为提高数控机床的设计水平和能力,在数控机床的设计开发过程中需要引入新的技术和设计手段。为把虚拟样机技术应用到数控机床设计开发的工程实践中,基于虚拟样机的概念讨论了数控机床虚拟样机的具体实现过程,分析比较了实现该过程的分布式软件平台和UG集成软件平台的特点。以数控铣床新产品开发为例,研究了UG集成环境下数控机床虚拟样机的构建与仿真过程,包括数字模型与装配、运动仿真、结构分析以及在虚拟样机上的加工仿真,给出了相应的示例。研究表明,应用UG的各功能模块可以有效地构建数控机床的虚拟样机并对其进行全面的仿真,使所设计的数控机床得到全面优化,为数控机床的开发设计提供了一种可行的先进方法。     

Modeling of the Starting Performance of Large Solid-Pole Synchronous Motors Using Equivalent Circuit Approach

We present a method of modeling the starting performance of large solid pole synchronous motors based on an equivalent circuit approach. In this approach, the solid rotor body is assumed to have two sets of separate virtual windings. Therefore, the two-axis theory can be used for the solid pole synchronous motor. We derived parameters associated with the solid-pole, together with their transformation coefficients. We simulated the starting performance and validated the results by testing a 15$thinspace$ 000 hp, 13.2 kV, four-pole solid-pole synchronous motor.      

Methods for automated manufacturability analysis of injection-molded and die-cast parts

In this article, a mathematical framework to automatically evaluate the manufacturability of injection-molded and die-cast parts is presented. The framework includes an implemented mathematical algorithm to solve key outstanding challenges in feature recognition for manufacturability analysis of injection-molded and die-cast parts. A novel feature recognition method is developed that is based on decomposing the part into elemental cubes and then, making use of their individual manufacturability, the manufacturability of the part as a whole is evaluated. This article discusses a procedure to obtain a 3D binary representation of the solid model and develops feature recognition techniques to extract critical manufacturability information from this 3D binary array. The outstanding challenges addressed by the method presented include the finding of parting surfaces, parting lines, undercuts, holes, bosses, and finding the direction of mold closure in the context of injection-molded or die-cast parts. The algorithm is implemented using a combination of C++ code and Unigraphics solid modeling software. A short example is presented.     

Virtual prototyping and manufacturing planning by using tri-dexel models and haptic force feedback

This paper presents a new method of using the tri-dexel volumetric models and a haptics force feedback for virtual prototyping and manufacturing planning. In the proposed method, the initial polyhedral surface model is converted to a tri-dexel volumetric model by using a depth-peeling dexelization algorithm. In the virtual prototyping process, the tri-dexel volumetric model is updated by the swept volume of a moving cutter via a haptic force feedback interface device. A collision detection algorithm is proposed for the virtual sculpting and the pencil-cut planning with real-time haptic force feedback to the users. Tool paths are generated for machining the virtual sculpted parts via the simulation and verification on a virtual CNC machine tool before they are actually machined. Computer implementation and practical examples are also presented in this paper. The proposed method enables the haptic-aided virtual prototyping and manufacturing planning of complex surface parts.     

Virtual prototyping and manufacturing planning by using tri-dexel models and haptic force feedback

This paper presents a new method of using the tri-dexel volumetric models and a haptics force feedback for virtual prototyping and manufacturing planning. In the proposed method, the initial polyhedral surface model is converted to a tri-dexel volumetric model by using a depth-peeling dexelization algorithm. In the virtual prototyping process, the tri-dexel volumetric model is updated by the swept volume of a moving cutter via a haptic force feedback interface device. A collision detection algorithm is proposed for the virtual sculpting and the pencil-cut planning with real-time haptic force feedback to the users. Tool paths are generated for machining the virtual sculpted parts via the simulation and verification on a virtual CNC machine tool before they are actually machined. Computer implementation and practical examples are also presented in this paper. The proposed method enables the haptic-aided virtual prototyping and manufacturing planning of complex surface parts.     

Glatt- und Festwalzen an PKW Fahrgestell- und Antriebsbauteilen

Finsh and Solid Rolling of Automotive Running Gear and Drive Components Automotive parts, in particular running gear and drive components, are subject to high dynamic loads in regards to strength. When designing new parts, this is taken into account through dimensioning, material selection and constructional conception. Normally the mentioned measures will not be applied to old designs if, for example, they are subjected later to higher loads because of an increase in engine power output. Only the selection of different materials as well as strength increasing measures and methods remain for these parts. An important method is solid rolling. The examples of completed designs demonstrate the possible strength improvements, influence of rolling force on component strength as well as desired and undesired accompaniments. A comparison is made between solid rolling and other strength improving measures, such as inductive hardening. The results show the solid rolling method to be cost-favorable, very effective and safe in handling. The method has its limits in geometry (open rotation-symmetrical cross sections are required), size (component too large, cross section too filigreed) and application range (temperature) of components.