Solidedge软件在阀门设计中的应用

介绍了应用Solidedge软件进行阀门三维实体造型、应用变量表进行参数化设计、应用三维实体转化二维工程图的方法。     

基于SolidWorks的渐开线圆柱齿轮快捷建模方法

在SolidWorks软件环境中渐开线圆柱齿轮的三维实体建模是一个难题,文中介绍了一种快捷的三维实体建模方法,首先使用CAXA软件的齿轮绘制工具生成渐开线圆柱齿轮的二维齿形图,再将二维齿形图输入到SolidWorks软件中完成齿轮的三维实体建模,这种方法极大地提高了渐开线圆柱齿轮三维实体建模的准确度和工作效率.     

基于MDT的三维实体造型方法

简单介绍了三维实体造型软件MDT的结构和MDT中特征的分类 ;详细描述了基于特征的和基于MDT开发工具的三维实体造型方法 ;讨论了运用MDT进行三维实体造型的一般过程。     

基于逆向工程的摩托车覆盖件设计

介绍了逆向工程的含义及其工作流程。首先利用三维激光扫描仪对摩托车覆盖件表面进行测量,获取三维点云数据。然后在Imageware软件中进行点云的去噪处理、特征点的提取、特征曲线的构建和曲面的拼接。最后在Unigraphics软件中进行三维实体建模,为摩托车覆盖件的快速开发提供实体数据。在数据处理和实体建模的过程中,可以在原有基础上进行创新设计。     

蜗轮三维参数化设计系统

应用Visual Basic语言和SolidWorks及其API接口,攻克了蜗轮三维实体参数化造型的难关,开发了蜗轮三维参数化设计系统.并提供一种对SolidWorks软件二次开发的方法,使设计者能够运用该方法对复杂的三维实体进行参数化设计,从而提高开发应用CAD软件的能力.     

齿轮实体参数化造型系统的开发

介绍了应用 Visual Basic(VB)程序语言 ,基于三维机械 CAD软件 Solid Works97平台 ,开发齿轮三维实体参数化造型设计系统的方法。解决了工业生产中齿轮三维实体造型设计的难题 ,并且提供了一种对三维 CAD软件开发的方法 ,使设计者掌握运用该方法进行实际开发 ,提高开发 CAD软件的能力     

3-SPS-S三自由度并联机构静动态特性分析

借助三维实体建模软件Pro/E和商用有限元分析ANSYS Workbench软件,对3-SPS-S三自由度并联机构进行三维实体建模,并对并联机构进行快速建模以及有限元分析,得到了3-SPS-S三自由度并联机构的各向刚度特性及前6阶固有频率的特性。     

带式输送机头部支架的有限元分析

用三维实体造型软件Pro-E创建带式输送机头部支架三维模型,将带式输送机头部支架三维模型导入ANSYS软件对其进行有限元分析,分析结果表明头部支架的强度和刚度满足设计要求。     

离心泵水力元件三维实体造型的研究

在分析国内泵水力元件三维实体造型现状的基础上，提出在二维泵水力设计CAD软件的基础上，采用Pro／Engineer进行泵水力元件的三维实体造型。介绍了径向导叶三维实体造型的方法，同时还给出了离心泵扭曲叶片、双流道叶轮以及蜗壳的三维实体造型图。最后介绍了泵水力元件三维实体造型的应用。     

基于MDT的三维实体造型方法

简单介绍了三维实体造型软件ＭＤＴ的结构和ＭＤＴ中特征的分类，详细描术了基于特征的基于ＭＤＴ开发工具的三维实体造型方法；讨论了运用ＭＤＴ进行三维实体造型的一般过程。     

固定结合面法向静态特性模型研究

分析了以往学者们对载荷-变形规律所作的处理,提出了一种新的拟合模型。设计了结合面静态特性实验台,通过实验,研究了结合面法向刚度随载荷的变化规律。应用指数曲线对变形-载荷曲线进行了拟合,分析了拟合误差,并结合理论和实验结果,对拟合函数进行了改进,提出了新的拟合模型,减小了拟合误差,能够为工程应用提供较高精度的数据。     

齿轮盘铣刀后刀面多轴联动数控磨削仿真

设计直纹面组合刀头,对盘形齿轮铣刀后刀面的数控磨削加工进行仿真.首先根据后刀面设计的理论公式,提出参数化设计方法,给出了在不同前后角参数下后刀面磨削点坐标计算公式及UV网坐标.分析、计算出磨削过程中对应的旋转轴数据,并推导出砂轮半径补偿计算公式.然后,用曲率方法分析磨削时的局部干涉现象,推导出避免局部干涉的砂轮半径可选...     

Effects of type of lubricant and shape of tooth profile upon efficiency of gear drives

To reduce energy consumption, it is important to increase the efficiency of gears used for power transmission. In the present work, the efficiencies of gear drives with standard and profile shifted involute gears are measured by changing the type of lubricating oil. A new equation for calculating efficiency is derived by taking into account the additional friction torque that depends on the shape of the teeth. The efficiencies calculated with the new equation agree well with those obtained by experiments conducted using two planetary gear drives with different tooth shapes and with different reduction ratios (u = 4. 89 and 151). The new equation is applicable to the design of gear drives with higher efficiency.     

Experimental investigation of flow characteristics of a magnetohydrodynamic (MHD) duct of fan-shaped cross section

Experiments along with numerical calculations are carried out to investigate the effect of the geometry of the cross section on flow characteristics of a MHD propulsion duct. A fan-shaped cross-section MHD thruster duct is chosen for comparison with a previously investigated rectangular cross section. Measurement of the velocity field is made using LDV (Laser Doppler Velocimetry) system with a fiber-optic cable and pressure distribution is measured with static pressure holes at the bottom surface. Comparison with rectangular cross section shows that the velocity profile is significantly influenced by the geometry of cross section while the axial pressure distribution is not so affected.     

The influence of the aperture of illumination on the accuracy of microscope-photometric measurements of internal transmittance

The conical shape of the bundle of illuminating rays in the microscope causes a systematic error of transmittance measured with a microscope photometer in comparison with the (true) transmittance measured with a macrophotometer in which the ray bundle is cylindrical. The error is evaluated by the ratio of transmittance measured with the microscope photometer to the true transmittance. It is calculated for the following model objects: parallel-sided plates, wedges, spheres and circular cylinders. The results of calculations show that the error increases with decreasing transmittance, increasing angle of the cone of rays (evaluated by the effective numerical aperture of illumination), and increasing relative size of photometric field. On the whole, the error can be neglected if the true internal transmittance is greater than 0.1 (10%), the numerical aperture is less than 0.45 and the radius of the photometric field (in the object plane) is less than one-fifth of the thickness of the object.     

原子吸收分光光度法在环境分析领域中的应用

原子吸收分光光度法是国内外环境分析中最常见的方法之一,本文介绍了原子吸收分光光度法在环境分析中的应用,对美国ＥＰＡ、日本ＪＩＳ和我国现行的标准法系列和统一方法进行了比较,还报道了ＧＦＡＡＳ测定的样品消解中,可能由于用水及酸类引起的沾污问题,同时对国外ＧＦＡＳＳ法直接测定固体环境试样进行了报道,环境形态分析是ＡＡＳ法的主要应用领域,且该技术在国内外发展很快,以Ａｓ、Ｐｂ、Ｓｎ的形态分析为重点,介绍了ＧＣ－ＡＡＳ、ＨＰＬＣ－ＡＡＳ、ＩＣ－ＡＥＳ在形态分析中的应用,同时,对于使用不同的固体样品处理方法,使用ＡＡＳ测定定重金属也进行了介绍,本文引用至１９９９年国内外文献４４篇。     

加工误差对内齿轮副承载能力的影响分析

借助于Pro/E,ANSYS等工程软件,建立起带有加工误差的内齿轮副啮合模型,并在此基础上分析了加工误差对其承载能力的影响。分析表明该影响随载荷增加而变化,且情况较为复杂,同时揭示齿轮修形相对来讲对于提高承载能力具有更为重要的意义。     

Torsion of thin-walled beams of open cross-section with influence of shear

An approximate analytical approach to the torsion of thin-walled beams of open cross-section with influence of shear is presented. It is assumed that the normal stresses in the cross-section contour direction are small compared to the normal stresses in the beam longitudinal direction that can be ignored in the stress–strain relations. The stresses and displacements are obtained in the closed analytical form. It is assumed that transverse load can be reduced to moments of torsion only, with respect to the cross-section shear centre. The beam will be subjected to torsion, with respect to the shear centre, i.e. the principal cross-section sectorial coordinate, in the case of cross-sections with two axes of symmetry; to torsion and bending in the case of cross-sections with one axes of symmetry and to torsion, bending and tension in the case of general cross-sections. An illustrative example of beam with one axis of symmetry is given.     

Evaluation of Occurrence of Surface Brightness Irregularity in Cold Rolling of Stainless Steel with Emulsion

The manufacturing of stainless steel with higher brightness is improved using emulsion oil. However, in cold rolling of stainless steel with emulsion oil, it is well known that the surface brightness irregularity on the sheet surface after rolling occurs when the rolling speed is higher. It is estimated from the experimental results that the cause of the surface brightness irregularity is due to the degree of starvation in the emulsion rolling. The rolling experiments of the stainless steel with oil-in-water emulsion were carried out at various rolling speeds. The inlet oil film thickness was estimated using the evaluating system. In cold sheet rolling of stainless steel with emulsion oil, the surface brightness irregularity occurred at a rolling speed of 0.6 m/s with emulsion concentrations of 3, 5, and 10%. The experimental results showed that the surface brightness irregularity at cold coil rolling with emulsion of stainless steel occurred under a degree of starvation value of 0.16.     

芯辊进给速度对环件冷轧工艺的影响规律

环件冷轧是一种先进的塑性加工工艺,而其中芯辊的进给速度对环件冷轧工艺有重要影响。本文针对环件冷轧工艺的特点,以数值仿真法为主要研究方法,以有限元分析软件ABAQUS为平台,利用弹塑性动态显式有限元法对环件冷轧变形过程进行了三维数值模拟,研究揭示了矩形截面环件开式冷轧工艺中总压下量不变时芯辊进给速度对轧制力、轧制力矩和环件轴向宽展的影响规律,并分析了进给速度与环件咬入之间的关系。结果表明:进给速度相对较小时,环件的宽展以及鱼尾形状系数随进给速度的增大而急剧减小,端面变得平整;当进给速度进一步增大时,环件宽展以及鱼尾形状系数变化不大;进给速度对鱼尾形状系数的影响主要取决于进给速度对环件外层附近金属的轴向流动的影响;随着芯辊进给速度的增大,轧制力和轧制力矩也相应增大,因此对轧环机力能参数的要求也提高;芯辊进给速度的增大不利于环件的咬入。