基于ObjectARX的普通悬挂输送机牵引链条的张力计算

利用AutoCAD面向对象的二次开发工具ObjectARX,并借助于Visual C 6.0的开发平台,在AutoCAD2000环境下实现了悬挂输送机牵引链条的受力分析计算,同时得出链条上最大、最小受力点的大小和位置,拉紧装置的质量以及驱动电机所需的功率等.     

基于DXF图形文件数控加工接口设计

文中分析了DXF图形文件的结构特点，并根据其特点，利用VC＋＋60开发工具设计了从DXF文件中提取图形信息的软件接口，将AutoCAD连接到数控抽工平台中，从而解决了AutoCAD与数控机床的囊成问题。     

链条装夹方法在机械加工中的应用

一、链条装夹方法的用途、 原理及受力分析 链条装夹方法是德国在镗床、铣床上加工薄壁筒体、曲面形状工件而采取的一种装央方法(图1)。它利用链条便于弯曲和可承受较大拉力的特点,装夹时使得链条与工件曲面有较大面积的接触,借拉力将工件牢牢夹住。链条装夹薄壁筒体形状工件的受力情况如图2所示。工件上半圆受到了许多链节的均匀压力,其受力方向都指向圆心;工件下半圆由V型垫铁与工件外圆上的两条线接触而产生两个向心的支撑力,使薄壁筒体工件的受力情况大为改善,加工精度得到了很大提高。 二、链条的选用 链条装夹方法所使用的链条,即目…     

基于ObjectARX与VLISP交叉编程实现机械零件的参数化绘图系统

介绍了在AutoCAD2002下应用其面向对象的二次开发工具ObjectARX与VLISP交叉编程方法，采用可视化程序设计语言VisualC＋＋6．0开发标准机械零件的参数化绘图系统。     

嵌地式立体车库提升机构的选型及疲劳分析

嵌地式立体车库提升机构使用链条,链条在提升立体车库过程中承受主要重量,链板是链条的主要零件,车位的重复升降导致链板的疲劳失效,选用20A、28A两种单双排链条的牵引模式,本文通过ANSYS软件对两种型号链板建模,进行受力分析并采用有限元软件Workbench对其进行疲劳分析,通过比较两种链板的受力分布规律,最终选择最优的链条型号,并能够对链条的失效情况及寿命进一步了解,方便及时维修和更换链条。     

AutoCAD环境下加工特征自动分类系统的开发

：介绍了在AutoCAD环境下开发加工特征自动分类系统的重要性,系统开发的结构模型及其关键技术,并在ObjectARX平台上,运用VisualC＋＋．NET开发工具在AutoCAD工作环境中开发出了属性过滤模块、层管理模块及孔分层模块。     

基于ObjectARX轴类零件参数化绘图的研究与开发

轴类零件采用AutoCAD基本绘图和编辑命令绘制效率低,编辑困难.以AutoCAD为二次开发平台,基于实体特征,采用ObjectARX和VC＋＋实现轴类零件的参数化绘图,可以大大提高轴类零件的绘图自动化程度以及编辑效率.     

关于SGZ730型刮板输送机链传动啮合特征的研究

以刮板输送机链条与链轮啮合特征为出发点,研究链条的啮合特点,以提高链条可靠性为目标,分析链条与链轮在传动啮合过程中的受力情况以及啮合应力分布特征.分析结果显示:平环直接参与到链条与链轮之间的载荷传递,受力更大且更容易产生破坏;链轮上作用力较大的位置主要集中在链轮链窝位置.因此为了防止链轮的链齿的齿根位置发生断裂,应在链轮的结构设计中重点考虑该区域的优化.该研究对提高链条与链轮的可靠性具有重要意义.     

机床夹具参数化零部件图形库及其系统

介绍了在AutoCAD For Windows环境下，一种基于客户机／服务器模式的机床夹具参数化零部件设计的方法，研究了参数化零部 设计以及使用C＋＋语言模操作SQL Server数据库的方法。     

移动极板静电除尘器链条的有限元受力分析

运用有限元软件对工作条件下移动极板静电除尘器的链条在进行了受力计算。通过该分析计算的结果,提出了链条优化设计的方法。     

疲劳对金属塑性变形及延性断裂过程的影响

通过慢速拉伸曲线,研究金属的塑性变形过程和延性过程中细微的变化,以及疲劳对它们的影响。在对金属材料做静拉伸试验时,在一般速率拉伸和在慢速拉伸下,所得到的拉伸曲线的表现是不同的。比较了拉伸速率10mm/min和0.2mm/min的拉伸曲线,在弹性变形范围内,2种速率下的曲线基本上是一样的;在塑性变形阶段,慢速拉伸曲线将随着载荷的增加,曲线逐渐变粗,当通过最大载荷点1段后,曲线变到最粗,然后变成1条线;在断裂阶段,曲线出现间断卸载的叉枝,直到断裂。     

Ribbed strip rolling by three-dimensional finite element method combining extremely thin array of elements

In this paper, a three-dimensional finite element modelling of the ribbed strip rolling is carried out, coupling the use of an extremely thin array of elements that is equivalent to the calculation of the additional shear deformation work rate occurred by the velocity discontinuity in the roll bite. The formulation of the finite element modelling by adding a rib inclined contact surface boundary condition is derived, and the performance of the proposed method is conducted. The simulated rib height, forward slip, and the pulling down of rib height have been compared with the measured values and are in good agreement. The equivalent strain rate of the rib was obtained in the simulation. The effect of the rib inclined angle on pulling down of rib height has also been discussed, which is helpful in optimizing the design of the rib inclined angle.     

Ribbed strip rolling by three-dimensional finite element method combining extremely thin array of elements

In this paper, a three-dimensional finite element modelling of the ribbed strip rolling is carried out, coupling the use of an extremely thin array of elements that is equivalent to the calculation of the additional shear deformation work rate occurred by the velocity discontinuity in the roll bite. The formulation of the finite element modelling by adding a rib inclined contact surface boundary condition is derived, and the performance of the proposed method is conducted. The simulated rib height, forward slip, and the pulling down of rib height have been compared with the measured values and are in good agreement. The equivalent strain rate of the rib was obtained in the simulation. The effect of the rib inclined angle on pulling down of rib height has also been discussed, which is helpful in optimizing the design of the rib inclined angle.     

圆形堆取料机俯仰机构拉力保护软件建模和应用

针对圆形堆取料机取料机构的具体特点,阐述了俯仰机构设置钢丝绳拉力传感器和PLC程序中设置拉力保护软件模块的必要性,分析了钢丝绳拉力保护曲线与各取料机构之间的保护逻辑关系,提出在软件模块中采用最小二乘法拟合钢丝绳拉力保护曲线的方法和步骤.最后结合实际工程项目,阐述了在实际应用中需要注意的问题.     

金属长纤维横截面的形成机理

分析了采用大刃倾角－ 拉屑复合切削方法制造连续型金属长纤维时纤维横截面的形成机理。通过试验研究了刀具法向前角、拉屑力和拉屑角等对纤维横截面形状和金相组织的影响。     

汽车等速驱动轴与变速箱联接的紧定研究

研究前驱汽车等速驱动轴与变速箱之间的花键轴联接和定位环卡紧,推导出驱动轴安装和拔出时使定位环收缩的压入力、拔出力的计算公式,得出压入力、拔出力的大小由定位环的设计参数和导向角、摩擦系数确定,拔出力对压入力的比率系数,是稳定的常数,是由联接零件半轴齿轮上压入导向角、拔出导向角确定的。     

抽油机套筒滚子链条链板疲劳强度计算

采油现场发生了皮带抽油机链务外链板疲劳断裂事故,由此,主要针对链条外链板进行了受力分篓与疲翟登度计算,分析表明,外链板与销轴的过盈量过大,在链板中产生了过大的初始拉应力,导致交变拉应力过大,降低了链板疲劳强度。     

基于ADAMS的垃圾运送车拉臂系统优化设计

垃圾运送车拉臂系统的传统设计大都采用类比法或经验取值法,限制了产品性能的进一步提高,已不能适应高速发展的城市垃圾清运工程.采用动力学仿真软件ADAMS(Automatic Dynamic Analysis of Mechnical System)建立了垃圾运送车拉臂系统的仿真模型,并进行优化设计.优化结果表明,该设计性能良好,符合垃圾清运车辆密封化、大型化的发展趋势,同时缩短了设计周期,节约了产品成本,对同类产品的开发设计具有较好的指导意义.     

基于Pro/E的筐壳类塑件注塑模具设计与制造

针对筐壳类塑件壁薄、难以成型的特点,探讨了Pro/E软件在注塑模具设计中的优点,介绍了注塑模具开发的一般流程.设计了前、后、左、右四个侧向的斜导柱侧抽芯机构,来成型侧面孔和实现侧向抽芯.把整个型腔设计成侧滑块和型腔底板的形式,降低了模具型腔加工的难度.采用模具专家系统EMX,提高了设计效率.在传统的设计基础上,将模流分...     

Heat Transfer during the Solidification of Hot Dip Aluminizing Coating

Hot dip aluminizing is one of the most effective methods of surface protection for steels and is gradually gaining popularity.Although the pulling speed is one of the most important parameters to control the coating thickness of aluminizing products,however,there are few publications on the mathematical modeling of pulling speed during the hot dip process.In order to describe the correlation among the pulling speed,coating thickness and solidification time,the principle of mass and heat transfer during the aluminizing process is investigated in this paper.The mathematical models are based on Navier-Stokes equation and heat transfer analysis.Experiments using the self-designed equipment are carried out to validate the mathematical models.Specifically,aluminum melt is purified at 730 ℃.The Cook-Norteman method is used for the pretreatment of Q235 steel plates.The temperature of hot dip aluminizing is set to 690 ℃ and thedipping time is set to 3 min.A direct current motor with stepless speed variation is used to adjust the pulling speed.The temperature change of the coating is recorded by an infrared thermometer,and the coating thickness is measured by using image analysis.The validate experiment results indicate that the coating thickness is proportional to the square root of pulling speed for the Q235 steel plate,and that there is a linear relationship between coating thickness and solidification time when the pulling speed is lower than 0.11 m/s.The prediction of the proposed model fits well with the experimental observations of the coating thickness.