动触头三个焊面同时钎焊方法的研究

研究了感应钎焊ＣＪ－２１５接触器动触 头三个焊面同时焊接的方法。试验结果表明,三个焊面钎合情况良好,两触 头的高度尺寸精度高,可以满足动触头钎焊的大批量生产。     

挖掘机动臂动臂沉降超差分析

介绍了采用川崎KMXR系列主阀挖掘机动臂保持液压回路原理,对可能造成动臂沉降的原因逐一分析,最终解决挖掘机动臂沉降超差故障。     

动车铝齿轮箱加工关键工艺探讨

动车铝齿轮箱体是整个动车组齿轮箱驱动装置的重要组成部件之一,其加工质量直接影响装车后的行车安全。为保证铝齿轮箱体质量,主要介绍了解决铝齿轮箱体加工过程中遇到的工艺问题的方法。     

动模套的工艺研究与加工实现

根据产品模具动模套的设计要求,分析了其加工的技术要求,编制了机械加工工艺,解决了加工过程的关键难题,实现了产品动模套模具的加工。     

汽轮机动叶片集中工序加工工艺研究

针对某型号汽轮机的一种典型动叶片结构特点,采用现代先进设备及专业软件,改进了传统工艺流程,应用高度集中的五轴数控加工手段来完成动叶片多部位的一次性加工,提高产品加工质量,降低成本,满足产品设计以及装配的要求。     

轴承套圈止动槽车加工位置的确定

轴承套圈加工工艺尺寸,由于某些测量方法受到限制或受到加工条件的限制,并要改变其测量基准时,需要进行工艺尺寸链计算。在制定零件加工工艺过程中,运用尺寸链的基本理论去分析零件加工各工序之间,以及各工序内相关的尺寸关系,从而正确地确定每一个工序中各加工表面的工序尺寸及公差,对于保证零件的加工精度和加工过程的经济性都有很重要的意义。     

锡青铜触头的热处理工艺

我公司生产的某些开关设备触头零件（见图1）采用锡青铜材料，要求具有良好的弹性、耐磨性、抗磁性和耐蚀性。由于该零件形状较复杂，在冲压、折弯加工过程中，为使加工件在保持一定强度与弹性的前提下具有足够的韧性，避免工件折弯时在弯角处产生开裂，需要对该类材料工件进行必要的退火处理。为此，如何制订适宜的加工工序及热处理工艺，以便满足零件设计要求及生产需求就显得十分必要。     

数控机床加工尺寸随机性超差故障诊断与处理

论文结合维修数控机床的实例,从半闭环数控机床精度控制方法着手,通过对6个维修案例进行深入剖析,介绍数控机床易出现的加工尺寸随机性超差故障分析及维修方法。     

The actual contact area of moving surfaces

Hertzian contact is generally assumed when calculating the actual contact area of two surfaces. However, Hertz's formula is strictly only valid when there is no tangential stress in the region of contact. If the two surfaces are moving relative to one another then there will be frictional stress so that the assumption of Hertzian contact cannot be entirely valid. The twodimensional problem of contact with tangental stress is very difficult even for asperities with spherical symmetry. However, for shapes uniformly infinite in one direction it is tractable. The dependence of contact area on load is examined in this case and found to be generally dependent on the frictional force except for the case of circular cross section in which it is the same as for the frictionless problem. The significance of these results is discussed.     

硅晶片抛光加工工艺的实验研究

双面抛光已成为硅晶片的主要后续加方法,但由于需要严格的加工条件,很难获得理想的超光滑表面.设计了硅片双面抛光加工工艺新路线,并在新研制的双面抛光机上对硅晶片进行抛光加工,实验研究了不同加工参数对桂晶片表面粗糙度和材料去除率的影响.采用扫描探针显微镜和激光数字波面干涉仪分别对加工后的硅晶片进行测量,实验结果表明:在优化实验条件下硅晶片可以获得表面粗糙度0.533nm的超光滑表面.     

矩形解锁脱落电连接器中套管加工工艺研究

矩形解锁电连接器是电子设备与地面设备之间的电路连接与自动脱落的机电元件.套管作为矩形解锁电连器中的关键零件之一,对产品的性能起着决定性的作用.针对套管壁薄、孔深、多台阶的结构特点和尺寸精度、形位精度要求高、表面相糙度值小的技术要求,研究了一套合理的加工工艺方案.     

基于薄壁矩形深腔体防变形数控加工工艺研究

薄壁矩形深腔体零件在加工、装配及库存过程中极易产生变形,由于工件材料、壁厚、刚性、装夹等多种原因,导致零件加工工艺编制的难度增加。通过实例从零件的变形理论分析、防变形工艺方法等角度出发研究了薄壁矩形深腔体零件的数控加工工艺。     

Transient temperature of local moving areas of sliding contact

A procedure for determining the temperature field in concentrated sliding contacts is developed. Previous solutions for stationary heat sources are reviewed and the effects of motion of the hot spots in the intermittent contact of the asperities are discussed. The transient cooling after cessation of heating is examined. A quantitative assessment of sliding speed effects on the contact temperature is made.     

A study on large-area laser processing analysis in consideration of the moving heat source

This study proposed a way of reducing the time and memory required for analysis by adjusting the heat input area, to overcome the difficulties in analyzing large-area laser processing. An analytical model was manufactured using existing research results, and based on these results and the volume of the analysis, the efficiency of the new analysis method was verified. The new analysis method proposed in this study can be used as a simple analysis method utilizing a commercial analysis program for diverse areas, including the effect of temperature distribution on the material, the effect of temperature transfer on the mechanical structure, and thermal displacement prediction, in the thermal treatment after processing.     

过盈配合接触界面的研究

通过W-M函数建立具有分形特征的等效粗糙表面与刚性平面的接触模型,模拟压缩机叶轮与轴过盈配合下界面的接触。将接触模型导入到有限元软件Ansys中,分析接触模型接触面积、接触压力、滑移面积、粘着面积与变载荷的关系和表面路径上的应力与变形。结果表明,接触时只有个别较高的微凸体发生接触,微凸体肩部区域的应力较大,微凸体中心位置变形量最大,接触界面在一定的法向载荷下接触面积减小,粘着面积增大,配合件发生了宏观的变形。     

锻制不锈钢阀体加工工艺的分析与研究

论述了锻制不锈钢阀体加工特点,通过加工工艺方案比较,给出了液压六角转塔机床加工阀体工艺。     

Development of contact sliders with nanotextures by femtosecond laser processing

The information on the frictional resistance of a self-propelled robotic capsule endoscope moving inside the body is very important for the design and the performance enhancement of such parameters of the capsule endoscope as power consumption, motion control and positioning accuracy. Based on this motivation, the ultimate goal of this research was to develop an analytical model that can predict the frictional resistance of the capsule endoscope moving inside the living body. In this work, experimental investigations of the fundamental frictional characteristics and the viscoelastic behaviors of the small intestine were performed by using custom-built testers and various capsule dummies. The small intestine of a pig was used for the experiments. Experimental results showed that the average frictional force was 10–50 mN and higher moving speed of the capsule dummy resulted in larger frictional resistance of the capsule. In addition, the friction coefficient did not change significantly with respect to the apparent area of contact between the capsule dummy and the intestine, and also the friction coefficients decreased with an increase in the normal load and varied from 0.08 to 0.2. Such frictional behaviors could be explained by the lubrication characteristics of the intestine surface and typical viscoelastic characteristics of the small intestine material. Also, based on the experimental results, a viscoelasticity model for the stress relaxation of the small intestine could be derived.     

Signal processing in laser triangulation sensors for geometric parameters of moving objects

Signal processing in the COMPLEX automated measurement system designed for noncontact inspection of wheel pairs of freight trains is described. The chosen coordinate base and methods of signal filtration and reconstruction ensure high reliability of measurement results during commercial operation even under conditions of intense atmospheric interferences.