新型可调机器人水刀夹持装置

机器人水刀夹持装置是一种用于将水刀可调安装于机器人本体上的装置,该夹持装置包括:与机器人的机械臂连接的连接杆;与水刀连接的连接轴;一端与连接杆连接、另一端与连接轴连接的中间连接件;固定中间连接件于连接杆和连接轴的相对位置的固定件.水切割设备采用夹持装置后,可以提高水刀的工艺性能.由于中间连接与连接杆的连接及中间连接件与连接轴连接至少其中之一的连接方式为转动连接,在更换水刀及其配件后,只需要松开固定件,调整中间连接件、连接杆及连接轴之间的相对位置,就能达到将水刀末端的喷嘴置于标准位置的目的,而无须给机器人进行示教轨迹调整,故此节约工时、原材料及备件的费用.     

硅树脂805的裂解过程及高温连接陶瓷性能研究

研究了硅树脂805的裂解过程,在此基础上采用硅树脂805高温连接氮化硅结合碳化硅陶瓷,研究了连接温度、连接压力以及活性填料对连接性能的影响.结果表明,在1 000～1 400 ℃范围内,随着温度的升高,硅树脂裂解产物发生了由非晶态向晶态的转变.采用单一硅树脂805为连接剂时,连接温度、连接压力对连接强度均有较大影响,当连接温度为1 200 ℃,连接压力为100 kPa时,连接试样抗弯强度达70.5 MPa.硅树脂中加入适量的活性填料-纳米Al粉可有效地提高连接强度,同时降低连接温度,连接温度为1 100 ℃所获连接试样抗弯强度达最大值102.6 MPa.微观结构分析显示,连接层结构较为均匀致密,连接层与母材间界面接合良好.     

剖分式滚动轴承保持架连接方式

连接方式是剖分式滚动轴承保持架设计的关键。介绍了U形弹性夹连接、C形弹性夹连接、弹性板连接和螺钉连接等剖分式保持架的连接方式,详细分析了每种方式的连接原理、适用场合及优缺点。     

高速冲击连接技术的研究进展

与传统的熔焊工艺不同,高速冲击连接可以有效地减小热影响区和连续金属间化合物的形成,从而保证结合区域的机械性能,并且几乎能够实现任意金属材料间的连接,具有广阔的发展和应用前景.高速冲击连接可以分为驱动飞板高速移动和冲击连接两个过程,主要包括爆炸连接、电磁脉冲连接、激光冲击连接和汽爆连接四种工艺.简要介绍了四种冲击连接过程...     

基于VDI标准柴油机连接箱螺栓强度分析

对于分体式设计的柴油发电机组,柴油机与主发电机之间过渡连接的部分的通常采用连接箱进行结合,这就要求连接箱的螺栓具有良好的安全性能,文中以连接箱与柴油机连接螺栓作为研究对象,建立螺栓连接有限元连接模型,采用非线性静强度有限元计算,得到连接箱与机体连接螺栓的受载情况,然后运用VDI2230标准对连接螺栓进行多维度的安全校核,结果得到连接螺栓的屈服安全系数、疲劳安全系数、表面压应力安全系数、抗滑移安全系数均符合设计要求,具有良好的安全性能,对实际生产具有指导意义。     

阀门与管路连接的小套路

阀门与管路或设备之间的连接方式的选择是否正确合适,会直接影响到管道阀门产生跑、冒、滴、漏现象的机率.常见阀门的连接方式包括:法兰连接、对夹连接、对焊连接、螺纹连接、卡套连接、卡箍连接、自密封连接等连接形式.     

TOX连接技术在板件连接中的应用

现代钣金制造业的激烈竞争和快速发展,对行业中金属板件的连接技术提出了越来越高的要求,传统的点焊、铆接作为业界常用的不可拆卸式金属板件的点连接方法,均存在着经济及技术上的不足和使用上的局限性。TOX连接是一种新的连接技术,又称为无铆钉铆接。本文主要介绍了TOX连接的原理,TOX连接与其他点连接方式相比的优越性,TOX连接采用的模具和设备及其在板件连接中的具体应用。     

整机互联中挠性传输载体接口连接技术研究

研究了2种实现挠性传输载体接口的连接技术,即插针连接和压板连接,并分别对2种连接方式进行了有限元建模和可靠性分析,对压板连接还进行了电接触特性分析,通过工艺试验验证了2种连接方式的可行性。     

浅析焊接在衡器制造中的重要性

钢结构所采用的连接方法有焊接连接（焊缝连接）、铆钉连接、普通螺栓连接和高强度螺栓连接等,而在衡器产品的设计中,最常用的是焊接连接.本文着重谈在衡器制造中的焊接连接及其影响因素.     

叉车转向管柱连接法兰锈蚀问题的解决方法

1台某型叉车转向管柱连接法兰产生锈蚀,严重影响叉车的转向性能。叉车转向管柱总成下的连接法兰,用于将转向盘的转向动力通过液压传动部件传递到转向桥,实现叉车转向动作。1.锈蚀原因转向管柱通过万向节、连接轴、连接法兰与液压转向器相连接来传递转向动作,如图1所示。为了保证连接法兰的密封性,保护连接法兰上端轴承,在连接轴外侧安装了橡胶护套。     

Computer controlled brilliant cutting of flat glass

Brilliant cutting is a grinding process used to cut and polish decorative patterns into flat glass. It is a labour intensive process and essentially requires a skilled cutter to present a sheet of flat glass to a grinding wheel. Manual manipulation of the glass is then used to enable the grinding wheel to cut the desired pattern into the glass. This paper describes a CAD/CAM system which has been developed to replace this manual process. The basic design concept involved allowing a grinding wheel to move whilst keeping the workpiece stationary. Fiveaxis manipulation of the grinding wheel was required to ensure that a wide range of decorative shapes could be successfully generated and CNC part programs were developed from 2D drawing data.     

基于柔性可控气液界面的微尺度执行器

为了在微尺度范围内实现对目标对象进行柔性施力、推拉等一系列微纳操作,提出一种通过生成控制单个微尺度气泡直接与目标对象进行微纳操作的方法.当用气泡作为执行器对目标对象施力时,由于气体的可压缩性,气泡会被挤压变形,实现了柔性施力的过程.首先通过毛细管连接气泵的方式在液体环境下生成单个微尺度气泡,并定性分析气压法生成控制气泡...     

综采支架缸拆装机的设计

综采支架缸拆装机是一种用于煤矿机电维修车间综采支架缸的拆装装置,它采用液压系统向设备提供动力,输出扭矩大,具有自保作用,棘轮棘爪机构与液压马达结合,可强力拆卸“锈死”的支架缸,具有集成性、操作简单、功能完善、结构合力、构思新颖、使用安全可靠、维护简单方便等特点,它广泛适用于缸径为360～600mm综采设备支架缸的拆装.     

计算机辅助设计凸轮及其数控加工

介绍了如何利用计算机对于形状复杂和高精度的凸轮进行辅助设计,以及将设计结果直接在数控机床上加工的方法,分析了图解法设计的局限性和计算机辅助设计的优越性,指出了利用计算机辅助解析法设计是实现数控加工的基础,也是未来机械设计的发展方向。     

单镜头大视场拼接成像方法及实现

在远距离目标轨迹测量系统中,当前的长焦相机由于CCD尺寸限制一般视场角度较小,无法实现对目标的可靠捕获。在对比当前的几种大视场拼接成像方法后,针对远距离目标测量系统的要求提出了一种通过控制单个相机进行圆锥旋转来模拟4相机阵列实现大视场成像的方法。设计了实验样机对该方法进行验证。首先根据该成像方法设计了相机运动控制方案和相应的机械结构,然后设计了相机的触发控制以及图像数据的传输和处理流程,最后使用该样机进行了实验。实验中样机经校准后采集到了相对位置正确的子视场图像,并拼接获得了大视场图像。使用视场角度为1.02°的小视角相机,实现了4个有一定程度重合的子视场2×2拼接,最终获得了1.93°的大视角。该方法为远距离目标测量系统中的目标捕获子系统设计提供了新思路。     

Massless links with external forces and bushing effect for multibody dynamic analysis

When the contribution of lightweight components to the total energy of a system is small, the inertia effects are sometimes ignored by replacing them to massless links. For example, a revolute-spherical massless link generates two kinematic constraint equations between adjacent bodies and allows four relative degrees of freedom. In this paper, to implement a massless link systematically in a computer program using the velocity transformation technique, the velocity transformation matrix of massless links is derived and numerically implemented. The velocity transformation matrix for a revolute-spherical massless link and a revolute-universal massless link are appeared as a 6X4 matrix and a 6X3 matrix, respectively. A massless link model in a suspension composite joint transmitting external forces is also developed and the numerical efficiency of the proposed model is compared to a conventional multibody model. For a massless link transmitting external forces, forces acting on links are resolved and transmitted to the attached points with a quasi-static assumption. Numerical examples are presented to verify the formulation.     

The optimization of attribute selection in decision tree-based production control systems

This study develops a learning-based production control system (PCS) to support a manufacturing system to make on-line decisions that are robust in the face of various production requirements. Selecting essential system attributes (or features) based on various production requirements to construct PCS knowledge bases is a critical issue because of the existence of a large amount of shop floor information in a manufacturing system. However, a classical decision tree (DT) learning approach to construct dynamic dispatching knowledge bases does not consider the optimal subset of system attributes in the problem domain. To resolve this problem, this study develops a hybrid genetic algorithm/decision tree (GA/DT) approach for DT-based PCS. The hybrid GA/DT approach is used to simultaneously evolve an optimal subset of system attributes and determine learning parameters of the DT from a large set of candidate manufacturing system attributes according to various performance measures. For a given feature subset and learning parameters of a DT decoded by a GA, a DT was applied to evaluate the fitness in the GA process and to generate the PCS knowledge base. The results demonstrate that the proposed GA/DT-based PCS has, according to various performance criteria, a better long term system performance than those obtained with classical DT-based PCS and the heuristic individual dispatching rules, according to various performance criteria.     

Identification of motion platform using the signal compression method with pre-processor and its application to siding mode control

In case of a single input single output (SISO) system with a nonlinear term, a signal compression method is useful to identify a system because the equivalent impulse response of linear part from the system can be extracted by the method. However even though the signal compression method is useful to estimate uncertain parameters of the system, the method cannot be directly applied to a unique system with hysteresis characteristics because it cannot estimate all of the two different dynamic properties according to its motion direction. This paper proposes a signal compression method with a pre-processor to identify a unique system with two different dynamics according to its motion direction. The pre-processor plays a role of separating expansion and retraction properties from the system with hysteresis characteristics. For evaluating performance of the proposed approach, a simulation to estimate the assumed unknown parameters for an arbitrary known model is carried out. A motion platform with several single-rod cylinders is a representative unique system with two different dynamics, because each single-rod cylinder has expansion and retraction dynamic properties according to its motion direction. The nominal constant parameters of the motion platform are experimentally identified by using the proposed method. As its application, the identified parameters are applied to a design of a sliding mode controller for the simulator.     

Practical phase identification by convergent beam electron diffraction

The purpose of this article is to present a practical guide to the identification of phases in the analytical electron microscope with the aid of convergent beam electron diffraction. There is included a step-by-step approach to phase analysis, from the possible choices of the form of the specimen through how to explore reciprocal space in order to perform a full phase identification, either by symmetry analysis or by simple comparison of a pattern observed in the microscope with a previously recorded pattern (fingerprinting). There is a strong emphasis on practical hints and useful shortcuts.