一种搬运机器人运动学仿真分析和实际应用

采用D-H方法建立了一种搬运机器人的连杆坐标系,详细求解了其运动学正解问题,通过ADAMS对该搬运机器人运动仿真分析,得到了机器人末端位置点的位移和角度,证明了其运动学模型的正确性;同时利用ADAMS对搬运机器人在实际应用中进行空间轨迹规划,指导现场调试,节约了现场调试时间。该搬运机器人解决了实际生产中对一定规格的重物以及有害物质搬运难的问题,从而提高了生产效率。     

Innovative Methods for the Investigation of Tool-Chip Adhesion and Layer Formation during Machining

Tool-chip and tool-work adhesion often limit machinability, but quantitative methods to characterise adhesion are absent. Hence, a methodology based on interrupted turning was used and layer formation was quantified using a number of techniques. This included surface topography studies using 3D white light interferometry, element mapping and profiling using SEM-EDS and Laser ablation time of flight mass spectrometry (LA -TOFMS) along with temperature mapping using IR-CCD. Results from turning tests with stainless steel 316L indicate clearly that the above techniques compliment each other and provide valuable new insight on contact friction, adhesion and layer formation.     

基于VERICUT多轴联动数控机床仿真加工效果对比与研究

加工仿真是虚拟制造的核心技术之一,为产品的可制造性提供关键数据,介绍利用VERICUT建立机床仿真模型的方法及过程,同时建立三、四和五轴联动数控机床模型,并对其加工效果进行比较,总结各数控机床的加工特点,为数控机床的选用和研究提供参考.     

Composite Machine Tool Structures for High Speed Milling Machines

To maximize the productivity in machining molds and dies, machine tools should operate at high speeds. However, the productivity of mold manufacturing has not increased significantly because CNC milling machines have massive slides, which do not allow rapid acceleration and deceleration during the frequent starts/stops encountered in machining molds and dies. This paper presents the use of composites for these slides to overcome this limitation. The vertical and horizontal slides of a large CNC machine were constructed by bonding high-modulus carbon-fiber epoxy composite sandwiches to welded steel structures using adhesives. These composite structures reduced the weight of the vertical and horizontal slides by 34% and 26%, respectively, and increased damping by 1.5 to 5.7 times without sacrificing the stiffness. Without much tuning, this machine had a positional accuracy of ± 5μm per 300 mm of the slide displacement.     

数控板料折弯机加工精度分析与优化

折弯机的加工精度是最主要的性能指标之一,由于板料折弯机结构原理、机床自身制造精度、模具加工精度、被加工板材性能以及机床性能不稳定等方面的原因,加工工件不可避免存在角度误差、直线度误差与边长误差。板料加工误差的存在影响后续的装配、加大试修模以及成形后校形的工作量延长了产品的开发周期,制约了自动化折弯进一步推广和应用。以某PBB型数控板料折弯机为研究对象,运用应变电测技术与有限元仿真相结合的方法对该型折弯机进行了优化与改进,在此基础上试制出一台PBH型样机,研究结果对提高金属板材的折弯精度与可靠性,提高产品的竞争力与附加值有着重要的现实意义。     

基于UG的高速雕刻机加工仿真系统的研究

应用UG软件IS&V模块,针对JZDK6040高速雕刻机,建立与实际加工一致的精确运动模型与加工仿真模型,对CAM生成的刀具轨迹程序进行模拟、校验和显示,监控机床、工件和刀具之间的碰撞干涉情况,有效避免实际机床加工过程中误切、过切等现象的发生。     

Innovative and Highly Productive Joining Technologies for Multi-Material Lightweight Car Body Structures

Driven by increasing costs for energy and raw material and especially by the European CO₂-emission laws, automotive industry faces the challenge to develop more lightweight and at the same time still rigid and crash-stable car bodies, that are affordable for large-scale production. The implementation of weight-reduced constructions depends not only on the availability of lightweight materials and related forming technologies, but also on cost-efficient and reliable joining technologies suitable for multi-material design. This article discusses the challenges and requirements for these technologies, based on the example of joining aluminium with press-hardened boron steels, what is considered as a very important material combination for affordable future lightweight mobility. Besides a presentation of recent developments for extending the process limits of conventional mechanical joining methods, new promising technologies such as resistance element welding are introduced. In addition, the performance, advantages, and disadvantages of the presented technologies are compared and discussed.     

虚拟制造中数控加工过程三维仿真技术的研究

以数控车床作为研究对象,探讨了加工过程仿真系统的理论方法及其关键技术,并以制造系统的仿真与建模理论为基础,结合计算机图形技术和仿真技术,开发了数控机床加工过程三维仿真系统。     

基于UGNX/IS&V的数控加工仿真

在介绍CAD/CAM开发软件UGNXIS&V的基础上,构建了基于UGNX/IS&V的数控加工仿真系统。实现了对刀具路径及机床运动的精确仿真,真实反映和再现了实际加工过程,减少甚至取消了机床的试切,极大地提高了生产机床的使用效率并降低了企业成本。通过具体实例实现了对铣削加工过程的实时仿真,获得较好的真实感效果。     

混沌-支持向量机在加工误差预测中的应用

提出将混沌-支持向量机模型方法应用于加工误差数据预测。利用互信息法和曹氏方法进行相空间重构,并运用小数据量法计算最大Lyapunov指数,对加工误差时间序列进行混沌识别。通过最小二乘支持向量机对历史样本的学习建立预测模型,并将其预测结果与RBF神经网络预测结果进行仿真对比。结果表明,在较少的加工误差数据条件下,该模型能够有效地描述和预测加工误差的变化,具有较高的预测精度。     

可重构冲压机械手的设计与运动学分析

利用模块化设计思想对可重构冲压机械手进行模块划分与设计,然后利用设计的模块组成一种常用的圆柱坐标式冲压机械手和一种利用夹具的折弯机械手,并以折弯机械手为例进行运动学分析,得到运动学正逆解。并利用CREO对折弯机械手的一次运动过程进行运动学仿真。仿真结果表明:该机械手可以完成物料搬运与制件折弯的任务,为冲压自动生产线提供了参考。     

模具曲面的C1连续刀具路径加工

模具曲面加工时,一种方法是采用C0连续刀具路径加工;本文论述了另一种方法即采用C1连续刀具路径加工。后一种方法得到的G代码NC文件更小,加工出来的曲面几何尺寸更精确,表面粗糙度更低,加工和抛光时间更少。     

机床结构件轻量化设计的研究现状与进展

随着高速加工技术的发展,机床结构件的轻量化成为保证加工精度和高速度的必然要求.现多集中于结构件的筋板设计,如优化结构参数、改进结构形式和替换传统材料等,并广泛采用计算机仿真建模、分析软件.此外,轻质高效的生物结构也逐渐被应用于机床结构件的仿生设计、改进中,并取得了一定的轻量化效果,为一般机械结构的轻量化设计提供了参考.     

并联运动机床现状与关键技术研究综述

随着社会的发展,并联运动机床技术迅速成为数控领域中的一个研究热点,具有广泛的应用和广阔的发展前景。简要介绍了国内外并联运动机床的研究背景及其发展现状,对并联运动机床的关键技术即数控系统实时控制模型、位置正反解和运动学分析分别进行了介绍,并对目前存在的主要问题和解决方法进行了探讨。     

数控机床进给运动对加工精度的影响

数控机床进给运动的精度对零件的加工精度有极大的影响。本文通过分析数控机床机械传动部件的特性,得出数控机床进给系统低速爬行的原因,并提出提高数控机床低速进给运动的平稳性和运动精度的措施。     

零传动滚齿机热变形对加工精度的影响

根据零传动滚齿机YK3610的工件主轴和滚刀主轴的设计结构,分析了其热源及热变形机理,以此为基础,分析热变形对滚齿加工精度带来的影响,并建立了误差的数学模型;最后提出了对热变形进行误差补偿的简单方法.     

Modeling and Identification of an Industrial Robot for Machining Applications

Industrial robots represent a promising, cost-saving and flexible alternative for machining applications. Due to the kinematics of a vertical articulated robot the system behavior is quite different compared to a conventional machine tool. This article describes the modeling of the robot structure and the identification of its parameters with focus on the analysis of the system's stiffness and its behavior during the milling process. Therefore a method for the calculation of the Cartesian stiffness based on the polar stiffness and the use of the Jacobian matrix is introduced. Based on the results of the identification and the experimental validation the machining performance of the robot is evaluated and conclusions are drawn.     

Tribological Characteristics and Cutting Performance of Lubricant Esters for Semi-dry Machining

In semi-dry machining, such as minimal quantity lubrication (MQL) machining, a very small amount of a lubricant plays an Important role to achieve a successful operation. This study investigates the tribological behavior of lubricants for semi-dry application in connection with their cutting performance. In MQL turning, synthetic biodegradable esters are superior to a vegetable oil and provide the satisfactory cutting performance compared with a conventional cutting fluid of flood supply. Their tribological action is further evaluated with the aid of tool surface analysis and the adsorption characteristics of a model ester are fundamentally examined using a controlled atmosphere machining apparatus.     

先进的模具加工设备与技术简介

介绍某厂近期引进的三套先进的模具加工、检测装备与技术：模具喷砂清理机，模具三维检测仪,模具加工中心.