Force Modelling for Cylindrical Plunge Cutting

This paper described the development of an analytical model for the cutting forces in multiblade plunge cutting of cylindrical parts. The development uses the relationship between the instantaneous chip area and the local cutting forces at each individual blade to formulate the total resultant forces via kinematic integration along the cutting edges. The model expresses the cutting forces in explicit terms of part material properties, cutter geometry, part geometry, and cutting conditions. Experiments were performed under various cutting conditions to verify the fidelity of the model at different stages of cutter-part engagement. The waveform and amplitude characteristics of the model-predicted forces agree closely with the measurement. The model can facilitate tool geometry design and cutting condition planning in light of the optimisation of cutting forces.     

Analysis of Reactions and Minimum Clamping Force for Machining Fixtures with Large Contact Areas

This paper presents a model for analysing the reaction forces and moments for machining fixtures with large contact areas, e.g. a mechanical vice. Such fixtures transmit torsional loads in addition to normal and tangential loads and thus differ from fixtures using point or line contacts. The model is developed using a contact mechanics approach where the workpiece is assumed to be elastic in the contact region and the fixture element is treated as rigid. Closed-form contact compliance solutions for normal, tangential, and torsional loads are used to derive the elastic deformation model for each contact. A minimum energy principle is used to solve the multiple contact problem yielding unique predictions of the fixture–workpiece contact forces and moments due to clamping and machining forces. This model is then used to determine the minimum clamping force necessary to keep the workpiece in static equilibrium during machining. An example is given to demonstrate its effectiveness in analysing the clamping performance of a mechanical vice during machining.     

国外服务机器人的发展动态和前景

本文主要介绍了服务机器人的定义、特点和应用,并且给出了一些国外目前已经商业化了服务机器人实例,提出了服务机器人发展应注意的一些技术和服务机器人的应用前景。     

基于双机器人快速原型制造系统的CAD/CAM接口技术研究

用ＪＡＶＡ语言进行了基于机器人快速的型制造系统的ＣＡＤ／ＣＡＭ接口技术研究,详细分析了在该系统中的二维图形数据提取与整技术,并说明了它的实用意义。     

敏捷化计算机辅助工艺规划系统探究

根据敏捷制造的特点 ,提出了动态联盟环境下工艺规划系统的模式 ,分析了敏捷制造企业中工艺规划活动的特点 ,在此基础上提出了敏捷化计算机辅助工艺规划系统(ACAPPS)的特性 ,对开发ACAPPS的关键技术进行了探讨。     

长光栅旋转测角法的研究

本文介绍了一种长光栅副相对旋转测角的新技术。建立在付立叶光学理论基础上的分析与实验结果是一致的。采用本方法与现代微机技术相结合,可以用非常简单的结构实现对小角度的高精度测量。仪器测量范围为±30′,测量精度为±0.5″。     

用PLC快速构造工业机器人控制器

本文介绍了用ＰＬＣ快速构造工业机器人控制器的方法。这个方法具有减少 件和软件研制难度的优点。研制周期得以缩短。结果表明,用ＰＬＣ构造的机器人控制器是极为可靠的。     

解球罐模糊失效概率的减少方差抽样法的探讨

减少方差法是提高蒙特卡洛抽样效率的方法。本文结合实例分析了三种不同的计算方法用于计算球罐模糊失效概率 ,其计算效率都高于直接抽样法     

超低频移相信号发生器的设计

介绍一种基于微控制器的超低频移相信号发生器的工作原理和设计方法。系统 采用了微控制器和数字波形合成技术,具有数字控制输出信号的频率、幅值、波形和信号之 间的相位差等功能。该信号发生器输出信号的频率范围为０．０００１～９９９．９Ｈｚ,幅值的峰－峰 值为０～２０Ｖ可调,波形可以从正弦、三角、锯齿、方波或其他周期函数信号中选择,输出的 两路信号之间可以实现０°～３５９°的相位差。实际应用表明,该信号发生器具有稳定性好和 调节精度高等特点,具有广泛的应用前景。     

RS—422接口芯片在单片机系统中的应用

介绍ＲＳ－４２２串行通讯接口芯片ＭＡＸ１４９０的性能特点,并结合实例给出了在线单片机加装ＲＳ－４２２接口时的应用,最后给出其串行通讯程序。