用于Micro-EDM放电状态分类的多传感器集成与信息融合系统

在Ｍｉｃｒｏ－ＥＤＭ（微细电火花加工）中,由于加工信号的频率高、加工波形的畸变,使得常规的用于放电状态检测的方法,如电压波形采样、放电延时等,已不再适用。利用多传感器的信息融合进行目标识别,可以避免单一传感器的局限性,减少各传感器不确定性的影响。文中描述了一人用于目标识别与分类的基于模型的多传感器系统。该系统选用以决策层为主的方法,以模糊神经网络作为其信息融合的工具。体现了多传感器信息融合优越性。     

PLC高速计数模块在数控装置中的应用

本文主要介绍了PLC高速计数特殊功能模块在数控装置中的应用实例,分析了控制系统的基本原理,同时也对控制编程的要点进行了相应的介绍和分析,该实例具有一定参考价值。     

基于反射的机床整机动态性能测试系统研究

针对传统机床整机动态性能测试架构高成本、可测对象单一、分析方法有限等问题,提出一种基于反射的对象关系映射与插件技术的机床整机动态性能测试架构,该架构可降低测试成本、扩展测试对象和分析接口方法的种类.基于该架构实现对西门子840D系列数控系统的圆测试、主轴测试、通用轴测试和恒速轴测试等测试与分析.通过对比实验验证了该系统的测试效果和完整性.     

数控机床RTCP精度的分析

RTCP精度是五轴联动数控机床的重要精度指标.本文是基于西门子840D数控系统,结合航空大型结构件加工企业高档五轴数控加工中心的实际情况,分析并总结出一套数控机床RTCP精度的检验与补偿的方法.     

三弧段型面联接的数控加工

论述了三弧段型面曲线的形成及其曲线参数方程,编制了三弧段型面的数控加工宏程序,适用于各种不同参数的三弧段型面的加工,且能够满足加工精度的要求。     

Molecular Dynamics Simulation for Ultrafine Machining

This article surveys the advances of molecular dynamics (MD) simulation in the research of ultrafine machining and related technologies. Modeling methods, including interatomic potentials and boundary conditions, are addressed. Algorithm strategies for MD simulations are discussed. By applying simulations with Tersoff potential, a case study of the material removal mechanism of the polishing based on coupling vibrations of liquid (PCVL) is presented.     

利用曲面曲率划分的高速数控加工进给速度修正

为保证数控加工中的切削效率和机床运动的平稳性,提出了基于曲面曲率划分的进给速度修正方法。以最大工作进给速度的变化比率为阈值,把零件表面的法曲率半径划分为不同的区域;在不同的曲率区域内,分别以恒定的刀触点速度对进给速度进行修正,修正后的进给速度随着零件表面曲率的变化而自适应变化;实例表明该方法具有合理性和有效性。     

GH2132合金质量问题分析与讨论

通过对GH2132合坌缺陷试样经过金相观察和电子探针分析，确定了斌缺陷属于含W较高的异金属夹杂，并且是在用户的机加工工序中产生的。我公司交付的产品是合格的。     

Heat regulating strategy in numerical control end milling for hard metal machining

The trend in die/mold manufacturing at present is towards the hard machining at high speed to replace the electron discharge machining. Failure forms of the A1TiN-coated micro-grain carbide endmill when used for the machining of/IS SKD61 (HRC 53), a widely used material in die/mold manufacturing, are investigated. The endmill shows a characteristic that tool life decreases greatly due to the chipping when overload occurs or the rapid increase of wear when over-heat accumulation in cutting edges. As a consequence of the investigation, a strategy to regulate heat generation in the end milling process is proposed. This is accomplished by controlling the cutting arc length, i.e. the length of each flute engaging workpiece in a cutting cycle. Case studies on the slot end milling and comer rounding are conducted. The results show that the proposed strategy suggests the optimal tool path as well as the optimal pitch between successive tool paths under the cutting time criterion.