New approach in tool wear measuring technique using CCD vision system

This paper suggests a reliable direct measuring procedure for measuring different tool wear parameters. Modern image processing techniques and machine vision systems today enable direct tool wear measurement to be accomplished in-cycle. The presented system is characterized by its measurement flexibility, high spatial resolution and good accuracy. The system consists of a light source to illuminate the tool, CCD camera, laser diod (used in conjunction with profile deepness assessment) with linear projector, grabber for capturing the picture, and a PC. The technique is specially characterized by its determination of profile deepness with the help of projected laser raster lines on a tool surface. So it has advantage comparing with other techniques, which can measure only 2D profiles. With the technique presented in this paper a 3D image of relief surface can be obtained without having need to employ a very complicated measuring system. All indirect methods like acoustic emission, force measurement, spindle current measurement, vibration sensors, etc. are very time consuming and demand very expensive subsidiary measurement equipment, compared with the method presented here.     

Adaptronic Vibration Damping for Machine Tools

A newly designed adaptronic component with a powerful piezo-stack actuator for active damping of machine vibrations is presented in this paper. Especially for machine tools with parallel kinematics, which feature lightweight structures and which are built in order to obtain high processing speeds, the active damping of machine vibrations is important to achieve the desired system performance. Extensive simulation studies with flexible multibody systems in order to test different control algorithms such as dissipative control, integrated force feedback or H₂/H_∞ control and recent experimental results show the high potential to improve the system behavior.     

卧式加工中心试验模态分析

应用变时基采样的锤击法对卧式加工中心进行了试验模态分析，研究了该加工中心的动态特性，获得了感兴趣低频段的加工中心低阶固有频率。通过对整机各阶模态振型的分析，找到了加工中心结构的薄弱环节，为进行结构的优化设计指出了改进的方向。     

CPLD在万能试验机控制器中的应用

文章对现场可编程门列(CPLD)在万能试验机控制器中的应用方面作了一些探索，以此来满足要求的精度等方面的特殊性。CPLD集成了A／D、D／A、计数器、串口通信等功能。     

电动汽车车载永磁同步电动机转子位置自检测算法

永磁同步电动机由于其自身的众多优点,在现代电动汽车上得到了越来越广泛的应用.文章介绍了一种采用增量式码盘和转子磁极初始位置辨识算法相结合的方法来实现永磁同步电动机转子位置的自检测.这种方法可以应用在隐极式同步电动机上,实现在无位置传感器的条件下确定电动机转子的绝对位置,并且简单、有效,受电动机参数变化的影响比较小,在电动机静止、低速和高速运行时都可以正常使用.利用MATLAB/Simulink软件建立了这种方法的仿真模型,仿真结果证明了该方法的可行性和有效性.     

机床铸件导轨镶铸冷却水管的工艺技术

机床铸件导轨镶铸冷却水管是一项新技术,介绍该技术的试验开发过程、铸造工艺参数的设计、生产过程的铸造工艺规范,本试验开发项目的成功将促进镶铸技术在机床铸件上的应用.     

高强度冷矫直机机架结构优化分析

高强度冷矫直机机架由上横梁、立柱、底座用四根拉杆联结而成,对四根拉杆施以预紧力,使之成为预紧机架。由于底座和立柱都采用了薄壁结构,机架的局部变形对整体刚度影响较大,为了使机架具有较高的刚度,结合有限元分析技术对该矫直机机架进行了三维有限元分析及结构优化分析,取得了较好的效果。     

摩托车ZAlSi11Cu2MgMn壳盖压铸模的设计

根据铝合金壳盖铸件形状复杂、壁薄、外形尺寸小等特征,选用了J1125型卧式冷室压铸机。模具结构采用1模4腔。为了使之成形良好,设计了一个截面变形均匀且尺寸不大的主横浇道和4个对称分布、宽度逐渐变大、截面突然变窄的过渡横浇道,从而优化了压铸模具结构。     

铁环压脱机液压系统及其控制的研究

铁环压脱机是电解铝组装车间一种必需的设备,由于铁环硬度非常大,对液压系统要求较高,文章中给出了铁环压脱机中的液压系统的设计。同时介绍了电机启动的控制电路及系统电气控制。     

Calibration system based on a laser interferometer for kinematic accuracy assessment on machine tools

This paper deals with a method for the dynamic calibration of the kinematic accuracy of lathes and thread grinding machines in screw-cutting mode but free of load. It utilizes a precision polygon mounted on the spindle, in conjunction with a trigger device to generate angular pulses. A laser interferometer system assesses the longitudinal position of the saddle with respect to a cube-corner affixed on the chuck. As the spindle rotates, a string of pulses is generated by the angular trigger device. These pulses are used for triggering the laser interferometer. A software package has been elaborated to enable on-the-fly data acquisition and to display the kinematic errors in graphical form. The components of the kinematic error considered are the progressive pitch error, the cyclic error and spindle-free float. Application of this kinematic error calibrator on a universal and a CNC lathe has been carried out. Test results are presented and commented.