Investigation of a measurement scheme based on IGES

The integration research of measuring machine and CAD information, just CMM/CAD integration technology, is far behind the information integration of mechanical processing and CAD. With the rapid development of information integration industry and in the manufacturing process of the parts with complex curve surface, it is crucial to integrate the measurement and machining procedures based on IGES as that IGES is a general ANSI standard of information exchange for CAD/CAM among different computer systems. The measuring path planning determines the realization of measuring each sampling point and the completion of all sampling points safely and effectively by using measuring equipment. Based on IGES in this paper, the calculation method of normal direction at the location of sample point is studied for different surfaces, so as to improve the measuring precision. Then the calculation strategy for the positioning points and the measuring range is established, and the identification method for the topological relation between surfaces is also researched for improving the measuring efficiency and security. At last, the measuring sequence of the sampling points to be planned reasonably based on TSP is given. It is believed that the research results can provide some useful contributions towards the development of automated inspection task planning and systems, especially for coordinate measuring machines.     

轧钢机动压轴承油膜补偿与临界轧速分析

采用有限元方法求解雷诺方程,对形成动压润滑的临界轧制速度以及影响板厚轧制精度的油膜厚度进行计算机数值模拟以评价不同轧制工况下油膜轴承的承载能力性特性参数。计算得出的不同轧速下厚预报值以及临界轧速一实际数据吻合。     

回转类零件 CAD/CAM 并行设计中的零件结构设计

主要介绍回转类零件基于ＣＡＤ／ＣＡＭ并行设计的零件结构设计方法，把参数化设计和特征拼合设计结合起来，以实现结构设计和制造信息的集成。文中叙述了基于特征的零件结构设计过程，参数化设计的基本方法，以及参数化结构设计结果向特征模型的转化的有关问题。     

超长胶带机远距离多电机拖动系统

介绍了超长胶带运输机的多台大电机拖动及控制系统。分析了该系统的工作原理及工作特点，最后介绍了它在水泥厂中的应用。     

CRT 屏锥曲面测量造型关键技术研究

根据我国新型阴极射线管（ＣＲＴ）的仿制需要,本文着重于ＣＲＴ屏锥曲面测量造型算法理论研究。通过Ｍ７６０三坐标测量机测得ＣＲＴ屏锥曲面数据后,提出了去掉测量数据坏点的预处理算法;采用数据匀化,消除了屏锥曲面局部病态,并给出屏锥曲面分块合理准则。基于ＣＲＴ屏锥曲面光顺概念和设计要求双重考虑,选用局部回弹光顺法,有效地解决了屏锥曲面的光顺问题。     

高速加工机床及其关键技术

介绍了高速加工机床的发展现状。对高速机床的几个主要关键技术—高速主轴单元、高速主轴支撑轴承、直线电机进给驱动系统、高速机床控制系统以及高速加工刀具进行了讨论。     

生产环境下变速器壳体号码图象自动识别预处理算法

论述了汽车变速器壳体号码识别中的预处理过程。提出了适应生产现场的预处理流程及其衡量各环节中各算法好坏的评判依据。并为各预处理环节确定了较为实用的算法。     

检测水中含油浓度的传感器研究

】根据光的散射规律和水中含油浓度的检测特点,论述了水中含油浓度检测传感器和水中含油浓度的测量电路的设计原理和工作原理,提出了检测传感器设计中的若干关键性技术问题的解决方法和几个管理要点。     

工程陶瓷超高速磨削过程的动力学特性分析

在设计转速为314 m/s的超高速磨削试验台上, 比较研究了氧化锆和氧化铝材料在不同磨削条件下的磨削过程,得到了如下主要研究结果:(1)不能单以振动强度大小判断磨削过程的稳定性和工件表面磨削质量的优劣,而需要结合陶瓷材料力学性能、材料去除机理、砂轮磨粒和接触刚度等因素综合考虑;(2)磨削过程可激发机床的高阶固有频率模态振动;该振动频率远高于主轴转动频率,且与主轴转频无明显的倍速关系;(3)在较低速度时,由于磨削粘性及电动机低速转矩特性原因,磨削过程可能不稳定,从而导致工件表面质量下降;随着砂轮线速度的增加,强迫振动占主导地位,但由于砂轮动平衡精度高,实际振幅小,磨削过程稳定,工件表面质量反而提高;当磨削速度进一步提高时,受机床结构刚度的限制,工件表面质量又呈下降趋势.     

Development of measuring system for radial non-repetitive run-out (NRRO) and perception about present state of angular contact ball bearing for machine tools

This paper deals with the non-repetitive run-out (NRRO) of an angular contact ball bearing for machine tools. First, a measuring system for the rotational accuracy of the bearing was developed. Then, the following results were obtained using the developed measuring system.

(1)

The NRRO of ball cage rotation increased with rotational speed.

(2)

The influence of form errors in the inner and outer rings on NRRO was small.

(3)

The influences of form errors in the balls of the bearing and the diameter difference of balls on NRRO were significant.