微小型车铣加工表面粗糙度正交试验研究

铣车转速比、工件转速、轴向进给量以及切削深度是车铣加工中相对独立的四个重要切削参数.运用正交试验法研究微小型零件车铣加工表面粗糙度与上述四因素的关系.试验数据分析结果表明,该四因素对表面粗糙度的影响程度从大到小依次为:铣车转速比、轴向进给量、工件转速、切削深度.而且转速比的提高对粗糙度值的影响是单调的,转速比越高粗糙度越低.这一结论也与单因素试验结果相吻合.由试验结果分析还得到各切削参数的优化匹配关系.     

Design method and vibration testing of a reconfigurable multi-process combined turn-milling machine tool

To provide a good machining method in remanufacturing for the repaired parts with various forms,the design method of reconfigurable multi-process combined machining system and its implementation technology for remanufacturing are systematically proposed.The key technologies include reconfigurable structure design method of multi-process combined machining,man-machine coordination parameter programming and control system technology with self-maintenance function.A turn-milling machine tool based on this design method is developed.Natural frequency and corresponding vibration modes of the machine tool were analyzed by using both FEA and vibration test.Stiffness tests and machining experiments show that the rapid machining of most processes for the repaired work pieces can be successfully realized.     

面向再制造的快速机加工系统设计与研究

本文主要讨论了再制造快速机加工系统的设计和实现方法。首先介绍了面向再制造快速机加工概念和加工流程,并针对战地现场再制造的快速性、可靠性等特点,以轴类零件为例论述了再制造模型快速比对方法、模块化程序生成算法 提出了适用于本系统的快速人机协同工艺辅助方法。在快速机加工装备方面,介绍了可重配置机床和可重配置控制系统的概念,并简单论述了其总体设计方法。     

基于曲面约束匹配算法的装配仿真定位方法

随着工业科技的发展,现代制造业对零部件的装配精度提出了更高的要求,要求从系统制造的早期阶段预测最终产品的精度与性能,这有利于提高装配合格率、一致性及精度稳定性。在精密零件真实模型的装配仿真过程中,确定零件模型的装配定位是进行装配精度预测与控制首要解决的问题,其本质是两个带有几何误差的配合表面的精确匹配。提出一种基于曲面约束匹配算法的装配仿真定位方法,并通过试验验证,零件装配定位的预测值与实测值的相对误差在10%以内。该方法是准确有效的,具有很好的计算精度,可以快速准确地在真实接触状态下分析和验证装配出的产品是否符合精度要求,为产品的装配分析和公差设计提供良好的校验、反馈功能以及可视化手段。     

回归分析在脉冲电流电解加工中的应用

论述了脉冲电解加工过程中加工参数与精度评价指标之间的定量关系问题，先通过正交试验方法进行试验，然后对所得到的试验数据采用逐步回归分析进行分析，最终得出加工工艺参数对加工精度度评定指标的最优回归方程。     

Anovel profile error model to calculate contact error

A new profile model based on multi-scale asperities is developed and contact error is calculated.After stratified sampling, the model can get the distribution law of entity points on each cross section.Asperity radius of curvature is estimated by the relationship between circle radius and the section interval. Contact error is related to surface form error. A model equation of contact error plane is calculated through a method based on static equilibrium theory. Three contact asperities which determine the contact error plane on the rough surface are studied. The simulation results show that contact error can be accurately calculated according to the profile error model.     

显微视场下微型零件亚像素边缘检测方法

为了提高微型零件在显微视场下的边缘检测精度, 提出了一种非正交二次B样条小波变换结合Zernike矩的亚像素边缘检测算法. 采用非正交二次B样条小波变换算法得到图像的像素级边缘, 利用Zernike矩算法的矩不变性对像素级边缘进行亚像素边缘细化. 为了实现算法的原理, 建立了一套微型零件的实时检测系统. 给出了系统的总体结构和工作原理, 完成了实时图像采集与检测, 分析了检测结果, 并对检测精度进行了评估. 实验结果表明: 该系统检测零件尺寸可以达到0.01~10 mm, 检测精度可以达到0.01%~0.1%, 可准确识别出微型零件的边缘, 将检测精度提高到亚像素级, 满足了在显微视场下微型零件检测的需要.     

Research on Maintenance Information Management System for Distributed Manufacture System

An architecture and design of a maintenance information management system for distributed manufacture system is presented in this paper, and its related key technologies are studied and implemented also. A frame of the maintenance information management system oriented human-machine monitoring is designed, and using object-oriented method, a general maintenance information management system based on SQL server engineering database and adopted client/server/database three-layer mode can be established. Then, discussions on control technologies of maintenance information management system and remote distributed diagnostics and maintenance system are emphasized. The system is not only able to identify and diagnose faults of distributed manufacture system quickly, improve system stability, but also has intelligent maintenance functions.     

新型阻尼橡胶圈的动态特性测试

利用基础激振、共振质量法设计了专用的实验系统,对新型阻尼橡胶的动态特性进行了测试,获得了阻尼橡胶刚度系数、阻尼系数以及损耗因子等特征参数值,并分析了特征参数与使用频率之间的对应关系.     

基于等效弹性模量的压电双晶片微夹钳夹持力检测方法

为保证压电双晶片微夹钳能稳定且安全无损地夹持零件,提出一种基于等效弹性模量的压电双晶片微夹钳夹持力检测方法。依据等效弹性模量理论提出夹持力计算模型,提出夹持力检测方法,通过先行实验测定所选压电双晶片的等效弹性模量等少量参数来计算夹持力,以自行研发的宏微结合压电双晶片微夹钳为对象进行夹持力检测实验。实验结果表明,该方法具有良好的夹持力检测精度。