圆孔拉刀优化设计及CAD

在对圆孔拉刀的结构参数分析的基础上，建立数学模型。采用惩罚函数法进行优化，编制优化程序，得到了优化参数，运用CAD对拉刀其他部分进行程序设计。     

糖厂用连续离心机的改进

本文主要介绍糖厂现用连续离心机的传动机构、阻尼吸震、物料加温、均布、机壳结构、物料分离密封、润滑系统及机座等主要部件的改进及其应用效果。     

A Study on the Drive at Center of Gravity (DCG) Feed Principle and Its Application for Development of High Performance Machine Tool Systems

For high performance machining, it is essential to minimize the vibration of a machine tool, which is incurred due to the instantaneous acceleration/deceleration. To minimize this vibration, it is fundamentally ideal to apply the driving force at the most shock-insensitive position of the moving structure: the center of gravity. Aiming at developing unparalleled high-performance machine tool systems, the effectiveness of the Drive at the Center of Gravity (DCG) principle on vibration reduction has been studied thoroughly by analytical and experimental approaches. Based on the results obtained, a new design of the high-performance machine tools has been discussed with a special focus on the installation of DCG mechanism without sacrificing any advantages already obtained in the recent basic design rules. The paper also describes the comparative study between a machine tool based on the DCG principle and the one with a conventional driving configuration. The results obtained have shown a distinctive performance difference in machining stability.     

YG8材料ELID磨削过程中法向磨削力的研究

在线电解修整(Electrolytic In-Process Dressing,ELID)磨削方法由于其高效的镜面磨削效率而被广泛应用于硬、脆性材料的镜面磨削加工。在精密平面磨床上加装喷嘴电解ELID磨削系统,进行了硬质合金材料YG8的ELID磨削试验研究。实验分析了磨削力与输出电压、脉冲频率、脉冲电流占空比、砂轮转速、工作台进给速度及磨削深度等ELID磨削工艺参数变化的影响关系。同时,在相同的磨削参数下,对ELID磨削和普通磨削条件下的磨削力进行对比分析。试验结果表明:ELID磨削能明显降低磨削力,与普通磨削相比较,能更好地实现YG8的超精密磨削加工。     

Adaptive preloading for rack-and-pinion drive systems

In the field of machine tools, rack-and-pinion drive systems are one of the commonly used feed drive systems. In order to achieve the high accuracy specifications of modern production facilities, these drives are electrically preloaded to reduce backlash in the drive train. In most cases, the preload is fixed, even though the method of electrical preloading allows adjustment during operation.This paper describes a novel approach – called adaptive preloading – to adjust preload during operation. The objective is to increase the drive system’s energy efficiency by continuously adapting the preload, which is minimally required for maintaining the drive system’s accuracy.     

糖蜜味精废水饲料化的生产实践

主要介绍了利用糖蜜味精废水采用干燥法试制速溶蛋白产品的依据及其禽畜饲养效果，并对存在问题进行了讨论。     

数控机床进给系统静动热分析知识库研究

鉴于数控机床进给系统静动热分析知识量巨大、知识类型复杂和知识技巧多变的特点,进行了数控机床进给系统静动热分析知识库框架结构模型的建立,并在此基础上用面向对象的方法、面向对象的产生式规则方法和流程图和文本相结合的方法进行了相关知识的表示,进而运用知识获取模型1和知识获取模型2进行了知识的获取。     

一种S波段高功率微波馈源系统的设计

在高功率微波辐射技术中,馈源系统是天线系统的最终功率容量限定因素,因此高功率馈源系统的设计成为关键。本文设计了一种S波段高功率微波天线的馈源系统,该系统由双模圆锥喇叭和矩-圆模式转换器两部分组成。理论设计与电磁仿真和实际测试的结果基本吻合,E面和H面方向图在照射区域内等化良好(误差电平≤1dB),功率容量达到150MW,且该馈源系统已成功应用于7.3m卡塞格仑高功率微波天线。     

基于预滑—动态摩擦力矩估计模型的自适应前馈补偿方法

根据数控交流伺服工作台进给系统从静止到宏观运动的过渡时间,和零速度时刻的指令加速度大小呈反比关系,区分摩擦力矩的预滑动区和滑动区,由此提出基于力矩值估计的摩擦补偿方法;在设定指令加速度后,基于命令力矩值的摩擦力矩模型,不需要测量速度就可以补偿工作台进给系统中的摩擦。同时,考虑到参数的不确定性,设计非线性摩擦自适应控制方案,对其稳定性进行理论证明。在交流伺服工作台进给系统上对基于摩擦力矩值估计的自适应前馈补偿方法进行验证。试验结果表明,基于预滑—动态摩擦力矩估计模型的自适应前馈补偿方法能实现在不同指令加速度下对期望轨迹的跟踪,并能大大提高系统的跟踪精度。     

本钢2300mm热轧AWC控制简析

全面、系统地对本钢2300mm带钢热连轧生产工艺过程中,带钢宽度控制的起因以及影响最终产品宽度的要素进行了介绍,并对当前使用的自动宽度控制系统的设计进行了介绍,给出了控制系统原理图、可实现的程序框图及控制策略应用。结果表明,该方法能有效地控制产品宽度。