JFE443CT高纯铁素体不锈钢的焊接性能

公司部分产品只要求耐大气腐蚀，以前我们对这些产品均采用18-8型奥氏体不锈钢，这样产品虽能达到设计要求，但随着不锈钢材料价格的上涨，零件的成本也越来越高，造成了一定程度上的“浪费”。为使产品设计、制造达到最佳性价比，我们选用日本JFE钢铁株式会社生产的JFE443CT高纯铁素体不锈钢替代18-8奥氏体不锈钢进行焊接性能试验。     

工业设计专业产品形态设计课程教学内容设置探讨

产品形态设计是工业设计专业的一门非常重要的专业核心课程,但由于开设时间较晚等原因其教学内容并未发展成熟,指出了工业设计专业产品形态设计课程要解决的两大核心问题,即什么样的形态是好的产品形态以及怎样设计好的形态,从而引出课程的两大内容板块,即“课程知识体系”板块和“产品形态设计方法”板块,并重点就“课程知识体系”板块所应...     

京瓷推出加工效率与寿命达原来2倍的加工工具

日本京瓷公司正在开发加工效率与寿命提高到原来产品2倍左右的钢加工工具“CA5515”与“CA5525”，定于2005年1月下旬上市。面向高可靠加工的CA5515重视耐缺损性，面向长寿命加工的CA5525重视耐摩损性，均可以降低加工时的总成本。     

笼式单座调节阀的设计与专利结构解析

解析了多项专利、多方位创新和保护的调节阀新品种—笼式单座阀的设计思想及其专利结构。本文通过对调节阀的“功能-结构”解析以及对传统单座阀、笼式阀的“优-劣”结构比较,将单座阀、笼式阀两者特点合二为一,整合成一个产品。整合后的笼式单座阀性能远远优于整合前的单座阀、笼式阀,而生产成本又大幅度下降,性价比高。本文还介绍和纠正了传统调节阀设计中的许多误区和错误,对提升国产调节阀设计水平有所帮助。     

机械工业产品的绿色设计研究

随着人们对环境保护提出越来越高的要求,更加注重产品的“绿色”指数。本文通过对机械产品绿色设计的含义、特点、关键技术及典型设计方法的分析,提出了产品绿色设计的设计要点。     

轧辊压下装置的改进

以可靠性理论为指导,通过简化结构、降额设计、提高产品的耐环境能力等改进措施,解决了550H轧辊压下蜗轮传动装置动作不灵、维护和检修频率高的问题,保障了产品的可靠性.     

汉川TK6411B卧式数控镗铣床

汉川机床集团有限公司是中国机床工具行业的重点企业．专业从事机床产品研发、设计、制造及销售．具有四十年生产精密机床的历史。公司产品主要有各式加工中心、数控铣床、数控镗铣床、数控钻床、卧式镗床、电火花成型机、电火花切割机等．这些产品以”技术高、质量优、服务好”赢得了市场．成为广大客户心目中的名牌．畅销国内外市场，深受广大客户的欢迎。     

产品形态设计中的心理学因素分析

产品形态设计是工业设计中的一个重要环节,通过对产品形态设计中的心理学因素的分析,揭示出产品形态设计的关键,即如何体现“形式服从情感以及体验”.通过相关的设计案例分析,提出产品形态设计应遵循的原则,为产品形态设计提供新的思路.     

铝阳极氧化产品标牌

铝阳极氧化产品标牌(以下简称“氧化标牌”)系采用纯铝或铝合金作基材,经阳极氧化处理,采用引进特种渗透印刷工艺加工而成的标牌,具有耐盐雾、耐湿热、耐     

创新:洛建撬动市场的支点

近些年,随着国家对公路建设投资力度的加大,已有几十家工程机械企业进入压路机制造行列,而“洛阳”牌压路机以其水平高、质量优、服务好,产品先后销往欧、美、亚、非及澳洲等87个国家和地区。产品技术创一流纵观我国压路机的发展史,一方面是一拖(洛阳)建筑机械有限公司(以下简称洛     

Comparative influence of three flexibility types on manufacturing lead-time performance

This paper presents the results of a conceptual study and simulation experimentation aimed at understanding the impact of three important types of flexibility on the lead-time performance of a manufacturing system. The three flexibility types, viz. transformation flexibility, sequencing flexibility and product flexibility have been identified based on a new conceptual model for flexibility in manufacturing systems and supply chains. The influence of these three flexibility types has been studied using simulation models. The studies indicated that among the three, product flexibility has the greatest influence followed by transformation flexibility and the sequencing flexibility. The reasons for the inferior performance of sequencing flexibility is found to be reduction of dynamic flexibility levels as compared to its static flexibility levels and the reasons for superior performance of product flexibility is found to be the lower movement of products within the manufacturing system.     

新型硅青铜ZCuSiPbMnFe的试验研究

主要描述了新型硅青铜的成分设计,以及锡青铜与新型硅青铜的性能对比。通过对比可知:新型硅青铜的机械性能、耐磨性能和抗蚀性能均优于锡青铜(ZCuSn6Zn6Pb3),新型硅青铜(ZCuSi3Pb3Mn1Fe)在耐磨材料的应用中可以替代锡青铜。     

基于Powerlink与UKF算法的异步电机矢量控制系统参数辨识研究

针对异步电机矢量控制系统参数辨识算法时间复杂度高,难以满足在线辨识要求,及基于网络的电机群控系统上位机计算能力浪费严重等问题,提出基于工业以太网Poweflink与无轨迹卡尔曼滤波算法的参数辨识方法,并以转子电阻辨识为例作了说明。系统性能分析与实验结果表明,这种将参数辨识算法放于上位机处理的方法,可以在现有硬件条件基本不变的情况下满足对电机进行高性能控制的要求。     

Ductility and the abrasive wear resistance of hot work die steels

Two-body abrasive resistance has been determined as a function of tempering temperature for a conventional hot work die steel and two experimental hot work die steels. After tempering in the secondary hardening range both experimental steels exhibit abrasive wear resistance comparable with or superior to that of the conventional die steel. In addition, the abrasive wear behavior of the three steels has been assessed using an approach suggested by one of the authors which emphasizes the role of ductility in determining abrasive wear resistance. As suggested by that approach, the product of the wear ratio and the bulk hardness tends to decrease with increasing tensile strain to fracture.     

Physical properties and cutting performance of silicon nitride ceramic

Silicon nitride, a nitrogen compound of highly covalent bond character, has low density, high hardness, low thermal expansion and high thermal conductivity and excellent oxidation and corrosion resistance. Therefore it is considered to be a promising material for high temperature engineering components.However, it has very poor sinterability compared with the conventional oxide ceramics owing to its low self-diffusivity. By investigating starting materials, sintering additives and processing, a hot-pressed silicon nitride ceramic having grains enveloped by crystalline boundary phases can be produced.The silicon-nitride-based ceramic has high strength, high Weibull modulus, fracture toughness and thermal conductivity, and low thermal expansion compared with existing cutting tool ceramics such as Al₂O₃ + TiC, and it is expected to have superior thermal shock resistance.This new ceramic cutting tool shows superior performance in cutting cast irons at high speeds (10–16.75 m s^?1 (600–1000 m min^?1)) and rates (about 1.0 mm rev^?1), where conventional tools cannot be used.     

高粘附性钢丝绳脂的研制

以不同黏度矿物油为基础油体系,以高分子含氮类化合物及微晶蜡为稠化剂体系,固体磺酸盐及硼酸盐为添加剂体系,制备一种高黏附性能钢丝绳脂产品。通过典型数据对比及产品现场应用表明:该产品具有良好的高低温黏附性能、防锈性能、抗水性能及极压性能,能够满足环境温差大、防护要求高、高负荷以及高速运转的钢丝绳的使用要求。     

A new high-stability synthetic phosphate ester

Neutral phosphate esters are used as fire-resistant basestocks in several applications including hydraulic systems, turbines, and compressors. They are also used as grease basestocks, and in hydrocarbon-based lubricants and synthetic fluids as antiwear additives. Development aspects of a new synthetic triaryl phosphate ester is presented in this paper. This product provides superior hydrolytic stability and lower volatility than existing commercial phosphate esters. Additionally, it has excellent oxidative stability and is fire resistant. The performance characteristics of the fluid suggest use of this phosphate ester as a high stability antiwear additive or lubricant basestock, and in any application where stability is of primary importance.     

高刚重比天线结构刚强度优化设计与分析

天线的发射和接收性能取决于反射面的形面精度,而结构刚强度是决定天线反射面形面精度的主要指标,因此对天线结构进行优化设计非常必要。文中提出了一种具有高刚重比的车载天线结构,采用ANSYS有限元分析软件对天线自重、抗风载荷和振动载荷性能进行了力学仿真分析。仿真结果表明,井形背架结构和桁架形背架结构均可为反射面提供高刚度的结构支撑,桁架形背架结构在强度方面优于井形背架结构,其最大应力值比井形背架结构的最大应力值小43.8 MPa,从而验证了该高刚重比车载天线结构优化设计的合理性和可靠性,可为同类型天线的设计提供理论支撑。     

基于自适应差分进化算法的三轴光电跟踪策略

为解决传统两轴光电跟踪系统的跟踪盲区问题,实现空间目标的全方位跟踪,提出一种存在冗余自由度的三轴光电跟踪系统。在详细分析三轴光电跟踪系统运动学特性的基础上,运用四元数方法建立三轴光电跟踪系统运动学模型,并提出一种基于自适应差分进化算法的三轴全方位光电跟踪策略。通过对系统运动学模型进行分析,得到三轴转动角度之间的关系,从而将求取三轴转角增量组合的三变量优化问题简化为单变量优化问题,并将自适应差分进化算法应用于求取三轴角增量的最优组合当中。仿真和试验结果证明,此三轴光电跟踪策略避免以往三轴跟踪系统在跟踪过程中进行两轴切换的不连续性,可以真正实现系统的三轴联动全方位连续跟踪运动;同时,与现有的其他跟踪策略相比较,该三轴跟踪策略能够以更小的三轴转动角度实现目标的跟踪定位;因而提高了系统的快速性和跟踪性能,具有良好的工程应用价值。     

Preparation of magnetic fluid having active-gas resistance and ultra-low vapor pressure for magnetic fluid vacuum seals

The magnetic fluid, having an ultra-low vapor pressure property of 7·0×10⁻¹⁰ Pa at 293 K, was prepared. Hexafluoropropylene oxide polymer oil having high molecular weight was used as base oil. Magnetic particles were dispersed by using two types of new designed and synthesized hexafluoropropylene oxide acid derivative surfactants. The obtained magnetic fluid had a saturation magnetization of 35·0 mT, its magnetite particles were dispersed stably and showed a superior resistance to active gasses. It was ascertained that the magnetic fluid vacuum seal using the prepared fluid had the ultra high vacuum performance.