ZX7系列晶闸管逆变弧焊电源故障现象及解决方案

晶闸管逆变弧焊电源具有单管导通电流大、耐压高、正向压降低、过载能力强等特点,但在使用过程中会出现各种故障。结合研发ZX7系列晶闸管逆变弧焊电源的经验,在对应用厂家的ZX7系列晶闸管逆变弧焊电源时所排除的各类故障的分析,给出孤焊电源经常出现的故障现象和排除方案,为使用和维护ZX7系列晶闸管逆变弧焊电源提供了实用性的参考。     

在线测量系统中测量宏程序的开发

加工中心在线测量系统就是在现有加工中心基础上配以测头和计算机,使加工中心具有测量功能,测量宏程序是该系统的重要组成部分,重点介绍了测量宏程序的语法规则、编制方法和技巧,并举例说明.     

中国海关:加大打击力度遏止废物走私

2006年,全国海关缉私部门共立案查处走私废物案件49起,查获各类固体废物8 002.3吨,其中工业废物7 480.9吨、生活垃圾521.4吨,对178名犯罪嫌疑人采取了强制措施.在鼓励再生资源进口,打击废物非法入境,保护生态环境,维护正常经济秩序等各项工作中发挥了积极作用.……     

Custom 450不锈钢平衡析出相的热力学计算

Custom 450是一种应用广泛的马氏体时效不锈钢,在工业生产中,冶炼方法和合金元素的批次差异会对其性能产生明显影响。通过Thermo-Calc热力学软件研究了不同温度下该钢的平衡相组成类型和含量,并结合室温力学性能测试,分析C、N、Nb含量的影响。结果表明：Custom 450试验钢的平衡相有α、γ、σ、NbNi3、FCC-Cu、M23C6、Nb（C,N）和少量的Z-CrNbN、Laves相和χ相;随时效温度升高,材料抗拉强度和屈服强度降低,伴随着析出相类型转变和总质量分数的减少;C、N含量提高,使合金中平衡析出的碳化物及碳氮化物质量分数增加,金属间化合物平衡量减少;Nb含量的提高对总的碳化物及碳氮化物质量分数影响较小,而会促进金属间化合物质量分数的提高。     

基于ObjectARX自定义实体的冒口系统参数化设计

在AutoCAD 2010平台上,基于ObjectARX 2010的ObjectDBX自定义实体技术,用VS2008开发出实用的铸造冒口系统,提出了一种应用自定义实体实现参数化设计的新方法。用户既可以通过AutoCAD风格的MFC界面,由数据驱动图形修改参数,也可以通过夹点直接操作图形,实现冒口参数化设计。生成的冒口还具有爆炸、几何变换、对象捕捉等功能。     

Defining Specifications for Custom Products: A Multi-Attribute Negotiation Approach

Defining product specifications so that customers' needs could be well matched with suppliers' capabilities is a very challenging task in custom product design. This research links technical requirements on product design with product management issues and formulates specification definition as multi-attribute negotiation. Specification negotiation is modeled as an iterative process of give and take in search of a mutually acceptable configuration. A negotiation support system is developed based on a product configuration system to identify among the multiple attributes what to give, what to take, and by how much so as to facilitate specification negotiation operationally.     

基于快速成型技术的下颌骨缺陷患者植入体设计

阐述了利用快速成型技术和医学CT扫描技术的病患者下颌骨缺陷植入体设计方法,探讨了CT图像数据处理的常用方法,并提出了一种改善的方法。该方法基于CT图像数据构建出患者下颚骨的快速成型数据,对CT数据进行处理后,可以生成下颌骨缺陷的三维模型。根据下颌骨缺陷的三维模型,使用MIMICS软件和快速成型(RP)技术制作一个特制的下颌骨缺陷托盘植入体,提出的方法可以提高重建速度和几何相似。     

Linear Friction Welding Process Model for Carpenter Custom 465 Precipitation-Hardened Martensitic Stainless Steel

An Arbitrary Lagrangian-Eulerian finite-element analysis is combined with thermo-mechanical material constitutive models for Carpenter Custom 465 precipitation-hardened martensitic stainless steel to develop a linear friction welding (LFW) process model for this material. The main effort was directed toward developing reliable material constitutive models for Carpenter Custom 465 and toward improving functional relations and parameterization of the workpiece/workpiece contact-interaction models. The LFW process model is then used to predict thermo-mechanical response of Carpenter Custom 465 during LFW. Specifically, temporal evolutions and spatial distribution of temperature within, and expulsion of the workpiece material from, the weld region are examined as a function of the basic LFW process parameters, i.e., (a) contact-pressure history, (b) reciprocation frequency, and (c) reciprocation amplitude. Examination of the results obtained clearly revealed the presence of three zones within the weld, i.e., (a) Contact-interface region, (b) Thermo-mechanically affected zone, and (c) heat-affected zone. While there are no publicly available reports related to Carpenter Custom 465 LFW behavior, to allow an experiment/computation comparison, these findings are consistent with the results of our ongoing companion experimental investigation.     

Custom465马氏体时效不锈钢的强韧化特征及工艺优化

研究了Custom465马氏体时效不锈钢的时效温度、室温力学性能与微观组织的相关性，研究结果表明：Custom465钢时效析出相为N13Ti，其弥散分布使钢得到有效的强化；510℃时效后不仅强度较高，而且逆转变奥氏体形成对钢有较大的韧化作用，因此510℃时效后塑性和冲击韧性也较高，可作为Custom465钢的优化时效工艺。