锌合金制品压铸模具CAD/CAM系统软件的研究与开发

充分利用AutoCAD2000的开放特性,采用Autodesk公司提供的功能强大的开发软件包VBA,开发了锌合金制品压铸模具CAD系统,介绍了该软件的功能特点和结构.     

镁合金触变成形技术在壳罩产品上的应用

介绍镁合金的特点和镁合金在壳罩产品上的应用状况;对镁合金触变注射成形产品与镁合金压铸产品的特点进行比较,列举了一些镁合金触变注射成形零件及其特点。说明镁合金触变注射成形技术有很好的市场前景。     

基于C/S的铸件库存管理信息系统的研究与开发

介绍了库存管理系统的必要性及软件设计,针对铸造企业存在的问题提出解决方案,通过该方案实现了铸造企业信息共享,规范操作流程,统一铸件编码的目的.介绍了软件开发的需求分析、程序设计过程,阐述了软件系统开发的一些关键技术.     

Effects of deformation temperature and rate on compressive deformation behaviour of Y112 die cast aluminum alloy in semi-solid state

The semi-solid compression deformation behaviour of Yl12 die casting aluminum alloy with nondendritic structure obtained under the semi-solid isothermal treatment condition of 570 ℃ and 120 rain, was investigated by means of Gleeble-1500 thermal-mechanical simulator. The results show that, when the strain is lower than 0.8, along with the compression strain increasing, the compression stress firstly increases rapidly, then decreases gradually. Under the condition of different deformation temperatures and deformation rates, the maximium compression stress is obtained simultaneously when the strain is 0.07 approximately. Furthermore, when the deformation rate keeps a constant, the compression stress decreases along with the deformation temperature increasing, and when the deformation temperature keeps a constant, the compression stress increases along with the deformation rate increasing.     

铸造工艺CAD软件的研究及开发

利用AutoCAD2000的开放特性，采用功能强大的二次开发软件包ObjectARX2000,以VO＋＋6．0为开发工具，将铸造工艺参数制作成Access数据库，与AutoCAD2000的图形数据库结合，开发出铸造工艺二维CAD系统。     

基于Procast软件的熔模铸造计算机模拟

介绍了Procast软件在熔模铸造中的一些应用实例，应用表明铸造模拟软件Procast能够预测熔模精密铸件在充型凝固过程中可能产生的缺陷，从而辅助工艺人员进行工艺优化，指导实际熔模精密铸件生产。采用的模拟方法和步骤对其它铸造工艺的确定有借鉴作用。     

镁合金废料回收技术的现状及进展

镁合金废料回收对于镁合金的规模应用和镁工业的可持续发展具有非常重要的理论意义和实际价值.首先简单介绍了镁合金废料的分类及回收方式,然后重点回顾了镁合金废料的回收方法和质量控制措施,最后指出了目前还存在的问题,并对今后的发展方向进行了展望.     

Thermal-stress simulation of direct-chill casting of AZ31 magnesium alloy billets

Two-dimensional (2D) transient coupled finite element model was developed to compute the temperature and stress field in cast billets, so as to predict the defects of the I-type billets made from AZ31 magnesium alloy and find the causes and solutions for surface cracks and shrinkages during direct-chill (DC) casting process. Method of equivalent specific heat was used in the heat conduction equation. The boundary and initial conditions used for primary and secondary cooling were elucidated on the basis of the heat transfer during the solidification of the billet. The temperature and the thermal-stress fields were simulated with the thermal-structural coupled module of ANSYS software. The influences of casting parameters on the distributions of temperature and stress were studied, which helped optimize the parameters (at pouring temperature of 680 °C, casting speed of 2 mm/s, heat-transfer coefficient of the second cooling equals to 5 000 W/m²·°C⁻¹). The simulation results of thermal stress and strain fields reveal the formation mechanism of some casting defects, which is favourable for optimizing the casting parameters and obtain high quality billets. Some measures of controlling processes were taken to prevent the defects for direct-chill casting billets. Funded by the 973 National Grand Theoretical Research Program(No. 2007CB613700), the National Sci&Tech Support Program(No. 2007BAG06B04), National Natural Science Foundation of China (No. 50725413), and the Natural Science Foundation of Chongqing(No. CST, 2007bb4413)     

ProCAST软件在铸造凝固模拟中的应用

为研究铸造工艺对铸件质量的影响,利用计算机进行了铸件的凝固模拟.介绍了有限元软件Pro-CAST的组成模块、功能以及应用,在应用实例中利用ProCAST软件模拟预测了铸件砂铸工艺中产生的宏观缩孔缺陷.研究表明:铸件中存在模拟预测的宏观缩孔缺陷;对浇注系统和冒口设置参数进行了优化,优化后的工艺提高了铸件产量,降低了成本;模拟结果表明,铸造模拟软件ProCAST能够准确地预测铸件在充型凝固过程中可能产生的缺陷.     

可移动文物保护修复标准化研究初探——以故宫博物院可移动文物保护修复标准预研为例

文物作为历史的唯一见证者具有很强的历史性、人文性和不可再生性,对其进行保护修复是极为必要的。提高文物保护修复水平,不但可以充分发挥其文化价值,对促进经济发展和社会发展也具有重要意义。制定文物保护修复标准的目的在于指导并引领文物保护修复工作有序进行,推动文物保护修复工作向科学化发展。本文介绍了国内外可移动文物保护修复标准的制定情况,探讨了可移动文物保护修复标准化工作的目的与意义,并以故宫博物院文物保护修复标准化工作为例,试论如何通过标准化视角开展可移动文物保护修复工作。