of autonomous optimization occurs over several calculation generations (Fig. 2). With this method, it is possible to work with multiple, potentially conflicting goals (e.g. improved casting quality, productivity and material usage). To achieve the desired objectives, process parameters such as pouring temperature, alloying elements and mold preheating, as well as geometries (gating design, ingates and riser dimensions), can be varied.
INTERNET PLATFORM DROPS COST Te numerical simulation of solidification processes has
become a valuable tool for evaluating and optimizing casting pattern and rigging design, dramatically reducing the cost of reaching a satisfactory design, which can be expensive and time-consuming when using a trial-and-error approach. A web-based computer-assisted engineering system for metalcasting, compared with a standalone system, would allow many metalcasting facilities to share limited resources, especially among medium- and small-scale facilities that may have difficulty setting up their own system. To implement such a system, a Java-based multi-tier
architecture and common object request broker architecture (CORBA) based distributed computing technology could be used. An application service provider (ASP) would provide online application and management service.
Working With the System
To start the web-based simulation process, the metalcaster makes a CAD file using a standard data format, then logs into a web server, uploads the file and fills out any necessary process parameters based on the manufacturing conditions. Extensible markup language (XML) is the universal format for structured documents and data on the web.
并。多次重复该过程直到工艺改进不再带来更多的提 高为止。
就像在生物世界一样，自动优化的演化过程经过几 代计算后就实现了（如图2）。采用这种方法，可能实 现多目标甚至有冲突目标的优化（例如，提高铸件质 量、生产效率和材料利用率）。要实现希望的目标，就 要改变工艺参数，如浇注温度、合金元素、铸型预热以 及几何形状（浇注系统、内浇道和冒口的尺寸）。
互联网平台可以降低成本
凝固模拟软件已经成为评价和优化铸造模样和浇注 系统的有效工具，大幅度降低了实现可行工艺的成本， 传统试错法成本高，耗时长。基于网络的计算机辅助铸 造工艺系统和单机系统相比，就可以使很多用户共享有 限的资源，特别是对那些建立自己独立分析系统有困难 的中小企业。
为了实现基于网络的分析系统，采用了基于Java的 多层架构和共同的目标请求管理架构（CORBA）的分 布式计算技术。应用服务供应商（ASP）能够提供在线 应用和管理服务。
应用该系统 要开启基于网络的模拟分析，铸造工作者做好标准
Fig. 3. This flow chart shows how small metalcasters would work with an internet-based simulation platform.
圖。 3。此流程圖顯示了如何將與小metalcasters以互聯網為基礎 的仿真平台。
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FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION Summer 2011
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