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fosters early, effective and ongoing communication. “Christie aims to incorporate metalcasting facili-


ties early in the design process. There’s a high level of collaboration,” said Jim Steward, Christie’s commodity manager. “Identifying and eliminating problems early in the process can help streamline progress and control costs by limiting design iterations.” Te second challenge is inherent in the supplier-customer


relationship, with the two engineering teams having to marry different considerations in a part’s final design. “Typically, the product designer is focused on issues such as


the part functionality, operating environments, failure modes, secondary operations and cosmetics,” said Mark Ratcliffe, manufacturing engineer. “Te engineers who will design the casting and its tooling, on the other hand, will be concerned with material flow, gating and coring issues, part shape vari- ability, hot and cold spots, shrinkage, parting lines, solidifica- tion patterns and porosity.” Recently, Christie experienced some problems with


a cast magnesium light engine enclosure in one of its digital projectors that had been produced in Asia. Due to significant challenges, Christie began to reexamine the casting’s sourcing strategy. “Tere were a few simple goals with the project: to identify and reduce design constraints as well as cost drivers where practical, while ensuring such changes would not


实用的铸件时,必须克服2个传统障碍。第一个挑战是 构建与铸件供应商的合作关系,鼓励和促进提前的、有 效和持续的沟通关系。


“Christie的目的是,在设计过程的早期就与铸造企 业结合,这是一种高水平的合作关系,”Christie的商 品经理吉姆•斯图尔德说,“在设计过程的早期识别并 解决问题,可以通过减少反复设计,从而有助于优化进 度并控制成本。”


第二个挑战是固有的供应商与客户的关系,双方的工 程师团队必须在零件最终的设计中进行综合考虑。 “通常情况下,产品设计工程师会重点考虑部件的功 能,运行环境,故障模式,二次加工和表面修饰,”制 造工程师马克•拉特克利夫说,“而另一方面,负责铸 件和模具设计的工程师,将关注材料的物流,浇注系统 和芯子的设计,铸件的变形、热节点和冷节点、收缩、 分型线、凝固模式和缩孔的形成。”


最近,Christie公司在亚洲生产的一款数字投影装置 镁光灯发光罩铸件出现了一些问题。因其显著的挑战 性,Christie开始重新审视铸件采购策略。


Casting made easy with voxeljet molds and patterns Sandcasting


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Investment Casting


3D printed patterns results in very low ash, zero pattern expansion and offering perfect burn-out characteristics


voxeljet AG Paul-Lenz-Straße 1a 86316 Friedberg Germany info@voxeljet.com www.voxeljet.com


June 2015 FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION | 55


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