product news/產品新聞
Metalcaster Cuts Cleaning Costs, Improves Worker Environment A major issue in the metalcasting industry is the down-
降低清理成本，改善作业环境
time caused when cleaning permanent aluminum molds, core boxes, semi-solid castings and die-casting machines. Typical manual cleaning methods require cool down, disassembly, unproductive hours of messy hand cleaning or abrasive media blasting and then time-consuming reas- sembly and reheating. In addition, most traditional cleaning methods are not fully effective and often result in damage to the tooling, part and/or equipment. Cold Jet dry ice cleaning improves cleaning times using
an environmentally responsible, non-destructive cleaning method. Dry ice cleaning eliminates equipment damage, reduces scrap product when compared to alternative clean- ing methods and allows for complete online cleaning—even while hot—so production time can be maximized and touch-up cleanings are safe and easy. A metalcaster in Plymouth, Minn., U.S., successfully used Cold Jet dry ice cleaning to clean core boxes and permanent aluminum molds, resulting in a faster and quieter solution that extended the asset life of their tool- ing and equipment. Te foundry specializes in precision die castings and sand
castings for the automotive, aerospace and defense indus- tries. Refractory coatings, resin spray buildup, sand casting components and core residues on the core boxes were previ- ously being cleaned by sand blasting and manual brushes. Both cleaning processes were slow, ineffective, caused damage to tooling and machines and put workers’ safety at risk. Sand blasting destroyed the urethane and damaged the dimensions on the molds and routinely destroyed the vents and screens on the core boxes. Te company was looking for a cleaning method that
would easily remove the entire refractory coating and other residual material so they could achieve a consistent mold surface for the finished product—all without damaging the dimensions of the mold or destroying the vents and screens on the core boxes. It instituted a Cold Jet dry ice cleaning program that resulted in more cleaning with less disassembly. In addition, the facility significantly improved the utilization rates and life of its tooling and equipment, while creating a safer, more environmentally responsible workplace. The dry ice blast cleaning process is similar in con- cept to sand or soda blasting, where the respective media are accelerated through a pressurized airstream. The main difference is that Cold Jet’s system uses recycled carbon dioxide in the form of dry ice Micro Particles to clean and prepare surfaces. The dry, non-conductive Micro Particles are accelerated at supersonic speeds through a specialized hose and nozzle. Once the Mi- cro Particles strike the surface, the effect of the kinetic energy transfer, thermal shock and gas expansion breaks the bond between the substrate and the contaminant and flushes the contaminant away. Also, upon impact with
半固体铸造和压铸机的一个主要问题是因清理铝 金属型，芯盒产生的停机。典型的手工清洗方式需 要设备降温，拆装，数小时徒劳杂乱的手工清理或 用喷丸清理，然后再重新组装和再加热。此外，大 多数传统的清理方法并不完全有效，经常引起模具 或设备的损坏。 Cold Jet公司的干冰清理方法，无需拆装，节省了清 理时间并且环保。与其他清洁方法相比，干冰清理方法 避免了因拆装引起的设备损坏，降低了废品率，并且是 真正的在线清理，即使在设备还是热态时也能进行，使 生产时间最大化，使清理工作变得安全、简单。 美国明尼苏达州普利茅斯的一家铸造厂，成功地 使用Cold Jet公司的干冰清理方法清理芯盒和铝金属 型，为提高模具和设备的使用寿命找到了更快，更安 静的解决方案。
这家铸造厂主要为汽车，航空航天和国防工业供 应精密压铸和砂铸件。之前，芯盒中的耐火涂料，树 脂喷涂的堆积等残留物通过喷砂清理或用刷子手工清 理。这两种清理方式耗时且效果不佳，容易造成模具 和设备的损坏，而且给工人造成安全风险。喷砂清理 破坏了聚氨酯层，损害了模具精度，通常也磨损芯盒 的通风孔和隔板。
该公司一直在寻找一种清理方法，能够很容易地 去除所有耐火涂料或其他材料的残留，使模具表面始 终保持清洁，保证产品的高质量，也不损害模具的尺 寸精度或芯盒的通风孔和隔板。公司选择Cold Jet干 冰清理方法，因此，可进行更多的在线清理而无需拆 装。另外，通过该方法，公司模具和设备的利用率和 使用寿命显著提高；同时，还创造了更安全、更环保 的工作环境。
喷射干冰清理的方法在概念上与喷砂或喷苏打 类似，即通过加压的气流加速装置把不同的介质喷 出。主要的区别是，Cold Jet干冰清理方法使用回收 的二氧化碳以干冰微粒形式喷出，清洁设备表面。 干燥的，非导电的二氧化碳微粒通过特殊的软管和 喷嘴加速以超音速喷出。一旦微粒撞击表面，动能 转化产生复合的效果，冲击产生的热能和气体膨胀 破坏了底面与污染物之间的结合并把污染物带走。 此外，当与设备表面碰撞，干冰微粒升华，不留二 次废弃物或残余物。
June 2014
FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION | 75
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