product news/產品新聞
clean the tools frequently to minimize downtime and have the molds remain hot enough to reapply refrac- tory coating. The problem with steel shot, glass bead and sand- blasting is mold vent and urethane damage. Rounding of mold edges leads to flash on the parts, shortens the mold life, creates secondary waste and creates the po- tential for eye injuries from atmospheric contaminates. Manual cleaning with chemicals and brushes is labor intensive, potentially harmful to workers, causes long downtime and cleans inefficiently and ineffec- tively in some places. Progressive Casting learned about Cold Jet from a sister company. Cold Jet offers a dry ice blast cleaning process that is similar in concept to sand or soda blasting, where the media is accelerated through a pressurized airstream. The main difference is that rather than sand or soda, Cold Jet’s system uses recycled CO2 in the form of dry ice to clean surfaces. The CO2 pellets are accelerated at supersonic speeds through a specialized hose and nozzle. Once the pellets hit the mold surface, the combination of kinetic energy and thermal gradient effects of the dry ice breaks the bond between the surface and the residue. Upon impact with the tool surface, the CO2 sublimates, returning to its natural gas form, without leaving any secondary waste to clean up. Progress tested a Cold Jet dry ice cleaning system
by applying it to its most delicate screen vents at full blast. Even at maximum blast aggression, the parts were undamaged and the molds looked brand new. “The system was shown in front of the president of the
经常清理铸型，从而将停工时间降到最小，并且使铸型 保持足够温度以便再次涂覆耐火涂料。
喷射钢丸、玻璃珠和砂粒的问题是损坏铸型的排气孔 和平滑度。边角部磨圆将导致铸件上产生飞边，缩短铸 型的使用寿命，造成二次浪费，而且可能由于空气污染 而导致伤害眼睛。
使用化学剂和刷子的人工清理方法是很费工时的，对 工人还有潜在的伤害，会造成长的停工时间，还有一些 部位的清理效率低或无效。Progress铸造公司从兄弟公 司处了解到cold jet 干冰清洗系统。Cold Jet 干冰清洗 系统是喷干冰的清理工艺，在概念上与喷砂或喷苏打相 似，都是通过加压气流加速介质的流动。主要区别是： 与使用砂子或苏打不同，冷射系统采用循环使用的CO2 以干冰的形式来清理表面。CO2干冰颗粒通过专用的软 管和喷嘴，加速到超音速的速度。干冰颗粒碰到铸型表 面时， 热膨胀 热梯度的综合作用将破坏铸型表面和残留 物之间的连接。与模具表面碰撞后，CO2将升华，回到 自然状态下的气态，不留下任何需清除的二次残留物。 为了测试冷射干冰喷射清理系统，Progress铸造公司 特意以最大的喷射量将其应用于清理最精细的排气孔。 即使在最大的喷射力作用下，部件也没有损坏，铸型看 起来仍是崭新的。Progress铸造公司的工艺装备主管
Shown is a mold before (left) and after being cleaned with dry ice blasting technology.
图中是干冰喷射技术清理前的铸型（左）和清理后的铸型。 66 |
FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION March 2015
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