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product news/產品新聞


a reliable and permanent solution to the problem of porosity in cast metal parts. Typically, impregnation is carried out in three stages:


first, parts are placed in an autoclave and a vacuum applied that will draw air out of any porosity before a liquid sealant is introduced; second, parts are washed in a cold wash cycle; and finally they are moved to the “hot cure tank” where the heat transforms the liquid within the porosity into a solid, flexible plastic.


Te success of the R-FL-Duo depends upon clever


chemistry developed at Ultraseal’s headquarters in Coven- try, U.K. Te twin-module machine works with Ultraseal’s market-leading recycling sealant, Rexeal 100. “Typically after impregnation there is a dedicated wash module to ensure that components are clean before the last stage of impregnation,” said Kevin Siviter, technical man- ager, Ultraseal. “Tis is different. Tere is no wash station – parts go straight from the autoclave to the hot cure tank. Te R-FL-Duo has a new hot cure recycling process. Customers will get the same impregnation quality as they would achieve with a three-module machine in regard to sealability and cleanliness but the machine would take up one-third less space, less energy is required to run it and it has increased production throughput. Ultraseal is exhibiting at GIFA alongside Sterr & Eder


and Lubrolene—a series of water-free die release agents developed by the Aoki Science Institute of Japan and for which Ultraseal has been granted exclusive European distri- bution rights. 


一般情况下,浸渗通过三步完成:第一步,将铸 件置于高压釜中,真空设备将在液体密封剂进入之前 把孔隙中的空气抽空;第二步,铸件在冷水循环中清 洗;最后,铸件被移到热固化箱中,热量将把孔隙中 的液体变为固态的软塑料。


R-FL-Duo的成功依赖于在位于英国考文垂的 Ultraseal总部研发的聪明的化学物质。这样的双模 块设备与Ultraseal市场领先的循环密封材料Rexeal 100共同作用。


“一般情况下,在第一步浸渗之后,专门的清洗 模块确保铸件在最后一步浸渗之前是清洁的,”技 术经理Kevin Siviter说:“这是不同的。没有清洗 站——铸件直接从高压釜转移到热固化箱中。R-FL- Duo设备采用新的热固化循环工艺。如采用三步法设 备一样,客户将获得同样的浸渗效果,包括密封性和 清洁度,但是,新设备只需二步就能完成,需要较少 的能源并且提高了产量。”Ultraseal将在GIFA上展 出Sterr & Eder和Lubrolene等一系列由日本青木研 究所研发的无水模具脱模剂,Ultraseal公司的这些 产品获得了欧洲市场的独家经销权。 


Innovative Coating to Prevent White Film Defects 可以防止白膜缺陷的创新涂料


Foundries are increasingly faced with a rising demand


on the casting quality, dimensional consistency, and surface quality. For many years metalcasters have been struggling with the casting defect “white film,” which appears on the casting surfaces of thick-walled castings made of nodular graphite cast iron. Tis is a pockmark-like, rough area on the casting surface, which is covered with a white film. Te film is removed by sandblasting the castings; how-


ever the irregular surface remains and often leads to graphite degeneration. Te only corrective measures described in literature are as follows: • Lower the pouring temperature. • Increase the addition of new sand. • Examine the loss on ignition, electrical conductivity, ni- trogen content and if necessary the phosphorous content of the reclaimed material.


• Increase gas permeability. • Reduce the amount of curing agent for furan resin bonded molds.


• Minimize the oxygen-affine elements, examine the melt additives. Unfortunately the above measures are either insufficient


or cannot be fully implemented by the customer. For this reason, this casting defect leads to higher fettling costs


铸造厂面临着对于铸件质量、尺寸精度和表面质量 越来越高的要求。多年以来,铸造企业已经与铸件的 白膜缺陷展开了斗争。白膜出现在厚壁球墨铸铁件的 表面,是类似凹坑状的覆盖了白膜的不平区域。 白膜通过铸件的喷砂处理去除;然而,表面仍旧 不规则且经常导致石墨退化。唯一的纠正方法如下所 述: • 降低浇注温度 • 增加新砂的添加量 • 检查回收材料的烧失率、导电率、含氮量,根据需 要检查含磷量


• 提高透气性 • 减少呋喃树脂添加剂铸型所用固化剂的含量 • 将亲氧元素减到最小,检查熔炼添加剂 可惜的是,以上检测要么不充分,要么不能完全由 客户完成。因此,由于重复工作和多余的壁厚,这样 的铸件缺陷导致更高的清理成本,一些情况下,还会 导致较高的评估成本。


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


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