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product news/產品新聞


Defect predictions and experimental findings in prototypes match


缺陷预测和原型中试验结果对应


benchmark in the automotive industry by creating a new methodology to introduce process changes and weight reduction without affecting functional requirements. 


了产量。该产品已成为汽车行业的标杆,由于创新了工 艺方法,在不影响功能要求的同时,减轻了重量。 


Improved Sand Reclamation for Foundries 改进铸造厂的旧砂再生技术


Today’s modern nobake casting facilities face increas-


ing pressure to reduce costs and impact on the environment while also improving casting quality. One of the ways of meeting these requirements is to invest in sand reclamation. While most metalcasting facilities have mechanical reclama- tion, many are looking to reduce further costs and invest in thermal reclamation or secondary attrition. Te ultimate in sand reclamation is thermal, where 100%


of all binder and other organic material are removed. First, the sand from the mechanical reclamation plant


passes through a cleaning tower, which basi-cally removes any metallic particles prior to entry into the furnace. Te fur- nace itself is a fluidized bed design with a gas and air mixture providing the fluidizing medium and igniting on the sand bed surface via pilot gas nozzles. Proof of flame sensors en- sure the gas supply is stopped if there is a pilot flame failure. Typically, a thermal unit will run on natural gas or LPG and


operate between 650C and 760C, de-pending on binder type. Omega offers a range of sizes, from 250kg/hour up to 12 tons/ hour with a three-year warranty on the burners and lining. Te patented “Dead Bed” system from Omega ensures total heat insulation and therefore lower running costs and longer life for the ceramic fiber insulation. Tis is due to the “Dead Bed” providing protection for the insulation from sand erosion caused by the moving processed sand. Low running costs are achieved through a combination of


the furnace insulation with the “Dead Bed” system, as well as a heat recovery module that removes the heat from the hot sand as it leaves the furnace and reintroduces that heat as warm air into the fluid bed section of the furnace. Tis means that the fluidizing air is always warm, lowering gas consumption. Safety is also of prime concern, so multiple safety systems


are employed to monitor fluid bed igni-tion, temperatures for every component (including dust collector), and the level of


当前,现代的自硬砂铸造企业,在提高和保证铸件 质量的同时,降低成本、减少对环境影响的压力越来越 大。投资于旧砂再生技术是满足这些要求的一个途径。 虽然大部分的铸造企业目前已采用了机械再生方式,但 是,还有很多企业希望进一步降低成本,并投资于热再 生或二次研磨再生。


旧砂再生的终极方式是热再生,在此过程中,脱除了 100%的粘结剂和其他有机物被去除。


首先,使机械再生设备处理过的旧砂通过清洗塔,在 进入焙烧炉基本上脱除。焙烧炉本身就是有可燃气体和 空气混合物的流化床,提供流态化介质,由可控的燃烧 嘴在砂床表面点火。通过检查火焰传感器,确保在点火 失败时停止供气。


一般来说,根据不同的粘结剂类型,加热装置可 使用天然气或液化气,运行温度在650C-760C之 间。Omega公司可提供一系列不同尺寸、产能为 250kg/h到12 t/h,有3年质保期的燃烧器和隔离衬。 Omega公司专利的“Dead Bed”系统确保完全隔 热,从而,降低了运行成本并延长了陶瓷纤维隔热材料 的使用寿命。这是因为“Dead Bed”系统为隔热材料 提供了保护,以免其被运动的砂粒造成磨损。 采用“Dead Bed”系统,炉子的隔热效果极好,再 加以炉后的热回收组件在热砂离开炉子前将其热量导 出,并以热空气的方式将这些热量再送入炉子的流化床 部分。由于这两种作用的综合,实现了低运行成本。这 意味着流态化气体总是保持温暖,使燃气的消耗降低。 安全性也是主要关切,企业采用了多重的安全系统来 监控流化床的点火、每个部件(包括除尘器)的温度以


72 | FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION March 2015


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