Fig. 2. The schematic shows the flow of sand through the new system.


新系统砂流ॐ ֣ 。֣意


silica system offered the best payback. Although chromite costs about double the high cost of silica, the ability to magnetically separate chromite from silica and the high reclamation rate associated with furan binder made this system the low-cost choice. In addition to the cost benefits associated with the


switch, voestalpine Nortrak also could reduce its landfill contribution by increasing reclamation, which would prove environmentally responsible. Figure 1 contains a schematic showing the sand flow diagram for this system. Even though two sister casting facilities in Europe were


successfully running this system, voestalpine Nortrak still had two concerns: • Would the furan bonded chromite make rangy, manga- nese steel trackwork castings more crack prone?


• Would the silica separate from the chromite to avoid manganese silicate formation that produces unaccept- able surface quality? Initial trials with furan bonded chromite revealed some unexpected cure time issues. Tese issues were resolved and reduced concerns about cracking associated with the furan binder system. voestalpine Nortrak also made several trackwork casting molds with segments faced with 200-lb.


选。


硅砂，机械法Ӈ 砂矿铁铬，ׂ脂树醛酚化֡酯 ș 生，्选չ铬铁矿砂热法Ӈ生。 。求需资投չ本成理ה、成构ङ统系՟Оॐ۱ ੮


最报֛ङ统系砂硅 љ呋喃树脂Оডৈ剂ङ铬铁矿砂 较比是Ѹ，ҕДङ砂硅是本成ङ砂矿铁铬管ـ。ױ 生Ӈङ高较ङҼब剂ৈড脂树喃呋Њչ力ਈ选्ङױ 率，҅这З系统ङ成本最Ѻ。 ҸQGXZXU4联钢奥，יљञ效本成ङ统系换更д除


Э这，埋填物废صӗ收֛ङ生Ӈ砂高提过通љՕЭ՛ 。֣३流ङ统系砂是ॐ۱ ֣。明ચङુિ境环ث是 奥，统系થд੧运功成经已Դ造铸؟ ङ洲欧管ـ


钢联4UXZXGQҸ՛ё然有 З担忧： 是，ў铸૨铁钢锰ङ长瘦й用砂矿铁铬脂树喃呋ر ș ի更容易ӟ现裂ড়;


ș 硅砂是իਈђ铬铁矿砂И完Ҷӣख़，ђ৲避Ҳ铸ў


Fig. 3. The


continuous mixer fills a drag mold in the flaskless molding line.


连续式混砂机 ֣ 填Їি型造ঔ无֨ ҭ铸型。


June 2016 FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION | 49


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