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采用膨胀式擦拭器技术,已能生产对裂纹敏感的2000和7000系列铝合金板锭。使用直接冷却铸造方法时,铸锭开裂经常使生产Al-Cu-Mg和Al-Zn-Mg合金的厂家感到困难,2024和7075合金就是典型的一例。通过严格的炉熔炼制度,铸造实践以及对成分进行严密控制,虽开裂程度有时能显著减小。然而,如果不使用可控的冷却水排除装置——铸锭擦拭器,则往往不能得到理想的铸锭尺寸及合金产品。擦拭器成功地用于大型方锭铸造机已有数年之久,这些橡胶制的平板擦拭器与使用橡胶
With expanded wiper technology, Crack-proof 2000 and 7000 series aluminum ingots have been produced. Cracking of the ingot often makes it difficult for manufacturers of Al-Cu-Mg and Al-Zn-Mg alloys to use the direct cooling casting method, with the 2024 and 7075 alloys being a typical example. Through strict furnace smelting system, casting practices and tight control of the composition, the degree of cracking can sometimes be significantly reduced. However, the ideal ingot size and alloy products often can not be obtained without the use of a controlled cooling water exclusion device, an ingot wiper. Wipers have been successfully used in large square ingot casting machines for several years and these rubber flatbed wipers have been used with rubber