降低石膏铸型内残留碳的探讨.pdfVIP

学兔兔 oct．2009 铸 造 VoI．58 NO．1O FOUNDRY 降低石膏铸型内残留碳的探讨 袁军平 ，陈绍兴 ，盛志华 ，黄金祥 (I．广州番禺职业技术学院首饰材料工艺研究所，广东广州511483；2．广州亿钻珠宝有限公司，广东广州511483) 摘要：试验了蒸汽脱蜡工艺、铸型培烧工艺对铸型除蜡和残留碳的影响，结果表明，采用蒸汽脱蜡有利于减少石膏型 焙烧时的残留碳问题，蒸汽脱蜡时间为90 min时，除蜡效果较好，且对铸型内壁没有破坏；铸型最高焙烧温度和保温 时间在很大程度上决定了培烧是否彻底，采用金镶焙烧制度比蜡镶制度有更好的焙烧效果，在焙烧高温阶段向炉膛内 通入空气，有助清除铸型内壁的残留碳。 关键词：首饰；石膏铸型；残留碳 中图分类号：TG249．5 文献标识码：A 文章编号：1001～4977(2009)10—1057—03 Discussion on Reduction of Residual Carbon I nside Gypsum Mould YUAN Jun—ping’，CHEN Shao—xing’，SHENG Zhi-hua。，HUANG Jin—xiang。 (1．Jewelry MaterialTechnology Research Institute of Guangzhou Panyu Polytechnic． Guangzhou 51 1483，Guangdong，China；2．Guangzhou Noble Jewelry Co．，Ltd．， Guangzhou 51 1483，Guangdong，China) Abstract： The impact of steam dewaxing and mould baking process on residuaI carbon was analyzed．The results show that steam dewaxing was beneficiaI to reduction of the residuaI carbon inside the mould during the baking process；when dewaxing time Iasted for 90 min．the dewaxing effect was the optimal and there was no damage to the inner wall of the mould．The peak baking temperature and holding time to a large extent determined whether or not the mould iS baked thoroughly．The metal setting baking system has better effect than that of the wax setting system because the former had a high baking temperature．Meanwhile．it was shown that introducing dry fresh air into the headh in high-temperature stage of baking cycle would help to remove residuaI carbon on mould wal1． Key ． words：jewelry；gypsum mould；residual carbon 金银首饰主要采用石膏型熔模铸造工艺生产，它 出现残留碳时，石膏的分解温度会进一步降低『21。如果 是一个多工序的复杂工艺过程，每个环节都有许多因 在焙烧过程中发生石膏的分解，铸件表面易出现砂眼、 素对铸件质量产生