铸型封箱条的配方设计及成形工艺.pdf

学兔兔 铸型封箱条的配方设计及成形工艺 I、 伟，徐 珏，朱 筠 (上海市机械制造工艺研究所有限公司 铸造分所，上海 200072) 摘要：分析了基料、填充料和稀释剂的材料特性，利用纺织废绒代替矿物纤维填充料制备铸型 封箱条；探讨了坯料混合及封箱条成形设备的作用机制。试验结果表明，高分子聚合物基料的 相对分子质量对封箱条的耐候性和柔韧性有影响，应根据不同气温条件合理调整高低相对分子 质量聚合物的比例；填充料的形态对封箱条的内聚强度和尺寸稳定性有影响，当纺织废绒与粉 状填充料的质量比为1：25时，铸型封箱条的综合性能最佳。 关键词：封箱条；纺织废绒；高分子基料；挤出成形 中图分类号：TG221 文献标识码：A 文章编号：1 673-3320(201 1)04-0007-03 Composition Design and Forming Process of Sealing Strip for Cast Mold Bu Wei，Xu Jue，ZhuYun (Foundry Branch，Shanghai Machine Building Technology Institute Co．，Ltd Shanghai 200072，China) Abstract：The matefial behavior of base，filler and diluents were analyzed．Instead of mineral fibers，the waste cotton fibers were used to produce the sealing strip for cast mold．The mechanism of semifinished body mixer and strip former were discussed．The test results show that the weatherproof and flexibility of sealing strip are affected by the relative molecular weight of high polymer base material，the ratio between high relative molecular weight and low relative molecular weight is adjusted on different air temperatures；Due to the effects of different filler form s on the coherence strength and dimensional stabilitv．the performance of sealing striP would be best when the mass ratio between COtton fiber and powder filler iS 1：25． Key words：sealing strip；waste cotton fiber；high polym er base material；extrusion 铸型封箱条主要用来密封铸型装配结合面， 故障。本文通过对铸型封箱条相关材料及工艺的 防止浇注时跑火和产生过大飞边，也可用于圈围 试验分析，利用纺织行业废弃棉纤维代替传统纤 型芯出气眼、排气孔，防止金属液流进气眼堵 维状填充料，制得具有优良存放稳定性及使用性 塞出气道。封箱条必须有很好的可塑性，浇注过 能的铸型封箱条。 程中能够阻挡金属液流过[”。目前普遍使用的铸 型封箱条主要由无机填充料和基料组成。填充料 1 铸型封箱条的配方组成 包括