共查询到20条相似文献,搜索用时 109 毫秒
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含树脂芯砂的粘土砂旧砂再生较一般粘土砂再生显得更为复杂和困难,通过实验研究了几种再生方法的可行性和再生效果。结果表明:气流再生、低温加热-气流再生,只能获得用于造型的再生砂;热法再生、高温煅烧-气流再生,能获得优质的再生砂;中温加热-气流再生,其效果受加热温度的影响很大。 相似文献
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分析了覆膜砂旧砂热法再生的影响因素。试验结果表明,采用热法再生砂制成的覆膜砂具有强度高、发气量低等优点,将其运用于实际生产可降低生产成本,具有良好的社会经济效益。 相似文献
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介绍了酯固化碱性酚醛自硬树脂在再生砂上应用存在的主要问题及原因,通过采用联合再生方式处理旧砂,降低再生砂灼烧减量和酸耗值,使用再生砂专用碱性酚醛自硬树脂,可以提高再生砂强度,减少铸件粘砂现象。 相似文献
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Gas evolution characteristics of three kinds of no-bake resin-bonded sands for foundry in production
Xue-wen Qian Peng Wan Ya-jun Yin Yu-yang Qi Xiao-yuan Ji Xu Shen Yuan-cai Li Jian-xin Zhou 《中国铸造》2022,19(2):140-148
No-bake resin-bonded sand is commonly used in casting production.However,its air pollution is relatively serious,especially in the molding and pouring process.For this reason,it is necessary to study the gas evolution characteristics of no-bake resin-bonded sand from room temperature to high temperatures,and not only the amount of gaseous products,but also the composition of the gaseous products.No-bake furan resin-bonded sand(#1),phenolic urethane no-bake resin-bonded sand(#2),and alkaline phenolic no-bake resin-bonded sand(#3)are the three most common no-bake resin-bonded sands in casting.The gas evolution volume and rate of these three no-bake resin-bonded sands were studied.Thermogravimetry-mass spectrometer(TG-MS),headspace-gas chromatography/mass spectrometer(HS-GC/MS),and pyrolysis-gas chromatography/mass spectrometer(PY-GC/MS)were used to measure the composition of the gaseous products emitted from binders at room temperature and high temperatures.The differences between formaldehyde,heterocyclic aromatic compounds(HAC),monocyclic aromatic hydrocarbons(MAH),and polycyclic aromatic hydrocarbons(PAHs)gaseous products from the three types of no-bake resin-bonded sands during the molding and casting process were compared.From the perspective of environmental protection,alkaline phenolic no-bake resin-bonded sand and no-bake furan resin-bonded sand are better than phenolic urethane no-bake resin-bonded sand. 相似文献
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意大利IMF树脂砂再生设备的结构、原理及特点 总被引:1,自引:0,他引:1
介绍意大利IMF公司的树脂砂再生设备,该设备采用塔式联合结构和震动软再生旧砂的方法,具有结构紧凑、全封闭、占地面积小、布线灵活等特点;再生能力强、再生砂品质好、没有粉尘污染;借鉴其经验,对国产树脂砂再生设备的开发、研制提出建议。 相似文献
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用呋喃树脂砂生产大型铸铁件的工艺分析与质量控制 总被引:2,自引:1,他引:1
依据对呋喃树脂砂生产大型铸铁件的特性分析,阐述了用呋喃树脂砂生产大型铸铁件的铸造工艺要点与关键工序的过程质量控制.通过介绍几种典型大型铸铁件用呋喃树脂砂生产的实例,具体说明了用呋喃树脂砂生产大型铸铁件质量的控制原则. 相似文献
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介绍了一种铸造型芯用烘干硬化水溶性树脂砂和影响其强度性能的因素.生产应用结果表明:该树脂砂可取代油砂、合脂砂用来制造复杂砂芯,并具有烘烤温度低、烘烤时间短、发气量小、成本低,投资小等特点. 相似文献
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The mechanical properties of resin-bonded sand mixtures at high temperatures significantly affect the quality of casting. However, the existing instruments for high-temperature performances testing mainly focus on inorganic binder-bonded sands no matter the test items or the atmospheric protection, while the instrumentss specially designed for resin-bonded sand are not yet available. A new instrument for testing the hightemperature performance of resin sand was designed including the confirmation of the testing parameters, loading, measurement and control systems, and the design of the frame shape and heating furnace. This instrument can test the compressive strength, heat tolerance time and restraining load of phenol-formaldehyde resin coated sand, self-hardened furan resin sand, and trimethylamine(TEA)-based resin bonded sand at high temperatures. The developed instrument has a high accuracy offering smaller than 0.3% deviation at a full scale in the measurement of the high temperature compressive strength and the restraining load over the range of 0-6.8 MPa and 0-2,000 N, respectively. The high temperature heat tolerance time range is 0-300 s and its measurement accuracy is ±1 s. 相似文献
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XZ-1型树脂砂是一种新型CO_2硬化树脂砂。它以水溶性“XZ-1”型树脂为粘结剂,Ca(OH)_2为固化刑,在CO_2气体作用下可快速硬化。且具有硬化强度高、型砂在混制、制芯、硬化、浇注过程中环境污染小,制芯工艺简单等优点。作者研究了树脂加入量,固化剂加入量、吹缷时间对树脂砂强度的影响,并讨论了其主要的铸造工艺性能。 相似文献
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