含热芯盒、覆膜砂芯砂粘土砂的完全再生砂改性及相关设备研究

发布时间：2018-05-12 01:27

本文选题：粘土砂 + 完全再生砂　；参考：《山东建筑大学》2017年硕士论文

【摘要】：铸造是机械零件制造最主要的成形方法之一,在机械装备制造领域得到了广泛的应用。粘土砂铸造是铸造生产最常用的工艺方法,在铸造生产中每年产生大量的粘土废砂,污染了自然环境,浪费了资源。本课题组的前期研究发现,经过“700℃高温脆化+机械再生+微粉分离”获得的含树脂砂芯砂粘土砂的完全再生砂,和同种新砂相比,粒度不发生明显变化,角形系数和含泥量低、耗酸值高。由含热芯盒树脂砂芯砂粘土砂的完全再生砂混制热芯盒树脂砂时,其铸造工艺性能低于由新砂混制热芯盒树脂砂的铸造工艺性能;由含覆膜砂芯砂粘土砂的完全再生砂混制覆膜砂时,其铸造工艺性能基本达到了由新砂混制覆膜砂的铸造工艺性能。为了进一步提高粘土完全再生砂的铸造工艺性能,本课题开展了含热芯盒树脂砂芯砂粘土砂的完全再生砂和含覆膜砂芯砂粘土砂的完全再生砂改性技术研究,探索通过改性进一步提高再生砂铸造工艺性能的新途径。以含热芯盒树脂砂芯砂粘土砂的完全再生砂为研究对象,研究发现以盐酸水溶液为改性剂对含热芯盒树脂砂芯砂粘土砂的完全再生砂进行改性,可以提高再生砂的铸造工艺性能,其适宜改性工艺为“化学改性+烘干+机械搓擦+风选”,适宜改性参数为改性剂浓度0.75mol/L,改性剂加入量占砂子质量分数的4%,均化时间为80 min,由化学改性砂混制热芯盒树脂砂的热态和常温抗拉强度高于同种新砂。对含热芯盒树脂砂芯砂粘土砂的完全再生砂进行机械改性同样可以提高其铸造工艺性能,随机械改性次数的增加,机械改性砂的耗酸值、含泥量逐渐降低,由机械改性砂混制热芯盒树脂砂的强度逐渐提高,当机械改性次数为两次时,由机械改性砂混制热芯盒树脂砂的热态和常温抗拉强度均优于同种新砂。以含覆膜砂芯砂粘土砂的完全再生砂为研究对象,研究发现其适宜的改性工艺为“化学改性+烘干+机械搓擦+风选”,适宜改性参数为改性剂浓度1 mol/L,改性剂加入量占砂子质量分数的3%,均化时间为100 min,由在适宜改性工艺及工艺参数下获得的化学改性砂混制覆膜砂的热态和常温抗拉强度低于由同种新砂和完全再生砂混制覆膜砂的热态及常温抗拉强度,表明以盐酸水溶液为改性剂对含覆膜砂芯砂粘土砂的完全再生砂进行改性,不能提高其铸造工艺性能。但对含覆膜砂芯砂粘土砂的完全再生砂进行机械改性可以提高含覆膜砂芯砂粘土砂的完全再生砂铸造工艺性能,随机械改性次数的增加,含覆膜砂芯砂粘土砂的完全再生砂耗酸值、含泥量逐渐降低,由机械改性砂混制覆膜砂的强度进一步提高。依据本课题研究所确立的粘土完全再生砂化学及机械改性的工艺路线,本着借用及开发相结合的原则,对完成粘土完全再生砂改性工艺所需设备进行了评估分析,发现改性混砂机为完成粘土完全再生砂改性所需开发的设备,确定了搅笼式连续改性混砂机设计方案,开发了转速为960 r/min,驱动功率为4 KW,生产率为5 t/h的粘土完全再生砂改性混砂机。
[Abstract]:Casting is one of the most important forming methods of mechanical parts manufacturing. It has been widely used in the field of mechanical equipment manufacturing. Clay sand casting is the most common process method for casting production. A large amount of clay waste sand is produced every year in the foundry production, which pollutes the natural environment and wastes the resources. The previous research of this project found that "7" The complete regenerated sand containing resin sand core sand clay sand obtained by high temperature embrittlement at 00 C, mechanical regeneration + micro powder separation, has no obvious change in grain size, low angle coefficient and mud content and high acid consumption compared with the same kind of new sand. The casting process property of the resin sand containing hot core box resin sand core sand clay sand mixed with hot core box resin sand It is lower than the casting process properties of the resin sand made from the new sand mixed hot core box. The casting process property of the sand covered sand core sand clay sand is basically achieved by the casting process properties of the film mulched sand mixed with the new sand. In order to further improve the casting process properties of the clay completely regenerated sand, the project has carried out the heat content. The complete regenerated sand of core box resin sand core sand clay sand and complete reclaimed sand containing sand core sand clay sand are studied, and a new way to further improve the casting process performance of reclaimed sand by modification is explored. The research object is that the complete regenerated sand with hot core box resin sand core sand clay sand is the research object, and the study found that the hydrochloric acid solution is the modified solution. The modification of completely regenerated sand containing hot core box resin sand core sand clay sand can improve the casting process performance of regenerated sand. The suitable modification process is "chemical modification + drying + mechanical rubbing + wind selection", the suitable modification parameters are modifier concentration 0.75mol/L, the addition amount of modifier is 4% of sand mass fraction, and the homogenization time is 80 m In, the thermal and atmospheric tensile strength of the resin sand mixed with chemically modified sand is higher than that of the same kind of new sand. Mechanical modification of complete regenerated sand with hot core box resin sand core sand clay sand can also improve its casting process performance. With the increase of mechanical modification times, the acid value of mechanical modified sand and mud content gradually decrease, and the mechanical properties of the mechanical modified sand are gradually reduced. The strength of the modified sand mixed hot core box resin sand is gradually improved. When the mechanical modification number is two times, the thermal and atmospheric tensile strength of the resin sand mixed by mechanical modified sand mixed with hot core box is better than that of the same kind of new sand. The study shows that the suitable modification process is "chemical modification". "Sex + drying + mechanical rubbing + wind selection", the suitable modification parameters are 1 mol/L of the modifier concentration, 3% of the sand mass fraction of the modifier, and the homogenization time is 100 min. The thermal and atmospheric tensile strength of the coated sand mixed with chemically modified sand under the suitable modification process and process parameters is lower than that of the same new sand and the complete regenerated sand. The thermal and tensile strength at normal temperature of the coated sand shows that the modification of the complete regenerated sand containing the coated sand core sand clay sand with hydrochloric acid solution can not improve the casting process performance, but the mechanical modification of the complete regenerated sand containing the coated sand core sand clay sand can improve the complete regeneration of the sand clay sand with the covered sand core sand core. The performance of sand casting process, with the increase of the number of mechanical modification, the acid value of completely regenerated sand with sand core sand clay sand covered with film mulching sand, the mud content gradually decreased, and the strength of the coated sand made by mechanical modified sand was further improved. The equipment needed to complete the modification of clay completely regenerated sand is evaluated and analyzed. It is found that the modified mixer is the equipment needed to complete the modification of clay completely regenerated sand, and the design scheme of the continuous modified mixer is determined, the speed is 960 r/min, the driving power is 4 KW, and the productivity is 5 t/h. Clay completely regenerated sand modified sand mixer.

【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG231.5

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