本文選題：粘土砂 + 完全再生砂　； 參考：《山東建筑大學》2017年碩士論文

【摘要】：鑄造是機械零件制造最主要的成形方法之一,在機械裝備制造領(lǐng)域得到了廣泛的應用。粘土砂鑄造是鑄造生產(chǎn)最常用的工藝方法,在鑄造生產(chǎn)中每年產(chǎn)生大量的粘土廢砂,污染了自然環(huán)境,浪費了資源。本課題組的前期研究發(fā)現(xiàn),經(jīng)過“700℃高溫脆化+機械再生+微粉分離”獲得的含樹脂砂芯砂粘土砂的完全再生砂,和同種新砂相比,粒度不發(fā)生明顯變化,角形系數(shù)和含泥量低、耗酸值高。由含熱芯盒樹脂砂芯砂粘土砂的完全再生砂混制熱芯盒樹脂砂時,其鑄造工藝性能低于由新砂混制熱芯盒樹脂砂的鑄造工藝性能;由含覆膜砂芯砂粘土砂的完全再生砂混制覆膜砂時,其鑄造工藝性能基本達到了由新砂混制覆膜砂的鑄造工藝性能。為了進一步提高粘土完全再生砂的鑄造工藝性能,本課題開展了含熱芯盒樹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術(shù)研究,探索通過改性進一步提高再生砂鑄造工藝性能的新途徑。以含熱芯盒樹脂砂芯砂粘土砂的完全再生砂為研究對象,研究發(fā)現(xiàn)以鹽酸水溶液為改性劑對含熱芯盒樹脂砂芯砂粘土砂的完全再生砂進行改性,可以提高再生砂的鑄造工藝性能,其適宜改性工藝為“化學改性+烘干+機械搓擦+風選”,適宜改性參數(shù)為改性劑濃度0.75mol/L,改性劑加入量占砂子質(zhì)量分數(shù)的4%,均化時間為80 min,由化學改性砂混制熱芯盒樹脂砂的熱態(tài)和常溫抗拉強度高于同種新砂。對含熱芯盒樹脂砂芯砂粘土砂的完全再生砂進行機械改性同樣可以提高其鑄造工藝性能,隨機械改性次數(shù)的增加,機械改性砂的耗酸值、含泥量逐漸降低,由機械改性砂混制熱芯盒樹脂砂的強度逐漸提高,當機械改性次數(shù)為兩次時,由機械改性砂混制熱芯盒樹脂砂的熱態(tài)和常溫抗拉強度均優(yōu)于同種新砂。以含覆膜砂芯砂粘土砂的完全再生砂為研究對象,研究發(fā)現(xiàn)其適宜的改性工藝為“化學改性+烘干+機械搓擦+風選”,適宜改性參數(shù)為改性劑濃度1 mol/L,改性劑加入量占砂子質(zhì)量分數(shù)的3%,均化時間為100 min,由在適宜改性工藝及工藝參數(shù)下獲得的化學改性砂混制覆膜砂的熱態(tài)和常溫抗拉強度低于由同種新砂和完全再生砂混制覆膜砂的熱態(tài)及常溫抗拉強度,表明以鹽酸水溶液為改性劑對含覆膜砂芯砂粘土砂的完全再生砂進行改性,不能提高其鑄造工藝性能。但對含覆膜砂芯砂粘土砂的完全再生砂進行機械改性可以提高含覆膜砂芯砂粘土砂的完全再生砂鑄造工藝性能,隨機械改性次數(shù)的增加,含覆膜砂芯砂粘土砂的完全再生砂耗酸值、含泥量逐漸降低,由機械改性砂混制覆膜砂的強度進一步提高。依據(jù)本課題研究所確立的粘土完全再生砂化學及機械改性的工藝路線,本著借用及開發(fā)相結(jié)合的原則,對完成粘土完全再生砂改性工藝所需設(shè)備進行了評估分析,發(fā)現(xiàn)改性混砂機為完成粘土完全再生砂改性所需開發(fā)的設(shè)備,確定了攪籠式連續(xù)改性混砂機設(shè)計方案,開發(fā)了轉(zhuǎn)速為960 r/min,驅(qū)動功率為4 KW,生產(chǎn)率為5 t/h的粘土完全再生砂改性混砂機。
[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.

【學位授予單位】：山東建筑大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG231.5

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