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| 研究生： |
李冠伻 Gumn-Ben Lee |
|---|---|
| 論文名稱： |
喃模造模參數對鑄模性質及鑄件品質的影響 The Influence of Furan's Molding Parameters to the Properties of Mold and the Quality of the Casting |
| 指導教授： |
張晉昌
Chang, Jin-Chung |
| 學位類別： |
碩士 Master |
| 系所名稱： |
工業教育學系 Department of Industrial Education |
| 論文出版年： | 2000 |
| 畢業學年度： | 88 |
| 語文別： | 中文 |
| 中文關鍵詞： | 喃自硬性造模法 、喃樹脂 、催化劑 、硬化時間 、再生砂 |
| 英文關鍵詞： | furan no-bake molding process, furan resin, catalyst, curing time, reclamation sand |
| 論文種類： | 學術論文 |
| 相關次數： | 點閱：183 下載：0 |
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中文摘要
各種新材料和新方法不斷的出現，使鑄造工業有很大的轉變，像喃樹脂造模法的興起，漸漸成為大型鑄件的造模
方式，其便捷、乾淨的造模方式已深為鑄造界所喜愛。
本研究係探討喃模砂的一些性質變化，如硬度、抗壓強度、抗剪強度、表面安定性、透氣性、粒度、燒灼減量等之影響，以探討新砂與再生砂在何種添加比例上，能達到鑄造過程最經濟，鑄件品質最好的要求。
再者，利用厚薄不同的階梯模板，澆鑄灰口鑄鐵與球墨鑄鐵，以分析鑄件的表面品質和厚薄處的顯微金相組織，並針對階梯件在厚薄處之不同冷卻效果，分析鑄件在厚薄處的硬度。
本研究喃模砂種類為100%新砂、50%新砂加50%再生砂、100%再生砂，黏結劑添加量為0.5%、1.0%、1.5%，硬化時間60分鐘，根據研究結果顯示：
使用1.5%黏結劑，100%新砂的模面硬度最大，值為70；
表面安定性值最小為6.54%，亦即砂模表面最安定。使用0.5%黏結劑，100%新砂的透氣性最佳，值為719。
但1.5%黏結劑，50%新砂加50%再生砂得到的抗壓強度會較大；值為1.28MPa。
100%再生砂因殘留有前次造模的硬化層，1.5%黏結劑時，其顆粒最粗大，粒度指數為15.73，燒灼減量也大，為1.3%。抗剪強度最大，值為0.224MPa。
鑄件表面之品質方面，以50%新砂加50%再生砂加1.5%喃樹脂並由薄處澆入，所澆鑄出來的鑄件表面較為光滑。
澆鑄高度採30公分以上的澆鑄方式，表面氣孔多。
喃模澆鑄階梯形灰口鑄件時，厚處的金相呈現Type C石墨且向各方向均勻分散，薄處則呈Type B石墨且呈樹枝狀分佈。
球墨鑄鐵薄階處的球化率與球化粒數都比厚階處多，且薄階處的顯微組織內含的波來鐵多於厚階。
階梯狀鑄件薄階的硬度大於厚階。灰口鑄鐵厚階處勃氏硬度平均HB105，薄階硬度平均HB108。球墨鑄鐵厚階硬度平均HB81，薄階硬度平均HB87。
灰口鑄件厚處，以上表面硬度較大，平均HB107。灰口鑄件薄處，以下表面硬度較大，平均HB109。球墨鑄件厚處，以下表面硬度較大，平均HB82。球墨鑄件薄處，以下表面硬度較大，平均HB88。
Abstract
The continuous discovery of new materials and methods has brought about a lot of change in the foundry industry. For instance, the emerging of the Furan No Bake process has gradually not only become the principal method for large-sized castings, but also been accepted extensively in the foundry industry with its characteristics of convenience and cleanliness.
In the purposes of finding out the best combination of new sand and reclamation sand, and then reaching the demand of the most economical making process and the best quality for casting, this experiment has attempted to discuss some property changes of Furan No Bake process, such as the influence of mold hardn-
Ess, dry compression, dry shear, surface stability, permeability
, grainfineness, LOI and so on.
Furthermore, by using the ladder molding, pouring gray cast iron and nodular graphite cast iron, the surface quality of casting and micrograph in ladders have been analyzed. Also, with different cooling temperatures being put on ladders, we
could acquire the needed information about hardness.
The conclusions of the experiment are as follows:
The kind of Furan sand uses 100% new sand, 50% new sand plus 50% reclamation sand, 50% reclamation sand. Furan resin uses 0.5%, 1.0%, 1.5% in FNB process, and the time to hardness is set to 60 mins.
Uses 1.5% Furan resin. The 100% new sand is the best for hardness, surface stability and permeability, when 1.5% Furan resin is used getting the larger hardness 70. when 1.5% Furan resin is used getting the smaller surface stability 6.54%, when 0.5% Furan resin is used getting the best permeability is 719.
When 1.5% Furan resin is used, getting large dry compr-
ession of 50% new sand plus 50% reclamation sand. The value is 1.28Mpa.
Because the 100% reclamation sand remains the fronter hardness surface, in 60% furan resin, the value of the grain finess is 15.73. The largest value of the L.O.I. is 1.3%, and of the shear is 0.224MPa.
The surface quality of casting is best with the combination of 50% new sand, 50% reclamation sand and 1.5% of the furn binder, along with being pouring from the thin ladders.
Pouring height uses above 30cm location with many gas holes on the surface.
The micrograph of gray cast iron turns out to type C graphite, and type B graphite in thick ladders and thin ones, respectively. The graphite diverges are evenly from the thick ladders and the thin ones’ micrograph are dendrite.
The nodularity rating and the nodule count of nodular graphite cast iron are represented in the thin ladders, whcih are higher than those are visible in the thick ones.The micrograph in the thin ladders contains much more Pearlite as well.
The hardness of the thin ladders casting is larger than thick ones.
The Brinell Hardness Number for thick ladders of gray cast iron is HB105 in average; whereas for thin ladders is HB108 in average. The hardness for thick of nodular graphite cast iron is HB81 in average; whereas for thin is HB87 in average.
The Brinell Hardness Number for gray cast iron at thicker side of ladders is larger, HB107.in average.The hardness for gray cast iron, the thinner side is larger on reversed side, HB109 in average.
The Brinell Hardness Number for nodular graphite cast iron, reversed side is larger, HB82 in average.The hardness for nodular graphite cast iron, reversed side is larger, HB88 in average.
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