• Title/Summary/Keyword: Lost Foam Casting

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A study on machining conditions on surface roughness in EPS End-milling (EPS 엔드밀 가공 시 표면 거칠기에 미치는 가공조건에 관한 연구)

  • Seo, Keum-Hee;Son, Min-Kyu;Yoon, Gil-Sang;Ko, Young-Bae
    • Design & Manufacturing
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    • v.11 no.2
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    • pp.46-50
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    • 2017
  • EPS used in lost foam casting elastic modulus is extremely low. So it is necessary to derive machining conditions for effective cutting. Therefore this study were analyzed end-milling machining conditions to affecting the surface roughness of EPS foam. The machining conditions were set to depth, feed, and RPM at 3-level. And 18experimental conditions were derived using mixed orthogonal array. The most important condition for surface roughness is RPM. In addition, RPM machining condition range test that can realize surface roughness less than $10{\mu}m$ was performed. he range of RPM conditions is more than 15,000. However the range of RPM conditions is a condition that is difficult to use in actual field. In the future variance analysis and experiments are needed to derive the range of machining conditions available.

Synthesis of Poly(alkylene carbonate) from Carbon Dioxide (이산화탄소로부터 Poly(alkylene carbonate)의 합성)

  • Lee, Yoon-Bae;Choi, Jeong-Hyun
    • Applied Chemistry for Engineering
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    • v.7 no.5
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    • pp.813-822
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    • 1996
  • In order to reduce carbon dioxide, one of the major greenhouse gases, a new type of copolymer, poly(alkylene carbonate) has been synthesized. The alternating copolymers have been obtained from carbon dioxide and various epoxides with zinc carboxylate as a catalyst. The number-average molecular weight of the polymer is about 50,000 and polydispersity is rather broad(5~10). The polymers are amorphous, and glass-clear materials that exhibit unusually facile and clean thermal decomposition behavior. Complete decomposition with no carbon residue is observed at elevated temperature even in an inert atmosphere. Terpolymers with bulkier epoxides improve the physical properties of the copolymer with simple epoxides. The decomposition properties of the polymer provide versatile applications such as ceramic, metal, and electronic binders and lost-foam casting. Further application of the polymer for the barrier film or the plasticizer will be investigated.

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