11 Topic: 주조의 분류 - 소모성주형(expendable mold) 응고냉각후 주형을 파괴하여 주물을 꺼냄주형재료에 따른 분류사형주조(sand casting)셸주조(shell molding)석고주형주조(plaster-mold)세라믹주형주조(ceramic-mold)모형재료에 따른 분류소실모형주조(lost-foam)인베스트먼트주조(investment, or lost-wax)
26 Topic: 인베스트먼트주조(로스트왁스법) FIGURE Schematic illustration of investment casting (lost wax process). Castings by this method can be made with very fine detail and from a variety of metals. Source: Steel Founders' Society of America.
40 <다이캐스팅의 특징> 부가공정이 거의 필요없는 정밀제품 대량생산 용탕을 금형에 고속/고압으로 주입하고 완전 응고할 때까지 계속 가압우수한 표면상태와 복잡한 형상 가능각종 자동차부품 (fuel pump body, transmission housing, engine block)가전제품의 부품사무용품의 부품일반 기계부품완구, 레저용품
41 Topic: 원심주조 주형을 예열하여 회전시켜 원심력을 이용하여 용탕주입 주물 내면의 냉각은 느린 편(복사열) 종류 HYDRAULIC TURBINE GUIDE BEARINGTopic: 원심주조주형을 예열하여 회전시켜 원심력을 이용하여 용탕주입주물 내면의 냉각은 느린 편(복사열)종류진원심주조 : 인장강도가 높은 주강관, 주철관반원심주조 : 철도 차륜센트리퓨징(centrifuging) : 탕구봉 둘레도 소형 주형을 다수 설치FOR NUCLEAR GENERATING STATION
42 Centrifugal CastingFIGURE Schematic illustration of the centrifugal casting process. Pipes, cylinder liners, and similarly shaped hollow parts can be cast by this process.
43 Semicentrifugal Casting FIGURE (a) Schematic illustration of the semicentrifugal casting process. Wheels with spokes can be cast by this process. (b) Schematic illustration of casting by centrifuging. The molds are placed at the periphery of the machine, and the molten metal is forced into the molds by centrifugal forces.
49 Crystal GrowingFIGURE Two methods of crystal growing: (a) crystal pulling (Czochralski process) and (b) floating-zone method. Crystal growing is especially important in the semiconductor industry. (c) A single-crystal silicon ingot produced by the Czochralski process. Source: Courtesy of Intel Corp.
50 Melt-Spinning Process FIGURE (a) Schematic illustration of the melt-spinning process to produce thin strips of amorphous metal. (b) Photograph of nickel-alloy production through melt-spinning. Source: Courtesy of Siemens AG.
51 Economics of CastingFIGURE Economic comparison of making a part by two different casting processes. Note that because of the high cost of equipment, die casting is economical mainly for large production runs. Source: The North American Die Casting Association.
52 Lost-Foam Casting of Engine Blocks FIGURE (a) An engine block for a 60-hp 3-cylinder marine engine, produced by the lost-foam casting process; (b) a robot pouring molten aluminum into a flask containing a polystyrene pattern. In the pressurized lost-foam process, the flask is then pressurized to 150 psi (1000 kPa). Source: Courtesy of Mercury Marine