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Programmable Calculator 에 의한 Cupola 의 열정산 (熱精算)
강춘식,김동환 ( Choon Sik Kang,Dong Hwan Kim ) 한국주조공학회 1983 한국주조공학회지 Vol.3 No.1
In this paper, the cupola heat balance has been carried out by using programmable calculator with BASIC language. Computers tend to be used in almost every fields but for many people, computers are not handy yet because of its high equipment cost and its difficult language system. In view of this fact, a desk-top or a hand-held programmable calculator is the pertinent device in its calculation speed, accuracy, and easy programming language (BASIC), let alone its low cost. There have been some attempts to apply them to the foundry, but they are little in number. This paper is the first attempt to apply the programmable calculator to the calculation of the cupola heat balance. After several applications in some practicalcases, the program has resulted in very satisfactory results such as saving of time and accuracy.
강춘식 ( M . Karokaro,Choon Sik Kang,C . R . Loper ) 한국주조공학회 1990 한국주조공학회지 Vol.10 No.2
주물의 응고순서는 주물의 품질을 결정하는데 가장 중요한 요소이다. 이런 응고를 결정하는데 가장 큰 역할을 하는것은 시보리노프의 식인데 이 식을 이용하여 주형에서의 용탕의 통로나 압탕의 크기 및 위치를 결정하는데 효과적으로 사용하고 있다. 그러나 실제의 복잡한 주물에서는 각 부분에서의 모듀러스를 결정하는데 어려움이 있고 그 결과 여러가지 모듀러스를 결정하는 방법들을 제시하기에 이르렀다. 가장 보편적인 방법으로서는 주물의 단면을 무한대한 판이나 봉 또는 T 또는 L형이라고 생각하고 모듀러스를 결정 하는 것이다. 본 연구의 목적은 상업적으로 쓰이고 있는 주물을 몇가지 단순한 모양으로 분활하고 이때 모듀러스에 미치는 R의 크기, 주형재료, 단면의 두께 등이 응고순서에 미치는 영향을 콤퓨터에 의해 계산하였다. 이 결과는 주물의 압탕을 설계하거나 위치를 결정하는데 뿐만 아니라 주물의 설계를 콤퓨터화 하는데도 중요한 역할을 할것이다. N/A
17-4PH 스테인레스강의 기계적 , 화학적 성질에 미치는 회수재의 사용과 조성변화의 영향
이선호,강춘식,이경환,김도경 ( Seon Ho Lee,Choon Sik Kang,Kyong Hwan Lee,Do Kyong Kim ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.2
N/A Mechanical and chemical properties of the 17-4PH have been investigated after recycled melting. As the result, it has been ascertained that the change of Ni, Cu, Nb, C amount affects the mechanical and chemical properties. It is important to minimize contamination of impurities and to control the amount of Ni, Cu, Nb, C.
최상호,강춘식 ( Sang Ho Choi,Choon Sik Kang ) 한국주조공학회 1988 한국주조공학회지 Vol.8 No.4
N/A The influences of some casting conditions on bonding ratio and state at bonding zone of stainless steel-cast iron dual tube produced by centrifugal casting process were investigated to estimate fabrication technics. 1) Bonding ratio is increasing such as increasing of inner surface temperature of outer metal(stainless steel STS 304), if pouring temperature of inner metal (cast iron) is constant. 2) The more pouring temperature of inner metal (cast iron) increase, the more bonding ratio increase when inner surface temperature of outer metal (cast iron) is constant. 3) As the mold rotary speed is increase, the hatching area of bonding map (perfect bonding area) goes down to the low pouring temperature of inner metal. 4) In order to predict bonding state of two different metal, we are able to make and use the bonding map about casting conditions such as inner surface temperature of outer metal, pouring temperature of inner metal and mold rotary speed.
Cr 합금주철-주강의 원심주조 복합재 제조에 관한 연구
신현우,강춘식,이진형 ( Hyun Woo Shin,Choon Sik Kang,Zin Hyoung Lee ) 한국주조공학회 1989 한국주조공학회지 Vol.9 No.2
N/A Bonding of outer metal(low Cr-alloyed cast iron) and inner metal(cast steel) by centrifugal casting process is difficult to obtain ideal bonding because melting point of inner metal is higher than that of outer metal. Bonding is depended on mold rotary speed, melt pouring temperature, pouring position and pouring speed. Optimum bonding conditions were obtained at the range of bonding ratio 95% and mixing ratio 20% by using bonding map. Increasing of mold rotary speed expanded perfect bonding range but optimum bonding range was narrower at 1300rpm than 1000rpm according to mixing of two layers. In the case of outer metal surface temperature was lower than 110℃ when mold rotary speed was 1000rpm, perfect bonding could not be obtained even though inner metal pouring temperature was up to 1650℃. Bonding zone of two different metal made by casting process was dominated by fusion bonding. By testing the mechanical properties of bonding zone, the critical casting condition in bonding map could be obtained and the sound fabrication of composite material could be possible.
원심주조법에 의한 주철-Babbitt Metal 복합관 제조에 관한 연구
이충도,강춘식 ( Chung Do Lee,Choon Sik Kang ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.1
N/A Conventional manufacturing process for cast iron-babbitt metal composite is complicate and bimetallic bonding by centrifugal casting is also difficult because their melting point is largely different and nonmetallic inclusion exists on outer shell. This study is aiming to simplify multistage process by adding Cu-powder as insert metals during cast iron solidification. The variables on fabrication of composite pipe are mold rotating speed and inner surface temperature of outer metal. The optimum temperature range for fusion bonding between cast iron and Cu-layer was 1100℃-1140℃ in case of mold rotating speed was 700rpm. When the inner surface of Cu-layer was at 900℃, the value of interfacial hardness between Cu-layer and babbitt metal were higher than Cu-matrix by forming diffusion layer, interfacial products between Cu-layer and babbitt metal are proved to be Cu_6Sn_5(η)by XRD.
원심주조한 스테인리스강-주철 이중 복합관의 기계적 성질에 관한 연구
최상호,강춘식 ( Sang Ho Choi,Choon Sik Kang ) 한국주조공학회 1988 한국주조공학회지 Vol.8 No.2
N/A The influences of some casting conditions on the variation of mechanical properties of stainless steel-cast iron dual tube produced by centrifugal casting process were investigated. 1) Bonding zone thickness was increased from 0.5㎜ to 3㎜ and also bonding shear strength from 40㎏/㎟ to 50㎏/㎟ as mold rotary speed increasing from 400 rpm to 1300 rpm. 2) In case of inner metal pouring temperature from 1250℃, bonding zone thickness and bonding shear strength was increased from 0.5㎜ to 6㎜, from 40㎏/㎟ to 50㎏/㎟ repectively, but at 1250℃ pouring temperature it was abruptly decreased to 5㎏/㎟ because of imperfect bonding. 3) Microhardness of bonding zone of stainless steel-cast iron dual tube came to 590 Vicker`s hardness because the bonding zone was made into Fe-Cr-Ni-C system alloy.