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문상돈,오성훈 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2002 工學硏究 Vol.33 No.-
Metal cutting leaves a plastically deformed layer in the machined surface. This deformed layer affects in various forms to the physical properties of machined components such as the dimensional instability, the micro crack. These physical properties is called surface integrity which is very important in precision cutting. In this study, we introduce plastic strain, surface roughness, cutting force to evaluate surface integrity of machined surface, and examine mutual relation of these parameters.
CBN 공구의 형상이 고경도강의 절삭특성에 미치는 영향
문상돈,김태영 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.5
The purpose of this investigation is experimentally to clarify the machinability and optimum tool geometry on milling of hardened STD11 steel. In the finish process of face milling of high hardened STD11 steel by CBN tool, the optimum tool shape is suggested, which can minimize the tool fracture and chipping by impact. It is measured that cutting force, tool wear and surface roughness generated during single-insert face milling using various geometric CBN tools. It has been found that the optimal chamfer angle of CBN too is about-25°and the suitable chamfer width is 0.2mm. The nose radius of tool is the most excellent at 1.2㎜ in the viewpoint of tool wear and surface roughness.
자기연마법에 의한 파인세라믹 Bar의 가공특성에 관한 연구
문상돈,Takeo Shinmura,Hitomi Yamaguchi,Toshio Aizawa,조철용 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
In this paper, the possibility of high precision machining was confirmed by using magnetic abrasive finishing process with rotating fine ceramic bar in high speed. Also, in order to improve the surface roughness, it was used the vibration of the magnetic pole and the mixed grain which is mixed with diamond paste for ultra precision processing and electrolytic iron powder. As a result, we knew that there is closely connected with diamond grain size, change of quantity and vibration of the magnetic pole to surface roughness of ceramic bar.
난삭재인 STD11 강의 정면밀링가공시 절삭특성에 관한 연구
김형석,문상돈,오성훈 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2003 工學硏究 Vol.34 No.-
Wear and fracture mode of ceramic tool for hardened Std11 steel was investigated by face milling in this study. The cutting force and acoustic emission(AE) signal were utilized to detect the wear and fracture of ceramic tool. The following conclusions were obtained : (1) The wear and fracture modes of ceramic tool are characterized by the three types : ① wear which has normal wear and notch wear, ② wear caused by scooping on the rake face, ③ large fracture caused by thermal crack in the rake face. (2) The wear behaviour of ceramic tool can be detected by the increase of mean cutting force and the variation of the AE RMS voltage. (3) The catastrophic fracture of ceramic tool can be detected by the cutting force(Fz-component). (4) As the hardness of work material increased, acoustic emission RMS valve and mean cutting force(Fz) increased linearly, but the tool life decrease.
오성훈,문상돈 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2003 工學硏究 Vol.34 No.-
In-process detection of cutting condition is more and more important. In-process monitoring of surface roughness and tool wear is important for improving productivity. This paper is concerned with on-line monitoring of tool wear and surface roughness. Cutting force signals are used to monitor the tool condition. This experimental study deals with the relations between cutting force signals and surface roughness in end milling.
장이간 이뇨제 남용중인 특발성 또는 자가획득 부종간의 병태생리의 차이
민경환(Kyung Hwan Min),김호중(Ho Jung Kim),유준호(Jun Ho Ryu),한상웅(Sang Woong Han),강석우(Seok Woo Kang),문중돈(Jung Don Mun) 대한신장학회 2000 Kidney Research and Clinical Practice Vol.19 No.1
N/A Patients suffering from idiopathic or self-induced edema are uniformly characterized by chronic use of furosemide, which leads to vicious cycle of edema. Among chronic furosemide users who don't have any other specific edema forming diseases, 9 patients from the outpatient clinic(OC) and 6 patients examined at the emergency room(ER) used it mainly for weight reduction and for cyclical edema, respectively. All of the ER group patients were presented with severe hypokalemia(2.04±0.2mEq/L; range 1.3 to 2.7 mEq/L) and alkalosis(748±0.01; range 7.44 to 7.51) but none from the OC group showed such results. Other baseline parameters including Plasma renin activity(PRA) and aldosterone level on recumbency, and FEn₂were similar in both groups. In contrast, daily working hours(6.1±0.5 vs 10±0.6hr, p<0.01), average body weight gain between AM and PM(0.4±0.1 vs 0.9±0.lkg, p<0.01), peak weight gain interval(9±0.8 vs 5±0.1day, p<0.05), PRA(7.6±1.5 vs 23.5±7.2ng/ml/h, p<0.05) and aldosterone level(22.1±4.2 vs 64.8±10.4 ng/dl, p<0.01) on ambulation, and FEk. on normokalemia(ll±2A vs 36±7.7%, p<0.01) were statistically different between the two groups. In comparison to the OC group, both the amout of urine(617±39 vs 358±26ml, p<0.01) and the percent change of PRA(-14±4 vs -3±2%, p<0.05) and al-dosterone level(-17±5 vs -4±3%, p<0.05) after saline loading(lL over 1hr, IV) following ambulation were smaller in the Elt group. Moat of the ER group patients(5/6) required aldosterone antagonist (spironolactone) added to K(+) supplement, but all of the OC group patients were managed to maintain an edema-free status with conservative treatment. In conclusion, patients with idiopathic edema seem to have more fluid transudation out of intravascular space during orthostasis with a prominent degree of deranged renin-aldosterone axis and K(+) metabolism than those with self-induced edema.
Sang-Pil Mun(문상필),Sang-Hwa Jung(정상화),Chang-Il Kim(김창일),Sang-Don Kim(김상돈),Mutsuo Nakaoka 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
This paper presents a novel prototype of ZCS-PFM high frequency series resonant inverter using IGBT power module for electromagnetic induction eddy current-heated roller in copy and printing machines. The operating principle and unique features of this voltage source half bridge inverter with two additional soft commutation inductor snubber are presented including the transformer modeling of induction heated rolling drum. This soft switching inverter can achieve stable zero current soft commutation under a discontinuous and continuous resonant load current for a widely specified power regulation processing. The experimental results and computer-aided analysis of this inverter are discussed from a practical point of view.
자기연마법에 의한 파인세라믹 Bar의 가공특성에 관한 연구
문상돈(Sang-Don Mun),Takeo Shinmura,Hitomi Yamaguchi,Toshio Aizawa,조철용(Chul-Yong Cho) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
In this paper, the possibility of high precision machining was confirmed by using magnetic abrasive finishing process with rotating fine ceramic bar in high speed. Also, in order to improve the surface roughness, it was used the vibration of the magnetic pole and the mixed grain which is mixed with diamond paste for ultra precision processing and electrolytic iron powder. As a result, we knew that there is closely connected with diamond grain size, change of quantity and vibration of the magnetic pole to surface roughness of ceramic bar.
논문 : 탄소섬유강화 복합재료의 자기연마 가공에 대한 표면특성
문상돈 ( Sang Don Mun ),송준희 ( Jun Hee Song ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.7
Carbon fiber reinforced plastics (CFRP), which have been developed for their high mechanical properties, are insufficient to secure machinery. This paper investigates the use of magnetic abrasive finishing methods and the characteristics of surface roughness for mirror machining of CFRP. The cylindrical surface of CFRP was ground using a diamond paste with sizes of 0.1, 0.5, 1 and 6㎛. Consequently, an effective surface roughness of 0.03㎛(Ra) could be obtained via a paste size of 0.5㎛. The surface roughness was not improved due to epoxy abrasion between the carbon fiber and the epoxy.