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지용주,곽재섭,하만경 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.2
Because a generated heat h g grinding operation makes a serious deformation on a ground surface as a convex form, a real depth of cut in deformed zone has larger than an ideal depth of cut. Consequently, the ground surface has a geometric error as a concave form after cooling the workpiece. In this study, the force and the geometric error of surface grinding were examined. From evaluating magnitude and mode of the geometric error according to grinding conditions, an optimal grinding condition was proposed to minimize the geometric error. In addition, the relationship between the geometric error and the grinding force was found out. Due to least square regression, it was able to predict the geometric error by using the grinding force.
이종찬,최환,채승수,김종표,이충석 한국기계가공학회 2006 한국기계가공학회지 Vol.5 No.1
Silicon has been widely used in electronic parts as a semiconductor equipment. It, however, requires much effort to grind without microcrack and chipping because of its high hardness and brittleness. So far, many studies for the grinding of engineering ceramics have been done, but not for the grinding of silicon.In this paper, a theoretical analysis on the grinding forces is introduced. Grinding experiments were performed at various grinding conditions including grinding directions (Up grinding and Down grinding), table speeds and depth of cuts. The grinding forces were measured to compare at various grinding conditions. The experimental values agree well with theoretical ones.
박종판,박철우,이상조,Park, Jong-Chan,Park, Cheol-Woo,Lee, Sang-Jo 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.6
Cylindrical plunge grinding is widely used for final machining process of precision parts such as automobile, aircraft, measurement units. But in order to make parts which have high precision accuracy and high surface integrity, it is necessary to consider grinding characteristics due to accumulation phenomena of grinding wheel in plunge grinding process. In this study, in order to examine closely plunge grinding process, grinding power, grinding force, real depth of cut are monitored in transient state, steady state and spark out state. As the result, it is shown that grinding power and force are affected by dressing condition, depth of cut and speed ratio and that there exist threshold grinding force and it also affected by dressing condition. Also considered effects of grinding conditions on surface roughness and roundness of workpiece
문홍현,김성청,공재향,박병규,소의열,이근상 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
In this study, through the experimental results of grinding ratio, grinding force and surface roughness with the obtained wear amount of diamond wheel and ceramic material during the grinding process, the following conclusions could be found. In the case of Si₃N₄, the wear of diamond wheel is large while the grinding force is stable and the range of change in surface roughness is small. For the case of Al₂O₃ and ZrO₂, while the wear of diamond wheel is getting smaller, the grinding force is increasing but the value of surface roughness is decreasing. For grinding with the vitrified bond wheel, it seems that the self-sharpening can be found for Si₃N₄ and the glazing effect of the cutting edge for Al₂O₃ and ZrO₂.
구양 釜慶大學校 2002 釜慶大學校 論文集 Vol.7 No.-
In the grinding process, the degree of the sharpness in wheel grain affects the surface roughness and the dimensional accuracy. If a wheel with dull grains is used, the grinding force will be increased and the surface roughness deteriorated. To produce a precise component, the magnitude of parameters related to the wear amount of a grinding wheel has to be limited. In this study, a variation of the grinding force and the surface roughness were measured to get the machining characteristics of the WA and CBN wheels. Using the wear amount of the grinding wheel and the removal rate of workpiece, the grinding ratio was calculated. And also the wheel life was determined at a rapid decreasing point of the grinding ratio. The difference between the surface of wheel-workpiece before grinding and after wheel life was clearly verified with a microscopic photo.
CBN 과 WA숫돌에 의한 연삭에서 연산력과 표면거칠기 특성
하만경,곽재섭,양재용,정영득,심성보,류인일 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1
In this study an experimental investigation was conducted to find the grinding characteristics of ceramics, STD11 and STS304 materials. The grinding force and the microscopic observation of the workpieces were obtained in surface grinding. Grinding characteristics of ceramics were inspected through the microscopic examination, the cutting force, and the surface roughness. It has been found that the grinding force of ceramics is relatively low as compared to that of steels and that CBN wheel has an excellent performance. The surface roughness was measured according to the feedrate and the depth of cut.
머시닝센터를 이용한 내면 스러스트 연삭가공에 관한 연구
최환,서창연,박원규,이충석 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.4
In this paper, the grinding characteristics of internal thrust grinding were studied with vitreous CBN wheels using a machining center. Grinding experiments were performed according to grinding conditions, such as wheel feed speed and depth of cut, workpiece speed, and rate of grinding width. Additionally, the grinding force and grinding ratio were investigated though these experiments. Based on the experimental results, the grinding characteristics of internal thrust grinding were discussed.
원통연삭시 연삭휠의 종류에 따른 연삭 가공특성에 관한 연구
이충석(Choong-Seok Lee),채승수(Seung-Su Chae),김택수(Taeck-Su Kim),이상민(Sang-Min Lee),박휘근(Hwi-Keun Park),이종찬(Jong-Chan Lee) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.1
This paper reports some experimental results of cylindrical external grinding using CBN wheels. Many experimental studies for surface grinding have been done, but not for the cylindrical grinding due to the difficulty of grinding force measurement. In this paper a new experimental device has been proposed for the grinding force measurement in cylindrical grinding. The cylindrical grinding experiments were carried out at various grinding conditions with several CBN grinding wheels. The experimental results indicate that the CBN wheels with smaller grains result in the higher grinding forces in both SCM415 and STD11 workpieces. The grinding forces of all wheels were proportional to the infeed speeds and the difference of each wheels was prominent at high infeed speed for SCM415.
최환(Hwan Choi),서창연(Chang-Yeon Seo),서영일(Young-Il Seo),이충석(Choong-Seok Lee) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.1
In this paper, the grinding characteristics in internal grinding methods(plunge, thrust) were studied with vitreous CBN wheels using machining center. Grinding experiments were performed according to the same material removal rate conditions such as a wheel speed, depth of cut and workpiece speed. And the grinding force, machining error and grinding ratio were investigated though these experiments. Based on the experimental results, the grinding characteristics on internal grinding methods were compared.