섬유 산업용 연삭숫돌의 설계 및 성형공정 개발

김상오(Sang-Oh Kim),구양(Yang Koo),하만경(Man-Kyung Ha) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-

The grinding process is dissimilar to other conventional machining methods such as turning and milling. The difference between them is due to not only the cutting edges of the grinding wheel don’t have the uniformity but also the edges act differently on the workpiece at each grinding. In spite of many researches during past decades, describing the grinding action between the grinding wheel and the workpiece was not made clearly. So statistical models and computer simulations that could overcome the variety of the cutting edges were introduced. These complexities and difficulties of illustrating the grinding process also raised an obstacle to the optimization of the grinding process and to the verification of the interrelationship between the grinding parameter and the obtained grinding result. In present paper, the finest grinding wheel for textile industry was developed by using the response surface method, genetic algorithm and Taguchi method to predict surface roughness and wear of the grinding wheel.

평면연삭에서 숫돌의 종류와 연삭조건에 따른 표면거칠기 및 연삭숫돌의 파괴

오동석,이병곤,이종훈 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.4

In this study, the variation of surface roughness was tested in surface grinding for the three winking materials SM45C, heat-treated SM45C, and gray cast iron. It was performed for the various grinding wheels with two grain size #60, #100, and three grade I,O,R and various grinding depths and feeds. The fractural grinding depths which were obtained when the grinding wheels were destructed in surface grinding works, were examined and compared with the calculated value sug-gested in this study. The results showed that the surface roughness was decreased by decreasing grinding depth, and feed, and increasing grain size and grades. The fracture grinding depths were increased by increasing grain size, grade and feed.

섬유산업응용 특수연삭 숫돌 개발 및 성능평가

하만경(Man-Kyung Ha),김상오(Sang-Oh Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6

The grinding process is dissimilar to other conventional machining methods such as turning and milling. The difference between them is due to not only the cutting edges of the grinding wheel don’t have the uniformity but also the edges act differently on the workpiece at each grinding. In spite of many researches during past decades, describing the grinding action between the grinding wheel and the workpiece was not made clearly. So statistical models and computer simulations that could overcome the variety of the cutting edges were introduced. These complexities and difficulties of illustrating the grinding process also raised an obstacle to the optimization of the grinding process and to the verification of the interrelationship between the grinding parameter and the obtained grinding result. In present paper, the finest grinding wheel for textile industry was developed by using the response surface method, genetic algorithm and Taguchi method to predict surface roughness and wear of the grinding wheel.

직조기 바늘의 초정밀 연삭을 위한 연삭숫돌 개발 및 성능평가

윤승진(Seung-Jin Yun),구양(Yang Koo),곽재섭(Jae-Seob Kwak),하만경(Man-Kyung Ha) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-

The aim of this study is to design the grinding wheel and the forming die as well as to evaluate grinding parameter's effect on the wear amount and the surface roughness. For convenance sake, the scheme of design of experiments was considered. The grade of the developed grinding wheel was tested for forming pressure and sintering conditions. The response surface models were successfully developed to predict the wear amount of the grinding wheel and the surface roughness using the experimental results. And also parameter optimization of the special purposed grinding wheel for textile industry was performed by the genetic algorithm.

연삭동력을 이용한 숫돌수명 판정

이상태,정윤교 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.4

The dressing time monitoring in cylindrical grinding is very important with respect to machining efficiency. Therefore, the purpose of this paper is to determine the wheel life by monitoring behavior of grinding power for WA, 19A and GC. For this purpose, we investigated indirectly the attritious wear of grain edge, the loading of grinding wheel and the break-age of grain through the grinding power and the surface roughness under various grinding conditions. From obtained the results, the relationship between the wheel life and the average sectional chip area is examined to guide for the determina-tion of dressing time

페라이트의 연삭저항 및 연삭면 특성

김성청,이재우 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.3

This paper aims to clarify the effects of grinding conditions on the grinding force, ground surface and chipping size of workpiece in surface grinding of various ferrites with the resin bond diamond wheel. The main conclusions obtained were as follows: In a constant peripheral wheel speed, the specific grinding energy is fitted by straight lines with grinding depth coefficient(δ) in a logarithmic graph. The effect of both depth of cut and workpiece speed on grinding energy becomes larger in the order of Mn-Zn, Cu-Ni-Zn and Sr. When using the diamond grain of the lower toughness, the roughness of the ground surface becomes lower. The ground surfaces show that the fracture process during grinding becomes more brittle in the order of Sr. Mn-Zn and Cu-Ni-Zn. The chipping size at the corner of workpiece in grinding increases with the the increases of the depth of cut and workpiece speed, and the decrease of peripheral wheel speed. The effect of both depth of cut and workpiece speed on chipping size becomes more larger in the order of Sr. Mn-Zn and Cu-Ni-Zn.

난삭재료의 연삭성 평가

이상태,이후성,정윤교 國立 昌原大學校 産業技術硏究所 2000 産技硏論文集 Vol.14 No.-

The accuracy of machinindg using grinding wheels depend upon the combined parameters that are depth of cut, the speed of workpiece and wheel, the state of wheel surface and kinds of grinding wheel. If this parameters apply inadequately for grinding work, it'll break out the abnormal states such as grinding crack and grinding burn. Therefore, this paper aims at analysing the variations of grinding forces that are closely concerned this abnormal states, proposing the normal and proper conditions of grinding work, an making up the economic grinding.

CBN 숫돌에 의한 측면연삭가공에 관한 연구

이충석(Choong-Seok Lee),김창수(Chang-Su Kim),박원규(Won-Kyue Park),이종찬(Jong-Chan Lee),최환(Hwan Choi) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.3

One of the problems in the grinding process using the machining center(MC) with a small diametric wheels is machining error due to decrease of the quill diameter. In this thesis, side-cut grinding is performed with a vitrified bonded CBN wheel on the machining center to establish the basis of the grinding using MC. The grinding force and machining error are investigated experimentally for the change of the machining condition. It is possible to estimate the machining performance by the ratio of the setting depth of cut and actual depth of cut. In addition, the relation between normal grinding force and machining error is presented by the experimental formula.

방직산업용 연삭숫돌 제작 및 성능평가에 관한 연구

김창록(Chang-Rok Kim) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.3

A weaving machine for texture industry uses a lot of needles and the nib of these needles is necessary to be kept with sharp edge. The re-grinding of the needle by a special purpose of the grinding wheel can be selected for achieving this aim. This study focused on the manufacture and performance assessment the special grinding wheel. A forming mold for the grinding wheel was designed and a sintering process for furnace process control was established. Manufactured wheels were tested for determining suitable grade of the wheel. The selection of optimal grinding conditions was achieved by a response surface method and a genetic algorithm.

페룰 가공용 초정밀 무심 연삭기의 구조적 및 열적 민감도 해석

이원재(Wonjae Lee),김석일(Seokil Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6

High-precision centerless grinding machines are emerging as a means of finishing the outer diameter grinding process required for ferrules, which are widely used as fiber optic connectors. In this study, a sensitivity analysis for structural and thermal characteristics was carried out using a virtual prototype of a centerless grinding machine to realize systematic design technology and performance improvements required to manufacture ferrules. The prototype consisted of a concrete-filled bed, hydrostatic grinding wheel (GW) and regulating wheel (RW) spindle systems, a hydrostatic RW feed mechanism, a RW swivel mechanism, and on-machine GW and RW dressers. The results of the structural sensitivity analysis illustrated that the radial stiffnesses of hydrostatic bearings greatly influenced the loop stiffness, and the results of the thermal sensitivity analysis illustrated that the heat generation rates at hydrostatic bearings and belt pulley greatly influenced the temperature rise of hydrostatic bearings and the deviation of thermal displacement between GW and RW.