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복합곡면 가공시 공구간섭의 탐지와 공구경로 수정에 관한 연구
서태일,조명우,조재형 한국공작기계학회 1999 한국생산제조학회지 Vol.8 No.6
In this paper we deal with interference problem in the case of compound surface machining. A new tool interference detection and correction method based on the envelope of the tool path is suggested to identify and correct the tool interference - not only within the local path of tool movement, but also outside of the tool path. Therefore, the developed strategy can be used to check the possible interference in any region of the surface. In order to analyze quantitatively the milled surface errors produced by the tool interference, improved surface prediction model is also suggested in cutting process by general cutters. The effectiveness of th proposed method is demonstrated through simulation study.
다구찌 방법에 기초한 단면절삭에서 절삭파라미터 영향에 관한 연구
장성민,조명우 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
In this paper, object of experiment is to study on the effect of cutting parameters to obtain optimal surface toughness in face turning. Surface roughness is significantly important to be high quality of parts produced by turning process. For this purpose, the optimization of cutting parameters for face turning operation is investigated applying the Taguchi method. An orthogonal array, signal-to-noise ratio, and the analysis of variance are employed to evaluate effect of cutting parameters for face turning. Also confirmation tests were performed to make a comparison between the results predicted from the mentioned correlations and the theoretical results. Cutting experiment is performed without cutting fluid using coated tungsten carbide inserts about workpieces of SM45C.
서태일,조명우 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.4
The main goal of our research is to compensate the milled surface errors induced by the tool deflection effects, which occur during the milling process. First, we predict cutting forces and tool deflection amount. Based on predicted deflection effects, we model milled surface shapes. We present a compensation methodology, which can generate a new tool trajecto-ry, which is determined so as to compensate the milled surface errors. By considering manufacturing tolerance, tool path compensation is generalized. To validate the approaches proposed in this paper, we treat an illustrative example of profile milling process by using flat end mill. Simulation and experimental results are shown.
윤길상,조명우,이홍희 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.5
A feature-based inspection planning system is proposed in this research to develop more efficient measuring mthodolog for the OMM(On-Machine Measurement) or CMM(Coordinate Measuring Machine) for complicated workpiece having man; primitive form features. This paper is proposed solution that optimum inspection sequence of the objective features. The sequences are determined by analyzing the feature information such as the nearest relationship and the possible probe-approach direction(PAD) of the features, and forming feature groups. A series of heuristic rules are developed to accomplish in Also. each feature is decomposed into its constituent geometric elements for inspection process, and then the number c sampling points, location of the measuring points, optimum probing path are determined.
자기유변유체를 이용한 Fused silica glass의 미세연마공정특성에 관한 연구
이정원,김동우,신영재,장호수,조명우 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
A new, commercially available polishing process called magnetorheological fluid polishing is used to fabrication optical glass and bio-chip. This polishing process guarantees high polishing quality by controlling the fluid density electrically. The applied material in experiments is fused silica glass. Fused silica glass is widely used in the optical and biochip field because of high degree of purity. For MR polishing experiments, MR fluid was composed with DI-water, carbonyl iron and nano slurry ceria. The wheel speed and electric current were chosen as the variables for analyzing the characteristics of MR polishing process. In results, the surface roughness according to the variation of wheel speed and electric current was analyzed.
이세희,서태일,조명우 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.2
The objective of this research is to develop a measurement error compensation method for On-Machine Measurement(OMM) process based on a closed-loop configuration. Geometric error of vertical machining center arc measured using ball-bar system, and probing errors are measured using master ball. The errors are represented using homogeneous trans-formation matrices and the closed-loop configuration method is applied to calculate 3-dimensional errors. To verify the effectiveness of the method proposed in this research, compensated results are compared to the data using CMM process, and the results are analyzed. The results show the proposed method can be applied in OMM process to make the measured data more reliable.
MR Polsihing에서 알루미나 슬러리를 이용한 Si₃N₄세라믹스의 고정도 표면향상에 관한 연구
이정원,김동우,조명우,조원승,신영재 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
Silicon nitride Si₃N₄ is a leading ceramic for structural applications due to its superior properties at high temperature. It is very difficult-to-grind ceramics with high efficiency because of their high strength, hardness and brittleness. In this paper, ultra-precision surface for Si₃N₄ ceramic were using MR polishing method. MR Polishing experiment were using the magnetorheological fluid and Polishing abrasives are Al₃O₃. Polishing experiments were under various polishing conditions by changing a magnetic field force, wheel speed and polishing time. Polishing surfaces were observed analyzed by non-contact type 3-dimensional surface roughness measurement equipment. As a result, MR Polishing method can give excellent surface roughness, and surface roughness was obtained Ra=1nm.
절삭가공오차보상을 위한 기상측정 데이터기반 신경회로망의 응용
서태일,박균명,조명우,윤길상 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
This paper presents a methodology of machining error compensation by using Artificial Neural Network(ANN) model based on the inspection database of On-Machine -Measurement(OMM) system. First, the geometric errors of the machining center and the probing errors are significantly reduced through compensation processes. Then, we acquire machining error distributions from a specimen work piece. In order to efficiently analyze the machining errors, we define two characteristic machining error parameters. These can he modeled by using an ANN model, which allows us to determine the machining errors in the domain of considered cutting conditions. Based on this ANN model, we try to correct the tool path in order to effectively reduce the errors by using an iterative algorithm. The iterative algorithm allows us to integrate changes of the cutting conditions according to the corrected tool path. Experimentation is carried out in order to validate the approaches proposed in this paper.
나노 세리아 슬러리를 이용한 Stainless steel 304의 MR Polishing 특성에 관한 연구
홍광표,신봉철,김동준,조명우,신영재 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
An finishing process using magnetorheological fluid has been developed as a new precision finishing technique to obtain a fine metal surface. Therefore, magnetorheological fluids has been used for micro polishing and micro part. The applied material is 304 stainless steel. It is widely used in the semiconductor machinery and aerospace industries because of high corrosion resistance. For MR polishing process, MR fluids was consisted of carbonyl iron, DI-water and nano slurry ceria(Celexis cx 94s slurry). The wheel speed and electric current were chosen as the variables for analyzing the characteristics of MR polishing process. In the results, the surface roughness according to the variation of wheel speed was analyzed , and it was obtained 1.393nm surface roughness.
신봉철,하석재,강민형,권오양,조명우 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-
In recent, the CFRP(Carbon Fiber Reinforced Plastics) composite has been widely used because it has light-weight and high mechanical strength. Therefore, CFRP composite is applied to variable industrial areas such as aerospace, automobiles, sporting goods, ships and so on. Generally, CFRP composite has been used in the industrial field by mechanical cutting processes. In this research, the CFRP composite specimen are laminated by 64plies with orientation angles such as 0°, 45°, 90° and [0°/±45°/90°]4S. The results are analyzed with cutting force and cutting surface.