• 동력기계공학회지
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• 제6권1호
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• pp.82-87
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• 2002

Not only ferrous but also non-ferrous materials such as aluminum, brass, plastic and woods need cutting operation in recent manufacturing industry. Over the past few years a considerable number of studies have been made on non-ferrous metal cutting. But more study is required to meet various engineering needs. The purpose of this paper is to preform an experiment on the influence of feed-rate adjustment and side rake angle in turning operations from non-ferrous metals. As a result, the surface roughness was reduced when a side-rake angle increases and feed-rate decreases in the case of the plastic, brass, aluminum, and paulownia. Therefore, this papers develop a new type bite that be used to adjust side-rake angle.

• 한국산학기술학회논문지
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• 제16권4호
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• pp.2430-2435
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• 2015

상품을 제조할 때 유연성을 높이기 위해서는 칩의 형상분석이 중요한 문제 중의 하나이다. 본 연구에서는 선삭 작업에서 가공 여유각 변경에 따른 피삭재의 가공특성이 어떻게 변화되는지 분석하고 자 하였다. 피삭재는 3가지로 SM45C(기계구조용탄소강), SCM415(크롬몰리브덴강), STS303(스테인리스강)을 선택하여 정해진 가공조건인 회전속도, 이송속도와 가공 깊이에 따라 분석하였다. 특히, 선삭가공에서의 칩의 형상과 인서트 팁의 마모현상을 분석하였다. 결과적으로 칩의 형상은 피삭재의 재질과 가공깊이, 이송속도에 따라 변화됨을 알 수 있었다. 가공이송속도가 0.10mm/rev일 때와 가공깊이 0.3mm일 때가 유동형 칩으로 재질이나 가공특색을 분류하지 않고 가장 좋은 형상을 보였다.

• 한국산학기술학회논문지
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• 제16권2호
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• pp.940-946
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• 2015

선삭작업에서 가공 여유각 변경은 가공특성을 변화시킨다. 본 연구에서는 피삭재로 기계구조용탄소강, 크롬믈리브텐강, 스테인리스강을 선택하여 정해진 가공조건으로 재질들의 특색이 어떻게 변화하는지 나타내었다. 피삭재의 재질별 표면거칠기를 알아보기 위하여 촉침식 표면 거칠기 측정기로 측정한 결과 인장강도가 높은 피삭재가 표면거칠기 값이 좋게 나왔다. 또한, 가공 이송속도 0.07 mm/rev와 0.10 mm/rev를 비교하였을 경우, 0.07mm/rev일 때가 재질과 관계없이 표면거칠기가 매우 좋게 나타났다. 선삭 여유각 변경에 따른 표면거칠기를 종합하여 분석하여 보면 3가지 재질 모두 $0.9^{\circ}$일 때 가장 좋은 거칠기 값을 보였으며 $0.3^{\circ}$일 때 가장 나쁜 거칠기 값을 보였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1988년도 한국자동제어학술회의논문집(국내학술편); 한국전력공사연수원, 서울; 21-22 Oct. 1988
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• pp.285-288
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• 1988

Despite of the low productivity, the manual programming for NC machining is still widly used because of it's economical reasons. In this study, the computer assisted manual programming system CAMP which assits the efficient verification of MCD(Machine Control Data) is presented. The system can detect sysntax errors, graphically display tool motions and eventually diagnose programming techniques. The case study is applied for the NC turning operations.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.876-879
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• 1995

Parallel NC machines are a new generation of machine tools aimed at increasing maching accuracy and reducing part cycle time. In addition to their capacity to perform both milling and turning operations, these machine tools can perform multiple machining operations simultaneously,involving one or more parts at a time, and can completely finish a part in a single setup. Due to the lack of a computer-aided process planning system, these machines are used in industry today as dedicated, mass-production machines. This pape presents methodology for generating optimal process plan for each parallel machine tool using a genetic algorithm.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2022년도 춘계학술대회
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• pp.24-25
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• 2022

집단 정박지인 부산항 남외항 정박지 사례를 기초로 집단 정박지 안전관리 증진을 위한 관련 규정, 정박선 선회반경 그리고 더 정확한 기상정보 수집과 현실에 부합하는 투묘위치를 적용하기 위한 시스템 관제지원 기능개선을 통한 안전관리 개선방안에 대한 제언입니다.

• 농업과학연구
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• 제42권1호
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• pp.53-61
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• 2015

Development of highly efficient and energy-saving tractors has been one of the issues in agricultural machinery. For design of such tractors, measurement and analysis of load on major power transmission parts of the tractors are the most important pre-requisite tasks. Objective of this study was to perform pre-processing procedures before effective analysis of load data of agricultural tractors (30, 75, and 82 kW) during major field operations such as plow tillage, rotary tillage, baling, bale wrapping, and to select the suitable pre-processing method for the analysis. A load measurement systems, equipped in the tractors, were consisted of strain-gauge, encoder, hydraulic pressure, and radar speed sensors to measure torque and rotational speed levels of transmission input shaft, PTO shaft, and driving axle shafts, pressure of the hydraulic inlet line, and travel speed, respectively. The entire sensor data were collected at a 200-Hz rate. Plow tillage, rotary tillage, baling, wrapping, and loader operations were selected as major field operations of agricultural tractors. Same or different farm works and driving levels were set differently for each of the load measuring experiment. Before load data analysis, pre-processing procedures such as outlier removal, low-pass filtering, and data division were performed. Data beyond the scope of the measuring range of the sensors and the operating range of the power transmission parts were removed. Considering engine and PTO rotational speeds, frequency components greater than 90, 60, and 60 Hz cut off frequencies were low-pass filtered for plow tillage, rotary tillage, and baler operations, respectively. Measured load data were divided into five parts: driving, working, implement up, implement down, and turning. Results of the study would provide useful information for load characteristics of tractors on major field operations.

• 한국정밀공학회지
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• 제9권4호
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• pp.22-35
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• 1992

In highly automated machining centers, intelligent sensor fddeback systems are indispensable on order to monitor their operations, to ensure efficient metal removal, and to initate remedial action in the event of accident. In this study, an on-line tool wear detection system for thrning operations is developed, and experimentally evaluated. The system employs multiple sensors and the signals from these sensors are processed using a multichannel autoegressive (AR) series model. The resulting output from the signal processing block is then fed to a previously tranied artificial neural network (multiayered perceptron) to make a final decision on the state of the cutting tool. To learn the necessary input/output mapping for tool wear detection, the weithts and thresholds of the network are adjusted according to the back propagation (BP) method during off-line training. The results of experimental evaluation show that the system works well over a wide range of cutting conditions, and the ability of the system to detect tool wear is improved due to the generalization, fault-tolearant and self-ofganizing properties of the neural network.

• Journal of Biosystems Engineering
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• 제31권4호
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• pp.334-341
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• 2006

This study designed to develop a mower which can reach to side of a tractor or inclined road side and operate weeding. The prototype consists of 4 parts; the base and turning equipment, the boom, the arm, the weeder. The hydraulic actuators were divided into two operations, weeding and operation of boom and they were controlled by electrical equipment. Weeding was very effective when pressure set up at $15{\ell}/min$ using weeding, as $2.27kg{\cdot}m$, 2,210rpm. Weeding range of flail mower was 1.1 to 2.6m from the center of turning equipment at a flat. In case of disk mower, it was 1.5 to 2m. As a result of operation test, flail mower was appropriate for weeding at fence and short weeds, disk mower was appropriate for long weeds.

• 한국공작기계학회논문집
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• 제10권1호
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• pp.1-9
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• 2001

The development of flexible automation in the manufacturing industry is concerned with production activities performed by unmanned machining system A major topic relevant to metal-cutting operations is monitoring toll wear, which affects process efficiency and product quality, and implementing automatic toll replacements. In this paper, the measurement of the cutting force components has been found to provide a method for an in-process detection of tool wear. The static com-ponents of cutting force have been used to detect flank wear. To eliminate the influence of variations in cutting conditions, tools, and workpiece materials, the force modeling is performed for various cutting conditions. The normalized force dis-parities are defined in this paper, and the relationships between normalized disparity and flank were are established. Final-ly, artificial neural network is used to learn these relationships and detect tool wear. According to proposed method, the static force components could provide the effective means to detect flank wear for varying cutting conditions in turning operation.