切削抵抗의 動的成分에 미치는 切削條件의 影響에 關한 硏究(Ⅱ)

全彦燦,남궁척 충남대학교 공업교육연구소 1986 論文集 Vol.8 No.3

In this study, the static and dynamic commponents of cutting resistance were measured with tool dynamometer (Swiss, piezo-electric type) when S 45 C, Al-alloy and brass were drilled under the some variable conditions. 1) The dynamic components of these cutting resistance are not related to the depth of drilled hole. 2) The static and dynamic components of cutting resistance are increased in accordance with the increase of feed and drill diameter. 3) The dynamic components of thrust force are increased in accordance with the increase of spindle speed. 4) The rate of the dynamic component to the static component is 0.3∼0.5 in torque, 0.1∼0.2 in thrust force. 5) The characteristic of the tool system is affected in dynamic component of cutting resistance, and the created frequency and amplitude of the chip are determined by the drilled materials. 6) The maximum amplitude of the dynamic component is increased proportionally in accordance with the feed rate and the spindle speed.

자동설계 모델을 이용한 최적설계 조건에 관한 연구

전언찬,김민주,이승수 東亞大學校 2001 東亞論叢 Vol.38 No.-

This study is an investigation for the ADS optimum design by using FEM. We write out program which express ADS perfectly and reduce the required time for correcting of model to the minimum in solution and manufacture result. We complete algorithm which can plan optimum forming of model by feedback error information in CAE. In rachet wheel, greatest equivalence stress originates in key groove corner and KS standard Is proved the design for security.

자동설계 모델을 통한 급속시작품 제작에 관한 연구

전언찬,이승수,김민주 東亞大學校 2001 東亞論叢 Vol.38 No.-

This study is the selection of optimum forming condition for RP system using ADS. Program using ADS reduces the required time for feedback between design and manufacturing of workpiece. When we produce rapid prototype using RP system, we investigate the relationship between Facetres in system variable number of AutoCAD and circularity of rapid prototype, and we will find optimum forming condition in RP system. keyword : Optimum forming condition(최적성형조건), RP(Rapid prototyping : 급속 성형), ADS (Automatic design system : 자동설계 시스템), Facetres(형상 간격)

조질압연 가공시 작업롤조도와 판면조도 변화에 관한 연구

전언찬,김순경 대한기계학회 1995 대한기계학회논문집 Vol.19 No.2

A study on the surface roughness variation of work roll and strip at the temper rolling was performed. The results were obtained with changes according to the surface roughness of work roll and method to make the peak count on the roll in the temper rolling, and factors to affect to the work roll surface in actual rolling machine (ie. Temper mill). The results suggests that the electro-discharge textured roll has mere uniform roughness distribution than shot blasted roll and its life time is two times longer than shot blasted because it has more sine wave roughness, and it is possible to control the Rmax. In shot blasting method, Surface roughness is related to the impeller speed, But it can't control the peak count.

X-Y 테이블에 사용되는 볼 스크류의 열팽창 억제에 관한 연구

전언찬,이승수,김민주,곽창식,장성규,한근조,김중완,박홍식,전태옥,박정보 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.2

In this paper, we have studied about the thermal expansion of the ball screw used for the X-Y table. The hollow ball type is used for the vall screw. We have compared the conventional cooling system and function with the improved cooling system and function which is developed the path providing cooling oil in hollow ball screw. That is, the temperature variation and positioning accuracy are analyzed of the ball screw. We have obtained the following result through this experiment. 1) The improved cooling system of the hollow ball screw for X-Y table was developed. 2) The improved cooling system of the hollow ball screw has a large effectiveness on restraining the thermal expansion of the ball screw. 3) The positioning accuracy of the ball screw was improved about 2∼4㎛ using temperature-controlled colling oil.

旋削加工時 버어의 生成에 관한 硏究

全彦燦 東亞大學校 大學院 1984 大學院論文集 Vol.8 No.2

Burrs formation investigated on workpiece edges in turning operation. This stusy was experimented and analyzed between cutting conditions and burrs size. Cutting conditions are cutting speed, cutting depth, feed rate, side cutting edge angle and nose radius. The results obtained are as follows. 1. The large size burrs are produced at large cutting depth and large feed rate. 2. The small size burrs are produced at large cutting depth and large nose radius. 3. The small size burrs are produced at small feed rate and small siode cutting edge angle. 4. The brittle materials easily are produced the small size burrs.

冷間壓延用 作業 롤의 Spalling 發生原因에 관한 硏究

全彦燦,全泰玉,金舜經 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.2

A study on the spalling causes of work roll for cold rolling was performed in the cold rolling mill. Performance of work roll is dependent to a great extent on spalling so that both roll manufacturers and users show great interest in spalling. So this paper shows that spalling phenomena were investigated and causes determined because of more than 85% of spalling has its origin on the roll surface. As being well known, spalling mostly occurred due to developing fatigue fracture originated a crack on a roll. But such spalling can be prevented by proper roll maintenance. The spalling accidents have sharply decreased since 1981 because of the use of ultrasonic test to detect cracks on a roll.

BAF 燒鈍의 傳熱特性과 冷延鋼板의 表面淸淨度에 관한 硏究

全彦燦,金舜經 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.2

A cold spot temperature control system for the BAF(batch annealing furnace) has been established in order to reduce energy consumption to improve productivity and stabilize the properties of products. Therefore we confirmed for the improving of material quality (eq. even and consistent tempering, high surface cleanliness, reduced carbon depositing etc.), increasing of output, comparison of annealing cycle time, reducing of annealing cost and distribution of cold spot temperature according toe BAF type. The use of hydrogen instead of nitrogen as the protective gas, combined with high convection in batch annealing furnaces, has shown that considerable increases in furnace output and material quality are attainable. Owing to the low density, high diffusion and reducing character of hydrogen, a better transfer resulting in uniform material temperatures and improved coil surfaces can be achieved.

냉간 압연용 작업롤의 제조 기술에 따른 특성

전언찬,김문경,김순경,이충엽 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1

Drill加工時 切削抵抗 動的成分에 關한 硏究

全彦燦 동아대학교 공과대학 부설 한국자원개발연구소 1987 硏究報告 Vol.11 No.2

This paper deals with the experimental study on the dynamic components of torque and thrust generated during drilling ; factors concerned are the cutting condition, material of the workpiece, and the form of the drill lip. The results are summarized as follows: (1) Dynamic components of torque have a deep relation with the speed of revolution. (2) Dynamic components of torque and thrust increase as the cutting speed increases, but the rate of increase greatly depends on the material of the workpiece. (3) Dynamic components of torque and thrust increase as the feed increased. However, for BsBM, dynamic components of torque and thrust increase sharply till the feed of 0.4㎜/rev and then decrease afterwards. (4) It is necessary to measure spectrum of nature frequency of torque to effectly estimate the drill life by use of the dynamic components.