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.

MACHINING CENTER를 利用한 鏡面加工에서 表面粗度에 관한 硏究

최재용,전언찬 東亞大學校 海洋資源硏究所 1993 硏究論文集 Vol.6 No.1

This study has been performed to experiment of plastic metallic mold KP-4M on the variation of spindle revolution, feedrate, polishing times, grain size, and the pressure adding to tool.The results obtained from this study are as follows : 1. Surface roughness(Ra) grows worse, as the velocity is lower in the area of low revolution, and the velocity highter in the area of high revolution. 2. Above 1500rpm at the spindle revolution, Ra grows worse if polishing times (N) is less than 2 because of the preceding process, and the surface turn brillant if polishing times more than 4 because of loading. 3. As the higher pressure which adding to a tool is better when we expect more manufacturing quantity, and we need low pressure when surface roughness take precedence of quantity. 4. On the basic of the experimental findings, it is possible to be automatic of mirror like finishing with the machining center.

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.

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.

전극의 재료와 크기가 전극소모에 미치는 영향

전언찬 한국마린엔지니어링학회 1999 한국마린엔지니어링학회지 Vol.23 No.5

This study has been performed to investigate REW(relative electrode wear) in condition of vari-ous pulse-on duration using the copper and graphite electrode with change of the electrode size on the heat treated STD11 which is extensively used for metallic molding steel with the EDM. The results obtained are as follows; a) Graphite has much benefits than copper electrode when rapid machining is done without electrode wear, b) Neative REW result from the electrode that is very liable attach to decomposition carbide c)Increasing of machining time cause to increase wear length of the copper electrode and decrease wear length of the graphite electorde d)The more pulse-on duration copper electrode has the less REW. e) The edge portion of the electorde wears remarkably at the beginning of machining,.

자동차 바디용 강판의 열처리 특성에 관한 연구

김순경,김문경,전언찬 東亞大學校 1998 東亞論叢 Vol.35 No.-

As demand for various kinds and small lot products has been increasing, batch annealing has been appreciated for its small restriction for the operation. The cold spot of the coil is very important in the BAF(Batch annealing furnace) annealing process. Because of the annealing cycle time in the BAF, annealing was decided on the cold spot of the coil Development on the mechanical properties of steel sheet for the automobile body panel is very important in the BAF annealing process. Because of the heat treatment method in the BAF, mechanical properties was decided on the heat treatment method of the coil. So, we tested on the development of mechanical properties according to heat treatment method at the annealing furnace using the Ax atmospheric gas and the HNx atmospheric gas. As a result of several investigations. We confirmed the following characteristics mechanical properties was changed under the influence of the annealing cycle and the atmospheric gas. The cold spot of coil was the mid point of the B coil in the Ax atmospheric gas. And, atmospheric gas is very important in the high convection annealing furnaces. And so, we tested the effect, variation of cold spot, for hydrogen contents of atmosphric gas at the annealing furnace. As a result of several investigations. We confirmed the following characteristics after the heating and soaking, the cold spot of coil moved to 1/3 of coil thickness in the HNx atmospheric gas, but the mid point of the coil thickness is the cold spot in the Ax or H2 atmospheric gas. Therefore, the use of hydrogen instead of nitrogen as the protective gas, combined with high convection in batch annealing furnaces, has shown that considerable increases n furnace output and material quality are attaninable. 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.

조질 압연용 작업롤의 조도가공에 관한 연구

전언찬,김순경 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.4

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.

강판의 자동 형상제어 장치의 특성에 관한 연구

전언찬,김중완,김문경,김순경 동아대학교 공과대학부설 생산기술연구소 1996 生産技術硏究所硏究論文集 Vol.1 No.2

In this paper, the performance and functions of automatic flatness control system installed on the 4 hi-reversing mill and has been investigated under actual conditions. A new automatic flatness control system incorporates a measuring roll for measurement and correction calculations, hydraulic roll benders, selective roll cooling, and a programmable controller forinterface and data logging. The test results are as following. The more the exit steel strip thickness is thick, the smaller the I value, and the more it is thin, the larger the I value. And, a complex distribution of strip tension was controlled, for example, not only a quarter buckle but also a simple center wave and edge wave. Because the tension deviation is larger at acceleration speed and deceleration speed than steady speed. so automatic flatness control system of contact type is better to adopt over 450 m/min, automatic flatness control system reduces rapidly large flatness deviation. The maximum I value of strip has been decreased to 13 I, and defects caused by poor flatness have been drastcally decreased. And coolant temperature for work roll cooling system on the automatic flatness control system is better to adopt about 50-55℃.

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.