금형강 STD11의 가공방법이 표면특성에 미치는 영향

최계광,남원종,이용신,Choi, Kea-Kwang,Nam, Won-Jong,Lee, Yong-Shin 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.3

The performance and life of a die are influenced by the machining methods. In order to examine the effects of machining methods on surface charactenstics, simple experiments are devised and performed. A die steel STD11, commonly used as a die material in press working, is selected. Three ways of machining methods to manufacture a die are considered. Those are (1) milling and then grinding, (2) wire-cut electric discharge dachining (W-EDM) and (3) heat treatment after W-EDM. The resulting surface roughnesses are measured. Also, the changes of surface microstructures are investigated using the scanning electron microscope(SEM) with energy dispersive X-ray spectrometer(EDS) and the results are discussed in details.

자동차 타이어에 장착된 휠의 강도 해석에 관한 연구

최계광,조재웅 한국기계기술학회 2020 한국기계기술학회지 Vol.22 No.6

In this study, the structural analyses were carried out with the old and new wheel models installed at the automotive tires. The stress and deformation at the middle circumference of wheel were seen to be greatest at two models. Also, the stress and deformation were smallest at the edge of wheel. The maximum deformation of the old model B is about five times larger than that of the new model A. The maximum equivalent stress of the old model B can be seen to be twice as large as the new model A. Also, it can be seen that the new model A is more stable than the old model B in terms of strength. It can be seen that the deformation energy of the old model B is 19 times larger than that of the new model A. And it is thought that the new model A is much more durable than the old model B in terms of impact. By utilizing this study result, the stress and deformation are investigated without the strength test of wheel installed at the automotive tire, and the durability can be seen.

씨마트론 E 다이 디자인을 활용한 스트립레이아웃 설계

최계광,Choi, Kye-Kwang 한국금형공학회 2008 한국금형공학회지 Vol.2 No.3

It is important factor to design the strip layout drawing according to product properties in press die design. Press dies are important processes in production such as a car component, house electronics, computer parts etc. In this paper, the strip layout of parts was designed for transfer dies. Results of this study can be modify the punch, trim position and notching shapes of strip layout. Utilization ratio was 70.3% by conducting piercing and notching for scrap design and materials were arranged with wide width of blank layout.

A Comparative Analysis on Fracture Behaviors of 3- Point Bending Specimens Made of CFRP and Metal

최계광,조재웅,황규완 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.2

As the composite material of fiber reinforced plastic has the high strength with light weight unlike exiting metal materials, its usage is being gradually increased. In this study, the fracture behaviors are investigated with CFRP and existing metals of aluminum, brass and structural steel by 3-point bending test. As existing metal materials, the maximum reaction forces of 2250 N, 2500 N and 2400 N occurred at aluminum, brass and structural steel respectively. In contrast, the maximum force of about 4000 N was shown at CFRP. This study result can be applied to the durable design of composite structure.

전동킥보드의 형상에 따른 정면충돌시 구조해석에 관한 연구

최계광,조재웅 한국기계기술학회 2020 한국기계기술학회지 Vol.22 No.3

In this study, the deformation, equivalent stress and strain energy were analyzed on the electric kick board emerging as a new means of transportation at the accident of a front collision according to each shape were analyzed. The largest part deformation happened at the handle, and the board part where the person’s feet was placed was seen to become weak. The equivalent stress was most visible at the board section, unlike the deformation results. In particular, the deformation and stress of model A which has a long and thin neck, have occurred greatly. Therefore, the longer the neck, the greater the deformation and stress occur. Among all models, the deformation and stress were the smallest at model C. As model A has a particularly thinner neck and board connection part, a large strain energy appeared. Therefore, it is considered that the connection needs to be reinforced thickly and firmly. On the study result, the thicker the board part of the electric kick board and the lower the body of the vehicle, the safer it is. The results of this study can be effectively applied to investigate the values of stresses and deformations, and strain energies through structural analysis without the fracture test at the front collision according to the shape of electric kick board.

자동차 난방 시트의 구조에 따른 열응력 해석에 대한 융합 연구

최계광,조재웅 한국융합학회 2019 한국융합학회논문지 Vol.10 No.7

Because the warm and cozy demand of automotive driving seat increases, the research development of heating seat has been actively made. In this study, the thermal stress analysis and the structural analysis were carried out with three kinds of heating seats of A, B and C. By executing the thermal analysis with the same material, model A was shown to have the heat transfer better than model B or model C at the study result. So, it could be seen that the heat transfers became different each other though models had the same material according to the configuration of product. Adding the hot wire in order to expect the safer heating can be better heating, but there is the limit on the aspect considering the capability in contrast to the price of product. Generally, model B is thought to be safest thermally than model A or model C in every respect. As the design data of the automotive heating seat product with the durability and safety acquired by this study result are used, the artistic environment can be promoted by being grafted onto the automotive driving seat. 자동차 운전석의 따뜻하고 쾌적한 요구가 증가하고 있기 때문에 난방 시트의 연구 개발이 활발히 이루어지고 있다. 본 연구에서는 세 가지의 난방 시트 모델 A, B, C를 가지고 열응력해석과 구조해석을 시행하였다. 똑같은 재질로 열해석을 함으로서, 연구 결과에서는 모델 A가 모델 B나 모델 C보다 더 좋은 열전달을 가짐을 보여주었다. 이로써 모델들이 제품의 형상에 따라 같은 재질을 가졌다고 하더라도 열전달들이 서로 다른 것을 알 수 있었다. 더 안정적인 난방을 기대하기 위해 열선을 추가하는 것은 더 좋은 난방이 될 수 있지만 제품의 가격대비 성능을 고려한 측면에서 한계가 있다. 전반적으로 모든 면에서 모델 B가 모델 A나 모델 C보다 열적으로 가장 안전하다고 사료된다. 본 연구결과에 의하여 취득한 내구성과 안정성 있는 자동차 난방 시트 제품의 설계데이터를 사용하여 자동차 운전석에 융합하여 그 예술적인 분위기를 조성할 수 있다.

소형 자동차의 머플러 형상에 따른 유동에 관한 융합 연구

최계광,조재웅 한국융합학회 2021 한국융합학회논문지 Vol.12 No.1

본 연구에서는 자동차 머플러의 형상별 유동해석을 수행하여 가장 유동성을 증가할 수 있는 설계 모델을 찾는 데에 있다. Model B가 최대 압력이 비교적 가장 작게 나오고 Model C가 가장 크게 나왔다. 자동차의 머플러 형상에 따른 최고의 유동 속도를 비교하면 Model A가 비교적 입구 및 출구에서의 유동의 흐름이 원활했다. 그러나 Model B는 머플러 내에서의 유동 속도는 크지만 출구에서는 유동 속도가 가장 적어져서 유동의 효율성은 떨어져 보인다. 머플 러의 형상에 따른 유동 해석 결과에 의하여 좀 더 유동이 원활한 모델을 찾음으로서 머플러를 효율적으로 설계할 수 있다고 사료된다. 본 연구 결과를 이용하면 실제 실험을 하지 않아도 소형 자동차의 머플러 형상에 따른 유동을 조사할 수 있다. 또한 소형 자동차의 머플러의 미적인 융합 설계에 도움이 될 수 있다고 보인다. The flow analysis by each configuration of automotive muffler in this study was carried out. And it aims at finding the design model that can increase the flow property best. It is shown that model B has the lowest maximum pressure and model C has the largest. Compared with the best flow rate according to the shape of the automotive muffler, model A had the comparatively smooth flow stream at the entrance and exit. However, model B has the largest flow rate in the muffler but the least flow rate in the exit, making it look less efficient. By the flow analysis result according to the muffler configuration, it is thought to design the muffler effectively by looking for the model with more smooth flow. The result of this study can be used to investigate the flow according to the configuration of small car muffler without actual test. It also seems to be helpful in the aesthetic convergent design of small car muffler.

후륜 토션빔 서스펜션에 대한 구조해석에 의한 융합연구

최계광,조재웅 한국융합학회 2019 한국융합학회논문지 Vol.10 No.9

In this study, the structural and fatigue analyses were carried out according to the configuration of rear wheel suspension of torsion beam. Three types of models similar to the actual torsional beam suspension are analyzed and we will find out which one is best on strength. The models of torsion beam suspension were designed in three types of models A, B and C through CATIA program and the results of structural and fatigue analyses were obtained by using the ANSYS program. We will confirm which model is better structurally than other models. According to the analysis results, the deformation happens to be the largest in the middle, and model B has the least deformation compared to model A and C. Similarly, model B is shown to have the smallest result at equivalent stress. So, model B is judged to be the best in terms of its strength, and it is thought to be the most efficient to converge into art design at the suspension design with a torsion beam of rear wheel. 본 연구에서는 토션빔 후륜 서스펜션의 형상에 따른 구조 및 피로 해석을 하였다. 실제 토션빔 서스펜션의 형상과 비슷한 3종류의 모델들을 해석하여 어떤 것이 강도상에서 가장 좋은 지를 알아본다. 토션빔 서스펜션의 모델들은 CATIA프로그램을 통하여 Model A, B, C 3종류로 설계하였고 ANSYS 프로그램을 이용하여 구조 및 피로 해석의 결과들을 얻었으며, 어떤 Model이 다른 모델에 비해 더 나은 구조적 형상인지 확인한다. 해석 결과에 따르면 변형은 주로 가운데 부분에서 가장 크게 발생하며 Total deformation의 경우 Model B가 model A, C 에 비하여 변형이 가장 적었다. 마찬가지로 Equivalent stress에서도 Model B가 가장 작은 값이 나타난 것으로 보아 Model B가 가장 강도적인 면에서 가장 좋은 것으로 판단되었으며, 후륜 토션빔 서스펜션 설계 시에 디자인 예술과 융합하는 것이 가장 효율적이라고 사료된다.

데스크 탑 컴퓨터내에 팬의 형상별 유동 성능 해석에 관한 연구

최계광,조재웅 한국기계기술학회 2020 한국기계기술학회지 Vol.22 No.4

In this study, by analyzing the flow rate and the pressure applied to the fan for the flow of air with room temperature into the fan in desktop computer, it was investigated which model was suitable for flow resistance. When comparing the speed distribution of air flow by model according to fan shape, model A was able to confirm that the fan performance was not good but the external flow was widely distributed. And model B was able to know that the performance was good but the external flow was smaller. Model C was found to have good performance and a wide distribution of outer flow. In cases of three models, it was equally shown that the pressure was highest on the blade side of the inlet where the air enters. Model B receives more pressure than models A and C when the same air flow rate is applied, so models A and C are considered more efficient cooling fans than model B. When considering the flow rates and the pressures acting on the model, model C is thought to have relatively good performance. By utilizing this study result, the flow rate and pressure are investigated without flow experiment by the shape of fan in desktop computer, and the flow capacity can be seen.

대형 상용 트럭의 시트에서의 형상 별 구조해석

최계광,조재웅 한국기계기술학회 2020 한국기계기술학회지 Vol.22 No.5

In this study, the structural analyses were conducted for each model by applying the loads into the design of a large commercial truck seat. Model C with three vertical frames has the smallest total deformation among all models, indicating the strongest stiffness. The maximum total deformation of model C was shown to be 0.68 times smaller than that of model A and 0.79 times smaller than that of model B. The equivalent stress of model C was also shown to be the lowest, indicating the greatest stiffness. The maximum equivalent stress of model C was shown to be 0.8 times smaller than that of model A and 0.91 times smaller than that of model B. At the upper part of the seat or the part where the force was applied, all three models were shown to have the largest total deformations and equivalent stresses. If the result of this study is applied to the design of automotive seat frame, it is thought that the durable and rigid sheets can be manufactured efficiently. By utilizing this study result, the equivalent stress and total deformation are investigated without the real experiment by shape at the seat of large commercial truck, and the durability and rigidity can be seen.