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이문용(Munyong Lee),정병훈(Bunghoon Jung),김종섭(Jongsub Kim),오상진(Sangjin Oh),서정(Jung Suh) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Optimal processing and system to produce the laser welded tube for hydroforming bumper beam are studied. The calculated size of tube is a thickness of 1 .4㎜ , diameter of 105.4㎜ and length of 2000㎜. The tube is shaped from cool rolled high strength steel sheet(tensile strength: 60kgf/㎟ grade). 3 roll bending process, multi-step continuous roll forming method are studied and compared with 2 roll bending method. Weld quality monitoring and seam tracking along the butt-joint lengthwise to the tube axis are also studied. The longitudinal butt-joint is welded by the CO₂ laser welding system equipped with a seam tracker and plasma sensor. The constructed CO₂ laser tube welding system can be used for the precision seam tracking and the real-time monitoring of weld quality. The obtained laser welded tubes were made an investigation by microscopic examination and simplified hydroforming test. Finally, the laser welded tubes are going to make automobile bumper beam.<br/>
차대차 충돌시 차량형상에 따른 범퍼 손상성 평가에 대한 연구
이상제(Sangje Lee),정윤석(Yunseok Jeong),구도희(Dohoi Koo),이문용(Munyong Lee) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.5
The present low speed crash regulations and RCAR test for insurance estimate do not tend to reflect car crash occurred on a road. Therefore, car makers are trying to readjust test standard be similar to a real situation. Passenger cars and SUV vehicles on the market will be subject to this study for car to car crash. In addition, we will discuss improvement of test methods for a low speed crash and direction of bumper design by performing this impact analysis.
이경호(Gyungho Lee),김석봉(Seokbong Kim),허훈(Hoon Huh),유정수(Jungsu Yoo),이문용(Munyong Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study deals with the crashworthiness of aluminum crash box for an auto-body with the various types of cross section. For the aluminum alloy, the dynamic tensile test was carried out to apply for crash analysis at the range of strain rate from 0.003 to 200/sec. The crash analysis was carried out for three cross sections of rectangle, hexagon and octagon. The analysis result shows that the octagon cross section shape has higher crashworthiness than other cross section shapes. Effect of shape of rib in the cross section is important factor in crash analysis. Face-to-face rib shows higher specific energy absorption and lower peak load than edge-to-edge rib. The energy absorption and load are affected by the inclined angle of rigid wallin crash analysis. As inclined angle increases, peak load decreases and face-to-face rib shows high crashworthiness.
박병선(Byungsun Park),이문용(Munyong Lee),이규현(Gyuhyun Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Many studies about the development of high strength and light weight body parts are in progress and improve the fuel efficiency. One of the methods that increase strength is Surface Hardening Treatment. Laser heat treatment is an effective technique used to improve stiffness of car bodies. An experimental investigation with diode laser system was carried out to study the effect of heat treatment on the boron steel. The table of the test term was drawn up by temperature of laser heat treatment, speed and cooling. The heat treatment characteristics of the laser beam are analyzed using hardness tests. The dimension in heat treatment part and heat treatment part zone was also measured through vickers hardness test.
박병선(Byungsun Park),이문용(Munyong Lee),이규현(Gyuhyun Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Resistance spot welding has been widely used in the sheet metal joining processes because of its high productivity and convenience. Recently automobile industries are trying to replace partly aluminum alloy sheets. Among currently produced aluminum alloys, Al alloy sheet of Al-Mg (5000 series) are being tested. Despite the lower fusion temperature of aluminum, more energy is needed for aluminum welding than for welding steel. Delta spot welding machine used process tape. Process tape has many functions. Contaminant sticks to the tape, not to the electrode protection from coatings (e.g. anti-corrosion primer) and pick-up of base material (e.g. Al). In this paper, we suggest the lobe curve for Al5182 with 2.0t, 1.6t and 1.4t using delta spot welding machine. The lobe curves which could expressed weldablity. There were three combinations for same sheet which were Al5182 2.0t, 1.6t and 1.4t. The trend of low boundary and high boundary variation of lobe curve were analyzed with a viewpoint of the contact resistance and the heat input.
배민관(Mingwan Bae),이문용(Munyong Lee),구도회(Dohoi Koo) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In general, the role of the low-speed vehicle bumper is to absorb the impact during a collision and protect the vehicle with its occupants. In order to evaluate the efficiency of the bumper, each country must follow some domestic and International low-speed bumper impact standards and specifications to determine damaged regions. But it is only a consultation or confirmation and not actually the regulation of the efficiency of the bumper. Most automobiles evaluate the balance of the development stage of the bumper with the resultant price of completion which should not yield to a many difference. In this paper, we propose to automobiles possible conditions for a impact test of the low-speed vehicle bumper with great value results.
김래형(Raehyeong Kim),이문용(Munyong Lee),이규현(Gyuhyun Lee),김동욱(Dongok Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Magnesium alloy is currently expected to be widely used for high lightweight and high efficient materials in the automobile and electronics industry. Although Magnesium is excellent materials, it can’t be formed in the room temperature due to HCP structure. However in order to improve the magnesium formability, it is required by the investigation of forming at warm temperature range. This study aims to confirm characteristic of formability of AZ31 magnesium alloy sheet by the warm tensile test and microstructure analysis. The formability of AZ31 magnesium was evaluated at various temperatures, strain rate, strain rate sensitivity and thickness. Furthermore the result of microstructure of AZ31 magnesium shows how grain growth is changed by thickness.
박병준(Byungjoon Park),이문용(Munyong Lee),이규현(Gyuhyun Lee),조해용(Haeyong Cho) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The use of light-weight material as aluminum has been being demanded gradually because the weight lightening of vehicles is excellent in fuel efficiency improvement and the driving performance improvement. In advanced automobile company overseas, Self Piercing Rivet technology that applies to the aluminum and Dissimilar materials, but there are little application cases in domestic market that are only rely on overseas technology skills. Therefore, I optimized design and made Prototype by Self Piercing Rivet technology with FEM Analysis through this research and verified the possibility of mass production for the Confidence Verification of Self Piercing Rivet technology by Strength and Fatigue Life and Corrosion Evaluation.