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High Power Diode Laser을 이용한 금형재료용 구상화 주철의 모서리부 표면처리
황현태,송현수,김종도,송무근,김영국,Hwang, Hyun-Tae,Song, Hyeon-Soo,Kim, Jung-Do,Song, Moo-Keun,Kim, Young-Kuk 한국재료학회 2009 한국재료학회지 Vol.19 No.9
Recently, metal molding has become essential not only for automobile parts, but also mass production, and has greatly influenced production costs as well as the quality of products. Its surface has been treated by carburizing, nitriding and induction hardening, but these existing treatments cause considerable deformation and increase the expense of postprocessing after treatment; furthermore, these treatments cannot be easily applied to parts that requiring the hardening of only a certain section. This is because the treatment cannot heat the material homogeneously, nor can it heat all of it. Laser surface treatment was developed to overcome these disadvantages, and, when the laser beam is irradiated on the surface and laser speed is appropriate, the laser focal position is rapidly heated and the thermal energy of surface penetrates the material after irradiation, finally imbuing it with a new mechanical characteristic by the process of self-quenching. This research estimates the material characteristic after efficient and functional surface treatment using HPDL, which is more efficient than the existing CW Nd:YAG laser heat source. To estimate this, microstructural changes and hardness characteristics of three parts (the surface treatment part, heat affect zone, and parental material) are observed with the change of laser beam speed and surface temperature. Moreover, the depth of the hardened area is observed with the change of the laser beam speed and temperature.
황현태,소상우,김종도,Hwang, Hyun-Tae,So, Sang-Woo,Kim, Jong-Do 한국재료학회 2011 한국재료학회지 Vol.21 No.7
Currently, there are two main issues regarding the development of core technologies in the automotive industry: the development of environmentally friendly vehicles and securing a high level of safety in the event of an accident. As part of the efforts to address these issues, research into alternative materials and new car body manufacturing and assembly technologies is necessary, and this has been carried out mainly by the automotive industries. Large press molds for producing car body parts are made of cast iron. With the increase of automobile production and various changes of design, the press forming process of car body parts has become more difficult. In the case of large press molds, high hardness and abrasive resistance are needed. To overcome these problems, we attempted to develop a combined heat treatment process consisting of local laser heat treatment followed by plasma nitriding, and evaluated the characteristics of the proposed heat treatment method. From the results of the experiments, it has been shown that the maximum surface hardness is 864 Hv by the laser heat treatment, 953 Hv by the plasma nitriding, and 1,094 Hv by the combined heat treatment. It is anticipated that the suggested combined heat treatment can be used to evaluate the durability of press mold.
황현태 ( Hyun Tae Hwang ),소상우 ( Sang Woo So ),김종도 ( Jong Do Kim ) 한국열처리공학회 2011 熱處理工學會誌 Vol.24 No.4
Recently, from general machine parts and automobile parts using carbon steel to a mold, there has been efforts for improving durability and attrition resistance of these parts. Especially, heat treatment with laser which works fast and automatically can be used for the mass production with high quality. Moreover, local heat treatment can be used to handle with complex and precise parts. Accordingly, we analyzed hardening characteristics of carbon steel using the finite element method and compare the experimental results to have more reliability. We also proved the cause of thermal deformation with temperature and stress distribution by heat treatment. After these analysis and experimental, we found that each maximum hardness of the two tests was 728Hv and 700Hv, on condition of 1050℃ heating temperature, and 2mm/sec laser speed. We also found that difference of surface stress-distribution was occurred, and this makes deformation mode up after heat treatment.
기업 내 PLM 적용을 위한 웹 기반 제품 개발 공정 협업 솔루션 개발
황현태(Hyun-Tae Hwang),이수홍(Soo-Hong Lee) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.2
When developing products, several companies save data in the database and use related information during further product development. In this research, a web-based PLM solution which includes optimized user interfaces has been developed in order to apply a concept of PLM to several companies. This solution can guide how to develop products and manage data by using PLM software in a product development process. Especially, the system is constructed to consider compatibility on a mobile environment. Therefore, this system satisfies requirements in a collaborative process since the system is not limited by locality. Flow of the solution was configured for manufacturing process, and limitations of the existing PLM software are modified. For the application of PLM in enterprise and online conference, solution are organized composed with simple user interface and web based mobile-PC system. This system provide web-based conference, cost process, web-based 3D CAD conference, and after-management. Ultimately, this system contains designers, customers and manufacturers.
고출력 다이오드 레이저를 이용한 프레스 전단금형의 경화특성
황현태 ( Hyun Tae Hwang ),소상우 ( Sang Woo So ),황재현 ( Jae Hyun Hwang ),김종도 ( Jong Do Kim ) 한국열처리공학회 2010 熱處理工學會誌 Vol.23 No.5
Recently, metal molding has become essential not only for automobile parts, but also mass production, and has greatly influenced production costs as well as the quality of products. Its surface has been treated by carburizing, nitriding and induction hardening, but these existing treatments cause considerable deformation and increase the expense of postprocessing after treatment; furthermore, these treatments cannot be easily applied to parts that requiring the hardening of only a certain section. This is because the treatment cannot heat the material homogeneously, nor can it heat all of it. Laser surface treatment was developed to overcome these disadvantages, and, when the laser beam is irradiated on the surface and laser speed is appropriate, the laser focal position is rapidly heated and the thermal energy of surface penetrates the material after irradiation, finally imbuing it with a new mechanical characteristic by the process of self-quenching. This research estimates the material characteristic after efficient and functional surface treatment using HPDL, which is more efficient than the existing CW Nd:YAG laser heat source.
사출금형용 고탄소강(HP4MA)의 레이저열처리 특성에 관한 연구
황현태(Hyun-Tae Hwang),최흥원(Hung-Won Choi),김종도(Jong-Do Kim) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.5
Recently, lots of automobile part manufacturers try to increase glass fiber content of their plastic parts to improve strength and impact-resistance. For this reason, injection mold requires high hardness and wear-resistant. Laser surface treatment is used to improve characteristics of wear and to enhance the fatigue resistance for injection mold. In this paper, high carbon steel (HP4MA) for injection mold material was heat-treated to harden surface by using high power diode laser (HPDL). To find the process parameters for laser surface treatment of HP4MA, many experiments are carried out as changing the parameters of surface temperature and travel speed of laser. From the results of the experiments, it has been shown that the maximum average hardness is approximately 711∼739 Hv when the temperature and the travel of laser are 1,050℃ and 2 mm/sec.