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PA 계열 Plastic Gear 내구 성능 예측을 위한 대용 특성 개발
박호성(Hoseong Park),하동헌(Dongheon Ha),정경(Kyung Jeong) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Integrated Dynamic Brake (IDB) is the brake system combined with the electric brake booster and ABS/ESC instead of the existing hydraulic master booster. To embody the compacted packing of the system, we applied this system to the method of motor reducer. The part of the warm wheel in the reducer was used as plastic. Plastic gear has been developed in many industries including car parts to decrease sound, light weight, and the cost. There are many ways to have optimal development for plastic gear which is especially important for durability and sound. It is the proper way to conduct the mechanical endurance test under same condition of the construction material with original system. But disadvantages are time consuming and high costs. This study was conducted to develop the plastic gear and to select suitable material to improve shortcomings of the previous system by applying the IDB system with the worm wheel developed by this company.
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내충격제 첨가에 따른 PPA 복합재료의 내충격 특성에 관한 연구
남궁지현(Jihyun Namkoong),하동헌(Dongheon Ha) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
To improve the competitiveness of PolyPhthalAmide glass fiber reinforced composite in engineering resin applications, it needs dimensional stability, stiffness, strength and impact resistance. In this study, impact modified PolyPhthalAmide blends were prepared by compounding PolyPhthalAmide with EPDM and SEBS-g-MAH. High impact strength can be achieved from SEBS-g-MAH compounding group. We confirmed that properties using application for EWGA gear. From the results of mechanical and tribologycal properties of the blends, SEBS-g-MAH acted as an impact modifier to increase the impact strength of the PolyPhthalAmide glass fiber reinforced composite. While EPDM acted as a wear-resistant modifier to decrease the friction coefficient and wear loss of the PolyPhthalAmide glass fiber reinforced composite.
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Polyolefin Blend에 따른 PPS복합재료의 Worm Wheel용 소재개발
박호성(Hoseong Park),하동헌(Dongheon Ha),김성수(Seongsoo Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Though C-EPS has already been applied in compact cars and it’s expanding to midsize cars, development of stiffness, wear resistance, and dimensional stability of the warm-wheel which made up of plastic is getting essential depending on the increase of motor’s output. For a material of warm-wheel, plastic is mostly using because of its outstanding noise control characteristics. As applied materials, PA66, PA6 and PPS are mainly using. PPS gets less expands when it is expose to an atmosphere of moisture and has advantages of heat resistance, stiffness, wear resistance. However, it has weakness of bad impact resistance, so it’s brittle. To overcome the limitations of PPS, we have tried to make a superior PPS for warm-wheel which has same ability of wear resistance, dimensional stability with existing PPS and has magnificently developed in the property of impact resistance through polyolefin blending. By blending three materials (EBA(Ethylene-butyl acrylate), EMMA(Ethylene Methacrylic Methyl Acid), GMA(Glycidyl Methacrylate) affiliated with polyolefin to PPS, we focused on the improvement in toughness according to the betterment of impact resistance and elongation. Also we tried to find Miscibility relationship between materials affiliated with polyolefin and PPS and the blending rate that we can obtain the best properties.
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자동차용 Shock Absorber의 경량화를 위한 Plastic Rod Guide 개발
박호성(Hoseong Park),하동헌(Dongheon Ha),김성수(Seongsoo Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The Rod Guide controls automobile’s behavior and it is one of the components of the Shock Absorber which implements the stability of adjustment and the comfortable riding quality by absorbing impact and vibration energy. The Rod Guide conducts functions of oil sealing, Rod-support and Sliding. The development of changing material from sinteried material to plastic is recently done to reduce weight and cost. However strength, lubricity, resistance to abrasion, dimensional stability, thermal resistance of material has to be maintained even material changes to plastics. This study is about developing an alternative material that can be applied to body and Du-Bush part with plastic resin such as PPA, PAA, PPS, POM, PEEK, PA12, PA66 for the effective material change. We evaluated properties as making test-specimens of each materials, and applied the most superior material to the component. We tried to find the optimum injection methods and shape which can maximize characteristics of materials, and raise applicability through durability test of assembly.
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카본섬유를 적용한 고분자복합소재로 제조한 조향 장치 부품 경량화에 대한 연구
박태원(Taewon Park),하동헌(DongHeon Ha) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Worldwide, the lightweight car parts for environment-friendly and fuel economy improvement for product development is accelerating. Existing polymers in this study by the addition of Glass Fiber stiffness secure, but in the lighter parts of steering system, replacing it by the addition of carbon composite material Carbon fiber was also investigated. PA66 Carbon Fiber material and applied in thermoplastic injection, Carbon Fiber Reinforced Plastic (CFRP) materials developed by the thermosetting compression to the existing metal steering system parts replaced were applied. Optimize the design of the components and material evaluation, progress and interpreted in accordance with the lightweight, basic physical properties were obtained. Ass"y for the final assembled so developed parts were evaluated for performance and durability. Evaluation results of existing Steel compared to the 70% level, and by 30 to 50 percent lighter effect parts, and achieve the level of physical properties, components and Ass"y strength, performance, and room temperature for the duration of the goals were satisfied. Endurance limit in the future, and to propel the vehicle test plans to conduct additional verification.
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