• 동력기계공학회지
• /
• 제15권6호
• /
• pp.53-58
• /
• 2011

To optimization of mlod for fineblanking forming of sector gear of recliner, it was analyzed the effect of clearance, V-ring height, V-ring position, blank holding force and counter punch force. In case of 0.003 mm of clearancs, the finest shear plane was obtained, but optimization between die and punch clearance was 0.005 mm. The height of V-ring was 0.7 mm. In case of increasing of hold force, the size of shear plane got better and the decrement of thickness became smaller. Both the size of shear plane and the decrement of thickness increased according to increasing of counter punch force.

• 한국기계가공학회지
• /
• 제9권1호
• /
• pp.99-105
• /
• 2010

This study was performed to solve the breaking problem in the fine blanking(FB) process of sector gears for car seat recliner using nickel chrome molybdenum steel(SNCM220) plate. The optimal design of embossing circle is changed to oval with labors' experiences and finite element analysis. The maximum principal stress and effective strain in a forming process are analyzed by commercial finite element software to solve the problems in embossing stage of FB process. As a result of FE analysis, the maximum principal stress in forming is lower than yield point of material. It is shown from experiments in the modified die that the formed gear does not break in embossing stage.

• 한국소성가공학회:학술대회논문집
• /
• 한국소성가공학회 2002년도 금형가공 심포지엄
• /
• pp.308-315
• /
• 2002

In recent automotive industries, fine blanking technology widely used in production of components with relatively thick gauges in brake systems, seat recliner, door locks, and auto transmission systems. Due to its advantages to obtain almost final product quality using fine blanking forming process without additional finish machining processes, consequently saving the production costs. In this paper we intended to develope the small sized module gear toothed dual seat recliner sector gear(0.5mm module) for car seats using fine blanking process which needed semi piercing with computer simulation and a lot of try and errors to achieve required accuracy and geometric quality. However through the some corrections of tool geometries with tryout test, we could get successful results.

• 한국산학기술학회논문지
• /
• 제8권1호
• /
• pp.18-24
• /
• 2007

진동원을 포함하고 있는 제품이 불량품일 경우 비정상 소음진동이 발생하게 된다. 최근 자동차 부품업계 등에서 생산되는 제품의 진동소음 관련 품질을 판별하는데 있어 주로 사람의 청각을 사용하여 판별하는 소음감각 판정방법을 개선하여 제품의 진동신호를 계측 및 분석하여 판별하는 시스템의 도입이 시도되고 있다. 이러한 추세에 따라 Window Regulator Module에 대한 판별과정에 자동화된 품질 판단시스템의 필요성이 대두되고 있다. 이를 위해 LabVIEW를 이용한 진동모니터링 프로그램을 개발하였으며, 가속도계를 이용하여 Sector gear 이음부분의 진동신호를 계측 및 분석하여 모니터링 하였다. 양품과 불량품의 진동신호 특성을 분석하여 모니터링 함으로써 보다 정확하게 양품여부를 판명할 수 있게 되었다.

• 대한기계학회논문집A
• /
• 제34권11호
• /
• pp.1623-1630
• /
• 2010

본 연구에서는 자동차용 시트 리클라이너의 주요 부품인 섹터투스 결합부의 롤오버 저감을 위한 효과적인 성형 방법을 제시하였다. 기존의 성형 공정에 의하여 발생한 과도한 롤오버 때문에 섹터투스 내측기어와 결합 부품인 폴투스 외측기어 간의 정확한 결합이 이루어지지 않아 승차감 및 안전성이 저하된다. 따라서 성형 시, 소재를 롤오버 측으로 유동시켜 롤오버량을 최소화 해야 하며, 이를 위하여 국부 돌기형 다이, 코이닝 펀치를 이용한 방법 및 가변 역클리어런스를 통한 롤오버 저감 방법에 대해 유한요소해석으로 비교 평가 하였고, 이를 검증하기 위해 금형 제작 및 실험을 수행하였다. 실험 결과, 가변 역클리어런스를 이용한 방법이 롤오버 저감 및 금형 강도 측면에서 우수한 특성을 가지는 것을 확인할 수 있었다.

• 한국기계가공학회지
• /
• 제20권12호
• /
• pp.44-53
• /
• 2021

As environmental issues have emerged worldwide, emission gas regulations have been strengthened. In the construction machinery sector, studies have been actively conducted to utilize the power source of electric motors owing to the increasing demand for zero emissions. In this study, the gear specifications of an electric axle for construction machinery were selected by considering the specifications of the motor, gear tooth contact pattern, and face load factor. The gear strength evaluation was performed at the system level using the simulation model. The bending and contact strength of the spiral bevel gears and the bending strength of the planetary gear set showed a safety factor of 1 or more. However, the contact strength of the planetary gear set showed a safety factor of 0.92. Conservative results were derived by performing the analysis under the rated load condition of the motor. However, the ratio of the equivalent torque to the rated torque of the motor was 45% or less, hence, it was determined that no difficulties should arise regarding the durability of the axle.

• 수산해양교육연구
• /
• 제12권1호
• /
• pp.11-21
• /
• 2000

연구해역의 인공어초의 시설상태는 전반적으로 양호한 편이나 부분적으로 하단 부분이 약간 매몰되었고, 조류에 의해 약간 해저가 패여 있었다. 극히 일부를 제외하고는 대부분 어초로서의 기능을 유지하고 있다고 판단되었다. 1. 조사해역에서 20종의 어류가 어획되었고, 잠수조사 관찰종은 10종이었다. 2. 부착생물로서는 수산식물 5종과 수산동물 5종이 관찰되었다. 3. 단위 노력당 어획량은 시설구와 비교구를 비교하면 통발 2.12 : 1.41, 연승 10.23 : 5.43. 삼중자망 4.93 : 2.86를 보였다. 4. 어구별 종조성은 시설구와 비교구를 비교하면 통발 94 : 58, 연승 85 : 37, 삼중자망 118 : 62를 보였다. 따라서 전반적으로 인공어초 시설구에서 비교구 보다 약 2 배의 어획효과가 높았다.

• 수산경영론집
• /
• 제54권4호
• /
• pp.1-18
• /
• 2023

This study examines the significance and problems of the Fourth Amendment to the Fisheries Act, which went into effect in January 2023. Following the passage of the Aquaculture Industry Development Act, the fourth amendment to the Fisheries Act sought to reform the fisheries legislative framework, while also including significant changes. In particular, a number of new systems for managing fishing gear have been implemented, and local governments now have some autonomy in fisheries management, which has allowed for adjustments to be made to meet the needs of the fishing industry and changes in socioeconomic situations. However, as independent legislation for each fisheries sector continues, the subject of regulation under the Fisheries Act, as well as the Act's position as a basic legal system, has been continuously reduced, overshadowing the Act's objective. As a result, a full-fledged assessment of changing the legislation's name in the future is required, as well as addressing issues such as the lack of difference in the legislative purpose clause and the necessity for further revision of the definition clause. Therefore, any future revisions to the Fisheries Act should aim to overhaul the existing framework, including fishing licenses and permits.

• 한국수산과학회지
• /
• 제56권3호
• /
• pp.341-346
• /
• 2023

This study aimed to suggest an alternative income generation (AIG) for local artisanal fisheries communities in the southern coastal area of Bangladesh, which is vulnerable to climate change. To analyze the problems of local artisanal fisheries caused by climate change, field surveys and in-depth interviews with fishermen and government officials were conducted. Livelihood risk factor (LRF) in the marine fishing sector included reduction of fishing days and fish production and damage to fishing vessels and fishing gear due to cyclone and sea-level rise. LRF in the aquaculture sector included cultured fish escape, reduction of aquaculture production, and water pollution due to Monsoon flood. A common challenge for two sectors was high interest rate on commercial loans. Small-scale tank aquaculture is recommended as AIG for securing income of artisanal fisheries communities. In the early stages of dissemination of small-scale tank aquaculture technology, it is necessary to prevent fishermen from struggling to repay high-interest rate loans through technology transfer and facility support by official development assistance. The aquaculture training center, along with the technical education, will also contribute toward expansion of local distribution network and marketing support to establish a value chain for local artisanal fisheries communities.

• 대한디지털의료영상학회논문지
• /
• 제12권1호
• /
• pp.9-14
• /
• 2010

Based on the cardiac PACS application collected from three university hospitals across the country, this research showed us a composition method of a server and storage devices with conditions in the field. Also, we founded the practical use of software making the best of cardiovascular PACS features. In addition, it also examined the components and requirements of the key functions that are available in the cardiovascular sector. We will be investigated the design experience and applications on stable storage and transmission of large video clip data, cardiovascular analysis, and gear interlocks through the study.