• Title/Summary/Keyword: Standard Parts

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The study on the interpretation for the usage of standard parts for civil aircraft certification (민간 항공기 인증을 위한 표준부품 적용에 대한 고찰)

  • Park, Guen-Youn;Kim, Il-Youn;Lee, Jong-Hee
    • Journal of Aerospace System Engineering
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    • v.6 no.2
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    • pp.18-22
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    • 2012
  • This is the study to introduce the interpretation and application of standard parts for civil aviation. The standard parts is considered one of replacement and modification parts acceptable to the civil aviation authority.

An e-Catalog to Support e-Machining of ETO Mold Parts (주문형 금형 부품의 디지털 제조를 지원하는 전자 카달로그)

  • Mun D.H.;Cho J.M.;Kim B.C.;Jang K.S.;Han S.H.;Ryu B.W.
    • Korean Journal of Computational Design and Engineering
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    • v.10 no.3
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    • pp.188-198
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    • 2005
  • There are two types of mold parts, ready-made standard parts and ETO (Engineered-to-Order) parts, the latter are of increasing importance to manufacturers. However, the ETO parts require more engineering support and communication than the ready-made standard parts. Existing e-Catalog modules provide classification structures of products that allow customers to select products based on their needs, and the trade begins with the provided specification. However, machine parts or mold parts have different purchasing patterns. Customers do not purchase the ready-made standard parts offered by an e-Catalog. They usually (1) add own options to the provided specifications or (2) change specification items such as length. To support these trades, a new e-Catalog system is proposed. The proposed system is based on the product design process and the specification selection process in addition to the parts classification structure.

A Study on the Performance Characteristics and Reuse Effect for Recycled Parts of CV Joint and Steering Gear Box in the Vehicles (자동차 중고재생 등속조인트와 스티어링 기어박스의 성능과 활용효과에 대한 연구)

  • 조휘창;박인송
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.5
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    • pp.199-205
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    • 2002
  • The scale of repair parts market reached 0.1 billion won. Above all, it is remarkable that the automotive insurance business world is paying f3r 40 ~5o% of the whole repair cost. The repair parts consist of a genuine parts, non-genuine parts, recycling used parts. It is the recent trend that recycled parts are more popular than the genuine parts f3r repairing crashed cars due to the cost. Performance of recycled continuous velocity(CV) joints and power steering(PS) gear box as replacement parts was tested and analysed in this study. To examine the durability of the recycled parts, the replaced CV joints and PS gear box after repair were tested and analysed periodically. The results were showed that basic performance of the recycled parts was normal. However the ball cage of CV joints was more frequently damaged than genuine parts. We concluded that a test standard and amendment of related laws for recycled parts is required to get a safe and durable parts.

Development of a 3D CAD Program for Standard Parts and Mold Base of Injection Mold Using Pro/ENGINEER (Pro/ENGINEER를 이용한 사출금형의 표준부품 및 몰드베이스 자동생성 3D CAD 프로그램 개발)

  • Pack, Pil-Ju;Kim, Kwan-Woo;Kim, Jong-Won;Han, Ki-Beom;Lee, Hyeon-Chul;Cho, Hae-Yong
    • Journal of Advanced Marine Engineering and Technology
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    • v.33 no.2
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    • pp.304-312
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    • 2009
  • Automated design system of injection mold was developed in this study. Shapes of mold parts and mold base were defined according to standards of mold components and database modules of mold components were built. And then an automation program of mold design was developed by the user definition features, family table and Pro/Program of Pro/Engineer. The automatic production divided into mold base and standard parts was manipulated to manufacture parts meeting the design requirements and the selected parts were changed in size and shape to meet the design goals. The mold design was also carried out to have organic relations and be easy in case of a change to the mold part or mold base. As a result, it is possible to design the mold efficiently and conveniently modify the designed mold parts and base by using the developed automated design system in this study.

Study on the grading standard of Panax notoginseng seedlings

  • Chen, Lijuan;Yang, Ye;Ge, Jin;Cui, Xiuming;Xiong, Yin
    • Journal of Ginseng Research
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    • v.42 no.2
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    • pp.208-217
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    • 2018
  • Background: The quality differences in seedlings of medicinal herbs often affect the quality of medicinal parts. The establishment of the grading standard of Panax notoginseng seedlings is significant for the stable quality of medicinal parts of P. notoginseng. Methods: To establish the grading standard of P. notoginseng seedlings, a total of 36,000 P. notoginseng seedlings were collected from 30 producing areas, of which the fresh weight, root length, root diameter, bud length, bud diameter, and rootlet number were measured. The K-means clustering method was applied to grade seedlings and establish the grading standard. Results: The fresh weight and rootlet number of P. notoginseng seedlings were determined as the final indices of grading. P. notoginseng seedlings from different regions of Yunnan could be preliminarily classified into four grades: the special grade, the premium grade, the standard grade, and culled seedlings. Conclusion: The grading standard was proven to be reasonable according to the agronomic characters, emergence rate, and photosynthetic efficiency of seedlings after transplantation, and the yields and contents of active constituents of the medicinal parts from different grades of seedlings.

Determining Standard Times of Assembly Products using A Modified BOM (수정 BOM 을 이용한 조립제품의 표준시간 산출)

  • Um, Kwang-Yong;Lee, Moon-Kyu
    • IE interfaces
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    • v.11 no.3
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    • pp.103-114
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    • 1998
  • This paper suggests a computer software system which generates standard times for assembly products. The system called "computer aided logical system for standard times(CALS4ST)" incorporates a modified bill of materials, BOM4ST(BOM for standard time) to deal with auxiliary operations which are not directly related to parts and assemblies listed in the standard BOM. Typical examples of the operations include inspection, adjustment, and repairing works to be done before or after assembly operations. Once standard time data bases for both the part assembly operations and the auxiliary operations are set up, the system relates the BOM4ST to the standard time data bases so as to calculate the standard time for a assembly part concerned. According to the structure of parts and auxiliary operations in the BOM4ST, their standard times stored in the data bases are to be sequentially added up considering the specified assembly-operation characteristics. To illustrate the feasibility of the system, the case study of L company is provided.

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A Study on the Cleaning Efficiency Valuation of Alternatives Cleaning Agent for Trichloroethane & Trichlorotrifluoroethane (Trichloroethane과 Trichlorotrifluoroethane의 대체세정제에 대한 세정력 평가에 관한 연구)

  • Lee, Seok-Woo
    • Journal of the Korean Applied Science and Technology
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    • v.13 no.3
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    • pp.111-117
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    • 1996
  • Many alternatives to Trichlorothane & Trichlorotrifluoroethane mainly used as cleaning solvent for industrial parts are developed and commercialized because the solvent is scheduled to phaseout after 1996. Considering there are many kinds of parts and contaminants in all parts cleaning, It is essential to investigating the characteristics and performance of the alternatives prior to use. For the contaminant of a standard oil, waters, hydrocarbon and halogen parts which are the comercially available and promising alternatives were experimented at the same condition of Trichlorothane & Trichlorotrifluoroethane to check the cleaning performance. Overally, the removal efficiency of halogen solvent parts was better than that of hydrocarbon or waters parts for removing the standard oil used in this experiment.

The Change of Inspection&Replacement Period for ROKAF's Operating Aircraft Parts (한국공군 운영 항공기 부품 검사/교환주기 변경 - 예방정비 대책 품질개선의 일환으로 -)

  • Kwo Seung-Chul
    • Journal of the military operations research society of Korea
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    • v.30 no.2
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    • pp.108-121
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    • 2004
  • This paper deals with a procedure of changing the current inspection & replacement periods for ROKAF aircraft parts. ROKAF is mostly operating aircraft of foreign makes, and takes maintenance actions according to Technical Orders(TO.) published by foreign aircraft manufacturers. Therefore ROKAF inspects and replaces specific parts at the time noticed from T.O.. These inspection and replacement periods are determined by manufacturers according to the standard operating environment and parts' durability. But the standard operating environment Is different from operator's environment. Because of this difference, the inspection and replacement periods have to be changed according to operators' operation environment. It is resonable that the manufacturer, having design materials and life test data of parts, changes those periods together with materials of operators' operation environment. But we have many difficulties in obtaining the design materials and life test data. Then this paper proposes a procedure of changing the periods of aircraft's parts with life data obtained during operating aircraft. For the reliability analysis, a software of RELEST (Reliability Estimation Version 1.0) is used.

A Study on the Standard of CAD Drawing in the Water Resources Parts to Support Construction CALS/EC (건설CALS/EC 지원을 위한 수자원 분야 전자도면 표준체계에 관한 연구)

  • Kang, Young Mi;Kang, Joon Mook
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.28 no.4D
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    • pp.553-560
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    • 2008
  • As it was developed to korea standard of the CAD Drawing in Construction CALS/EC for the productivity Improvement in Construction Industry and efficiency rising of construction management. it is high time to design the standard system in water resources. The purpose of this study is to establish the strategies for standard system of drawing information in water Resources parts for construction CALS/EC. This study is to analyse the existing construction drawing standards including CMS, CMMS, drawing guideline of a water Resources public institution, ISO, US National CAD Standard, Japanese Standard. As a result of the analysis, this study proposes the prime structure of the water Resources drawing information standard to support construction CALS/EC. For the establishment of standard system in real practice, this study establishes the numbering system to joint the current standard system for a water Resources order institution and to keep construction CALS/EC. In conclusion, the standard system of drawing information is proposed as a fundamental frame to water Resources parts of construction CALS/EC.