• Title/Summary/Keyword: Auto industry

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Nugget Formation and Dynamic Resistance in Resistance Spot Welding of Aluminum to Steel

  • Chang H. S.
    • International Journal of Korean Welding Society
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    • v.5 no.1
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    • pp.53-59
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    • 2005
  • Auto industry has employed resistance spot welding(RSW) to join steel sheets for structural rigidity of automobile body. Driven by the need to reduce weight and fuel consumption, car companies have been evaluating aluminum intensive vehicles(AIVs) as a way to reduce vehicle weight without downsizing. During the transition from all steel-construction vehicle body to aluminum intensive body, joining aluminum to steel sheets emerges as a serious contender in automobile body. This paper deals with application of transition material to RSW aluminum to steel. Placing transition material insert between the aluminum/steel interface was found very effective to overcome physical incompatibility between aluminum and steel. Use of transition insert allows for two separate weld nuggets to be formed in their respective aluminum/aluminum and steel/steel interfaces. This RSW processes was monitored with the aid of dynamic resistance sampling. Typical patterns in sampled dynamic resistance curves indicated formation of sound nugget. The growth of two separate nuggets was examined by micro-cross section test.

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A Study on the Automatic Design of Dies for Hot Extrusion of Aluminium Alloys (알루미늄 합금 형재의 열간압출 금형 설계 자동화에 관한 연구)

  • 이춘만;송인성;정원지
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.1
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    • pp.135-143
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    • 2003
  • This study presents development of a automatic design software for process and die design of hot extrusion of aluminium alloys through square dies. The design of extrusion dies is still an art rather than a science with increasing complexity of shape and thinness of section. Therefore, most of the die design is still dependent on personal judgement, intuition and experience. The objective of this study is to develop a software system which includes a design rule extracted from literatures and experts in the extrusion industry. The developed system is effectively used to design extrusion processes and dies with reduced lead time and trial extrusion.

Decision Issues on Part Supply in Build-to-Order Manufacturing Systems (주문생산방식 제조시스템에서 부품공급에 관한 의사결정 이슈)

  • Choi, Ki-Seok
    • Journal of Korean Institute of Industrial Engineers
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    • v.39 no.1
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    • pp.78-81
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    • 2013
  • In Build-to-Order manufacturing systems, products are usually manufactured by a pull system. The manufacturers order only what they need when it is needed. The suppliers are expected to deliver parts as much as needed. When the part demand fluctuates significantly, this places lots of challenges on the suppliers. In this letter, we explore the decision issues regarding part supplies for Build-to-Order manufacturing systems, especially in the auto industry, and suggest how to address them in order to make the manufacturing systems work more efficiently.

A study on the Interlock Circuit Abnormality of High Voltage System in HEV (하이브리드자동차 고전압 시스템 인터록 회로 이상 시 미치는 영향에 관한 연구)

  • Song, Rak Hyun;Cho, Haeng Muk
    • Journal of Energy Engineering
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    • v.24 no.3
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    • pp.27-33
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    • 2015
  • Recently, global warming has been accelerated due to air pollution and air pollutants are coming from the exhaust of the ICE vehicles, which are gradually increasing in number globally. That is why all the countries in the world are striving to reduce pollutant emissions of automobiles by strengthening regulations on air pollution. To comply with the regulations, the auto industry came up with hybrid vehicles, which have features of both ICE vehicles and electric vehicles. Hybrid vehicles show improvements in emissions, fuel efficiency, as well as functions as electric vehicles. This study aims to show possible troubles that occur at times of damages in high-voltage systems, and to suggest responsive measures.

Development of Automated Demand Response Platform Using Open Source Code (오픈소스를 활용한 지능형 수요반응 플랫폼 개발)

  • Yoon, Jae-Weon;Lee, Ingyu;Choi, Jung-In
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.8
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    • pp.1116-1120
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    • 2014
  • With the shift of the energy paradigm from supply side management to demand side management, demand resource management and demand response plays an important role in the energy industry. As a consequency, a lot of researches have been done to provide a suitable demand response system. However, most of the demand response systems are based on the propriety products that cannot be modified. In this paper, we are proposing an automated demand response system using an EnerNOC provided open source code. We implemented the demand response server (VTN) and demand response client (VEN), and validated the OpenADR2.0 compliances using the open source code. We also used an Arduino microcontoller to demonstrate the communication schemes to control various devices.

포.토.클.리.닉 - 왕초보를 위한 사진 촬영 기초강좌(1) - 카메라 기능 제대로 알아야 사진과 친해진다

  • Yun, Jeong-In
    • The Optical Journal
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    • s.120
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    • pp.82-87
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    • 2009
  • 사진의 디지털화와 대중화라는 말이 새삼스럽게 느껴지지 않을 만큼 사진은 너무도 친숙한 일상이 되었다. 똑딱이(콤팩트 디지털카메라) 카메라뿐만 아니라 전문가의 전유물로만 여겨졌던 DSLR(렌즈교환식 디지털카메라)의 보급률도 급속하게 높아지고 있다. 그러나 필자의 경험을 비추어보건데 카메라의 기능을 제대로 이해하고 정확하게 사용할 줄 아는 이들이 많지 않을 것이라 추측된다. 필자 역시 사진에 대해 깊이 몰랐을 적에는 항상 '자동(AUTO)모드'로만 촬영을 했다. 이후 자치구 문화원에서 사진에 관한 평생학습과정을 수료하고 사진동아리 활동과 함께 일주일에 한번정도 계속적으로 촬영에 나서면서 사진에 대한 지식과 경험을 쌓게 되었다. 사진학과도 나오지 않은 필자가 초보자를 위한 촬영 가이드를 요청받았을때 부끄럽기도 했으나 '과부 심정 홀아비가 안다'는 속담처럼 사진을 배우는 입장에서 다른 초보자들도 필자와 같은 궁금증이 있을 것이라 생각하여 용기를 내어 필자가 촬영현장에서 느꼈던 경험들을 쉽게 풀어 설명하고자 한다. 사진에 대해 알아가면 갈수록 사진은 빛으로 쓰는 언어라고 감히 정의를 내려본다. 이번호부터 필자와 함께 빛을 찍는 사진의 세계를 같이 탐구해 보도록 하자.

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A Study on the Electromagnetic Shielding Characteristics of Crash Pad Using Electrically Conductive Powders and Al-coated Glass Fiber as Filler in Automotive (전기전도성 분말과 알루미늄 코팅 유리섬유를 사용한 자동차용 크래쉬패드의 전자파 차폐 특성에 관한 연구)

  • Cho, Hong;Jeoung, Sun-Kyoung;Kim, Byeong-Woo
    • Journal of Powder Materials
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    • v.21 no.2
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    • pp.124-130
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    • 2014
  • The automotive industry is moving from the internal combustion engine to electric drive motors. Electric motors uses a high voltage system requiring the development of resources and components to shield the system. Therefore, in this study, we analyze electromagnetic interference (EMI) shielding effectiveness (SE) characteristics of an auto crash pad according to the ratio of electrically conductive materials and propylene. In order to combine good mechanical characteristics and electromagnetic shielding of the automotive crash pad, metal-coated glass fiber (MGF) manufacturing methods are introduced and compared with powder-type methods. Through this study, among MGF methods, we suggest that the chopping method is the most effective shielding method.

Pattern Recognition of Dynamic Resistance and Real Time Quality Estimation (동저항 패턴 인식 및 실시간 품질 평가)

  • 조용준;이세헌
    • Proceedings of the KWS Conference
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    • 2000.04a
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    • pp.303-306
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    • 2000
  • Quality estimation of the weld has been one of the important issues in RSW which is a main process of the sheep metal fabrication in auto-body industry, It was well known that among the various welding process variables, dynamic resistance has a close relation with nugget formation. With this variable, it is possible to estimate the weld quality in real time. In this study, a new quality estimation algorithm is developed with the primary dynamic resistance measured at welding machine timer. For this, feature recognition method of Hopfield neural network is used. Primary resistance patterns are vectorized and classified with five patterns. The network trained by these patterns recognizes the dynamic resistance pattern and estimates the weld quality Because the process variable monitored at the primary circuit is used, it is possible to apply this system to real time application without any consideration of electrode wear or shunt effect.

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Process Design of Monobloc Tube for Steering Input Shaft in Cold Drawing (일체형 스티어링 휠 튜브의 인발에 관한 연구)

  • Lee S. K.;Moon H. S.;Kim B. M.;Lee J. H.;Lee Y. S.
    • Transactions of Materials Processing
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    • v.14 no.9 s.81
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    • pp.779-784
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    • 2005
  • MTS(Monobloc Tube Shaft) has been used for the reduction in weight of shaft and increase in supply of power in the auto industry nowadays. Cold drawing process having high productivity and reduction in the cost has been regarded as the effective technology that is able to substitute for swaging process as forming MTS with constant outer diameter or hollow shaft without surface defects. The objective of this study is not only to (md out the optimal process conditions understanding the effect of process parameters on carrying out cold drawing process of SIS(Steering Input Shaft) but also to control the defects resulted from inappropriate process conditions. Therefore, the proper drawing conditions are presented using FE-Analysis and experiment in the paper.

Development Can Air Leak Detector System For Single Compression Head-Line Type Using Pressure Sensor (압력 센서를 이용한 씽글 헤드라인 타입의 캔 에어 리크 검출씨스템 개발)

  • Lee, Jong-Woon
    • Proceedings of the KIEE Conference
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    • 1992.07a
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    • pp.506-507
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    • 1992
  • When it comes to the 'Leak Detector System' generally, our country has a large income 'Rotary Type Leak Detector' of foreign goods. The completed development of the 'Line Type Leak-Detector' system was produced to check Whether the containers for small and large on the filling line are auto defective. This system is applied to the filling package Processing during the production and contributed to inproving competiveness of domestic containers manufactures of all society of Industry. Also, high precision and realiablity, very compact size, low cost and Easy set-up etc. by checking the experimental data directly plan, Design and making for '1 Compression Head Control Leak Detector System'. This flexcible system can be equipped with multiple Compression heads depending on the requested prodution test rate and test precision.

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