• Title/Summary/Keyword: Mechanical parts

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Investigation into the Effects of Process Parameters of DED Process on Deposition and Residual Stress Characteristics for Remanufacturing of Mechanical Parts (기계 부품 재제조를 위한 DED 공정 조건에 따른 적층 및 잔류응력 특성 분석)

  • Kim, D.A.;Lee, K.K.;Ahn, D.G.
    • Transactions of Materials Processing
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    • v.30 no.3
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    • pp.109-118
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    • 2021
  • Recently, there has been an increased interest in the remanufacturing of mechanical parts using metal additive manufacturing processes in regards to resource recycling and carbon neutrality. DED (directed energy deposition) process can create desired metallic shapes on both even and uneven substrate via line-by-line deposition. Hence, DED process is very useful for the repair, retrofit and remanufacturing of mechanical parts with irregular damages. The objective of the current paper is to investigate the effects DED process parameters, including the effects of power and the scan speed of the laser, on deposition and residual stress characteristics for remanufacturing of mechanical parts using experiments and finite element analyses (FEAs). AISI 1045 is used as the substrate material and the feeding powder. The characteristic dimensions of the bead shape and the heat affected zone (HAZ) for different deposition conditions are obtained from the experimental results. Efficiencies of the heat flux model for different deposition conditions are estimated by the comparison of the results of FEAs with those of experiments in terms of the width and the depth of HAZ. In addition, the influence of the process parameters on residual stress distributions in the vicinity of the deposited region is investigated using the results of FEAs. Finally, a suitable deposition condition is predicted in regards to the bead formation and the residual stress.

Statistical Analysis of Mechanical Parts Industry in Chungju Region (충주지역의 기계류 산업동향 통계분석)

  • Lee, Hyoung-wook;Park, Sung-jun
    • Journal of Institute of Convergence Technology
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    • v.2 no.2
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    • pp.55-58
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    • 2012
  • The strategic industry in Chungbuk province is the electric and electronic related industry. In the Chnugju region, the trend of major industry have change from the electric and electronic related industry to mechanical parts and components related industry include manufacturing of automobile and transportation. In this paper, we perform statistical analysis using the micro data service provided by the Statistics Korea, The CAGR of the number of employee and value-added value in the electric and electronic related industry during past 7 years are -7.1% and -13.2%, respectively while the CAGR in the mechanical parts related industry are 14.4% and 22.9%, respectively. However, value-added value per value of shipment of the mechanical related industry is lower than that of the electric and electronic related industry.

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Fusion technology of artifacts considering environmental recycling for sustainability

  • Fujita Toyohisa
    • 한국지구물리탐사학회:학술대회논문집
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    • 2003.11a
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    • pp.563-568
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    • 2003
  • Recently, the recycled amount of electric, mechanical parts, and appliances in artifacts has increased. These products use valuable rare metals such as platinum group metals and gold, which are included occasionally as additives. Rare metals are maldistributed in the world and most of them are produced in small quantities. A small amount of rare metals used in the appliances causes a large loss of rare metal resources because of the lack of an economically recycling method. The present recycling technologies including physical and chemical separation methods that are considered for recycling of electric, mechanical parts and appliances.

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Development of the Vision System to Inspect the Inside of the Brake Calipers (브레이크 캘리퍼 내부 검사를 위한 비전시스템 개발)

  • Kwon, Gyoung Hoon;Chu, Hyung Gon;Kim, Jin Young;Kang, Joonhee
    • Journal of Sensor Science and Technology
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    • v.26 no.1
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    • pp.39-43
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    • 2017
  • Development of vision system as a nondestructive evaluation system can be very useful in screening the defective mechanical parts before they are assembled into the final product. Since the tens of thousands of the mechanical parts are used in an automobile carefully inspecting the quality of the mechanical parts is very important to maximize the performance of the automobile. To sort out the defective mechanical parts before they are assembled, auto parts fabrication companies employ various inspection systems. Nondestructive evaluation systems are getting rapidly popular among various inspection systems. In this study, we have developed a vision system to inspect the inside of the brake caliper, a part that is used to compose a brake which is the most important to the safety of the drivers and the passengers. In a brake caliper, a piston is pushed against the brake disk by oil pressure, causing a friction to damp the rotation of the wheel. Inside the caliper, a groove is positioned to adopt an oil seal to prevent the oil leaks. Inspecting the groove with our vision system, we could examine the existence of the contaminants which are normally the residual tiny pieces from the machining process. We used a high resolution GigE camera, 360 degree lens to look in the inside view of the caliper at once, and a special illumination system in this vision system. We used the edge detection technique to successfully detect the contaminants which were in the form of small metal chips. Labview graphical program was used to process the digital data from the camera and to display the vision and the statistics of the contaminants. We were very successful in detecting the contaminants from the various size calipers. We think we are ready to employ this vision system to the caliper production factories.

The Performance Test on Me-DLC Films for Improving Wear Resistance of LM-Guide (LM 가이드의 내마모성 향상을 위한 Me-DLC 코팅박막의 성능평가)

  • Kang, Eun-Goo;Lee, Dong-Yoon;Kim, Seong-Young
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.4
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    • pp.409-416
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    • 2012
  • Recently, surface modification technology is of importance to improve the wear resistance and the corrosive resistance for high accurate mechanical parts such as LM guide, Ball Screw and Roller Bearing etc., Those has generally featured on rolling contact mechanism to improve not only the wear and the friction, but also the accuracy and the corrosion performances. For surface modifications of high accurate mechanical parts, normally thermal spray, PVD, CVD and E.P. processes have been used with many materials such as DLC, raydent, W, Ni, Ti etc. Diamondlike carbon (DLC) films possess a combination of attractive properties and have been largely employed to modify the tribological behaviors such as friction, wear, corrosion, fretting fatigue, biocompatibility, etc. However, for rolling contact mechanism mechanical parts DLC films are needed to study for commercial benefit. Rolling contact mechanism has features on effects of cyclic motions and stresses, and also not simply sliding motions. The papers focused on the performance test of wear and corrosive resistance according to Me-DLC film thickness. And also, its thickness effect of wear analysis was carried out through the simulation of the maximum shear stress under the rolling contact surface. As the results, Me-DLC films have more potential to improve the wear resistance for high precision mechanical parts than raydent films.

Nondestructive Evaluation Technology and Reliability of Products

  • Lee, Joon-Hyun;Lee, Seung-Suck
    • Proceedings of the Korean Reliability Society Conference
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    • 2001.06a
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    • pp.235-238
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    • 2001
  • It is well known that the reliability of materials of mechanical products is becoming more and more important not only for assurance of quality, but for international competition of products. In order to assure the reliability of materials or mechanical products nondestructive evaluation (NDE) techniques are playing more important roles. The existence of Internal defects in materials or mechanical parts is served as crack initiation site during the various loading condition. Historically, nondestructive evaluation (NDE) technique has been used almost exclusively for detecting microscopic discontinuities In materials or mechanical parts after they have been in service to expand the role of the NDE to include all aspects of materials production and application. Research efforts are being directed at developing and perfecting NDE techniques capable of monitoring (1) materials production processes (2) material integrity following transport, storage and fabrication and (3) the amount and rate of degradation during service. In addition, efforts are underway to develop technique capable of quantitative discontinuity sizing, permitting determination of response using fracture mechanics analysis, as well as techniques for quantitative materials characterization to replace the qualitative techniques used in the past. In this paper, the important role of NDE technology for reliability assurance of materials/mechanical parts is introduced.

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A Study on Measurement of Crack Length by using Laser Speckle Interferometry (레이저 스페클 간섭을 이용한 균열 길이 측정에 관한 연구)

  • Kang, Young-June;Bae, Jin-Kil;Ryu, Weon-Jae;Park, Nan-Kyu
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.5
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    • pp.34-41
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    • 2001
  • More accurate and fast inspection method for mechanical parts and structure is required to guarantee the safety. Conventional methods using compliance method, eddy current method, ultrasonic wave, acoustic emission for non-destructive testing in mechanical parts and structure have been performed as the method of contact with objects to be inspected. With this reason these methods have been taken relatively much time, money, and manpower. In this study, in order to overcome these shortcomings, we used In-plane Electronic Speckle pattern Interferometry(In-plane ESPI) that was full-field measurement and noncontact method. We detected the cracks of the specimen at a real time and measured the length of the crack by using In-place ESPI system. Finally, we compared this results with conventional microscope method.

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A study on the knowledge representation of industrial mechanical elemental parts for boundary representation (산업용 기계요소 부품의 경계표현을 위한 지식표현에 관한 연구)

  • Jeon, Chan-Gu;Ko, Myoung-Sam
    • Proceedings of the KIEE Conference
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    • 1987.11a
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    • pp.325-329
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    • 1987
  • In this paper, attempts have been made to extract elemental knowledges from contours of industrial mechanical elemental parts for efficient boundary representation ( chain coding) of their contours. These elemental knowledges could be used to know-ledge representation for representing boundaries of various industrial mechanical parts. Analysis is focused on elemental knowledges of line and circle boundaries, which compose basic elements of the contours of industrial mechanical parts.

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Development of fundamental technologies on high precision mold for micro functional elements and parts (기능성 초정밀 핵심 요소부품 제조 초정밀 금형 기반기술 개발)

  • Je, T.J.;Lee, E.S.;Choi, D.S.;Kim, J.G.;Whang, K.H.;Yoon, J.S.;Chang, S.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2009.05a
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    • pp.74-77
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    • 2009
  • Demands for high quality and productivity of precision mechanical parts are increasing greatly nowadays due to the rapid growth of information technologies and convergence industries. Therefore, core technologies for fabrication of precision mechanical parts are the fundamental issues, which are the precision machining, micro powder injection molding technologies, MR polishing, micro polymer processes, micro actuation modules and so on. These technologies are directly related to the mass production of high functional devices and machineries. Therefore, this study investigates the fabrication technologies of micro precision molds for advanced devices for possible commercialization in a near future.

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