• Title/Summary/Keyword: Material and part control

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Process Design for Yoke Forming of Unmanned Helicopter (무인헬기용 요크 성형을 위한 공정 설계)

  • Hur, Kwan-Do;Kim, Ki-Sung;Chun, Se-Young
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.8 no.4
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    • pp.28-33
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    • 2009
  • Yoke is a part of rotor in unmanned helicopter. It was transferred power of engine to the rotor. It has been usually produced by machining and used wastefully material. And it has been considered to improve its proof stress against repeated loading of the products. Therefore we studied Forging process for satisfaction of these ability and process design for yoke forming has been studied by using FE analysis. Die design and forming analysis have been performed according to the conditions such as billet volume, flash control, cavity filling, and the distribution of damage in the products. In the comparison between die forging processes, side punch effects has been investigated by considering billet dimensions.

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An Archival Study on the Arrangement and Description of Old Document(Diploma) (고문서 정리(整理)에 대한 기록학적 연구 - 새로운 고문서 정리 방법의 모색을 위하여 -)

  • Cho, Kyung-Koo
    • The Korean Journal of Archival Studies
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    • no.7
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    • pp.37-74
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    • 2003
  • An Old document(Diploma) is a historical and unique record, so it must be collected, arranged, and preserved for research as soon as possible. Especially, for the effective use of the Old Document(Diploma), it is needed to arrange and describe the material systematically on the ground of modern archival theory. The Kyujanggak Archives in the Seoul National University has published 23 volumes of Old document(Diploma) material Old Document(Diploma). But they seem to cause the readers inconvenience, because the materials are classified and gathered only by genre, the titles or the orders of the materials are not standardized, and there is no description about the content of each Old document(Diploma). Jangseo-gak Library in The Academy of Korean Studies has also published the series of Old document(Diploma) material Old Document(Diploma) Collection. However the case is not different, since they are all mixed up with materials classified and gathered by genre, family, academy, or local school. And a great part of the materials have no titles and no description about the content of each Old document(Diploma), either. About the arrangement and description of the records, European and American archival science has established the theory of l)the principle of provenance, 2)the principle of original order, 3)levels of control, 4)collective description. These theories are valuable for the effective use of Old document(Diploma). On the viewpoint of the principle of provenance, Old document(Diploma) materials should not be classified by subject and genre, but by family and person. Then, the Old document(Diploma) materials, after collected by the unit of family or person on the viewpoint of the principle of provenance, should be arranged in their original order for more detailed arrangement and furthermore, for the work to find their relationship. This is so called the principle of original order. The hierarchical management of the Old document(Diploma) materials, for example, classifying by record group, sub-group, series, item and so on, is the concept of the levels of control, and comprehensive description of the each hierarchical structure is the concept of the collective description. Let's apply these archival theories to 34 pieces of the Chung, Man-Seok's material in the series of Old document(Diploma) material Old Document(Diploma). First, collect the Old document(Diploma) materials into Chung, Man-Seok's collection(the principle of provenance), which were scattered in the series classified by genre. Secondly, rearrange them chronologically(the principle of original order), and then we can find the comprehensive information about Chung, Man-Seok. For the hierarchical management of the Old document(Diploma) materials, we should establish a few concepts from the general, large group to specific, small item. The concepts can be organized as following; l)record group(Chung, Man-Seok record group) - 2)sub-group(personnel document, property document, family document, social activity document, political activity document, etc) - 3)series(gyoji-series, gyoseo-series, yuji-series etc. in the personnel document) - 4)folder(document with additions) - 5)item(one document). According to the the theory of the collective description, in the level of record group, there should be a collective description of Chung, Man-Seok's biography or a summary of record group. Similarly, there should be a collective description of a summary of sub-group in the level of sub-group and a summary of series in the level of series.

Fiber Optic Bragg Grating Sensor for Crack Growth Detection of Structures (구조물의 균열 진전 탐지를 위한 광섬유 브래그 격자 센서)

  • Kwon, Il-Bum;Seo, Dae-Cheol;Kim, Chi-Yeop;Yoon, Dong-Jin;Lee, Seung-Seok
    • Journal of the Korean Society for Nondestructive Testing
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    • v.27 no.4
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    • pp.299-304
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    • 2007
  • There are to be some cracks on the material degradation part or the stress concentration parts of the main members, which carry on over-loads, of structures. Because these cracks can be used to evaluate the structural health status, it is important to monitor the crack growth for maintaining the structural safety. In this study, the fiber Bragg grating sensor with a drop ball was developed as a sensor for crack growth detection of an existing crack. The crack growth detection sensor was constructed with three parts: a probe part, a wavelength controling light source and receiver part, and an impact part. The probe part was just formed with a fiber Bragg grating optical fiber The wavelength controling light source part was composed of a current supplying circuit, a DFB laser diode, and a TEC controling circuit for wavelength control. Also, the impact part was just implemented by dropping a steel ball. The performance of this sensor was confirmed by the experiments of the crack detection with an aluminum plate having one existing crack. According to these experiments, the difference of the sensor signal outputs was correlated with the crack length. So, it was confirmed that this sensor could be applied to monitor the crack growth.

Automatic Feneration of BOM Using Knowledge-Based System (지식 베이스를 이용한 CAD 도면에서의 BOM 자동생성)

  • 이영엽;도남철;장수영;최인준;정무영;박춘렬
    • 제어로봇시스템학회:학술대회논문집
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    • 1993.10a
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    • pp.970-974
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    • 1993
  • This paper is concerned with an automatic generation of BOM (Bill Of Material) for a bicycle frame set using a knowledge based system. The major components module system includes : (1) Part information retrieval in CAD drawing, (2) BOM code generation rule, and (3) Database interface. The knowledge based system includes a rule base and a fact base. The fact base consists of basic, variant, and optional components of the standard BOMs of frame sets. The rule contains rules for generating new BOM code in case that the specified is not in the database. The system was implemented on a SUN workstation under Open Windows environments. AutoCAD for CAD drawing was also used.

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A Study on Intelligent Generator of Optimal Process Conditions to Avoid Short Shot (미성형 방지를 위한 최적조건 생성 시스템 연구)

  • 강성남;허용정;조현찬
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.12
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    • pp.33-37
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    • 2002
  • A short shot is a molded part that is incomplete because insufficient material was injected into the mold. Remedial actions to control the process conditions can be taken by the injection molding experts based on their knowledge and experience. However, it is very difficult for the non-experts to avoid short shot by finding the proper process conditions such as mold temperature, melt temperature and filling time. In this paper, an intelligent generator of the optimal process conditions based upon fuzzy logic algorithm is proposed so that trial and error can be minimized and the non-experts as well as the experts can also find the optimal process conditions.

A new color management approach for dye manufacturing process with image processing and intelligent algorithm

  • Kyungwon Jang;Taechon Ahn;Lee, Dongyoon;Yangwoong Yoon;Jinhyun Kang
    • 제어로봇시스템학회:학술대회논문집
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    • 2002.10a
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    • pp.56.2-56
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    • 2002
  • A dye process of textile industry is important part that finally gives required quality to the textile material. To produce a proper dye for the customers, color management that precise color measurement from original color sample and rapid estimation of corresponding color recipe is most essential. In the practical dye manufacturing process, color management falls into two categories. First one is color management with an expert knowledge of colorist, the other one is computer aided way. In the former management way, color management fully depends on colorists' expert without support of the measurement and computational devices. Objective color management is impossible in this way. The...

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A Study on Intelligent Generator of Optimal Process Conditions to Avoid Short Shot (사출성형용 지능형 미성형 방지 최적조건 생성 시스템 연구)

  • 강성남;허용정;조현찬
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.402-405
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    • 2001
  • A short shot is a molded part that is incomplete because insufficient material was injected into the mold. Remedial actions to control the process conditions can be taken by the injection molding experts based on their knowledge and experience. However, it is very difficult for the non-experts to avoid short shot by finding the proper process conditions such as mold temperature, melt temperature and filling time. In this paper, an intelligent generator of the optimal process conditions based upon fuzzy logic algorithm is proposed so that trial and error can be minimized and the non-experts as well as the experts can also find the optimal process conditions.

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Optimal Design of a Ultra-precision Planar X-Y Stage (초정밀 평면 X-Y스테이지의 최적 설계)

  • Cho, Woong;Ko, Hyun-Jun;Kim, Jong-Hyeong
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.1193-1197
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    • 2008
  • Bridge is Most from stay of Gantry structures part. In compliance with oneself weight of the bridge deflecting, this occurs drops the location precision of the work tool. Also accelerative at the time of gives a serious load to Y axial motors which transfer the bridge damages. The motor with high-speed transfer of location control which is accurate makes disrupt. The malleability of the bridge to maintain consequently and necessary to minimize a weight. This paper the structural FEM interpretations of the stone and the aluminum alloy with the material by which will be used in the bridge and static deflected and a candle precise plane X-Y stage optimal design with character the interpretation result.

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Hydro-forming Process Control and Design Concept of Automotive Rear Sub-frame Components Through Cross Sectional Analysis (단면 분석을 통한 자동차용 리어 서브-프레임 하이드로포밍 부품의 공정 제어 및 설계)

  • Kim, Kee Joo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.9
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    • pp.1-6
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    • 2018
  • Hydro-forming technology has spread dramatically throughout automotive industry over the last 20 years. This technology has many advantages for automotive applications in terms of better structural integrity of the parts, lower cost from fewer parts, material savings, weight reduction, lower springback, improved strength, durability, and design flexibility. In this study, various simulation technologies were developed to investigate the formability of hydro-forming components. Through this technology, to establish the effective forming process for appropriate components design, the bending process, pre-forming process, die closing process, etc. were considered for good forming. This paper proposes the forming amount, section length (corresponding to the hydro-forming press capacity), and minimum curvature (curvature effect evaluation according to the hydro-forming pressure) among the considerations in the design of the hydro-forming part. In addition, a design method is proposed for hydro-forming molding by carrying out cross section analysis of a real sub-frame part for automobiles. The effects of pre-bending, axial feed, hydraulic pressure, press load, and friction among the hydro-forming process parameters were analyzed. Therefore, whether these processes are necessary factors for hydro-forming were examined.

Improved evaluation of ring tensile test ductility applied to neutron irradiated 42XNM tubes in the temperature range of (500-1100)℃

  • Gurovich, B.A.;Frolov, A.S.;Fedotov, I.V.
    • Nuclear Engineering and Technology
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    • v.52 no.6
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    • pp.1213-1221
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    • 2020
  • Chromium-nickel alloy 42XNM (XHM-1, Bochvalloy) is considered as a promising material for future generations of nuclear reactors, primarily as a material for the fuel elements shells in the development of accident tolerant fuel. However, as with most nickel-based alloys, 42ХNМ is characterized by a sharp decrease in plastic properties in the temperature range of (500-900)℃. This effect is enhanced by neutron irradiation. Preliminary tests of ring samples of 42XNM alloy (after irradiation as a part of the VVER-1000 control system) in the temperature range of ductility failure showed that the standard technique for processing tensile diagrams does not allow to evaluate the plastic properties correctly at low strains. Therefore, in this work, the alternative method for testing ring samples from materials with low plastic characteristics was developed. It was shown that the minimum value of the permanent strain of the irradiated 42XNM alloy in the temperature range of (500-1100)℃, determined by the alternative method, was ~1.6% at 750 ℃.