• Title/Summary/Keyword: Manufacturing Line

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Development of Variable Deposition Manufacturing for Ethylene Vinyl Acetatecopolymer (EVA를 이용한 가변 용착 쾌속 조형 공정 개발)

  • 이상호;신보성;정준호;안동규;양동열
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.05a
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    • pp.771-774
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    • 2000
  • RP techniques have inherent disadvantages caused by their working principles: stair-stepped surface of parts due to layer-by-layer stacking of layers, low build speed caused by line-by-line solidification to finish one layer, and post processing to improve surface finish, etc. The objective of this study is to propose a new RP technique, variable deposition manufacturing (VDM), which can make up for the disadvantages of the existing RP techniques, and to develop an apparatus to implement the technique. The proposed process can greatly reduce the building time and improve the surface finish of parts generated. The experiments are carried out to obtain the range of temperature of molten material to maintain its fluidity and to investigate the effect of gas cooling on the preservation of the slopes. Based on the results, some simple shapes such as a line-shape. an S-shape, and a circle-shape were fabricated from Ethylene Vinyl Acetatecopolymer (EVA). In order to examine the applicability of VDM to more general shapes, a tensile specimen and a yo-yo shape were manufactured by the proposed RP method using EVA material as the first trial approach. The present basic study has shown the possibility of a practicable utilization of the proposed VDM process to prototyping of a general three-dimensional shape.

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An Analytical Study on the Thermal-Structure Stability Evaluation of Mill-Turn Spindle with Curvic Coupling (커빅 커플링을 적용한 밀-턴 스핀들의 열-구조 안정성 평가에 관한 해석적 연구)

  • Lee, Choon-Man;Jeong, Ho-In
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.1
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    • pp.100-107
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    • 2020
  • As demand for high value-added products with hard materials increases, the line center is used for producing high value-added products in many industries such as aerospace, automobile fields. The line center is a key device for smart factory automation that can improve the production efficiency and the productivity. Therefore, the development of a mill-turn line center is necessary to produce high value-added products with complex shapes flexibly. In the mill-turn process, a milling process and a turning process are combined. In particular, the turning process needs to increase the rigidity of the spindle. The purpose of this study is to analyze the thermal-structural stability through thermo-structural coupled analysis for a mill-turn spindle with a curvic coupling. The maximum temperature and thermal stability of the spindle were analyzed by thermal distribution. In addition, the thermal deformation and thermal-structural stability of the spindle were analyzed through thermo-structural coupled analysis.

A Study on Simulation of Chip Recycling System for the Management of Cutting Chip in 5-Axis FMS Line (5축 FMS라인의 절삭 칩 처리를 위한 칩 회수처리장치 시뮬레이션에 관한 연구)

  • Lee, In-Su;Kim, Hae-Ji;Kim, Deok-Hyun;Kim, Nam-Kyung
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.12 no.6
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    • pp.175-181
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    • 2013
  • The primary element of machining automation is to maximize the utilization of machine tools, which determines the output and lead-time. In particular, 95% of raw materials for wing ribs are cut into chips and 0.6 ton of chips are generated every hour from each machine tool. In order to verify the chip recycling system that controls the chips from the machines in five-axis FMS line, a simulation of the virtual model is constructed using the QUEST simulation program. The optimum speed of the chip conveyor and its operating conditions that directly affect the efficiency of the FMS line are presented including the chip conveyor speed, the maximum capacity of the hopper, and the number of chip compressors.

Digital Manufacturing based Modeling and Simulation of Production Process in Subassembly Lines at a Shipyard (디지털 생산을 기반으로 한 조선 소조립 공정 모델링 및 시뮬레이션)

  • 이광국;신종계;우종훈;최양렬;이장현;김세환
    • Proceedings of the Korea Society for Simulation Conference
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    • 2003.11a
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    • pp.185-192
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    • 2003
  • Digital Manufacturing-based production could be very effective in shipbuilding in order to save costs and time, to increase safety for workers, and to prevent bottleneck processes in advance. Digital shipbuilding system, a simulation-based production tool, is being developed to achieve such aspects in Korea. To simulate material flow in a subassembly line at a shipyard, the product, process and resources was modeled for the subassembly process which consisted of several sub-processes such as tack welding, piece alignment, tack welding, and robot welding processes. The analysis and modeling were carried out by using the UML(Unified Modeling Language), an object-oriented modeling method as well as IDEF(Integration DEFinition), a functional modeling tool. Initially, the characteristics of the shop resources were analyzed using the shipyard data, and the layout of the subassembly line was designed with the resources. The production process modeling of the subassembly lines was performed using the discrete event simulation method. Using the constructed resource and process model, the productivity and efficiency of the line were investigated. The number of workers and the variations In the resource performance such as that of a new welding robot were examined to simulate the changes in productivity. The bottleneck process floated according to the performance of the new resources. The proposed model was viewed three-dimensionally in a digital environment so that interferences among objects and space allocations for the resources could be easily investigated

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Manufacturing Preparations in the New Car Development for an Automotive Body Shop by Digital Manufacturing Technologies (차체공장 디지털생산 기술 적용을 통한 신차 개발 생산준비 업무 수행)

  • 노상도;박영진
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.6
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    • pp.118-126
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    • 2003
  • Digital Manufacturing is a technology facilitating effective developments and agile productions of the product via digital computer models representing physical and logical schema and the behavior of the real manufacturing systems including manufacturing resources, environments and products. For the successful application of this technology, a digital factory as a well-designed and an integrated environment is essential. In this paper, we constructed the sophisticated digital factory of a Korean automotive company's body shop, and conducted precise simulations of unit cell, lines and the whole factory for the collision check, the production flow analysis and the off-line programming. We expect that this digital factory of the body shop helps us achieve great savings in time and cost for many manufacturing preparation activities of the new car development.

Development of a Thin Glass Vibration Measuring System for Productivity Improvement of LCD Manufacturing Line (LCD 생산라인의 생산성 향상을 위한 초박형 유리진동 계측 시스템의 개발)

  • Oh, Young-Kyo;Lee, Jung-Uk;Sun, Ju-Young;Kwack, Jeong-Seok;Won, Moon-Cheol;Lee, Hyun-Yup
    • Journal of Sensor Science and Technology
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    • v.20 no.5
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    • pp.336-342
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    • 2011
  • Recently, the LCD manufacturing industries try to maximize the productivity of LCD panels due to sharp increase in the market need of LCD display. Usually, the increase in manufacturing speed induces additional vibration of glasses and manufacturing machineries. This kind of vibration can induce bad effects on the manufacturing accuracy, and even can damage the glasses. The vibration signal of glass itself is very useful to predict the allowable maximum level of manufacturing speed. Therefore, it is necessary to measure the vibration of the glass itself and a very thin vibration measurement system attachable on the glass is needed. Since in some processes the glasses need to go through very thin gaps such as 2.5mm, We develop a glass vibration measurement system with the thickness of 1.3mm. The system measures the glass vibration using MEMS type accelerometers and store vibration data in a Nand-Flash memory. The performance of the develop system has been verified on a real LCD manufacturing line and the accuracy of vibration measurement is comparable with that of an accurate commercial vibration measurement system.

A Study on Women's Wears Manufacturing Industries (I) - Focused on Production System - (숙녀복 봉제업계 실태 연구(I) - 생산시스템을 중심으로 -)

  • Uh, Mi-Kyung;Sohn, Hee-Soon;Kim, Jung-Hoon
    • Journal of Fashion Business
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    • v.1 no.1
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    • pp.99-109
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    • 1997
  • The purpose of this study is to survey the conditions of women's wears manufacturing industries and finds out their qualitative problems and suggests the solutions to help women's wears manufacturing industries adapting themselves well to the fashion industries which is being individualized, high profiled and differentiated and thus helpes them to produce the competitive commodities through high-qualities and technological improvements. For this purpose, I had sampled the factories which located in Seoul and Kyunggido areas and produced women's apparels for domestic consumers. The questionnaires for this survey were designed by interviewing the representatives of 31 women's wears manufacturing industries, while the collected data were processed using the SAS statistical program for frequency, percentage, chi-square test, t-test. The results of the survey can be summarized as follows; 1. It was found that women's wears manufacturing industries were getting smaller scale or pettier in terms of capital, number of employees or scale of factory. 2. The number of the employees is getting decrease every year, which is posed as most serious problems of the surveyed manufacturer. Such a decrease of employees may be attributable to the fact that women's wears manufacturing industries are regarded as one of 3D businesses and therefore the employees leave their workspaces for more rewarding service industries. 3. It was found that women's wears manufacturing industries relied on more recontracts than self-productions. In 1995, 83.7% of their productions were out of recontracts, and this rate is getting increase. 4. 51.6% of the surveyed manufacturer operate by straight line system or other types of line system, while 48.4% of the remaining managed a pair system. 5. As a result of surveying the perspective of women's wears manufacturing industries into the 21 st century is as followed. 41.9% of them were optimistic, and 25.8% were pessimistic about their futures.

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3D Extraction Method Using a Low Cost Line Laser (라인레이저를 이용한 3D 모델 추출 방법)

  • Yun, Chun Ho;Kim, Tae Gi;Cho, Yong Wook;Nam, Gi Won;Yim, Choong Hyuk
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.26 no.1
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    • pp.108-113
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    • 2017
  • In this paper, we proposed a three-dimensional(3D) scanning system based on laser vision technique for 3D model reconstruction. The proposed scanning system consists of line laser, camera, and turntable. We implemented the 3D scanning system using low quality elements. Although these are low quality elements, we reduced the 3D data reconstruction errors greatly using two methods. First, we developed a maximum brightness detection algorithm. This algorithm extracts the maximum brightness of the line laser to obtain the shape of the object. Second, we designed a new laser control device. This device helps to adjust the relative position of the turntable and line laser. These two methods greatly reduce the measuring noise. As a result, point cloud data can be obtained without complicated calculations.

Performance Evaluation of Closed Manufacturing Systems with Sampling Inspections (샘플링 검사가 수행되는 폐쇄형 생산 시스템의 성능분석)

  • Lee, Hyo-Seong
    • Journal of the Korean Operations Research and Management Science Society
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    • v.22 no.1
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    • pp.123-140
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    • 1997
  • In this paper we consider closed flow line systems with samploing inspections. The total number of parts in the system is assumed to be N. The processings carried out of each station do not always meet the requirement of quality. Therefore, upon completion of its processing at each station, a part is inspected to determine whether the processings meet the requirement of quality or not. We assume that inspection are done on a random basis. If a part is found to be defective by an inspection, it is fed back to the apropriate station. Two different cases will be considered in this study : a three-station flow line system with infinite buffers and a two-station flow line system with finite buffers. For each case, we will develop an exact method to obtain the performance measures such as throughput, machinen utilization, average outgoing quality and manufacturing lead time. For the case of the two-station flow line system ith finite buffers, we will also develop an approximation method using a stage-aggregation technique. Then using buffers, we will also develop an approximation method using a stage-aggregation technique. Then using these results, we will try to find an optimal inspection policy which maximizes the expected net profit under a certain cost structure. Although we present the results only for the two or three station flow line system in this paper, the results obtained in this paper can be extended easily to the system which consists of more than two or three stations.

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Mixed-product flexible assembly line balancing based on a genetic algorithm (유전알고리듬에 기반을 둔 혼합제품 유연조립라인 밸런싱)

  • Song Won Seop;Kim Hyeong Su;Kim Yeo Keun
    • Journal of the Korean Operations Research and Management Science Society
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    • v.30 no.1
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    • pp.43-54
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    • 2005
  • A flexible assembly line (FAL) is a production system that assembles various parts in unidirectional flow line with many constraints and manufacturing flexibilities. In this research we deal with a FAL balancing problem with the objective of minimizing the maximum workload allocated to the stations. However, almost all the existing researches do not appropriately consider various constraints due to the problem complexity. Therefore, this study addresses a balancing problem of FAL with many constraints and manufacturing flexibilities, unlike the previous researches. We use a genetic algorithm (GA) to solve this problem. To apply GA to FAL. we suggest a genetic representation suitable for FAL balancing and devise evaluation method for individual's fitness and genetic operators specific to the problem, including efficient repair method for preserving solution feasibility. After we obtain a solution using the proposed GA. we use a heuristic method for reassigning some tasks of each product to one or more stations. This method can improve workload smoothness and raise work efficiency of each station. The proposed algorithm is compared and analyzed in terms of solution quality through computational experiments.