• Title/Summary/Keyword: Cutting shop

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Development of an Optimal Cutting Condition Decision System by Neural Network (신경망을 이용한 최적절삭조건부여 시스템 개발)

  • Yang, Min-Yang;Kim, Hyun-Chul;Byun, Cheol-Woong
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.9
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    • pp.111-117
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    • 2002
  • In most machining companies, operators decide the cutting condition, a pair of spindle speed (5) and table federate (F) by experience and subjective judgment. As cutting conditions are determined by operators' experience and ability, inconsistent cutting conditions are given in same operating conditions. The objective of this study is to develop the cutting condition decision system which utilizes shop data and predicts tool life by neural network and eventually leads to the optimal cutting condition. The production time per piece is considered for an optimization object. We will discuss the process of an optimal cutting condition decision by neural network. By this process, a series of shop data is stored. And neural network is constructed for prediction of tool life and the optimal cutting condition is recommended from a cutting condition decision system using the stored shop data. The results show that the developed system is rational in searching the optimal cutting conditions on job operations.

A Study on the Effect of Machining Precision and Shop Floor Environment due to Cutting Fluid Usage (절삭유 사용이 가공정밀도 및 작업환경에 미치는 영향에 관한 연구)

  • Hwang, Joon;Chung, Eui-Sik;Heo, Sung-Jung
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.1004-1007
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    • 2001
  • This paper presents the experimental results to verify the environmental consciousness with economic balances due to cutting fluid behaviors, effectiveness in machining process. Even though cutting fluid improves the machined part quality through the cooling and lubracating effects, its environmental impact is also increased according to the cutting fluid usage. Because cutting fluid are used by experience than science on shop floors, its environmental impact are more serious to human health hazard, shop floor environments. In this study a few cutting parameters are adopted as the machinability index (i.e. ; tool wear and surface roughness), and aerosol mist diffusion rate of cutting fluid as the environment consciousness index. These indeces are analyzed quantitatively via a few experiements. The results of this study can be facilitate the optimization of cutting fluid usage in achieving a balanced environmental consciousness consideration with economic view.

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Exposures to Oil Mist by Metal Machining Shop Workers and Analysis of Some Oils (일부 절삭유 제조 및 취급 사업장의 오일 미스트의 노출농도 및 성분에 관한 연구)

  • 정동인;변상훈;박승현;오세민;문영한
    • Journal of environmental and Sanitary engineering
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    • v.13 no.3
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    • pp.121-127
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    • 1998
  • This study investigated exposures to oil mist obtained from an cutting oil manufacture shop and 5 machining shops and also analysis of some oils. The results were that geometric average concentrations of oil mist were $0.29 mg/m^3$, which was less than current $TLV(5mg/m^3$) in Korea. The proper case of either type of system will ensure that atmospheric concentrations of oil mist in machine shops will be within the TLV. It should be remembered, however, that this TLV was established before there was any suggestion that in the inhalable of oil mist might rarely be carcinogenic, and so it seems prudent to keep atmospheric content as low as possible. The analysis of insoluble cutting oils with GC-MSD showed that considerable suspected PAHs were contained. But soluble cutting oil(KSM-W2) didn't almost contain PAHs.

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Construction of a Verified Virtual NC Simulator for the Cutting Machines at Shipyard Using the Digital Manufacturing Technology (디지털 매뉴팩쳐링 기법을 이용한 절단기기의 검증된 가상 NC 시뮬레이터 구축)

  • Jung, Ho-Rim;Yim, Hyun-June;Lee, Jang-Hyun;Choi, Yang-Ryul;Kim, Ho-Gu;Shin, Jong-Gye
    • Journal of the Society of Naval Architects of Korea
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    • v.42 no.1 s.139
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    • pp.64-72
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    • 2005
  • Digital manufacturing is a technology to simulate the real manufacturing process using the virtual model representing the physical schema and the behavior of the real manufacturing system including resources, processes and product information. Therefore, it can optimize the manufacturing system or prevent the bottleneck processes through the simulation before the manufacturing plan is executed. This study presents a method to apply the digital manufacturing technology for the steel cutting process in shipyard. The system modeling of cutting shop is carried out using the IDEF and UML which is a visual modeling language to document the artifacts of a complex system. Also, virtual NC simulators of the cutting machines are constructed to emulate the real operation of cutting machines and NC codes. The simulators are able to verify the cutting shape and estimate the precise cycle time of the planned NC codes. The validity of the virtual model is checked by comparing the real cutting time and shape with the simulated results. It is expected that the virtual NC simulators can be used for accurate estimation of the cutting time and shape in advance of real cutting work.

A Study on the Determination of Cutting Work Envelope of Articular Robot for H-beam Cutting (H-beam 절단용 다관절 로봇의 절단작업영역 설정에 관한 연구)

  • Park, Ju-Yong;Lee, Yong-Gu
    • Journal of Welding and Joining
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    • v.27 no.6
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    • pp.55-61
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    • 2009
  • This study aims for determination of cutting work envelope of an articular robot for H-beam cutting. The robot has its own work envelope. The cutting of piece with groove requires the specific position of the torch which contracts the work envelope. This study suggested the new method to determine the cutting work envelope for this case. The method simplified the problem by use of the combination of inverse kinematics and forward kinematics. The method was used for cutting the H-beam with groove. The cutting work envelope was determined easily. The result was verified by 3D simulation system which implements the articular robot with 6 axes and the H-beam in the virtual shop.

Atomization Characteristics of Cutting Fluids (절삭유의 미립화 특성)

  • Hwang, Joon;Chung, Eui-Sik;Joung, Jin-Yel;Hwang, Duck-Chul
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.943-946
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    • 2002
  • This paper presents atomization characteristics of cutting fluids. To analyze the behavior characteristics of cutting fluid, analytical approach and experimental measurement were performed to predict the aerosol size, velocity and concentration due to cutting fluid atomization mechanism in machining operation. The established analytical model which is based on atomization theory analyzes the cutting fluid motion and aerosol generation in machining process. The predictive models can be used as a basis for environmental impact analysis on the shop floor. It can be also facilitate the optimization of cutting fluid usage in achieving a balanced consideration of productivity and environmental consciousness.

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A Study on the Endmilling using the Multi-Articulated Robot (다관절 로봇을 이용한 엔드밀 가공에 관한 연구)

  • 최은환;정선환;최성대
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1772-1775
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    • 2003
  • The stiffness of multi-articulated industrial robots is very weak, because their structure is an articulated type with some links and joints. Thus it is known that cutting processes for metals are not accepted in machine shop well, but they have a lot of merits for cutting processes, for example. drilling, tapping. and engraving etc., because of the characteristics of their high degree of freedom. The temptation of cutting aluminium was carried out to investigate the feasibility and the limitations or constrains for cutting metals on them. First the mode shapes of 6-axes FANUC welding robot were taken and analysed, and next the cutting processes were practically carried out on it. The results of study were found out to show the feasibility of cutting processes at end-milling under 6mm of tool diameter. as well as to have some limitations and constrains, for examples, surface roughness and feed rate, depth of cut, cutting force etc..

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Development of Versatile CAM System (PosCAM) Supporting CNC Shop Floor Operation (CNC Shop Floor 조업지원용 다능형 CAM시스템 (PosCAM) 개발)

  • 서석환;지우석;김성구;홍희동;조정훈;정대혁;김창남
    • Korean Journal of Computational Design and Engineering
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    • v.4 no.4
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    • pp.339-349
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    • 1999
  • The punose of this paper is to introduce the comprehensive CAM system (called PosCAM) supporting various function requested from shop floor operators. PosCAM is comported of two subsystems (PosCAM I and PosCAM II) which are designed to make up for the contemporary CAD/CAM systems. PosCAM I is mainly for : a) verifying the part programs written in both custom macros and standard G-codes, b) enhancing machining productivity and quality with built-in cutting conditions and feedrate optimization algorithm. PosCAM II is for : a) efficiently managing the numerous part programs and tool data stored in CNC memory, and b) integratively controlling and monitoring various CNCs from the control center through RS-422 with DNC 2 protocol. The developed systems have been tested via various experiments, and can be Applied for the industrial CNC machine shop as a means for enhancing productivity. The PosCAM system has been implemented and successfully used in the Machine Shop Department of PosCAM since march 1998.

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Analysis of Cutting Fluid Atomization and Environmental Impact through Spin-Off Mechanism in Turning Operation for Environmentally Conscious Machining(II)

  • Hwang Joan;Hwang Duk-Chul;Chung Eui-Sik
    • International Journal of Precision Engineering and Manufacturing
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    • v.6 no.3
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    • pp.3-7
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    • 2005
  • This paper presents the experimental results to verify the atomization characteristics and environmental impact of cutting fluid. Even though cutting fluid improves the productivity through the cooling and lubricating effects, environmental impact due to cutting fluid usage is also increased on factory shop floor. Cutting fluid's aerosol via atomization process can generate human health risk such as lung cancer and skin diseases. Experimental results show that the generated fine aerosol of which particle size less than 10 micron appears near working zone under typical operation conditions. The aerosol concentration also exceeds NIOSH regulations. This research can be provided as a basis of environmental impact analysis for environmental consciousness.

Optimization of Cutting Fluids for Environmentally Conscious Machining (환경친화적 기계가공을 위한 절삭유 최적화에 관한 연구)

  • Hwang, Jun;Jung, Eui-Sik;Liang, Steven Y.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.05a
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    • pp.948-951
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    • 2000
  • This paper presents the analytical and experimental methodology for the prediction of aerosol concentration and size distribution due to cutting fluid atomization mechanism in turnining operation. The established analytical model which is based on atomization theory analyzes the cutting fluid motion and aerosol generation in machining process. The impinging and evaporation experiments were performed to know the particle size and evaporation rate of cutting fluid. The predictive models can be used as a basis for environmental impact analysis on the shop floor. It can be also facilitate the optimization of cutting fluid usage in achieving a balanced consideration of productivity and environmental consciousness.

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