• Title/Summary/Keyword: Cutting Operation

검색결과 529건 처리시간 0.028초

작업자의 작업성향상을 위한 작업설계시스템의 개발 (Development of Operation Planning System for Worker's Productivity)

  • 임석진;박병태;박면웅;백승렬;정석재
    • 한국안전학회지
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    • 제22권6호
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    • pp.74-80
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    • 2007
  • In manufacturing industry, machining technology for metal cutting processes has been considered traditional and economic dimensions such as production cost, production time and quality of a final product. However, owing to governmental regulations and the change of owner's cognizance, the safety of the workers becomes important in those fields. In this paper, the operation planning system developed as a key component of CAPP(Computer Aided Process Planning) system is introduced for milling operations. The main issue in the system is to determine the cutting conditions in achieving a balanced consideration of productivity and worker's safety. For this reason, the system performs the modification process of standard cutting conditions to satisfy those requirements. Related to machining safety in metal cutting, representative and habitual mistakes that operators perform without considering carefully the characteristic of machine or work piece are described and then the detailed algorithm and functions of the developed system is introduced and discussed.

채터진동에서의 동적 절삭력의 모델링과 안정성 해석 (A modeling of dynamic cutting force and analysis of stability in chatter vibration)

  • 김정석;강명창
    • 한국정밀공학회지
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    • 제10권2호
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    • pp.161-169
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    • 1993
  • The elimination of chatter vibration is necessary to improve the precision and the productivity of the cutting operation. A new mathematical model of chatter vibration is presented in order to predict the dynamic cutting force from the static cutting data. The dynamic cutting force is analytically expressed by the static cutting coefficient and the dynamic cutting coefficient which can be determined from the cutting mechanics. The stability analysis is carried out by a two degree of freedom system. The chatter experiments are conducted by exciting the cutting tool with an impact hammer during an orthogonal cutting. A good agreement is shown between the stability limits predicted by theory and the critical width of cut determined by experiments.

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선박 및 해양 플랜트용 H-빔 절단을 위한 3차원 형상 모델링 구현 시스템 개발 (Development of 3D Modeling System to Display the Cutting Shape of H-Beam Used in Ships and Ocean Plants)

  • 박주용;조효제;이지훈;박지용
    • 한국해양공학회지
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    • 제25권3호
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    • pp.47-52
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    • 2011
  • 3D geometric modeling has a lot of advantages in the field of design and manufacturing. Many manufacturing processes and production lines are using 3D geometric modeling technique. These help reduce the cost and time for manufacturing. The purpose of this study is the realization of a 3D cutting shape for an H-Beam used in ships and ocean plants. The complex 3D cutting shapes could be represented by using the boolean operation of basic figures. Graphic functions with parameters were used to simply define the basic figures. The developed system can show the complex cutting shape of an H-beam simply and quickly. This system can be utilized for the automatic cutting system for an H-beam.

다구찌 실험 계획법을 이용한 고속가공에서 공구수명 조건의 최적화 (Optimal Cutting Condition of Tool Life in the High Speed Machining by Taguchi Design of Experiments)

  • 임표;양균의
    • 한국기계가공학회지
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    • 제5권4호
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    • pp.59-64
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    • 2006
  • High Speed Machining(HSM) reduces machining time and improves surface accuracy because of the high cutting speed and feedrate. Development of HSM makes it allowable to machine difficult-to-cut material and use small-size-endmill. It is however limited to cutting condition and tool material. In the machining operation, it is important to check main parameter of tool life and select optimal cutting condition because tool breakage can interrupt progression of operation. In this study, cutting parameters are determined to 3 factors and 3 levels which are a spindle speed, a feedrate and a width of cut. Experiment is designed to orthogonal array table for L9 with 3 outer array using Taguchi method. Also, it is proposed to inspect significance of the optimal factors and levels by ANOVA using average of SN ratio for tool life. Finally, estimated value of SN ratio in the optimal cutting condition is compared with measured one in the floor shop and reduction of loss is predicted.

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정면밀링커터의 최적설계에 대한 연구(1) -절삭력 중심으로- (A Study on Optimal Design of Face Milling Cutter Geometry(I) -With Respect to Cutting Force-)

  • 김정현;김희술
    • 대한기계학회논문집
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    • 제18권9호
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    • pp.2211-2224
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    • 1994
  • On face milling operation a new optimal cutter, which can minimize the resultant cutting forces, was designed from the cutting force model. Cutting experiments were carried out and the cutting forces of the new and conventional cutters were analyed in time and frequency domains. The resultant cutting forces were used as the objective function and cutter angles as the variables. A new optimal cutter design model which can minimize the resultant cutting forces under the constraints of variables was developed and its usefulness was proven. The cutting forces in feed direction of the newly designed cutter are reduced in comparison with those from the conventional cutter. The magnitudes of an insert frequency component of cutting force from the newly designed cutter are reduced than those from conventional cutter and the fluctuations of cutting force are also reduced.

차량 소음기용 다공파이프 자동절단 메커니즘 설계에 관한 연구 (A Study on the Design of the Automatic Cutting Mechanism of the Perforation Pipes in an Automobile Muffler)

  • 김용석;정찬세;양순용
    • 한국생산제조학회지
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    • 제20권3호
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    • pp.350-356
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    • 2011
  • In this paper, we proposed the automatic cutting mechanism of the perforation pipes in an automobile muffler. This cutting mechanism makes continuous work possible, because it performs the batch work via the sequential operation of loading, feeding, cutting, and discharging. The proposed cutting mechanism consists of the frame unit, escape unit, turning unit, feeding unit, vision system, clamping unit, spindle/cutting unit and cooling unit. And, these mechanisms have been modularized through mechanical, dynamical and structural optimized design using the SMO (SimDesigner Motion) analysis module. Also, the virtual prototype was carried out using the 3-D CAD program. The cutting process cycle is performed in the order of loading, vision processing, feeding, clamping, cutting and discharging. And the cycle time for cutting one piece was designed to be completed in four seconds.

절삭조건과 절삭력 파라메타를 이용한 공구상태 진단에 관한 연구(II) -의사결정 - (A Study on the Diagnosis of Cutting Tool States Using Cutting Conditions and Cutting Force Parameters(II) -Decision Making-)

  • 정진용;서남섭
    • 한국정밀공학회지
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    • 제15권4호
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    • pp.105-110
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    • 1998
  • In this study, statistical and neural network methods were used to recognize the cutting tool states. This system employed the tool dynamometer and cutting force signals which are processed from the tool dynamometer sensor using linear discriminent function. To learn the necessary input/output mapping for turning operation diagnosis, the weights and thresholds of the neural network were adjusted according to the error back propagation method during off-line training. The cutting conditions, cutting force ratios and statistical values(standard deviation, coefficient of variation) attained from the cutting force signals were used as the inputs to the neural network. Through the suggested neural network a cutting tool states may be successfully diagnosed.

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피삭재와 공구재종의 상관관계에 근거한 적정 절삭조건의 결정 (Determination of Optimal Cutting Conditions Based on the Relationship between Tool Grade and Workpiece Material)

  • 한동원;고성림;이건우
    • 한국정밀공학회지
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    • 제15권6호
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    • pp.79-89
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    • 1998
  • In determining optimal cutting condition for face milling operation, tool wear is an important factor. For the purpose of establishing the relationship between various machining factors and tool wear, cutting tests have been performed. As a result, hardness and chemical composition of workpiece material, chemical composition and grain size of cutting tool and cutting speed have been selected as machining factors. In addition, relationship between feed rate and workpiece hardness has been observed. Prior to utilizing cutting conditions recommended by ‘Machining Data Handbook(MDH)’ as a knowledge base, an analysis for the validity of the MDH has been provided. Based on this analysis, tool life criteria applied by MDH has been modified. Finally, using MDH recommended data for neural network trainning, the results from the trained neural network for optimal cutting condition for some given workpiece and cutting tool can be used as reference cutting conditions.

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3차원 포켓가공을 위한 절삭층 형성 및 공구선정 (Generation of Cutting Layers and Tool Selection for 3D Pocket Machining)

  • 경영민;조규갑
    • 한국정밀공학회지
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    • 제15권9호
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    • pp.101-110
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    • 1998
  • In process planning for 3D pocket machining, the critical issues for the optimal process planning are the generation of cutting layers and the tool selection for each cutting layers as well as the other factors such as the determination of machining types, tool path, etc. This paper describes the optimal tool selection on a single cutting layer for 2D pocket machining, the generation of cutting layers for 3D pocket machining, the determination of the thickness of each cutting layers, the determination of the tool combinations for each cutting layers and also the development of an algorithm for determining the machining sequence which reduces the number of tool exchanges, which are based on the backward approach. The branch and bound method is applied to select the optimal tools for each cutting layer, and an algorithmic procedure is developed to determine the machining sequence consisting of the pairs of the cutting layers and cutting tools to be used in the same operation.

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콤바인 예취장치의 절단특성에 관한 연구(II) -2배형, 2중형 칼날의 절단특성- (Cutting-Pattern and Cutting Characteristics of the Reciprocating Cutter-bar of Combine Harvester(II)- Cutting Characteristics of the Low-Cutting Type and Double Cutting Type Reciprocating Knives-)

  • 이홍주;김홍윤;홍종호;이성범
    • Journal of Biosystems Engineering
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    • 제20권1호
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    • pp.13-21
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    • 1995
  • This study was conducted to investigate the cutting mechanism of reciprocating knife of combine harvester. The cutting operation of reciprocating knife with the arrangement of the low-cutting and the double-cutting was demonstrated through cutting pattern diagram which was drawn by computer graphics. Various kinds and dimensions of reciprocating knives were analyzed using the developed program. The results are summarized as follows (1) The low-cutting type reciprocating knife was represented similar cutting characteristics to the standard type, but the maximum stalk-deflection was decreased as 1/2 level of the standard type. And the first ledger plate should be designed shorter than the second ledger plate. (2) The bunching area and the maximum stalk-deflection for the double cutting knife almost were not changed since cutting velocity ratio of 0.6, but the secondary cut were occurred at ratio of 0.8 and increased rapidly over these ratio. (3) The double cutting knife was recommended for the high speed combine, because its bunching area and the maximum stalk-deflection were decreased as 1/2 level of the standard type. (4) In order to maintain the proper cutting mechanism characterized by the bunching area, the maximum stalk-deflection and the secondary cutting length etc., the adequate cutting velocity at forward speed of 0.5㎧ to 1.2㎧ was from 0.3㎧ to 0.96㎧ for the double cutting knives.

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