• Title/Summary/Keyword: Cutting Shape

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In-Process Prediction of the Surface Error Using an Identification of Cutting Depths in End Milling (엔드밀 가공중 절입깊이의 실시간 추정을 이용한 가공오차 예측)

  • 최종근;양민양
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.2
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    • pp.114-123
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    • 1998
  • In the end milling process, the information of the surface errors plays an important role in adaptive control systems for precision machining. As the measuring accuracy of the surface errors directly matches the control's, it is an important factor for evaluating the performance of the system. In order to obtain the surface errors, the prediction using the cutting force, torque, motor power etc. is frequently practiced owing to the easiness in measurement. In the implementation of the prediction, the information on the cutting depths make it concrete and precise. Actually the axial depth of cut limits the range of the calculation. In general, it is not easy to know the cutting depths due to irregular shape of workpieces, inaccurate positioning of them on the table of machine tool, and machining error in the previous cutting. In addition to, even if cutting depths are informed, it is difficult to match the individual position of the cutter on the varying shape of the work material. This work suggests an algorithm estimating the cutting depths based on cutting force and makes it precise to predict the surface error. The proposed algorithm can be applied in more extensive cutting situations, such as presence of the tool wear, change of the work material hardness, etc.

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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 Effect of Drape by the Construction Method of th eCircular Skirt (Circular Skirt의 구성방법에 따른 Drape효과에 관한 연구)

  • 홍정민
    • Journal of the Korean Society of Costume
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    • v.33
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    • pp.217-228
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    • 1997
  • The purpose of this study was to investigate influence of the construction method of the circular skirt on drapability and shape of static silhouette and length variation. In made 24 types of skirts giving the variations (six kinds of peach skin-like finished fabrics two types of cutting method two types of machine stitch method of hem), The results were as follows: 1. Analysis of drapability In the cutting method thre was similarity between warp direction and true bias direc-tion. In the machine stitch method of hem there was similarity between blind stitch and blind stitch machine. According to the fabrics analysis of drapability was excellent in the order N/P 80/20(fabric 1)>P 100(fabric 5)>P 100(fabric 6)>P 100 (fabric 2)>P 100 (fabric 4)>N/C 50/50(fabric 3). 2. Analysis of the characteristics values of static silhouette shape In the cutting method shape of static sil-houette became wide in the warp direction. In the machine stitch method of hem shape of static silhouette became wide in the blind stitch. According to the fabrics shape of static silhouette became most wide in the N/C 50/50(fabric 3) and shape of static sil-houette become most narrow in the P 100(fabric 2,5) 3. Analysis of the length variation In the cutting method the true bias direc-tion was longer than the warp direction. In the machine stitch method of hem there was simi-machine stitch method of hem there was simi-larity between blind stitch and blind stitch ma-chine. In fabrics the P 100(fabric 6) showed the longest the N/C 50/50(fabric 3) showed most slight. Interaction between the cutting and messure-ment part of skirt lengh. In the warp diretion parts that showed longest length variation were C. G, K, O in the true bias diretion parts that showed most slight length variation were A, E, M, I.

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Development of the Spent Fuel Rod Cutting Device by Cutter Blade Method (Cutter blade 방식에 의한 사용후핵연료봉 절단 장치 개발)

  • 정재후;윤지섭;홍동회;김영환;김도우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.11a
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    • pp.393-396
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    • 2000
  • Spent fuel rod cutting device should cut a spent fuel rod to an optimal size in order to fast decladding operation. In this paper, for developing spent fuel rod cutting device with cutter blade, rod properties such as dimension and material of zircaloy tube and fuel pellet are investigated at first and then, various methods of existing cutting devices used commercially are investigated and their performance are analyzed and compared. This device is designed to be operated automatically via remote control system considering later use in Hot-Cell (radioactive area) and the mdularization in the structure of this device makes maintenance easy. SUS and Zircaloy-4 are selected as cut material used in the test of spent fuel rod cutting device by cutter blade. In order for constructing the high durable cutter blade, various materials are analyzed in terms of quality, shape, characteristic, and heat treatment, etc. and from these results, spent fuel rod cutting device is designed and manufactured based on the considerations of durability, round shape sustainability of rod cross-section, debris generation, and fire risk, etc.

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A Study on Effect of Tool Wear Rate upon Cutting Tool Shape in a Titanium Rough Cut Machining (티타늄 황삭가공에 있어서 공구형상이 공구마모율에 미치는 영향에 관한 연구)

  • Jung, Hwa
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.10
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    • pp.27-33
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    • 2019
  • The aviation industry has grown beyond the simple processing and assembling of aircraft parts and now designs and exports finished aircraft. In this study, the vertical CNC milling rotational speed and feed rate were parameters to investigate the life of tools according to their shape: (flat, round, and ball end mill) in the rough cutting of titanium. These tools are widely used in aircraft manufacturing and assembly. The purpose of this study is to measure the cutting temperature generated during the cutting process and calculate the rate of tool wear. This will be accomplished by measuring the tool weight before and after cutting the specimen and to compare it with the results of previous studies. Our study showed that the maximum cutting temperature increased as cutting time, tool rotational speed, and feed rate increased. The highest cutting temperatures were recorded for the ball, round, and flat end mill, respectively. Tool wear for the ball, round, and flat end mill increased as the speed and feed rate increased. The flat end mill exhibited the highest rate of wear from a minimum of 0.62% to a maximum of 2.88%.

A study of burr formation on microgrooving for fresnel lens mould (프레넬렌즈 금형용 미세홈 가공에 있어서 버 발생 경향에 관한 연구)

  • 임한석;안중환
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.3
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    • pp.28-34
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    • 1997
  • The side burrs and shape distortion resulting from the micromachining of an array of V-shape microgrooves in fresnel lens mould were experimentally invesigated. The focus of this study is on the influence of depth of cut and prism angle on the burr growing rate. The main experiments were con- ducted on the single prism cutting for the convinient of measuring the burr shape and cutting force. From the observation of the burr shape and burr growing rate, it was found that there exits a critical depth of cut below which the burrs are more or less irregular and weak. But above that critical value, the burrs are re- latively clear and stiff.

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Effect of Geometrical Similarity between Twist Drill on the Shape of Chip Produced. (드릴구멍 상사성이 칩형상에 미치는 영향)

  • 최만성
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.6
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    • pp.118-126
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    • 2000
  • In this study, geometrical similarity conditions for drills of various diameters are discussed. The effect of geometrical similarity on the chip shape and forces of different sized conventional drills has been experimentally confirmed. Drilling tests are carried out for SM45C by using the conventional HSS drills. The torque and thrust forces are measured and compared with those chip forms. Chip shape in drilling are affected by three factors being flow angle, side and up curl of the chip. It is found that the feedrate and drill diameter are more affected than cutting speed on the chip form and cutting forces. The similarity conditions gives easily to estimate the chip shape, the thrust and the torque for drills of different diameters.

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Development of smart CAD/CAM System for Machining Center Based on B-Rep Solid Modeling Techniques(ll) (A study on the 3-D CNC Cutting Planning Method Using Solid Model) (B-Rep 솔리드모델을 이용한 머시닝센터용 CAD/CAM시스템 개발(II)(솔리드모델을 이용한 3차원 CNC가공계획에 관한 연구))

  • Yang, Hee-Goo;Kim, Seok-Il
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.3
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    • pp.158-164
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    • 1996
  • In this paper, the CNC cutting planning module for product with three dimensional solid shape is realized to develop a smart CAD/CAM system which performs systematically from the shape design of procuct by the B-Rep solid modeler to the CNC cutting of product by a machining center. The three dimensional solid shape of product can be easily designed and constructed by the Euler operators and Boolean operators of the solid modeler. And the various functions such as the automatic generation of tool path for the rough and finish cutting processes, the automatic elimination of overcut, the automatic generation of CNC code for the machining center and do on, are established. Especially, the overcut-free tool paths are obtained by splitting the CL solid which is composed of the offset surfaces of the solid shape of product.

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