• Title/Summary/Keyword: 포켓 가공

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

  • 경영민;조규갑
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.9
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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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Manufacture of Buff Die using CAD/CAM Systems (CAD/CAM 시스템을 활용한 세라믹 공구 금형제작)

  • 이종선;김형철
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.106-111
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    • 2002
  • The object of this study is a manufacture of burr die using CAD/CAM systems. Systems are consist of AutoCAD, CAM software and CNC milling machine. CAM software is purpose of G-code generation for CNC programming. Then CAM software and CNC milling machine are connect to RS-232-C cable for networking.

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Contour Parallel Tool-Path Linking Algorithm For Pocketing (포켓가공을 위한 오프셋 공구경로 연결 알고리즘)

  • 박상철;정연찬
    • Korean Journal of Computational Design and Engineering
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    • v.6 no.3
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    • pp.169-173
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    • 2001
  • Presented in this paper is a CPO tool-path linking procedure optimizing technological objectives, such as dealing with islands (positive and negative) and minimizing tool retractions, drilling holes and slotting. Main features of the proposed algorithm are as follows; 1) a data structure, called a 'TPE-net', is devised to provide information on the parent/child relationships among the tool-path-elements, 2) the number of tool retractions is minimized by a 'tool-path-element linking algorithm'fading a tour through the TPE-net, and 3) the number of drilling holes is minimized by making use of the concept of the 'free space'.

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The minimum time pocketing cycle for the dialog workshop oriented programming (대화형 작업장 프로그래밍을 위한 최소 시간 포켓 가공 싸이클)

  • 류제석;강성균;전용주
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.848-851
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    • 1996
  • Based on the minimum cutting time criteria, the tool path generation algorithm of a pocket machining is developed as a form of a built-in cycle for the WOP(workshop oriented programming) of a CNC controller. Based on the given CAD database and tool information, an optimal cutting depth and geometric properties can be generated, then six different tool paths will be generated internally and automatically. Finally, the G code which commands tool movements is generated for CNC machining.

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NC Tool Paths Program Development for the Pocket Machining (포켓 가공을 위한 NC 공구경로의 프로그램 개발)

  • Oh, Seon;Kwon, Young-Woong
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.12 no.3
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    • pp.75-81
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    • 2003
  • Pocket machining is metal removal operation commonly used for creating depressions in machined parts. Numerically controlled milling is the primary means for machining complex die surface. These complex surfaces are generated by a milling cutter which removes material as it traces out pre-specified tool paths. To machine, a component on a CNC machine, part programs which define the cutting tool path are needed. This tool path is usually planned from CAD, and converted to a CAM machine input format. In this paper I proposed a new method for generating NC tool paths. This method generates automatically NC tool paths with dynamic elimination of machining errors in 2$\frac{1}{2}$ arbitrary shaped pockets. This paper generates a spiral-like tool path by dynamic computing optimal pocket of the pocket boundary contour based on the type and size of the milling cutter, the geometry of the pocket contour and surface finish tolerance requirements. This part programming system is PC based and simultaneously generates a G-code file.

Offsetting a Region Including Islands for Tool-Path Generation (공구 경로 생성을 위한 아일랜드를 포함하는 영역의 오프셋)

  • Park, Sang-Cheol
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.12
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    • pp.2009-2018
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    • 2001
  • This paper presents a region offsetting algorithm for tool-path generation. The proposed region offsetting algorithm is developed by expanding the 'PWID offset algorithm [Choi and Park, 1999]'designed to offset a simple polygon. The PWID offset algorithm has three important steps; 1) remove 'local invalid ranges'by invoking a PWID test, 2) construct a raw offset owe and 3) remove 'global invalid ranges'by finding self-intersections of the raw offset cure. To develop a region offsetting algorithm, we modified the PWID offset algorithm by expanding the concept of the 'global invalid range'in the third step. The time complexity of the proposed algorithm is approximately Ο(n), where n is the number of points, and it is free of numerical errors for practical purposes. The proposed algorithm has been implemented and tested with various real regions obtained by intersecting a sculptured surface with a plane.

An Algorithm for Reducing the Tool Retraction Length in Zigzag Pocket Machining (Zigzag 포켓가공에서 공구후퇴 길이를 줄이는 알고리듬)

  • Kim, Byoung Keuk;Park, Joon Young
    • Journal of Korean Institute of Industrial Engineers
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    • v.28 no.2
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    • pp.128-138
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    • 2002
  • In this paper, we address how to reduce the length of tool retraction in a zigzag pocket machining. Tool retraction, in a zigzag pocket machining, is a non-cutting operation in which the tool moves to any remaining regions for machining. We developed an algorithm of generating tool retraction length in convex or concave polygonal shapes including islands. In the algorithm, we consider concave areas of cutting direction in the polygonal shape. Considering concave areas of cutting direction, the polygonal shape is decomposed to subregions which do not need any tool retraction. Using the proposed algorithm, we calculated the shortest length of tool retraction in cutting direction. Examples are shown to verify the validity of the algorithm.

A Partitioning Method Recucing the Number of Tool Retractions in Zigzag Pocket Machining (지그재그 포켓 가공에서 공구후퇴 횟수를 줄이기 위한 영역 분할법)

  • 서경천;김재정
    • Korean Journal of Computational Design and Engineering
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    • v.6 no.4
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    • pp.215-221
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    • 2001
  • In the zigzag milling of a pocket having islands, tool retraction is one of the primary factors that decrease productivity. Therefore, tool path with minimum number of tool retraction has been needed. Most researches about this topic have been concentrated on obtaining the optimum solution formulated through the geometric reasoning off pocket. Recently, several attempts were made to simplify this problem into region partitioning in order to get the numerically expressed minimum solution. In this research, a method reducing the number of tool retractions extended from existing region partitioning is provided. Applying the segment that is normal to the reference direction of zigzag milling, region partitioning is carried out and structural elements of the region are searched via graphs of islands and characteristic points. Through the processes presented, the number of region partitioned is less than that of existing processes.

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Micromachining of Pocket by Powder Blasting (Powder Blasting을 이용한 미세 포켓가공)

  • 박경호;최종순;김광현;박동삼
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.1060-1063
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    • 2001
  • The mechanical etching technique has recently been developed to a powder blasting technique for various materials, capable of producing micro structures larger than 100$\mu$m. This paper describes the performance of powder blasting technique in micro-pocketing of stainless steel and the effect of the number of nozzle scanning and the nozzle height on the depth and width of pockets. Experimental results showed that increasing the no. of nozzle scanning and decreasing the nozzle height resulted in the increase of depth and width in pockets. Increase of width results from wear of mask film.

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An Optimal Tool Selection Method for Pocket Machining (포켓형상가공을 위한 최적공구 선정방법)

  • Y.M. Kyoung;K.K. Cho;C.S. Jun
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.7
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    • pp.49-58
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    • 1997
  • In process planning for pocket machining, the selection of tool size, tool path, overlap distance, and the calculation of machining time are very important factors to obtain the optimal process planning result. Among those factors, the tool size is the most important one because the others depend on tool size. And also, it is not easy to determine the optimal tool size even though the shape of pocket is simple. Therefore, the optimal selection of tool size is the most essential task in process planning for machining a pocket. This paper presents a method for selecting optimal toos in pocket machining. The branch and bound method is applied to select the optimal tools which minimize the machining time by using the range of feasible tools and the breadth-first search.

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