• 제목/요약/키워드: Cutting Path

검색결과 254건 처리시간 0.021초

금형 가공 시 최적 가공조건을 결정하기 위한 공구수명 예측 프로그램 개발 (Development of tool-life prediction program to determine the optimal machining conditions in mold machining)

  • 박순옥;김민학;이선경;정성택
    • Design & Manufacturing
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    • 제17권1호
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    • pp.7-12
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    • 2023
  • Recently, with the emergence of the 4th industrial revolution, the demand for smart factories and factory automation is increasing. In this study, a tool life prediction program was developed to select optimal machining conditions using CNC milling equipment, which is widely used in flexible production and automation. The equipment used in the experiment was Hwacheon Machine Tool's 5-axis machining equipment, and the tool used was a 17F2R tool. For the machining path, the down-milling cutting method was selected and long-term machining was performed. The analysis standard for side wear on the tool was set at 0.1 to 0.2 mm, and tool life data and wear data were obtained in the cutting experiment. The program was created through the data obtained from the experiment, and a prediction rate of over 90% was secured when comparing the experimental data and the predicted data.

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VLM-ST 공정의 완전 자동화를 위한 2단계 절단 경로 데이터 생성 방법에 관한 연구 (Generation of Cutting Path Data for Two Steps of the Cutting Process in Full- Automated VLM-ST)

  • 이상호;안동규;김효찬;양동열;박두섭;채희창
    • 한국정밀공학회지
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    • 제21권1호
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    • pp.140-148
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    • 2004
  • A novel rapid prototyping (RP) process, a full-automated transfer type variable lamination manufacturing process (Full-automated VLM-ST) has been developed. In the full-automated VLM-ST process, a vacuum chuck and a rectilinear motion system transfer the EPS foam material in the form of the plate with two pilot holes to the rotary supporting stage. The supplied material is then cut into an automated unit shape layer (AUSL) with a desired width, a desired length, a desired slope on the side surface, and a pair of reference shapes, which is called the guide shape (GS)’, including two pilot holes in accordance with CAD data through cutting in two steps using a four-axis synchronized hotwire cutter. Then, each AUSL is stacked by setting each AUSL with two pilot holes in the building plate with two pilot pins, and subsequently, adhesive is applied onto the top surface of the stacked AUSL by a bonding roller and pressure is simultaneously given to the bottom surface of the stacked AUSL. Finally, three-dimensional shapes are rapidly and automatically fabricated. This paper describes the method to generate guide shapes in AUSL data for the full-automated VLM-ST process. In order to examine the applicability of the method to generate guide shapes, three-dimensional shapes, such as a piston shape and a human head shape, are fabricated from the full-automated VLM-ST apparatus.

Edge Detecting Algorithm을 이용한 OLED 보호 필름의 Real Time Inspection에 대한 연구 (A study on real time inspection of OLED protective film using edge detecting algorithm)

  • 한주석;한봉석;한유진;최두선;김태민;고강호;박정래;임동욱
    • Design & Manufacturing
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    • 제14권2호
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    • pp.14-20
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    • 2020
  • In OLED panel production process, it is necessary to cut a part of protective film as a preprocess for lighting inspection. The current method is to recognize only the fiducial mark of the cut-out panel. Bare Glass Cutting does not compensate for machining cumulative tolerances. Even though process defects still occur, it is necessary to develop technology to solve this problem because only the Align Mark of the panel that has already been cut is used as the reference point for alignment. There is a lot of defective lighting during panel lighting test because the correct protective film is not cut on the panel power and signal application pad position. In laser cutting process to remove the polarizing film / protective film / TSP film of OLED panel, laser processing is not performed immediately after the panel alignment based on the alignment mark only. Therefore, in this paper, we performed real time inspection which minimizes the mechanism tolerance by correcting the laser cutting path of the protective film in real time using Machine Vision. We have studied calibration algorithm of Vision Software coordinate system and real image coordinate system to minimize inspection resolution and position detection error and edge detection algorithm to accurately measure edge of panel.

렌즈절삭용 탄화규소계 공구의 크랙전파 거동 (Crack Path Behavior of SiC Based Tools for Spectacle Lens Cutting)

  • 이영일
    • 한국안광학회지
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    • 제11권2호
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    • pp.85-89
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    • 2006
  • 렌즈 절삭공구의 기계적 특성을 향상시키는 기구에 관한 연구를 하기 위해, 탄화규소와 탄화티타늄을 주재료로 사용되었다. 또한, 소결첨가제로 알루미나와 이트리아를 첨가하였다. 첨가제 조성비는 알루미나와 이트리아비를 1:1로 유지하였다. 이를 $1810^{\circ}C$에서 1시간 일축가압 소결 후 $1860^{\circ}C$에서 3, 6 그리고 12시간 동안 열처리하였다. 열처리 시간이 길어질수록 입자크기는 점점 증가하였다. 미세구조는 주사전자현미경으로 관찰하였으며 이미지프로그램(Image-Pro Plus, Media Cybernetics, Maryland, U.S.A.)으로 상분석 하였다. 파괴기구는 주로 길게 자란 탄화규소 입자에 의한 균열회절에서 일어나고 있음을 알 수 있다. 균열회절기구에 영향을 미친 SiC입자들은 대부분 두께가 $2.3{\mu}m$ 이하였고, 장경비는 2.5 이상이었다. 균열가교도 일부 파괴인성 증진기구에 기여함을 알 수 있다.

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B-스플라인 곡선의 기하특성을 이용한 형상 옵셋 (2) -제어다각형 옵셋에서 발생하는 루프의 제거에 대한 연구- (Shape offsetting using the geometric properties of B-spline curves(2) - A Study on the removal of loops in control polygon offsetting -)

  • 정재현;김희중;조우승
    • Journal of Advanced Marine Engineering and Technology
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    • 제21권4호
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    • pp.381-386
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    • 1997
  • The offsetting method using geometric properties of B-spline control polygon is more faster than using of general normal vector in offset processing. But this method itself does not solve the prob¬lems of loop removal in normal offsetting. Generally the distance between neighborhood spans of B-spline control polygon is greater than the offset distance, the loops are occurred in offsetting. For generating of the more precision tool-path in NC machining, the loops of offset must be removed. In this paper, two methods for loop removal are introduced in offsetting of B-spline curve. One is using the intersection of B-spline control span which being occurred of the loop. The other is using two B-spline curve divisions divided from original B-spline curve or its offset curve. After the inter¬section point of loop was searched, the loop being removed to cusp. Also the method for filleting of cusp is inspected to more precision cutting. It is shown that the offsetting using B-spline control polygon is more effective in the sculptured surface machining.

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Performance of Concrete in Aggressive Environment

  • Aguiar, Jose B.;Camoes, Aires;Moreira, Pedro M.
    • International Journal of Concrete Structures and Materials
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    • 제2권1호
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    • pp.21-25
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    • 2008
  • Surface treatments act as a barrier between the environment and the concrete, preventing or retarding the entry of harmful substances and cutting off the transportation path into concrete. The effectiveness of a surface protection preventing the permeation depends on how close and strongly connected are the resin molecules. This work intends to contribute to a better understanding of the performance of protected concrete in chemically aggressive environments, by presenting results of ion diffusion and resistance to aggressive solutions of several hydrophobic agents and coatings used to protect concrete. Three different types of surface protections were tested: silicone hydrophobic agent, acrylic and epoxy coatings. The obtained results indicate that the overall performance of epoxy resin was better than the other selected types of protections.

평면곡선과 오프셋곡선의 점열화 (A Tessellation of a Planar Polynomial Curve and Its Offset)

  • 주상윤;추한
    • 한국CDE학회논문집
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    • 제9권2호
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    • pp.158-163
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    • 2004
  • Curve tessellation, which generates a sequence of points from a curve, is very important for curve rendering on a computer screen and for NC machining. For the most case the sequence of discrete points is used rather than a continuous curve. This paper deals with a method of tessellation by calculating the maximal deviation of a curve. The maximal deviation condition is introduced to find the point with the maximal deviation. Our approach has two merits. One is that it guarantees satisfaction of a given tolerance, and the other is that it can be applied in not only a polynomial curve but its offset. Especially the point sequence generated from an original curve can cause over-cutting in NC machining. This problem can be solved by using the point sequence generated from the offset curve. The proposed method can be applied for high-accuracy curve tessellation and NC tool-path generation.

피에조 구동기의 마이크로 밀링에서 적응제어를 이용한 원주가공의 성능향상 (Improvement of circular cutting using adaptive control in micro milling with piezo-actuator)

  • 정병묵;고태조;석진우;김희술;박종견
    • 한국정밀공학회지
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    • 제23권1호
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    • pp.201-208
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    • 2006
  • Recently, there are many studies for the micro-machining using Piezo actuator. However, because of its step-by-step motion, it is nearly impossible to increase the machining accuracy for a circular path. To increase the accuracy, it is well known that it is necessary the finer and synchronous movement for x-y axes. Therefore, this paper proposes an adaptive control for finer movement of the actuator, and realizes a synchronous control for the x-y axes. The experimental results show that the machining accuracy is remarkably improved.

레이저보조가공에서 중첩열원에 관한 해석 연구 (Analysis of Overlapping Heat Zones in Laser-Assisted Machining)

  • 백종태;이춘만
    • 한국정밀공학회지
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    • 제32권12호
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    • pp.1023-1029
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    • 2015
  • Laser-assisted machining (LAM) is one of the most effective methods for enhancing the machinability of difficult-to-cut materials, such as titanium alloys and various ceramics, and has been studied by many researchers. LAM is a method that facilitates machining by softening a workpiece using a laser heat source. The advantages of the LAM process are decreases in tool wear, cutting force, and surface roughness. However, when the material is over-heated, melting or burning can occur. This study analyzed the heat source distribution with regard to overlapping of preheating on the laser heating path with an acute angle, a right angle and obtuse angles. Then, a power reduction method was proposed to reduce the melting and burning of the workpiece.

사출금형 CAM 작업 지원용 공구 항목 추천 시스템 개발 (Development of Tool Item Selection System Aiding CAM Procedure for Injection Mold)

  • 김성근;양학진;허영무;양진석
    • 한국정밀공학회지
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    • 제20권1호
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    • pp.118-125
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    • 2003
  • As consumer's desire becomes various, agility of mold manufacturing is the most important factor for competitive mold manufacturer. Decision making process is required to produce optimal result of CAM systems in using commercial CAM system to generate tool path. The paper proposes a methodology fur computer-assisted tool selection procedures for various cutting type of rough, semi-rough and finish cuts. The procedure provides assistance for machining tool selection by analyzing sliced CAD model section of die cavity and core. Information about machining time for the generated NC-code is used to aid the tool selection. The module is developed with commercial CAM API. This module will be used fur the optimization of tool selection and planning process.