• 제목/요약/키워드: Multi-tool

검색결과 1,433건 처리시간 0.037초

유한요소해석을 이용한 세장비가 큰 직사각컴 다단계 성형공정의 금형설계 - Part I. 금형설계 (Tool Design in a Multi-stage Rectangular Cup Drawing Process with the Large Aspect Ratio by the Finite Element Analysis - Part I. Tool Design)

  • 김세호;김승호;허훈
    • 소성∙가공
    • /
    • 제10권2호
    • /
    • pp.144-150
    • /
    • 2001
  • Tool design is introduced in a multi-stage rectangular cup drawing process with the large aspect ratio. Finite element simulation is carried out to investigate deformation mechanisms with the initial tool design. The analysis reveals that the difference of the drawing ratio and the irregular contact condition produces non-uniform metal flow to cause wrinkling and severe extension. For remedy, the modification guideline is proposed in the design of the tool and process. Analysis results confirm that the modified tool design not only improves the quality of a deep-drawn product but also reduces the possibility of failure.

  • PDF

회귀분석을 이용한 열변형 오차 모델링에 관한 연구 (Research on the thermal deformation model ins using by regression analysis)

  • 김희술;고태조;김선호;김형식;정종운
    • 한국공작기계학회:학술대회논문집
    • /
    • 한국공작기계학회 2002년도 추계학술대회 논문집
    • /
    • pp.47-52
    • /
    • 2002
  • There are many factors in machine tool error. These are thermal deformation, geometric error, machine's part assembly error, error caused by tool bending. Among them thermal error is 70% of total error of machine tool . Prediction of thermal error is very difficult. because of nonlinear tendency of machine tool deformation. In this study, we tried thermal error prediction by using multi regression analysis.

  • PDF

진공점진성형에서 복합공구경로가 차량용 외판부 도어패널의 변형특성에 미치는 영향 분석 (Deformation Characteristics of an Automotive Outer Door Panel by Vacuum-assisted Incremental Sheet Forming using Multi-tool paths)

  • 윤형원;박남수
    • 소성∙가공
    • /
    • 제32권4호
    • /
    • pp.208-214
    • /
    • 2023
  • This paper discusses the deformation characteristics of a scaled-down automotive outer door panel with vacuum-assisted incremental sheet forming. The vacuum condition between the die and Al6052-H32 sheet with a thickness of 1.0 mm is reviewed with the goal of improving the geometrical accuracy of the target product. The material flow according to the forming tool path, including the multi-tool path and conventional contour tool path, is investigated considering the degradation of the pillow effect. To reduce friction between the tool and the sheet during incremental forming, automotive engine oil (5W-30) is used as a lubricant, and the strain field on the surface of the formed product is analyzed using ARGUS. By comparing the geometry and material flow characteristics of products under different test conditions, it is confirmed that the product surface quality can be significantly improved when the vacuum condition is employed in conjunction with a multi-tool path strategy.

사파이어 절삭용 다층 전착 다이아몬드 공구에 대한 연구 (A Study on Electro-deposited Multi-layered Diamond Tool for Grinding Sapphire Wafers)

  • 임고운;송길용;홍주화
    • 열처리공학회지
    • /
    • 제30권5호
    • /
    • pp.222-226
    • /
    • 2017
  • Recently sapphire wafer has expected as smart phone cover material, however, brittle nature of sapphire needed edge grinding processes to prevent early initiation of cracks. Electro-deposited multi-layered groove tools with $35{\mu}m$ diamond particles were studied for sapphire wafer grinding. Solid particle flow behaviors in agitated electrolyte was studied using PIV(Particle Image Velocimetry), and uniform particle distribution in Ni bond were obtained when agitating impeller was located lower part of electrolyte. Hardness values of $400{\pm}50Hv$ were maintained for retention of diamond particles in electro-deposited bond layer. Sapphire wafer edge grinding test was carried out and multi-layered $160{\mu}m$ thick diamond tool showed much greater grinding capabilities up to 2000 sapphire wafers than single-layered $50{\mu}m$ thick diamond electro-deposited tools of 420 wafers. The reason why 3 times thicker multi-layered tools than single-layered tools showed 5 times longer tool lives in grinding processes was attributed to self-dressed new diamond particles in multi-layered tools, and multi-layered diamond tools could be promising for sapphire grinding.

정면밀링시 절삭신호측정에 의한 공구마모 검출에 관한 연구 (A Study on Detection of Tool Wear by Cutting Signal Measurements in Multi-insert Face Milling)

  • 김성일
    • 한국생산제조학회지
    • /
    • 제6권4호
    • /
    • pp.124-129
    • /
    • 1997
  • The experimental investigation is mainly focused to detect tool wear by cutting signal measurements in multi-insert face milling SS 41 and STS 304. This research have investigated the effects on the insert number, which has relationship with mean-cutting force. AE(acoustic emission) signal, tool life and surface roughness in machining SS41 and STS 304. The cutting force and AE signal are monitored to analyse the cutting process, The surface roughness of the specimens machined by TiN coated tool with the various insert numbers measured at various cutting speeds, feed rates and depths of cut, The width of flank wear is also observed.

  • PDF

승용차 부품의 정면밀링가공시 공구마모 및 표면거칠기 특성에 관한 연구 (A Study on Characteristics of Tool Wear and Surface Roughness in Face Milling of Automobile Parts)

  • 김성일;오성훈;문상돈;김태영
    • 한국자동차공학회논문집
    • /
    • 제4권5호
    • /
    • pp.223-230
    • /
    • 1996
  • The quality and productivity in machining automobile parts are influenced by various factors such as cutting conditions, vibration, and used tool. To improve the quality and productivity of the automobile parts(torsion beam), lots of research on the evaluation of tool life and control of surface roughness has been required. Therefore, the width of flank wear, cutting force, and surface roughness are monitored to analyse the characteristics of tool wear and surface roughness at different tools. This experimental investigation is mainly focused on the characteristics of the tool wear, tool life and surface roughness in multi-insert milling of automobile parts(torsion beam) by using uncoated tungsten carbide tool(WC), TiN coated tool, and cermet tool.

  • PDF

JLBS의 효율적인 운용을 위한 시뮬레이션 (Simulation for Efficient Employment of JLBS)

  • 남동진;한영신;이칠기
    • 한국시뮬레이션학회:학술대회논문집
    • /
    • 한국시뮬레이션학회 2002년도 춘계학술대회논문집
    • /
    • pp.183-187
    • /
    • 2002
  • JLBS는 multi-server multi-queue 방식을 채택하고 있으며, 각 tool별로 할당된 license 수에 비례하여 system을 할당한다. 그러나 이러한 방식의 문제점은 특정 tool에만 job이 집중될 경우 비효율적이다. 즉 특정 system은 모두 사용되고 있고, queue에는 많은 job이 대기하고, 여타 tool에 해당하는 queue에는 대기하는 job이 없어서 system이 그냥 놀고 있는 현상이 발생한다. 본 논문에서는 이러한 단점을 극복하기 위해 각 tool에 license수에 비례하여 할당되었던 system을 모든 tool들이 system을 공유할 수 있도록 하는 방법을 제안했다. 대신 system의 숫자는 줄이고, license의 숫자는 더 할당하는 방법으로, 기존의 방법보다 더 효율적으로 나타났다.

  • PDF

단인과 다인 정면밀리의 가공특성에 관한 연구 (A Study on Machining Characteristics of Single-insert and Multi-insert Face Milling)

  • Kim, S.I.;Lee, W.R.;Kim, T.Y.
    • 한국정밀공학회지
    • /
    • 제12권4호
    • /
    • pp.19-27
    • /
    • 1995
  • Face milling is required to study cutting process with a view of multipoint cutter. This experimental study mainly deals with the single and multi-insert cutting characteristics using coated tool. Because metal cutting of the single and multi-insert has a large relation to the improvement of productivity, the economic cutting process can be achieved by the analysis of proper metal cutting mechanism. Therefore, machining characteristics of face molling in this paper has been studied by investigating the role of different insert number which is concerned with mean cutting force, the RMS values of AE(acoustic emission) signal, tool life and surface roughness in milling SS 41 and SUS 304. The cutting force and AE signal are monitored to make an analysis of cutting process. The surface roughness of the specimens machined by inserts of different numbers is measured at different speeds, feeds and depth of cut. The width of flank wear is also observed.

  • PDF

정강성을 고려한 5축 복합가공기의 리브 구조 최적설계 (Design Optimization of the Rib Structure of a 5-Axis Multi-functional Machine Tool Considering Static Stiffness)

  • 김승기;김지훈;김세호;윤재웅
    • 한국생산제조학회지
    • /
    • 제25권5호
    • /
    • pp.313-320
    • /
    • 2016
  • The need for high-strength, multi-axis, and multi-functional machine tools has recently increased because of part complexity and workpiece strength. However, most of the machine tool manufacturers rely on experience for a detailed design because of the shortcomings in the existing design technology. This study uses a topology optimization method to more effectively design a large multi-functional machine tool considering static stiffness. The ram, saddle, and column parts are important structures in a machine tool. Hence, they are selected for the finite element method analysis. Based on this analysis, the optimized internal rib structure for those parts is designed for desirable rigidity and weight. This structure could possibly provide the required design technology for machine tool manufacturers.