• Title/Summary/Keyword: Abrasive Flow Machining

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Effect on the Deburring of Spring Collet Burr by Abrasive Flow System (입자유동시스템에 의한 스프링콜릿 버의 디버링 효과)

  • 김정두
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1998.10a
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    • pp.192-197
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    • 1998
  • Abrasive flow machining is useful to abrasive polish a internal or external surface of the free shape dimensional parts, which are used in many fields such as machine tool parts, semi-conductor, and medical component industries. The machining process is that two hydraulic cylinders, which are located surface to surface, are enforce media to the passage between workpiece and tooling part alternately, and then the abrasives included in the media pass the passage and polish the surface of workpiece. The media which is made of polymer and abrasive plays complex have workpiece by its viscoelastic characteristics. In this study, the media for AMF was made by mixing viscoelastic polymer with alumina and silicon carbide abrasive respectively. As a result, alumina include media is also the experiments of deburring the inside burr of in order to analyse the deburring machinability of abrasive flow machining according to various machining parameters which were media flow rate extrusion pressure, passage gap, media viscosity, abrasive content, and abrasive grain size.

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A Study on the Analysis of Abrasive Flow Machining Using the Simulation of media Flow (미디어 유동 시뮬레이션을 이용한 입자유동가공의 해석에 관한 연구)

  • 김지웅
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1996.10a
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    • pp.138-143
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    • 1996
  • The 3-dimensional complex parts which construct automobile and aerospace parts are very difficult to polish by traditional polishing method. Abrasive flow machining is useful to polish an internal or external surface of the 3-dimensional shape part. In this paper media flow between workpiece and tooling part has been simulated and the charateristics of abrasive flow machining process have been analyzed according to various machining conditions by calculating the material removal and surface roughness.

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A Study of Abrasive Flow Machining on EDMed Surfacs of Tool Steel (방전가공된 공구강표면의 연마재 유동가공에 관한 연구)

  • 최재찬;김창호;허관도
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.04a
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    • pp.8-13
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    • 1996
  • A relatively new non-traditional finishing process called Abrasive Flow Machining(AFM) is being used to deburr, polish and radius workpiece or produce compressive residual stresses by flowing an abrasive-laden viscoelastic compound across the surface to be machined. This paper presents the effects of AFM on surfaces of tool steel produced by EDM and W-EDM. Using AFM, white layer produced by EDM is erased almost equally and the amount of metal removal is significantly affected the initally machined surface condition of workpiece. The dimension of workiece is enlarged and its surface roughness is improved as AFM time is increased. The optimal AFM time can be established from the experimental results. It is considered that the grinding method lide AFM is useful to grind complex or slim geometry of workpiece even. Scanning Electron Microscopy(SEM) was used to study the surface characteristics of the workpiece before and after AFM.

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Deburring Characteristics of Frame Hole in Fishing Trackle Reel (휘싱 트래클 릴 프레임홀 면의 디버링특성)

  • 김정두
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1998.03a
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    • pp.203-208
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    • 1998
  • Materials of the Frame hole in fishing trackle reel is made up a number large and small holes. Thus, it is difficult to effective machining. Abrasive flow machining(AFM) is useful to polish a internal or external surface of the 3-dimensional shape parts, which are used in many fields such as aerospace, automative, semi-conductor, and medical component industries. The machining process is that two hydraulic cylinders, which are located face to face, enforce abrasive media to the passage between workpiece and tooling parts alternately, and then the abrasives include in the media pass the passage and polish the surface of workpiece. The media which is made of polymer and abrasives plays the role of the tool for deburring or polishing complex shap workpiece by its viscoelastic characteristics. In this study, the abrasive media for abrasive flow machining was made by mixing viscielastic polymer with alunina and silicon carbide abrasive. Also, we present AFM device design and preliminary results of an investigation in to some aspects of the AFM process performance in fishing trackle reel.

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Effect of Rotating Speed and Air Flow Rate on Material Removal Characteristics in Abrasive Fluidized Bed Machining of Polyacetal (폴리아세탈의 입자유동베드 가공에서 회전속도와 공기 유량이 재료제거 특성에 미치는 영향)

  • Jang, Yangjae;Kim, Taekyoung;Hwang, Heondeok;Seo, Joonyoung;Lee, Dasol;Lee, Hyunseop
    • Tribology and Lubricants
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    • v.33 no.5
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    • pp.214-219
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    • 2017
  • Abrasive fluidized bed machining (AFBM) is similar to general abrasive fluidized machining (AFM) in that it can perform polishing of the outer and inner surfaces of a 3-dimensional shape by the flow of particles. However, in the case of AFM, the shear force generated by the flow of the particles causes material removal, while in AFBM, the abrasive particles are suspended in the chamber to form a bed. AFBM can be used for deburring, polishing, edge contouring, shot peening, and cleaning of mechanical parts. Most studies on AFBM are limited to metals, and research on application of AFBM to plastic materials has not been performed yet. Therefore, in this study, we investigate the effect of rotating speed of the specimen and the air flow rate on the material removal characteristics during AFBM of polyacetal with a horizontal AFBM machine. The material removal rate (MRR) increases linearly with increase of the rotating speed of the main shaft because of the shear force between the particles of the fluidized bed and the rotation of the workpiece. The reduction in surface roughness tends to increase as the rotating speed of the main shaft increases. As the air flow rate increases, the MRR tends to decrease. At a flow rate of 70 L/min or more, the MRR remains almost constant. The reduction of the surface roughness of the specimen is found to decrease with increasing air flow rate.

Experimental study for the process conditions of abrasive jet machining by Taguchi method (Taguchi 실험계획법을 이용한 미세입자 분사가공조건 획득에 관한 연구)

  • 박동진;이인환;고태조;김희술
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.379-382
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    • 2004
  • Abrasive jet machining (AJM) has a large number of parameters such as powder flow rate, air pressure, diameter of abrasive, stand off distance, material hardness and fracture toughness, etc. It is not easy matter to control those parameter. To achieve high accurate machining, in this study, Taguchi method was used to select process parameters. The objective of the optimization was to get higher material removal rate (MRR). From the experiments and analysis, some process parameters were found to make efficient machining.

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A Study of the Effects of Pressure Velocity and Fluid Viscosity in Abrasive Machining Process (입자연마가공에서의 압력 속도 및 유체점도의 영향에 대한 고찰)

  • Yang, Woo-Yul;Yang, Ji-Chul;Sung, In-Ha
    • Tribology and Lubricants
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    • v.27 no.1
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    • pp.7-12
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    • 2011
  • Interest in advanced machining process such as AJM(abrasive jet machining) and CMP(chemical-mechanical polishing) using micro/nano-sized abrasives has been on the increasing demand due to wide use of super alloys, composites, semiconductor and ceramics, which are difficult to or cannot be processed by traditional machining methods. In this paper, the effects of pressure, wafer moving velocity and fluid viscosity were investigated by 2-dimensional finite element analysis method considering slurry fluid flow. From the investigation, it could be found that the simulation results quite corresponded well to the Preston's equation that describes pressure/velocity dependency on material removal. The result also revealed that the stress and corresponding material removal induced by the collision of particle may decrease under relatively high wafer moving speed due to the slurry flow resistance. In addition, the increase in slurry fluid viscosity causes the reduction of material removal rate. It should be noted that the viscosity effect can vary with the shape of abrasive particle.

A Closer Look at the Effect of Particle Shape on Machined Surface at Abrasive Machining (입자연마가공에서의 입자 형상의 영향에 대한 고찰)

  • Kim, Dong-Geun;Sung, In-Ha
    • Tribology and Lubricants
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    • v.26 no.4
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    • pp.219-223
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    • 2010
  • Despite the increasing need of nanometer-scale accuracy in abrasive machining using ultrasmall particles such as abrasive jet and chemical mechanical polishing(CMP), the process mechanism is still unknown. Based on the background, research on the effects of various process parameters on the machined surface at abrasive machining was motivated and performed by using finite element analysis where the effect of slurry fluid flow involved. The effect of particle shape on the machined surface during particle-surface collision was discussed in this paper. The results from FEA simulation revealed that any damage or defect generation on machined surface by the impact may occur only if the particle has enough impact energy. Therefore, it could be concluded that generation of the defects and damage on the wafer surface after CMP process was mainly due to direct contact of the 3 bodies, i.e., pad-particle-wafer.

The Internal Finishing Characteristics of Pipe Polished by Slurry Circulation Magnetic Abrasive Machining (슬러리순환 자기연마법에 의한 파이프 내면의 연마특성)

  • Rho, T.W.;Park, W.K.;You, W.S.;Seo, Y.I.;Choi, H.;Lee, J.C.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.198-201
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    • 2002
  • An internal finishing process by the application of magnetic abrasive machining has been developed as a new technology to obtain a fine inner surface of pipe. In this paper, a slurry circulation system was designed and manufactured. Its finishing characteristics was experimently investigated by various effective factors such as dry, water flow, oil flow with a slurry. From the experimental results, it was found that the materal removal and surface roughness were good in oil flow with slurry. The slurry circulation system is effective on the internal finishing of non-ferromagnetic pipe(SUS304).

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Fabrication of Micro Structure Using Photo Polymer Mask and Micro Abrasive Jet Machining (Photo Polymer 마스크와 미세입자분사가공을 이용한 미세구조물 제작)

  • Ko T.J.;Park D.J.;Lee I.H.;Kim H.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.1175-1178
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    • 2005
  • Brittle materials, especially single-crystal silicon wafer, are widely used for sensors, IC industry, and MEMS applications. e general machining process of crack easy materials is by chemical agents, but it is hazardous and time consuming. Also, it is difficult to get high aspect ratio micro structure. As an alternative tool, an AJM(Abrasive jet machining) is promising method in terms of high aspect ratio and production cost. In this study, to get more precise detail compared to general AJM, photo polymer mask, SU-8, used in photolithography was applied in AJM. Process parameters such as abrasive diameter, air pressure, nozzle diameter, flow rate of abrasive in AJM and a variety of conditions in spin coating were decided. Finally, micro channel and mixer was fabricated to see the efficiency of the AJM with photo polymer mask.

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