• Title, Summary, Keyword: Surface Deformation

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A Study on the Thermal Deformation of a Cutting Tool in End Milling (엔드밀 작업에서 공구의 열변형에 관한 연구)

  • 홍민성
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.97.2-101
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    • 1998
  • Machining process introduces thermal deformation of a cutter, which affects the surface finish of the workpieces. By measuring the temperature distribution of the cutter, thermal stress and deformation of the cutter are simulated. In addition, surface roughness of workpiece is simulated by the surface-shaping system. The result shows that thermal deformation deteriorates the surface roughness.

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A Study on the Thermal Deformation of a Cutting Tool in End Milling (엔드밀 작업에서 공구의 열변형에 관한 연구)

  • 홍민성
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.8 no.5
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    • pp.25-29
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    • 1999
  • Machining process introduces thermal deformation of a cutter which affects the surface finish of the workpieces. By measuring the temperature distribution f the cutter thermal stress and deformation of the cutter are simulated. In addition surface roughness of workpiece is simulated by the surface-shaping system. The result shows that thermal deformation deteriorates the surface roughness.

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Influence of Surface Roughness Change on Frictional Behavior of Sheet Steel for Each Forming Mode (소성변형에 의한 냉연 강판의 표면 거칠기 변화가 마찰 특성에 미치는 영향)

  • Han, S.S.
    • Transactions of Materials Processing
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    • v.19 no.4
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    • pp.236-241
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    • 2010
  • The frictional behavior of bare steel sheet highly depends on surface roughness. It was investigated that the change of surface roughness of bare steel sheet due to deformation for each forming mode. The flat type friction test was done to check the effect of surface roughness change on frictional characteristics of bare steel sheet. As increasing the deformation, the Ra value was increased at stretching forming mode and drawing forming mode, however the change of Pc showed different trends. The Pc was decreased as increasing stretch deformation but increased at compression deformation. At drawing forming mode, the friction coefficient was increased as deformation was increased after initial big drop with drawing oil. As deformation was increased, the friction coefficient was decreased with drawing oil at stretching forming mode. The results show that the deformation changes the surface roughness and frictional characteristics of steel sheet but the effect depends on the forming mode.

Bond Performance of FRP Reinforcing Bar by Geometric Surface Change (콘크리트 보강용 FRP 보강근의 표면형상 변화에 따른 부착 특성)

  • Park, Chan-Gi;Won, Jong-Pil
    • Journal of The Korean Society of Agricultural Engineers
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    • v.46 no.5
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    • pp.69-77
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    • 2004
  • FRP rebar has low bond performance than steel rebar. Usually, FRP rebar has about 60% of bond strength of steel rebar. Without adequate bond to concrete, the full composite action between reinforcement and concrete matrix can not be achieved. Therefore, FRP rebars must also have surface deformations that provide good bond to concrete. The purpose of this research was decided an optimum surface deformation patterns through bond test of FRP rebar. Eighteen surface deformation patterns of FRP rebar with widely different geometries were investigated. Based on the test results, we established optimum surfale deformation pattern. Bond tests were performed for three types of surface deformation patterns of FRP rebar including sand coated rebar, ribbed rebar, and wrapped and sand coated rebar that commercially available, and two types of FRP rebar including CFRP, GFRP rebars that optimum surface deformation pattern is applied. According to bond test results, FRP rebars that optimum surface deformation pattern is applied were found to have better bond strength with concrete than currently using FRP rebar.

Shape deformation and wear sensation in wearing on support type panty stocking (고탄력 팬티스타킹 착용에 의한 형태변형 및 착용감)

  • 류현혜;성수광
    • Journal of the Ergonomics Society of Korea
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    • v.14 no.1
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    • pp.37-57
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    • 1995
  • The purpose of this study was to investigate the elastic effect of deformation and restriction in wearing a support type panty stocking (PS). The study investigated deformation rate in all surface area, deformation rate in local area, length deformation rate, changes in slip and feeling of restriction under the standard laboratory condition. Two healthy adult females in twenties wore four types of PS. The result were as follows : The deformation rate in all surface area was 117 .approx. 132% in wearing support type PS, 157% in wearing mono type PS, due to the intensities of restriction. The deformation rate in local area was in order, course > oblique > wale direction. The largest deformation rate was observed in hip girth. Between the deformation rates in all surface and local areas was a high correlation acknowledged, especially the course direction showed a high correlation. Support type PSs showed more deformation and changes of slip than wool and mono type PS. Especially, changes of slip at the knee appeared greatly. The responses of restriction evaluated from a paired comparison method were in order, JS 2 > KS 4 > KS 9 > KS 5 > KS 1 > KM 3.

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A Comparison of the Fuzzy Display Methods for a Surface Deformation

  • Park, Min-Kee
    • Journal of IKEEE
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    • v.17 no.2
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    • pp.151-158
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    • 2013
  • There are several kind of surface deformation display methods using the fuzzy model. In this paper, we describe three fuzzy display methods for a surface deformation and perform a comparative analysis between the modified fuzzy display method and some conventional fuzzy display methods. In each method, the analysis will be performed through computer simulation in order to show the performance of each algorithm. The results show that the modified method have improved the realism and can be used better than the conventional methods in practical applications.

A Study on the Effect of Tool Thermal Deformation on Surface Roughness for Turning Process

  • Hong, Min-Sung;Lian, Zhe-Man;Kim, Dong-Joon
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.262-267
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    • 2000
  • During the turning of the workpiece, cutting heat causes thermal deformation of the cutting tool which influences the surface characteristics of the machined part. This paper presents a study of thermal deformation of the cutting tool. For this purpose, cutting tool is modeled based on Pro/Engineering and temperature and deformation are simulated by means of the finite element method. The thermal effect on the surface roughness profile is simulated by using surface-shaping system.

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A Study on the Prediction of Thermal Deformation Using Temperature Analysis in Surface Grinding Process (연삭가공시 온도해석을 통한 열변형 예측)

  • 김강석;곽재섭;송지복
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.19-23
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    • 1995
  • The thermal deformation of a workpiece during grinding is one of the most important factors that affect a flatness of a grinding surface. The heat generated in one-pass surface grinding causes the convex deformation of a workpiece. Therefore, the ground durfae represents a concave profile. In the analysis a simple model of the temperature distribution, based on the results of a finite element method, is applied. Theanalyzed results are compared with experimental results in surface grinding. The main results obtained are as follows: (1) The temperature distribution of a workpiece by FEM has a good agreement with the experimental results. (2) The bending moment by generated heat causes a convex deformation of the workpiece and it leads to a concave profile of the grinding surface.

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A Study on the Effect of Tool Thermal Deformation on Surface Profiles for Turing Process (선삭에서 공구열변형이 표면 형상에 미치는 영향에 관한 연구)

  • 염철만;신근하;홍민성
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.10 no.4
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    • pp.33-39
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    • 2001
  • During the turning of the workpiece, cutting heat causes thermal deformation of the cutting tool which influences the surface characteristics of the machined part. This paper presents a study of thermal deformation of the cutting tool. For this purpose, cutting tool is modeled based of Pro/Engineering and the thermal deformation is simulated by means of the finite element method. The thermal effect on the surface roughness profile is simulated by using surface-shaping system. It has been shown that the results of simulation are similar to those of experiment.

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Uniform Scallop Height Tool Path Generation Using CL Surface Deformation (CL면 변형 방법을 이용한 균일한 조도의 공구 경로 생성)

  • Yang Min-Yang;Kim Su-Jin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.6
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    • pp.895-903
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    • 2005
  • In this paper, we present a cutter location (CL) surface deformation approach for constant scallop height tool path generation from triangular mesh. The triangular mesh model of the stereo lithography (STL) format is offset to the CL surface and then deformed in accordance with the deformation vectors, which are computed by the slope and the curvature of the CL surface. In addition, the tool path which is computed by slicing the deformed CL surface is inversely deformed by those same deformation vectors to a tool path with a constant scallop height. The proposed method is implemented, and a tool path generated by the proposed method is tested by simulation and by numerical control (NC) machining. The scallop height was found to be constant over the entire machined surface, demonstrating much better quality than that of mesh slicing, under the same constraints for machining time.